Prediction of Casting Roller Wear During the Solidification End Reduction of Continuous Casting Bloom
摘要
The solidification end reduction technique in the continuous casting process can markedly enhance the internal quality of the bloom. Nevertheless, with an escalation in the reduction amount, the contact area of the roller-bloom expands, intensifying the concentration of contact stress on the casting roller. This exacerbates the wear on the casting roller, thereby diminishing its service life. In this work, grounded in Archard theory, a thermal-mechanical-wear model for the continuous casting reduction involving roller-bloom contact was developed. The temperature, contact stress, and wear depth of the casting roll were computed and validated across various reductions and distinct reduction positions at the culmination of continuous casting solidification, utilizing field industry data. The findings indicate a linear increase in wear depth with the reduction in the continuous casting process, reaching approximately twice the amount of normal wear after a 5 pct reduction is applied. Under identical reduction conditions, wear near the corner of the casting roll is more severe due to lower temperatures, with the corner area experiencing wear approximately two to three times higher than the normal wear area. It is suggested that employing a convex roller structure can mitigate the impact of lower corner temperatures and larger stress areas, effectively reducing wear on the casting roller and enhancing its service life. Furthermore, the greater the distance of the reduction position from the meniscus, the more pronounced the wear becomes. Specifically, for every 50 °C decrease in continuous casting bloom temperature, wear depth increases by approximately 3.7 pct.