連鑄模內鋼液固化熱傳程序之研究

Study of Heat Transfer Process during Solidification in a Continuous Casting Mold

黃和全(H. C. Huang) ； 張永輝(Y. H. Chung) ； 林冠儒(K. J. Lin)

《鑛冶：中國鑛冶工程學會會刊》 35卷2期 (1991/06) Pp. 134-141

https://doi.org/10.30069/MM.199106_35(2).0015

摘要

鑄模內初期凝固殼的熱傳控制，是影響鑄胚的表面品質，以及連鑄的順利操作生產的主因之一。本文利用一個熱傳阻力串聯的模式，來解析初期凝殼的固化熱傳行為，以探討各層的熱傳阻力，凝殼厚度的成長和溫度分佈，以及銅模板熱拔量等重要製程變數。熱傳固化模式是利用IAD有限差分法求得數值解，並配合實驗數據的量測，例如爆湯殼厚度分佈，銅模板溫度變化，以及鑄模冷却水的熱傳總量等，來驗正模式計算值的準確性，實驗值與計算值的比較，其誤差皆落於合理的範圍以内。利用此一熱傳固化模式，可以得到操作變數如澆鑄速度，過熱溫度等，對於製程控制的影響關係，以作為改善連鑄作業的依據。

並列摘要

Proper control of heat transfer rate for solidifying shell greatly influences surface quality of slab and smooth casting operation. The present work has adopted a model of heat resistance in series to analyze numerically the silidification heat transfer process in mold. Its objective is to investigate the process parameters such as heat transfer resistance, the growth of solidifying shell, temperature of mold and heat extraction of cooling water in mold. The mathematical model is based on the IAD finite differential method to seek a numerical solution. The calculated results are agreeable with the experiment ones such as shell profiles, temperature of mold and total heat extraction rate of cooling water. The model has enabled us to get comprehensive information of the casting mold region with varying operating states. It can also be utilized as a potential simulator to determine optimum casting conditions.