20kg铝锭连续铸造机组中铝锭脱模敲击装置的设计与应用

分析20kg铝锭连续铸造机组在生产使用过程中运行不连续、铝锭不脱铸模问题，设计并制作了铝锭脱模敲击装置。     

20kg铝锭连续铸造机打击装置的改进

分析了20kg铝锭连续铸造机打击装置存在的问题以及对铸造生产和铸模使用寿命的影响,提出并实施了一种新型打击装置,取得了良好效果。     

200kA铸造冷却水设备改造的经济分析

铝锭铸造机组是铝冶炼企业形成最终产品的重要工艺设备,设备的平稳运行和充分发挥机械效率,是保障日常生产需求与最终产品外观质量的基本条件。本文针对连城分公司200 kA铸造车间20 kg铝锭连续铸造机组循环水设施和铝锭连续铸造机组主体部分存在的问题和局部设计改造进行了论述与经济分析。通过对ATZJ2-20/16-Ⅱ.20 kg铝锭铸造机组的进一步优化改进,使日常生产中铝锭脱模率由设备改造前的20%左右,提升到了设备改造后的98%以上,生产过程中铝锭脱模率低、产品外观质量有缺陷的"瓶颈"问题得到了解决,在人力、财力、物力、电力方面节省了开支,同时企业经过工艺设备的优化改进,提高了水资源的再循环利用,进一步完善了企业节能减排工作目标,降低了铝锭的生产成本。     

国电投铝电青铜峡分公司创新项目获国家发明专利

正近日,国电投铝电青铜峡分公司申报的"普通铝锭铸造的流量监控系统"创新项目,获得国家发明专利,实现了铝液流量及铝锭单重在线控制,填补了国内连续铸造机铝液流量无法实现自动监控的空白。青铜峡分公司使用的国产连续铸造机,铝液流量采用人工检测,且流量监控均采用人工控制塞子的方法,造成操作人员长时间与高温铝液近距离接触,不仅劳动强度高、安全隐患大,同时影响铝锭合格率。针对此问题,青铜峡分公司采用"产-学-研"的方式,通过在20 kg铝锭铸造机铸模及船型溜槽上方各安装一个涡流传感器,检测铝水液面高度,     

20kg铝锭铸造机组脱模的研究

针对目前20kg铝锭铸造机组生产中脱模率低的问题,对影响脱模的因素进行了全面的分析,提出了多项改进措施,通过实践证明,脱模率达到了99%以上,另外推导出了脱模机构动力学方程。     

降低连续铸造中铝锭表面波纹的有效途径

本文通过对连续铸造中引起铝锭表面波纹的原因分析,从设备的本体入手,通过采取一系列行之有效的改造、设计等方法,减小了铸造机链条的颤动和敲击力对链条的振动,从而较好地减小了铝锭的表面波纹。     

美铝北冶工业(大连)有限公司

<正>美铝北冶工业(大连)有限公司始创于1987年。公司主要产品有铜、铝液压半连续铸造机、高速锯切机生产线,铝锭专用扒皮机、镗孔机。1992年我公司设计制造了中国第一台液压半连续铸造机;2000年我公司设计制造了中国第一台高速锯切机生产线。2003年我们设计制造了中国第一台出口国外的液压半连续铸造机及锯切机。2004年我们设计制造了中国第一台内导式油缸及内导式铸造机。同年,我们设计制造了中国第一台出口国外的铝锭专用车及镗孔机。我公司从1992年生产液压半连续铸造机,至今已为国内外厂家生产了100余台液压半连续铸造机。     

20 kg铝锭铸造机技术性能分析

针对兰州铝业股份公司使用的LDZZJ- 16型 2 0kg铝锭连续铸造生产线 ,对其主机———铸造机的机架结构、传动系统、控制系统等进行了分析。找到了影响铸造机平稳性的主要因素及其解决方法 ,为进一步提高铸造机的运行平稳性提供了理论依据。     

