| 摘要 |
The invention relates to a turning insert, a tool part, a method and a machine tool for chip-cutting metal machining of a workpiece (3). The workpiece rotates in a first direction of rotation (R) at a first speed of rotation around a workpiece axis (C1). The turning insert (9) comprises a front surface, an envelope surface and a circular cutting edge located where the front surface meets the envelope surface. The cutting edge extends around the front surface and is lying in a plane that forms an angle ± with the envelope surface. A tool axis (C2) extends through the turning insert in a normal direction in respect of said plane. The turning insert is, during the chip-cutting metal machining, formed to rotate around the tool axis (C2) at a second speed of rotation. The envelope surface forms a chip surface and is arranged to meet chips formed in the chip-cutting metal machining. The chip surface comprises chip breaking means. |
