Abstract:
Es wird ein Schneideinsatz (1) zur zerspanenden Bearbeitung von Werkstücken bereitgestellt, mit: einer Schneidkante (40) und einer daran angrenzenden Spanfläche (41), die durch eine ultraharte Schicht (4) aus Diamant oder kubischem Bornitrid gebildet sind. In der Spanfläche (41) ist eine als Vertiefung in der ultraharten Schicht (4) ausgebildete Spanleitstufe (44) vorgesehen. Auf der von der Schneidkante (40) abgewandten Seite der Spanleitstufe (44) ist ein spanbeeinflussendes Element (5) aus einem harten Material angeordnet ist, das über die Oberfläche der ultraharten Schicht (4) hervorsteht. In einer von einer Schneidecke (42) zu einem Zentrum (Z) des Schneideinsatzes verlaufenden, radialen Richtung ist das spanbeeinflussende Element (5) von der Spanleitstufe (44) beabstandet angeordnet.
Abstract:
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.
Abstract:
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.
Abstract:
The invention relates to an indexable insert having a first and a second insert surface (10a, 10b), three side faces (11, 12, 13) and a cutting projection (2), wherein the cutting projection (2) comprises at least one first and one second cutting tooth (21, 22), cutting edges (31, 32) are formed on the cutting teeth (21, 22) at a transition region to the first and the second insert surface (10a, 10b), respectively, a first chip flow direction (A1) assigned to the first cutting edge (31) forms an angle with a second chip flow direction assigned to the second cutting edge (32), a first and a second chip breaker surface (41, 42) are assigned in the chip flow direction to the first and the second cutting edge (31, 32), respectively, the chip breaker surfaces (41, 42) comprise at least one first and one second groove, respectively, on the first and the second insert surface (10a, 10b) which extend essentially perpendicularly to the respective chip flow direction (A1). The invention also relates to a tool comprising an indexable insert and to a method of producing the same.
Abstract:
A metal cutting insert having a pair of cutting portions disposed on either end of a shank portion, each cutting portion having a front clearance face, the upper boundary of which defines a cutting edge. A pair of spaced apart chip breaking surfaces commence at or near the cutting edge and extend away from the cutting edge. A pair of secondary chip breaking surfaces are located downstream of the first chip breaking surfaces and are interconnected with associated first chip breaking surfaces by transition surfaces. A center channel is located between the chip breaking surfaces and include an entry portion that commences near or at the cutting edge. The first chip breaking surfaces impart an initial curl to a chip as it is cut from a rotating workpiece, while the channel causes rigidizing of a central portion of the chip. The secondary chip breaking surfaces impart a further curl to the chip so that a curl diameter of the chip is reduced. A tool holder for securely mounting metal cutting inserts includes a base and clamping arm which together define a gap for receiving one of the cutting portions of the insert. The tool holder includes first and second planar abutment surfaces. One of the abutment surfaces is intended to confrontingly engage a locating surface defined an a cutting portion having a cutting edge with a non-zero lead angle; the other of the abutment surfaces is intended to confrontingly engage a locating surface defined by a cutting portion having a cutting edge with a substantially zero lead angle.