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Abstract：
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According to the structure characteristics of the main shaft of a type of 13 t integral trailer support bridge, the neck-extruding technology for manufacturing the main shaft with a seamless steel tube was put forward. Then, the support capacity of the deformation zone of seamless steel tube was improved by controlling the temperature gradient precisely, and the coefficient of necking at the end was greatly reduced. Through the numerical simulation and practical experiment, the influences of metal flow status and key process parameters on the formability and wall thickness distribution of the metal during the forming process were obtained, and the value or range of the corresponding process parameters were optimized by combining with the shape-size of the main shaft and the manufacturability of extrusion with variable temperature. Furthermore, the practical experiments were conducted on a bidirectional extrusion hydraulic press, and the samples with qualified shape and size were obtained. In addition, the wall thickness distribution in deformation zone in each process basically agreed with that of the numerical simulation,
which indicates that the numerical simulation was reasonable and the forming process was feasible. Compared with the traditional process, the new technology realized the precision and quick forming of the main shaft with less heating passes and technical processes.
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Funds：
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国家自然科学基金资助项目（51374108）;河北省教育厅青年基金资助项目（QN2017410）；中央高校基本科研业务经费项目（3142015023）
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AuthorIntro：
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作者简介：李攀（1987-），男，博士，讲师
E-mail：lipanvc@163.com
通讯作者：罗建国（1977-），男，博士，副教授
E-mail:luojg_〖KG-*3〗1598@126.com
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Reference：
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