转向节闭式挤锻工艺多目标优化设计  

Closed Extrusion-die Forging Process of Steering Knuckle for Multi-objective Optimization Design

作　　者：周杰[1] 齐文涛[1] 陶亚平[1] 曹金豆 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《北京工业大学学报》2015年第7期1108-1113,共6页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51275543)

摘　　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=10 mm,挤压长度a=112 mm,冲头凸模两侧预留距离b=83 mm、c=72 mm;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.A forming process called closed extrusion blank forming＆amp;die forging is put forward creatively 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. Orthogonal experimental design was applied to select the appropriate design parameters for the FEM experiments and the RBF meta-models which used Logarithmic-path function as kernel functions were obtained . The genetic algorithm was introduced into the approximate model to carry out the multi-objective optimization. The following parameters are the optimal die parameters of closed extrusion：corner radius of bar’s root R=10, length of squeeze a=112 mm, and reserved range for two sides of the punch b =83 mm, c =72 m. Feasibility of the process is proved by finite element simulation and production practice,and it indicates that this process can solve the knuckle’s filling discontent problem under the closed extrusion-die forging process.

关 键 词：转向节 闭式挤锻 增强的径向基函数 遗传算法 

分 类 号：TG376.2[金属学及工艺—金属压力加工]