| 摘要 |
<p>A throw-away tip (1) has cutting edge (5) being so tilted as to place a height from a position of the bottom surface (3) of the tip higher on the side of a cutting edge portion than that on the side of a base portion for forming a tilted surface (2a) descending from the cutting edge portion to a center portion. Flank surfaces (6) on side surfaces along the cutting edge portion is convex arc-shaped surface bulging outwardly from a perpendicular line extended from a peak of the cutting edge to the bottom surface position of the tip on the side of the cutting edge portion of the cutting edge, at least on the side of the cutting edge portion, and continuously and gradually inclined toward inside of the tip from the perpendicular line from the side of the cutting edge portion to the side of the base portion. In the position installed on a throw-away type cutter (10), the throw-away tip forms large positive angles of axial rake angle and radial rake angle to certainly provide high cutting ability, high strength of the cutting edge and high fixing strength onto a cutter body. The tip permits increasing of rigidity of the cutter body by mounting at high axis position. Also, the tip facilitates production. <IMAGE></p> |
