| 摘要 |
In a rolling die for forming a ball screw by rolling for example, a biting portion is formed on one end of a straight portion while a relief portion is formed on the other end. Further, the helical protrusion on the biting portion and the helical protrusion on the relief portion each become continuously and gradually smaller as distancing away from the dancette portion on the straight portion. The dancette portion on the various portions are continuously formed using only one grinding wheel with its grinding lead being changed.
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