液压振动技术在大方坯连铸机上的应用

阐述了结晶器液压振动技术在沙钢集团永新炼钢厂大方坯连铸机上的应用,介绍了液压振动装置的基本工作原理,分析了沙钢永新炼钢-车间大方坯连铸机上结晶器液压振动系统在运行过程中出现的一些常见的故障,并提出了针对性的改进措施.     

结晶器液压振动机械故障分析

对生产实践中结晶器振动故障进行归纳总结,分析故障可能的原因,给出解决方法。     

基于虚拟仪器的结晶器实时监控系统

研究了基于虚拟仪器的结晶器激振系统的实时监控 ,主要包括振动伺服油缸的同步精度、伺服阀故障、油源故障等     

西钢电炉厂连铸结晶器振动系统改造

采用非正弦振动技术,对连铸机结晶器振动系统进行了改造。改造后的系统提高了铸坯质量,减少粘结漏钢事故,减少设备故障,保证生产顺利。     

板坯连铸结晶器振动伺服阀故障诊断与排除

针对板坯连铸结晶器振动伺服阀的故障特征,利用伺服阀检测平台,分析了故障产生的原因和排除方法,并根据伺服阀使用要求制定了一系列维护措施.     

板坯连铸机结晶器振动系统故障分析与治理

介绍了天津钢铁有限公司4^#板坯连铸机结晶器振动系统，根据液压系统原理对故障现象进行逻辑分析，利用排除法查找故障，找出发生故障的部位，进行修复，保证了生产的顺利进行。     

结晶器液压振动台振动状态检测与分析

结晶器振动在连铸生产中具有重要的作用,液压振动是近年来被开发并逐渐推广应用的结晶器振动方式.基于板坯连铸结晶器液压振动装置,通过检测结晶器液压振动装置的位移等参数,对振动系统的振动状态的检测与评价进行试验研究.分析了不同振动参数下两侧液压缸位移偏差、相位差随振动参数的变化规律.结果表明,结晶器液压振动装置具有较高的振动精度.为液压振动条件下结晶器振动状态的检测与评价提供了一种方法.     

转炉板坯连铸机结晶器振动系统改造

采用板坯非正弦振动技术，对转炉板坯连铸机结晶器振动系统进行了改造。改造后的系统可改善铸坯质量，减少粘结漏钢事故，减少设备故障，保证生产顺利。     

连铸结晶器对称性振动的优化形式

从结晶器振动的工艺效果和使用效果两方面，对几种结晶器对称性振动形式进行了分析，指出了结晶器正弦振动并不是对称性振动的最佳形式，给出了结晶器对称性振动的极限形式和优化形式。     

结晶器振动技术的发展

介绍了连铸连轧结晶器振动技术的发展历史和现状，简单分析了结晶器正弦振动和非正弦振动形式并讨论了结晶器振动和润滑的关系。     

小方坯连铸机结晶器振动装置设计及特点

小方坯连铸机结晶器振动装置采用半板簧结构,双偏心驱动,内弧侧布置,设有弹簧过载保护装置,集合了仿弧精度高、结构简单、重量轻诸多优点。通过ADAMS机械系统动力学仿真分析软件创建振动系统虚拟样机模型,用其求解器对系统进行运动学分析,然后进行设计优化,获得高仿弧精度的结晶器振动装置的结构位置关系。最后对振动装置进行动态静力学分析,计算驱动力矩,为电机的选取和强度校核提供了依据。     

板坯连铸机结晶器调宽控制系统故障分析及改进

介绍了板坯连铸机结晶器调宽控制系统的基本结构和工作原理。对结晶器调宽控制系统在运行中出现的电气接地、制动器抱死、脉冲编码器等故障现象原因进行了分析,提出了相应的改进措施,改进后结晶器调宽控制系统运行效果良好,操作便捷,保证了生产的安全稳定性。     

连铸机振动台、结晶器及扇形Ⅰ段互换性研究

从结晶器、扇形Ⅰ段、振动台及其对应使用的对中台进行分析 ,查找不能实现整体互换的原因 ,研究探讨了实现整体互换的具体措施 ,使圆坯连铸机实现了振动台、结晶器、扇形Ⅰ段的整体互换 ,方坯连铸机实现了振动台和扇形Ⅰ段的整体互换     

Development of mechanical drive type non-sinusoidal oscillator for continuous casting of steel

Abstract

A relatively simple mechanical drive type non-sinusoidal oscillator has been developed, based on mechanical theory. In this oscillator, a non-circular gearbox is additionally installed between the electromotor and eccentric cam. Compared with a servohydraulic type mould oscillation unit, this oscillator has the advantage that a non-sinusoidal oscillation mode can be used without the need for a large modification to the existing sinusoidal oscillator. In the present paper, the mechanical realisation of the oscillator is analysed, and the features of mechanical drive type non-sinusoidal oscillation are discussed. The design of the oscillator has been verified by measuring mould oscillation displacement. Plant experimental results have shown that the depth of the oscillation mark is reduced, and the surface quality of the cast product is improved, by using the oscillator.     

