Transactions of Materials and Heat Treatment

Title：Research on mechanism of orifice folding defect in cold heading molding for flange welding nut

Authors： Li Kebin1 Sun Yukun1 Yu Yongguang2 Wang Shuqin3

Unit： 1. Key Laboratory of E & M（Zhejiang University of Technology） Ministry of Education & Zhejiang Province 2.Zhejiang Liming Engine Parts Co. Ltd. 3. Zhejiang University of Science and Technology

KeyWords： cold heading molding orifice folding flange welding nut

ClassificationCode：

year,vol(issue):pagenumber：2016,41(4):5-9

Abstract：

The orifice folding defect often happens during the practical manufacturing of flange welding nuts by cold heading molding. The FEM simulation analysis combined with experiment on the defects was adopted. At first, the process plan was made according to the equipment's requirement of the company and the cost of the product. Secondly, the metal flow process during the manufacturing of the flange welding nut by cold heading molding was dynamically studied by Deform-3D FEM software, and the mechanism was obtained. Furthermore, the factors influencing the defect were studied systematically. At last, the mechanism and factors were tested and verified by experiments, and based on which, improvement measures were put forward. The results show that the orifice folding is formed by metal refluxing when the metal on inner cylindrical surface flows to the flange and the metal above flows down during the manufacturing by cold heading molding. If the extent of folding is serious, there will be a defect. The orifice folding is unavoidable, but the extent of folding can be controlled by optimizing the technique.
Key words: cold heading molding; orifice folding; flange welding nut

Funds：

浙江省重点科技创新团队项目(2010R50002)

李克彬（1973-），男，硕士，副教授

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