B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/69, 113/70
B21D 22/20 (2006.01) B21D 24/00 (2006.01) B21D 37/00 (2006.01)
Patent
CA 1080043
Abstract of the Disclosure A method and apparatus for multi-step moulding of elongated cups, having a variable depth of the cup bottom and/or a variable cross-section of the cup along its longitudinal extension. The thin metal strip is advanced step-wise through a plurality of male and female die pairs adapted to act in sequence. In a pre-moulding step an oversize cup blank is formed by means of pre-moulding dies and the material is moulded by the finishing moulding steps to form the final smaller cup by means of pleating. As a first step an undulation is formed extending transverse to the direction of feed, the height of the undulation corresponding to the greatest depth of the cup bottom in its final form. The undulation is pre-moulded into a material consuming blank which, when viewed in plan view, extends beyond the outline of the cup in final form. In that thereupon in at least one subsequent moulding step the material of the blank is moulded by the finishing male dies to the final form of the cup. In the pre-moulding step slots for traction relief are cut into the strip transverse to the direction of tension of the material in the area of cross- sectional constrictions outside the outline of the cups.
293093
Kaupert Gunther
Kaupert Gunther
LandOfFree
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