基于电主轴热应力耦合分析的误差补偿方法研究

Research on Error-compensation Method Based on the Thermal-stress Coupling of the Electric Spindle Shaft

为了在车床运行时能更精确地进行稳态热补偿,根据机械变形学和传热学的有关理论,综合考虑车床主轴轴线各个零件之间热传递以及其与空气、风扇对流换热对温度场和温度应力场的影响,采用SolidWorks三维建模软件和ANSYS热稳态与热应力耦合分析求解技术,获得了车床在稳态加工时车床主轴轴系的轴端应变值。通过与实验数据的对比,说明了该方法的准确性,从而采用数控误差补偿修正因热变形引起的精度误差。

In order to conduct the thermal compensation under steady-state processing more accurately ,the strain value of spindle shaft＇s end is obtained through three dimensional modeling in the SolidWorks and thermal-stress coupling analysis in the ANSYS. Based on some relevant theories of mechanical deformation theory and heat transfer theory, the analysis considers the effects of radiation heat transfer among spindle shaft＇s parts , heat convection between atmosphere, fans and the shaft . The comparison with the experimental data proves the accuracy of the method. NC compensation is used to correct the precision error caused by thermal deformation.