| 摘要 |
The insert has a polygonal body(51) with its top and bottom faces joined by a peripheral wall(57) having rounded corners(59). At least two angularly related cutting edges(61) are formed at the juncture of at least one face with the peripheral wall. At the inner edge of each land area(63), located behind each cutting edge, is a descending wall. In the area of the corner, a secondary land area(67) is formed. It joins the inward edge of the descending wall(66) and extends inward toward the center of the polygonal body. The width of this secondary iand is at a max. in the corner and dereases as it extends away from the corner area. A secondary descending wall(69) is joined to the inner edge of the secondary land area. |
