End mill is provided with outer periphery cutting edges and end cutting edges along spiral flutes. Spiral flutes include first and second flutes. Flute bottom of first flute is with linear portion, R-shaped portion, and gradient portion. The linear portion extends in parallel to axis line O and in straight-line shape, from tool distal end toward rear end side to position separated from the tool distal end by length corresponding to tool outer diameter. The gradient portion is provided to the rear end side, and is inclined straightly toward outer side in radial direction toward the rear end side. The R-shaped portion connects rear end of the linear portion and front end of the gradient portion, and is curved in circular arc shape toward the outer side in the radial direction. Rake angles of the outer periphery and end cutting edges are constant over entire periphery.
Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compared with cutting of a curved surface with linear cutting edges, surface roughness of a machined surface can be improved by cutting a curved surface with the respective large diameter edges. Accordingly, a pick feed during the cutting of the planar surface and the curved surface with the respective large diameter edges can be increased, and therefore machining efficiency in the cutting of both of the planar surface and the curved surface can be improved.
Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compared with cutting of a curved surface with linear cutting edges, surface roughness of a machined surface can be improved by cutting a curved surface with the respective large diameter edges. Accordingly, a pick feed during the cutting of the planar surface and the curved surface with the respective large diameter edges can be increased, and therefore machining efficiency in the cutting of both of the planar surface and the curved surface can be improved.
Provided is a gear chamfering method with which the axial-direction edge part of the tooth surface of each tooth of a gear can be chamfered in a short amount of time. This gear chamfering method comprises a chamfering step in which edge parts 15b, 15c of a plurality of teeth 12 of a gear 10 are chamfered by a chamfering tool 20 equipped with a machining blade 24. If a discretionary integer is represented as K, the number of teeth 12 is represented as Zw, and the number of machining blades 24 is represented as Zt, then in the chamfering step, the gear 10 is rotated by K・Zt/Zw around a rotation axis C1 every time the chamfering tool 20 is rotated once around a tool axis C2 in a machining posture in which the tool axis C2 is disposed non-parallel to the rotation axis C1. Due to this configuration, the machining blade 24 sequentially contacts the plurality of edge parts 15b, 15c, and the edge parts 15b, 15c are chamfered.
A hard coating includes first and second layers. The first layer is constituted by AlaCrbαcN, wherein atomic ratios a, b, c satisfy a+b+c=1, 0≤c≤0.40 and 0.25≤b/a≤1.0, and an optional additive component α is at least one kind of element selected from groups IVa, Va and VIa (except Cr) and Y of periodic table of elements. The second layer is constituted by AldCreCfN, wherein atomic ratios d, e, f satisfy d+e+f=1, 0.001≤f≤0.20 and 0.25≤ e/d≤1.0. A total thickness T of a thickness T1 of the first layer and a thickness T2 of the second layer is 0.5-9.0 μm. A ratio of the thickness T2 to the total thickness T is 5-50%. The hard coating has peaks belonging to (111) and (200) planes in an X-ray diffraction, such that an intensity ratio of a peak intensity SP1 of the (111) plane to a peak intensity SP2 of the (200) plane is 0.1-20.
A drill includes a drill main body to be rotated around a shaft center, discharge flutes provided in a helical shape in an outer peripheral surface, a cutting edge formed at a ridge section between an inner face, of the discharge flute, and a flank of the drill main body at a leading end portion, a thinning edge provided at the leading end portion of the drill main body, a thinning face being a rake face of the thinning edge, and connecting the thinning edge with the discharge flute, and a gash portion connected to the thinning face, a ridge line between the gash portion and the flank extending in a circular arc shape from an inner end of the thinning edge, and being connected to the discharge flute. The gash portion is connected to the discharge flute while twisting along a helix angle of the discharge flute.
A drill is provided with a flank at a leading end portion of a body. An oil hole is provided at the flank, having a fan-shaped cross-section. The fan-shaped cross-section is formed by being surrounded by a front-side inner wall surface, a rear-side inner wall surface, an outer peripheral-side inner wall surface, and an inner peripheral-side inner wall surface. Compared to a round hole, a discharge performance of cutting fluid of the oil hole is high. The rear-side inner wall surface curves in a circular arc shape toward the front in a rotation direction. Thus, the drill can secure a distance between a ridge section of the flank and the rear-side inner wall surface to be wide, can suppress stress acting on a section between the ridge section of the flank and the oil hole, and can thus increase a discharge amount of the cutting fluid and also secure a tool rigidity.
This cutting tool includes a base material which is a sintered object consisting mainly of tungsten carbide. The base material contains silicon carbide instead of cobalt. The outer surface of the base material has a diamond layer formed thereon which is made of polycrystalline diamond. Since the base material contains no cobalt, the base material neither inhibits synthesis of the diamond layer on the outer surface thereof nor reduces adhesion between the base material and the diamond layer. Thus, a high-hardness diamond layer tightly adhering to the outer surface of the base material can be formed and the cutting tool can hence have further improved durability.
This cutting tool comprises a base material which is a sintered body mainly composed of tungsten carbide. The base material does not contain a binder. A diamond layer is formed on the outer surface of the base material. Because the base material does not contain a binder, the formation of the diamond layer on the outer surface of the base material is not hindered, and the adhesion between the base material and the diamond layer is not reduced. Due to this configuration, the cutting tool is configured so that a high-hardness diamond layer can be formed in a highly adherent manner on the outer surface of the base material, and as a result thereof, durability can be further improved.
A drill (1) is provided with a thinning edge (7), a gash portion (8), a coolant passage, and an oil hole (12). The thinning edge (7) is provided at a leading end portion of a body (3), and extends toward a chisel portion (9) from an inner end (51) of a cutting edge (5). A ridge line between the gash portion (8) and the flank (6) extends in a circular arc shape from an inner end of the thinning edge (7) toward an outer peripheral surface (31) of the body (3). The coolant passage is provided inside a shank and the body (3), and extends from a rear end portion of the shank toward the leading end portion of the body (3). The oil hole (12) is provided at a gash face (81) of the gash portion (8) and is an outlet of the coolant passage.
This drilling tool comprises a core material and an outer material located around the core material, wherein, when viewed in a longitudinal direction from a tip end side, the outer material has formed therein an integral hole including an insertion region through which the core material is inserted, and an oil hole region communicating with the insertion region, and an oil hole is defined by an outer periphery of the core material inserted into the insertion region, and an edge of the oil hole region of the outer material.
