Transactions of Materials and Heat Treatment

Title：Development and application on small flash precision forging technology for

Authors： Zhang Yunjun Chen Tianfu Yang Jie Xia Juchen Deng Lei Jin Junsong

Unit： Hubei Tri-Ring Forging Co. Ltd. Huazhong University of Science & Technology

KeyWords： auto steering knuckle semi-closed small flash pre-forging semi-closed small flash final forging precision forging thermo-mechanical coupled finite element simulation

ClassificationCode：TG316

year,vol(issue):pagenumber：2018,43(8):1-7

Abstract：

For a type of steering knuckle with complexity degree S4, the new method of precision forging process was proposed by changing the traditional horizontal open pre-forging and the open big flash final forging into a semi-closed small flash pre-forging and a semi-closed small flash final forging. Based on the analysis of action and mechanism of small flash by classical plastic forming theory, the simulation analysis was carried out by the thermodynamics coupled finite element method, and the equivalent stress, equivalent strain and temperature distribution fields as well as the force forming curve and deformation law were obtained. Then, the correctness of the process scheme was verified, and the pre-forging process was optimized. Furthermore, the steering knuckle precision forgings were successfully manufactured by the program control hammer and CNC electric screw press, and the process test result was the same as the simulation result. The material utilization ratio of the new process scheme is 88%, which is 16% higher than that of the traditional process,and the forgings by the new process have better quality.

Funds：

湖北省技术创新专项重大项目（2017AAA009）

张运军（1966-），男，学士，高级工程师 E-mail：hbshdz@263.com

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