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.     

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。     

降低铝锭的废品率

分析了中铝公司青海分公司第三电解厂铸造车间铝锭存在废品率的现状,以及采取降低铝锭废品率的有效措施。     

浅析降低铝锭表面波纹的措施

从铝电解铸造铝锭时影响铝锭表面的因素出发，结合现有设备实际状况，阐述了降低铝锭表面波纹的措施，通过设备改造不仅取得很好的应用效果，而且取得很好的经济效益。     

浅谈降低铝锭的废品率的措施

铝电解厂的铝锭废品率在所难免。但废品率的高低。直接影响着企业的效益。本文主要分析了中铝公司青海分公司第三电解厂铸造车间铝锭存在废品率的现状，以及达到降低铝锭废品率所采取的有效措施。     

铝液分配器的改进

针对20 kg铝锭连续铸造机组中使用铝液分配器的几个问题,如浇铸管设计不合理和采用滑石粉防止粘铝而造成铝锭外观质量下降,铝液对分配器内壁的浸蚀降低了寿命,提出了改进浇铸管的结构和分配器内壁采用陶瓷涂层的措施,有利于提高铝锭表面质量和延长分配器使用寿命。     

实现铝锭堆垛、称量、打包一体化控制系统的研究

针对国内大多数铝锭生产企业在铝锭打包过程中采用人工作业方式存在的问题，根据铝锭生产工艺、技术要求以及现代科学生产管理理念，开展铝锭称量、堆垛、打包一体化控制系统的研究，在原有铝锭堆垛机控制系统上，实现铝锭自动化流水作业的功能，提高了铝锭生产工艺过程的自动化作业程度。     

重熔铝锭铸造车间混合炉危险源的产生及其处理方法

分析了重熔铝锭铸造车间混合炉的危险源及其产生原因,提出了危险源的处理措施,生产实践表明,这些措施切实可行。     

20kg铝锭连续铸造机组技术改造

介绍了改造恢复20kg铝锭连续铸造机组中采取的技术改进措施。     

铝锭贸易标准与出口对策

铝锭主要贸易标准概述Asketchofstandardofmainaluminumingotstrade目前国际市场普遍认可的铝锭贸易标准是国际标准、国际牌号注册协议组织铝锭牌号标准(即美国铝业协会AA铝锭牌号)以及欧盟标准。在目前的国际化大市场背景下,争夺国际标准的话语权成为各个工业发达国家在国际标准化工作中的重要任务。铝锭国际标准的制订和修订非常形象的反映了这个现象。铝锭国际标准是由ISO/TC79/SC4(国际标准化组织“轻金属及其合金”技术委员会—“铝锭”分技术委员会)负责制订和修订,秘书处设在日本。目前日本已经没有了原铝生产,因此实际主导力量…     

Aluminium/polyimide adhesion

We present a theoretical study of the interactions between isolated aluminium atoms and a polyimide surface and between polyimide and aluminium surface. The effect of surface modification on adhesion is also discussed. Self-consistent geometry optimization and molecular orbital calculations have been carried out within CNDO approximation in a cluster model framework. Our results suggest that aluminium atoms react preferentially with five and six-fold rings of polyimide when those chemical groups are present on the surface. The compound formation is accompanied by charge transfer from the metal atoms to polyimide and charge rearrangement among the polyimide atoms. Madelung potential calculations also suggest considerable core level shifts at polyimide atoms far from the reaction site. The adhesion of polymide to aluminium surface is predicted to be somewhat weaker than that of aliminium to polyimide.     

粉末喷涂在铝型材处理中的应用

粉末喷涂是当今铝型材一项重要的表面处理方式，本文介绍粉末喷涂较其他处理方式的优势，粉末喷涂的基本原理，以及粉末喷涂各工序常见问题的处理。     

急冷铝基钎料箔表面特征研究

通过金相显微镜和扫描电镜对急冷铝基纤料箔两个表面的观察分析表明，急冷钎料箔正面和自由面的微观特征明显不同。纤料箔正面具有周期性分布的波浪形气痕、纵向的撕裂沟痕和模体沟痕；而自由面上具有周期性分布的箭头状气痕、圆形气坑、纵向摩擦沟痕、随机分布的山丘状隆起和弥散分布的圆形小凸起等现象，本研究分析了这些现象的成因并提出了相应的解决办法，为制备表面质量较高的急冷铝基钎料箔提供依据。     

