Transactions of Materials and Heat Treatment

Title：Die forging technology for sliding fork

Authors： Cheng Junwei Chang Shichao Liu Qiyong Chen Xile Guo Yanjun

Unit： School of Materials Zhengzhou University of Aeronautics State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Xuchang Zhongxing Forging Co. Ltd.

KeyWords： sliding fork die forging split pre-forging final forging

ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(11):22-27

Abstract：

The main process difficulties for fork forgings are to split fork which has lower material utilization. Therefore, through the analysis on the shape and metal distribution law of a certain type of short hollow shaft sliding fork, the die forging idea of bending U-shaped fork and extruding hollow rod was proposed, and a five-step die forging process scheme was proposed. A compound deformation of bending and extrusion was conducted in the pre-forging. The blank was bent into U-shape under the action of punch, and the part of rod was extruded. In the final forging, the shape of pre-forgings was used for positioning, the hollow rod was extruded, and the U-shaped fork was shaped. Then, the deformation processes of pre-forging and final forging were simulated to verify the correctness of theoretical analysis. Furthermore, based on the forming scheme, the forging mold was designed and manufactured, and the qualified forgings were gotten. Using the designed process, the problem of uneven material flow was avoided caused by the open extrusion split process, and the hollow rod was extruded at same time, which reduced the material consumption and the subsequent machining quantity. In addition, the flash and punched skins produced by die forging could be removed by the mold. Relative to the conventional horizontal placing open die-forging process, the material utilization rate is improved by about 15%. Thus, the scheme has certain guiding significance for production.

Funds：

材料成形与模具技术国家重点实验室开放课题研究基金（P2019-016）；河南省高等学校重点科研项目计划（17A460027）；许昌市转型升级创新专项（20200111022）

作者简介：程俊伟（1973-），男，博士，教授，E-mail：hustcjw@163.com

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