Method and apparatus for drawing heavy wall shells with a...

Details Method and apparatus for drawing heavy wall shells with a... Method and apparatus for drawing heavy wall shells with a...

B - Operations, Transporting

21

C

205/42

B21C 3/02 (2006.01) B21D 22/21 (2006.01) B21D 51/54 (2006.01)

Patent

CA 1220166

METHOD AND APPARATUS FOR DRAWING HEAVY WALL SHELLS WITH A MULTI-STEP INSIDE EDGE ABSTRACT OF THE INVENTION 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 a draw die (48, 64, 68, 72). Each punch defines a shoulder along its length to create a first step (60) in the side walls (26) of the intermediate part. In a subsequent draw stage, a draw punch (70') forms a second shoulder along its length to create a second step (100) in the side walls (26) of the intermediate part. A draw shoulder (61) on the draw punch (71') mates with the step (60) to maintain the concentric shape thereof. 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.

457833

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