An end mill that facilitates discharge of chips and enables twining of chips to be suppressed is provided. An end mill (10) includes a tool body, a helical flute, an end cutting edge, a flank, and a gash. The gash forms a cutting face of the end cutting edge. The cutting face is formed as a recessed curved surface and the end cutting edge comprised of a ridge between the cutting face and the flank is concavely curved.
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps; metalworking machines and tools, namely, drills; metalworking machines and tools, namely, drill bits; steel taps being parts of high-speed tools for metalworking; steel drills being parts of high-speed tools for metalworking; steel drill bits being parts of high-speed tools for metalworking; cemented carbide tools for metalworking; cemented carbide cutting tools; cemented carbide taps for metalworking; cemented carbide drills for metalworking; cemented carbide drill bits for metalworking; wear resistant tools for metalworking. (1) Metalworking; treatment of materials for the manufacture of ceramic goods; coating and surface finishing of machines and tools.
Provided is a thread mill that can extend tool life-span by reducing the stripping of a female thread being processed. This thread mill (10) comprises: a plurality of threading edges (20a, 24, 29) which are disposed, apart from each other by an interval in a circumferential direction, on a leading end (14) side of the outer circumference of a tool body (12); and a plurality of end cutting edges formed at the leading end (14) of the tool body 12. Each of the end cutting edges has formed therein: a functional edge part (35) that is for cutting an object being processed; and a non-functional edge part (36) that is relieved toward a shank end (13) side in the axial direction with respect to a trajectory of the functional edge part (35) obtained when the tool body (12) is rotated one revolution about the shaft center (C) thereof.
A method of producing a nitrided cut tap that includes a nitrogen diffusion layer. The method includes (a) a nitriding step for forming the nitrogen diffusion layer in which nitrogen atoms contained in an atmospheric gas are diffused from a surface of a base material of the cut tap under heat, such that the nitrogen diffusion layer has a thickness ranging from 10 μm to 30 μm; and (b) a honing step for rounding a cutting edge portion by colliding abrasive particles against a local part of the cutting edge portion of the base material of the cut tap that has been subjected to the nitriding step, such that a difference between a thickness of the nitrogen diffusion layer in the cutting edge portion and a thickness of the nitrogen diffusion layer in flank and rake surfaces sandwiching the cutting edge portion, is not larger than 5 μm.
B23P 15/52 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools threading tools taps
An end mill includes a plurality of peripheral cutting edges having a cutting diameter that is constant over their entire cutting length. The plurality of peripheral cutting edges, which are adjacent to each other, are defined by curved teeth. Each of the curved teeth is twisted in a twist direction that is changed irreversibly and smoothly from one of rightward and leftward directions to the other of the rightward and leftward directions in the entire cutting length so as to be reversed right and left on its way. Each of the curved teeth has a curved shape curved in an arcuate or arched manner in a development view of an outer circumferential surface of the end mill around an axis such that a corresponding one of the peripheral cutting edges is provided on a concave side of the curved shape.
An end mill includes a plurality of peripheral cutting edges that are defined by three types of teeth including a right-handed helical tooth that is twisted rightward, a left-handed helical tooth that is twisted leftward, and a curved tooth which is twisted in a direction reversed right and left on a way thereof and which has a curved shape curved in an arcuate or arched manner in a development view of an outer circumferential surface of the end mill around an axis such that a corresponding one of the peripheral cutting edges is provided on a concave side of the curved shape. Each adjacent pair of the peripheral cutting edges adjacent to each other are defined by the respective teeth that are different in type from each other.
A thread forming tap (1) comprises a male thread (3), a groove, and an inner-diameter finishing tooth (61). A lead-in section (31) of the male thread (3) is provided so as to be continuous with a complete thread section (32) and decreases in diameter toward the tip. The groove is provided parallel to the axis across the complete thread section (32) and the lead-in section (31) so as to divide the thread ridges (71) of the male thread (3). The inner-diameter finishing tooth (61) is provided along the open end of the groove on the opposite side from the direction of rotation of the thread forming tap (1) in the lead-in section (31) and the complete thread section (32). The inner-diameter finishing tooth (61) shaves and removes the top part of the thread ridges of a female thread formed in a surface layer of a pilot hole (90). The height of a first-stage finishing tooth (611) of the inner-diameter finishing tooth (61) in the lead-in section (31) is lower than the height of a second-stage finishing tooth (612) of the inner-diameter finishing tooth (61) formed in a part corresponding to the thread ridge (71) at the leading edge in the complete thread section (32).
Metalworking machine tools; machine tools for cutting and forming of metal materials; taps being machine tools; high-speed steel taps being machine tools; wear resistant tools for machine tools
An end mill includes a plurality of peripheral cutting edges have respective helix angles which are equal to each other and which range from 0° to 5°. Each of the plurality of peripheral cutting edges is defined by one of four types of teeth A-D consisting of (a) teeth A-C each defining a partially-uneven cutting edge that includes an uneven edge portion consisting of a nicked portion or a roughing portion and (b) a tooth D that does not define the uneven edge portion. The peripheral cutting edges are defined by at least two of the four types of teeth A-D, such that each adjacent pair of the peripheral cutting edges adjacent to each other are defined by the teeth that are different in type from each other.
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps; steel taps being parts of high-speed tools for metalworking; wear resistant tools for metalworking.
NATIONAL UNIVERSITY CORPORATION TOYOHASHI UNIVERSITY OF TECHNOLOGY (Japan)
OSG CORPORATION (Japan)
Inventor
Takikawa Hirofumi
Bando Takahiro
Saiki Yoshinori
Kito Jumpei
Hashimoto Yuki
Sugita Hiroaki
Gima Hiroki
Abstract
[Problem] To provide a film-forming device in which an anode part provided with a function for generating a magnetic field is positioned between a cathode part and an object being processed, whereby it is possible to reduce adhesion of particles emitted from a cathode to a magnetic-field-generating part and to efficiently form a vapor-deposited film having few droplets, which are by-product fine particles emitted from the cathode. [Solution] A film-forming device that evaporates a cathode material constituting a cathode using a plasma-generating means for generating plasma by performing arc discharge to form a film by vapor deposition on the surface of an object being processed. The plasma-generating means is provided with a cathode part, an anode part disposed a suitable distance from the cathode part, a magnetic-field-generating part, and a protective member. The magnetic-field-generating part is configured from the anode part or is configured integrally or continuously with the anode part and generates a magnetic field using a current produced through arc discharge. The protective member is configured from a portion of the anode part or is configured independently while being electrically connected to the anode part and is positioned outside a region where the plasma flow descends to protect all or part of the magnetic-field-generating part from adhesion of cathode material.
