Method and apparatus for drawing heavy wall shells

Details Method and apparatus for drawing heavy wall shells Method and apparatus for drawing heavy wall shells

B - Operations, Transporting

21

D

113/72

B21D 22/20 (2006.01) B21D 22/21 (2006.01) B21D 22/28 (2006.01)

Patent

CA 1220986

24 METHOD AND APPARATUS FOR DRAWING HEAVY WALL SHELLS ABSTRACT A forming machine (10) is provided for forming a finished part (12) from a flat blank (14). Draw stations (18-24) are provided to initially form the intermediate part. Each draw station includes a punch (44, 62, 66, 70) and 2 draw die (48, 64, 68, 72). Each punch defines a shoulder along its length to create a step (60) in the side walls (26) of the intermediate part. In the subsequent necking and final form stages (30, 32, 34) the punch employed also has a shoulder to permit variation of the force applied to the intermediate part between the step and bottom portion.

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