| 摘要 |
PROBLEM TO BE SOLVED: To provide a roller bearing cage manufacturing method using high-yield rolling molding for improving producing efficiency and adaptability for handling a number of models and suppressing the dispersion of the diameter size of a collar portion. SOLUTION: The manufacturing method is provided for a roller bearing cage which has collar portions formed at both ends of a cylindrical portion extending to the side of the inner diameter. Herein, the cage is rolling-molded while holding a cylindrical raw material 1A inside and outside between a mandrel having an inner peripheral face forming portion 11a corresponding to the inner peripheral face of the cylindrical portion, a collar portion inside face forming portion 11b corresponding to the inside face of the collar portion and a collar portion pressing portion 11c corresponding to the end face of the collar portion, and a molding roll 12 having an outer peripheral face forming portion 12a corresponding to the outer peripheral face of the cylindrical portion and a collar portion outside face forming portion 12b corresponding to the outside face of the collar portion. COPYRIGHT: (C)2008,JPO&INPIT
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