B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/65
B21D 22/14 (2006.01) B21D 53/26 (2006.01)
Patent
CA 1075089
METHOD AND APPARATUS FOR MAKING DOUBLE GROOVE PULLEYS ABSTRACT OF THE DISCLOSURE An apparatus is provided for forming a pulley having at least two grooves from a cup-shaped metal blank having an axially extending sidewall. The blank is rotated about its longitudinal axis and is crushed between axially closing dies. As the blank is being crushed, an inner forming roll positioned within the cup is translated radially away from the longitudinal axis of the cup and into contact with the inner periphery of the cup. A rough forming roll is translated radially into contact with the outer periphery of the cup and applies forming pressure at a location radially offset from the area of contact of the inner forming roll. A finish forming roll is radially aligned with the rough forming roll and is translated radially toward the outer periphery of the cup. The rough and finish forming rolls are carried by cam-actuated slide assemblies arranged to move the rough roll into the blank wall in advance of the finish roll in a working operation so as to partially form a pulley groove and to maintain the finish roll in the partially formed groove in an idling operation. Thereafter, the rough roll is disengaged from the partially formed pulley groove and the finish roll is advanced to the root of the partially formed groove and into a working operation to form the finish groove against the inner roll.
285400
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