Abstract: A metal cutting insert comprises a carbide substrate, and at least one body of superhard abrasive material, such as PCD or PCBN, bonded to an edge surface of the substrate and extending from one side surface to the other side surface of the substrate. There can be a plurality of superhard bodies disposed at respective corners of the substrate. The abrasive material is applied to the substrate in a container and then sintered and simultaneously bonded to the substrate by an elevated pressure/temperature step. Inserts can be made in rod form (i.e., in one piece) and then the rod can be transversely sliced into thin inserts; or the inserts can be made in separate pieces, with or without separators within the container.

Abstract: A tool holder has a insert-support surface and a wedge-support surface. A pin projects upwardly from the insert-support surface and enters a through-hole of a cutting insert that is seated on the insert-support surface. The wedge-support surface includes a front portion disposed adjacent the insert-support surface and a rear portion extending upwardly from the front portion at an inclination. A wedge contacts both of the front and rear portions and is secured by a fastening screw which passes through the wedge and enters the front portion. The wedge includes a front insert-engaging bulge, and a lower heel which contacts the front portion and defines a pivot axis which is located closer to the pin than is the bulge. Upon tightening of the screw, the wedge is (a) pushed toward the insert by the rear portion of the wedge-support surface to push the insert against the pin, and (b) caused to pivot about the pivot axis in a direction producing a slight downward movement of the bulge.

Abstract: A metal cutting insert is made by performing a sintering operation to form a substrate having a longitudinal axis and superhard abrasive bodies bonded thereto at longitudinally spaced locations. The substrate and superhard bodies are sliced-through in directions perpendicular to the axis to form inserts having superhard body portions on both side surfaces of the insert.

Abstract: A cutting insert (3) and a tool (1) for utilizing the cutting insert (3) for chip removal treatment of a workpiece. The cutting insert (3) has two base surfaces (9) and a plurality of side surfaces (13A,13B) which extend between the base surfaces (9). The base surfaces (9) have a trapezoidal shape and the side surfaces (13A,13B) have a rhomboid shape. Each of the side surfaces (13A,13B) has a chamfer (14A,14B) adjacent to one of the base surfaces (9) The edges between adjacent side surfaces (13A,13B) at the location of the chamfers (14A,14B) define main cutters (15). Each of the base surfaces has a conical chamfer (16) at each corner. The conical chamfers (16) define arcuate edges between the base surfaces (9) and the side surfaces (13A,13B) which are smoothing cutters (10A,10B). A plurality of cutting inserts (3) are removable attached to a surface of the tool (1) for engagement against the workpiece. The cutting inserts (3) are attached at a periphery and are rotated about an axis (A) of the tool (1).

Abstract: A screw includes a socket adapted to receive the tip of a screwdriver. The socket is tapered and formed by a plurality of sides interconnected by rounded corners. Each side is configured as a surface of a segment of a cone having a cone angle of at least three degrees. The screwdriver tip is configured correspondingly to the screw socket. The screwdriver may be mounted in a power driven rotary arm and spring-biased, whereby a tightened screw applies a rearward reaction force to the screwdriver, causing the tip to be displaced from the screw socket and thereby limit the torque applied to the screw.

Abstract: A tool component adapted to be connected to another element of a tool assembly includes a rearwardly facing surface and a truncated conical recess extending rearwardly therefrom. The recess is adapted to receive a correspondingly configured projection of the other element. A portion of the rearwardly facing surface defines a support surface engageable with the other element. The recess is non-circular in cross-section so as to be rendered non-rotatable relative to the other element. The recess includes a rearwardly open hole extending along the axis and a threaded fastening bolt disposed in the hole to draw the projection into the recess.

Abstract: This invention relates to sintered ceramic materials in which the densification during sintering takes place with a liquid phase preferably based on silicon nitride. During sintering such materials are often embedded in a powder of inert material such as BN, etc. The invention resides in the fact that by embedding the material to be sintered in a protective powder with a composition similar to that of the intergranular phase, a surface zone with a composition and/or structure different from that of the core can be obtained.

