Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1986-02-21
1991-05-14
Spruill, Robert L.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72347, 72350, 220 72, 220458, B21D 2220, B21D 5126
Patent
active
050145363
ABSTRACT:
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 requirements. 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 0.04 inch is used for the more commonly used can stock materials. During cup redraw, nesting of curvilinear 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 transition 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.
REFERENCES:
patent: 3272383 (1966-09-01), Harvey
patent: 3509754 (1970-05-01), Massinggill et al.
patent: 3785311 (1974-01-01), Yoshikawa
patent: 3832962 (1974-09-01), Rolles
patent: 3905507 (1975-09-01), Lyu
patent: 3934527 (1976-01-01), Saunders
patent: 4054227 (1977-10-01), Saunders
patent: 4264017 (1981-04-01), Karas et al.
patent: 4404836 (1983-09-01), Saunders
patent: 4405058 (1983-09-01), Phalin
patent: 4412440 (1983-11-01), Phalin et al.
patent: 4425778 (1984-01-01), Franek
patent: 4450977 (1984-05-01), Colburn et al.
patent: 4485663 (1984-12-01), Gold
patent: 4507339 (1985-03-01), Carbo et al.
patent: 4515284 (1985-05-01), Lee et al.
patent: 4522049 (1985-06-01), Clowes
patent: 4584859 (1986-04-01), Saunders
patent: 4646930 (1987-03-01), Karas et al.
Modern Metals, Oct. 1962, "Design for Drawing Aluminum" pp. 68, 70, 71 and 74.
Baker Raymond N.
Spruill Robert L.
Weirton Steel Corporation
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