| 摘要 |
PURPOSE: To suppress positional deviation of an insert by providing a projection in contact with an insert top face and a projection in contact with an insert end face on a wedge. CONSTITUTION: A front part of a wedge 17 has a front extension part provided by a pair of projections 24, 25, and a semicircular recessed part 23 is defined between both projections 24 and 25. Lower sides of a pair of projections 24, 25 are flat faces 24a, 25a to bring them into contact with a top face of an insert 12. The wedge 17 is provided with a pair of second projections 26a, 26b arranged apart at a lower level than a pair of projections 24, 25. A pair of second projections 26a, 26b are flat and are arranged so as to tilt at an obtuse angle corresponding to two contact face parts forming a narrow angle of an insert end face facing them. |
