Method of making poly-V pulleys

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work

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29159R, B21H 100

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active

044558538

ABSTRACT:
Improvements in a method of making a poly-V pulley from a metal plate which has V-shaped poly-V grooves formed in a cylindrical flange wall of a cup-shaped blank, by the application of pressing, compression and finishing processes to the blank. More particularly, the improvements reside in the compression process in which the opening end of the flange wall of a cup-shaped blank is fittingly held by a fitting groove which is formed in an upper peripheral edge of a lower rotary pressing form, the groove having a slope with a predetermined upward inclination in the radially inward direction toward the center of the form. Auxiliary rollers are pressed into groove valleys of the corrugated wall of the blank, and the blank is then axially compressed while rotating the blank, thereby converting the corrugated wall into a grooved wall having therein a series of V-shaped crests and valleys.

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