基于相关性及主成分分析的铸坯质量缺陷成因追溯方法  

Traceability method of quality defects causes in continuous casting slab based on correlation and principal component analysis

作　　者：从俊强 付祥元 徐李军[2] CONG Junqiang;FU Xiangyuan;XU Lijun(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,China;National Engineering Research Center of Continuous Casting Technology,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]钢铁研究总院有限公司连铸技术国家工程研究中心,北京100081

出　　处：《冶金自动化》2024年第6期48-56,共9页Metallurgical Industry Automation

基　　金：国家自然科学基金青年科学基金项目(52204330)。

摘　　要：在线追溯铸坯质量缺陷形成原因,对提升缺陷解决效率具有重要作用。传统离线追溯方法具有一定滞后性,已无法满足在线监控需求。以板坯纵裂纹为研究对象,解析了纵裂纹影响因素,构建了连铸过程大数据集成平台,分别采用相关性及主成分分析方法,建立了适用于不同应用场景的铸坯质量缺陷成因追溯模型。针对某钢厂产生的Q235B板坯纵裂纹,相关性分析结果表明,结晶器窄左宽内热流比及钢水过热度影响较大,影响权重分别为-0.28、0.15;主成分分析结果表明,钢水过热度与结晶器窄左宽外热流比是影响纵裂纹的主要影响因素。基于追溯结果检查分析发现,结晶器冷却水水质不合格导致冷却不均匀,造成纵裂纹频发。铸坯质量缺陷成因追溯方法成功在线应用,降低了缺陷再发生率,对实现智能化连铸具有重要意义。Online tracing of the causes of quality defects in continuous casting slab plays an important role in improving the efficiency of defect resolution.The traditional offline traceability method has a certain lag and can no longer meet the needs of online monitoring.Taking longitudinal cracks in slab as the research object,the influencing factors of longitudinal cracks were analyzed,and a big data integration platform for continuous casting process was constructed.Correlation analysis and principal component analysis methods were used to establish traceability models for the causes of quality defects in slab suitable for different application scenarios.Regarding the longitudinal cracks in Q235B slab produced by a certain steel plant,the correlation analysis results show that the narrow left wide internal heat flux ratio of the mold and the superheat degree of the molten steel have a significant impact,with influence weights of-0.28 and 0.15,respectively.The results of principal component analysis indicate that the superheat of molten steel and the ratio of narrow left wide external heat flux in the mold are the main influencing factors on longitudinal cracks.Based on the analysis of the traceability results,it was found that the cooling water quality of the mold was not qualified,resulting in uneven cooling and frequent longitudinal cracks.The successful online application of the method for tracing the causes of quality defects in continuous casting slab has reduced the recurrence rate of defects,which is of great significance for achieving intelligent continuous casting.

关 键 词：连铸 纵裂纹 追溯 智能化 相关性分析 主成分分析 

分 类 号：TF777[冶金工程—钢铁冶金]