| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly-efficient and consistent manufacturing method of a high dimensional precision pipe capable of consistently manufacturing the high dimensional precision pipe with high efficiency by reducing the punching load and preventing occurrence of buckling and seizure flaw or the like when manufacturing the high dimensional precision pipe excellent in wall thickness deviation or the like by punching. SOLUTION: A corner 6 of an approach part of a die 2 and a bearing has a round shape. The radius Rd of curvature of the round shape is set to be≥5 mm. A corner 7 of an approach part of a plug 3 and the bearing has also a round shape. The radius Rp of curvature is set to be≥5 mm to perform the punching. COPYRIGHT: (C)2007,JPO&INPIT
|
