| 摘要 |
PURPOSE:To machine a crank shaft in single process by separating the center line L2 of a rotary tool from the center line L1 of a crank pin in the drank shaft, then moving the rotary tool until the center lines L1 and L2 are aligned, thereafter performing the cutting by means of an arced cutting edge. CONSTITUTION:A rotary tool 10 is advanced with the center line L2 thereof being set off by a distance (a) from the center line L1 of a crank pin, and stopped when a desired diameter thereof is obtained. Then the rotary tool 10 is fed downward until the center lines L1 and L2 are aligned. During this motion, the opposite end sections of the linear section of the crank pin, the arced portions and the shoulder portions 7 are cut by means of an arced cutting edge 3 and a shoulder cutting edge 14.
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