A cutter comprises a superhard construction, the cutter having a cutting edge defined by a rake face, and a flank extending therefrom. The cutter also has first and second regions, the first region abutting the second region along a boundary, the first region having a different material composition from the second region. At least the second region comprises superhard material, the material of the first region has a different coefficient of thermal expansion (CTE) from the material of the second region. The second region extends around the peripheral edge of the first region defined by the boundary to form a collar therearound, the first region and/or the second region extending to and/or forming at least a part of the rake face.

The invention relates to an interchangeable cutting insert (10) having a shank (12), which transitions into a cutting head (14), which has a chipping surface (32), which, when viewed from above, is a segment of a circle with a height greater than the radius of the chipping surface (32), wherein the chord of the segment of a circle constitutes the transition to the shank (12), wherein a cutting edge (30) is formed on the outer edge of the chipping surface and multiple chip-breaking structures (36, 38) are provided on the chipping surface (32), the chip-breaking structures having depressions (36) in the chipping surface (32), between which projections (38) are arranged, which protrude beyond the chipping surface (32).

An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact having a thermal conductivity within the range of 20 to 70 W/m.Math.K and including cubic boron nitride particles having an average particle diameter within the range of 0.5 m to 2 m; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.

A power skiving tool includes a basic body, which is equipped with a plurality of replaceable cutting inserts, by means of which chips can be carved or peeled out of a workpiece with the purpose of forming, for instance, teeth. The individual cutting insert is formed with only one cutting edge) and has a rear end in the form of a shoulder surface, against which an adjusting mechanism is pressed for the fine adjustment of the radial position of the cutting insert in relation to the basic body. On the underside of the cutting insert, there is in addition a control means, e.g. a serration connecting surface, which interacts with the corresponding control means in the appurtenant seat in the basic body. In addition, the invention concerns a power skiving cutting insert as such.

A cutting insert includes an insert body, a rake face on an upper surface of an end portion of the insert body, a cutting edge on a ridge between the rake face and an end surface of the insert body, side cutting edges on ridges between the rake face and side surfaces of the insert body, each connected to both end portions of the cutting edge, and a breaker convex portion on the rake face. The breaker convex portion includes two breaker island portions extending toward the side cutting edge as extending closer to the front cutting edge. Each breaker island portion includes from the front cutting edge side a first raised portion, a descending portion which becomes lower from a top portion of the first raised portion, and a second raised portion which becomes higher, from the descending portion, than the top portion of the first raised portion.

The present invention provides a more practical hard-coated cutting tool having improved cutting performance during finishing so as to obtain a better finished surface. Provided is a hard-coated cutting tool including a tool body (7) coated with a hard coating (4) and having a cutting edge (3) formed on a ridge line intersecting a flank face (1) and a rake face (2). In the hard-coated cutting tool, the thickness h1 of the hard coating (4) on the flank face (1) side and the thickness h2 of the hard coating (4) on the rake face (2) side near the cutting edge (3) satisfies conditions 8 mh130 m and 0h2/h10.5 in a cross-section perpendicular to the cutting edge (3) in a range equal to or less than 0.3 times the tool diameter in the axial direction from the tip of the tool.

A method for forming a stand-alone wafer or a coating on a substrate uses a composite of cubic boron nitride (cBN) particles and other materials, such as nitrides, carbides, carbonitrides, borides, oxides, and metallic phase materials. The wafer or coating may be formed of a thickness up to about 1000 microns for improved wear life. The density of material within the wafer or coating may be varied according to desired parameters, and a gradient of particle sizes for the cBN may be presented across the thickness of the material.

An indexable milling cutting insert includes an opposed outside and inside, a periphery, and a plurality of homologous and alternately individually usable cutting edges, which are equidistantly spaced apart from a center axis, which extends between the outside and inside. The cutting insert includes a plurality of countersunk chip channels, which are delimited by bottoms and tangentially spaced-apart ridges, which individually include a cutting edge formed between a chip surface included in a first chip channel, and a clearance surface, which borders on a second chip channel.

A cutting tool comprising a holder (12) having a slot-shaped, arcuate receptacle (16), with respectively a lower and an upper bearing surface (36, 38) attached to rigid clamping jaws (18, 20) of the holder (12), for the reception (16) of a cutting insert, (14) and a cutting insert (14) having an arcuate shank (22) with lower and upper locating face (32, 34), which cutting insert is arranged exchangeably in the receptacle (16), and having a cutting head (24) with cutting edge (26), which cutting head is disposed on a workpiece-side end (44) of the shank (22), wherein the arcuate receptacle (16) and the arcuate shank (22), measured respectively on the lower bearing surface (36) of the receptacle (16) and the lower locating face (32) of the cutting insert (14), extend respectively over at least 90, wherein the receptacle (16) extends over a larger angular range than the shank (22) of the cutting insert (14), and wherein the shank (22) is held in the receptacle (16) such that the holder-side end (28) of the shank (22) is distanced from the holder-side end (30) of the receptacle (16).

A cutting tool formed by a coating layer on a substrate has cutting edges that feature serrations. The linear dimensions of the serrations may vary from a few nanometers up to 10 microns. The serrations result in a smoother cut edge on the workpiece, particularly when the workpiece is formed of certain materials that are seen as particularly difficult to cut, such as hardened steels.