Cutting tool

摘要

An indexable insert (1) according to the present invention has a base (3) and a stick-shaped portion (7) which are integrally formed. The base (3) comprises a bottom surface (3a) placed on a seating surface (12) of a holder (9) and a first side surface (3b) and a second side surface (3c). The indexable insert (1) is attachable such that backlash is prevented by cramping the first side surface (3b) and the second side surface (3c). A cutting edge (5) and a rake face (6) are provided at a front end of the stick-shaped portion (7), and one side surface of the stick-shaped portion (7) is a side relief face (7a) and connects with the base (3) with no step. Accordingly, cutting chips are satisfactorily removed. A cutting tool (8) according to the present invention constrains the indexable insert (1) by a first cramp side surface (11a) and a second cramp side surface (11b). Side surfaces (3b and 3c) of the base (3) of the indexable insert (1) are cramped at four points by a projection (11c) at a front end of the first cramp side surface (11a), two projections (11c) at a front end and a rear end of the second cramp side surface (11b), and a set bolt (B) at a rear end of the first cramp side surface (11a). Accordingly, neither backlash nor chatter vibration is produced in the indexable insert (1) attached to the holder (9) during cutting processing.