熱軋製程高速傾輥控制技術開發

Development of Auto-leveling Control Technology in Hot Strip Mill

鄭恆星(H. H. Cheng) ； 何秋誼(C. Y. Hor) ； 劉昀儒(Y. J. Liu)

《鑛冶：中國鑛冶工程學會會刊》 63卷4期 (2019/12) Pp. 79-89

https://doi.org/10.30069/MM.201912_63(4).07

摘要

隨著用鋼需求不斷往高強度與寬薄化發展，如汽車用鋼與耐候鋼，對熱軋製程能否穩定生產的挑戰愈趨嚴苛，其中拋鋼甩尾（Tail pinch）就是關鍵問題。由於硬薄板軋延力大且軋速快，鋼帶尾段脫離軋機時容易瞬間側偏而撞擊軋輥，導致鋼帶缺陷與軋輥受損，需停機換輥，對生產效率影響大。本研究克服軋機高溫高水氣的嚴苛環境，透過曝光控制、邊緣偵測、適應濾波與影像品質自偵測等影像處理技術，開發出高速高解析度的鋼帶側移量測技術，並針對鋼帶側移現象，推導非對稱軋延的數學模式，同時整合側移與軋機兩側軋延力量測，開發混合型高速動態傾輥控制技術。經實測驗證可有效修正鋼帶尾板側偏，改善Tail pinch發生率，對生產效率與品質提升有顯著效益。更重要的是，唯有製程能穩定生產高質化產品，才能真正提升鋼廠與用鋼產業的競爭力。

關鍵字

汽車用鋼 ； 高強度鋼 ； 拋鋼甩尾 ； 傾輥控制

並列摘要

As the demand for steel continues to increase in strength and width, such as automotive steel and weathering steel, the challenge of stability in hot strip mill is becoming more rigorous. Tail pinch occurred in finishing mill is one of the important issue. Due to the large rolling force of the hard and thin strip and the high rolling speed, the tail of the steel strip is easy to lateral move and hit the work roll when the tail end passed through the previous mill, which causes the steel strip defect and the roll surface to be damaged. It is necessary to stop rolling and change the work roll, which has a great influence on the production efficiency. Therefore, tail pinch has always been the bottleneck for the production of high-grade products in hot strip mill. In this research, a high-speed and high-resolution side walk measurement technology for steel strip was developed by using of the image processing techniques such as exposure control, edge detection, adaptive filtering and image quality self-detection. For the rolling phenomenon of lateral movement in strip tail end, the transfer function of asymmetric rolling was derived and the side walk and the differential force on both sides of the rolling mill were integrated to develop an automatic roll leveling control technology. The results of auto-leveling control demonstrated that the lateral movement of the strip tail could be effectively corrected. The occurrence rate of tail pinch could be greatly reduced which significantly improves production efficiency and quality. More importantly, only when the high-quality steel products can be manufactured stably, it is possible to enhance the competitiveness of steel industries.

並列關鍵字

Automotive steel ； High strength steel ； Tail pinch ； Auto-leveling control