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, the temperature distribution in the cross section is uniform. Especially, the temperature of the C-shape notch with a larger thickness is lower than that of other regions in the cross section, which...FEM analysis of metal flowing behaviors in porthole die extrusion based on the mesh reconstruction technology of the welding processDong-nan Huang1,2), Zhi-hao Zhang1), Jing-yuan Li1), and Jian-xin......
形过程不连续[7],导致挤压效率低下,无法适应大规模工业化生产.此外,单道次ECAE变形后,坯料变形均匀性不高,横截面上常出现应变层化现象[8],且制备材料有效尺寸十分有限,使得该工艺进一步的发展和应用受到了限制. 因此,本文将"球形分流"的思想[9]引入传统ECAE工艺,提出一种新型复合剧烈塑性变形技术 -- 等通道球形转角挤压(Equal channel angular extrusion...-SC变形后坯料中心横截面上的等效应变分布 Fig. 5 Effective strain distributions through transverse direction (cross-section) of billet processed by ECAE-SC 2.4 平均应力分析 图6所示为ECAE-SC稳定变形阶段坯料中心纵截面的平均应力分布云图.由图6可知......
Trans. Nonferrous Met. Soc. China 20(2010) s729-s733 Fabrication of AZ31 alloy wire by continuous semisolid extrusion process GUAN Ren-guo(管仁国), ZHAO Zhan-yong(赵占勇), SUN Xiao-ping(孙小平... June 2010 Abstract: A novel technology of continuous semisolid extrusion Process (CSEP) was adopted to produce AZ31 alloy structural materials. Effects of technological conditions......
into massive material billet without changing its cross-section during the multi-pass shearing deformation through a special die[11]. ECAP is capable of refining bulk materials with coarse grain..., MOLINARI A. Deformation field variations in equal channel angular extrusion due to back pressure [J]. Scripta Mater, 2008, 58: 771-774. [15] TORRE F D, LAPOVOK R, SANDLIN J, THOMSON P F, DAVIES C H......
for the diverse conditions to design proper dies. 2) Uniform material flow velocity in the cross section of the bearing exit in porthole die extrusion process is extremely important for improving quality.... Porthole die extrusion has significant advantage in the forming process, which can produce the hollow section product that is difficult to be produced by conventional extrusion with a mandrel on the stem......
Materials Processing Technology, 2001, 113: 93-97. [8] WILLIAMS A J, CROFT T N, CROSS M. Computational modelling of metal extrusion and forging process [J]. J Materials Processing Technology, 2002... Structure optimization of porthole die based on aluminum profile extrusion process numerical simulation WU Xiang-hong(吴向红)1, ZHAO Guo-qun(赵国群)1, LUAN Yi-guo(栾贻国)1, LOU Shu-mei(娄淑梅)1, MA Xin-wu(马......
-uniform shear deformation process in the cross-section of the workpiece. The different processing routes for equal round channel angular pressing process were conducted by using node mapping method in multi...路线 中图分类号:TG 376 文献标识码:A Deformation mechanism of multi-pass equal channel angular extrusion for round-workpieces XU Shu-bo1, ZHANG Guo-liang2, REN Guo-cheng1......
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 and the temperature distribution on cross section were analyzed, and the reasonable billet temperature and extrusion speed were obtained. The results show that, the influence of the extrusion speed......
. In Figure 3, r is the corner radius for square section or radius for circular section. When ρ is equal to 1, the cross section shape is circular, otherwise the cross section shape is square. Based... types, damage levels and cross-section types. First, the load-damaged degree and fire-damaged degree of concrete are defined. Then, applying the Hoek-Brown failure criterion to FRP- confined concrete......
; Abstract: Preparation of semi-solid billet of magnesium alloy and thixoforming was investigated by applying equal channel angular extrusion to magnesium alloy... using semi-solid billet prepared by new SIMA have higher mechanical properties at room temperature and high temperature of 373 K. Key words: magnesium alloy; thixoforming; equal channel angular extrusion......