Friction Forces between Mould and Strand Shell during Billet Casting

During continuous casting processes lubrication between mould and strand shell is very important for reaching and maintaining a good surface quality of both the as‐cast strand and the finished product. The lubrication is influenced by the properties of the mould powder but also by the friction forces caused by the periodic movements of mould and the descending strand shell. In the present research measurements were carried out to investigate the friction forces during 150 mm sq. billet casting of different steel grades using mould powder or granules and submerged entry nozzles. The friction forces reached values up to 6 kN. Since friction forces are depending on upward and downward movements within the mould‐strand‐system, the evaluation of a rheogram shows the typical change of pressure and tension. Maximum friction forces arise during the positive strip time of the rising mould, introducing tensions and cracks in the as‐cast strand. On the other hand lowest frictions forces are generated by the descending mould within the negative strip time leading to the healing of faults in the as‐cast strand. These industrial experiments indicate a correlation between friction forces and surface quality of as‐cast strands.     

圆坯连铸机技术改造

天津钢管公司对电弧炉和连铸机进行了高效化改造，通过优化中间包参数，解决了高拉速下连铸圆坯钢液的纯净度问题；运用新式结晶器振动机构，解决了结晶器内润滑及圆铸坯表面质量问题；运用结晶器电磁搅拌技术，解决了铸坯内部柱状晶发达易形成中心缩孔及疏松问题。经过上述技术改造，使圆坯连铸机年产量由60万t提高到90万t，铸坯的综合合格率为99．66％。     

DYNAFLEX液压振动装置--小方坯连铸技术的突破

1997年12月,带有板簧导向系统和液压传动机构的DYNAFLEX结晶器振装置安装在莱希钢公司2台小方坯连坯铸机中的1台上进行中试,经这1年严格操作条件下的连续运行,证实其具有令人信服的优点,随后,莱希钢公司的2台小方坯连铸机相继安装了DYNAFLEX结晶器振动装置,并分别于1999年1月年2000年5月投产,生产结果表明,安装DYNAFLEX振动装置后小方坯的产品质量明显改善,铸机作业率提高,维修成本降低。     

Optimization of Oscillation Model for Slab Continuous Casting Mould Based on Mould Friction Measurements in Plant Trial

Lubrication and friction between the mould and strand are strongly influenced by mould oscillation, and play an important role in slab quality and operating safety during continuous casting processes. Investigation of mould oscillation is therefore essential for getting a better online control of the mould processes. A feasible approach for the development and optimization of mould oscillation was put forward, which combined online measurement of mould friction, design of negative oscillating parameters and evaluation for powder consumption. Three different control models including sinusoidal and non-sinusoidal oscillation for mould oscillations were developed to investigate and evaluate the effects of oscillation on mould friction and powder lubrication. For the purpose of investigating mould friction between mould and strand, online measurement was carried out on a slab continuous caster equipped with a hydraulic oscillator. Also the comparison of the mould friction in sinusoidal and non-sinusoidal mould oscillation was made for subsequent analysis. The industrial experiment result shows that the combination of inverse control model and non-sinusoidal oscillation mode will contribute to the proper powder consumption, leading to a suitable effect of friction force on strand surface, especially for high speed continuous casting. The proposed method provides reliable basis for guiding and optimizing mould oscillation among control models, sinusoidal oscillation and non-sinusoidal oscillation.     

连铸结晶器振动技术的发展及应用

连铸结晶器振动装置的发展是随着人们对连铸工艺技术认识的不断深入而不断发展的过程.由于对振动曲线提出的不同要求,从而应运出不同形式的振动装置.重点介绍了京唐公司连铸液压振动的特点及应用.     

变参数法优化方坯连铸机结晶器振动参数

研究如何用变参数法优化结晶器振动装置的振动参数,使振动装置在满足工艺要求的条件下,稳定性和可靠性均能得到有效的提高。