CUTTING INSERT FOR TOOLS

PCT No. PCT/EP91/00825 Sec. 371 Date Dec. 24, 1991 Sec. 102(e) Date Dec. 24, 1991 PCT Filed Apr. 29, 1991 PCT Pub. No. WO91/17014 PCT Pub. Date Nov. 14, 1991.A cutting insert (3) and a tool (1) for utilizing the cutting insert (3) for chip removal treatment of a workpiece. The cutting insert (3) has two base surfaces (9) and a plurality of side surfaces (13A,13B) which extend between the base surfaces (9). The base surfaces (9) have a trapezoidal shape and the side surfaces (13A,13B) have a rhomboid shape. Each of the side surfaces (13A,13B) has a chamfer (14A,14B) adjacent to one of the base surfaces (9) The edges between adjacent side surfaces (13A,13B) at the location of the chamfers (14A,14B) define main cutters (15). Each of the base surfaces has a conical chamfer (16) at each corner. The conical chamfers (16) define arcuate edges between the base surfaces (9) and the side surfaces (13A,13B) which are smoothing cutters (10A,10B). A plurality of cutting inserts (3) are removable attached to a surface of the tool (1) for engagement against the workpiece. The cutting inserts (3) are attached at a periphery and are rotated about an axis (A) of the tool (1).