| 摘要 |
1,240,805. Making annular laminations; stamping. GENERAL MOTORS CORP. 19 March, 1970 [28 March, 1969], No. 13326/70. Headings B3A and B3Q. A method of making an annular lamination for the magnetic core, Fig. 6, of a dynamoelectric machine comprises bulging a length of tubular ferromagnetic material 10, pressing it in an annular die assembly 28, Fig. 3, to form a flat annular disc then cutting slots 38 in the disc for the electrical conductor windings. The pressing operation may simply fold the bulged length or press it flat. In the former case the folded discs are stacked, riveted together and then pressed in an annular die, Fig. 7 (not shown). The bulging operation may be performed in a compressible rubber die (26) which presses the workpiece 10 against shaped outer dies (14), (16), Fig. 2 (not shown), or may be performed in a die assembly as shown in Fig. 8. In this assembly radially operating dies 90, slidable in slots formed in a part 94 and biased radially inwardly by springs 96, are moved by an axially movable part 88 to deform the tubular material into a space 93. After the deformation and removal of part 88 and opening of the die along parting line 78 the bulged part is ejected by part 74 operated by springs 76. The assembly is shown set up for vertical operation of part 88 but may be turned on its side when gravity feed of workpieces is used. |
