Cutting insert having clamping surfaces

摘要

The present invention discloses a cutting insert which can be produced by grinding only side faces after a press process. A cutting insert according to the present comprises a substantially rectangular parallelepipedal base body formed with a front face, a rear face, an upper face, a lower face, and two flank faces, the front face and the rear face pierced by a central fastening hole extending in a longitudinal direction. The cutting insert according to the present, cutting edges are formed at the boundary between the upper face and the lower face, and the two flank faces; the cutting edges are slanted from the front face toward the rear face to provide a positive lateral rake angle (ß); the upper face and the lower face are provided with chip forming grooves adjacent and along the cutting edges so that the cutting edges have a positive cutting angle (a), the upper face and the lower face are provided with two clamping surfaces each formed over at least strip areas covering the longitudinal median line spanning the front face and the rear face, and the two clamping surfaces are flat and parallel, and facing away each other; and transitional portions are provided between the chip forming grooves and the clamping surfaces so that chips generated in the chip forming grooves are slid and evacuated smoothly thereover.