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20 February 2017 Abstract: During multi-pass conventional spinning, roller paths combined with the forward and the backward pass are usually used to improve the material formability. In order... reveals stress and strain features of backward pass spinning. According to the findings, the application of the backward pass can obviously improve the uniformity of wall thickness. Furthermore......
加拿大Selwyn盆地Howards Pass地区铅锌矿床王峰云南驰宏锌锗股份有限公司摘 要:Selwyn盆地Howards Pass铅锌矿床是世界上著名的巨型喷流沉积型(SEDEX)矿床之一,其矿石矿物主要为闪锌矿和方铅矿,呈层状产于下志留统路德河群黑色页岩中.Sm-Nd同位素,稀土元素组成特征表明,路德河群页岩可能为元古宙岩石,Earn群可能来自育空-塔那那地体;锶同位素组成特征反映成矿流体具海水锶和热液锶的混合的特征,以热液锶为主.金属硫化物铅同位素亦证实成矿流体有两种来源.基于该矿床的地质-地球化学特征,SEDEX矿床的形成有两种模式.关键词:SEDEX铅锌矿床;Sm-Nd-Sr同位素;Howards Pass铅锌矿田;Selwyn盆地;......
PVP对PASS分离膜结构与性能的影响刘佳1,王孝军2,杨杰2,31. 四川大学高分子科学与工程学院2. 四川大学分析测试中心3. 四川大学高分子材料工程国家重点实验室摘 要:作为膜材料,聚芳硫醚砜(PASS)具有耐高温耐溶剂等优点,但亲水性不强限制其应用.通过添加亲水性聚合物聚乙烯吡咯烷酮(PVP)改善其亲水性,并采用光学接触角测量仪,扫描电子显微镜(SEM),超滤杯,紫外分光光度计等表征不同PVP含量时分离膜的接触角,形貌,水通量及截留率等.结果表明,PVP可明显改善其亲水性和水通量,截留率影响不大,也在一定程度上改变分离膜的结构形貌;PVP含量为15%时分离膜综合性能最好.关键词:聚乙烯基吡咯烷酮(PVP);聚芳硫醚砜(PASS);分离膜;亲水性;......
Backward tracing simulation of precision forging process for blade based on 3D FEM GAO Tao(高 涛)1, YANG He(杨 合)1, LIU Yu-li(刘郁丽)1, 2 1. College of Materials Science and Engineering... be obtained from a given final shape by using backward tracing scheme based on FEM. The key technologies of backward tracing scheme based on 3D rigid-viscoplastic FEM were explored, and some valid algorithms......
NMR法表征PASS及PASS/NMP溶液结晶过程王孝军1,2,贾向明1,2,王波3,候康3,杨杰1,2,李光宪31. 四川大学分析测试中心材料科学技术研究所2. 四川大学高分子科学与工程学院,高分子材料工程国家重点实验室3. 四川大学高分子科学与工程学院高分子材料工程国家重点实验室摘 要:用1H-NMR和13C-NMR核磁共振技术研究了聚芳硫醚砜(PASS)的结构,并通过13C-1H异核相关谱提供的信息确定了其1H谱和13C谱中各谱峰的归属,为聚合物的表征提供了依据.并通过1H-NMR对比了PASS与N-甲基吡咯烷酮(NMP)溶液结晶过程前后的结构变化.关键词:核磁共振;聚芳硫醚砜;结晶溶剂化物;......
Trans. Nonferrous Met. Soc. China 20(2010) s906-s910 Rheological behavior, microstructure and hardness of A356 aluminum alloy in semisolid state using backward extrusion process S... alloy in the semi-solid state was investigated using backward extrusion process. Experiments were performed at 5 temperatures and 4 different wall thicknesses. Viscosities were determined using the force......
An adaptive algorithm for pass adaptation in plate rollingZhichun Mu, WeimingLi, and Ke LiuInformation Engineering School, University of Science and Technology Beijing, Beijing 100083, China摘 要:<正>A new algorithm for pass adaptation in plate rolling is developed to improve thickness accuracy of plate products. The feature of the algorithm......
Inhomogeneity of density and mechanical properties of A357 aluminum alloy backward extruded in semi-solid state DU Zhi-ming1, 2, CHEN Gang1, CHENG Yuan-sheng1, XIE Shui-sheng2 1. School... state were investigated. Numerical simulation and backward extrusion were adopted to study the preparation of cup shells. The results show that the relative density of the wall is the lowest in samples......
; 文献标识码:A Pass parameter optimization and numerical simulation for tandem rolling process of aluminum tube YU Hui, DU Feng-shan, XU Zhi-qiang, XU Hai-liang (College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China) Abstract: In order to investigate the influence of the pass parameters on the tandem rolling process of aluminum tube, a numerical......
Effect of ECAP Pass Number on Mechanical Properties of2Al2 Al Alloy毕见强摘 要:<正>2Al2 Al alloy was suffered from equal-channel angular pressing(ECAP)in this experiment. The influence of ECAP pass number on ultimate strength(UTS),hardness and elongation was studied.The results show that during ECAP the number of sample passing through the channels......
