B - Operations – Transporting – 21 – H
Patent
B - Operations, Transporting
21
H
113/64
B21H 1/00 (2006.01) B21D 22/16 (2006.01) B21D 53/26 (2006.01)
Patent
CA 1053989
ABSTRACT OF THE DISCLOSURE A method of making a dynamically balanced cup-shaped blank for use in the production of a V-grooved pulley form a flat sheet metal disc by flow forming the metal with an improved metal spinning roller construction. The disc is mounted on rotating die means between headstock and tailstock die forming assemblies of a spinning machine. A first spinning roller pressure shear forms and thins an intermediate annular portion of the disc along a con- ical surface of the headstock die to form a conical wall of the cup-shaped blank, with an unworked outer annular portion of the disc extending outwardly of the conical wall. A plurality of the improved rollers are moved axially along and parallel with the headstock die means in a single pass. Outer curved front said surfaces of the rollers lay the outer unworked annular portion of the disc along a cylindrical surface of the headstock die form without materially reducing the metal thickness to rough form a cylindrical wall of the cup-shaped blank. This cylindrical cup wall then is immediately thinned and elongated along the cylindri- cal surface of the headstock die by a first metal deformation zone formed on each of the rollers. The depressed metal is permitted to expand slightly into a relief zone formed on each of the rollers immediately rearwardly of the first metal deformation zone. This expanded metal is immediately thinned further by a second metal deformation zone formed on each of the rollers. The metal then is immediately burnished and again expanded slightly outwardly to facilitate its removal from the headstock die by a second metal relief zone or burnishing surface formed on the rear of the rollers. The improved roller has a front face and a curved sur- face extending rearwardly axially therefrom. A first conical sur- face extends rearwardly outwardly from the curved front surface forming a first metal deformation zone joined immediately inte- grally with the curved surface. A rearwardly inwardly extending first metal expansion zone forms a fist corner at the junction with the first metal deformation zone, with the corner having a radius greater than any radius of a point of the curved front sur- face. A second conical surface extends rearwardly outwardly from the first expansion zone forming a second metal deformation zone. A rearwardly inwardly extending second metal expansion zone forms a second corner with the second conical surface, with the second corner having a radius measured from the axis of the roller great- er than the radius of the fist corner.
265611
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