Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1993-02-05
1993-11-23
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72350, 72467, B21D 2220
Patent
active
052633543
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 .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 endwall 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: 3494169 (1970-02-01), Saunders
patent: 4036056 (1977-07-01), Saunders
patent: 4414836 (1983-11-01), Saunders
patent: 4485663 (1984-12-01), Gold et al.
patent: 4584859 (1986-04-01), Saunders
patent: 4685322 (1987-08-01), Clowes
Baker Raymond N.
Gurley Donald M.
Larson Lowell A.
LandOfFree
Drawn can body methods, apparatus and products does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drawn can body methods, apparatus and products, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drawn can body methods, apparatus and products will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1839921