Transactions of Materials and Heat Treatment

Title：Research on electromagnetic clinching process and mechanical properties of steel/Al joints

Authors： Wang Dayong1 Cong Yanjun1 Jiang Hao1 Liao Yuxuan1 Li Guangyao1 2 Cui Junjia1

Unit： 1.State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Body Hunan University 2.Shenzhen Automotive Research Institute (Shenzhen Research Institute of National Engineering Laboratory for Electric Vehicles) Beijing Institute of Technology

KeyWords： electromagnetic clinching steel/Al joints discharge energy mechanical property interlock value

ClassificationCode：TG306

year,vol(issue):pagenumber：2023,48(8):136-143

Abstract：

For AA5052 aluminum alloy sheet and DC52D+ZF high-strength steel sheet, the heading forming, microscopic morphology and mechanical properties of electromagnetic clinching joints under different discharge energies were studied. The results show that if the discharge energy value is too small, the deformation of rivets is insufficient, making it difficult to form a good interlocking structure. However, if the discharge energy value is too large, the flow of upper sheet material is too sufficient, and micro-cracks or even fractures appear in the neck area. In addition, the average interlock value Tu of electromagnetic clinching joint is 46.6% higher than that of the conventional hydraulic clinching joint. The hardness test results show that the hardness in the central area of electromagnetic clinching joint is slightly higher. The shear performance test results show that the shear performance of electromagnetic clinching joints is slightly higher than that of the conventional hydraulic clinching joints. Compared with the conventional hydraulic clinching joints, electromagnetic clinching joints have certain advantages in cross-sectional interlocking degree, microhardness and shear performance.

Funds：

国家自然科学基金资助项目 (52175315，51975202）；深圳市科技计划项目（KQTD20200820113110016）

作者简介：王大勇（1981-），男，硕士，高级工程师,E-mail：wangdy@hitrobotgroup.com;通信作者：崔俊佳（1983-），男，博士，教授,E-mail：cuijunjia@hnu.edu.cn

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