Transactions of Materials and Heat Treatment

Title：Defect analysis and process improvement of cold extrusion for hexagonal joint

Authors： Wang Guanghui Li Mingyao Liao Shishao

Unit： Shanghai University of Engineering Science Dongfu Cold Forging Manufacturing Co. Ltd.

KeyWords： hexagonal joints cold extrusion numerical simulation defect analysis process improvement

ClassificationCode：TG376

year,vol(issue):pagenumber：2014,39(11):86-90

Abstract：

In actual production, serious wavy cracks were found on the hexagonal joints by once extrusion, which resulted in parts scrapped. The cold extrusion process of hexagonal joint was simulated based on Deform-3D software. The results show that once extrusion is the equivalent of a piercing process because the inner diameter of part is approximately equal to the inscribed circle diameter of hexagonal joint. In addition, the change of the shape leads to uneven flowing when the metal material flows from the cylinder to hexagonal prism. These two factors make the hexagonal surface of part appear wavy cracks. The results show that good parts can be obtained from in numerical simulations and by adding an intermediate process in actual production, namely, the hexagonal prism is gained by extrusion, and then the hole is obtained by the anti-extrusion.

Funds：

国家自然科学基金资助项目（51301105）；上海市高等教育内涵建设“085”工程(B-8932-13-0110)

王广卉（1989-），女，硕士研究生

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