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为了解决皮卡尾门外板拉延过程中产生的破裂、起皱的问题,采用数值模拟和灰色关联法相结合的方法对拉延工艺参数进行优化。将料厚最大减薄率和最大增厚率作为优化目标,以圆角和直边段的拉延筋阻力系数、压边力、冲压速度、摩擦系数为工艺参数变量进行5因素4水平的正交试验。在Auto Form软件中进行有限元数值模拟。基于灰色关联分析法,计算出各工艺参数对破裂和起皱综合指标的关联度,给出了最优的工艺参数方案:圆角段拉延筋阻力系数为0.15,直边段拉延筋阻力系数为0.45,压边力为800 k N,冲压速度为3.5 m·s-1,摩擦系数为0.13。应用最优工艺参数组合进行模具制造和现场实际生产,得到了质量良好的冲压件,有效控制了破裂和起皱风险。
In order to solve the problem of rupture and crease during the drawing process of pickup tailgate, the drawing process parameters were optimized by the combination of numerical simulation and gray correlation method. Taking the maximum thickness reduction rate and the maximum thickening rate of the material as the optimization objectives, a five-factor, four-level positive model was established based on the drag coefficient, blank holder force, pressing speed and friction coefficient of the fillet and straight- Pay the test. Finite element numerical simulation in Auto Form software. Based on the gray relational analysis method, the correlation between each process parameter and the comprehensive index of rupture and wrinkling was calculated, and the optimal technical parameters were given. The drag coefficient of the drawbead in the fillet section was 0.15, The coefficient is 0.45, the blank holder force is 800 kN, the pressing speed is 3.5 m · s-1 and the friction coefficient is 0.13. Application of the best combination of process parameters for mold manufacturing and on-site actual production, get a good quality stamping parts, effectively control the risk of rupture and crease.