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題 名 | 雙輥輪薄片連鑄的流動及熱傳模擬=Numerical Simulation of Metal Flow and Heat Transfer during Twin Roll Strip Casting |
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作 者 | 黃振東; 林惠娟; 黃文星; 胡塵滌; | 書刊名 | 鑄工 |
卷 期 | 23:2=93 1997.06[民86.06] |
頁 次 | 頁22-32 |
分類號 | 472.2 |
關鍵詞 | 雙輥輪薄片; 連鑄; |
語 文 | 中文(Chinese) |
中文摘要 | 在隻輥輪薄片連鑄過程中,如何起注是該製程所遭遇的問題之一。在澆注初期, 兩輥輪間的鋼液池 (metal pool) 應逐漸上升至適當的高度,同時沿兩輥輪表面成長的凝固 層,在其離開輥輪最小間隙前應該相互接合在一起, 此時導引片 (dummy sheet) 才可開始 引拔。如果引拔的時機不對,將導致製程及產品的不穩定,同時易使板片斷裂,這將不利於 鑄造薄板片的後續線上捲起。因此導引片的引拔時機對雙輥輪薄片連鑄的起注階段相當重要 。但是正確的引拔時機與鋼液池內的熱傳、流動及鋼液輥輪間的相互作用有密切關係。為了 瞭解薄片連鑄製程中鋼液池內的基本輸送現象, 本研究利用一熱流分析軟體 Pro CAST,來 模擬其起注階段的流動、熱傳和凝固行為。該製程所涉及到的流動及能量微分方程式係用有 限元素法 (FEM) 來求解; 而鋼液池自由表面狀況則用 VOF (Volume of Fluids) 方法來處 理;凝固過程中有關潛熱的釋出則用熱焓法來處理。採用本數學模式的優點在於其能處理複 雜曲面、移動邊界 (轉動輥輪 ) 及流體自由表面的能力。 藉由本套數學模式,便可模擬實 際薄片連鑄製程中,鋼液池內的金屬液充填過程及其溫度的變化。由模擬結果可瞭解到鋼液 池的發展及凝固層厚度隨時間變化的過程。同時,鋼液池的高度、凝固界面移動狀況及最後 凝固位置亦可得到。根據這些模擬所得的資訊,便可決定導引片較適當的引拔時機。 |
英文摘要 | In order to elucidate the fundamental transport phenomena in twin-roll strip casting, a commerical software called ProCAST was employed to simulate the transient fluid flow, heat transfer and solidification bahaviors during the early stage of the process in this study. The coupled set of governing differential equations for mass, momentum and energy balance were solved with the finite element method and the transient free surface problem was treated with a Volume of Fluids (VOF) approach. An enthalpy method was empolyed to handle the phase change during solidification. The advantage of this model is the great capability to treat the problems of moving boundary and free surface of fluid. With this mathematical model, the filling sequences, flow patterns and corresponding temperature profiles in the metal pool under an actual casting condition of a vertical twin-roll strip casting process were simulated in this study. From the calculated results, how the metal pool progressively develops between the rolls and how the solidified layer grows in thickness with time on the rotating rolls are possibly revealed. Moreover, the metal pool level, the solidification as well as the end position of solidification front. could be obtained. With these available informations, the optimal withdrawal time of the strip casting process can be thoughtfully determined. |
本系統中英文摘要資訊取自各篇刊載內容。