The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

SLD模具钢

正高耐磨性冷作模具钢,淬透性佳,热处理变形小,宜制作重负荷冷冲压模或热作修整模,易于加工。易于车削,并宜制造锋利刀口,剪刀,圆锯,五金冲压模具,成型轧辊,滚筒边,螺丝纹,线模,铣刀,冲啷模,圆型滚筒,电力变压器心冲模,切割钢皮轧刀,钢管成型滚筒,特殊成型滚筒,精密规,形状繁杂之冷压工具,冶金,锡     

RE-X二元合金相图的热力学数据库

利用CALPHAD方法,采用亚正规溶体模型、亚点阵模型以及理想气体模型来描述RE-X(Ag,Bi,Cr,Mn,Mo,V,Zn)中二元系各相的Gibbs自由能,并结合相平衡及热力学性质的实验结果,对Ag-RE(RE:Sc,Y Nd,Sm,Gd,.Tb,Ho,Er)、Bi-RE(RE:Nd,Tm,Er,Ho,Pr,Gd)、...     

Al-Cr-Mn体系的热力学模拟

为了建立Ti-Al-Cr-Mn系的热力学数据库,对该四元系中子三元系Al-Cr-Mn体系的富Al角作了热力学评估.对于该三元系中的化学计量比化合物,如Al<,6>Mn和Al<,12>Mn等采用模型Al<,m>(Cr,Mn)<,n>,θ Al<,7>Cr、η_Al<,11>Cr2及μ_Al<,4>(Cr,Mn)相选用点阵模型Al<,m>(Al,Cr,Mn)<,n>,T_HTAl<,11>Mn<,4>及γ2_aAl<,8>(Cr,Mn)<,5>相的点阵模型分别处理为(Al,Mn)<,29>(Cr,Mn)<,10>和(Al,Cr)<,12>(Al,Cr,Mn)<,5>(Al,Cr,Mn)<,9>.并对该系进行一系列热力学优化及相图计算并与相应的实验结果作了比较,发现计算结果与大部分实验结果基本吻合,但在1 283 K等温面中,Al<,8>(Cr,Mn)<,5>化合物只存在一个γ2_aAl<,8>(Cr,Mn)<,5>结构,而实验相图中还存在γ1 βAl<,8>(Cr,Mn)<,5>结构.分析Al-Mn体系认为,γ1_βAl<,8>(Cr,Mn)<,5>在1 283 K时不会稳定存在,且1173 K等温面中出现η_Al<,11>Cr2相,而实验相图中不存在该相.通过对Al-Cr系调研可以发现,η_Al<,11>Cr2相在温度下降到1204 K时通过L+Al<,4>Cr→Al<,11>Cr2生成,因此,在外推Al-Cr-Mn三元系时,η Al<,11>Cr2相在1173 K时会稳定存在.     

Numerical simulation and optimization of clearance in sheet shearing process

1　INTRODUCTIONThesheetmetalshearingprocessisverycompli catedduetoitsdeformationandfracture .Duringtheprocess,thefiercedeformationandlimitstrainaremuchgreaterbeforefracturethananyotherprocess .So ,uptillnow ,theintricateappearancesduringtheshearingprocesscannotbeexplainedproperly .Withregardtodeformation ,shearingprocessismorecomplicatedthanotherformingprocessessuchasdeepdrawing ,bending ,bulging ,andburring .Inanalysisofformingprocesses ,thepredictionandeval uationofstress ,strain ,veloc…     

Cleavage nature,electrokinetics,aggregation and dispersion of kaolinite

1　INTRODUCTIONKaoliniteiscurrentlyusedinceramics ,papermanufacturing ,medicalapplications ,agriculturalchemicals ,chemicalengineering ,refractorymaterialanddefenseindustrybecausekaolinitehasmanyhighprocessingpropertiesasanindustrialmineralduetoitssurfaceproperties[1,2 ] .Inreverseflotationofdi asporicbauxite ,whichisveryimportantforthein dustryofaluminumoxideproduction ,kaoliniteisneededtoberemoved .Therefore ,Itisusefultoun derstandthecrystalstructure ,cleavagenature ,sur faceelectrokin…     

