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针对某汽车行李舱门外板在成形过程中出现的破裂、起皱、厚薄不均以及成形不足的问题,提出Dynaform与响应面法相结合的协同优化策略。通过建立以摩擦因数、压边力、拉延筋阻力系数为优化变量,以破裂及起皱、厚薄均匀性和成形不足率为优化目标的二阶响应模型,并借助试验设计软件Design-e_(xpert与Matlab多目标优化工具箱得到最优工艺参数组合:摩擦因数_(x1)(0.14),压边力_(x2)(2.05 MN),拉延筋1的阻力系数_(x3)(7%),拉延筋2的阻力系数_(x4)(26%)。对优化后的工艺参数进行再模拟和生产实践验证,运用优化后的工艺参数生产的冲压件无破裂起皱、厚薄均匀,成形不足的问题得到解决,表明提出的策略对解决冲压成形质量常见问题具有实际意义。
Aiming at the problems of rupture, wrinkling, uneven thickness and insufficient forming during the forming process of the outer panel of a car luggage compartment door, a synergetic optimization strategy based on Dynaform and response surface method is proposed. By establishing the second-order response model with optimization of friction coefficient, blank holder force and drawbead resistance coefficient, the second-order response model is optimized with crack and wrinkle, thickness uniformity and low forming rate. With the design software Design-e_ xpert and Matlab multi-objective optimization toolbox to obtain the optimal combination of process parameters: the friction coefficient _ (x1) (0.14), the blank holder force _ (x2) (2.05 MN), the drag coefficient of drawbead 1 %), The drag coefficient of drawbead 2 (x4) (26%). The optimized process parameters were re-simulated and verified by production practice. The pressed parts produced by the optimized process parameters had no crack wrinkles and even thickness , The problem of insufficient forming was solved, indicating that the proposed strategy has practical significance for solving common problems of stamping quality.