| 摘要 |
Conventional methods for heat treating cylindrical components such as track bushings involve multiple steps. For example, many such methods consist of carburizing, cooling, induction-hardening, quenching, and tempering. The conventional methods have proved to be costly because different heat treating apparatus are required. This causes duplicate handling and wasted manufacturing time. The present invention provides an apparatus 30 for heat treating a bushing 10 simultaneously from an outer peripheral surface 12 and the pair of inner circumferential surfaces 20.
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