B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
26/156, 153/16
B21D 39/20 (2006.01) B21D 41/02 (2006.01)
Patent
CA 1312458
ABSTRACT Forming a flanged end on a tubular workpiece, using a die having a throat with an abutment surface extending transverse- ly on each side of the throat. The workpiece is positioned to extend through the throat with one end of the workpiece extending adjacent the abutment surface. A transversely expandable mandrel is inserted in collapsed condition in the end of the workpiece. The mandrel has a pair of laterally separable cheek pieces each movable to a position overlying a respective abutment surface, and a wedge member reacting between the cheek pieces to separate them laterally. The wedge member is extended to separate the cheek pieces and expand the side wall of the workpiece transversely outwardly to overlie the abutment surfaces. The cheek pieces are then driven together in the expanded condition longitudinally inwardly to coin a portion of each expanded side wall between an end face of each cheek piece and a respective abutment surface, and thereby provide a flanged portion on each side of the work- piece.
571880
Ridout & Maybee Llp
Vari-Form Inc.
LandOfFree
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