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in porthole die extrusion process of aluminum alloy profiles [J]. Journal of Materials processing Technology, 2016, 237: 31-47. [16] JIE Y I, WANG Z H, LIU Z W, ZHANG J M,HE X. FE analysis of extrusion defect and optimization of metal flow in porthole die for complex hollow aluminiumprofile[J]. The Chinese Journal of Nonferrous Metals, 2018, 28: 2094-2101. [17] 黄东男,李静媛,张志豪,谢建新. 方形管分流模双孔挤压过程中金属的流动行......
Effect of RE element Y on properties of Ti(C, N)-based cermetXIANG Hongliang , HU Yaobo , and XIONG Weihao1) The College of Mechanical Engineering, Fuzhou University, Fuzhou 350002, China2) National Key Laboratory of Die & Mould Technology, Huazhong University of Science & Technology, Wuhan 430074, China摘 要:<正> The effect of RE element Y......
富铈混合稀土对压铸AZ71镁合金组织和力学性能的影响 廖慧敏1,龙思远1,易有福1,王瑞斐1 (1.重庆大学材料科学与工程学院,重庆,400044) 摘要:研究了富铈混合稀土MM(质量分数为1%~3%)对AZ71镁合金组织和力学性能的影响.结果表明,富铈混合稀土MM的加入使压铸AZ71镁合金的组织明显细化,β-Mg17Al12相减少,同时,析出条状和针状化合物,沿晶或者穿晶分布.室温和150℃拉伸实验表明,抗拉强度和屈服强度随MM加入量的增加不断提高,室温下的延伸率随之降低,而在150℃时延伸率随稀土量MM的增加先逐步提高后略有降低,在MM的含量为2.5%时达到最大值.同时,富铈混合稀土......
有色金属压铸工艺专家知识的神经网络模拟 罗蓬1,杨屹2 (1.贵州工业大学机械工程系,贵阳,550003;2.四川大学制造科学与工程学院,成都,610065) 摘要:将误差反向传播(BP)神经网络与专家系统知识表示的框架结构相结合,进行有色金属压铸工艺参数映射的神经网络模拟.神经网络学习训练收敛后,得到其各层神经元联接权(含阈值)的分布状态.工艺设计知识则以隐式分布存储于这些联接权分布状态中.神经网络知识的生成是根据其自学习机制,通过工艺知识的编码样本自动进行,且具有自动寻优和自更新功能. 关键词:材料合成与加工工艺; 神经网络; 压铸; 专家系统; 框架; [全文内容正在添加中]......
内螺旋型拉伸模的线切割加工 陈辉煌1,刘赣华2 (1.南方冶金学院材料系,;2.南方冶金学院机械系) 摘要:论述了用线切割加工螺旋角为小角度的内螺旋拉伸模的过程,并通过拉伸试模实验验证,该加工方法是切实可行的. 关键词:拉伸模; 内螺旋沟槽; 线切割加工; [全文内容正在添加中] ......
was applied to the die to improve the fluidity of the feedstock and subsequently the cooling system was used to enhance the strength of the green compacts after injection by decreasing the temperature of the die. The gear wheels were realized successfully with their addendum circle diameter ranging from 800 to 200 μm and with the center hole as small as 60 μm.关键词:......
angles[J]. Nonferrous Metals, 2009, 61(3): 37-40. [15] LI L, ZHANG H, ZHOU J, DUSZCZYK J, LI G Y, ZHONG Z H. Numerical and experimental study on the extrusion through a porthole die to produce a hollow... flow and die regions, the flow velocity differences are smaller than those of other regions. With the increase of wheel velocities, in the rectangular bending and expansion regions, the differences......
Deforming analysis of sheet metal based on stereo vision and coordinate gridHongqin Wei, Dehong Yu, Xueyu Ruan, and Youqing Wang Department of Plasticity Technology, Shanghai Jiaotong University, Shanghai 200030, China Die or Mould and Plasticity Processing Research Institute, Xi’an Jiaotong University, Xi’an 710049, China摘 要:<正> A new approach......
="ChDivSummary">In the stainless steel 304 (SUS 304) wire drawing process, optimizing the die life and wire tensile strength, which are the larger-the-better quality characteristics (QCH) types...-ducted for the normalized signal-to-noise (S/N) ratios. The ordinal value of the grey grade was then used to decide optimal factor levels. The anticipated improvements in die life and wire tensile......
coating was overall worse than W6Mo5Cr4V2,but had a higher hot yield strength to alleviate hot fatigue and surface hot wear of hot forging die during hot forging and thus improve the service life of hot forging die.关键词:......
