Method of manufacturing hub unit for supporting wheel and die for manufacturing the same

摘要

When a shape of the cylindrical portion (8b) to be formed into the calking portion (9b) is devised and when a sectional shape of the annular recess portion (23) of the die (15a) for plastically deforming the cylindrical portion (8b) is devised, the calking portion (9b) is continuously given a compressive average stress during the process of working.