The present application provides a composite carbon layer for a surface of a cutter and a preparation method therefor, and a cutter. The composite carbon layer comprises a low-hardness carbon layer and a high-hardness carbon layer, which are alternately deposited on a surface of a cutter from the surface outward, wherein at least two instances of alternate deposition are performed; the hardness of the low-hardness carbon layer is 15-35 GPa, and the hardness of the high-hardness carbon layer is 40-65 GPa; and the thickness ratio of the high-hardness carbon layer to the low-hardness carbon layer is 0.5-5.6. In the present application, by alternately arranging low-hardness and high-hardness coatings, the low-hardness carbon layer is periodically implanted into the high-hardness carbon layer, and therefore the accumulation of stress in the high-hardness carbon layer can be effectively buffered, the overall stress of the coatings is kept at a relatively low level, the risk of the coatings being prone to fractures due to thickening is avoided, and large-thickness deposition is achieved; moreover, the composite carbon layer is ensured to have high hardness and good wear resistance; and the composite carbon layer has a simple structure, stable performance, a low cost and a wide range of applications.
A carbon-based coating for a tool surface. The carbon-based coating sequentially comprises, from a tool surface to the outside, a high-content sp3bond carbon layer, a gradient layer, and a high-content sp2bond carbon layer, wherein the high-content sp3bond carbon layer has an sp3bond content of 50-80%, the high-content sp2bond carbon layer has an sp2bond content of 50-80%, and the sp3bond content in the gradient layer decreases from high to low from the inside to the outside. In the carbon-based coating, a carbon layer mainly comprising an sp3bond and a carbon layer mainly comprising an sp2 bond are separately provided, the former provides high hardness and wear resistance, and the latter has a low friction coefficient and good lubricity; the carbon-based coating has a gradient layer between the two carbon layers, so that a gradual transition is achieved between the properties of the two layers, avoiding the problem of poor bonding, improving stability, reducing the internal stress in the coating, avoiding the risk of easy breakage, achieving high thickness deposition.
Blades [parts of machines]; finishing machines; tools for
threading; grindstones [parts of machines]; tools [parts of
machines]; turning tools; milling cutters [parts of
machines]; circular saw blades [parts of machines]; cutting
apparatus [parts of machines]; drilling bits [parts of
machines].
A cutter having a hard coating and a superhard coating, and a manufacturing method therefor. The cutter comprises a cutter body (10), a chip groove (11) and a helicoid (12) being provided on the outer periphery of the cutter body; the circumferential length of the helicoid ranges from 0% to 80% of the circumferential length of the cutter body, a hard coating (2) is deposited on the helicoid, the thickness of the hard coating at positions where the distances to the tip end of the cutter body are L3 and L2 in the axial direction of the cutter body is H1 and H2, respectively, L2 being greater than L3, and the ratio of H2/H1 ranging from 1 to 1.5; the outer diameter of the cutter body at the hard coating is D1, and the outer diameter of the cutter body outside the helicoid is D2, D2 being less than D1; and the cutter body is further provided with a superhard coating (6), the superhard coating being deposited on the surface of the cutter body and the surface of the hard coating. The cutter having a hard coating and a superhard coating has a good machining effect and a long service life.
B23P 15/32 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
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
7.
CUTTER WITH HARD COATING AND MANUFACTURING METHOD THEREFOR
Disclosed are a cutter with a hard coating, and a manufacturing method for the cutter. The cutter comprises a cutter body (10). A chip removal groove (11) and a spiral surface (12) are provided at the periphery of the cutter body. The circumferential length of the spiral surface is more than 0 percent and less than 80 percent of the circumferential length of the cutter body. A hard coating (2) is deposited on the spiral surface. The thicknesses of the hard coating at portions L3 and L4 from a tip end of the cutter body in an axial direction of the cutter body are H1 and H2 respectively, wherein L4 is greater than L3, and H2 / H1 is more than 1 and less than 1.5. The outer diameter of the portion, at the hard coating, of the cutter body is D1, and the outer diameter of the portion, outside the spiral surface, of the cutter body is D2, wherein D2 is less than D1. The cutter with a hard coating has a good machining effect and a long service life.
