车窗升降板弯曲成形回弹缺陷的影响因素分析与成形工艺优化

发布时间：2018-06-08 20:10

本文选题：车窗升降板 + 弯曲成形　；参考：《锻压技术》2017年05期

【摘要】：针对弯曲件汽车车窗升降板在成形过程中因板料弹性回复和残余应力的存在易产生回弹而影响零件尺寸和装配性能的问题,借用Dynaform平台对板料弯曲成形过程进行数值模拟及回弹预测。针对板料厚度A、冲压速度B、摩擦因数C和模具间隙D等4项影响因素设计9组不同的成形工艺参数组合,分别对板料进行正交试验和重复正交试验(重复次数S=3)获取回弹结果,并采用极差分析法(方案1)和方差分析法(方案2)进行影响因素的主次排序和工艺优化。方案1和方案2分别获得的影响因素主次顺序和优化工艺参数组合为ABDC,A_2B_2D_3C_2和BDCA,B_2D_3C_2A_1。将两组工艺参数进行对比验证,进而确定最佳参数组合为板料厚度A=0.9 mm,冲压速度B=5000 mm·s~(-1),摩擦因数C=0.125,模具间隙D=1.15。利用该工艺进行试生产,检测零件危险圆角处厚度为t=0.70 mm,减薄率低于25%。经过试装配证明,采用优化后工艺参数成形的零件能够满足其使用条件下的尺寸和装配要求。
[Abstract]:In order to solve the problem that the elastic recovery of sheet material and the existence of residual stress in the forming process of the car window of the bending parts, the size and the assembly performance of the parts are affected easily by the elastic recovery of the sheet material and the existence of the residual stress. The Dynaform platform is used to simulate the bending process of the sheet material and predict the springback. The sheet thickness is A, the stamping speed is B, the friction factor C and the die are used. 4 factors such as gap D are designed to design 9 groups of different forming process parameters. Orthogonal test and repeated orthogonal test (repetition times S=3) are used to obtain the rebound results respectively. The main and secondary order and process optimization of the influencing factors are carried out by the extreme analysis method (scheme 1) and variance analysis (scheme 2). Scheme 1 and scheme 2 are obtained respectively. The main and secondary order of the influencing factors and the combination of optimized process parameters are ABDC, A_2B_2D_3C_2 and BDCA. B_2D_3C_2A_1. is used to verify the two sets of process parameters, and the optimum combination of the parameters is A=0.9 mm, the stamping speed B=5000 mm. S~ (-1), and the friction factor is C=0.125. The thickness of the dangerous round corner is t=0.70 mm, the thinning rate is lower than 25%., and the test assembly proves that the parts formed by the optimized process parameters can meet the size and assembly requirements under the conditions of use.
【作者单位】：贵州大学机械工程学院;
【基金】：贵州大学研究生创新基金(研理工2016031) 数字化精密成形技术及装备研究生创新实践基地(贵大研CXJD[2014]001)
【分类号】：TG386

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