Aluminum-zinc alloy squeeze casting technological parameters optimization based on PSO and ANN

This paper presents a kind of ZA27 squeeze casting process parameter optimization method using artificial neural network (ANN) combined with the particle swarm optimizer (PSO). Regarding the test data as samples and using neural network create ZA27 squeeze casting process parameters and mechanical properties of nonlinear mapping model. Using PSO optimize the model and obtain the optimum value of the process parameters. Make full use of the non-neural network mapping capabilities and PSO global optimization capability. The network uses the radial direction primary function neural network, using the clustering and gradient method to make use of network learning, in order to enhance the generalization ability of the network. PSO takes dynamic changing inertia weights to accelerate the convergence speed and avoid a local minimum.     

Research progress on squeeze casting in China

Squeeze casting is a technology with short route,high efficiency and precise forming,possessing features of casting and plastic processing.It is widely used to produce high performance metallic structural parts.As energy conservation and environmental protection concerns have risen,lightweight and high performance metal parts are urgently needed,which accelerated the development of squeeze casting technology over the past two decades in China.In this paper,research progress on squeeze casting alloys,typical parts manufacturing and development of squeeze casting equipment in China are introduced.The future trend and development priorities of squeeze casting are discussed.     

基于连铸生产大数据的热轧卷质量预测模型

板坯热送热装或连铸连轧技术逐渐被越来越多的钢厂采用,然而其进一步发展受到连铸坯质量的制约。故针对连铸坯缺陷的有效判断可避免存在质量问题的铸坯进入轧制环节,从而降低额外的能耗。基于对铸坯质量的在线检测困难这一问题,从生产大数据的角度建立了板坯热轧卷的质量预测模型。首先根据正常与缺陷产品高度不平衡的数据特点,提出了相关性分析、不平衡数据随机分类与主成分数据降维三者相结合的数据预处理方法,随后选择GA-BP神经网络算法构建了针对低碳钢、包晶钢和中碳钢的热轧卷质量预测模型。预测模型具有较高的准确率,其中低碳钢模型总体预测准确率达到94.7%,缺陷预测准确率为82.8%;包晶钢模型总体预测准确率达到93.3%,缺陷预测准确率为87.5%;中碳钢模型总体预测准确率为85.4%,缺陷预测准确率为87.3%。最后,基于Python语言编写了热轧卷质量在线预测软件,可对热轧卷质量进行实时预测,方便快速地溯源缺陷发生原因。     

连铸工艺参数对板坯凝固终点的影响

以Q235钢为试验对象,利用射钉法在铸坯1/4位置处测量出230 mm×1 510 mm断面在1.05 m/min拉速下的坯壳厚度,以此为基础,优化凝固计算模型,确定液相穴长度及凝固终点,并验证了铸机预报结果;通过计算结果分析连铸拉速、浇铸过热度及二冷比水量等工艺参数对连铸板坯的凝固终点位置的影响,得到了液芯长度与拉速、比水量等工艺参数之间的拟合关系,从而获得铸坯的凝固规律,为铸坯凝固末端轻压下及电磁搅拌技术的应用提供了有效的依据。     

协同设计中的应用共享技术研究

文章针对目前应用共享的国内外研究现状,从应用共享的原理入手,对应用共享的一个核心问题--共享机制以及按共享机制的分类进行了分析和研究,进而讨论了应用共享的实现过程所涉及到应用共享实现方法.并通过协同设计工具及系统的开发对实现应用共享过程中遇到的问题,提出了一些相对较优的解决办法.     

汽车压铸及铸造铝合金

介绍了汽车铝合金中压铸、铸造合金的比例,变化趋势,在某些国家地区的产量。详细介绍了日本和美国近些年来各类汽车铝材的发货量,中国和日本压铸、铸造铝合金的化学成分、性能、特点及应用,各种铸造铝合金的热处理规范,汽车用高强度铸造铝合金的特点,典型汽车铸造铝产品的选材、生产与性能。介绍了压力铸造、金属型低压铸造、科斯沃斯法、气化模铸造工艺,列出了低压铸造工艺生产的各类铸件特征、材料和工艺。预测了汽车用铝的前景。     

Rapid precision casting for complex thin-walled aluminum alloy parts

1 .IntroCtion Seleetive Laser Sintering(SLS)15 an imPortant field ofRaPid PrototyPing(RP),due to its caPability ofProeessinga very wide range ofmaterialsinadireetway.AtPresent,most of sintering materials are nonmetallie,     

板坯高拉速的研究与实践

连铸机的高拉速生产是大幅度提高连铸生产效率的最有效措施之一。为了解决连铸中间包寿命低与连铸机拉速慢而导致炉机不匹配的问题,从中间包寿命提高与拉坯速度调控两方面入手,通过优化设备结构与提高连铸机效率两种手段对生产工艺进行优化。结果表明,整体工艺优化后可以大幅提高炉机匹配能力,加快钢水消耗,并提高了连铸机的生产效率,为高效连铸打下了坚实基础。     

