| 摘要 |
PROBLEM TO BE SOLVED: To provide a spinning machine which can carry out plastic working without causing burrs at a groove portion to be formed on the external peripheral surface of an opening side end portion. SOLUTION: In the spinning machine composed of a main spindle 2 having a chuck 21 for gripping the external peripheral surface of a cylindrical blank material W with a bottom, and pressing rollers having a stepped projection "a" for forming the groove portion on the end portion of the blank material W, the pressing rollers are composed of a first process pressing roller R1 connecting a large diameter peripheral surface portion a1 with a small diameter peripheral surface portion a2 of the stepped projection "a" by a tapered surface K, and a second process pressing roller R2 for forming a final shape. COPYRIGHT: (C)2007,JPO&INPIT
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