连铸保护渣液/固非均匀润滑及瞬态摩擦机制研究

项目名称： 连铸保护渣液/固非均匀润滑及瞬态摩擦机制研究

项目编号： No.51474047

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 王旭东

作者单位： 大连理工大学

项目金额： 80万元

中文摘要： 保护渣是坯壳和结晶器交互作用的纽带，也是传递导热、润滑等功能的桥梁，揭示保护渣液/固摩擦的分布、演化与控制规律，对于初生坯壳的质量调控极为关键。本项目拟在润滑/摩擦反问题和瞬态摩擦力实证研究的基础上，系统探索液/固渣膜润滑与摩擦的非均匀特征，研究其与保护渣理化性能间的内在关联和影响规律。进一步考虑结晶器振动与渣膜润滑的动态行为，构建保护渣流动/摩擦反问题数值模型，借助从实测摩擦力中提取的液/固摩擦分量，逆推并反演渣膜运动、渣道动态压力和液/固摩擦的周期变化，探讨结晶器振动对液/固摩擦瞬态演化的影响与作用机制。通过整合反问题解析与瞬态摩擦实证研究结论，厘清支配润滑与诱发裂纹的主要因素，探索非均匀与周期摩擦双重作用下，表面裂纹形成的典型特征、极限条件和一般规律。研究结论可望深化对保护渣液/固摩擦行为的理解和认识，为其性能调控提供实验基础和理论依据。

中文关键词： 保护渣；液/固摩擦；非均匀；瞬态行为；结晶器

英文摘要： Mold flux is the interaction link between shell and mold, and also the transmission bridge for heat transfer and lubrication functions. Scientifically comprehending about the distribution and evolution of mold flux has a significant effect on quality control for initial solidified shell. Based on the research of inverse lubrication/friction problem and experimental measurements of transient friction, this project is supposed to explore the non-uniformity of liquid/solid lubrication, and investigate the inherence relationship between non-uniformity friction and thermo physical properties of mold flux. Furthermore, considering the dynamic behavior of mold oscillation and lubrication, the inverse model coupled flow and friction behavior of mold flux is going to be built. Through separating the components of liquid and solid friction from total measured friction, the periodical change of flux flow, channel pressure and liquid / solid friction are to be inversely deduced, and the action mechanism of mold oscillation on the liquid/solid transient friction is also studied. Finally, the research conclusions of inverse calculation and experimental measurements will be integrated to disclose the dominant elements over lubrication and surface cracks. In view of the multiple actions of non-uniformity and periodical friction, this project is to explore the typical characters, critical conditions and general rules during formation of surface cracks. The results will further enhance comprehension of complex friction behavior, and establish experimental and theoretical foundation for lubrication regulation of mold flux.

英文关键词： mold flux;liquid / solid friction;non-uniformity;transient behavior;continuous casting mold