Kennametal Inc.

Earl L Griffin

Kenneth L Niebauer

Kenneth G DeRoche

Edmund Isakov

Scott W Vogel

James G Hutchens

Mark F Huston

An indexable cutting insert for use with a cutting tool includes an insert body having a first surface and a side relief surface defining a cutting edge adjacent the intersection of the first surface and the side relief surface. A chip breaking structure is interposed between the first surface and the cutting edge. The chip breaking structure includes first and second series of wedges. Each series of wedges is disposed inwardly from the cutting edge and the wedge series are disposed in orthogonal or normal relation to one another. In a preferred arrangement, the narrow edges of the first and second series of wedges are aligned with one another.

Indexable insert with a V-shaped chip breaker

A cutting insert for use in a rotary milling tool is provided. The cutting insert includes an insert body including a bottom face, a top face, and a side face. A stepped cutting edge is formed at the intersection of the top face and the side face for engaging a workpiece and removing a chip from it. The stepped cutting edge includes at least two offset edge portions which produce distinct, transversely-spaced chip segments during the cutting operation. The offset edge portions are connected by transition edge portions which are disposed at an obtuse angle with respect to the offset edge portions. The angle of the transition edge portions tends to spread the individual chip segments apart during the machining operation to effect a thinning of the chip between the individual chip segments. The entire cutting edge is helically curved so that the cutting edge lies on the surface of a circumscribing cylinder defined by the rotation of the cutting edge about the axis of the milling cutter.

Helical cutting insert with offset cutting edges

Cutting tool insert

Chip control insert

Growing community of inventors

Flower Mound, TX, United States of America

Earl L Griffin