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为了改善超高强度钢板冲压件的加工质量,以某方形槽热冲压件为对象,以板料淬火温度、模具初始温度、冲压速度和模具间隙为设计变量,以冲压件成形温降、回弹量和成形减薄率3个质量指标为响应量,构建了热冲压加工质量指标的Kriging模型。在此基础上,以构建的Kriging模型为目标函数,建立超高强度钢板热冲压工艺参数多目标优化模型。应用第二代非支配遗传算法进行寻优计算,获得了优化的热冲压工艺参数:B1500HS超高强度钢板零件热冲压的最佳淬火温度为898.3℃,模具的初始温度为67.1℃,冲压速度为39.64 mm·s-1,模具间隙为2.2 mm。工艺参数优化后的验算结果表明,工艺参数优化后,成形温度更加均匀,回弹量减少25.6%,最大减薄率下降23%。
In order to improve the machining quality of ultra-high strength steel stamping parts, taking a square groove hot stamping as an object, taking sheet quenching temperature, initial mold temperature, stamping speed and mold clearance as design variables, Volume and rate of forming thinning rate of three quality indicators for the response to build a hot stamping quality indicators Kriging model. On this basis, the Kriging model is taken as the objective function to establish the multi-objective optimization model of hot stamping process parameters of ultra-high strength steel. The second generation of non-dominated genetic algorithm was used to optimize the calculation, and the optimal hot stamping process parameters were obtained. The optimum quenching temperature of hot stamping of B1500HS ultra-high strength steel parts was 898.3 ℃, the initial temperature of mold was 67.1 ℃, 39.64 mm · s-1, the die clearance is 2.2 mm. The optimized calculation results show that the forming temperature is more uniform after the optimization of process parameters, the rebound amount decreases by 25.6% and the maximum reduction rate decreases by 23%.