Numerical simulation of the extrusion forming process of industrial pure aluminum tubes
In order to solve the problems of poor welding,out-of-size,uneven wall thickness and sub-standard mechanical properties in the process of continuous extrusion of refrigerated aluminum tube,DEFORM-3D finite element software was used to numerically simulate the extrusion process of alu-minum tube,and to analyze the effects of extrusion temperature and velocity on temperature field,stress field and grain size,providing guidance for the optimization of extrusion process parameters.The results show that when the extrusion speed is constant,the outlet temperature of the sizing zone increases with the increase of the preheating temperature of the blank,the stress decreases with the increase of the extrusion temperature,and the average grain size increases with the increase of the extrusion tempera-ture.When the extrusion temperature is constant,the temperature of the die hole increases with the in-crease of the extrusion speed,the stress peak increases first and then decreases with the increase of the extrusion speed,and the average grain size gradually decreases with the increase of the extrusion speed,and the grain size at the weld is smaller than that of the substrate.Under the simulated conditions,the optimum process parameters are 460 ℃,25 mm/s,and the grain sizes of aluminum tube and weld are 24.7 μm and 24.3 μm,respectively.
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NSTL
万方数据
维普
