A method (10), performed by a centrifuge (1), for treating toughness and hardness of drill bit buttons (30) is provided. The centrifuge (1) comprises a chamber (2) formed by a stationary side wall (3) and a bottom (4) which is rotatable around a rotation axis (A), the bottom (4) comprising one or more protrusions (4b) which at least partly extends between the rotation axis (A) and the side wall (3), the side wall (3) comprising at least six pushing elements (3b) arranged around a periphery of the side wall (3). The method (10) comprises; - rotating (11), by rotation of the bottom (4) with the protrusions (4b), the drill bit buttons (30) around the rotation axis (A), - pushing (12), by the pushing elements (3b), the drill bit buttons (30) from the side wall (3) during the rotation of the bottom (4), - collectively forming (13) the drill bit buttons (30) into a torus shape at the bottom (4) of the chamber (2) for inducing collisions between the drill bit buttons (30), thereby treating the toughness and hardness of the drill bit (30).
B24B 31/108 - Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work or the abrasive material is looseAccessories therefor involving other means for tumbling of work involving a sectioned bowl, one part of which, e.g. its wall, is stationary and the other part of which is moved, e.g. rotated
B22F 3/24 - After-treatment of workpieces or articles
B24C 1/08 - Methods for use of abrasive blasting for producing particular effectsUse of auxiliary equipment in connection with such methods for polishing surfaces, e.g. by making use of liquid-borne abrasives
C21D 7/04 - Modifying the physical properties of iron or steel by deformation by cold working of the surface
C22F 1/10 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
C23F 11/00 - Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
C23G 1/00 - Cleaning or pickling metallic material with solutions or molten salts
A cutting tool (10) is provided. The cutting tool (10) comprises a tip (20), a body (30) and a shank (50). The tip (20) has a tip radius (23) and a tip length (24). The body (30) has a body radius (41, 42, 43) and a body length (34) between the shank (50) and a recess portion (35) along a longitudinal axis (A) of the body (30) The recess portion (35) comprises a wall (36) which forms a recess (33) with a depth (45) into the body (30) for retaining a major part of the tip length (24) within the recess (33). The body radius (42) at half the depth (45) of the recess (33) does not exceed two tip radiuses (23). The tip (20) is made of a hard metal alloy with a hardness of at least 1300 HV50 and the body (30) is made of a steel alloy with a hardness of at least 450 HV30.
E01C 23/12 - Devices or arrangements for working the finished surfaceDevices for repairing the surface of damaged paving for taking-up, tearing-up, or breaking-up paving
A joint for joining together drill string components (6, 7) of a drill string for percussion drilling, the joint including a male part (8) and a female part (9) f wherein a first impact surface (10) is arranged to co-operate with a second impact surface (11). When the drill string is in operation, relative axial movement is allowed, between the male (8) and the female (9) parts when the first and the second impact surfaces (10,11) are adjacent to each other. The invention also concerns a male joint part, a female joint part, a drill rod, a shank adapter, a drill head, a drill bit and a drill string component.
E21B 17/042 - CouplingsJoints between rod and bit, or between rod and rod threaded
E21B 17/046 - CouplingsJoints between rod and bit, or between rod and rod with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
E21B 17/043 - CouplingsJoints between rod and bit, or between rod and rod threaded with locking means
A threaded drill string component (2) for percussive drilling, said drill string component (2) having a central axis (A) and a threaded male portion (4) exhibiting: a proximal end portion (4'), a distal end portion (4'') having an axially directed, substantially planar impact surface (7), a thread ridge (5) and a thread bottom (6). The distal end portion (4'') is formed such that at least a part of a peripheral wall thereof, which is adjoining to the impact surface (7), is located at a first distance (R1) from the central axis exceeding a second distance (R2) between the central axis and an innermost portion of a wall of the thread bottom, such that an enlarged impact surface is created. The invention also relates to a thread joint and a method of manufacture.
A drill bit (6) for percussion rock drilling including: - an impact portion (26) with an impact surface (9) for striking against rock in an impact direction (R), - an engagement portion (27) with: i) holder means (10) for holding the drill bit axially in a drill head of a drill string, and ii) rotation engagement means (11) for connecting the drill bit with the drill head for the purpose of rotation of the drill bit (6), - an anvil surface (14) being directed opposite to the impact direction for receiving shock waves from a striker rod (15) of the drill string, and - flushing channel means for transfer of flushing fluid to the impact surface (9). The holder means (10) and the anvil surface (14) are inside a holder recess (17) having an opening that is directed opposite to the impact direction (R). The invention also concerns a drill string component, a system and a method.
A device in an drill string component for percussive rock drilling including a thread for threading together with another drill string component being provided with a complementary thread, wherein the thread includes a thread groove (9) formed by two thread flanks (10, 11), whereof one in operation forms a pressure flank, and an intermediate thread bottom (12), and wherein the thread groove (9) has an essentially equally shaped sectional form along its axial extension. The thread bottom (12) exhibits at least three surface portions (Y1, Y2, YC) with part-circular shape, as seen in an axial section, and said surface portions (Y1, Y2, Y3) with part -circular shape have increasing radiuses, as seen from each thread flank to an intermediate surface portion of the thread bottom. The invention also relates to a thread joint and a drill string component.
A neck adapter (2) comprises an elongated body (4), with an outer surface and an inner surface. A first part (17) of the outer surface is provided with a first corrosion protecting coating and a second part of the outer surface and/or the inner surface is provided with a second corrosion protecting coating. The first and second corrosion protecting coatings constitutes different material. Further a rock drill comprising a neck adapter (2) and a method to corrosion protect a neck adapter (2) is presented.
