Transactions of Materials and Heat Treatment

Title：Study on die forging for 19 inch TBM disc hob ring

Authors： Zhang Xuhui1 Liu Xin Tan Tao Li Mi Wen Dongxu

Unit： 1.College of Engineering and Design Hunan Normal University 2.State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

KeyWords： disc hob ring die forging metal streamline temperature field stress field strain field

ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(6):17-25

Abstract：

In order to study the change laws of die forging process for 19\|inch TBM disc hob ring, the changes of forming load, hob ring shape and metal streamline in the die forging process for disc hob ring under the forming conditions of initial forging temperature of 1150 ℃ and forming speed of 25 mm·s-1 were analyzed by finite element analysis software DEFORM. The results show that the die forging process of hob ring is composed of three stages: initial stage, middle stage and final stage. The metal blank does not fill the mold symmetrically up and down, the filling speeds of upper and lower mold cavities are different, and the upper mold cavity is filled before the lower mold cavity. During the die forging process, the overall temperature of hob ring decreases. And the temperature at blade decreases the least by 7.8% compared with the initial forging temperature. However, the temperature at arc transition zone of hob ring decreases the most by 34.78% compared with the initial forging temperature. Furthermore, the stress of hob ring increases gradually from inside to outside, and the equivalent stress at blade is the largest, which is 13.54% higher than average equivalent stress.

Funds：

国家自然科学基金资助项目(52005179)；湖南省自然科学基金资助项目(2020JJ5365)；湖南省教育厅科学研究项目(20C1153)；大学生创新训练项目(S202010542022)

张旭辉(1989-),男,博士,讲师 Email：xuhui@hunnu.edu.cn 通信作者：李密(1989-),男, 博士研究生 Email：limi_gsy@hunnu.edu.cn

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