转向节闭式挤锻工艺多目标优化设计-北京工业大学学报.PDFVIP

第41卷 第7期 北 京 工 业 大 学 学 报 Vol.41 No.7 2015年 7月 JOURNAL OF BEIJING UNIVERSITY OFTECHNOLOGY Jul. 2015 转向节闭式挤锻工艺多目标优化设计 周摇 杰,齐文涛,陶亚平,曹金豆 (重庆大学 材料科学与工程学院,重庆摇 400044) 摘摇 要:针对现有转向节成形过程中出现的材料利用率低、能耗大等问题,提出闭式挤压制坯-模锻新工艺. 首先 简述闭式挤压制坯的工艺优势和重要的结构参数;其次通过正交试验设计,选择适当的设计参数样本以及响应值, 将遗传算法应用在以对数路径函数为核函数的增强RBF近似模型上进行优化,得到优化的挤压工艺参数:圆角半 径R=10mm,挤压长度a=112mm,冲头凸模两侧预留距离b=83mm、c=72mm;最后通过有限元模拟和生产实践 验证,证明了该方法很好地解决了汽车转向节闭式挤锻工艺中充型不满的问题. 关键词:转向节;闭式挤锻;增强的径向基函数;遗传算法 中图分类号:TG376郾2 文献标志码:A 文章编号:0254-0037(2015)07-1108-06 doi:10.11936/ bjutxb2014100030 Closed Extrusion鄄die Forging Process of Steering Knuckle for Multi鄄objective Optimization Design ZHOUJie,QI Wen鄄tao,TAO Ya鄄ping,CAOJin鄄dou (College of Materials Science and Engineering,Chongqing University,Chongqing400044,China) Abstract:A formingprocesscalledclosedextrusionblankforming dieforging isputforwardcreatively to solve problems of the knuckle forming process such as low material utilization and high energy consumption. Firstly advantages and key structure parameters of the closed extrusion were discussed in this paper. Orthogonalexperimentaldesignwasappliedtoselecttheappropriatedesignparametersforthe FEM experiments and the RBF meta鄄models which used Logarithmic鄄path function as kernel functions were obtained .The genetic algorithm was introduced into the approximate model to carry out the multi鄄 objective optimization. The following parameters are the optimal die parameters of closed extrusion: corner radius of bar蒺srootR =10,length of squeeze a=112mm,and reserved rangefor two sidesof the punch b = 83 mm, c =72 m. Feasibility of the process is proved by finite element simulation and