Claims
- 1. 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.
- 2. A method for fabricating a roller cage according to claim 1, wherein said contact surfaces and said expansion portions are simultaneously formed by the press-molding of said separation bar.
- 3. A method for fabricating a roller cage according to claim 1, wherein said backing die further includes a pair of slanted surfaces provided between said base portion and said projection portion.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-156205 |
Jun 1998 |
JP |
|
Parent Case Info
This is a divisional of application Ser. No. 09/324,056 filed Jun. 2, 1999 now U.S. Pat. No. 6,186,669 B2, the disclosure of which is incorporated herein by reference.
US Referenced Citations (8)
Foreign Referenced Citations (5)
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DE |
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Jul 1998 |
DE |
5-157116 |
Jun 1993 |
JP |
8-28576 |
Feb 1996 |
JP |