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    Heat treatment process for bushing used in track of endless track tractor
    1.
    发明公开
    Heat treatment process for bushing used in track of endless track tractor 失效
    Verfahren zurWärmebehandlungvon BuchsenfürGleisketten von Raupenkettentraktoren。

    公开(公告)号：EP0339152A1

    公开(公告)日：1989-11-02

    申请号：EP88303890.3

    申请日：1988-04-28

    申请人： TOPY INDUSTRIES, LIMITED

    发明人： Sahara, Takahiko, c/o Topy Industries Ltd. ,  Kusano, Hisahiko, c/o Topy Industries Ltd. ,  Kaneko, Masayoshi, c/o Topy Industries Ltd. ,  Nakajima, Masahiro, c/o Topy Industries Ltd. ,  Sato, Toshihiko, c/o Topy Industries Ltd.

    IPC分类号： C21D9/14 ,  C21D1/42 ,  B62D55/205

    CPC分类号： C21D1/42 ,  B62D55/205 ,  C21D9/14 ,  Y02P10/253

    摘要： This heat treatment process is applicable to bushings used in tracks of endless track tractor and does not deteriorate wear resistance, fatigue strength, and toughness of bushings. As this method can reduce the number of heat treatment process steps and save energy, it enhance productivity and reduces cost of bushing manufacture. These advantages are achieved by the treatment steps of heating a bushing made of middle carbon low alloy steel material from the outer peripheral surface thereof until the inner circumferential surface thereof achieves the temperature range of Ac₃ ≦ T ≦ Ac₃ + 50 (T [°C] : temperature of heated inner circumferential surface, Ac₃ [°C] : transformation temperature) by means of induction heating, cooling the same from the outer peripheral surface, resulting in hardening the same along the entire thickness thereof, and then tempering.

    摘要翻译： 该热处理工艺适用于环形履带式拖拉机轨道中使用的衬套，并且不会降低衬套的耐磨性，疲劳强度和韧性。 由于该方法可以减少热处理步骤的数量并节省能量，所以可以提高生产效率并降低套管制造成本。 这些优点通过从其外周面加热由中碳低合金钢材料制成的衬套到其内周面达到Ac 3的温度范围Ac 3 + 50（T [℃]：加热的内周面的温度，Ac3 [℃]：转变温度），通过感应加热，从外周面冷却，使其沿整个厚度硬化，然后回火 。