Provided is a rolling die that increases the durability of a nitrided molded surface. The rolling die (1) includes a tool base material that is made of steel and has a molded surface (2) on which a plurality of working teeth (10) is formed. The tool base material includes a nitride layer (15) in which nitrogen is diffused. The nitride layer (15) is disposed to reach a position that is 20 to 70 μm in depth from the molded surface (2). The molded surface (2) has a surface hardness of at least 1100 HV. The rate of depth change from the depth (D1) of the nitride layer (15) at crests (11) of the working teeth (10) to the depth (D2) of the nitride layer (15) at roots (13) of the working teeth (10) is not higher than 30%.
C23C 22/62 - Treatment of iron or alloys based thereon
C23C 28/04 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and only coatings of inorganic non-metallic material
Provided is a diamond-coated body comprising: a substrate that is formed from a material having a larger thermal expansion coefficient than diamond and that has a surface region extending in a first direction and a second direction which are mutually intersecting; a plurality of grooves in the surface region of the substrate, the grooves extending in the first direction and being spaced from each other in the second direction; and a coating layer that includes diamond as a constituting material and that covers the surface region of the substrate and the grooves; and a low density section which is formed on the bottom portion of each of the grooves and for which the density of diamond is lower than that of the coating layer.
This ball end mill comprises a ball blade part formed in a partially spherical shape, and when viewed from a rotational axis direction from the distal end, the ball blade part has at least one first groove in a first torsion form and a plurality of second grooves in a second torsion form, the first and second grooves extending from the distal end side of the ball blade part to the outer peripheral side. When, in one of the second grooves, an intersecting portion, located at a prescribed position from the distal end side, among intersecting portions intersecting the at least one first groove is defined as a first intersecting portion and, in another of the second grooves, an intersecting portion, located at the prescribed position from the distal end side, among the intersecting portions intersecting the at least one first groove is defined as a second intersecting portion, the length from the distal end to the first intersecting portion is different than the length from the distal end to the second intersecting portion.
Provided is a ball end mill comprising a ball blade formed in a partially spherical shape. The ball blade includes a plurality of grooves, including grooves having a first twisted shape and grooves having a second twisted shape different from the first twisted shape, such grooves extending from the leading end side of the ball blade towards the outer-circumferential side, when viewed in the rotational axis direction from the leading end. The plurality of grooves are non-connected at the leading end.
Metalworking machine tools; taps being machine tools; power drills; thread milling cutters being machine tools; turning point tools being machine tools; milling cutters for milling machines; reamers being machine tools; cemented carbide tools being machine tools; cemented carbide cutting tools; anti- abrasive cemented carbide cutting tools; cemented carbide tips; wear-resistant machine tools, namely, milling cutters; power tools, namely, end mills; power drill bits; power drill bits with a cooling hole
This end mill comprises a peripheral cutting edge along a helical flute, and a bottom cutting edge. The helical flute comprises a first flute (21) and a second flute (22). A flute bottom of the first flute (21) comprises a straight portion (41), a radiused portion (42), and an inclined portion (43). The straight portion (41) extends linearly in parallel with an axis O from the tip of the tool toward the rear end side to a position distanced by the length of an outer diameter of the tool. The inclined portion (43) is provided on the rear end side of the straight portion (41), and is linearly inclined radially outward from the straight portion (41) side toward the rear end side. The radiused portion (42) connects a rear end of the straight portion (41) and a front end of the inclined portion (43), and curves radially outward arcuately from the straight portion (41) side toward the inclined portion (43) side. The rake angles of the peripheral cutting edge and the bottom cutting edge are constant over the entire circumference.
A ballscrew thread forming tap including a complete thread portion and a leading portion is to be screwed into a prepared hole provided in a workpiece so as to cause an inner circumferential surface of the prepared hole to be plastically deformed for thereby forming a ballscrew thread corresponding to an external thread provided in the complete thread portion. A screw thread of the external thread has a leading flank and a trailing flank, which are to be positioned on a front side of the trailing flank and on a rear side of the leading flank, respectively, when the ballscrew thread forming tap is screwed into the prepared hole. The screw thread is formed such that, in the leading portion, an indentation depth into the workpiece made by the leading flank is smaller than an indentation depth into the workpiece made by the trailing flank.
This hard coating 32 comprises: a first layer 34 provided on the surface of a base material 30; and a second layer 36 provided on the surface of the first layer 34. The first layer 34 is composed of AlCrαN, and the second layer 36 is composed of AlCrCN. In addition, the overall film thickness T, which is the total of the film thickness T1 of the first layer 34 and the film thickness T2 of the second layer 36, falls within a range of 0.5-9.0 μm. The proportion (T2/T) of the film thickness T2 of the second layer 36 with respect to the overall film thickness T falls within a range of 5-50%. Furthermore, the hard coating exhibits X-ray diffraction peaks including peaks that are attributed to the (111) plane and (200) plane. The peak intensity ratio (SP1/SP2) of the peak intensity SP1 of the (111) plane to the peak intensity SP2 of the (200) plane falls within a range of 0.1-20. With the hard coating 32 thus configured, it is possible to achieve excellent durability.
Provided is an end mill with which swarf can easily be discharged, and with which winding of swarf can be suppressed. An end mill (10) is provided with a columnar tool main body (11) which is rotated about an axis (O), serving as an axis of rotation, twisted flutes (12) which are recessed and which twist around the axis on an outer circumference of the tool main body, base cutting edges (16a to 16c) formed in a tip end portion of the tool main body, flanks (17a to 17c) extending in the circumferential direction from the base cutting edges, and gashes (18a to 18c) which are recessed on tip end sides of the twisted flutes, from an outer circumferential side toward the axis, and which form rake faces (19a to 19c) of the base cutting edges, wherein: the rake faces are formed as concave curved surfaces; and the base cutting edges, which comprise ridge lines between the rake faces and the flanks, have a concave curved shape.