低速重载铅锭连续铸造机输送链系统动力学方程

为了更好研究低速重载铅锭连续铸造机"水波纹"的成因,对其主动轮以及紧边链条进行动力学建模与分析,而目前国内针对低速重载输送链的动力学研究较少,本文通过分别对输送链系统进行脱模前与脱模后的动力学建模研究,建立其动力学模型与方程,并利用Matlab求解其总的响应,为低速重载铅锭连续铸造机输送链系统动力学研究提供了一种新的有效的方法,并为研究铸造机"水波纹"现象奠定了理论基础。     

铸造机链条滚轮滑动原因的分析及改进

20kg连续铸造机是中铝青海分公司第一电解铝厂生产重熔铝锭的主要设备,其铸模的输送装置为链条结构形式滚子链,滚轮在链条的传动过程中的运动形式为滚动.但由于铸模轴结构设计及摩擦润滑方式的不正确,导致链条运动摩擦阻力增大,链条易产生瞬间的抖动使铝锭表面产生较大的波纹和飞边,影响铝锭表面质量.从铸模轴结构和摩擦与润滑的角度分析了20kg连续铸造机链条滚轮滑动原因,并提出了改进措施.     

铝锭表面波纹的成因和改善

针对20kg铝锭铸造机组生产的铝锭表面波纹较大的问题,从设计方案、制造精度、外部环境和干扰因素等方面进行了分析,提出了多项改进措施,实践证明,这些措施行之有效,明显消除了波纹,有效提高了产品的表面质量。     

Computer Simulation of Mannesmann Piercing of Aluminium Alloy Ingots

Russian Journal of Non-Ferrous Metals - The piercing of aluminium ingots (made by permanent mold gravity casting) is done in a Mannesmann rolling mill with supporting shoe using plugs of various...     

结晶器漏钢预报系统在济钢5~#连铸机中的应用

为了稳定生产和提高铸坯质量,济钢5#连铸机应用了结晶器漏钢预报系统,通过对生产过程中结晶器运行参数的处理,检测结晶器内铸流的漏钢趋势并发出报警信号,同时向连铸机L1级系统反馈降低拉速的信号,主要应用预报系统的热流画面与冷点检测、反粘钢和反漏钢等功能。预报系统应用后,降低了粘结漏钢事故的发生率,保证了产品质量,延长了设备寿命,改善了铸机岗位人员的操作条件。     

电渣重熔满足大型锻件的要求

 与锭模浇注出低密度、带缩孔铸锭相比,高性能铸锭材料的生产趋于用重熔设备来实现,铸锭的力学性能也会更均匀。水冷铜结晶器中重熔的铸锭具有较高的材料产出量,从而使具有相同最终外形的铸锭其单锭的质量更小,密度更接近于锻造的材料。因此,后续的锻造工艺不需要高锻造比来生产高密度铸锭。在100t以下的铸锭通常可以在固定锭模中生产,并配以外部底加热裝置,以避免可能的铸锭底部开裂;50t以上的铸锭采用高度复杂的拉锭系统配以多电极交换,在短的环形坩埚中重熔技术才是最经济的。大型的带有电极交换技术的电渣重熔炉,为生产超过钢厂中最大单个钢包浇铸质量的大尺寸铸锭提供了可能性。介绍了生产145t重铸锭的炉型设计。对于容易出现开裂的高度复杂的合金,可以通过应用隔热绝缘来生产。     

Microstructure and fatigue characteristics of direct chill cast and electromagnetic cast 2024 Al alloy ingots

The distinct advantages of the electromagnetic casting (EMC) process consist in the presence of stirring motions in the melt, which lead to significant grain size reduction in solidified ingot. Furthermore, surface and subsurface qualities are improved due to the absence of ingot mold. However, it is impossible to achieve the aforementioned advantages in conventional direct chill casting (DCC). In order to contrast the before and after heat treatments of the microstructural and mechanical characteristics of EMC and DCC 2024 aluminium alloys, optical microscopy, scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffractions (XRD), differential scanning calorimetry (DSC), etc. were carried out. Compared with the DCC ingot, the EMC ingot has better mechanical properties not only in the ascast condition but also in the as-aged condition. The DSC curves show that the EMC specimens have high enthalpy, i.e., the thermal kinetic energy to form precipitates during the aging treatment process. Despite heat treatments applied to the DCC ingot, it fails to attain the same mechanical properties as the EMC ingot. Moreover, considering the expernsive scalping operation for DCC ingots, the EMC technique, which offers a lower manufacturing cost, is one of the best manufacturing methods used in obtaining the ingots of wrought aluminum alloys.     

