B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
153/16
B21D 19/00 (2006.01) B21C 23/14 (2006.01) B21C 37/16 (2006.01) B21D 39/08 (2006.01) B21D 41/00 (2006.01) B21K 1/10 (2006.01)
Patent
CA 1150611
Abstract A tube with a thick walled portion at one end is cold-formed by necking one end of a tube workpiece, inserting a mandrel which engages within the tapering neck of the necked portion, drawing the necked workpiece through a drawing die by applying pressure on the mandrel, and withdrawing the mandrel from the workpiece. A thick-walled portion may be formed at the opposite end by interrupting the drawing operation, inserting a second mandrel of smaller diameter with a shoulder engaging in the tapering neck of the workpiece, continuing the drawing to draw the remainder of the workpiece down onto the second mandrel, and withdrawing the second mandrel.
361909
Ridout & Maybee Llp
Standard Tube Canada Limited
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