Patent ID: 6065322
Filing Date: 2000-05-23
Classification: B21K,F16C,Y10T

Abstract:
A method of forming blanks for bearing rings, comprising:cutting a cylindrical article including an outer cylindrical portion and an inner cylindrical portion, the inner cylindrical portion having a bottom and having an end integrally joined to the outer cylindrical portion at a boundary line, wherein said cutting is along the boundary line so as to separate the outer cylindrical portion from the inner cylindrical portion such that the outer cylindrical portion has an inner diameter substantially equal to an outer diameter of the inner cylindrical portion and whereby no waste is produced;punching the bottom of the inner cylindrical portion so as to remove the bottom and form the inner cylindrical portion into a blank for an inner bearing, wherein said punching of the bottom is performed simultaneously with said cutting of the cylindrical article; andforming the outer cylindrical portion into a blank for an outer bearing ring by diametrically expanding the outer cylindrical portion;wherein said cutting, said punching, and said forming are continuously performed in a hot state.