A TURNING METHOD FOR A CNC-LATHE AND A TURNING TOOL

摘要

A turning method for a computerized numerical control lathe comprising the steps of: providing a turning tool (1) comprising a cutting portion (2), the cutting portion (2) comprising a first nose portion (10), the first nose portion (10) comprising a first cutting edge (11), a second cutting edge (12), and a convex nose cutting edge (13) connecting the first and second cutting edges (11, 12), wherein the first and second cutting edges (11, 12) are straight or substantially straight in a top view; providing a metal work piece (31); rotating the metal work piece (31) around a work piece rotational axis (R2); making a first pass (36) such that the first cutting edge (11) is active and such that the second cutting edge (12) is inactive, such that a first machined surface (38) is generated by the convex nose cutting edge (13), and such that during at least a portion of the first pass (36), an entering angle (K) and an angle (β) which the first cutting edge (11) forms in relation to the work piece rotational axis (R2) simultaneously varies.