Transactions of Materials and Heat Treatment

Title：Numerical simulation analysis and research on loosening prevention of bolt connection in mold forming

Authors： Yao Qiuhua Li Rubin Tang Fang

Unit： CRRC Zhuzhou Electric Co. Ltd.

KeyWords： double nut mold forming loosening prevention process cracking DEFORM-3D

ClassificationCode：TG376

year,vol(issue):pagenumber：2019,44(12):70-76

Abstract：

Based on the requirements of loosening prevention for one type of motor stator core stud bolt, a scheme of loosening prevention for the radial mold forming of process nut and external thread of bolt respectively was put forward by the double nuts and the combination with different molds, and 1# and 2# molds were equipped by the manual hydraulic molding tools. Then, the external thread of bolt and the process nut were formed by radial molding under the setting process parameters respectively. Therefore, the external thread circumference of bolt was molded at intervals of 90°, and the circumference of process nut was molded once. At the same time, the quality of mold forming was inspected by the magnetic detection and penetration testing and the micro-cutting inspection. The results show that no cracks are found in bolts and process nuts. Furthermore, the mold forming process was simulated by finite element software DEFORM-3D, and the stress and deformation of process nuts and bolts were analyzed, namely, the maximum stresses of process nut and bolt are 761 MPa and 382 MPa, respectively. Thus, the above values are all less than the tensile strength of each corresponding material, and the process nuts and bolts do not crack. The experiment and simulation results show that the mold forming simulation results are consistent with the actual mold forming results, and the process nuts and bolts do not crack. Finally, the effect of loosening prevention can effect meet the requirements of use.

Funds：

国家重点研发课题项目（2016YFB1200506-15）

姚秋华（1983-），男，硕士，高级工程师 E-mail：kevin_yqh@126.com

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