1.Ningbo STF Hydraulic Transmissions Company;2.School of Mechanical Engineering,YanShan University,Hebei Qinhuangdao
Supported by the National Key R&D Program of China（No.2021YFB3400503），Science and Technology Project of Hebei Education Department（BJK2023043）
常规的整体感应器中频淬火法,会导致曲线导轨内表面硬化层硬度、深度不均匀,低速大扭矩内曲线液压马达在重载工况下极易造成马达曲线导轨失效。因此提出了一种曲线导轨表面热处理中频淬火工艺优化方法,在常规方法的基础上,应用曲线磨床仿形的加工原理,即采用数控(Computer numerical control,CNC)仿形淬火的来进行热处理。并分别对常规淬火以及优化后的数控仿形淬火处理后曲线导轨性能参数进行测试。通过分析对比可知：优化后的数控仿形淬火所得曲线导轨曲面硬度相比常规淬火方法更高、曲线导轨硬化层深度均匀性更好,在硬度方面提高了3～5 HRC；在硬化层深度方面,提高了1.5～3.5 mm。该优化方法可为重载工况内曲线液压马达曲线导轨的应用提供指导。
The conventional inductor medium frequency quenching method will lead to uneven hardness and depth of the inner surface hardening layer of the curved guide rail, and it is easy to cause the failure of the motor curve guide rail under the heavy-duty condition of low-speed and high-torque internal curve hydraulic motor. An optimization method for medium-frequency quenching process of curved rail surface heat treatment is proposed. On the basis of conventional methods, the processing principle of curve grinding machine profiling is applied, that is, computer numerical control (CNC) profiling is used for heat treatment. And the performance parameters of curved guide rail after conventional quenching and optimized CNC profiling quenching treatment are tested respectively. Through analysis and comparison, it can be seen that the surface hardness of the curved guide rail obtained by the optimized CNC profiling quenching is higher than that of the conventional quenching method, and the depth uniformity of the curved guide rail hardening layer is better. In terms of hardness, it is increased by 3~5 HRC; In terms of hardening layer depth, it is increased by 1.5~3.5 mm This optimization method can guide the application of curved hydraulic motor curved guides in heavy duty conditions.