高速电主轴热误差实验与预测建模

数控加工中心采用高速电主轴,由于电主轴发热导致主轴工作端明显热延伸,严重影响加工精度。以数控精雕机用永磁同步电主轴为研究对象,通过建立热特性实验平台,测试电主轴在不同转速、不同工作条件下的特征温度和热误差数据,建立基于自然指数函数的电主轴轴向热误差预测模型。在不同的工况下对模型的补偿结果进行实验验证,验证结果表明:该预测模型简单、精度较高,且建模成本较低,可以快速应用到实际的加工环境中。

Thermal Error Experiment and Prediction Modeling for High-speed Motorized Spindle

In CNC machining center,high-speed motorized spindle is used,the motorized spindle heating leads to obvious thermal extension of the spindle working end,seriously affecting the machining accuracy.Taking the permanent magnet synchronous motorized spindle used in CNC precision engraving machine as the research object,the characteristic temperature and thermal error data of motorized spindle under different rotating speed and working modeswere tested by setting up the thermal characteristic experiment platform,and the prediction model of axial thermal error of motorized spindle based on natural exponential function was established.The experimental verification of the compensation results of the model under different working conditions shows that the prediction model is simple,high precision,low modeling cost,and can be quickly applied to the actual processing environment.