| 摘要 |
PURPOSE: To keep the insert fastening force by directing a contact area between a first insert surface of a wedge-shaped body part of an insert and a first surface of a tool jaw to the middle of a contact area between a second insert surface and a second surface of the jaw which are longitudinally divided. CONSTITUTION: A rear end part 10 of a first insert surface 9 of a wedge-shaped body part of a cutting insert 1 is narrow, and a second insert surface 6 is divided into a recessed central area 6c and front and rear areas 6a, 6b. The insert 1 is pushed into a slot 16 of a tool holder blade 15, the first insert surface 9 is brought into contact with a longitudinal jaw 17 of a fastening jaw 19, and the front and rear surfaces 6a, 6c of the second insert surface 6 are brought into contact with a longitudinal jaw 18 of a fastening jaw 20 and forced in. At this time, the force F1 applied to the fastening jaw 19 is regulated to the medium between two fastening forces F2 , F3 applied to the fastening jaw 20 so that the fastening force can be strongly kept. |
