高速电主轴热-结构耦合及选材分析

Analysis on Thermal Structure Coupling and Material Selection of High Speed Motorized Spindle

高速电主轴热变形问题一直是影响加工精度的重要因素。为降低电主轴的温升和轴向热伸长量,对某电主轴的热源及热边界条件进行分析,利用ANSYS Workbench软件进行热-结构耦合仿真,得到电主轴温度场和热结构耦合场;搭建实验台测试电主轴系统的温度场和轴向热伸长,验证有限元模型建立的正确性。最后选用38CrMoAl、ZrO_(2)、Si_(3)N_(4)、玻璃陶瓷作为主轴材料进行热-结构耦合对比分析。结果表明:陶瓷材料在热态性能方面优于钢材,玻璃陶瓷材料热态性能最好。

The thermal deformation of high-speed motorized spindle is an important factor affecting machining accuracy.In order to reduce the temperature rise and axial thermal elongation of the motorized spindle,the heat source and thermal boundary conditions of a certain motorized spindle were analyzed,the thermal-structure coupling simulation was carried out by using ANSYS Workbench software,the motorized spindle temperature field and thermal structure coupling field were obtained.An experimental platform was built to test the temperature field and axial thermal elongation of the motorized spindle system to verify the correctness of the finite element model.Finally,38CrMoAl,ZrO_(2),Si_(3)N_(4) and glass ceramics were selected as spindle materials for comparative analysis of thermal structure coupling.The results show that ceramic material is superior to steel in thermal properties,and glass ceramic material has the best thermal performance.