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高速压力机曲轴热态有限元模型的准确建立对高速压力机在虚拟环境下的理论研究有着重要的意义。以有限元方法为基础,建立基于接触热阻这一边界条件的曲轴热模型,并进行温度场和热变形分析。通过电涡流传感器对曲轴实际的热变形量进行实验测量,实验结果表明,考虑接触热阻的有限元模型分析结果更接近实际工况,理论分析误差由14.46%降低到2.37%。因此考虑接触热阻这一边界条件的主轴热态有限元模型更能准确反映高速压力机曲轴的热特性,有限元模型更加合理。
The accurate establishment of the high temperature press crankshaft finite element model is of great significance to the theoretical research of high speed press under the virtual environment. Based on the finite element method, a crankshaft thermal model based on the boundary conditions of contact thermal resistance was established, and the temperature field and thermal deformation were analyzed. The actual thermal deformation of the crankshaft was measured by eddy current sensor. The experimental results show that the finite element model considering the contact thermal resistance is closer to the actual working condition, and the theoretical analysis error is reduced from 14.46% to 2.37%. Therefore, considering the boundary condition of thermal resistance, the thermal state of the spindle of the high-speed press can be more accurately reflected by the finite element model of the spindle, and the finite element model is more reasonable.