F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/244
F16H 55/44 (2006.01) F16H 55/49 (2006.01)
Patent
CA 1065169
ABSTRACT OF THE DISCLOSURE A dynamically balanced V-grooved sheet metal pulley made from a flat sheet metal disc by roller spinning and splitting tools. The disc is provided with a central hole for mounting the disc on rotating die means between first headstock and tailstock die form assemblies of a spinning machine. The spinning tool presses the disc against an end of a headstock die form and moves generally radially outwardly pressing a portion of the die against the end of the die to provide a circular hub wall. The spinning tool then moves in a series of passes along the headstock die form thereby rolling, forming and ironing the rotating outer metal por- tions of the disc against the die and forming an axially extending cylindrical side wall terminating in a radially outwardly extend- ing annular flange of a cup-shaped stage blank. The flange is then trimmed to a predetermined length and to form a peripheral axially extending edge on the flange. The cup-shaped blank then is transferred to and clamped between second headstock and tail- stock die form assemblies. The clamped cup-shaped blank is rotated and splitting roll means splits the peripheral edge of the annular flange by exerting radial pressure thereon to form a rough Y-shaped groove in the flange. Finishing roll means the move radially into the rough V-shaped groove and forms a finished V-shaped pulley groove. Alternately, the spinning tool may thin the metal in the cylindrical side wall during the forming of the cup-shaped stage blank, whereby the finished pulley has a thicker reinforced circular end wall for receiving a hub than the thinned cylindrical side wall.
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