The present invention comprises a hard metal insert (1 ) intended to be comprised within a drill bit for percussion drilling, which insert comprises a cap (2), which constitutes a wear part comprising a wear surface (2a) and a cylindrical part (3), which constitutes a mount with a cross-sectional area (A) and a diameter (D) The cap (2) comprises a front part (4) with an extension (H) along the axis of symmetry (x) of the insert from a first point (a) on the wear surface (2a) of the cap to a second point (b) in the cap. The front part (4) constitutes a volume (Vf) between a first plane (I), which intersects at right angle to the axis of symmetry (x) at the first point (a), and a second plane (II), which intersects at right angle to the axis of symmetry (x) at the second point (b). The volume (Vf) is greater than or equal to 0.6 times the cross-sectional area (Af) of the front part in the second plane times the distance (H) along the axis of symmetry (x) between the first point (a) and the second point (b), and the diameter (Df) of the front part in the second plane is greater than or equal to 0.5 times the diameter (D) of the mount and less than or equal to 0.6 times the diameter (D) of the mount. The invention also relates to a method for regrinding a worn insert.
Drill string components (2;18) for top hammer drilling and down-the-hole drilling for positioning between a drill rig and a drill bit including a pipe-shaped element (3;19), which is arranged for transferring only rotational movements from the drill rig to the drill bit. A vibration-damping structure (12) is arranged adjoining to at least a part of an inside (H') of the pipe-shaped element in a space (41) formed inwardly of said inside (H'). The invention also concerns a rock drilling equipment.
Drill bit (10) for a rock drilling tool (12), which drill bit (10) has a drilling surface (10b) that contacts rock during drilling. A longitudinal cross section (10t) of the drill bit (10) through the drilling surface (10b) exhibits the following relationships of Ltot(depth)/Ltot(5.0) and H(depth)/H(5.0) at the specied depths, where H(depth)/H(5.0) is measured according to a Vickers test and Ltot(depth)/Ltot(5.0) is measured according to the Palmqvist method, described in this document substantially along the drill bit's longitudinal axial centre line (C): (table (I)). If the drill bit (10) has en length (L) of 10mm or greater, and a longitudinal cross section (10t) of the drill bit (10) through the drilling surface (10b) exhibits the following relationships of Ltot(depth)/Ltot(3.5) and H(depth)/H(3.5) at the specified depths, where H(depth)/H(3.5) is measured according to a Vickers test and Ltot(depth)/Ltot(3.5) is measured according to the Palmqvist method described in this document, substantially along the drill bit's longitudinal axial centre line (C): (table (II)). If the drill bit (10) has en length (L) less than 10 mm.
This invention relates to a grinding appliance for grinding of button drill bits which comprise a drilling head with a plurality of buttons, and a method for manufacturing such a grinding appliance. The grinding appliance comprises a first element provided with an abrasive facing comprising diamonds as the abrasive medium and adapted to grinding a button to an intended end profile shape, and a second element adapted to grinding the drilling head. At least one section of the second element is provided with an abrasive facing comprising diamonds as the abrasive medium, the average grain size for the diamonds in the second abrasive facing being of a different average grain size from those in the first abrasive facing.
The invention pertains to a neck adaptor at a drilling device for rock drilling. The neck adaptor is cylindrical and comprises an envelope surface, a front end surface, a central axial passage which orifices at the front end surface, and a radial side-flushing hole which extends from the central axial passage and orifices in the envelope surface. The side-flushing hole has an oblong cross-section which extends along a mid axis from a front end of the cross-section of the side-flushing hole to a rear end of the cross-section of the side-flushing hole. The mid axis is substantially parallel with the central axial passage. The front end faces the front end surface of the neck adaptor. The cross- section of the side-flushing hole is wing profile shaped. The cross-section is divided up into two cross-section parts perpendicular against the mid axis, so that each of the two cross-section parts has substantially the same length of the mid axis. The two cross- section parts comprise a front cross-section part comprising the front end of the cross- section of the side-flushing hole, which front cross-section part has a front cross-section area, and a rear cross-section part comprising the rear end of the cross-section of the side-flushing hole, which rear cross-section part has a rear cross-section area. The front cross-section area is formed to be smaller than the rear cross-section area.
The invention concerns a method for grinding button drill bits, in which an abrasive wheel is used to restore the original form of a button in a button drill-bit. The grinding is carried out according to the invention at a temperature in the grinding region of approximately 250-700 °C. The invention concerns also an arrangement for the grinding of button drill-bits in which an abrasive wheel is used to restore the original form of a button in the button drill-bit, which abrasive wheel is provided with upright side flanges and an intermediate groove, where the arrangement comprises an arrangement for directing a stream of a cooling agent onto the side flanges and groove of the abrasive wheel. The invention concerns also an abrasive wheel that comprises diamonds with a mean particle size of 200 &mgr;m or greater, embedded in a matrix.
06 - Common metals and ores; objects made of metal
07 - Machines and machine tools
Goods & Services
[ UNFINISHED DRILL STEEL ] ROCK DRILLING TOOLS AND INSERTS AND TIPS AND BUTTONS THEREFOR; MACHINES FOR GRINDING AND FORGING ROCK DRILLING TOOLS AND THEIR PARTS; HOLLOW AND SOLID DRILL STEEL [ AND HARD CARBIDE METAL TOOLS ]