连铸坯拉速对结晶器卷渣现象的影响

高拉速连铸具有高效、低成本的特点,是未来连铸的发展方向。以常规板坯结晶器为研究对象,采用大涡模拟方法对结晶器内的卷渣现象深入分析。结果表明,在连铸坯拉速较低的情况下,结晶器流场较为稳定,钢液冲击速度较小,上返流速度较小,界面波动幅度不大。在高拉速的情况下,钢液冲击速度增加,渣金界面速度及卷渣数量明显提高。通过界面最大速度分析,建立了一个临界卷渣速度的计算准则,发现不同拉速情况下的临界卷渣速度是不一样的,造成这种现象的原因在于卷渣机理的不同。本模型对控制常规板坯高拉速连铸生产具有一定指导意义。     

方圆坯连铸结晶器锥度的测量及分析

在连铸过程中,结晶器锥度对提高连铸机的产量、改善铸坯质量、延长结晶器的寿命都起着决定性的作用。本文简要介绍了连铸中结晶器锥度的作用,分析了方坯及圆坯结晶锥度的设计原则,并以不同方坯及圆坯结晶器内腔尺寸测量数据为基础,分析了结晶器锥度在生产过程中存在的问题。     

KW线铸造车间熔炼工部设计

为了给KW线铸造有箱车间生产提供稳定的、质量可靠的铁水,同时满足安全、可靠性、环保等方面的要求,本文对熔炼工部产能进行了计算,对工部布局情况、工艺选择情况进行介绍,设计了3路供电系统,应急排水系统,通风除尘系统。目前该车间已经投入生产,运行效果良好。     

5183铝合金小直径圆铸锭熔铸工艺研究

生产焊丝用的5183铝合金小规格铸锭铸造时容易产生拉裂缺陷,铸锭的冶金质量也难以保证。在合金成分优化、熔炼和净化技术、铸造工艺参数等方面进行了试验研究,对制得的铸锭进行表面质量、化学成分偏析、高倍组织、力学性能检查,结果表明,所确定的合金成分、熔炼铸造工艺技术和参数能够生产出合格的铸锭,为焊丝的生产提供优质的铸锭。     

柔性加工系统FMS的Web数据库开发

论述了建立制造企业网与Web数据库的必要性。分析了互联网络环境中柔性加工单元的制造模式。详细讨论了用JDBC编写Web数据库应用程序的原理。最后分析了Web数据库存在的安全防护问题     

Continuous squeeze casting process by mass production

S queeze casting has been widely used for automotive struc tural parts because it offers a vast material selection from aluminum and magnesium alloys. In comparison with low pressure die casting, squeeze casting also overcomes many fluidity problems and thus it can use both hypereutectic and hypoeutectic alloys such as 319, 383 and 390. Squeeze casting can also apply “spot solidification” technology in addition to directional solidification method. The shortcoming of directional solidificati…     

The tilt casting process

Tilt casting is a process with the unique feature that, in principle, liquid metal can be transferred into a mould by simple mechanical means under the action of gravity, but without surface turbulence. It therefore has the potential to produce very high quality castings. Even so, the process is not often optimised in the industrial environment. This investigation represents an attempt to investigate some fundamental problems associated with the process.

A computer controlled, programmable roll-over casting wheel with a diameter of 1 m was used to produce sand castings in an Al-4.5% Cu alloy. The filling of the mould was studied using realtime X-ray radiography. Real-time X-ray radiography revealed that the molten metal could exhibit tranquil, turbulent or chaotic flow into the mould during tilt casting, depending on (i) the angle of tilt of the mould at the start of casting, and (ii) the tilting speed. Essentially horizontal transfer of the melt could achieve tranquil filling of the mould with minimum surface turbulence by a tilt starting position above the horizontal. The tensile properties of castings made using various starting conditions and rotation rates were measured and the results analysed using Weibull statistics to quantify reliability. Results are summarised on a map of the various operating regimes for tilt casting. An operational window for the production of reliable castings has been defined for the first time.     

渤铝公司的铝板铸轧机简介

介绍了渤铝公司引进法国 PECHINEY公司研制的 3C铝板铸轧机的主要特点和先进技术。     

Vacuum-sealed casting process under pressure

I t is of great im portance to investigate the casting processes forhigh precision thin wallferrous m etalparts because the processes are helpful in reducing energy consum ption,saving raw m aterials and decreasing m achine weight.To achieve these objectives,m any casting m ethods have been developed.Vacuum -sealed m olding process,the V-processforshort,iswidely used to m ake iron castingswith relatively thin wall,high precision and sm ooth surface [1-4]. H owever,the process cannotbe used to …     

衬铁的消失模铸造

介绍了消失模铸造衬铁的工艺,通过消失模铸造与湿砂型铸造的比较,得出消失模铸造的优点.     

普通结晶器铸造与低液位铸造所得5083合金扁锭质量差异分析

对老线普通结晶器铸造和新线低液位铸造所得5083合金扁锭进行了质量对比,分析了两种铸锭性能差异的原因。     

Microstructures of electromagnetic casting and direct chill casting LY12 aluminum alloys

1　INTRODUCTIONElectromagneticcasting (EMC)isatechnologydevelopedbythecombinationofmagnetohy drodynamics (MHD )andcastingengineering[13] .TheEMCtechnologydependsontheelectromagneticforcetopreventthemetalfromtouchingthemold .Dependingontheinteractionofeddycurrentsinducedinthemetalandthemagneticfieldoftheinductor ,theliquidmetalcolumniskeptstable[4 6 ] .Thecon tactlesscastingofEMCmayeliminatetheliquidationbuild upsandfeathercrystals ,relievethescalpingop erationbeforethehotrollprocess …