| 摘要 |
A component for a roller clutch assembly includes a sleeve having a head part and a shank part, and the component is produced by first cropping a steel bar to produce a slug having a length to diameter ratio of not less than 0.75. The slug is then deformed into a substantially cylindrical billet having a diameter substantially equal to the diameter of the head part of the finished component. After heat treatment of the billet to remove work hardening, an axially extending, centrally disposed bore is formed in the billet and the billet is positioned in a die. Within the die, a punch is used to perform a first impact extrusion process on the billet so that metal flows in the direction of movement of the punch and produces a preform defining the shank part of the sleeve and having a head portion which tapers inwardly to towards said shank part. The preform is then heat treated to remove work hardening and a further punch is then used to perform a second impact extrusion process on the preform. In the second extrusion process, metal flows in the opposite direction to the direction of movement of the further punch and effects shaping of the preform so that the included angle of the tapering head portion of the preform is increased to produce the head part of the sleeve and thereby, the finished component.
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