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1. 发明专利

JPH04200934A CUPPING DIE 失效
公开(公告)号：JPH04200934A
公开(公告)日：1992-07-21
申请号：JP33795990
申请日：1990-11-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUKUDA KOJI , AKIYAMA NORIYUKI , BETSUMIYA ATSUSHI , YADORI YASUNORI
IPC分类号： B21D22/26 , B21D24/00
摘要： PURPOSE:To accurately work a bottom surface and product chamfering part by mounting a shoulder part to work a product chamfering part on a forming punch to work a plate material into the shape of a bottomed cylinder and providing a chamfering part and a clearance part on a forming die. CONSTITUTION:A plate material 2 is held between a stopper 5 and a forming die 3 and the forming punch 1 is lowered and the material 2 is worked into a bottomed cylinder. Then, an ejector 4 is elevated to eject the obtained product from the forming die 3 and to recover it. In this cupping die, a shoulder part 1a working the product chamfering part 6 on the boundary between the bottom surface and the outer peripheral part of the product is provided on this forming punch 1. On one hand, a chamfering part forming the product chamfering part 6 between the forming die 3 and the shoulder part 1a of this forming punch 1 and a clearance part 7 carrying out no chamfering are provided partially on the forming die 3 to form a clearance A communicating with a degreasing hole 8. Consequently, grease and air are prevented from remaining between the material 2 and the forming punch 1 and the bottom surface of the product and the product chamfering part 6 are improved in accuracy.

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