方坯结晶器铜管圆角的优化实践

Optimization practice of corner radius of billet mold

研究了方坯结晶器圆角的大小对铸坯角部导热,初生坯壳的生长以及角部质量的影响。结果表明：断面160 mm×160 mm的结晶器圆角由R8mm改为R12mm,角部裂纹概率由63.6%提高到85.8%,但铸坯拉坯阻力变大;断面220 mm×260 mm的结晶器圆角由R8mm为R20偏大,角部裂纹概率由89.9%提高到98.1%,但铸坯外形质量变差,最终选择R_（15）较为合适。

The effects of corner radius on the thermal conductivity of the billet,growth of the primary shell and corner quality were studied. It showsthatcornerradiusof 160 mm×160 mm cross section arechanged from R8 mm to R12 mm,the probability of corner crack increases from 63.6% to 85.8%,but the resistance of casting slab becomes larger. Corner radius of Section 220 mm × 260 mm changed from R8 mm for the R12 mm is too large,the corner of the crack probability increased from 89.9% to 98.1%,butthedeteriorationof slab shapeappears,so R15 mm is more appropriate.