| 发明名称 |
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| 摘要 |
A process for the production of bi-metallic contact rivets with especially thin precious metal layers. The process includes the insertion of two wire segments of congruous diameter but of different length and different composition into a guide bush which fits these; arranging the wire segments between an ejector pin displaceable lengthwise in the guide bush, and an abutment with a cross-sectional surface which is larger than the cross-sectional surfaces of the wire segments, which abutment is arranged coaxially to the ejector pin outside the guide bush and initially abutting the adjacent one end surface of the guide bush; while pushing forward the ejector pin in the guide bush, the abutment is simultaneously withdrawn away from the guide bush, the velocity of the abutment being smaller than that of the ejector pin; thereby upsetting the wire segments in accordance with the decreasing distance between the adjacent surfaces of the ejector pin and of the abutment, and forming a blank of a cylindrical shape; the contact rivet head is formed by cold press-working at that end of the blank where the short wire segment is found, the rest of the blank serving as the rivet shaft. |
| 申请公布号 |
DE3112453(C2) |
申请公布日期 |
1985.08.08 |
| 申请号 |
DE19813112453 |
申请日期 |
1981.03.28 |
| 申请人 |
DODUCO KG DR. EUGEN DUERRWAECHTER, 7530 PFORZHEIM, DE |
发明人 |
BOLLIAN, ERWIN, 7550 RASTATT, DE |
| 分类号 |
H01H11/04;(IPC1-7):B21K1/62 |
主分类号 |
H01H11/04 |
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