Patent ID: 6425182
Filing Date: 2002-07-30
Classification: F16C,Y10T

Abstract:
A method of fabricating a roller cage for a roller bearing, said roller cage having separation bars separately defining a plurality of window holes along a peripheral direction of the bearing with a constant interval thereamong, each of said separation bars being formed in a substantially rectangular shape having an outer diameter surface and an inner diameter surface and a pair of side surfaces, said method comprising the steps of:preparing a backing die and a pressing die, said backing die having a base portion and a projection portion, said projection portion having a supporting surface contactable with one of said outer diameter surface and said inner diameter surface, a width of said supporting surface being less than that of said one of said outer diameter surface and said inner diameter surface, said pressing die having a pair of slanted surfaces slanted so as to spread toward a pressing direction of said pressing die; disposing said separation bar on said backing die; and shifting said pressing die toward said backing die so as to press-mold said separation bars, whereby said separation bars are formed with a pair of contact surfaces deformed by said slanted surface of said pressing die and a pair of expansion portions expanding from said one of said outer diameter surface and said inner diameter surface toward a radial direction.