Sandvik Ab

Sandvik Aktiebolag

Santrade, Ltd

Jorgen V Wiman

Sture Muren

Robert Isaksson

Jan-Olof Olsson

Lars T Pettersson

Anders Jonsson

Ingrid Reineck

Lars-Erik Gustafsson

Jan Lundstrom

Jonas Naslund

N Gunnar Brandt

Lennart Bystrom

Cutting insert

Turning insert

Cutting insert having a micro ridge chip breaker

A metal cutting insert is directly mounted on a support surface formed either by an insert holder, or by a shim interposed between the insert and insert holder. The insert includes a bottom surface having grooves and planar surface portions disposed between the grooves. The support surface includes ribs which fit into respective grooves of the insert. Some of the planar surface portions of the insert bear against a planar, rib-free portion of the support surface.

Fastening arrangement for cutting inserts and a cutting insert intended

The presently claimed invention discloses a compound body of a wear resistant substrate with a surface coating, which body is suitable for wear parts and tools applications. The body includes top and bottom surfaces and at least one peripheral wall extending therebetween, the intersection of said peripheral wall and at least said top surface forming a cutting edge. The surface coating on said body is a diamond coating of a thickness of 1-30 .mu.m deposited directly from the gas phase in a reactor by CVD or PVD technique in a manner so as to ensure rigid bonding to said carbide substrate. The top face is provided with an integral chipformer so as to provide chips formed during machining into a desired and controllable configuration.

Diamond coated body

An indexable cutting insert for metal machining, in particular turning, is formed with banana- or C-shaped protrusions (11) adjacent to each operative cutting corner. The concave side of the protrusion faces in a direction towards the cutting corner. In comparison with corresponding inserts without such a protrusion a better chip control is achieved. Thus, the chip flow is led away from the machined surface both at small and large cutting depths and the chips are broken into suitable lengths.

Cutting insert with chip control protrusion on a chip surface

A turning insert includes corner surfaces each defined by at least five circle segments arranged in succession between adjacent side surfaces. Successive ones of the circle segments have different radii of curvature. The segments include a center or first segment intersected by a bisector of the corner surfaces, second and third segments disposed on respective sides of the first segment, and third and fourth segments disposed adjacent respective sides of said second and third segments, respectively. The first segment defines a first radius. The second and third segments defining equal second and third radii. The fourth and fifth segments defining equal fourth and fifth angles. Each of the fourth and fifth angles is larger than the first radius. The first radius is larger than each of the second and third angles.

The present invention provides an indexable insert for grooving operations, the basic form of which is triangular, the insert comprises extensions in each cutting corner. Each extension has a cutting edge which intersects with two converging edges. The extensions may have a symmetrical or non-symmetrical configuration. The top surface of the extension provides a rake face in regard to the cutting edge and a clearance face of the cutting edge is oriented in the direction of the thickness of the insert.

Cutting insert for grooving operations

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Sandviken, Sweden

Jorgen V Wiman