Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1993-11-22
1997-01-07
Rachuba, M.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72349, 72350, 72346, B21D 2220, B21D 5126
Patent
active
055905587
ABSTRACT:
Draw processing flat-rolled sheet metal substrate preselectively precoated on each surface with organic coating and draw lubricant into one-piece can bodies ready for assembly into sanitary can packs free of any requirement for applying organic coating or adding organic coating for repair purposes after fabrication and before such direct usage. Cupping of precoated flat-rolled sheet metal can stock using preselected tooling configurations and clearance avoids any increase in side wall metal thickness gage. Tension elongation during redraw is controlled over side wall height by clamping solely between planar clamping surfaces, tooling configurations and preselected clearances to decrease thickness gage uniformly over side wall height between flange metal open end of can body and curved transition zone at closed end. Surface area of the cavity entrance zone for each die is fabricated about multiple radii forming sharp edge about which coated can stock is drawn into each die cavity. Curved surface transition zone for each punch is maintained large in relation to sheet metal substrate starting gage which facilitates change of configuration of metal from planar state into cylindrical side wall.
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Dalrymple William H.
Saunders, deceased William T.
Gurley Donald M.
Rachuba M.
Weirton Steel Corporation
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