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Abstract：
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For the difficult in producing large-scale magnesium alloy thin-walled ring parts by traditional process, a new process of continuous flip extrusion for curved busbar channel was proposed. According to metal flow characteristics in forming process, the process scheme of multiple overturning forming was established to avoid the warping of billet, the mechanical analysis of the new process was conducted by principal stress method, and the forming process was numerically simulated by finite element software Deform. Furthermore, the forming force formula was verified, and the forming process and mold structure parameters were optimized by orthogonal experiment and based on the evaluation factor of deformation uniformity. The results show that considering the structural dimension of formed parts and the single deformation amount allowed by the new process, the billet needs to be flipped and extruded four times, and the expanding force formula and the maximum pressure formula with taper angle α of inner concave die as independent variable are derived. In addition, compared with the simulation results of FE Deform with α=20°，23° and 25°, the error is less than 10%. Finally, the extrusion process parameters are the extrusion speed of 1 mm·s-1 and the taper angle of inner concave die of 23°, and the die of the new extrusion process is designed to give a new way to realize the short process and low cost manufacturing of large-scale magnesium alloy thin-walled ring parts.
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Funds：
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国家科技重大专项项目（2019ZX04022001-004）
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AuthorIntro：
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刘杰(1993-)，男，硕士研究生，E-mail：liujie06082020@163.com；通讯作者：赵熹(1983-)，男，博士，副教授，E-mail：zhaoxi_1111@163.com
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Reference：
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