• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (12): 92-98.doi: 10.3901/JME.2020.12.092

• 材料科学与工程 • 上一篇    下一篇

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基于水平集理论和Kriging模型的镁合金差温成形伪拉延筋设计及优化

谢延敏1, 岳跃鹏1, 冯美强1, 郭元恒1, 王东涛1, 祝云2   

  1. 1. 西南交通大学机械工程学院 成都 610031;
    2. 成飞集成科技股份有限公司 成都 610091
  • 收稿日期:2019-09-05 修回日期:2020-02-13 出版日期:2020-06-20 发布日期:2020-07-14
  • 通讯作者: 谢延敏(通信作者),男,1975年出生,博士,副教授。主要研究方向为先进塑性加工技术仿真和稳健设计等。E-mail:xie_yanmin@swjtu.edu.cn
  • 基金资助:
    国家自然科学基金(51005193)、四川省科技计划(2019YFG0313)和国家大学生创新创业训练计划(201910613017)资助项目。

Design and Optimization of Pseudo Drawbeads in Nonisothermal Stamping of Magnesium Alloys Based on Level Set Theory and Kriging Model

XIE Yanmin1, YUE Yuepeng1, FENG Meiqiang1, GUO Yuanheng1, WANG Dongtao1, ZHU Yun2   

  1. 1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031;
    2. Chengfei Integration Technology Co., Ltd., Chengdu 610091
  • Received:2019-09-05 Revised:2020-02-13 Online:2020-06-20 Published:2020-07-14

摘要: 压边圈结构对改善差温成形中压边圈摩擦、传热及材料的流动阻力起着重要的作用。利用水平集理论和Kriging模型,对镁合金差温成形中的压边圈结构进行优化,提出一种伪拉延筋。以NUMISHEET2011十字杯形件为研究对象,建立相应的热力耦合模型,利用相关的试验数据,对有限元模型进行验证。基于一步法理论反求影响镁合金成形件质量的压边圈关键区域,并对该区域进行了重新离散化及处理。以部分节点坐标为设计变量,以随机水平集值为目标,建立压边圈的Kriging水平集模型。利用初始水平集阈值,对伪拉延筋进行设计。利用拉丁超立方对水平集阈值、凸模温度和凹模温度进行抽样,获得伪拉延筋样本。基于镁合金差温成形热力耦合模型,对相应的样本进行有限元仿真分析,获得镁合金成形件的成形质量,建立水平集阈值与质量之间的Kriging模型。利用粒子群算法,对该Kriging模型进行优化,获得最佳水平集阈值,实现伪拉延筋的优化。利用最优伪拉延筋,进行相应的差温成形分析。研究表明,基于水平集理论和Kriging模型,优化伪拉延筋能有效地提高成形件的减薄率均匀性。该方法为压边圈设计提供一种有益的指导。

关键词: 差温成形, 水平集, Kriging模型, 粒子群算法, 伪拉延筋

Abstract: Blank holder structures play an important role in improving friction, heat transfer and material flow resistance in nonisothermal stamping. The blank holder structure in nonisothermal stamping for magnesium alloys is optimized by the level-set theory and Kriging models. A pseudo drawbead structure is proposed. A cross-shaped cup in NUMISHEET2011 is taken as a research object, and the corresponding thermal coupling model is established. The finite element model is verified by the relevant experimental data. Based on the one-step theory, the key area of the blank holder that affects the quality of the formed part is obtained and the area is re-discretized and processed. Partial node coordinates are used as design variables, and level-set values are used as objectives, so the Kriging model is established. Based on an initial level-set threshold, the pseudo drawbeads are designed. The level-set threshold, the temperature of the punch and the die are sampled by Latin hypercube, and the samples of the pseudo drawbeads are obtained. Based on the thermal coupling model in nonisothermal stamping, the finite element simulation is carried out to obtain the forming quality. The Kriging model between the level-set threshold and forming quality is established. By a particle swarm optimization algorithm, the Kriging model is optimized to obtain the optimal level-set threshold, so the pseudo drawbead is optimized. The nonisothermal forming simulation is carried out by the optimal pseudo drawbead. The research shows that the optimized pseudo drawbead can effectively improve the uniformity of the thinning rate in the formed part based on level-set theory and Kriging models. A useful guide for designing blank holders is provided by the method.

Key words: nonisothermal stamping, level set, Kriging model, particle swarm algorithm, pseudo drawbead

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