| 发明名称 |
Piercing a solid billet |
| 摘要 |
An initial well is formed into the rear end of a cylindrical billet thereby providing a centering collar. The billet is additionally centered at the receiver bottom and pierced by a frustoconical mandrel under retention of the well.
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| 申请公布号 |
US4129022(A) |
申请公布日期 |
1978.12.12 |
| 申请号 |
US19770819494 |
申请日期 |
1977.07.27 |
| 申请人 |
MANNESMANN AKTIENGESELLSCHAFT |
发明人 |
THONNES, HORST;WUNSCHE, JOACHIM |
| 分类号 |
B21C23/32;B21J5/10;B21J9/04;(IPC1-7):B21C23/32;B21D37/18 |
主分类号 |
B21C23/32 |
| 代理机构 |
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代理人 |
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| 主权项 |
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