基于克里金模型和遗传算法的楔横轧连杆毛坯优化  

Optimization on cross wedge rolling connecting rod blank based on Kriging model and genetic algorithm

作　　者：黄超群[1] 来飞 Huang Chaoqun;Lai Fei(Institute of Intelligent Manufacturing and Automotive,Chongqing Technology and Business Institute,Chongqing 401520,China;Vehicle Engineering Institute,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆工商职业学院智能制造与汽车学院,重庆401520 [2]重庆理工大学车辆工程学院,重庆400054

出　　处：《锻压技术》2020年第8期99-105,共7页Forging & Stamping Technology

基　　金：重庆市教委科学技术研究项目资助(KJ1603809);重庆工商职业学院科研项目(ZD 2016-01)。

摘　　要：以DEFORM-3D数值模拟和遗传算法为手段,以连杆楔横轧制坯工艺作为研究对象,将展宽角、成形角、第一把楔的高度、初始坯料温度作为设计变量,将第一主应力作为优化目标,利用克里金模型构建设计变量和优化目标之间的映射关系,利用遗传算法对克里金模型进行全局寻优。得到了连杆毛坯楔横轧工艺的最优参数组合,即展宽角为32°、成形角为8.99°、第一把楔的高度为6.21 mm、初始坯料温度为1200℃。最后,将得到的最优工艺参数用于数值仿真和实验验证。结果表明,优化后的工艺参数使得中心区域最大第一主应力从77 MPa下降至35 MPa,并且消除了原有工艺毛坯中心区域出现的裂纹缺陷。Using numerical simulation DEFORM-3 D and genetic algorithm as the means,for the blank making process of cross wedge rolling for connecting rod,taking the widening angle,the forming angle,the height of the first wedge and the initial temperature of blank as the design variables and taking the first principal stress as the optimization goal,the mapping relationship between the design variables and the optimization goal was constructed by the Kriging model,and the Kriging model was optimized globally by the genetic algorithm.Then,the optimum parameter combination of the cross wedge rolling process for connecting rod blank was obtained with the widening angle of 32 °,the forming angle of 8.99 °,the height of the first wedge of 6.21 mm,and the initial temperature of blank of 1200 ℃ which were used in the numerical simulation and the experimental verification.The results show that the optimized process parameters reduce the maximum principal stress in the central area from 77 MPa to 35 MPa and eliminate the crack defects in the central area of blank by the original process.

关 键 词：楔横轧 连杆 制坯工艺 克里金模型 遗传算法 主应力 

分 类 号：TG335[金属学及工艺—金属压力加工]