The present disclosure discloses an integrated rotary cutting tool manufacturing device and method, the integrated rotary cutting tool manufacturing device comprises a workpiece transfer device, a machine body, a feeding device, grinding devices and a discharge device. The grinding devices comprise a rough grinding device used for carrying out primary grinding on a vertically arranged workpiece and a fine grinding device used for carrying out secondary grinding on the vertically arranged workpiece. The integrated rotary cutting tool manufacturing device is adopted by the rotary cutting tool manufacturing method. The device according to the present disclosure is compact in structure, high in machining efficiency and precision, and low in costs, the maximum values, the minimum values and the average values of the roundness and the concentricity of machined micro drill bits are closer to the standard values, and the stabilization process capability indexes of the roundness.
B24B 3/24 - Sharpening cutting edges, e.g. of toolsAccessories therefor, e.g. for holding the tools of drills
B24B 41/00 - Component parts of grinding machines or devices, such as frames, beds, carriages or headstocks
B24B 41/06 - Work supports, e.g. adjustable steadies
B24B 53/075 - Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels for workpieces having a grooved profile, e.g. gears, splined shafts, threads, worms
9.
CUTTER COMPOSITE COATING, CUTTER, AND METHOD FOR PREPARING CUTTER COMPOSITE COATING
A cutter composite coating, a cutter, and a method for preparing a cutter composite coating. The cutter composite coating comprises a basal layer (1) coated on a cutter body and an outermost top layer (4). The basal layer (1) is a diamond layer or a cubic boron nitride layer and has a thickness of 1 to 40 μm, and the top layer (4) is a tetrahedral amorphous carbon film layer and has a thickness of 0.01 to 15 μm. The cutter comprises a cutter substrate and the cutter composite coating. The method for preparing a cutter composite coating is used for preparing the cutter composite coating. According to the provided cutter composite coating, cutter, and method for preparing a cutter composite coating, by depositing, on the surface, a multilayer nanocomposite coating having high hardness, a low coefficient of friction, a good bonding force and good high temperature resistance, the wear resistance of a cutter is significantly improved, the drill bit breakage rate is greatly decreased, and the problems of a built-up edge and chip removal flute blockage are avoided.
C23C 14/16 - Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
B32B 9/04 - Layered products essentially comprising a particular substance not covered by groups comprising such substance as the main or only constituent of a layer, next to another layer of a specific substance
B32B 27/14 - Layered products essentially comprising synthetic resin next to a particulate layer
B32B 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatingsLayered products designed for particular purposes not covered by another single class
C23C 14/32 - Vacuum evaporation by explosionVacuum evaporation by evaporation and subsequent ionisation of the vapours
10.
METHOD FOR PRETREATING DIAMOND COATING OF CEMENTED CARBIDE DRILL BIT
A method for pretreating a diamond coating of a cemented carbide drill bit comprises the following steps: (1) cleaning the surface of a drill bit; and (2) conducting a Co removal chemical pretreatment on the drill bit, the Co removal chemical pretreatment comprising: corroding a WC phase of the drill bit with an alkali liquor, and corroding a Co phase of the drill bit with an acid liquor, wherein when the drill bit is etched with the alkali liquor or the acid liquor, an etched portion is a blade of the drill bit including a tip, of which a length A from the tip and the length L of a drill bit groove satisfies a relationship of L1/10 ≤ A ≤ L9/10. The method overcomes an adverse effect of a Co removal treatment on the strength of a tool base, and also ensures a desirable binding force between a diamond coating and the base, and does not affect the machinability of the drill bit.
