| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a shaft member of a wheel rolling bearing device, which can efficiently manufacture the shaft member of the wheel rolling bearing device with a simpler die by appropriately securing a desired dimensional accuracy and surface roughness.SOLUTION: In a method for manufacturing a shaft member of a wheel rolling bearing device, a cylindrical fitting shaft part having a recess opening in an axial direction, a flange part having a disk shape or a radial shape orthogonal to the axial direction, and a shaft part having a columnar shape in which an inner ring raceway surface is formed on an outer peripheral surface thereof are coaxially arranged along the axial direction. The method includes: a heating step (B) of heating steel to a hot rolling temperature of a transformation point temperature or above; hot-forging steps (C)-(E) of molding the steel of the hot rolling temperature into a forging intermediate molded product 7E; and a cold forging step (J) of molding the forging intermediate molded product into a forging final molded product 7J by cold forging. |
