| 摘要 |
A method is provided of making a collar (10') having an annular flat outer surface (118) and an inner surface having an inwardly tapering first portion (120) and peripheral outwardly tapering notch portion (122). The method includes the steps of providing a die assembly including a die cavity having an annular seating surface (130) with an opening (132) therethrough and an annular side wall (134) and a reciprocating forming die (136). The die (136) includes a shoulder portion (138) closely fitting against the side wall (134) of the cavity (128) and a cylindrical portion (140) and a frustoconical portion (142) therebetween. The forming die (136) enters the die cavity (128) whereby the cylindrical portion (140) enters the opening (132) of the seating surface (130) so that the cylindrical portion is spaced therefrom. A preformed cylindrical collar (10) is disposed in the die cavity and compressed between the shoulder (138) and seating surface (130) to cold form the first portion (120) of the preformed collar (10) against the frustoconical surface (142) and to cold form the notch portion (122) within the space between the cylindrical portion (140) and the seating surface (130). The collar (10') is mounted on the frustoconical portion (150) of an axle (148) so as to press-fit the inwardly tapering portion (120) of the collar (10) against the frustoconical portion of the axle (148) and securing the collar (10) to the axle (148). The peripheral face (152) of the collar (10') is machined away a predetermined amount into the notch portion (122) as the notch portion (122) provides clearance between the machining tool (156) and the wheel axle (148).
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