| 摘要 |
1,141,578. Making commutators; extruding; welding by fusion. FORD MOTOR CO. Ltd. 22 Nov., 1967 [12 Dec., 1966], No. 53074/67. Headings B3A, B3P and B3R. A commutator is made from a length of copper bar 10 by bending the bar into a ring 14, electron beam welding the adjacent edges 11, 12 together and extruding the ring blank 15 in an extrusion press to form an elongated member 17 which is thereafter formed into a commutator by machining. The bar is bent into a W-cross-section before being formed into a ring and the edges 11, 12 are tapered to provide parallel faces for welding. The welding is pe:- formed on a group of rings mounted on a bar 23, Fig. 2, and advanced past an electron beam welding device 21. The device is housed in a vacuum chamber 20 at 10 to 100 microns pressure. The blank is then annealed at 900‹ F. for 20 to 30 minutes and rinsed in dilute acid to etch it after which it is washed in soap solution which adheres to the blank surface to act as a lubricant for the extruding. The extrusion press comprises a die (33), Fig. 3 (not shown), on which the blank (15) is seated and a mandrel (36) and ram (35) which co-operate to force the blank into the die. |
