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根据圆锥滚子热斜轧成形过程中的特点以及轧件的受力状态分析,改进了传统的Lemaitre损伤模型,充分考虑了正、负静水压应力状态下损伤演化的差异性,以及应变速率和变形温度变化对损伤演化的影响。将改进的Lemaitre损伤模型借助SIMUFACT平台的二次开发技术嵌入到圆锥滚子孔型斜轧有限元模型中,创建了圆锥滚子孔型斜轧的损伤预测模型。同时,采用同样的建模技术建立了轴承钢球孔型斜轧损伤预测模型,并与文献中的实验结果对比,验证了改进的Lemaitre损伤模型的可靠性。圆锥滚子孔型斜轧损伤预测模型的模拟结果表明,圆锥滚子热斜轧过程中损伤程度较大的区域主要为连接颈轴心及靠近连接颈轴心的区域,而且滚子小端心部损伤程度明显大于滚子大端。
According to the characteristics of the tapered roll during the hot rolling process and the analysis of the stress state of the rolling element, the traditional Lemaitre damage model is improved. The difference of damage evolution under positive and negative hydrostatic stress conditions and the strain rate And deformation temperature changes on the damage evolution. The improved Lemaitre damage model is embedded in the tapered roller taper rolling finite element model with the secondary development technology of SIMUFACT platform to create the damage prediction model of tapered roller taper rolling. At the same time, the same modeling technique was used to establish the prediction model of the ball-grid-typed rolling bearing damage. Compared with the experimental results in the literature, the reliability of the improved Lemaitre damage model was verified. The simulation results of the prediction model of the tapered roller taper rolling damage show that the areas of greater damage in the taper roller taper rolling are mainly connected to the neck shaft center and the area near the neck shaft center and the small end of the roller Department of injury significantly greater than the big roller.