Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (11): 145-150.

• Mechanical Engineering • Previous Articles     Next Articles

Numerical Simulation of Metallic Flow Forming via Extrusion in Pocket and Porthole Dies

Zhou Zhao-yao1  Pan Jtan-yi1  Wang Yao1  Tan Chi-dong2  Chen He-ai 2   

  1. 1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Xingshun Precision Dies Co. , Ltd. , Foshan 528061, Guangdong, China
  • Received:2008-10-27 Revised:2009-04-07 Online:2009-11-25 Published:2009-11-25
  • Contact: 周照耀（1965-），男，教授，博士生导师，主要从事模具设计与制造、精密成形、数值模拟研究． E-mail:zhyzhou@scut．edu．cn
  • About author:周照耀（1965-），男，教授，博士生导师，主要从事模具设计与制造、精密成形、数值模拟研究．
  • Supported by:

    广东省教育部产学研结合项目（2006D90304005）;粤港关键领域重点突破项目（20082007）

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Abstract:

Two models to analyze the aluminium alloy extrusion in the pocket and the porthole dies are respectively established, and the distributions of stress and velocity field of the billet respectively in the two dies during the extrusion are then compared and analyzed using the finite volume method （FVM）. The results indicate that the stress distribution of the billet is not directly related to the height of the die bearing and the flow equilibrium of the material, while the adjustment of the die bearing plays a certain role in the improvement of metal flow. Aiming at the flow equilibrium of the material at the outlet, a criterion is then proposed to judge whether stable qualified products can be obtained by the extrusion. Moreover, the standard deviation of the velocity field （SDV） at the outlet is calculated. The results show that, when the SDV decreases with the increase in time to less than a critical convergence value, stable qualified products can be obtained.

Key words: aluminium alloy extrusion, pocket die, porthole die, numerical simulation, finite volume method