汽车引擎盖棱线拉延成形滑移线缺陷的工艺优化

Process optimization for slip-line defects in automobile hood edge drawing

针对汽车引擎盖外板拉延成形在锐棱处容易产生滑移线缺陷的问题,对可能产生外观缺陷的工艺参数进行了研究。首先运用单因素变量法,研究了压边力、摩擦因数、拉延筋强度、冲压方向对引擎盖外板拉延成形的影响,确定了各因素对滑移线影响的主次顺序和大致拉延成形良好的范围。再利用正交试验方法和极差分析,寻求最优水平组合。研究结果表明:应用数值模拟技术能够提高引擎盖外板成形质量,减少试模次数、缩短生产周期、降低生产成本。合理的工艺参数组合可以对滑移线缺陷进行优化,增加了对滑移线缺陷进行控制的方法。

Aiming at the problem that the slip line defects are easy to occur at the sharp edges in the drawing process of automobile hood outer panel,the process parameters that may cause appearance defects were studied.Firstly,the influence of blank holder force,friction coefficient,drawbead strength and stamping direction on the forming of engine hood outer panel is studied by using the single factor variable method,and the primary and secondary order of each factor affecting the slip line and the approximate range of good drawing forming are determined.Then,orthogonal experiment method and range analysis are used to find the optimal level combination.The research results show that the application of numerical simulation technology can improve the forming quality of engine hood outer plate,reduce the number of die tests,shorten the production cycle and reduce the production cost.The reasonable combination of process parameters can optimize the slip line defects and increase the control method of slip line defects.