板坯连铸机结晶器液压振动控制

本文根据酒钢目前采用的国际一流的奥地利VAI公司的板坯连铸机,对连铸关键技术结晶器(Mold)液压振动控制系统进行研究和设计,具有十分重要的现实意义。     

板坯连铸机结晶器液压振动控制

本文根据酒钢目前采用的国际一流的奥地利VAI公司的板坯连铸机,对连铸关键技术结晶器(Mold)液压振动控制系统进行研究和设计,具有十分重要的现实意义。     

连铸机结晶器的液压振动

Ｆｌｏｒａｎｇｅ厂的板坯连铸机上安装的结晶器振动装置非常灵活。该设备能产生非正弦振动，这是使超低碳汽车钢板生产中获得高标准皮下洁净度的决定性改进。     

连铸机结晶器振动参数的选择

介绍了梅山连铸机结晶器振动参数，并分析了振动参数与铸坯质量及生产操作的关系和存在问题，提出了更适合梅山连铸机性能的结晶器的振动参数。     

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。     

CSP连铸机结晶器振动故障分析及改进

介绍了结晶器振动装置的构成及原理,分析了结晶器振动传感器故障导致停振与高拉速引起的偏振故障的原因,以及对故障进行的针对性改进,取得了良好的效果。     

板簧式连铸机结晶器振动机构误差分析

通过对板簧式结晶器振动机构的误差分析,指出了影响振动机构轨迹误差的主要因素.     

连铸机结晶器振动机构动力学

本文以某钢厂连铸机结晶器振动机构为研究对象,通过建立集中参数混合系统动力学分析模型,采用QR方法对系统模态参数-固有频率及振型作了数值求解计算,并采用系统仿真方法计算了机构的振动响应。为确保分析结果的准确性,利用有限元结构分析程序SAP6,通过建立机构动力有限元模型,对系统的模态参数作了进一步的分析计算。本文分析计算结果将为某钢厂现有连铸机结晶器振动频率的提高及设计新的高频振动机构提供重要依据。     

现代板坯连铸机中结晶器液压振动装置

简要介绍板坯连铸机中结晶器液压振动装置的作用、内部组成及其各组成部分的功能。     

攀钢板坯连铸机结晶器振动系统的改进

分析了攀钢１３５０板坯连铸机结晶器振动系统的稳定性和可靠性,根据存在的问题,对结晶器振动系统进行了高拉速连铸。     

结晶器振动双机互备份控制系统

介绍连铸生产中结晶器振动控制系统的组成原理，提出双机互备份并行工作方案，以确保连铸核心装置部分的连续性与稳定性。实际运行表明，该系统工作稳定，有效地提高了连铸生产的可靠性。     

Study on cascaded whole-leaf spring oscillation mechanism for mould in continuous casting

Abstract

A design method of a cascaded whole-leaf spring mechanism is proposed, which is a new oscillation guidance device for the mould in continuous casting. Then its prototype designed in this paper is produced in the lab, of which kinematics and dynamics simulations are carried out based on the rigid–flexible coupling virtual model. Simulation curves of the displacement and velocity of the mould are almost consistent with the ideal ones, which verifies the model built in this paper is rational. Furthermore, natural frequencies and mode shapes of the mechanism are calculated by dynamics simulation, and forces applied on leaf springs and revolute joints are analysed and effects of the basic parameters on these forces are also studied, which establish the basis for further studies and next application of this mechanism.     

弧型小方坯连铸机用结晶器

本文论述了各种弧型小方坯连铸机用结晶器的结构特点和工艺要求，比较了各种结构的优缺点。还介绍了新的喷淋式结晶器的结构及优缺点。     

CSP连铸机大型液压缸的故障分析与改进

论述引进德国SMS连铸机大包托臂液压缸存在的寿命短问题，分析设计制造缺陷．通过增大缸头密封支持面、(φ600)内圆孔倒角、再增加一道软支撑环、缸头导向部分开润滑槽、改进球杆的润滑流道、柱塞杆整体淬火等措施，消除了原来的问题．同时分析了此项改进的技术经济效果．     

结晶器便携式振动监测系统的设计与应用

根据炼钢连铸结晶器的特点,设计并实现了结晶器便携式振动监测系统。采用附加测试件方法消除结晶器表面对信号的影响,提高原始信号质量;通过自适应放大及带通滤波进一步消除干扰信号,提高A／D量化精度;采用多通道同步采样,确保各通道无相移。系统软件具有数据采集与管理、采样组态、测点定义与管理、时域波形显示、波形放大、历史波形回放、历史波形比较、振动相位检测、振动频率检测、报表生成、特征数据采集和振动三维动画显示等功能。     