A drill body of a drill (1) is to rotate around an axis. A plurality of discharge grooves (4) are spirally provided in an outer circumferential surface (31) of the drill body from a tip end part toward a base end part. Cutting edges (5) are formed at ridge portions between inner surfaces of the discharge grooves (4) that face the rotational direction side of the drill body and flank surfaces of the tip end part of the drill body. Thinning edges (7) extend at the tip end part of the drill body from inner ends of the cutting edges (5) toward a chisel (9) that is a tip end portion of the drill body. Thinning surfaces (71) that are rake surfaces of the thinning edges (7) connect the thinning edges (7) and the discharge grooves (4). Gash parts (8) are connected to the thinning surfaces (71), extend in an arc from inner ends of the thinning edges (7) at ridges with the flank surfaces, and are connected to the discharge grooves (4). The gash parts (8) are connected to the discharge grooves (4) so as to twist along the angle of twist of the discharge grooves (4).
A method for chamfering toothed gears which enables lengthening of a life of a tool is provided. The chamfering method is for sequentially chamfering the line intersection portions 23 between tooth flanks 21 and end faces 22 of teeth 2 with end cutting edges 122. A pitch Pb of the end cutting edges 122 is set to five times a pitch Fa of the teeth 2. As a result, at a chamfering step of chamfering line intersection portions 23 of the teeth 2, a circumferential speed of the end cutting edges 122 can be made faster than a circumferential speed of the teeth 2. Consequently, a difference in circumferential speed between the end cutting edges 122 and the teeth 2 can be utilized in chamfering and thus a cutting resistance can be reduced during the chamfering. Therefore, a life of the tool 100 can be lengthened.
A thread forming tap including a complete thread portion and a leading portion is to be screwed into a prepared hole provided in a workpiece so as to cause an inner circumferential surface of the prepared hole to be plastically deformed for thereby forming an internal thread corresponding to the external thread provided in the complete thread portion. A screw thread of the external thread has a leading flank and a trailing flank, which are to be positioned on a front side of the trailing flank and on a rear side of the leading flank, respectively, when the thread forming tap is screwed into the prepared hole. The screw thread is shaped such that, in the leading portion, an indentation depth into the workpiece made by the leading flank is smaller than an indentation depth into the workpiece made by the trailing flank.
A drill (1) is provided with a flank on a tip end portion of a body (3). The flank is provided with an oil hole (12). The oil hole (12) has a fan-shaped cross section. The fan-shaped cross section is formed by being surrounded by a leading-side inner wall surface (121), a trailing-side inner wall surface (122), an outer circumference-side inner wall surface (123), and an inner circumference-side inner wall surface (124). The oil hole (12) has better capacity of discharging cutting fluid than that of a circular hole. The trailing-side inner wall surface (122) is curved in an arc shape toward the leading side in a rotation direction (T). Thus, in the drill (1), the distance between a ridge portion of the flank and the trailing-side inner wall surface (122) can be ensured to be wide. The drill (1) can suppress stress acting on a portion between the ridge portion of the flank and the oil hole (12) and can thus increase the discharge amount of the cutting fluid while ensuring tool rigidity.
A drill (1) is provided with thinning edges (7), gash sections (8), coolant passages, and oil holes (12). The thinning edges (7) are provided at the distal-end part of a body (3), and extend from inner ends (51) of cutting edges (5) to chisel sections (9). In the gash sections (8), ridgelines formed with flanks (6) extend in an arc shape from the inner ends of the thinning edges (7) toward outer circumferential faces (31) of the body (3). The coolant passages are provided inside a shank and the body (3), and extend from the rear end part of the shank to the distal-end part of the body (3). The oil holes (12) are provided in gash faces (81) of the gash sections (8), and are outlets of the coolant passages.
A drill (1) is provided with a flank on a tip end portion of a body (3). The flank is provided with an oil hole (12). The oil hole (12) has a fan-shaped cross section. The fan-shaped cross section is formed by being surrounded by a leading-side inner wall surface (121), a trailing-side inner wall surface (122), an outer circumference-side inner wall surface (123), and an inner circumference-side inner wall surface (124). The oil hole (12) has better capacity of discharging cutting fluid than that of a circular hole. The trailing-side inner wall surface (122) is curved in an arc shape toward the leading side in a rotation direction (T). Thus, in the drill (1), the distance between a ridge portion of the flank and the trailing-side inner wall surface (122) can be ensured to be wide. The drill (1) can suppress stress acting on a portion between the ridge portion of the flank and the oil hole (12) and can thus increase the discharge amount of the cutting fluid while ensuring tool rigidity.
A drill (1) is provided with a body (10) and a head (30). The body (10) is formed of cemented carbide, and the head (30) is formed of PCD. Spiral coolant passages (17, 18) are provided inside the body (10). Oil holes (25, 26) are provided in a body-side joint surface of the body (10). The oil holes (25, 26) are outlets of the coolant passages (17, 18). Coolant passages (37, 38) provided inside the head (30) extend from oil holes (45, 46) provided at a tip (31) toward a rear end (32). A head-side joint surface of the head (30) is joined to the body-side joint surface. Two oil holes are provided in the head-side joint surface. The two oil holes are inlets of the coolant passages (37, 38), and communicate with the oil holes (25, 26) in the body-side joint surface.
Provided is a highly durable cut tap wherein blade chipping and wearing that occur during tapping have been suppressed. In this invention, in a nitriding step P2, under heating, nitrogen atoms contained in the atmosphere gas are diffused from the surface of a tool parent material for a cut tap, to form a nitrogen diffusion layer, and then, in a honing step P3, abrasive particles are collided against a cutting edge portion of the tool parent material for the cut tap, to round the cutting edge portion and eliminate a blade tip. In the cutting edge portion, due to the diffusion from a flank and the diffusion from a face, the nitrogen diffusion layer is formed to be thick, such that the blade tip of the cutting edge portion is of relatively high nitrogen concentration and hardness, and thus, is mechanically brittle. Therefore, eliminating the mechanically brittle blade tip reduces wearing and blade chipping in the cutting edge portion of the cut tap, yielding a tool performance whereby excellent cutting ability can be held over a long period of time.
B23P 15/52 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools threading tools taps
A rotary cutting tool includes: a blade portion; a shank portion having a diameter larger than a diameter of the blade portion; and a tapered connecting portion connecting the blade portion and the shank portion. The shank portion includes a plurality of coolant-guide recessed grooves provided in its outer circumferential surface. Each of the coolant-guide recessed grooves has a groove depth and a groove width that is larger than the groove depth. Each of the coolant-guide recessed grooves has a groove bottom that is shaped such that the groove depth is reduced as the each of the coolant-guide recessed grooves extends from its start end toward a groove-depth regional-change position in which a tendency of change of the groove depth is changed.
