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装在汽车后桥内的差速器十字轴,即行星齿轮轴,要求有良好的综合机械性能,尤其要求有较高的硬度和耐磨性。通常此零件选用20MaVB、18CRMnTi钢制造,在粗加工后进行渗碳淬火处理。我厂选用40Cr钢,模锻后进行调质处理(HRC30～34),再进行感应加热表面淬火和自回火处理。我们在感应器的设计上作了各种试验和改进,同时采用了简易工装夹具,使表面淬火时减少了消耗,缩短了时间,提高了经济效益,达到了技术要求。
Differential cross shaft installed in the rear axle of the car, namely the planetary gear shaft, requires a good overall mechanical properties, in particular, requires a higher hardness and wear resistance. This part is usually made of 20MaVB, 18CRMnTi steel, carburizing and quenching after roughing. I choose 40Cr steel plant, forging after quenching (HRC30 ~ 34), and then induction heating surface hardening and self-tempering. We made a variety of experiments and improvements in the design of the sensor, using a simple fixture, the surface quenching to reduce consumption, shorten the time and improve economic efficiency and meet the technical requirements.