2010上海国际铸件产品专业展

<正>组织单位:天津市铸造学会、上海市铸造学会、江苏省铸造学会、湖南省铸造学会、北京市铸造学会,浙江省铸造学会、江西省铸造学会、河南省铸造学会、山西省铸造学会、大连市铸造学会、安徽省铸造学会、河北省铸造学会、福建省铸造学会,邯郸市铸造学会     

"绿色铸造"与铸造行业环保

绿色铸造成为铸造行业环保设计的指挥棒,灌输绿色铸造理念对促进铸造行业环保具有重要意义。在分析国内外铸造行业环保现状的基础上,结合我国铸造生产技术水平与存在的主要问题,提出编制铸造行业的绿色制造标准,从铸造工艺、造型材料和铸造装备等多方面入手促进铸造环保,利用计算机模拟与信息化技术全面提升铸造技术水平,开发废气物的资源化处理新技术与加强铸造环保科技人才的培养,是实现绿色铸造的有效途径。     

中国铸造新技术发展趋势

在评介工业发达国家铸造技术发展现状和中国大陆铸造技术发展现状的基础上,从铸造合金材料、铸造原辅材料、铸造合金熔炼、砂型铸造、特种铸造、铸件质量保障和铸造信息化七个方面概括描述了近期可以看到的中国大陆铸造技术的发展趋势.     

首届西部消失模铸造技术与生产管理培训班

为进一步推广和提升消失模铸造技术,由四川省铸造协会、成都市铸造协会主办,重庆市铸造协会、广西铸造学会、内蒙古铸造学会、云南省铸造学会、新疆铸造学会、陕西省铸造学会协办,成都卡斯汀贸易公司承办的“首届西部消失模铸造技术与生产管理培训班”将于2014年7月在四川省成都市崇州市举办。     

关于举办铸造自动化装备应用培训班的通知

各铸造行业相关单位： 目前，铸造行业的转型升级十分迫切。铸造装备自动化、绿色铸造、低碳铸造将成为铸造行业未来发展的必然趋势。铸造装备自动化水平也是衡量一国铸造竞争力的核心因素之一。为此，为满足广大铸造企业对铸造自动化装备的迫切应用需求，提高铸造自动化装备从业人员的应用水平与操作技能，由中国机械工程学会铸造分会继续教育培训中心、中国机械工程学会铸造分会铸造装备技术委员会、万丰奥特控股集团、上海ABB工程有限公司联合主办的“铸造自动化装备应用培训班”，将于2010年10月中旬正式开班。     

第十二届全国铸造年会暨2011中国铸造活动周征文通知

会议主题:先进铸造技术与铸造业的可持续发展主办单位:中国机械工程学会及其铸造分会承办单位:中国机械工程学会铸造分会铸造行业生产力促进中心支持媒体:《铸造》《特种铸造及有色合金》《现代铸铁》《中国铸造装备与技术》《铸造技术》《铸造工程》《铸造设备与工艺》     

《特种铸造及有色合金》杂志征订启事

《特种铸造及有色合金》杂志,是中国科学技术协会主管,中国机械工程学会主办的全国性期刊,为国内外权威数据库及检索系统收录,并获得全国优秀科技期刊一等奖、国家期刊奖和新中国60年有影响力的期刊。本刊主要报道各种(黑色和有色合金)特种铸造方法,如:熔模铸造,压铸,低压铸造,挤压铸造,差压铸造,半固态铸造、金属型铸造,离心铸造,连续铸造,壳型铸造,消失模铸造(实型铸造)及电磁铸造等方面的理论、工艺、设备、造型材料、测试与控制、计算机应用技术等;各种(砂型铸造及特种铸造)     

2012中国铸造活动周会议及展示会通知

主办单位：中国机械工程学会 承办单位：中国机械工程学会铸造分会、铸造行业生产力促进中心 协办单位：江苏省铸造学会、江苏省铸造协会、苏州市铸造学会、无锡市铸造学会、无锡市铸造协会、常州市铸造协会     

第十二届全国铸造年会暨2011中国铸造活动周征文通知

会议主题:先进铸造技术与铸造业的可持续发展主办单位:中国机械工程学会及其铸造分会承办单位:中国机械工程学会铸造分会铸造行业生产力促进中心支持媒体:《铸造》《特种铸造及有色合金》《现代铸铁》《中国铸造装备与技术》《铸造技术》《铸造工程》《铸造设备与工艺》《CHINA FOUNDRY))支持单位:圣泉集团股份有限公司苏州市兴业铸造材料有限公司福士科铸造材料(中国)有限公司永冠能源科技集团第12届全国铸造年会暨2011中国铸造活动周将于2011年11月13-17日在广州举行,第11届亚洲铸造会议将同时同地举办。     