A cutter composite coating, a cutter, and a method for preparing a cutter composite coating, applicable to the technical field of drilling tools. The cutter composite coating comprises a core layer (3) and a top layer (4). The core layer (3) is a MeAlX composite layer and has a thickness of 0.1 to 10 μm, and the top layer (4) is a tetrahedral amorphous carbon film layer and has a thickness of 0.01 to 10 μm, wherein Me represents at least one of metallic elements such as Ti, Cr, V, Mn, Fe, Co, Ni, Cu and Zr and a nonmetallic element, Si, X represents one or two or three of N, C and B, and the atomic ratio of Al content in MeAlX satisfies 0.30≤Al/(Al+Me)≤0.80. The cutter comprises a cutter substrate and the cutter composite coating. The method for preparing a cutter composite coating is used for preparing the cutter composite coating. The present invention can decrease the drill bit breakage rate, improve the service life of a cutter by 4 to 10 times, can ensure drilling quality, and reduce production costs.
C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating 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 single-blade micro drill bit. A spiral-shaped first chip removal groove (1), a spiral-shaped second chip removal groove (2) and a spiral-shaped third chip removal groove (3) are formed in a first end face of a first end (100) of the drill bit towards a second end (200). The first chip removal groove (1) and the second chip removal groove (2) are in 180-degree rotational symmetry with a drill core as the center. A partial edge of the first chip removal groove (1) forms a main cutting blade (5). The edge, in central symmetry to the main cutting blade (5), on the second chip removal groove (2) is cut away to form the third chip removal groove (3) without a cutting effect. The main cutting blade of the drill bit has enough support, and improves the chip removal performance and the drilling precision.
A semicircular drill (1) comprises a drill handle (11) used for mounting and holding, and a drill rod (12) used for machining operations of reaming and milling. The drill rod (12) comprises a first machining rod (121) and a second machining rod (122) both having a semicircular cross section, and the first machining rod (121) has a smaller diameter than the second machining rod (122). The first machining rod (121) has one end connected to the second machining rod (122), and the other end provided with a drilling structure (13) for drilling a hole, and a transitional step (14) for reaming the wall of a hole is provided at a joint location between the first machining rod (121) and the second machining rod (122). The semicircular drill has superior hole drilling efficiency and a long service life, and can ensure machining quality of the wall of a hole, thus meeting current quality requirements of hole machining.
An integrated apparatus and a manufacturing method for a rotary cutting tool. The apparatus comprises a workpiece transfer device, a machine body, a feeding device, a grinding device, and a discharging device. The grinding device comprises a coarse grinding device used for performing first grinding on a vertically disposed workpiece, and a fine grinding device used for performing second grinding on the vertically disposed workpiece. The integrated manufacturing apparatus for a rotary cutting tool is used in the manufacturing method for a rotary cutting tool. The apparatus has a compact structure, high processing efficiency, high precision, and low costs.
Disclosed is a rotary cutting tool, comprising a cutting portion (10), wherein the cutting portion (10) is provided with an auxiliary spiral groove (102) and a plurality of right-handed main spiral grooves (101) with the same spiral angle. The auxiliary spiral groove (102) comprises a left-handed spiral groove spiralling up from a front end of the cutting portion (10) to a rear end thereof. The auxiliary spiral groove which spirals up and the main spiral grooves are provided with a plurality of cutting teeth (130) with trapezoidal sections at the cutting portion (10). Along the spiral direction of the auxiliary spiral groove, the tooth widths of adjacent cutting teeth (130) are partially superposed. Since the tooth shape of the rotary cutting tool is of an approximately rectangular trapezoidal structure, it is ensured that the tooth width is substantially unchanged in the process of cutting and as abrasion increases, thereby ensuring the stability of cutting. Moreover, the alternation of teeth on the rotary cutting tool helps to remarkably improve chip-removal performance and cutting performance, so that not only are machined board edges of good quality, but also the service life of the cutting tool is prolonged.
