基于响应面法的钩尾框渐进热弯曲工艺多目标优化  

Multi-object optimization of incremental hot bending process of hook tail frame based on RSM

作　　者：夏玉峰[1] 杨显红[1] 郑晓凯[1] 陈邦华[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《中南大学学报（自然科学版）》2014年第9期2977-2984,共8页Journal of Central South University:Science and Technology

基　　金：中央高校基本科研业务费科研专项资金资助项目(CDJZR12130045)

摘　　要：根据某锻造厂生产某型号钩尾框弯曲工艺中出现弯曲载荷过大、根部拉伤以及平板根部变薄严重的问题,提出一种新型厚板渐进热弯曲工艺。以降低弯曲载荷、降低根部出现裂纹趋势以及保证钩尾框平板厚度合理为优化目标,并以凸模速度、副辊尺寸、辊与坯料间摩擦因素以及主副辊在高度和水平方向的距离为优化变量,采用正交实验与Design-expert软件进行响应面(RSM)拟合建模分析,得到3个目标量的二阶响应面模型,并通过数值模拟验证所建立的响应面模型准确性,其相对误差小于8%,可用于后续优化。生产实践结果表明,通过多目标优化后钩尾框新型渐进弯曲模结构可以把弯曲载荷力降低40%,能够有效降低根部出现裂纹趋势保证平板最小厚度。According to the issue that too large bending load, root injury and severe thinning of tablet root would emerge during the process of a certain type of hook tail frame produced by a forging factory, a novel thick plate incremental hot bending process was put forward. The optimization goal was to reduce the bending load and crack trend in the roots, and to ensure the thickness of hook tail frame. The punch velocity, the size of auxiliary roller, the friction factor between roller and billet, the distance of auxiliary roller in the direction of the height and level were the optimization variables. The orthogonal experiment and the design-expert software were made to analyse the response surface model（RSM） and the second order response surface model of three goals and optimal value were obtained. The production practice results show that through multi-objective optimization, the new incremental bending structure model of hook tail frame can reduce the forming load force by 40%, effectively lessen the trend of cracks on the roots and ensure the minimum thickness of plates.

关 键 词：厚板热弯曲 渐进弯曲 有限元模拟 响应面法 多目标优化 

分 类 号：TG316[金属学及工艺—金属压力加工]