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Numerical simulation of solidification process of Sn-3.5%Pb hollow billet with stirring magnetic field ZHANG Qi(张 琦), WANG Tong-min(王同敏), LI Ting-ju(李廷举), JIN Jun-ze(金俊泽) State Key Laboratory...: In order to study the effect of the stirring flow on the grain diameter and solute concentration of hollow billet, the couple model of the two-phase solidification and electromagnetic field was built......
; Abstract: Fundamental investigations on precision forging technology of magnesium alloys were studied. As-cast billet prestraining and a new concept of hollow billet were proposed in order... conditions. The forming load is related to contact area and average positive stress on interface during forging process. Key words: Mg alloy; precision forging; as-cast billet prestraining; hollow......
; 文献标识码: A Effect of electromagnetic field on surface quality, macrostructure and property of horizontal continuous casting of copper hollow billet LI Xin-tao1, LI... of copper hollow billet prepared by horizontal continuous casting method was investigated. The results indicate that high quality copper hollow billet can be obtained by the application of electromagnetic......
of energy will be caused in the later producing procedures [1-3]. The billet piercing process is the first procedure of the figuration of seamless tubes, and the quality of tube hollow after piercing... hollow quality. In the practical producing process, the billet piercing process can be mainly divided into three stages: the first unsteady piercing stage, the steady piercing stage and the second......
continuous cast one, the electromagnetic cast has obviously improved billet quality. Key words: electromagnetic continuous casting; hollow billet; heat transfer coefficient 目前精密铜管被广泛...;Experimental apparatus for casting hollow billet 外结晶器的内径为60mm, 为了减小铝制外结晶器的电磁屏蔽作用, 在外结晶器的外壁沿轴向自上向下开设了8条宽度为3mm, 长度为80mm的等宽窄缝. 内结晶器的外径为30mm, 有1°~2°的倒锥度. 采用循环冷却水对内, 外结晶器进行冷却. 内结晶器的冷却系统如图2所示. 通过调整热顶中感......
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Electrolyte transfer separation of hollow fiber composite nanofiltration membrane LIU Jiu-qing(刘久清) School of Metallurgy Science and Engineering, Central South University, Changsha 410083... and prediction data using the three parameters mentioned above was obtained. A theoretical model was developed to predict the transport performance of electrolyte through the hollow fiber composite NF......
extrusion of a typical aluminum hollow profile with large cross section as an example, the effects of billet temperature and extrusion speed on the maximum temperature of profile near the die exit...分类号:TG379 文献标志码:A Numerical simulation of temperature field during whole extrusion process of aluminum hollow......
Preparation and thixoforging of semisolid billet of AZ80 magnesium alloy JIANG Ju-fu(姜巨福)1, 2, WANG Ying(王 迎)3, 4, QU Jian-jun(曲建俊)2, DU Zhi-ming(杜之明)1, LUO Shou-jing(罗守靖)1 1. School... May 2010; accepted 25 June 2010 Abstract: Semisolid billet of AZ80 magnesium alloy was prepared by new strain induced melt activated (new SIMA) process and thixoforging experiment was performed......
for both the external and internal alloy melt layers. These modifications are beneficial for the formation of a bimetal interface and fine and uniform grain structure of the clad composite hollow billet. Experiments conducted using the same electrical and casting parameters as the simulations verify that under the electromagnetic field the microstructure of the clad composite hollow billet becomes fine......
