连铸坯与结晶器铜板粘结的形成、传播和修复机制及防控方法

Sticker between continuous casting slab and mould is one of the key factors which restrict the development of high speed continuous casting and wide and heavy plate continuous casting technology. Prevention, monitoring and control of the sticker are of great significance for ensuring smooth production and high quality slabs, optimizing continuous casting process. In this project, slab sticker behavior will be systematically studied as the main line. Firstly, based on basic theory of continuous casting, sticker formation, propagation and recovery models are established by combining with mechanical behavior of solidified shell, etc. And the models are verified and optimized by measured data of many stickers. It tries to make complete description and accurate parsing for sticker behavior from the double angles of online measurement and sticker’s models, and to reveal sticker formation, propagation and recovery mechanisms, and further to clarify and quantify the main factors influencing sticker behavior and law of action. On this basis, the criterion and prediction method of sticker formation are established, and the judgment method of sticker propagation behavior is improved, and dynamic sticking alarm control strategy is put forward. Finally, a complete and effective prevention and control method system with strong operability is formed. The results of this study will further deepen the understanding on formation, propagation and recovery behavior of slab sticker, which can provide theoretical basis and technical support for scientific regulation of mould metallurgical process.

连铸坯与结晶器铜板的粘结是制约高拉速连铸和宽厚板连铸技术发展的关键因素之一，预防和监控粘结对保证连铸生产顺行、生产高质量铸坯和优化连铸工艺具有重要意义。本项目拟开展以铸坯粘结行为为主线的系统研究，从连铸基础理论出发，结合凝固坯壳的力学行为等方面，构建粘结形成、传播和修复模型，并基于粘结实例的实测数据进行验证和优化；试图从联合在线实测和粘结模型的双重角度对粘结行为进行完整表述和准确解析，揭示粘结形成、传播和修复机制，厘清并量化影响粘结行为的主要因素和作用规律；以此为基础，确立粘结产生的判据和预测方法，完善粘结传播行为的判定方法，提出动态粘结报警控制策略，最终形成可操作性强、完整有效的粘结防控方法体系。研究结果将进一步深化对铸坯粘结形成、传播和修复行为的认识，为结晶器冶金过程的科学调控提供理论基础和技术支撑。

连铸坯与结晶器铜板的粘结是制约高拉速连铸和宽厚板连铸技术发展的关键因素之一，预防和监控粘结对保证连铸生产顺行、生产高质量铸坯和优化连铸工艺具有重要意义。本项目围绕连铸坯的粘结行为，从其形成、传播、修复机制和判定方法等方面进行了研究。结果如下：.（1）基于初生凝固坯壳受力特点，构建了坯壳粘结形成撕裂模型，得到了粘结形成判据，分析了坯壳粘结形成机理和内在因素。并基于大量粘结实例，统计分析了工艺因素对粘结发生的影响规律，探讨了诱发实际坯壳粘结的可能原因。.（2）提出了描述粘结传播行为特征参数及其计算方法，构建了粘结传播模型。并基于粘结样本的实测数据，通过粘结传播模型定量分析了其关键特征参数和V形裂口传播过程。发现了粘结纵向传播速度小于拉速，与拉速呈线性正相关，横向传播速度存在较大不稳定性等重要规律。.（3）通过分析结晶器出口凝固坯壳受力特点，提出了结晶器出口安全坯壳厚度计算方法。基于粘结修复基础理论，构建了粘结修复模型并通过实例验证，并进一步推导了不同情况下的粘结修复参数，提出了动态粘结报警控制策略。同时分析了粘结修复的影响因素和作用规律，发现粘结点位置、拉速和振动频率对粘结修复的最小拉速影响较大，而振动行程影响较小。.（4）提出了一种识别粘结传播行为的新逻辑判断算法，对其真报警、热电偶温度波动较大的误报、热电偶故障和模型参数调整等情况进行了深入研究，实例仿真显示该算法具有较好预报性能和报警时效性、鲁棒性。同时，采用GA-BP神经网络和逻辑规则建立了一种粘结预报混合方法，实例仿真显示，GA-BP神经网络能很好的识别单偶粘结温度波形模式，混合方法在预报性能上优于新逻辑判断算法，但报警时效性较差。.以上研究成果可形成较完善的粘结防控方法体系，为结晶器冶金过程的科学调控提供了重要的理论基础和技术支撑，对实现先进的结晶器“透明化”和“智能化”控制具有十分重要的意义。