Two or more outer circumferential cutting blades of this end mill are curved blades (circular arc blade A-C) in which respective torsion directions undergo a left-right reversal midway, which have a curved shape when viewed in an expansion plan expanded around a shaft center, and which are each provided with a cutting blade on the recess side of the curved shape. As a result, an anti-vibration effect is obtained through continuous changing of the direction of the cutting force due to change in the torsion angle. In addition, formation of burrs or the like on upper and lower surfaces of a workpiece is suppressed by the curved blades, and restrictions and the like on machining conditions is eased as a result of suppression of accumulation of cutting scraps since a smooth curved shape is formed.
In the present invention, at least one of a plurality of outer-peripheral cutting edges 20a-20c is a relief-pattern-edge-equipped cutting edge in which a relief pattern edge Er formed from a nicked edge or a roughed edge is provided, and the relief pattern edge Er is provided to only a portion of the edge length L of the relief-pattern-edge-equipped cutting edge; therefore, the magnitude of cutting force partially varies depending on the presence of the relief pattern edge Er. Specifically, because the portion where the relief pattern edge Er is provided has lower cutting force, resonance is suppressed due to this difference in cutting force, and chatter vibration occurring due to resonance is suppressed even in an equivalent-lead end mill 10 in which the helix angles of a plurality of outer-peripheral cutting edges 20a-20c are equivalent to each other.
This end mill comprises three types of cutting edge, a curved tooth BS, a left hand helical tooth BL, and a right hand helical tooth BR, as three peripheral cutting edges, adjacent peripheral cutting edges being constituted from different types of cutting edge. Therefore, the spacing between adjacent peripheral cutting edges is irregular and continuously changes in the axial direction, and the direction of cutting force varies. Consequently, resonance is suppressed, and an anti-vibration effect is adequately attained. Moreover, providing the curved tooth BS results in the more adequate suppression of the occurrence of burrs in comparison to when only the right hand helical tooth BR and the left hand helical tooth BL are present, and chatter vibration in the plate thickness direction of a workpiece is reduced as the cutting force acts inward on a curved shape. Furthermore, since the curved tooth BS has a smooth curved shape, the accumulation of chips is reduced, and restrictions on processing conditions are relaxed in comparison to a herringbone shape.
Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compared with cutting of a curved surface with linear cutting edges, surface roughness of a machined surface can be improved by cutting a curved surface with the respective large diameter edges. Accordingly, a pick feed during the cutting of the planar surface and the curved surface with the respective large diameter edges can be increased, and therefore machining efficiency in the cutting of both of the planar surface and the curved surface can be improved.
A hard coating includes a three kinds of layers that are alternately laminated. The three kinds of layers consist of a single composition layer and two kinds of nanolayer-alternated layers. The single composition layer is constituted by one of an A composition (nitride of AlCrSiα), a B composition (nitride of CrBSiβ) and a C composition (nitride of AlCr(SiC)γ). The two kinds of nanolayer-alternated layers include nanolayers which are alternately laminated and which are constituted by two of three combinations consisting of a combination of the A composition and B composition, a combination of the A composition and C composition and a combination of the B composition and C composition. The single composition layer has a thickness of 0.5-1000 nm. Each of the nanolayers constituting the two kinds of nanolayer-alternated layers has a thickness of 0.5-500 nm, and each of the two kinds of nanolayer-alternated layers has a thickness of 1-1000 nm.
B23B 27/14 - Cutting tools of which the bits or tips are of special material
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
C23C 14/32 - Vacuum evaporation by explosionVacuum evaporation by evaporation and subsequent ionisation of the vapours
C23C 28/04 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and only coatings of inorganic non-metallic material
Provided is a method for chamfering gears that is capable of improving the lifespan of a tool. This method is a chamfering method for progressively chamfering, with bottom blades (122), an intersection part (23) between a tooth surface (21) and an end surface (22) of a tooth (2), wherein the pitch (Pb) of the plurality of bottom blades (122) is set to five times the pitch (pa) of the plurality of teeth (2). Accordingly, in a chamfering step for chamfering the intersection part (23) of the tooth (2), it is possible to make the circumferential speed of the bottom blades (122) higher than the circumferential speed of the teeth (2). Therefore, since chamfering can be performed using the difference in the circumferential speed between the bottom blades (122) and the teeth (2), cutting resistance can be reduced during chamfering. Thus, the lifespan of a tool (100) can be improved.
KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION (Japan)
KYUSHU INSTITUTE OF TECHNOLOGY (Japan)
OSG CORPORATION (Japan)
Inventor
Ikenoue, Hiroshi
Yoshitake, Tsuyoshi
Katamune, Yuki
Murasawa, Koki
Abstract
A diamond smoothing method of irradiating a laser light onto a raised and recessed surface of a diamond, so as to smooth the raised and recessed surface, by ablation that is caused to occur in the diamond by irradiation of the laser light onto the raised and recessed surface. The method includes: a threshold-energy-density detecting step of irradiating the laser light onto the raised and recessed surface, and changing an irradiation energy density of the laser light, so as to detect a threshold energy density as a lower threshold value of the irradiation energy density that causes the ablation to occur; and a smoothing processing step of executing a smoothing processing by irradiating the laser light onto the raised and recessed surface with a smoothing irradiation energy density that is set to be within a range from 1 to 15 times as large as the threshold energy density.
C30B 33/00 - After-treatment of single crystals or homogeneous polycrystalline material with defined structure
C30B 33/04 - After-treatment of single crystals or homogeneous polycrystalline material with defined structure using electric or magnetic fields or particle radiation
B23K 103/00 - Materials to be soldered, welded or cut
Provided is a rolling die with a nitrided molding face having increased durability. A rolling die (1) has a molding face (2) on which a plurality of processing teeth (10) are formed, and is made of a steel tool base material. The rolling die (1) has a nitride layer (15) in which nitrogen is dispersed in the tool base material and which is provided to a position of 20-70 µm in depth from the molding face (20). The surface hardness of the molding face (2) is at least 1100 HV. The ratio of change of a depth (D2) of the nitride layer (15) at a valley bottom (13) of the processing teeth (10) to a depth (D1) of the nitride layer (15) at a peak (11) of the processing teeth (10) is no greater than 30%.