《特种铸造及有色合金》杂志征订启事

《特种铸造及有色合金》杂志是中国科学技术协会主管,中国机械工程学会主办的全国性期刊,为国内外权威数据库及检索系统收录,并获得全国优秀科技期刊一等奖、国家期刊奖和新中国60年有影响力的期刊。本刊主要报道各种(黑色和有色合金)特种铸造方法,如:熔模铸造,压铸,低压铸造,挤压铸造,差压铸造,半固态铸造、金属型铸造,离心铸造,连续铸造,壳型铸造,消失模铸造(实型铸造)及电磁铸造等方面的理论、工艺、设备、造型材料、测试与控制、计算机应用技术等;各种(砂型铸造及特种铸造)有色合金及复合材料的熔炼和铸造工艺、凝固理论、测试与控制、计算机应用等方面的科研成果及生产经验,并介绍上述内容的国     

The effect of casting temperature on the properties of squeeze cast aluminium and zinc alloys

Gravity casting and squeeze casting were carried out on an aluminium alloy with 13.5% silicon and a zinc alloy with 4.6% aluminium with different temperatures, 660, 690 and 720 °C for the former and 440, 460 and 480 °C for the latter. A top-loading crucible furnace was used to melt the alloys. The die-preheat temperatures used were 200–220 °C for the aluminium alloy and 150–165 °C for the zinc alloy. A K-type thermocouples with digital indicator were used to measure the die surface temperature and the molten metal temperature; while a 25 t hydraulic press with a die-set containing a steel mould was used to perform the squeeze casting with a pressure of 62 MPa. Tensile, impact and density tests were carried out on the specimens. It was found that casting temperature had an effect on the mechanical properties of both gravity cast and squeeze cast aluminium and zinc alloys. The best temperatures to gravity cast the aluminium alloy and the zinc alloy were 720 and 460 °C, respectively. For the squeeze casting of the aluminium alloy, the best temperature to use was either 690 or 660 °C; the former would give a better property at the top of the casting while the latter, at the bottom of the casting. However, for the squeeze casting of the zinc alloy, the best temperature was again 460 °C.     

Investment casting of AZ91HP magnesium alloy

This paper describes AZ91HP magnesium alloy investment casting. The aim of this study is to optimize the process for magnesium investment casting. Special attention was given to evaluating the thermal stability of oxides against molten AZ91HP magnesium alloy. The oxides examined included CaO, CaZr0₃, and silica bonded A1₂0₃ and ZrSi0₄. Also, the microstructural features of the as-cast alloy were investigated, and the effect of the processing parameters on the microstructure and mechanical properties were evaluated describing the grain size, hardness and ultimate tensile strength of the as-cast alloy.     

Liquid forging of thin Al–Si structures

Liquid forging is a pressurized solidification process, wherein finished components can be produced in a single process from molten metal to solid, utilizing re-useable die tools. In conventional die casting (gravity and pressure), components with a minimum wall thickness of about 0.6 mm can be fabricated. However, parts with section thickness as thin as 0.2 mm can be liquid forged using near eutectic Al–Si or Al–Si–Cu alloys. Water based lubricant containing micrographite is effective in releasing the component during ejection. In addition, it aids in shaping the component to required dimensional accuracy. These liquid forged parts are pore free. Thermal analysis of liquid forged 0.8 mm plate revealed rapid freezing at the rate of about 700 °C/s. During the process, die and punch were maintained at 200–250 °C. X-ray residual stress analysis on the surface of the liquid forged plate showed high intensity values for 0.1 mm plate. Distribution of eutectic silicon at inter dendritic region is extremely fine to nanoscale level.     

The production of high-density hollow cast-iron bars by vertically continuous casting

Hollow cast-iron bars with an outer diameter of 60-300 mm, a wall thickness of 7-40 mm and a length of 10 m or longer were produced massively by vertically continuous casting. The whole casting processes were analogous to the casting processes of solid bars by horizontal continuous casting. The metallographic microstructure, the distribution of chemical composition along their radius direction and the mechanical properties of the hollow bars were investigated. The results show that the hollow cast-iron bars are compact and few shrinkage cavities and shrinkage porosities exist in them. Their graphite grains or their eutectic colonies are very fine and their mechanical properties are superior to that of bars produced by sand casting. Their chemical composition is distributed uniformly along their radius direction and no segregation was observed.     

ANALYSIS OF OVERFLOW CRITICAL VALUE FOR TiAl BASED ALLOY MELT DURING PROCESS OF CENTRIFUGAL CASTING

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球墨铸铁件缺陷诊断的神经网络模型

针对球铁缺陷分析的实际问题，对球铁典型的５种缺陷产生的影响因素进行了归纳总结。依据球铁生产过程中的工艺参数，采用神经元网络的方法，建立了球墨铸铁件缺陷分析的神经网络模型。借助Ｐｏｗｅｒ Ｂｕｉｌｄｅｒ ６．０平台开发出了相应的应用软件，该软件可根据生产的工艺条件来预测缺陷的产生并提出防止措施，从而可有效地提高铸件的成品率。同时，也为其它类铸件缺陷的分析提供了可以借鉴的方法。     

Microstructural evolution of twin-roll cast Mg–3Al–0.5Mn–0.2Mm alloys during warm rolling and subsequent annealing

