Patent ID: 6115920
Filing Date: 2000-09-12
Classification: B21D,B21H,Y10T

Abstract:
A method of manufacturing a multi-grooved V pulley comprising:a preliminary forming step comprising the substeps of: rotating an annular material, and pressing a preliminary form roller against an outer peripheral surface of said material, whereby a corrugation having linear root portions and ridge portions each rising in a smooth curve between each corresponding adjoining two of the root portions is formed in a bottom surface of a wide annular groove of said annular material; anda finish form rolling step comprising the substeps of: rotating the preliminary form produced in said preliminary forming step, and pressing a finish form roller having a plurality of annular V-shaped protrusions arranged at intervals the same as a wavelength of said corrugation against the bottom surface of said preliminary form having said wide annular groove formed with said corrugation, whereby forward ends of the V-shaped protrusions of said finish form roller are brought into contact with the linear root portions of the corrugation formed in the preliminary form to roll form a multi-grooved pulley.