Disclosed is a rotary cutting tool, comprising a cutting portion (10), wherein the cutting portion (10) is tapered such that the diameter of a front end (110) of the cutting portion (10) is less than the diameter of a rear end of the cutting portion (10). The cutting portion (10) is provided with a plurality of main spiral grooves (101) with the same spiral angle. All the main spiral grooves (101) are evenly distributed along a circumferential direction, and the spiral direction of all the main spiral grooves (101) is right-handed. The cutting portion (10) is also provided with an auxiliary spiral groove (102), wherein the auxiliary spiral groove (102) comprises a left-handed spiral groove spiralling up from the front end of the cutting portion (10) to the rear end thereof. The auxiliary spiral groove (102) which spirals up and the main spiral grooves (101) are provided with a plurality of cutting teeth (130) at the cutting portion (10), and along the spiral direction of the auxiliary spiral groove (102), the tooth widths between adjacent cutting teeth (130) are partially superposed. Since the auxiliary spiral groove and the main spiral grooves of the cutting portion of the rotary cutting tool respectively adopt a left-handed spiral structure and a right-handed spiral structure, the actual area of the cross section of the spiral grooves is enlarged, so that the grooves are not easily jammed by chips, the service life can be prolonged by 86.24%, and precision can be increased by 33.89%.
A drill bit for drilling a PCB comprises a body (10). One end of the body (10) is a drill tip, and a groove and breadth ratio constant segment and a groove and breadth ratio alternating change segment are sequentially disposed from the end where the drill tip is located to the other end of the body (10). A long spiral groove (101) and a short spiral groove (102) that are spirally surrounding and that are not intersected are formed in the outer side of the body. The groove and breadth ratio of each of the long spiral groove (101) and the short spiral groove (102) is constant at the groove and breadth ratio constant segment. The groove and breadth ratio of each of the long spiral groove (101) and the short spiral groove (102) changes alternately at the groove and breadth ratio alternating change segment. The short spiral groove of the groove and breadth ratio constant segment is connected to a staggered groove staggered with the short spiral groove. In the drill bit for drilling a PCB, the double-spiral-groove non-intersection design is used, the groove and breadth ratio alternately changes on the rear section of the drill bit, the two grooves discharge cuttings independently, the drill bit is unlikely to be blocked by the cuttings, and the cutting temperature can be controlled in a small range. In addition, the area of a cross section entity of the spiral groove and the core thickness taper can be increased, the bend resistance strength of the drill bit is improved, the hole site machining precision is high, and the machining quality of a drilled hole is good.
A PCB micro drill comprises a drill body (1), at most three main cutting edges (212, 212', 221), and a composite drill tip (2) located at one end of the drill body. The composite drill tip comprises a first drill tip (21) and a second drill tip (22). The second drill tip is disposed at an end portion of the drill body. The first drill tip starts from the top end of the second drill tip and extends and protrudes outwards in the direction parallel to the central axis of the drill body. The first drill tip comprises a chisel edge (211) intersecting with the central axis of the drill body, an inner main cutting edge (212) connected to an end portion of the chisel edge, and a first inner vertex angle rear tool surface (213) clamped between the inner main cutting edge and the chisel edge. According to the micro drill, the drill tip is the composite drill tip consisting of the first drill tip and the second drill tip. The composite drill tip improves the centering effect of downward drilling during hole site machining for the PCB micro drill, improves the hole site accuracy, and prevents a failure in a hole site or a hole shape.
The present invention relates to the field of manufacture of miniature drills and discloses a miniature drill, which includes a drill body, a drill tip formed at one end of the drill body, and a plurality of spiral chip slots spiraling on a surface of the drill body; the chip slots include a long chip slot, a short chip slot, and a communicating chip slot, the long chip slot and the short chip slot are arranged at intervals and have the same helix angles, and the long chip slot is communicated with the short chip slot by the communicating slot. In the miniature drill provided by the present invention, the long chip slot and the short chip slot that have the same helix angle and do not intersect are communicated with each other by the communicating slot, which effectively avoids swing of the drill tip caused by deviation of the centroid from the rotation axis and affecting the position accuracy of the drilled holes; moreover, the communicating slot broadens the widths of the chip slots, increases the chip space, and thereby improves the heat dissipating property; furthermore, the communicating slot reduces the width of the body clearance and reduces heat generated by friction between the body clearance and walls of the drilled holes, which enhances the ability of resisting breaks caused by the thermal deformation of the miniature drill.
