| 摘要 |
A punching method providing extension effect aims to form an oil seal sleeve. Through a mold with a gap formed therein a punching material can be compressed and extended during forming. By reducing the moving speed of the mold the forming speed also is slower. As a result, the roundness improves and surface roughness is reduced after the oil seal sleeve is formed. Thus there is no need to do follow-on lathing and polishing, and the formed oil seal sleeve can meet users' requirements. The invention can increase production speed and reduce production cost and material loss.
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