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

doi:10.3901/JME.2020.12.092

Abstract

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

CLC Number:

TG386

XIE Yanmin, YUE Yuepeng, FENG Meiqiang, GUO Yuanheng, WANG Dongtao, ZHU Yun. Design and Optimization of Pseudo Drawbeads in Nonisothermal Stamping of Magnesium Alloys Based on Level Set Theory and Kriging Model[J]. Journal of Mechanical Engineering, 2020, 56(12): 92-98.

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