半固态镁合金流变压铸型腔充填过程模拟

应用计算机数值模拟技术,模拟了镁合金液态压铸和半固态流变压铸的型腔充填过程.在相同条件下,半固态流变压铸成形的型腔充填过程平稳,卷气现象少于液态金属压铸成形.半固态镁合金压铸零件能够进行热处理,铸件内在质量优于液态镁合金压铸件.     

飞速发展的压铸技术——第二届中国国际压铸会议评述

介绍了“第二届中国国际压铸会议”概况 ;根据会议宣读的论文 ,分压铸工艺、压铸设备、镁合金压铸、锌合金压铸、计算机在压铸中的应用等五个方面 ,评述了压铸技术的发展与现状     

飞速发展的压铸技术：第二轴中国国际压铸会议评述

介绍了“第二届中国国际压铸会议”概况；根据会议宣读的论文，分压铸工艺、压铸设备、镁合金压铸、锌合金压铸、计算机在压铸中的应用等五个方面，了压铸技术的发展与现状。     

镁合金压铸技术的几个主要问题及其应用前景

本文综述了近年来镁合金压铸技术研究开发情况，并就压铸镁合金高温使用性能、耐蚀性、阻燃性、压铸方式、安全生产、压铸型设计等镁合金压铸技术的几个主要问题作了详细的论述和分析，提出了解决的方案。由于我国原镁产量居世界首位，占全球产量的三分之一，随着我国汽车工业的发展，压铸镁合金及其相关技术具有广阔的应用前景。     

镁合金压铸件生产关键技术

镁合金作为新型高性能压铸合金正得到越来越多的应用，但其生产技术尚待进一步完善，本文简介了镁合金村铸生产中熔炼和保温的防氧化措施、精炼和覆盖的特点，模具材质选择，加料装置要求，设备情况及工艺参数设计等有关技术问题。     

压铸技术的研究现状及进展——第三届中国国际压铸会议评述

介绍了“第三届中国国际压铸会议”概况 ,分析了会议论文特点 ,对会议宣读的论文分压铸的研究和生产现状、镁合金及其成形技术、铝锌合金挤压成形技术、计算机在压铸领域中的应用、压铸装备及生产管理等 5个方面分别进行了综合评述 ,指出了压铸生产和技术的进展 ,简单评价了压铸技术与生产的现状     

浅析镁合金压铸的历史、现状和未来

镁合金具有优越的压铸工艺性能和工程使用性能。它以压铸件的形式进入工业领域的50年历史经历了初期发展、中期收缩、后期再发展的曲折过程。在这个过程中,什么是推动镁合金压铸发展的动力?什么是导致其收缩的阻力?对此,本文做出了评判:能否正确处理镁合金化学活性对压铸工艺过程和使用过程的影响是关键。同时,文章还对今后镁合金压铸进一步发展的工艺技术支撑作了归纳、分析。     

镁合金半固态流变压铸充型流动过程分析

通过压铸实验分析了镁合金半固态流变压铸、液态压铸充型流动过程.结果表明,镁合金半固态流变压铸和液态压铸充型流动过程相似;相同充型条件下,半固态流变压铸卷气现象较少,压铸件质量优于液态压铸.同时,内浇道充型速度和内浇道尺寸对压铸件充填过程影响很大,合理的设置可以减少涡流和卷气,得到高质量的压铸件.     

镁合金铸造成型最新研究进展

近年来镁合金在汽车轻量化方面发挥了积极的作用。为了适应镁合金快速发展的需求,镁合金的铸造技术,尤其是压铸技术得到了长足的发展。在传统铸造工艺的基础上介绍了几种镁合金铸造工艺的新进展,主要包括镁合金真空低压消失模铸造新技术、镁合金液态压铸锻造双控成型技术、充氧压铸技术、真空压铸技术、半固态压铸技术、镁合金双辊连续铸轧技术及镁合金电磁连续铸造技术。     

富来远东公司组织镁合金压铸考察团赴德国考察镁合金压铸技术及设备

镁合金压铸是目前压铸行业的特点,在亚洲地区,如台湾、新加坡、韩国等地,都有迅猛的发展。在中国内地,也引起了有关方面的高度关注。 众所周知,德国在镁合金压铸件技术方面,处于世界领先地位。为了使中国的压铸同业进一步了解当前世界镁合金压铸方面的最新进展,富来远东公司专门组织了镁合金压铸考察团,到德国进行了考察,成员包括大学研究学者,镁合金压铸专家等。考察团在德国考察了富来公司、阿伦大学、MONEVA压铸厂、AHC公司等。     

压铸镁合金及其在汽车工业中的应用

论述了镁合金的性能优点及其在汽车工业中的应用情况 ,介绍了镁合金材料、熔炼及压铸工艺等方面的研究进展 ,并指出了今后的发展趋势     

压铸镁合金及其在汽车工业中的应用

论述了镁合金的性能优点及其在汽车工业中的应用情况,介绍了镁合金材料、熔炼及压铸工艺等方面的研究进展,并指出了今后的发展趋势。     

压铸镁合金在汽车工业中的应用和发展趋势

论述了压铸镁合金用于汽车轻型结构件的性能优势 ,分析和介绍了一些主要牌号压铸镁合金的化学成分、成型工艺和使用性能特点以及在发达国家汽车工业中的应用现状和发展趋势。依此呼吁 ,作为头号镁资源大国的中国 ,压铸镁合金的研究、开发与应用已势在必行     

