锻压技术

汽车加强板冲压模芯磨损分析及工艺参数优化

英文标题：Wear analysis and process parameter optimization on stamping die core for automobile reinforcing plate

作者：董竹林1 李永锋2

分类号：TG386.41

出版年,卷(期):页码：2024,49(6):102-109

摘要：

针对BR1500HS高强钢加强板热冲压过程中凹模模芯磨损量大的问题，利用Deform有限元软件进行了加强板的热冲压磨损分析。通过建立高强钢的材料模型并应用Archard修正模型来准确预测模芯的磨损行为，选取对模芯磨损影响较大的板料加热温度、模芯预热温度、冲压速度以及模具间隙4个因素作为优化变量，以模芯最大磨损深度为优化目标，结合响应面理论建立了各变量关于优化目标的二阶响应面回归分析模型，得到了模芯最大磨损深度随各变量的变化规律。模型寻优后确定的最佳工艺参数为：板料加热温度为680 ℃、模芯预热温度为380 ℃、冲压速度为45 mm·s-1、模具间隙为2.25 mm。采用优化后的参数进行实际冲压试验，模芯寿命提高了32.2%，解决了模芯磨损严重的问题。同时，实际模芯寿命与响应面模型预测值和有限元模拟预测值相近，验证了建模及优化结果的准确性。

For the large wear amount of die core in the hot stamping process of BR1500HS high-strength steel reinforcing plate, the hot stamping wear of reinforcing plate was analyze by finite element software Deform, and the wear behavior of die core was accurately predicted by establishing the material model of high-strength steel and applying the Archard modified model. Then, taking the heating temperature of sheet metal, pre-heating temperature of die core, stamping speed and die clearance as the optimization variables, which had a significant impact on the wear of die core, and taking the maximum wear depth of die core as the optimization objective, a second-order response surface regression analysis model for each variable regarding the optimization objective was established by using response surface theory, the variation rule of the maximum wear depth of die core with each variable was obtained. After optimizing the model, the optimal process parameters were determined as the heating temperature of sheet metal of 680 ℃, the pre-heating temperature of die core of 380 ℃, the stamping speed of 45 mm·s-1 and the die clearance of 2.25 mm. Furthermore, the actual stamping tests were conducted by the optimized parameters, and the life of die core was increased by 32.2%, solving the problem of severe wear of die core. At the same time, the actual life of die core was similar to the predicted values of response surface model and finite element simulation, verifying the accuracy of the modeling and optimization results.

基金项目：

山西省交通运输厅科技计划项目（2012-1-24）

作者简介：董竹林（1982-），女，硕士，讲师,E-mail：dzl198206@163.com;通信作者：李永锋（1982-），男，博士，副教授,E-mail：lantian9980_@163.com

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