Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1976-03-29
1977-11-01
Gilden, Leon
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
29159R, 72377, 72 85, B21D 2214
Patent
active
040559769
ABSTRACT:
A method of making a dynamically balanced cup-shaped blank for use in the production of a V-grooved pulley from 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 conical 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 end 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 cylindrical 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 surface extending rearwardly axially therefrom. A first conical surface extends rearwardly outwardly from the curved front surface forming a first metal deformation zone joined immediately integrally with the curved surface. A rearwardly inwardly extending first metal expansion zone forms a first 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 surface. 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 greater than the radius of the first corner.
REFERENCES:
patent: 1671994 (1928-06-01), Nelson
patent: 1728002 (1929-09-01), Nelson
patent: 3187534 (1965-06-01), Kolpakcloglu
patent: 3282078 (1966-11-01), Kaesmeyer
patent: 3823591 (1974-07-01), Schroder
patent: 3991598 (1976-11-01), Kraft
Aspro, Inc.
Gilden Leon
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