B23B 35/00 - Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machinesUse of auxiliary equipment in connection with such methods
A miniature drill bit. The miniature drill bit comprises: a first rake face, a first flank face, a second rake face and a second flank face that are arranged at the position of a drill point; a first spiral groove extending from the drill point to a drill tail, and a second spiral groove symmetrical to the first spiral groove, the first spiral groove being intersected with the first rake face to form a first cutting edge, and the second spiral groove being intersected with the second rake face to form a second cutting edge; and a bias groove arranged at the position of a large-bit area of the drill bit, the bias groove being intersected with the second rake face, so that the length of the second cutting edge is smaller than that of the first cutting edge, and the bias groove being intersected with the second spiral groove.
A micro-drill includes a first rake face, a first rear face, a second rake face, a second rear face, a first spiral groove extending from a drill point to a tail of the drill, a second spiral groove symmetrically arranged about the first spiral groove, and a biasing groove arranged in front of the drill point. Where the first rake face, the first rear face, the second rake face, and the second rear face are arranged on the drill point. The first spiral groove and the first rake face intersect to form a first cutting edge, and the second spiral groove and the second rake face intersect to form a second cutting edge. The biasing groove and the second rake face intersect to make a length of the second cutting edge be less than a length of the first cutting edge, and the biasing groove and the second spiral groove intersect each other.
Disclosed is a micro-drill, comprising a drill body (2) and a drill tip (1) which is formed at one end of the drill body (2). One or more helical chip flutes are circled around the surface of the drill body (2). The chip flute comprises a long chip flute (21), a short chip flute (22) and a communicating flute (23), wherein the long chip flute (21) and the short chip flute (22) are arranged apart from each other and have the same helix angle; and the long chip flute (21) and the short chip flute (22) are in communication through the communicating flute (23). The long chip flute (21) and the short chip flute (22) which have the same helix angle and do not intersect are in communication through the communicating flute (23), so that the micro-drill effectively avoids the phenomenon that the positional accuracy of a drilled hole is influenced due to the swinging of the drill tip which is caused by the fact that the centre of mass deviates from an axis; moreover, the width of the chip flute is widened by the communicating flute, so as to increase the chip space, thereby improving the heat dissipation performance; and the communicating flute reduces the width of a land, thereby reducing the frictional heating of the land and a hole wall, and thus enhancing the capability of the micro-drill of resisting breakage caused by thermal deformation.
A miniature drill and a method for processing the miniature drill are disclosed. The miniature drill comprises a drill tip (41) and a drill body (42). The drill tip (41) comprises two main cutting edges, two main tool faces and two auxiliary tool faces symmetrical with respect to the axial center of the miniature drill. The drill body (42) is provided with two chip flutes (44, 45) which rise in spiral, wherein the chip flutes (44, 45) comprise a long chip flute (44) and a short chip flute (45). The helix angle of the short chip flute (45) is different from that of the long chip flute (44). The short chip flute (45) and the long chip flute (44) are changed from a separate situation to a merging situation. The short chip flute (45) ends in the position where it is crossed with the long chip flute (44). The two chip flutes (44, 45) are formed as the long chip flute (44) and the short chip flute (45), the helix angle of the short chip flute (45) is different from that of the long chip flute (44), the short chip flute (45) ends in the position where it is crossed with the long chip flute (44), and the main part of the drill body (42) is only provided with the single long chip flute (44), so the drill has the advantages of increasing the rigid portion of the flute body, enlarging the thickness of the core and improving the rigidity of the drill body.
Power drill bits; drilling machines and parts therefor; power tools, namely, routers and end mills; milling cutters for milling machines; machine tools, namely, milling cutters; machine parts namely, blades; electric knives; cutting machines for metalworking, grinding machines for metalworking; lathes; machine parts, namely, circular saws; threading machines; machine parts, namely, grindstones; machine parts, namely, millstones