Microstructure of twin-roll casted (TRC) Mg–3Al–0.5Mn–0.2Mm (or AM30 + 0.2Mm) alloy strips consisted of columnar dendrites in the surface and equiaxed dendrites in the center regions, as well as widely dispersed fine primary intermetallic compounds located in the interdendritic region. Warm rolling of the TRC strips developed both deformation or shear bands and homogeneously dispersed fine particles. No evident dynamic recrystallization (DRX) was found in the TRC sheets during warm rolling. The dispersed fine particles seemed to retard DRX. The warm-rolled TRC sheets showed equiaxed fine grains with an average size of around 8 μm after annealing at 350 °C for 60 min. The TRC sheets had superior yield and tensile strengths to ingot cast (IC) samples. Elongation was similar to both TRC and IC samples.     

Determination of heat transfer coefficient and ceramic mold material parameters for alloy IN738LC investment castings

Investment casting molds with different numbers of shells and pre-heating temperatures were investigated in this study. The primary layer consists of colloidal silica bound ZrSiO₄ with additions of CoAl₂O₄ to achieve fine grains and to reach a good surface quality, whereas the following layers consist of mullite bound by colloidal silica. Interface temperatures (alloy/mold) that are necessary to determine heat transfer coefficients were obtained by linear extrapolation. Heat transfer coefficients in the range of 300-660 W/(m² K) were obtained. The castings were examined with regard to grain size and secondary dendrite arm spacing. Physical properties of the investment casting mold were examined by differential scanning calorimetry (DSC) and Laserflash methods for temperatures up to 1300 °C. The specific heat capacity was determined to 1.13 J/(g K), thermal diffusivity was found to be in the range of (4-5) × 10⁻⁷ m²/s and the thermal conductivity to be 1 ± 0.1 W/(m K).     

Microstructure and mechanical properties of Mg-Al-Mn-Ca alloy sheet produced by twin roll casting and sequential warm rolling

Microstructural evolution and mechanical properties of twin roll cast (TRC) Mg-3.3 wt.%Al-0.8 wt.%Mn-0.2 wt.%Ca (AM31 + 0.2Ca) alloy strip during warm rolling and subsequent annealing were investigated in this paper. The as-TRC alloy strip shows columnar dendrites in surface and equiaxed dendrites in center regions, as well as finely dispersed primary Al₈Mn₅ particles on interdendritic boundaries which result in the beneficial effect on microstructural refinement of strip casting. The warm rolled sheets show intensively deformed band or shear band structures, as well as finely and homogeneously dispersed Al-Mn particles. No evident dynamic recrystallization (DRX) takes place during warm rolling process, which is more likely attributed to the finely dispersed particle and high solid solution of Al and Mn atoms in α-Mg matrix. After annealing at 350 °C for 1 h, the warm rolled TRC sheets show fine equiaxed grains around 7.8 μm in average size. It has been shown that the present TRC alloy sheet has superior tensile strength and comparative elongation compared to commercial ingot cast (IC) one, suggesting the possibility of the development of wrought magnesium alloy sheets by twin roll strip casting processing. The microstructural evolution during warm rolling and subsequent annealing as well as the resulting tensile properties were analyzed and discussed.     

A comparison of the colloidal stabilization of aqueous titanium carbide suspensions using anionic and cationic dispersants

The aqueous colloidal stability of titanium carbide (TiC) suspensions has been assessed using both anionic and cationic dispersants. The zeta potential of TiC suspensions, both without and with polyelectrolyte addition, is examined as a function of pH and the relative responses of the polyelectrolytes are compared. Without a dispersant, the TiC powder used shows an isoelectric point at ~ pH 2.6. The use of an anionic polyelectrolyte, an ammonium salt of polymethacrylate (PMA-NH₄) does not significantly alter the isoelectric point. Conversely, the addition of a cationic dispersant, polyethylenimine (PEI) with a molecular weight of either 1800 or 10,000, significantly alters the isoelectric point. The rheological behaviour of the TiC suspensions was examined using a concentric cylinder geometry. In each case a shear thinning response is observed, and a transition to shear thickening is seen on all the PMA-NH₄ trials, and some, but not all, of the PEI experiments at high shear rates (~ 600 s^− 1). The PMA-NH₄ was found to produce optimum slip stability at lower concentrations, (~ 0.02 wt.%) versus the PEI, which obtained the same slip stability at concentrations of ~ 0.30 wt.%. However, increasing the PMA-NH₄ concentration does not provide increased stability; above this point it begins to degrade the slip properties through increasing viscosity. Conversely, the PEI does not exhibit a plateau and subsequent drop off of the slip stability with increasing concentration for the dispersant range studied. For TiC, both polyelectrolytes appear to be suitable dispersants for processing at their respective regions of the pH scale. The PMA-NH₄ provides sufficient stability at ~ pH 8.5, and the PEI provides essentially equal stability in the pH 4.5 region for the concentrations examined.