电子束冷床炉熔炼制备高纯金属钒铸锭

电子束冷床炉熔炼是一种新兴的金属精炼方法。利用电子束冷床炉的高温真空精炼特性,以钒成分为82%钒铝合金为原料,制备了纯度在99.7%以上的金属钒铸锭。详细论述了电子束冷床炉在熔炼钒铝合金时各杂质元素的去除机理行为,认为熔炼时较大的电子束照射功率对一次铸锭中铝的挥发去除有较好效果,但这种熔炼工艺却会影响到铸锭的最终氧含量。分析认为,两次小功率熔炼是符合设备特点的制备高纯金属钒铸锭的最佳熔炼工艺。     

Experimental investigation of thermomechanical effects during direct chill and electromagnetic casting of aluminum alloys

The deformation and the temperature field within direct chill (DC) and electromagnetic (EM) cast aluminum ingots have been measuredin situ using a simple experimental setup. The deformation of the cross section of the cold ingots has also been characterized as a function of the casting speed, alloy composition, and inoculation condition. The pull-in of the lateral rolling faces has been found to occur in two sequences for DC cast ingots, whereas that associated with electromagnetic casting (EMC) was continuous. The pull-in was maximum at the center of these faces (about 7 to 9 pct) and strongly depended upon the casting speed. Near the short sides of the ingots, the deformation was only about 2 pct and was nearly independent of the casting parameters and alloy composition. Based upon these measurements, it was concluded that the pull-in of the rolling faces was mainly due to the bending of the ingots induced by the thermal stresses. This conclusion was further supported by a simple two-dimensional thermoelastic model.     

A mathematical model of the heat and fluid flows in direct-chill casting of aluminum sheet ingots and billets

A finite-element method model for the time-dependent heat and fluid flows that develop during direct-chill (DC) semicontinuous casting of aluminium ingots is presented. Thermal convection and turbulence are included in the model formulation and, in the mushy zone, the momentum equations are modified with a Darcy-type source term dependent on the liquid fraction. The boundary conditions involve calculations of the air gap along the mold wall as well as the heat transfer to the falling water film with forced convection, nucleate boiling, and film boiling. The mold wall and the starting block are included in the computational domain. In the start-up period of the casting, the ingot domain expands over the starting-block level. The numerical method applies a fractional-step method for the dynamic Navier-Stokes equations and the “streamline upwind Petrov-Galerkin” (SUPG) method for mixed diffusion and convection in the momentum and energy equations. The modeling of the start-up period of the casting is demonstrated and compared to temperature measurements in an AA1050 200×600 mm sheet ingot.     

钢铁生产现代自动化系统的发展

介绍了最近开发的钢铁生产现代自动化系统的五个例子：连铸机拉漏报警系统；冷轧厂罩式退火炉计算机辅助操作管理系统；加热和热处理过程的在线自适应和最佳化数学模型；热轧机推料式加热炉模糊逻辑控制系统；热宽带钢轧机新过程自动化系统。     

Improving the plasticity of hard-to-work tool steel in continuous casting

Pulsed-continuous melt solidification is developed for the production of chill-cast ingots and continuous-cast billets of hard-to-work P6M5 steel. The introduction of pulsed-continuous melt solidification and linear-solidification heat treatment at OAO MMZ Serp i Molot has permitted the continuous casting of high-speed P6M5 steel on a radial machine (radius of curvature 9 m). The new method produces continuous-cast billets of increased plasticity, thereby eliminating the need for forging. The new system has been used to produce hot- and cold-rolled P6M5 steel sheet and bar.