B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
205/23
B21C 23/32 (2006.01) B21D 22/20 (2006.01)
Patent
CA 1164410
METHOD FOR DEEP DRAWING SHEET METAL ABSTRACT OF THE DISCLOSURE An improved method of lubrication in a deep draw- ing process utilizes a plurality of distinct plastic sheets, loosely overlying one another, laid across at least one major surface of a flat blank to be drawn. In preferred practice, a pair of such distinct plastic sheets are laid across each of the opposed major surfaces of a flat blank in preparation for a drawing operation. The plastic sheets are maintained in position while interfitting drawing tools, namely a punch and a die, close together to effect drawing of the blank. The plastic sheets serve as a lubricant during the drawing process. Selected surfaces of the sheets or the material from which the sheets are formed may be provided with an additional conventional lubricating substance to enhance lubricity of the sheets, or conventional lubricant may be utilized between the sheets of each pair.
384988
Gowling Lafleur Henderson Llp
Kessler Products Co. Inc.
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