Transactions of Materials and Heat Treatment

Title：Study on the law of metal flow for hexagon hollow pieces in extrusion forming process

Authors： Li Zeyong Zhang Baohong Yu Jianmin Wang Hongwei Du Jiuwang

Unit： North University of China

KeyWords： hexagon hollow pieces cold extrusion metal flow law numerical simulation

ClassificationCode：TG376

year,vol(issue):pagenumber：2014,39(3):132-136

Abstract：

The difficult problem of extrusion forming for hexagon hollow pieces is the dimensional accuracy of hexagon hole and complicated law of metal flow. In order to improve the shape and dimension precision for hexagon hollow pieces, the cold forming process for hexagon hollow pieces was numerical simulated by using finite element software Deform-3D and rigid-plastic finite element method, and the law of metal flow in forming process was studied by using velocity vector. According to the simulated velocity and metal flow law, the forming process defects were predicted. The original billet was optimized by using numerical simulation, and the bottom of billet was changed into inner cone of 30°, so the questions of irregular front end of extrusion work pieces and out of tolerance of inner-hole dimension were sloved. Finally,the experiments were conducted to verify the simulation results, and the parts with qualified mechanical property，structure and dimension were obtained.

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Reference：

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