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    • 10. 发明专利
    • Improvements in or relating to the manufacture of pressed metal cases, boxes and other hollow ware
    • GB196325A
    • 1923-04-16
    • GB3394821
    • 1921-12-16
    • VICKERS LTDROBERT OLIVER SKEGGS
    • B21D22/26
    • 196,325. Vickers, Ltd., and Skeggs, R. O. Dec. 16, 1921. Hollow-ware; machine details. - In stamping sheet-metal hollow-ware, boxes &c. such as a gear case A, Fig. 14, the metal which tends to crease is directed so as to form strengthening ribs in the side walls which may serve for attachment &c. The blank, which is shaped so as to reduce the amount of trimming necessary on the finished article, is first stamped to produce channels B and then forced into a built-up die G, Fig. 13, corresponding to the longitudinal profile of the case and having detachable arms L, by a punch C, Fig. 8, having detachable wedges E and interchangeable packing-piece D. The rough cupshaped blank is then forced by the punch C, with wedge plates F instead of E attached thereto ; into the die G arranged between side dies H, Fig. 10. a series of which with faces h , h may be employed successively to form the ribs a , Fig. 5, gradually and bend up the sides a'. The die G may have packing pieces g , Fig. 10, of varying thickness and can be moved relative to the sides H to effect the case A. The ribs a mav be folded on the sides a , Fig. 14. Holes a , a for the shafts and for inspection are blanked or bored out and attachment plates a may be welded on.