| 发明名称 |
VERFAHREN ZUR HERSTELLUNG VON METALLENEN HOHLPROFILEN UND EINRICHTUNG FUER DIE DURCHFUEHRUNG DES VERFAHRENS |
| 摘要 |
In the manufacture of a tubular metal body, metal is extruded in a continuous length of hollow cross-section, the extrudate is divided into shorter lengths, the shorter lengths are heated and at least the internal cross-section of the shorter lengths is enlarged. A mandrel 4 is drawn through the metal body 1.1 which is enclosed in an outer die 3 to expand its internal cross- section. <IMAGE>
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| 申请公布号 |
DE3816090(A1) |
申请公布日期 |
1989.11.23 |
| 申请号 |
DE19883816090 |
申请日期 |
1988.05.11 |
| 申请人 |
HOESCH AG, 4600 DORTMUND, DE |
发明人 |
SCHULTE, WILHELM, DIPL.-ING., 5860 ISERLOHN, DE |
| 分类号 |
B21D39/20;B21K1/30;B23P13/04;B23P15/14 |
主分类号 |
B21D39/20 |
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