| 摘要 |
PROBLEM TO BE SOLVED: To index gear teeth on a work while suppressing the deformation of the material of the work. SOLUTION: A lathe supports the work 22 using a supporting section 13 when indexing gear teeth. A support portion 31 for supporting a shaft section 43 from the direction opposite to the direction in which a shaft section 43 is cut by a cutting tool 51 and a support portion 32 for supporting a shaft section 44 from the same direction are formed at the end of the supporting section 13. A recess 33 for preventing the supporting section 13 from being cushioned on an indexed-tooth section 42 is formed between the supporting section 13 and the support portion 32. The lathe performs a gear-tooth indexing by the cutting tool 51 while supporting both shaft sections formed on both sides of the indexed-tooth section 42. Since the gear-tooth indexing is performed while supporting the shaft sections arranged continuously with both ends of the indexed-tooth section 42, a gear with constant outer tooth diameter and constant groove width can be cut by suppressing the deformation of the work 22 due to a cutting load. COPYRIGHT: (C)2010,JPO&INPIT
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