Abstract: A cemented carbide tip is provided with a socket for mounting onto the steel shank of a cutter bit. The socket has an annular convex surface therein extending from the earth engaging portion of the tip radially inwardly and forwardly. This convex surface is brazed to the forward end of a steel shank to form a cutter bit.

Abstract: A tool for generating a prescription surface in a plastic eyeglass lens. A pair of replaceable, cutting elements are mounted on a tool having a spindle. Each cutting element has a solid polycrystalline diamond material forming a cutting edge for progressively shaving a surface on the backside of the lens as the tool is swing back and forth. The surface so generated need only be polished, without the conventional abrasive finishing steps.

Abstract: A diamond-clad machining tool is prepared by the steps of (a) forming a film of diamond of 10 to 1000 .mu.m thickness by the method of vapor-phase deposition on the surface of a temporary substrate of, e.g., silicon, (b) bonding the diamond film as borne by the temporary substrate to the surface of a base body of the tool by brazing and (c) removing the temporary substrate, e.g., by grinding to leave the diamond film bonded to the base body of the tool by brazing. The method is advantageous in the versatility in respect of the material of substrate on which a diamond film is deposited from the vapor phase as well as in the firmness of bonding between the cladding layer and the base body of the tool in comparison with the conventional vapor-phase deposition method of diamond directly to the surface of the base body of a tool.

Abstract: Cutting insert for chip-removing machining comprising an upper face (11), a lower face (12) and, connecting those, edge surfaces (13). Lines of intersection between the edge surfaces and the upper face form cutting edges. The insert (10) has a substrate (14) comprising a metal and a photon-emitting material. The substrate (14) is covered by a photon-tight layer (15). During wear of the layer (15) the substrate (14) is exposed, and therefore the intensity and direction fo the photons can be detected for determination of the size and type of the wear damage.

Abstract: A drill bit tip construction wherein the cutting edge at the tip of the drill bit is arranged to cause fragmentation of the chips being removed from the work metal during the drilling operation. The cutting edge of the drill bit at the drilling tip is made to be wavy and, in the illustrated embodiment, is defined by a plurality of segmentally cylindrical grooves extending parallel to the longitudinal extent of the flutes at the tip. In the illustrated embodiment, the grooves have a radius of approximately 0.05" and a length substantially greater than the radius to permit repeated resharpening of the drill bit with resultant reforming of the desired wavy cutting edge in the resharpened tip. In the illustrated embodiment, the cutting edge is formed in an insert secured as by brazing in a diametric slot at the tip. The insert may be formed of a carbide material having optimum cutting characteristics. The grooves are provided in the insert by use of an electric discharge wire cutting machine.

Abstract: For machining the tooth flanks of a hardened workpiece having pre-formed teeth two cutting blades or plates are secured to a cutting blade or plate holder. The cutting blades or plates are provided with a base member or backing formed of a hard metal and a cover layer sintered thereon which is formed of cubic boron nitride. Each cutting blade forms a cutting surface and a clearance surface. Each individual cutting blade or plate is arranged at the cutting blade or plate holder in relation to the direction of the intended cutting movement such that the surface of the cover layer forms the clearance surface and an end face or surface of the cover layer is located in the cutting surface. Consequently, there is achieved the result that the cutting surface can be reground in the same manner as tools which, for example, are made of hardened steel and which are not provided with a cover layer.

Abstract: A cutting element for use in rotary drill bits comprises a generally cylindrical stud and a cutting disk bonded to a supporting surface of the stud. The supporting surface intersects a cylindrical side surface of the stud to form an edge. The supporting surface includes a plurality of alternating projections and grooves extending in a front-to-rear direction of a supporting surface. The projections and grooves include rear ends terminating short of the edge to minimize the formation of stress cracks in the edge.

Abstract: A cutting tool comprised of a polycrystalline layer of diamond or cubic boron nitride integrally adhered to a recessed edge portion of a cemented carbide substrate structure, said layer having a tool nose of a given radius joining two substantially straight cutting edges, a face of said layer being adhered to the bottom surface of the recessed portion and a round side of the layer being adhered to the wall of the recessed portion, the thickness of the polycrystalline layer and the height of the wall being substantially equivalent.

