A method for manufacturing a cutter includes: boring a passage into a polycrystalline superhard cutting head, the passage extending from a front face of the cutting head toward a side thereof; and introducing acid into the passage, thereby removing at least a portion of a metal from the cutting head.

A composite diamond body includes a diamond base material and a stable layer disposed on the diamond base material. The stable layer may have a thickness of 0.001 m or more and less than 10 m, and may include a plurality of layers. A composite diamond tool includes the composite diamond body. There are thus provided highly wear-resistant composite diamond body and composite diamond tool that are even applicable to mirror-finish planarization of a workpiece which reacts with diamond to cause the diamond to wear.

A cutting tool according to an aspect of the present disclosure includes a cutting edge portion which contains at least one of cubic boron nitride and polycrystalline diamond. The cutting edge portion includes a flank face, a negative land contiguous to the flank face, and a cutting edge formed by a ridgeline between the flank face and the negative land. At least one of the negative land and the flank face is provided with a plurality of recesses and a projection. The projection is formed by arranging the edges of adjacent recesses in contact with each other.

A tool insert includes first, second, and third teeth arranged on a surface of the tool insert. The first tooth is arranged at a proximal end of the tool insert surface and has an angled leading end and a first tooth height. The second tooth is spaced from the first tooth by a first distance along the surface of the tool insert and has a second tooth height greater than the first tooth height. The third tooth is spaced from the second tooth by a second distance along the surface of the tool insert and has an extending angled portion. The first tooth forms a first groove in a bore surface. The second tooth increases the depth of the first groove. The third tooth provides at least one micro-scratch to one of the first groove and the bore surface.

The invention relates to a drilling tool (50), in particular a dowel hole drill, for the machining of workpieces, in particular workpieces made of wood, plastics, composite materials, comprising a drill shaft (56) with a front surface (60), and to a drill head (58) with at least one cutting edge (66), which is firmly connected, such as soldered, to the drill shaft (56). In order to make available a drilling tool of the type mentioned at the start, which has a broad range of application and is simple to produce, it is provided that the drill head (58) is formed from a composite material with exclusively two layers (38), namely a hard metal layer (36) and an ultra-hard layer (38) which is connected to the hard metal layer (36) and preferably formed from polycrystalline diamond or polycrystalline boron nitride, that the ultra-hard layer (38) is connected directly to the front surface (60) of the drill shaft (56) and that the at least one cutting edge (66) is formed by the ultra-hard layer (38), and a drill bit (62) such as a centering tip is formed by the hard metal layer (36).

A bonded diamond body having a high bonded strength is provided. The bonded diamond body includes a sintered polycrystalline diamond body, a hard substrate, and a hard layer provided between the sintered polycrystalline diamond body and the hard substrate, the sintered polycrystalline diamond body containing a diamond grain and a sintering aid, the hard substrate containing tungsten carbide and cobalt, and the hard layer containing cobalt and a hard grain made of a carbide, a nitride, or a carbonitride having a Vickers hardness of 1100 Hv or more.

A method for making a polycrystalline diamond compact. The method includes: 1) preparing a workblank of a polycrystalline diamond compact; and 2) thermally- or cold-etching the curved surface of the workblank of the polycrystalline diamond compact using laser. The thermally- or cold-etching the curved surface of the workblank of the polycrystalline diamond compact includes: employing a laser generator to produce a laser beam, expanding the laser beam, focusing the laser beam, to yield an energy concentration area on the surface of the workblank of the polycrystalline diamond compact, and etching the curved surface using the energy concentration area.

A drill bit includes a bit body; a plurality of gouging cutters rotatably mounted to the bit body so as to define a first profile; and a plurality of gouging cutters non-rotatably mounted to the bit body so as to define a second profile. The first profile is longitudinally ahead of the second profile in a direction of drilling of the drill bit by a selected distance.

The invention discloses a wheel machining tool. A rough turning tool and a finish turning tool are respectively arranged on two sides of a tool head, the primary declination angle of the rough turning tool is set to 90 to 120, and the primary declination angle of the finish turning tool is set to 85 to 95; the axial height difference between the rough turning tool and the finish turning tool is set to 0.2-0.5 mm; the distance c between the rough turning tool and the tool head is set to 5-8 mm, and the distance b between the finish turning tool and the tool head is set to 3-5 mm. The rake angle of the rough turning tool is set to 12-15, the rake angle of the finish turning tool is set to 14-17.

A cutting tool comprising: (a) a shank being configured to connect the cutting tool to machine; (b) a body connected to and extending from the shank, the body including: (i) a longitudinal axis; (ii) a plurality of flutes, (iii) one or more pockets located in one or more of the plurality of flutes; (iv) one or more shield substrates located in each of the one or more pockets; and (v) one or more joints connecting the one or more shield substrates to the one or more pockets, the one or more joints including a leading portion; (c) a tip connected to and extending from the body, the tip including a cutting surface that extends radially outward from the longitudinal axis a distance so that a clearance cut by the tip into a substrate is sufficiently large so that the leading portion of the one or more joints extends within the clearance.