| 摘要 |
PROBLEM TO BE SOLVED: To provide a tubular worm formed with smooth tooth tip of a gear without generating bending by rolling a hollow raw material, which is formed hollow inside thereof, for formation. SOLUTION: Fig.(a) is a cross section of the hollow raw material S, Fig.(b) is formed by narrowing the hollow raw material S, Fig.(c) is formed by rolling after narrowing in multiple stages, and Fig.(d) is formed by pressing an inside diameter spline to the rolled tubular worm. A mark 6 shows the inside diameter spline. Fig.(e) shows final process of grinding outside diameter and machining screw. A mark 7 shows a screw machining part, and a mark 8 shows an outside diameter grinding part. Since the hollow raw material formed hollow inside thereof is rolled for formation, breakdown of tooth tip and bending (tooth tip looks like being broken) are prevented, and tooth shape error and tooth line error are restricted small, and accurate formation is possible. COPYRIGHT: (C)2006,JPO&NCIPI
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