Abstract: A cutting tool for a mining machine of the type used for cutting soft materials such as coal. The cutting tool has a holding lug 10 and a cylindrical pin 18 located in a socket in the holding lug and presenting a cutting edge or surface in the form of an abrasive compact 26. The pin 18 is secured in the socket by means of a non-metallic adhesive or soft solder and a body 38 located in a cavity formed by co-operating and aligned grooves 32, 34 formed in contacting surfaces of the pin and a side of the socket. The body 38 in the cavity serves to restrain the pin against rotational movement in the socket.

Abstract: A material removing tool wherein a substantially plate-like support of steel carries at least one annular cutter which is made of a harder metallic material capable of being soldered to the material of the support. The support has a centrally extending projection which is received in a complementary opening of the cutter, and the cutter has two or more substantially radially extending webs in register with grooves which weaken the cutter in the regions of the webs so that at least one of the webs breaks in response to soldering of the cutter to the support. The breaking of one or more webs is promoted by proper selection of the thermal expansion coefficients of the materials of the support and cutter. The provision of breaks in the webs, either as a result of bonding or as a result of utilization of cutter sections, ensures that each cutter section between two neighboring webs can be put to use independently of the condition of the other section or sections.

Abstract: This invention relates to a tool for use in carrying out a cutting process, and more particularly to a cutting tool formed so that it can be sued to cut an iron material of a high hardness and thereby obtain a mirror-polished surface thereon, the cutting tool being characterized in that it is formed by attaching a monocrystal of boron nitride to the tip thereof so that predetermined surface and orientation of the crystal are set suitably. To be concrete, the present invention is directed to a cutting tool in which monocrystalline boron nitride is used for a tip which forms a blade of the cutting tool, (111) surface of this boron nitride being used as a relief surface of the blade, <211> direction being used as a cutting direction; or a cutting tool of the same material, in which (100) surface of the boron nitride is used as a relief surface of the blade, <110> direction being used as a cutting direction.

Abstract: A polycrystalline diamond body with a plurality of faces having enhanced surface irregularities over at least a portion of at least one of the faces is disclosed. The polycrystalline diamond body with the enhanced surface irregularities attaches to other materials such as metal by conventional mounting techniques. The polycrystalline diamond bodies of this invention are without a carbide or metal backing. The pattern forming the enhanced surface irregularities of this invention can be predetermined or random. Similarly the pattern can be randomly distributed on the surface or positioned in a repeatable pattern. It is therefore not necessary that the surface irregularities be uniform in either shape or size. One method of forming the enhanced irregularities is during the press cycle during which the polycrystalline diamond is formed with screens, molds, or free standing bodies.

Abstract: A diamond tool comprises a diamond (4) with a cutting edge (5) which diamond is encased in a sinter mass (7) which is brazed to the front end of a tool shank (1). The diamond (4) is brazed to a metal connection block (6) which is encased in the sinter mass (7) together with the diamond.

Abstract: A sintered polycrystalline diamond compact having an integral metallic heat sink bonded to and covering at least the outer diamond surface is used to increase compact life when the compact is used for material removal without a fluid coolant.

Abstract: A cutting insert is provided with a core having upper and lower surfaces and a recess in the upper surface. Crystal portions containing a dispersion of super-hard crystals are disposed at predetermined locations on the periphery of the upper surface of the core outside of the recess, and a layer of metal is bonded to the upper surface of the core inside the recess. The layer of metal extends upwardly beyond the upper surface. The layer of metal is provided to produce highly parallel upper and lower surfaces of the cutting insert in order to facilitate the mounting of the insert into a cutting body. The layer of metal further functions to absorb shock during a cutting operation.

