钢轨铣磨车作业过程中会产生大量切削热,热量堆积会导致处在作业区的工件温度不断升高,温度过高会严重影响铣磨质量.通过对钢轨铣磨修复过程进行分析,基于线热源法理论分别建立钢轨成形铣削和成形磨削的温度场模型,在此基础上通过温度场迭加推导出钢轨铣磨联合作业温度场模型并仿真得到铣磨联合作业时工件表面的温度变化曲线.同时,通过搭建专用铣-磨试验台开展钢轨铣磨实验,获取工件表面的温度变化曲线,与仿真结果对比分析验证模型的合理性.借助温度场模型预测铣磨过程中的温度分布,分析不同加工参数对工件表面温度的影响.并通过铣磨速度配比和加工用量选择实现对铣磨区域温度控制,从而可以预防铣磨过程中钢轨材料烧伤.

Plenty of heat is generated in rail milling-grinding operation which will cause continuous heat rise around the work-piece area, excessive heat can affect the milling-grinding quality. Based on linear heat source method, the temperature field model of form milling and form grinding was built respectively and the joint milling-grinding temperature model was deduced via the superposition of temperature field. The temperature changing curves on the work-piece surface were attained by MATLAB simulation. The milling-grinding experiments were conducted on the specially-built platform which includes cutting and measuring system to obtain the temperature changing curves, and the results were compared with simulation ones to demonstrate the validity of the model. The model can predict the milling-grinding temperature and the temperature control is realized by milling-grinding speed ratio and selecting processing parameters to prevent the rail material burns.