Transactions of Materials and Heat Treatment

Title：Optimization design of die forging mold for slender non-axisymmetric workpiece with variable cross section

Authors： Yu Guicheng Ruan Jinhua Zhang Jianmin Zhang Hongyu Lin Jibin Guo Wanfu

Unit： Wuhan University of Science and Technology

KeyWords： die forging slender non-axisymmetric workpiece with variable cross section metal flow law equivalent stress equivalent strain pre-forging mold

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2022,47(10):229-235

Abstract：

The process of die forging after roll forging was proposed to produce slender non-axisymmetric sword strips with variable cross section, and the die forging process of sword strips was analyzed by finite element method. Then, for the die forging process of the most complex cross section of sword strips, the metal flow laws in the processes of one-pass die forging and two-pass die forging were compared. The results show that the metal deformation is large and unevenly distributed during the one-pass die forging process, and the maximum principal stress in the maximum equivalent strain region is tensile stress, which is prone to cracks. The maximum equivalent strain and its standard deviation for the cross section of the forgings are greatly reduced after pre-forging and finish forging, and the structure of pre-forging mold was optimized by the orthogonal experiment. The results show that the groove depth of upper mold has the most significant effect on the equivalent strain distribution for the cross section of the forgings. Compared with the one-pass die forging, the maximum equivalent strain and its standard deviation of the two-pass forming forgings after the optimization of pre-forging mold are significantly reduced. The above optimization method is used for the design on the other cross sections of die forging mold for sword strips, and the die forging mold that meets the actual production needs is designed and manufactured.

Funds：

国家自然科学基金青年科学基金资助项目（51701145）

余归城（1997-），男，硕士研究生，E-mail：guicheng@wust.edu.cn；通信作者：阮金华（1985-），男，博士，副教授，E-mail：Ruan_Jinhua@wust.edu.cn

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