板坯连铸结晶器调宽控制系统

介绍了攀钢2#板坯连铸机INMO型直结晶器调宽控制系统,对系统的组成、功能、调节原理及实现作了阐述。该调宽系统在稳定的操作状态下控制精度能达到±0.1mm,系统的应用增强了连铸机的适应性,提高了铸机作业率,为攀钢三期工程建设顺利达产提供了保障。     

Looking into continuous casting mould

Abstract

When you look into the continuous casting mould you can see very little. Consequently, steelmakers have had to rely on plant trials, simulation experiments and physical property measurements on fluxes and steels to gain an understanding of the mechanisms responsible for process problems and product defects. However, in recent years, mathematical modelling has advanced to the stage where they can provide us with great insight into these mechanisms. As a non-mathematical modeller, I was initially sceptical of some of the predictions of the mathematical models. However, I have been completely won over by the ability of these models to simulate accurately the mechanisms responsible for various defects, such as slag entrapment, oscillation mark formation, etc. Mathematical modelling literally allows us to ‘see’ what is happening in the mould. It is a remarkable tool.     

板坯连铸结晶器数值模拟

运用Fluent 6.3对板坯连铸结晶器进行数值计算,研究拉速、水口浸入深度及水口开口角度对流场的影响.结果表明:对于断面1400 mm×230 mm结晶器,随拉速增加,液面最大水平和垂直流速均增加,而窄边冲击点的位置基本不变,随距液面距离增加,窄边速度先增加后减小,直至趋向于零;当拉速超过1.2 m.min^-1时,液面水平速度增加明显.随水口浸入深度增加,液面最大水平流速减小,浸入深度超过140 mm时,最大水平流速变化不明显;垂直于液面方向的最大速度逐渐增加;对窄边冲击点影响较小.随水口开口向下角度增加,液面最大水平流速减小后增加,水口开口向下12.5°时液面最大水平流速最小,而水口开口向下10°~12.5°时窄边冲击点速度最小.     

Dynamic pressure in mould flux channel during mould non-sinusoidal oscillation

Abstract

Based on the lubrication theory of mould flux, a mathematical model of dynamic pressure in mould flux channel was developed, and the distribution of dynamic pressure and its variation during non-sinusoidal oscillation were investigated. The effects of casting speed and non-sinusoidal oscillation parameters, including the degree of non-sinusoidal operation (non-sinusoidal factor), amplitude and frequency of oscillation on the dynamic pressure in the mould flux channel, were studied. The results indicate that the maximum negative pressure is decreased, and the maximum positive pressure is increased with increasing non-sinusoidal factor. The optimum value of non-sinusoidal factor is ～0·2. With increasing amplitude and frequency of oscillation, both the negative and positive pressure are increased; moreover, the increment of positive pressure is obviously greater than that of negative pressure; especially when the oscillation frequency is increased, the increment of negative pressure is very little. When the casting speed is enhanced, the negative pressure is increased, but the positive pressure is decreased. Therefore, if the casting speed is increased, the oscillation amplitude needs to be increased, as well as the oscillation frequency needs to be decreased properly. With these adjustments, the positive pressure in mould flux channel is nearly unchanged. The actions of strand demoulding and cracks welding are kept effective. Moreover, the negative pressure in mould flux channel is increased properly, which causes the flux consumption to increase, so the mould lubrication is improved. Finally, the strand surface quality is improved greatly, and breakout can be avoided. The applicability of the optimised non-sinusoidal oscillation parameters for the two kinds of casting speed has been proven by industrial practice.     

Three-dimensional analysis and design of petal-like mould for continuous casting of steels

Abstract

Understanding the shrinkage behaviour of a steel billet is very important for designing the continuous casting mould, and conversely, a well designed mould is beneficial when matching the shrinkage behaviour of the billet. The shrinkage behaviour of a billet is hard to measure in situ during continuous casting but can be calculated by numerical simulation. A three-dimensional finite element model has been built to simulate the thermal and stress fields of the billet in the mould. The dynamic thermal boundary condition, the effect of ferrostatic pressure and the temperature dependent thermophysical parameters have been considered in the model. The shrinkage of billet when considering ferrostatic pressure is on average 0·08 mm smaller than when not considering ferrostatic pressure. The temperature and stress distributions are analysed in the present paper, and based on this analysis, a novel petal-like mould was designed and its taper determined. The designed mould has been tested in industrial practice showing better lifetime and billet quality.