| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for controlling the length of an incomplete threaded portion formed in a rolling starting portion not longer than a permissible value only by the through-feed rolling. SOLUTION: A rolling method of performing through-feed rolling of a ball screw on a columnar stock 18 between roll dies 10, is characterized in that a columnar part 14 and truncated conical parts 12 and 16 continuous to both ends of the columnar part 14 with the diameter thereof reducing outwardly are provided on the roll dies 10. The distance between the roll dies 10 is reduced in a positional relationship in which a columnar part 2 for form rolling the ball screw of the columnar stock 18 for form rolling of the ball screw overlaps the columnar part 14 of the roll dies in a range of 10 to 65% of the length in the axial direction of the columnar part 14 of the roll die. COPYRIGHT: (C)2004,JPO
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