METHOD OF MANUFACTURING WHEEL BEARING DEVICE, AND WHEEL BEARING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a wheel bearing device equipped with a flanged shaft member in which durability can be improved without weight increase.SOLUTION: Provided is a method of manufacturing a wheel bearing device 10 equipped with a flanged shaft member 12 having: a shaft portion 11 provided on one end side in an axial direction and to which a rolling bearing 13 is assembled; a fitting shaft portion 24 which is provided on the other end side in the axial direction and fitted into the center hole of a wheel; a forged recess portion 25 which is formed on the other surface in the axial direction on shaft center O of the fitting shaft portion 24; and a plurality of flange portions 27 which extend outward in a radial direction from an outer peripheral surface between the shaft portion 11 and the fitting shaft portion 24 and provided in a circumferential direction with an interval to each other. The method includes: a process of forming the flange portions 27 by a lateral extrusion while forming the forged recess portion 25 by a forging die apparatus for performing cold forging; and a process of partially performing surface removal processing to a specified portion of the inner surface of a forged recess portion 25 where sink could occur by the process.