发明名称 |
Method for hydrostatic extrusion of tubes |
摘要 |
In the hydrostatic extrusion of tubes in a press which has a pressure chamber containing a high pressure cylinder, a pressure generating portion insertable into the cylinder, a die arranged in the cylinder and a mandrel axially fixed in relation to the die and composed of a carrier portion and a tip, and in which the tip forms with the opening in the die a gap in which a tubular billet is shaped into a tube by hydrostatic extrusion, in connection with the insertion of the tubular billet, a seal is produced initially between the mandrel and the hole in the billet at a point between the front part of the mandrel carrier and the hollow wall of the billet. This may be done by producing a constriction of the front end of the hole in the billet before the mandrel is inserted therein or by upsetting the billet against the die.
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申请公布号 |
US4031732(A) |
申请公布日期 |
1977.06.28 |
申请号 |
US19750580463 |
申请日期 |
1975.05.22 |
申请人 |
ASEA |
发明人 |
LARKER, HANS;LUNDBLAD, ERIK;LUNDBACK, BERTIL;NILSSON, JAN |
分类号 |
B21C23/08;B21C23/00;(IPC1-7):B21C25/04 |
主分类号 |
B21C23/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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