| 摘要 |
<p>A method of making a male resistance welding electrode includes a forward extrusion step in which the shank portion (12) of the electrode is partially formed by extruding a cut-off billet of dispersion strengthened copper over a pin (24) in a first die (20,). Subsequently, the preform billet (28) produced in the first die (20) is inserted into a second die which defines a tapered shank cavity region around a central pin (42) and a larger cavity region from which the head portion of the electrode is ultimately formed. The shank portion (12) of the electrode is formed and the head portion worked substantially by the application of pressure to the preform billet (28) by a first forming member (50). Final forming occurs when a second forming member applies pressure to the head of the electrode while the electrode remains in the second die. If desired, a small nose portion may be formed on the tip of the electrode by the second forming member and subsequently removed in a machining or cutting operation, eliminating surface irregularities in the electrode head portion surface.</p> |