A hard coating includes three kinds of alternately laminated layers. The three kinds of layers consist of two kinds of single composition layers and a nanolayer-alternated layer. The two kinds of single composition layers are constituted by respective two of an A composition, a B composition and a C composition, wherein the A composition is a nitride of AlCrα, the B composition is a nitride of AlCrSiβ, and the C composition is a nitride of AlCr(SiC)γ. The nanolayer-alternated layer includes two kinds of nanolayers which are constituted by respective two of the A composition, the B composition and the C composition and which are alternately laminated. Each of the two kinds of single composition layers has a thickness of 0.5-1000 nm. Each of the two kinds of nanolayers has a thickness of 0.5-500 nm, and the nanolayer-alternated layer has a thickness of 1-1000 nm.
B23B 27/14 - Cutting tools of which the bits or tips are of special material
C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
C23C 14/32 - Vacuum evaporation by explosionVacuum evaporation by evaporation and subsequent ionisation of the vapours
C23C 28/04 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and only coatings of inorganic non-metallic material
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
A tapered end mill includes an outer circumferential cutting edge, a flute is disposed such that a flute bottom radius defined as a distance between a flute bottom and the tool axis decreases from a shank side toward the tool tip side, the flute bottom radius linearly changes at a predetermined gradient angle in the tool axis direction, the gradient angle changes at a predetermined change point to become smaller on the tool tip side as compared to the shank side, and a gradient angle θ1 on the tool tip side relative to the change point is equal to or larger than 0° and smaller than a taper half angle α of a cutting portion provided with the outer circumferential cutting edge, and a gradient angle θ2 on the shank side relative to the change point is larger than the taper half angle α.
A step drill and a manufacturing method for a step drill in which cutting performance of a cutting edge of a step portion can be enhanced are provided. A groove includes a first ground portion forming an area embracing a second cutting edge of the step portion and a second ground portion forming an area on the heel side of the step portion relative to the first ground portion. Therefore, a convex blade part can be formed on a first cutting edge by performing grinding with the first ground portion and the second ground portion intersecting with each other. That is, it is possible to form the second cutting edge into a desired shape during grinding of the first ground portion. Therefore, cutting performance of the second cutting edge can be enhanced.
A three-flute drill includes a body, discharge grooves, cutting edges, thinning edges and gash portions. The discharge grooves are provided in an outer peripheral surface of the body. The cutting edges are provided on ridge sections between inner faces of the discharge grooves and flanks of the body. The thinning edge extends from an end of the cutting edge toward a radially inner side. The gash portion includes an R portion and a straight portion. A first ridge line between the R portion and the flank extends while curving toward a rotation direction, from an end of the thinning edge toward a radially outer side. A second ridge line between the straight portion and the flank extends linearly from an end of the first ridge line toward the radially outer side, and connects to the discharge groove further to the radially inner side than the outer peripheral surface.
A thread forming tap 10 for a ball screw, the thread forming tap 10 being formed so that: a thread crest 18 of a biting part is provided with an advancing-side flank surface 18a that serves as a front leading side when screwed into a pilot hole, and a trailing-side flank surface 18b that serves as a rear side in the same situation; and in the biting part, the indentation depth Da of the leading-side flank surface 18a of the thread crest 18 with respect to an article 40 being processed is less than the indentation depth Db of the trailing-side flank surface 18b of the thread crest 18 with respect to the article 40 being processed. Due to this configuration, a counterforce Fa from the article 40 being processed that is applied to the leading-side flank surface 18a in order to plastically deform the article 40 being processed is less than a counterforce Fb from the article 40 being processed that is applied to the trailing-side flank surface 18b during a tapping process. Therefore, pressure and friction with respect to the leading-side flank surface 18a are suppressed during the tapping process, and a highly precise ball screw is obtained.
The present invention suppresses a reduction in durability and tool longevity by suppressing pressure on an advancing-side flank face during tapping machining. Provided is a thread forming tap wherein a screw thread 18 on a chamfer comprises an advancing-side flank face 18a, which is the advancing side thereof when screwed into a pilot hole in a workpiece 40, and a following-side flank face 18b, which is the back side, and on the chamfer, the indentation depth Da into the workpiece 40 made by the advancing-side flank face 18a of the screw thread 18 is formed so as to be smaller than the indentation depth Db made by the following-side flank face 18b of the screw thread 18. Therefore, during tapping machining, reaction force Fa from the workpiece 40 applied to the advancing-side flank face 18a to plastically deform the workpiece 40 is reduced more than the reaction force Fb from the workpiece 40 applied to the following-side flank face 18b, and thus the reaction force Fb on the advancing-side flank face 18a is suppressed and a reduction in the durability and tool longevity of a thread forming tap 10 is suppressed.
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
Metalworking machine tools; machine tools for cutting and forming of metal materials; taps being machine tools; power drill bits for metalworking; thread milling cutters being machine tools; turning point tools for machine tools being power operated metalworking machine tools in the nature of turning tools; milling cutters for milling machines; power tools, namely, reamers; power tools, namely, end mills for machine tools; cemented carbide cutting tools for machine tools; anti-abrasive cemented carbide cutting tools; cemented carbide tips; diamond-pointed metal cutting tools; wear-resistant diamond-pointed metal-cutting tools for machine tools; rolling dies for use with machine tools
Metalworking machine tools; machine tools for cutting and forming of metal materials; taps being machine tools; power drill bits for metalworking; thread milling cutters being machine tools; turning point tools for machine tools being power operated metalworking machine tools in the nature of turning tools; milling cutters for milling machines; power tools, namely, reamers; power tools, namely, end mills for machine tools; cemented carbide cutting tools for machine tools; anti-abrasive cemented carbide cutting tools; cemented carbide tips; diamond-pointed metal cutting tools; wear-resistant diamond-pointed metal-cutting tools for machine tools; rolling dies for use with machine tools
Metalworking machine tools; machine tools for cutting and forming of metal materials; taps being machine tools; power drill bits for metalworking; thread milling cutters being machine tools; turning point tools for machine tools being power operated metalworking machine tools in the nature of turning tools; milling cutters for milling machines; power tools, namely, reamers; power tools, namely, end mills for machine tools; cemented carbide cutting tools for machine tools; anti-abrasive cemented carbide cutting tools; cemented carbide tips; diamond-pointed metal cutting tools; wear-resistant diamond-pointed metal-cutting tools for machine tools; rolling dies for use with machine tools
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
(1) Metalworking machines tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
An insert is provided, ensuring to vary the cutout angle of the cutting edge without replacing the body, and to prevent the change in the cutout angle of the cutting edge in the cutting process. The insert includes a constraining part, a through hole, and a blade. The blade includes a cutting edge for the cutting process. An outer surface of the constraining part around the central axis includes a pair of first constraining surfaces, and a pair of second constraining surfaces. The cutting edge in the state where the pair of first constraining surfaces are fixed becomes non-parallel to the cutting edge in the state where the constraining part is rotated around the central axis from the fixed state of the pair of first constraining surfaces to place the pair of second constraining surfaces on the same surface on which the pair of first constraining surfaces have been fixed.