Abstract: A belt cutting apparatus and method of making same are provided for cutting a non-contoured and cured polymeric belt sleeve to define an endless power transmission belt construction having at least one pair of opposed non-parallel side portions wherein such apparatus utilizes a rotatable cutting instrument comprised of a rotatable support body having a central axis, at least one rake-like cutting bar having an elongate axis and having cutting means provided thereon as an integral part thereof with the cutting means providing the belt construction, and means supporting the bar on the body with its elongate axis parallel to and radially spaced from the central axis and wherein the cutting means extends perpendicular to the elongate axis.

Abstract: An insert for a rotary type drag bit having two anchored components, an engaging element and a shank, is disclosed. The components are positioned into each other in interfitting relationship with the mating surfaces of the two components being at a non-perpendicular angle to a plane parallel to the front of the engaging element. This insert can then be placed into a receiving feature on the crown of a drill bit. The resulting engaging element to shank interface enables the forces encountered during drilling to be distributed over a larger surface area than conventional flat-on-flat two component attachments so that the bond is less likely to break. The effect of the drilling forces on the engaging element to shank interface is also reduced as the shearing forces are diminished and resolved into compressive forces and the shank provides a support for the interface bond against any remaining shearing forces.

Abstract: Wear-resistant and shock-resistant tools are constructed by preforming carbide-containing working parts of high wear resistance and hardness and attaching them to a softer base metal of the tool by means of a highly shock-resistant steel-to-steel fusion weld. The working part is preformed by powdered metallurgy techniques utilizing steel powders having carbide-forming constituents therein which form carbides along the grain boundaries of the steel uniformly throughout the working part as a result of sintering of the compressed powders. Thereafter the fusion welding process renders the carbide structure of the working part nonuniform for optimum shock resistance, without reducing the effective wear resistance thereof, while also forming a highly shock-resistance joint between the working part and the base metal of the tool.

Abstract: A method of making a cutting member and article produced thereby includes a cutter body having a recess and a coaxially aligned elongated shank with an annular gap defined between the cutter body recess and a portion of the shank extending thereinto, such recess being filled by injection with molten metal.

Abstract: A cutting tool having a high wear resistance is disclosed. The cutting tool consists of a plate-shaped body comprising a sintered cermet layer and a sintered body layer containing high density boron nitride or diamond, said sintered cermet layer constituting the center portion of the plate-shaped body and being surrounded and adhered at the side surface or at the side surface and upper and lower surfaces with the sintered body layer.

Abstract: A drill assembly comprising a tool bit of the type including a slot at one end for receiving a cutting element. A positioning clip removably disposed in the slot and having a cutting element engagement structure for maintaining the position of the cutting element within the retainer clip, and drill body engagement structure for locating and maintaining the position of the clip within the slot of the tool bit.

Abstract: A novel shock mounting is disclosed for ultra-hard crystalline materials. When used as a drill bit, the crystalline materials last much longer as cutting elements when mounted according to the present invention.

Abstract: A grinding wheel dressing tool having a dressing edge consisting essentially of a side dressing edge angle ranging between 30.degree. and 75.degree. wherein the side dressing edge is at least about 0.5 millimeter in length, an end dressing edge angle between 5.degree. and 30.degree. wherein the end dressing edge is at least about 0.5 millimeter in length, and a straight secondary dressing edge of at least 1 millimeter in length joining the side and end dressing edges, said dressing edge having a lip angle ranging from 90.degree. to 120.degree., and engaging the periphery of a rotating grinding wheel with said dressing tool at a negative side rake angle ranging from -5.degree. to -35.degree..

Abstract: A grinding wheel dressing tool having a dressing edge consisting essentially of a side dressing edge angle ranging between 30.degree. and 75.degree. wherein the side dressing edge is at least about 0.5 millimeter in length and an end dressing edge angle between 5.degree. and 30.degree. wherein the end dressing edge is at least about 0.5 millimeter in length, said dressing edge having a lip angle ranging from 90.degree. to 120.degree., and engaging the periphery of a rotating grinding wheel with said dressing tool at a negative side rake angle ranging from -5.degree. to -35.degree..

