【摘要】：板形理論與控制技術(shù)的研究是板帶軋制領(lǐng)域中的熱點課題,一直以來備受研究人員及生產(chǎn)企業(yè)的高度關(guān)注。目前,對稱板形控制技術(shù)的研究已相對成熟,而由于存在著復(fù)雜的產(chǎn)生機理,且包含大量非線性與耦合關(guān)系的影響,非對稱板形控制技術(shù)的研究卻相對不足,使得長期以來沒有開發(fā)出有效的在線控制策略與控制模型,生產(chǎn)過程只能依賴人工干預(yù),導(dǎo)致控制精度不足且易于產(chǎn)生板形質(zhì)量問題,嚴重影響了帶鋼的成品質(zhì)量。本文以某2250mm常規(guī)熱連軋粗軋機組為研究對象,針對熱軋粗軋區(qū)板坯非對稱板形問題,建立了基于多種數(shù)值計算方法的粗軋板坯鐮刀彎綜合調(diào)平設(shè)定模型。論文取得了如下研究成果： (1)建立了出口板坯鐮刀彎彎曲量計算公式。通過建立軋輥-軋件動態(tài)熱力耦合有限元模型,從來料和設(shè)備兩方面考慮,分析了粗軋出口板坯非對稱板形的產(chǎn)生機理,并驗證了該計算公式的準(zhǔn)確性,為實現(xiàn)粗軋板坯鐮刀彎調(diào)平設(shè)定模型提供了理論基礎(chǔ)。 (2)建立了基于兩側(cè)軋制力差的鐮刀彎調(diào)平計算模型。通過彈跳方程與有限元方法相結(jié)合,針對引起板坯鐮刀彎的主要因素——軋機兩側(cè)縱向剛度偏差、來料楔形及走偏分別計算對應(yīng)的調(diào)整量,結(jié)合鐮刀彎彎曲量公式,計算出粗軋機各道次的輥縫傾斜調(diào)整值。該模型具有完備的理論基礎(chǔ),是適應(yīng)于粗軋機各道次的有效調(diào)整方法。 (3)建立了基于中心線偏移量的鐮刀彎調(diào)平計算模型。通過測寬儀實測中心線偏移量數(shù)據(jù)解析板坯鐮刀彎信息,并轉(zhuǎn)化為板坯兩側(cè)厚度差,進而求解出輥縫傾斜調(diào)整值。模型中引入橫向流動因子定義,并結(jié)合有限元方法,有效保證了針對不同工況的適應(yīng)性。該模型能夠基于鐮刀彎實測數(shù)據(jù)實現(xiàn)粗軋機第1道次和偶數(shù)道次的有效調(diào)整。 (4)提出了綜合兩種調(diào)平計算模型的控制策略,建立了基于RBF神經(jīng)網(wǎng)絡(luò)的鐮刀彎綜合調(diào)平預(yù)報模型和在線自學(xué)習(xí),優(yōu)化各道次輥縫傾斜調(diào)整值的修正系數(shù),能夠通過實測軋制數(shù)據(jù)不斷提高鐮刀彎調(diào)平模型設(shè)定精度,形成了具有自動優(yōu)化能力的完整鐮刀彎控制體系。鐮刀彎調(diào)平設(shè)定模型自投入實驗運行后,中間坯鐮刀彎彎曲量未達標(biāo)率從24.88%下降到6.62%,表明該模型有效地控制了粗軋中間坯鐮刀彎問題,提高了鐮刀彎控制水平。
[Abstract]:The research of flatness theory and control technology is a hot topic in the field of strip rolling, and has been highly concerned by researchers and production enterprises. At present, the research of symmetrical shape control technology has been relatively mature, but the research of asymmetric shape control technology is relatively insufficient due to the existence of complex production mechanism and the influence of a large number of nonlinear and coupling relations. For a long time, there is no effective on-line control strategy and control model, and the production process can only rely on manual intervention, which leads to the lack of control precision and easy to produce shape quality problems, which seriously affects the quality of the finished steel strip. In this paper, aiming at the problem of asymmetric slab shape in the rough-rolled area of 2250mm, a comprehensive leveling model for sickle bending of rough-rolled slab is established based on various numerical calculation methods. The main results are as follows: (1) the calculation formula of bending quantity of sickle for export slab is established. By establishing the dynamic thermo-mechanical coupling finite element model of roll and workpiece, considering the material and equipment, the mechanism of asymmetric slab shape at the outlet of rough rolling is analyzed, and the accuracy of the calculation formula is verified. This paper provides a theoretical basis for the setting model of sickle bending leveling for rough rolling slab. (2) the calculation model of sickle bending leveling based on the rolling force difference between two sides is established. Through the combination of spring equation and finite element method, aiming at the main factors that cause slab sickle bending, such as longitudinal stiffness deviation of both sides of rolling mill, feed wedge and walking deviation, the corresponding adjustment amount is calculated respectively, and combined with the formula of sickle bending amount, The roll slant adjustment value of each pass of roughing mill is calculated. This model has a complete theoretical foundation and is an effective adjustment method for each pass of roughing mill. (3) the calculation model of sickle bending leveling based on centerline offset is established. The deflection data of the center line measured by the width meter are used to analyze the bending information of the sickle of the slab, and the thickness difference between the two sides of the slab is transformed into the thickness difference between the two sides of the slab, and then the roll slanting adjustment value is solved. The definition of transverse flow factor and the finite element method are introduced into the model to ensure the adaptability of different working conditions. Based on the measured data of sickle bend, the model can effectively adjust the first pass and even number pass of roughing mill. (4) the control strategy of synthesizing two kinds of leveling calculation models is proposed. A comprehensive leveling prediction model of sickle bending based on RBF neural network and on-line self-learning are established to optimize the correction coefficient of roll slant adjustment value for each pass, which can continuously improve the setting accuracy of sickle bending leveling model through the measured rolling data. A complete sickle bending control system with automatic optimization capability is formed. After the sickle leveling model has been put into operation since the experiment, the bending rate of the sickle is decreased from 24.88% to 6.62%, which indicates that the model can effectively control the bending problem of the sickle and improve the control level of the sickle bending.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TG334.9

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