基于响应面法的机动车尾气后处理系统铝泵体的精锻工艺优化

针对机动车尾气后处理系统铝泵体精锻过程中出现的锻件凸台充填不完整、模具易开裂和飞边废料多等问题,建立了以锻件凸台端面充填率、终锻力比率和材料利用率为优化目标,以模具预热温度、坯料长度、坯料加热温度和飞边桥部高度为设计变量的二次多项式响应面模型。然后结合响应面法与差分进化算法对锻造参数进行优化,得到的最优锻造参数为:模具预热温度为350℃,坯料长度为83. 27 mm,坯料加热温度为490℃和飞边桥部高度为1. 15 mm。最后,采用最优锻造参数进行实际生产,生产出的锻件充填完整,提高了模具寿命和材料利用率。

Optimization on precision forging process for aluminum alloy pump housing in motor vehicle exhaust gas aftertreatment system based on response surface method

For the problems of insufficient filling for forging boss,easy cracking of die and excessive flash material in the precision forging process for aluminum alloy pump housing in motor vehicle exhaust gas aftertreatment system,the quadratic polynomial response surface model was built by taking the filling rate of end face for forging boss,the rate of final forging force and the material utilization rate as the optimization goals and the die preheating temperature,the billet length,the billet heating temperature and the flash bridge height as the design variables. Then,the forging paramenters were optimized by combining the response surface method with differential evolution algorithm,the optimized parameters of forging process were obtained with the die preheating temperature of 350 ℃,the billet length of 83. 27 mm,the billet heating temperature of 490 ℃ and the flash bridge height of 1. 15 mm. At last,the actual production with the optimized forging parameters was conducted,the forging was fully filled to improve the die life and material utilization.