Abstract: The invention relates to a tool components and a method of assembling tool components. One tool component comprises a central recess and a fastener. The recess is non-circular in cross-section. Another tool component has a central projection and a central threaded bore in its axially rear end. The projection is non-circular in cross-section.

Abstract: The invention relates to a tool assembly and a method of assembling the tool. The assembly comprises a machine spindle component and a tool component for chip removal. The spindle component comprises a central clamp and a central recess. The tool component has a central projection and a central threaded bore in its axially rear end. The seat and the projection comprise complementary, non-circular surfaces which are brought against each other during tightening of the clamp. The tightening of the clamp is terminated by the mutual abutment of a front surface of the spindle and an end surface of the tool. The cooperating non-circular surfaces receive moment forces arising during the use of the tool.

Abstract: The invention relates to a sintered body of a ceramic composite material based on alumina, refractory hard phases and ZrO.sub.2, HfO.sub.2 and/or partially stabilized ZrO.sub.2 with a relative density of more than 98%. The sintered body according to the invention has chromium integrated in amounts corresponding to in all 1-20 weight % and ZrO.sub.2, HfO.sub.2 and/or partially stabilized ZrO.sub.2 present as 2-16 weight % with these latter phases present to more than 70% in the tetragonal crystal modification. Furthermore, the refractory hard constituents are present as particles with a grain size of less than 10 .mu.m and/or as whiskers or fibers with a diameter of less than 5 .mu.m and a length/diameter ratio of >10.

Abstract: A cutter (10) intended for use on a planing blade on a road planing machine is provided with a plurality of tools (14) rotatably mounted in the cutter. The tools (14) are mounted side by side and are adapted to carry out the working of the road surface (17).

Abstract: Temperature resistant abrasive polycrystalline diamond bodies are described, intended for use as tools in various mechanical operations like turning, milling, drilling, sawing and drawing, having different additions, i.e. amount and composition, of binding, fluxing, catalyst metals at different distances from the working surface. Preferably the metal concentration of the polycrystalline diamond body is decreasing towards the working surface while the metal composition is varied in a way that gives a mechanically stiffer matrix that also has a lower thermal expansion.In one embodiment the diamond body is high pressure-high temperature-bonded to a supporting body, e.g. of cemented carbide, in order to facilitate the clamping of the tool. In another embodiment the diamond body is brazed to a supporting body or used in a surface-set rock drill bit, i.e. held by a braze metal.

Abstract: A polycrystalline diamond tool comprising a diamond layer is bonded to a support body having a complex, non-plane geometry by means of a thin more than 3 .mu.m continuous layer of a refractory material applied by PVD or CVD technique.

Abstract: Drilling means of the type having a pilot bit, a reamer and a guidemember mounted in the bottom end of the casing tube, and which transmits impacts to the casing. The guide member is snugly enclosed in the thickened mouth portion of the casing tube and has a plurality of channels which are segments of a spiral through which the drilling debris is discharged upwardly to the casing tube.

Abstract: A rotary drill bit comprising a roller cutter (12) which is rotatably carried over a bearing system. The bearing system comprises at least one roller bearing (16). Fluid is supplied to the bearing system for flushing and lubricating and when needed cooling thereof. For purposes of ensuring suitable fluid flow through the roller bearing (16) and thus ensuring satisfactory lubrication thereof the rollers in the roller bearing (16) are provided with an axial bore (25).

Abstract: A roll device includes a roll shaft and at least one roll ring mounted on the roll shaft. A lock means is securable to the roll shaft. A centering element is disposed between the roll ring and the roll shaft to center the roll ring. A first resilient element is axially interposed between the lock means and the centering element. A second resilient element is axially interposed between the lock means and the roll ring. The lock means applies axial force to the first and second resilient elements to position the centering element relative to the roll ring and roll shaft, and clamp the roll ring to the roll shaft for common rotation therewith. The spring rates of the first resilient element can be made less than that of the second resilient element to regulate the relative amount of axial forces applied to these elements.