6063铝型材表面“斑状”缺陷综述

对生产过程中引起6063铝型材“斑状”表面缺陷的原因进行分析,为消除斑点,提高产品质量提供了全面的思路和方法。     

Prediction of aluminium concentration in molten zinc pot of continuous hot dip galvanising line

Abstract

The strict control of aluminium concentration in a galvanising pot is extremely important to meet the high surface quality of galvanised steels that has been demanded by the industry. The present study proposes a mathematical model for the prediction of aluminium concentration in a galvanising pot of a continuous hot dip galvanising line. It is assumed that aluminium in the molten zinc pot is consumed as coating layer, dross, and inhibition layer. The quantities of aluminium consumed as dross and inhibition layer in the molten zinc pot are evaluated using the results of physical model experiments available in the literature. The operation conditions of the continuous hot dip galvanising line are online collected and then used as input data for the model. It is found that dross is a main source of the preferential consumption of aluminium in the molten zinc pot. The predicted pot aluminium concentration follows the trend of experimentally measured values rather well during both galvanising and galvannealing operations.     

刮板清理机崩刀及错位问题的分析及解决办法

焙烧后碳块表面清理是大型电解铝厂中一个重要工序，而刮板清理机是当今世界各现代化铝厂普遍采用的设备，我国贵州铝厂进口及国产翻版的该设备在使用中都存在严重的崩刀及错位问题，致使设备基本处于停用状态。该问题已经影响到各新建铝厂。本文详细分析了该设备造成崩刀错位的各种原因，并给出了相应的解决办法。     

消除铝板带材表面油污的措施

结合平阴铝厂铝板带材生产的实际情况,采用增设二次吹扫装置,控制工艺润滑油油质及改进退火工艺等措施,消除了铝板带材表面油污。１９９８年铝板带材表面质量批次合格率达到１００％。     

Modelling of heat flow and interdendritic crack formation in twin-roll strip casting of aluminium alloys

Preliminary mathematical analyses of different interdendritic cracks associated with variation of heat transfer and generation of interdendritic strain in horizontal twin-roll strip casting have been investigated. A 1-D transient finite difference model of heat flow, dendritic solidification and interdendritic thermo-metallurgical strain has been developed. The model contains two cracking criteria to predict qualitatively and quantitatively the tendency of interdendritic crack formation during dendritic solidification of pure aluminium and 6022 aluminium alloy. The model predictions are compared to available analytical methods and previous measurements. This is to verify and calibrate the model where good and reasonable agreements are obtained, respectively. The variations of heat transfer modes during different contact cooling zones and their effects on the generation of interdendritic thermo-metallurgical strain at the surface and central strip locations have been analysed. The model predictions point out that the different contact cooling zones of strip surface and surroundings control the stages of interdendritic crack formation in different mushy regions. The mechanism of interdendritic crack formation in twin-roll strip casting process with previous and present cracking criteria have been explained and discussed. These discussions show the importance of selection of mathematical treatment to predict the stages of interdendritic crack formation.     

氧化锌球团还原的机理研究

采用等温法研究了纯氧化锌配加石墨碳粉制成含碳氧化锌球团的还原动力学 ;考察了坩埚尺寸对氧化锌还原的影响 ;并研究了铝浴条件下对含碳或不含碳氧化锌球团还原的影响。结果表明 :根据Arrhenius方程计算出 ,当碳气化反应和界面还原反应为限制环节时 ,在 12 73～ 14 2 3K下其活化能分别为 3 7 615kJ/moL和 43 192kJ/moL ,碳还原氧化锌的还原速度由气相扩散所控制 ,12 73～ 14 2 3K下其活化能为 46 5 48～ 5 3 2 80kJ/moL ,含碳球团在大坩埚中的还原速度快 ,有铝浴存在的还原速度快 ;在 12 73～ 15 2 3K下铝浴与氧化锌球团 (不含碳 )基本不发生还原反应     

A Study of Aluminium Corrosion Inhibition in Acid Medium by an Antiemitic Drug

The inhibition effect of meclizine hydrochloride on the corrosion behaviour of aluminium in 1 M hydrochloric acid medium was studied by weight loss, potentiodynamic polarisation and electrochemical impedance spectroscopy techniques. Results obtained revealed that Meclizine performed excellently as a corrosion inhibitor for aluminium in HCl medium at 303 K. The effect of temperature on inhibition efficiency was studied. The inhibition was assumed to occur via adsorption of the inhibitor molecule on the metal surface. The adsorption of the inhibitor on the aluminium surface followed Langmuir adsorption isotherm model. The values of activation energy and thermodynamic parameters were calculated and discussed.