Abstract: A self renewing working tip tool characterized by a plurality of working tip surfaces on individual laminae assembled in nested relation. The laminae are of hardened steel and each has a hard metal carbide coating thereon. A series of such laminae are bonded together and secured to a suitable tool shank to form a tool useful in breaking concrete, mining coal, and the like, where a hard working surface is required. These tools have an extended working life compared to conventional embodiments.

Abstract: A disc body portion is grooved diametrically in one end face to receive differently profiled spindle turning bits and the body portion has a central axial threaded bore to accept a bolt serving as a temporary handle to hold the cutting bits in contact with a grinding wheel to sharpen them. The unitized disc body portion and bits are held clampingly during use between two body members of a bar-like rockable wood lathe cutting tool with the threaded securing rod of such tool passing through the threaded bore of the disc body portion.

Abstract: A cutting tool with a holder and a removable insert that has a flat positioning surface and a cutting edge located in the plane of said surface. The insert is carried in a slot of the holder, with the positioning surface of the insert clamped against a locating surface of the holder that in part forms the slot. The locating surface of the holder orients and locates the insert and, hence, the cutting edge in a plane that remains unchanged after the cutting edge is sharpened by grinding and lapping the positioning surface of the insert. Where the cutting edge is formed in a tip or bit of diamond or other cutting material different from the insert, the tip or bit need not be removed from the insert and reset for grinding or lapping. In use, the insert is clamped to the holder intermediate its ends and contact with the locating surface is restricted to spaced areas on opposite sides of a clamping screw.

Abstract: The rock cutting tip insert of a rock cutting tool comprises two layers, the front layer being harder than the backing or base layer by at least one hundred units on the Vickers Hardness scale.

Abstract: A cutting tool, preferably in the form of a cutting insert of hard material, having a narrow land area or ledge along the cutting edge, and a top surface recessed below the ledge, the recess being deep enough to cause a continuous chip cut from a workpiece by the cutting edge to naturally flow into the recess without interference such as to promote the formation of a false cutting tip build-up during use of the cutting tool, the cutting tip build-up resulting from the transfer of material from the chip to the ledge surface. The invention further contemplates favoring the formation of cutting tip build-up by forming the ledge with a concave section and, in addition or in the alternative, by providing a plurality of diamond particles embedded in the ledge surface at least at the cutting tip of the tool.

Abstract: The invention disclosed pertains to improved raker and low teeth for use in circular saw blades. Each raker tooth includes a leading face and a top portion. The leading face comprises a first and second planar surface wherein the second surface extends at a negative angle from the first surface and to the top that consists of five facets in which two pairs of facets lie in planes offset at a first and second angles from the plane of a first center facet. Each low tooth also includes a leading face and top portion. However, the leading face includes a first planar surface and a second portion consisting of five facets each of which extends from the first surface to the top portion at a negative angle of inclination, and two pairs of facets lie in planes offset at first and second angles from a first center facet.

Abstract: A multiple cutting plate for metal peeling machines in which a steel block of octagonal prismatic cross section is adapted to receive two spacedly arranged cutting blades, by means of brazing, with each blade forming a main and a secondary cutting edge and a chip deflecting step being provided on at least one main cutting edge.

Abstract: A rotary drill bit for rock drilling comprising a plurality of cutting elements mounted by interference-fit in recesses in the crown of the drill bit. Each cutting element comprises an elongated pin with a thin layer of polycrystalline diamond bonded to the free end of the pin.

Abstract: A cutting tool for machining the outer surfaces of elongated workpieces such as wire, rod or pipe has main and secondary cutting edges intersecting one another at an included obtuse angle and the secondary cutting edge is substantially longer than the main cutting edge.

Abstract: A removable cutter tooth for use with a cylindrical tooth carrier is herein disclosed. The removable cutter tooth has an elongated base. A thrust pin is formed integral with, and perpendicular to, a portion of the elongated base. A rib is also formed integral with the elongated base. A cutting insert is connected to the elongated base and to the rib.