A hard coating includes a three kinds of layers that are alternately laminated. The three kinds of layers consist of a single composition layer and two kinds of nanolayer-alternated layers. The single composition layer is constituted by one of an A composition (nitride of AlCrα), a B composition (nitride of AlTiCrβ) and a C composition (nitride of AlCr(SiC)γ). The two kinds of nanolayer-alternated layers include nanolayers which are alternately laminated and which are constituted by two of three combinations consisting of a combination of the A composition and B composition, a combination of the A composition and C composition and a combination of the B composition and C composition. The single composition layer has a thickness of 0.5-1000 nm. Each of the nanolayers constituting the two kinds of nanolayer-alternated layers has a thickness of 0.5-500 nm, and each of the two kinds of nanolayer-alternated layers has a thickness of 1-1000 nm.
B23B 27/14 - Cutting tools of which the bits or tips are of special material
C23C 28/04 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and only coatings of inorganic non-metallic material
C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
C23C 14/32 - Vacuum evaporation by explosionVacuum evaporation by evaporation and subsequent ionisation of the vapours
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
A hard coating includes a three kinds of layers that are alternately laminated. The three kinds of layers consist of a single composition layer and two kinds of nanolayer-alternated layers. The single composition layer is constituted by one of an A composition (nitride of AlCrSiα), a B composition (nitride of AlTiSiβ) and a C composition (nitride of AlCr(SiC)γ). The two kinds of nanolayer-alternated layers include nanolayers which are alternately laminated and which are constituted by two of three combinations consisting of a combination of the A composition and B composition, a combination of the A composition and C composition and a combination of the B composition and C composition. The single composition layer has a thickness of 0.5-1000 nm. Each of the nanolayers constituting the two kinds of nanolayer-alternated layers has a thickness of 0.5-500 nm, and each of the two kinds of nanolayer-alternated layers has a thickness of 1-1000 nm.
B23B 27/14 - Cutting tools of which the bits or tips are of special material
C23C 28/04 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and only coatings of inorganic non-metallic material
C23C 14/32 - Vacuum evaporation by explosionVacuum evaporation by evaporation and subsequent ionisation of the vapours
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
This three-fluted drill (1) comprises a body (3), discharge grooves (4), cutting flutes (5), thinning flutes (7), and gash sections (8). The body (3) extends centered on an axis (AX). The discharge grooves (4) are provided on an outer circumferential surface (31) of the body (3). The cutting flutes (5) are each provided on a ridgeline portion of the inner surface (41) of each discharge groove (4) and each relief surface (6) of the body (3). The thinning flutes (7) extend radially inward from an edge (51) of each of the cutting flutes (5). The gash sections (8) each have an R section (81) and a straight section (82). First ridgelines (811) of the R sections (81) and the relief surfaces (6) are each curved and extend radially outward from an edge (71) of each thinning flute (7) in a rotation direction (R). Second ridgelines (821) of the straight sections (82) and the relief surfaces (6) each linearly extend radially outward from an edge (812) of each first ridgeline (811), and each connect to the discharge grooves (4) further radially inward than the outer circumferential surface (31).
A thread forming tap including a complete thread portion and a leading portion that are provided with an external thread. A thread ridge of the external thread has, in an axial cross section, a triangular shape that is defined by a pair of flanks located on respective opposite sides in an axial direction, such that each of the flanks is inclined by a predetermined flank angle corresponding to a shape of a valley of an internal thread to be formed. A sharp crest is provided in a top portion of the thread ridge at least in the leading portion, and has, in the axial cross section, a triangular shape that is defined by a pair of side surfaces located on respective opposite sides in the axial direction, such that each of the side surfaces is inclined by an inclination angle that is larger than the flank angle.
KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION (Japan)
Inventor
Murasawa Koki
Yoshitake Tsuyoshi
Ali Mohamed Ali Ebrahim Abdelgawad
Abstract
A tool coated with a composite hard carbon coating film, which can have high hardness even when formed in a large thickness; and a method for producing a composite hard carbon coating film. In a composite hard carbon coating film 24, a first hard carbon layer 26 located on the side of a tool base material 22 has a thickness t1 of 0.2 to 3.0 μm and a density d1 of 2.1 g/cm3to 2.4 g/cm3, a second hard carbon layer 28 adhered on the first hard carbon layer 26 has a thickness t2 of 1.0 to 9.0 μm and a density d2 of 2.5 g/cm3to 3.0 g/cm3. Because the density of the first hard carbon layer 26 located on the side of the tool base material 22 is relatively smaller than the density of the second hard carbon layer 28 arranged on the first hard carbon layer 26, the first hard carbon layer 26 having a relatively smaller density can act as a cushioning layer even when the overall hardness and the overall thickness of the coating film are increased. As a result, the detachment of the coating film can be prevented and high wear resistance can be achieved as a whole.
C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
B23B 5/16 - Turning-machines or devices specially adapted for particular workAccessories specially adapted therefor for bevelling, chamfering, or deburring the ends of bars or tubes
B23B 27/14 - Cutting tools of which the bits or tips are of special material
A drill (1) is equipped with a body (10) and a head (30). The body (10) comprises cemented carbide and the head (30) comprises PCD. Spiral coolant passages (17, 18) are provided inside the body (10). Oil holes (25, 26) are provided in the body-side joint surface of the body (10). The oil holes (25, 26) are the outlets of the coolant passages (17, 18). The coolant passages (37, 38) provided inside the head (30) extend from the oil holes (45, 46) provided at the tip (31) toward the rear end (32). The head-side joint surface of the head (30) is joined to the body-side joint surface. Two oil holes are provided in the head-side joint surface. The two oil holes are the inlets of the coolant passages (37, 38) and communicate with the oil holes (25, 26) in the body-side joint surface.
