| 摘要 |
PURPOSE: A method for manufacturing complex-type bushing is provided to improve the endurance, impact resistance and load resistance even when used for a long time by strongly bonding inner and outer parts thereof. CONSTITUTION: A cylindrical steel pipe is fabricated by cutting pipe material in a required size. The cylindrical steel pipe is washed, and a sintered bushing fabricated through a powder metallurgy process is press-fitted into the cylindrical steel pipe. Then, the cylindrical steel pipe coupled with the sintered bushing is heated, so that the cylindrical steel pipe and the sintered bushing are bonded. After that, a bonding part of the bonded bushing is inspected for checking the fault and a heat treatment process is carried out. The bonded bushing, which has been passed through the heat treatment process, is subject to a vacuum inclusion process so that oil is coated on the sintered bushing.
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