汽车铆螺母冷锻成形数值模拟及优化  

Numerical simulation and optimization on cold forging for automotive rivet nut

作　　者：柳铮 钟绍华[1] 桂航 朱军 Liu Zheng;Zhong Shaohua;Gui Hang;Zhu Jun(School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Zhejiang Fangquan Automotive Standard Parts Limited Company,Jiaxing 314300,China)

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]浙江方泉汽车标准件有限公司,浙江嘉兴314300

出　　处：《锻压技术》2020年第10期13-20,共8页Forging & Stamping Technology

基　　金：企业横向项目(61192301)。

摘　　要：针对某型号汽车铆螺母模具寿命短的问题,分析了现有的原始成形方案存在的问题,并提出一种优化的冷锻成形方案,即通过转移重要工位零件变形量来减少相应工位模具的应力。然后,以降低模具局部最大应力为优化目标,选取凸模下压速度、凸模锥角、凹模锥角、摩擦系数作为变量,设计正交试验,并通过多次模拟计算得到了成形工艺参数的最优水平组合为:凸模下压速度为240 mm·s-1,凸模锥角为120°,凹模锥角为60°,摩擦系数为0.09。最后,分别运用数值模拟及试验的方法,对冷锻成形方案及最优工艺参数组合进行了验证。研究结果表明:运用优化后的方案及最优工艺参数组合指导冷锻加工,能够有效减小模具应力、延长模具寿命。For the short life problem of mold for a certain automotive rivet nut,the problems of existing original forming scheme were analyzed,and an optimized cold forging scheme was proposed to reduce the stress of mold at the corresponding station by transferring the part deformation amount of important station.Then,taking the reduction of the local maximum stress for mold as the optimization goal,taking punch speed,punch cone angle,die cone angle and friction coefficient as the variables,an orthogonal test was designed,and the optimal level combination of forming process parameters with the punch speed of 240 mm·s-1,the punch cone angle of 120°,the die cone angle of 60°and the friction coefficient of 0.09 were obtained through multiple simulation calculations.Finally,the cold forging scheme and the combination of optimal process parameters were verified by the numerical simulation and test.The results show that using the optimized schemes and process parameters to guide cold forging processing effectively reduces mold stress and extends mold life.

关 键 词：汽车铆螺母 冷锻成形 模具寿命 应力 正交试验 

分 类 号：TG376.3[金属学及工艺—金属压力加工]