滚动直线导轨温度场建模与分析

Establishment and Analysis of Temperature Field Model of Linear Rolling Guide

滚动直线导轨作为数控机床进给系统重要的功能部件,其热特性对数控机床的性能有重要影响。提出了一种导轨截面瞬态温度场理论模型建立、求解的方法,实现了对滚动直线导轨热特性的分析。首先,确定了滚动直线导轨的导热模型,基于有限差分法建立了导轨截面各节点离散方程组,建立了导轨截面瞬态热特性理论模型,求解获得了导轨截面瞬态温度场;其次,建立了导轨热特性仿真分析模型,获得导轨的稳态温度场;最后,进行了热特性实验,验证了所建立的理论和仿真分析模型。结果表明:稳态温度场理论模型和实验结果最大误差为7.25%,且瞬态温度场的变化趋势与实验结果一致,验证了温度场理论分析模型的正确性。有限元分析结果与实验测量的结果最大误差为6.22%,验证了热特性仿真分析的可靠性。

The linear rolling guide is an important functional component of the CNC machine tool feed system, its thermal characteristics have an important influence on the performance of CNC machine tools.A method for establishing and solving the theoretical model of the transient temperature field of the rail section was proposed in this paper, the analysis of the thermal characteristics of the rolling linear guide was realized.Firstly, the heat conduction model of the guide was established, the theoretical model of the transient thermal characteristics of the guide section is established, the transient temperature field of the rail section was obtained by solving.Secondly, the thermal characteristic analysis model of the guide was established, the steady-state temperature field of the guide was obtained.Finally the thermal characterization experiments were carried out, the established model was validated.The results show that the maximum error between theoretical model and experimental results of the steady-state temperature field is 7.25%,and the change trend of the transient temperature field is consistent with the experimental results, the correctness of the theoretical analysis model of the temperature field was verified.The maximum error between the finite element analysis and the experimental data is 6.22%,the reliability of thermal characteristic simulation analysis was verified.