镁合金在中国压铸工业中的应用—世界镁合金压铸与中国

从分析世界镁合金压铸工业看到中国镁压铸发展的必然趋势,以镁合金的性质和各种应用实例为借鉴,提出中国发展镁合金压铸应注意的几个问题。     

Modeling of high temperature- and diffusion-controlled die soldering in aluminum high pressure die casting

Soldering of cast alloys to the dies has been a continuing source of die surface damage in the aluminum die-casting industry. To reduce the repair and maintenance costs, an approach to modeling the damage and predicting the die lifetime is required. The aim of the present study is the estimation of the die lifetime based on a quantitative analysis of die soldering in the framework of the numerical simulations of the die-casting process.Full 3D simulations of the process, including the filling, solidification, and the die cooling, are carried out using the casting simulation software MAGMAsoft. The resulting transient temperature fields on the die surface and in the casting are then post-processed to estimate the die soldering.The present work deals only with the metallurgical/chemical kind of soldering which occurs at high temperatures and involves formation and growth of intermetallic layers. The die-soldering model combines two approaches available in literature, describing the two aspects of die soldering: the growth of the intermetallic layer, and the thermal and metallurgical conditions in the layer that lead to the die soldering. The theoretical model is then extended with the treatment of the intermetallic layer growth controlled by the idealized effective diffusivity and with the treatment of solder strength dependent on the temperature and liquid fraction within the layer. The solder strength locally on the die surface is calculated as a function of the number of die-casting cycles. This also provides the estimation of the die lifetime defined as the number of cycles until the critical solder strength level is reached.Proper validation of the model is required, and the model parameters (the critical solder strength value, among others) need to be calibrated by measurements and data from the die-casting industry.As an example, the model is applied to several cases of high pressure die casting (HPDC) where A380 alloy parts are cast in the H13 steel die. The predicted locations of the higher strength of soldering appear in the “hot spot” areas of the die surface in agreement with the reports in literature. The influence of several casting process parameters such as cooling/spraying efficiency and other parameters that control the thermal history of the die and the casting is in agreement with the expected behavior.     

Characterization and Modeling Study on Interfacial Heat Transfer Behavior and Solidified Microstructure of Die Cast Magnesium AlloysEI北大核心CSCD

Magnesium alloys are widely used in various fields because of their outstanding properties. High-pressure die casting (HPDC) is one of the primary manufacturing methods of magnesium alloys. During the HPDC process, the solidification manner of casting is highly dependent on the heat transfer behavior at metal-die interface, which directly affects the solidified microstructure evolution, defect distribution and mechanical properties of the cast products. As common solidified microstructures of die cast magnesium alloys, the externally solidified crystals (ESCs), divorced eutectics and primary dendrites have important influences on the final performance of castings. Therefore, investigations on the interfacial heat transfer behavior and the solidified microstructures of magnesium alloys have considerable significance on the optimization of die-casting process and the prediction of casting quality. In this paper, recent research progress on theoretical simulation and experimental characterization of the heat transfer behaviors and the solidified microstructures of die cast magnesium alloys was systematically presented. The contents include: (1) A boundary-condition model developed based on the interfacial heat transfer coefficients (IHTCs), which could precisely simulate the boundary condition at the metal-die interface during solidification process. Accordingly, the IHTCs can be divided into four stages, namely the initial increasing stage, the high value maintaining stage, the fast decreasing stage and the low value maintaining stage. (2) A numerical model developed to simulate and predict the flow patterns of the externally solidified crystals (ESCs) in the shot sleeve during mold filling process, together with discussion on the influence of the ESCs distribution on the defect bands of die cast magnesium alloys. (3) Nucleation and growth models of the primary alpha-Mg phases developed by considering the ESCs in the shot sleeve. (4) Nucleation and growth models of the divorced eutectic phase, which can be used to simulate the microstructure evolution of die cast magnesium alloys. (5) The 3D morphology and orientation selection of magnesium alloy dendrite. It was found that magnesium alloy dendrite exhibits an eighteen-primary branch pattern in 3D, with six growing along < 11(2)over bar0 > in the basal plane and the other twelve along < 11(2)over bar3 > in non-basal planes. Accordingly, an anisotropy growth function was developed and coupled into the phase field model to achieve the 3D simulation of magnesium alloy dendrite.     

镁合金成形技术的开发与应用

概述了镁工业的发展过程及现状，镁合金的基本特性和优良性能，镁合金在电子、汽车、自行车等行业的应用情况及前景，常用铸造镁合金和变形镁合金的成分、力学性能及特性，镁合金压铸技术的现状与发展前景，变形镁合金制品的生产方法和镁合金的超塑性。     

AZ31B镁合金薄壁壳形件真空压铸模的设计

利用模内直接抽真空的方法可以解决镁合金薄壁壳形件流程长、填充型腔困难的问题,同时可减少镁合金的氧化和内部气孔、提高压铸件致密度、减小变形和达到高的表面质量要求。分析了薄壁壳形件镁合金真空压铸模设计的要点,指出了模具浇注系统、排溢系统、冷却系统和推出机构等的设计与常规压铸模具设计之间存在的差别,确保真空压铸成型工艺能够顺利实现。     

车轮平衡块简易低压铸造装置

汽车车轮平衡块是用来平衡汽车车轮的零件,由铅锑合金压铸而成。介绍汽车车轮平衡块低压铸造简易装置的结构原理及该设备用于低熔点合金铸造的优越性。使用结果表明,该设备生产效率高,操作简便,性价比也较高。     

基于CAE分析的压铸镁合金模具温度场分布初探

用数值模拟的方法,计算并对比分析了浇注温度和模具预热温度对镁合金、铝合金压铸件及压铸模具温度场的影响,得出了压铸镁合金模具温度场的分布特征.