共搜索到2195条信息，每页显示10条信息，共220页。用时：0小时0分0秒928毫秒
......
°, the most suitable value of β is about -5° for the AZ31 Mg alloy thin-walled tube profile die. Key words: AZ31 Mg alloy; thin-walled tube; porthole die; porthole axial angle; numerical simulation 基金项目...; AZ31镁合金异型薄壁管分流组合模几何模型如图2所示. 图2 分流组合模具几何模型 Fig. 2 Geometries of porthole dies: (a) Dividing die; (b) Welding die 采用数值模拟与理论分析相结合的方法,通过单一改变分流模分流孔轴向倾角,研究分析分流孔轴向倾角对挤压的影响规律.选取的分流孔轴向倾角β分别为-10......
Trans. Nonferrous Met. Soc. China 31(2021) 1939-1950 Isothermal extrusion speed curve design for porthole die of hollow aluminium profile based on PID algorithm and finite element simulations Jie YI1... is balanced with the heat transfer from the workpiece to the container, porthole die and external environment. Key words: isothermal control; extrusion speed curve; porthole die extrusion; PID control......
) on the microstructure and mechanical properties of 6063 aluminum alloy profile during porthole die extrusion was studied through experiment and simulation. The grain morphology was observed by means... of grain size and increase of extrudate temperature were beneficial to the improvement of microhardness. Key words: 6063 aluminum alloy; porthole die extrusion; dynamic recrystallization......
, HUANG Guo-jie, HE You-feng. Effects of height of welding chamber heights on extrusion forming process of porthole die[J]. Chinese Journal of Rare Metals, 2008, 32(4): 442-446. [10] TANG D, ZHANG Q, LI D... Dong-nan, ZHANG Zhi-hao, LI Jing-yuan, XIE Jian-xin. Influences of welding chamber depth and welding angle on forming quality of extrusion of square tube by porthole die[J]. The Chinese Journal......
Trans. Nonferrous Met. Soc. China 23(2013) 765-772 Oxide distribution and microstructure in welding zones from porthole die extrusion Xin-ming ZHANG1, Di FENG1, Xing-kuan SHI2, Sheng-dan LIU1 1... December 2011; accepted 17 April 2012 Abstract: The oxide distribution and microstructure in longitudinal and transverse welding zones during the billet-to-billet extrusion process through porthole die......
of hollow profile is greatly improved. Key words: Al alloy; hollow profile; porthole die extrusion; metal flow; cross section temperature; inhomogeneity 在挤压成形过程中,由于塑性变形热,摩擦热,金属与工模具之间的传热以及金属内部热传导等原因,导致挤压产品沿长度方..., 23(10): 2769-2778.HOU Wen-rong, ZHANG Zhi-hao, XIE Jian-xin, CHEN Yun-bo. Numerical simulation of temperature field during whole extrusion process of aluminum hollow profile with porthole die......
程中的流动 Fig. 4 Metal flow through the porthole die 2.2 挤压力变化 图5(a)所示为挤压速度为7 mm/s时有限元模拟和实验过程中挤压力随着挤压垫位移的变化.从图5(a)中二者对比结果可以看出,有限元模拟峰值比挤压试验所测值高出2.5%左右,这可能是由于在有限元模拟过程中忽略了坯料和挤压工具弹性变形以及过高地评估坯料与挤压工... extrusion by a porthole die[J]. Journal of Materials Processing Technology, 2006, 173(2): 223-231. [9] YU J Q, ZHAO G Q, ZHANG C S, CHEN L. Dynamic evolution of grain structure and micro-text along......
.ysxb.1004.0609.2021-39670 LIU Zhi-wen, LI Luo-xing, FU Chun-ming, et al. Defects formation mechanism and precision control of exit flow velocity in porthole die extrusion of hollow thin-walled aluminum profile[J... Fig. 1 Cross-section shape of hollow profile(a) and initial design scheme of extrusion porthole die(b) (Unit: mm) 图2 型材挤压试模典型缺陷 Fig. 2 Typical defects of profile in extrusion tests......
channel angular processing (ECAP) and porthole die extrusion techniques, a novel technique, namely portholes-equal channel angular processing (P-ECAP), was studied. Extrusion of AL6005A plate used...: subsize billet; porthole die; equal channel angular processing (ECAP); extrusion 1 Introduction Rolling is a traditional large-scale plate production technique; however, there are a number of steps involved......