光谱法测定钛及钛合金中的微量杂质元素

采用发射光谱分析技术,研究了钛及钛合金中Zr,Ru,Pd,Hf,Cu,Y,V,Mo,Nb,Al,Co,Ni,Ta,Bi,Sn,Cr,Mn的光谱测定方法。结果表明,选用碳粉作为缓冲剂,使用浅孔电极和大电流激发,一次摄谱可同时测定17个杂质元素。测定下限为3×10-4%～15×10-3%,相对偏差在15%以内。     

NUMERICAL SIMULATION OF FORGING AND SUBSEQUENT HEAT TREATMENT OF A ROD BY A FINITE VOLUME METHOD

1.air-nonAtypicalindustrialmetalcoml,onentwouldoftenbemadeviatheforgingandheattreatm',ntoperationsintilenlarlufacturingstage.IntiledesignOfforgingprocesses,informationisllecesstllysuchasmaterialflowinthedies,levelofdiefill,del'ects,strain,stress,temperaturedistributioninthebarkpiecesaxltlthedies,andforgingforce.InthesubseqUentheattreatmentoperations,illf(,mlationoncolllbinationOfrnicrostructure,residualstressesanddiTocnsionalaccuracyintilel'illalproductalealsoveryimportant.Suchinformationmay…     

无苯去漆剂的研制

介绍了无苯去漆剂的配方,性能及其去除各类漆膜的实际应用效果,无苯去漆剂克服了含苯及其衍生物为原料的去漆剂毒性大,挥发性强,选择性强,适用范围窄,退漆速度慢等缺点,可用于硝基,氨基,过氯乙烯基,酚醛树脂,环氧树脂,聚氨脂,沥青,醇酸,丙烯酸等多种漆膜,适用于碳钢,不锈钢,铜,铝及木质家具等多种材料表面漆膜的去除,具有水冲洗方便,使用安全可靠,效果显著等优点。     

钛合金化学分析标准试样的研制

报导了TC1,TC4,TC6,TC10,TC11 5种牌号钛合金化学分析标准试样的研制工艺。标样包括的成份有Al,V,Mo,Zr,Si,Fe,Cu,Mn,Sn,Cr 10种合金成份和Fe,Si,C,N 4种杂质成份。     

Titanium Dioxide Coatings Sprayed by a Water-Stabilized Plasma Gun (WSP) with Argon and Nitrogen as the Powder Feeding Gas: Differences in Structural, Mechanical and Photocatalytic Behavior

Titanium dioxide coatings were sprayed by a water-stabilized plasma gun to form robust self-supporting bodies with a photocatalytically active surface. Agglomerated nanometric powder was used as a feedstock. In one case argon was used as a powder-feeding as well as coating-cooling gas whereas in the other case nitrogen was used. Stainless steel was used as a substrate and the coatings were released after the cooling. Over one millimeter thick self-supporting bodies were studied by XRD, HR-TEM, XPS, Raman spectroscopy, UV-VIS spectrophotometry and photocatalytic tests. Selected tests were done at the surface as well as at the bottom side representing the contact surface with the substrate during the spray process. Porosity was studied by image analysis on polished cross sections where also microhardness was measured. The dominant phase present in the sprayed samples was rutile, whereas anatase was only a minor component. The hydrogen content in the nitrogen-assisted coating was higher, but the character of the optical absorption edge remained the same for both samples. Photoelectron spectroscopy revealed differences in the character of the O1s peak between both samples. The photocatalytic activity was tested by decomposition of acetone at UV illumination, whereas also the end products??CO and CO₂??were monitored. The nitrogen-assisted coating was revealed as a more efficient photocatalyst. Certain aspects of a thermal post-treatment on the coatings are discussed as well. Color and electrical conductivity are markedly changed at annealing at 760?°C, whereas only very small changes of the as-sprayed coating character correspond to annealing at 500?°C.     

