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題 名 | 鋼板熱軋製程的冷卻溫度預估 |
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作 者 | 傅武雄; 游政義; | 書刊名 | 力學 |
卷 期 | 10:4 1994.12[民83.12] |
頁 次 | 頁263-273 |
分類號 | 472.3 |
關鍵詞 | 相變化; 製程熱傳; 層流冷卻; Phase change; Manufacturing process; Laminar colling; |
語 文 | 中文(Chinese) |
中文摘要 | 本文採用數值方法探討層流冷卻、空氣對流、輻射熱傳和輸送檯滾輪熱傳導等熱 傳機構對熱軋鋼板冷卻的影響外, 並配以 TTT 圖(恆溫冷卻變態圖)模擬鋼板的連續冷卻 變態現象,以求精確預估盤捲溫度,並確保鋼材品質。 對於變態開始之判斷,是依據分散性核生成時間的概念,求出變態的過冷卻與變態開始所需 潛伏期間的關係, 累積每一段時間間距的變態潛伏期,直至開始變態,再利用 TTT 圖作變 態計算。結果顯示,在考慮滾輪熱傳導時,可將鋼板所接觸之每個滾輪視為一維(徑向)以 簡化計算,而滾輪與鋼板接觸不可視為完全接觸,必需考慮到接觸熱阻的存在。此外,不考 慮鋼鐵變態所預估出來之盤捲溫度與日本鐵鋼協會量測值之比較,在完全變態的情況下,對 於 8.82mm 之 1021 號厚鋼板高達 125 ℃, 對於 2mm 之 1021 號薄鋼板則高達 163 ℃。 而本文計算之盤捲溫度與日本鐵鋼協會量測值之比較, 對 8.82mm 之 1021 號厚鋼板僅有 5.8 ℃之差距,對 2mm 之 1021 號薄鋼板則僅有 9.7 ℃之差距。 |
英文摘要 | This numerical study is to investigate the laminar flow cooling air convection, radiation heat transfer and the contact conduction heat transfer of the rollers of the run-out table on steel strip cooling during hot rolling process. The study simulates the continuous cooling transformation phnomenon of steel strip by using a TTT-diagram (Isothermal transformation diagram) so as to predict strip coiler temperature exactly and obtain a high quality material. The relation between transformation subcooling and the incubation period of starting transformation is found in accordance with the idea of dispersive nucleate formation, and the strip transformation can be calculated with TTT-diagram when transformation happens. The results reveal that we can simplify calculation by using one dimension rollerrs of runout table contacting with steel strip, and the contact of rollers and steel strip cannot be treated as complete contact for the existance of thermal contact resistance. Besides, under complete transformation the coiler temperature difference between numerical calculation without considering steel transformation and measurement from ISIJ report is 125 ℃ for 1021 carbon steel strip with 8.82 mm thickness, and 163 ℃ for that with 2 mm thickness. The coiler temperature difference between numerical calculation of this study and measurement from ISIJ report is only 5.8 ℃ for 1021 carbon steel strip with 8.82 mm thickness, and is 9.7 ℃ for that with 2 mm thickness. |
本系統中英文摘要資訊取自各篇刊載內容。