| 摘要 |
A throwaway tip and a shank both for use in ball end mills, wherein the tip is a throwaway tip of an approximately flat plate-shape, provided at its side face with a convex cutting edge starting from the center portion when viewed from the bottom and a straight-lined cutting face following thereafter, the ridgeline of these cutting edges being formed connecting a bottom face cutting edge, a circumferential side cutting edge, and a top face cutting edge when viewed from the top. Adjoining the top face cutting edge is an inclined fixing side face for use in preventing the tip from floating up. The shank which is to bear the throwaway tip is provided with an inclined tip-fixing wall corresponding to the above-mentioned fixing side face of the tip.
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