Correlation between longitudinal crack occurrence and mold heat transfer in continuous casting based on process data mining

The correlation between the longitudinal crack occurrence and integrated heat transfer of the mold with data mining methods was investigated. Firstly, three kinds of support vector machine models based on principal component analysis with different input features were established to explore the effect of integrated heat transfer on the accuracy of the prediction model for the longitudinal crack. The results show that the accuracy was improved while features including mean and standard deviation of integrated heat transfer were added. Then, the difference in integrated heat transfer between defect and normal samples under the same process parameters was quantitatively compared. Compared with normal samples, the temperature difference of cooling water for defect samples decreased by 0.65%, and the temperature difference fluctuation increased by 31.1%. Finally, the literature data were used to provide support for the quantitative correlation according to defect formation mechanism. A new criterion for the prediction of longitudinal crack and a discovering method for correlation between product quality and process parameters in the manufacturing industry have been provided.