复合变质对低铬白口铸铁的作用

采用Re-Al-Bi—Mg对低铬白口铸铁进行复合变质。在炉内、炉外实行“二步法”处理并按变质合金异质形核的生核能大小设计分级处理的顺序,起到了控制碳化物的析出量和改善析出形态、净化铁液、净化晶界、细化晶粒等良好的变质效果。这些变化主要是复合变质所产生的动力学效应对其影响的结果。这种变质作用受制于复合变质在冶金处理过程中所应具备的相关的动力学条件。     

球墨铸铁的球化与孕育处理工艺

综述了球墨铸铁各种化学元素的作用和成分的控制范围,详细介绍了球墨铸铁的球化与孕育处理工艺。分析了单加纯Mg或RE合金作为球化剂的缺点,说明球化剂应以Mg为主、以RE为辅的原因;对冲入法、盖包法、喂丝法等球化处理工艺的优缺点进行了比较。指出了孕育处理对球墨铸铁生产的重要性,列举了球墨铸铁常用孕育剂的成分范围,并介绍了炉前一次孕育和多次孕育、瞬时孕育、随流孕育的特点。     

Nb强化铸铁机理的基础研究

介绍了Nb在铸铁中的应用现状,对富铌相在铸铁中的存在形式和形成条件进行了热力学分析。通过NbC和铸铁组织中的γ-Fe和石墨的晶格点阵的二维错配度计算,证实了NbC可以成为石墨异质晶核的衬底。提出了进一步研究Nb元素对铸铁作用机理的方向。     

T91钢表面复合电沉积Ni/CrAl镀层的工艺研究

采用复合电沉积法在T91钢表面制备Ni/CrAl镀层,研究了CrAl微粒在镀层中的含量与搅拌强度、镀液pH值、电流密度及温度的关系,确定最佳工艺参数为:电流密度2.5～4.5A/dm2,pH值4～4.5,温度30℃。采用该工艺制备了较高CrAl含量的复合镀层,并对工艺参数影响复合电沉积的机理进行了简单探讨。     

我国热处理能源结构分析

通过对我国能源构成的介绍,分析了我国热处理能源结构的现状,指出,对于热处理行业,能源是基础,节能是关键,环保是焦点,质量是根本,技术是保证。介绍了几种热处理工艺和设备的节能减排新技术。     

Forming of seamless pipe fittings

Analysis and results of the high temperature forming of seamless pipe fittings produced at a local factory are presented in this work. The studies were conducted by recording the thermal evolution in different parts of the piece as it was being forged, which was done by placing a series of type K thermocouples within the part and logging the data into a computer driven system. The initial trials put in evidence the need to change the heating practice in order to ensure a greater thermal homogeneity. Metallographic evaluation was carried out on formed pieces to study variations in their microstructure before and after the changes in the heating practice were made. Modification of this practice resulted in improvements in quality, such as the reduction in the variation in microstructure and wall thickness, as well as an increase in productivity, as the pressing speed was augmented.     

THERMODYNAMICS OF Mn-C-j MELTS AT 1350℃

The solubility of C in Mn melt at different contents of Si at 1350℃ was determined.The sol-ubility of Ca in Mn melts containing C in CaC_2 crucible under sealed condition at 1350℃was ascertained.With these data,evaluation of the activity interaction coefficients e_C~(Si),e_C~C,e_C~(Ca) as well as γ_C~0 was made.The standard free energy of solution of C in liquid Mn basedon the 1 wt-% solution standard,formulated in relation to T,was also estimated.Brief dis-cussion was made as to the confiormability of results with those given in the literature.     

基于遗传算法的矿用液压正铲挖掘机优化设计

以液压正铲挖掘机的工作装置为研究对象,通过D-H法对挖掘机工作装置进行分析建模,对斗容为36 m~3某型号正铲挖掘机正铲工作装置进行优化设计,详细论述了目标函数的确定、设计变量的确定和约束条件的确定方法,得到了优化后正铲挖掘机的位置解以及铲斗轨迹、挖掘包络图和平铲过程中角度和平铲距离的对比图像,并对其进行了分析和比较,验证了优化设计的合理性。     

Co-Deposition of Sulphur from Acid Copper Solution Containing Thiourea

The co-deposition rate of thiourea, as far as sulphur is concerned, was measured on a rotating disc electrode in acid copper solution containing thiourea labelled with sulphur-35. For freshly made solutions at room temperature at higher current densities the co-deposition rate was controlled by diffusion, while mixed control of the co-deposition rate was found at lower current densities. In aged solutions as well as at higher temperatures the co-deposition rate decreased considerably and diffusion control was found to cease.