초록 ▼

An improvement in a method of manufacturing poly-V pulleys made of sheet metal, which is performed by subjecting a preformed cupshaped blank to working by a corrugating roller, an auxiliary forming roller and a finish forming roller. Prior to corrugation of the blank by the corrugating roller, a con

An improvement in a method of manufacturing poly-V pulleys made of sheet metal, which is performed by subjecting a preformed cupshaped blank to working by a corrugating roller, an auxiliary forming roller and a finish forming roller. Prior to corrugation of the blank by the corrugating roller, a connecting portion between the peripheral wall and the bottom wall of the blank is pressed in a manner that the inside surface of the peripheral wall and the inside surface of the bottom wall are pressed into contact with each other, thereby to preform a lug which provides a side wall for grooves adjacent to the connecting portion.

대표청구항 ▼

A method of manufacturing sheet metal poly-v pulleys, comprising the steps of: forming a cup-shaped blank having a peripheral wall and an end wall joined at a connecting portion; pre-forming a lug between the end wall and the peripheral wall by pressing the end wall and peripheral wall toward one a

A method of manufacturing sheet metal poly-v pulleys, comprising the steps of: forming a cup-shaped blank having a peripheral wall and an end wall joined at a connecting portion; pre-forming a lug between the end wall and the peripheral wall by pressing the end wall and peripheral wall toward one another around the connecting portion between the end wall and the peripheral wall such that inside surfaces of the end wall and the peripheral wall are pressed into contact, said lug forming at least a part of an uppermost V-groove; after said preforming step, pressing a corrugating roller against the peripheral wall from outside the blank to bring the wall into a corrugated shape having ridges alternating with grooves on an outer surface of said peripheral wall, the corrugating roller also pressing against said uppermost V-groove; axially compressing the peripheral wall while keeping the corrugating roller inserted in the respective grooves, thereby forming poly-v grooves of predetermined spacing; and, finishing the grooves by pressing a finish forming roller in the grooves.