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均匀(见图11)。 一Corvex -Coiwerimdrold Convertoral mol 00 a) (b) 001 00020406 0.0010203 Thckness of证grm Thicknessofargap/mm 图10新型曲面结晶器与传统线性锥度结晶器角部区域气隙洛贪度方向分布 Fig.10 Distribution of air gap at the comer region for new convex surface mold and conventional mold along the mold length (a)wide face,(b)narrow face 120 110 100 90 80 70 60 580 600 20640 Distance from wide face centerline/mm 型曲面结晶器与传统结晶器出口凝固坯壳生长情况 Fig.11 The comparison of solidified shell thickness at the exit between the new and conventional mold 2.2连铸保护渣 结晶器保护渣保障了凝固坯壳与铜板之间有效润滑,但随着拉速的提高,可以发现保 护渣的消耗量降低(如图12所示2]),渣膜厚度变薄,凝固坯壳与结晶器铜壁间的润滑情 况变得越来越不理想,引发裂纹和黏结漏钢风险不断加大。凝固坯壳与结晶器铜板间的液 体摩擦力,可用下式表示: f=nk-a 60d (1) 式中,.为连铸拉速,m'min;ym为结晶器振动速度,mmin;n为保护渣黏度,Pas;山 为保护渣液渣膜厚度(mm),可由下式确定1:均匀(见图 11)。 0.0 0.2 0.4 0.6 0 200 400 600 800 Thickness of air gap/mm Distancefrommeniscus/mm Convex surface mold Conventional mold 0.0 0.1 0.2 0.3 0 200 400 600 800 Thickness of air gap/mm Distancefrommeniscus/mm Convex surface mold Conventional mold 图 10 新型曲面结晶器与传统线性锥度结晶器角部区域气隙沿高度方向分布 Fig. 10 Distribution of air gap at the corner region for new convex surface mold and conventional mold along the mold length (a) wide face, (b) narrow face 540 560 580 600 620 640 40 50 60 70 80 90 100 110 120 Distance fromnarrowface centerline/mm Distance from wide face centerline/mm Convex surface mold Conventional mold 图 11 新型曲面结晶器与传统结晶器出口凝固坯壳生长情况 Fig.11 The comparison of solidified shell thickness at the exit between the new and conventional mold 2.2 连铸保护渣 结晶器保护渣保障了凝固坯壳与铜板之间有效润滑,但随着拉速的提高,可以发现保 护渣的消耗量降低(如图 12 所示[12]),渣膜厚度变薄,凝固坯壳与结晶器铜壁间的润滑情 况变得越来越不理想,引发裂纹和黏结漏钢风险不断加大。凝固坯壳与结晶器铜板间的液 体摩擦力,可用下式表示: c m 60 l v v f d    (1) 式中, vc为连铸拉速,m·min-1;vm为结晶器振动速度,m·min-1;η 为保护渣黏度,Pa·s;dl 为保护渣液渣膜厚度(mm),可由下式确定[13]: (a) (b) 录用稿件,非最终出版稿
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