Temperature Field and Extrusion Load in Needle Piercing Extrusion Process Based on Ingot Billet for Large 7075 Aluminum Alloy Tube

Abstract:

Abstract. The change rules of the billet temperature field and extrusion load are the significant basis for the optimal design of the needle piercing extrusion process based on ingot billet for the manufacture of large-diameter thick-walled tube. Taking the needle piercing extrusion process of a 7075 aluminum alloy tube with sizes of Φ500mmx400mm/6000mm as study object, we developed a precise FE model for the process under DEFORM-2D environment, then numerically revealed the distributions and evolution rules of the billet temperature field, and obtained the effects of the extrusion speed and initial billet temperature on the billet temperature filed and extrusion load. The results show that the peak extrusion load decreases linearly with the increase of initial billet temperature but is insensitive to the extrusion speed, and that the peak temperature rises with the increase of the extrusion speed and initial billet temperature, and always locates on the surface of the initially extruded tube close to the exit of the cavity die.

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 1734-1739
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.1734
• Online since: November 2012
• Authors: Liang Gang Guo*, Ke Ke Dong, He Yang, Wen Da Zheng, Jun Zhang
• Keywords: As-Cast 7075 Aluminum Alloy, Large-Diameter Thick-Walled Tube, Needle Piercing Extrusion, Numerical Simulation

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