The invention is provided with large-diameter blades 111a to 111e that are formed in an arcuate shape of a greater radius of curvature than a ball radius R1. Cutting of a flat surface by each of the large-diameter blades 111a to 111e therefore makes it possible to improve the surface roughness of a machined surface as compared to if the flat surface is cut with ball blades formed in an arcuate shape of a single radius of curvature. Furthermore, because each of the large-diameter blades 111a to 111e is formed in an arcuate shape, cutting of a curved surface with each of the large-diameter blades 111a to 111e makes it possible to improve the surface roughness of the machined surface as compared to if the curved surface is cut with a rectilinear cutting blade. Accordingly, the pick feed can be increased during cutting of the flat surface and curved surface by each of the large-diameter blades 111a to 111e. It is therefore possible to improve the machining efficiency in cutting both the flat surface and the curved surface.
Provided is a rotary cutting tool that can be supplied with a sufficient amount of coolant, reduce the progress of cutting-edge wear, and achieve cutting efficiency without a significant increase in the diameter of a shank portion. In an outer peripheral surface of a shank portion 14, three coolant guide recessed grooves 18 each having a start end 18a at an end surface 14b of the shank portion 14 and a termination end 18b in a tapered outer peripheral surface 16a of a connection portion 16 are formed apart from each other at equal intervals in the circumferential direction of the outer peripheral surface of the shank portion 14. Each coolant guide recessed groove 18 has a flat groove cross section with a groove width w greater than a groove depth d, and guides the coolant from the shank portion 14 to the connection portion 16. Therefore, even without a significant increase in the diameter of the shank portion 14 compared to the case where a coolant guide hole penetrating inside the shank portion 14 is provided, it is possible to obtain a sufficient amount of coolant supply, reduce the progress of cutting-edge wear, and achieve cutting efficiency without a significant decrease in the rigidity of the shank portion 14.
A drill includes a leading end portion. The leading end portion is flat and has at least two cutting blades extending from a rotation center toward outside in a radial direction. The each cutting blade includes an arc-shaped portion. An inside linear portion is formed in a linear shape and connects to one end of the arc-shaped portion on the rotation center side. An outside linear portion is formed in a linear shape and connects to another end of the arc-shaped portion on an opposite side to the one end. The arc-shaped portion has a cutting edge provided with an arc-shaped portion chamfered surface. The inside linear portion and the outside linear portion each has a cutting edge provided with a linear portion chamfered surface. A drill axis direction width of the arc-shaped portion chamfered surface is smaller than a drill axis direction width of the linear portion chamfered surface.
Two discharge grooves (4) are formed in a drill (1). A cutting edge (5) is formed on a ridge section between an inner face (41) that faces a rotation direction (T) side of the discharge groove (4), and a flank (6). A thinning edge (7) is formed from an inner end (51) of the cutting edge (5) to the side of a chisel (9), by thinning processing, and further, a gash portion (8) is formed from an inner end (72) of the thinning edge (7), the gash portion extending in a circular arc shape and being connected to the discharge groove (4) further to an inner side in the radial direction than an outer peripheral surface (31). A circular arc groove (10) is formed in a section connecting a thinning face (71) and a gash face (81). The chips being cut by the thinning edge (7) are scooped up to the gash portion (8), are curled, and are discharged to the discharge groove (4). The chips are not likely to become caught by being provided with the circular arc groove (10). Since the gash portion (8) connects to the discharge groove (4) further to the inner peripheral side than the outer peripheral surface (31), the chips are cut relatively small.
An object is to provide a thread forming tap configured to obtain an inside diameter dimension of a female thread having a targeted processing accuracy more easily than in related art. A thread forming tap (1) is a cold forming tap for forming a female thread by causing plastic deformation of a prepared hole of a workpiece, and includes a male thread portion (3) that protrudes in a thread shape in a radial direction. The male thread portion includes at least one protruding portion (5), which includes a plurality of first thread ridges (51) arranged in an axial direction and that protrude in the radial direction and a first root (52) formed between the first thread ridges adjacent to each other in the axial direction, and at least one adjustment portion (6), which is arranged with the at least one protruding portion in one lead of the male thread portion. A distance from an axial center to a section of the adjustment portion corresponding to the first root in the one lead is longer than a root diameter of the first root and shorter than a ridge diameter of the first thread ridge adjacent to the first root.
(1) Metalworking machines and tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
(1) Metalworking machines and tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
(1) Metalworking machines and tools; cutting tools for metalworking, namely machine cutting tools for metalworking; metalworking machines and tools, namely, taps and turning point tools; drill bits for metal working machines; thread milling cutters being machine tools; milling cutters being machine tools; reamers being machine tools; end mills; cemented carbide tools for metalworking; cemented carbide cutting tools; anti-abrasive cemented carbide tools for metalworking; cemented carbide tips for metalworking; diamond tools for metalworking; diamond-pointed metal cutting tools for metalworking; wear-resistant diamond-pointed metal-cutting tools for metalworking; rolling dies being machine tools.
Metalworking machine tools; Machine tools for cutting and forming of metal materials; Taps being machine tools; Power drill bits for metalworking; Thread milling cutters being machine tools; Turning point tools being machine tools; Milling cutters being machine tools; Power tools, namely, reamers; Power tools, namely, end mills for machine tools; Cemented carbide cutting tools for machine tools; Anti-abrasive cemented carbide cutting tools; Cemented carbide tips; Diamond-pointed metal-cutting tools; Wear-resistant diamond-pointed metal-cutting tools for machine tools; Rolling dies for use with machine tools
Metalworking machine tools; Machine tools for cutting and forming of metal materials; Taps being machine tools; Power drill bits for metalworking; Thread milling cutters being machine tools; Turning point tools being machine tools; Milling cutters being machine tools; Power tools, namely, reamers; Power tools, namely, end mills for machine tools; Cemented carbide cutting tools for machine tools; Anti-abrasive cemented carbide cutting tools; Cemented carbide tips; Diamond-pointed metal-cutting tools; Wear-resistant diamond-pointed metal-cutting tools for machine tools; Rolling dies for use with machine tools
Metalworking machine tools; Machine tools for cutting and forming of metal materials; Taps being machine tools; Power drill bits for metalworking; Thread milling cutters being machine tools; Turning point tools being machine tools; Milling cutters being machine tools; Power tools, namely, reamers; Power tools, namely, end mills for machine tools; Cemented carbide cutting tools for machine tools; Anti-abrasive cemented carbide cutting tools; Cemented carbide tips; Diamond-pointed metal-cutting tools; Wear-resistant diamond-pointed metal-cutting tools for machine tools; Rolling dies for use with machine tools
