B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/33, 190/47.1
B21D 22/00 (2006.01) B21D 22/20 (2006.01) B21D 22/22 (2006.01) B21D 22/28 (2006.01) B21D 22/30 (2006.01) B21D 51/26 (2006.01) B65D 1/16 (2006.01) B65D 1/26 (2006.01)
Patent
CA 1277259
ABSTRACT OF THE DISCLOSURE New technology for deep drawing can bodies for use in the manufacture of two-piece cans for food and beverage products from precoated flat-rolled sheet metal can stock in which damage to can stock precoated on both surfaces with an organic coating is avoided and draw-forming of the side wall is controlled to decrease metal require- ments. A draw die cavity entrance (47, 74) is selected to provide at least a major portion of its curvilinear surface having a radius of curvature of about five times nominal sheet metal thickness gage, or less, e.g. a maximum radius of curvature of .04 inch is used for the more commonly used can stock materials. During cup redraw, nesting of curvi- linear clamping surfaces (21, 26) of the prior art is eliminated; the compound curvilinear juncture of a work product cup, between its end wall and side wall, is reshaped about a clamping ring compound curvilinear transi- tion zone (72) of smaller surface area than the cup juncture and, the sheet metal is clamped solely between planar clamping surfaces (63, 71) during redraw to a smaller diameter utilizing a male punch (66) with a punch nose (79) having a significantly larger surface area than that of the cavity entrance zone.
504153
Macrae & Co.
Weirton Steel Corporation
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