Analysis on Multi-taper Billet Mould
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摘要: 基于坯壳应力遗传特性建立铸坯热力耦合模型,利用ANSYS对结晶器内铸坯进行铸坯传热及应力分析。依据最小气隙原则对结晶器锥度进行优化,分析了单锥度和多锥度对坯壳凝固行为的影响。结果表明:采用两种锥度形式的结晶器,铸坯角部凝固行为存在明显差异,而表面中心区域基本一致。单锥度结晶器内气隙分布较广,角部热流明显降低,在偏离角部12~22 mm处存在“热点”。多锥度结晶器内气隙宽度和存在范围显著减少,“热点”消失,多锥度结晶器更符合坯壳凝固收缩规律。Abstract: Based on stress inheriting characteristic of the billet shell in continuous casting,a thermo-mechanical coupling model of billet is established.Heat transfer and stress fields of the billet in the mould is analyzed by the finite element software ANSYS.The mould taper is optimized according to principle of minimum air gap and the influence of single-taper and multi-taper on solidification behavior of the billet shell in the mould is analyzed.The results show that under these two tapers,the solidification behaviors are obviously different in the corner area of the billet but basically the same in the central area.In the single-taper mould,the air gap spreads widely and heat flow remarkably reduces in the corner area;"hot spots" appear at the area around 12~22 mm away from the corner.In the multi-taper mould,the width and distribution of air gap significantly decrease and there are no "hot spots" in existence,which demonstrates multi-taper mould is more consistent with the solidification shrinkage law of the billet shell.
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Key words:
- multi-taper mould /
- thermo-mechanical coupling /
- air gap /
- inheriting stress
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