Patent ID: 6016602
Filing Date: 2000-01-25
Classification: B21D,B21H,Y10T

Abstract:
A method of producing a sheet metal gear from a metal sheet having a planar surface, and with a shaping roller having a valley-shaping face and a peak-shaping face, the method comprising the steps of:preparing the metal sheet by punching out a number of places on an outer peripheral edge of the metal sheet in a direction perpendicular to the planar surface of the metal sheet, the places being arranged with a regular pitch, thereby forming preliminary valleys for the sheet metal gear and preliminary peaks respectively existing between adjacent ones of the preliminary valleys;fitting the valley-shaping face of the shaping roller into the preliminary valleys and the peak-shaping face onto the preliminary peaks;rotating the shaping roller while following the metal sheet and pressing the shaping roller against the metal sheet, thereby increasing the depth of the preliminary valleys of the metal sheet to form shaped valleys of the metal sheet gear, and increasing the height of the preliminary peaks to form shaped peaks of the metal sheet gear;using a metal sheet which is smaller in thickness than the peaks of the sheet metal gear to be shaped; andthickening the outer peripheral edge of the metal sheet precedent to said preparing.