本文選題：超寬冷連軋機 + 板形檢測　； 參考：《北京科技大學》2015年博士論文

【摘要】：冷軋帶鋼是鋼鐵工業(yè)的高端產(chǎn)品之一,廣泛應(yīng)用于汽車、家電、建筑等行業(yè),板形質(zhì)量受到國內(nèi)外冷軋帶鋼生產(chǎn)單位持續(xù)的高度關(guān)注,一直是企業(yè)與科研人員努力提升的重要任務(wù)。以2180mm冷連軋機為代表,可軋寬度超過1800mm的超寬帶鋼冷連軋機的出現(xiàn),為板形問題的研究與控制提出了新的課題。超寬軋機所軋帶鋼表現(xiàn)出的板形缺陷,具有起浪區(qū)域多,板形成分復(fù)雜的特點,雖然有彎輥、竄輥、精細冷卻等豐富的板形控制手段,但依然無法對其進行有效的控制,成為生產(chǎn)中亟待解決的技術(shù)難題。 板形問題分析與控制是板帶軋制領(lǐng)域的前沿問題,涉及彈塑性變形、熱變形、板形檢測及屈曲變形等理論。本文結(jié)合2180mm冷連軋機的生產(chǎn)實際,利用解析分析、數(shù)值仿真、試驗研究等多種手段,對非接觸式板形儀測量準確性及目標曲線、超寬軋機帶鋼板形特征、軋機板形控制能力以及超寬軋機復(fù)雜板形缺陷控制等內(nèi)容進行了研究,主要研究工作及取得的成果如下： (1)建立了帶鋼與氣流間的流場分析、帶鋼受迫振動有限元仿真模型,確定了激振力對板形檢測結(jié)果沿帶鋼寬度方向的影響規(guī)律,給出了板形測量誤差補償量的計算方法；通過帶鋼橫向溫度的測量與分析,給出2180mm冷連軋機溫度應(yīng)力補償量的計算方法,并總結(jié)了相應(yīng)目標曲線的確定方法。針對實物板形缺陷分析問題,提出了板形儀檢測結(jié)果與實物板形的跟蹤統(tǒng)計方法,發(fā)現(xiàn)2180mm冷連軋機板形缺陷形式以邊中復(fù)合浪和中浪為主。 (2)考慮板形儀傳感器布置不均的影響,提出了板形綜合平坦度計算新方法,使具有不同板形儀配置生產(chǎn)線間板形質(zhì)量更具可比性。為解決綜合平坦度指標無法體現(xiàn)具體板形缺陷類別的問題,提出了含三次板形基模式的板形模式識別方法,對超寬軋機的板形缺陷進行了初步分析,所得結(jié)果與實物板形跟蹤結(jié)果相對應(yīng)。為對超寬軋機板形特征進行更深入的分析,利用數(shù)據(jù)挖掘理論,提出了基于網(wǎng)格和密度的板形特征聚類分析方法,采用該方法對2180mm冷連軋機帶鋼板形進行了分析,發(fā)現(xiàn)該軋機帶鋼邊部板形具有顯著的局部特征,并給出了具體函數(shù)表達方法,為冷軋板形問題的分析與研究提供了新的思路與方法。 (3)在借鑒“大數(shù)據(jù)理論”相關(guān)思想的基礎(chǔ)上提出了軋制過程海量工藝參數(shù)的分析方法,對工藝參數(shù)進行分析后明確了2180mm冷連軋機的工作狀態(tài)。結(jié)合生產(chǎn)實際,建立了輥系與軋件一體化的彈塑性有限元模型,對2180mm冷連軋機軋制過程進行了仿真計算,利用凸度調(diào)節(jié)域法和效應(yīng)函數(shù)法對軋機板形調(diào)控能力和控制特性進行了全面分析,揭示了超寬冷連軋機復(fù)雜板形缺陷難以控制的原因在于不具備調(diào)節(jié)效果與板形缺陷特征相似性較高的控制手段,提出了超寬軋機復(fù)雜板形缺缺陷難以控制的分析方法,為超寬軋機的板形控制提供了改進方向。 (4)在對帶鋼板形特征及超寬軋機板形控制能力深入研究的基礎(chǔ)上,提出了適用于超寬軋機的輥形優(yōu)化設(shè)計方法,并針對2180mm冷連軋機對具有突出邊部特征的板形缺陷難以控制的特點,設(shè)計了具有局部邊浪控制能力的變凸度中間輥輥形。對新輥形進行了工業(yè)試驗,取得了較為明顯的邊部板形缺陷控制效果,證明了所提出輥形設(shè)計方法的可行性與有效性。
[Abstract]:Cold - rolled strip steel is one of the high - end products of iron and steel industry . It has been widely used in automobile , household appliances , buildings and other industries . It is an important task for enterprises and researchers to improve .

The analysis and control of the plate - shaped problems is a leading problem in the field of plate - strip rolling , which involves the theory of elastic - plastic deformation , thermal deformation , plate shape detection and buckling deformation . In this paper , the accuracy and the target curve of the non - contact plate - shaped instrument , the shape characteristics of the strip steel plate , the control ability of the rolling mill and the control of the complex plate shape defect of the ultra - wide mill are studied by means of analytical analysis , numerical simulation and experimental research .

( 1 ) The flow field analysis between the strip steel and the air flow is established , the finite element simulation model of the forced vibration of the strip steel is established , the influence law of the exciting force on the plate shape detection result along the width direction of the strip steel is determined , and the calculation method of the compensation amount of the plate shape measurement error is given ;
Based on the measurement and analysis of the transverse temperature of strip steel , the calculation method of temperature stress compensation of 2180mm cold continuous rolling mill is given , and the determination method of the corresponding target curve is summarized . According to the problem of plate shape defect analysis , this paper presents a method of tracking and statistics of the results of plate shape and the shape of physical plate . It is found that the form of plate shape defect of 2180mm cold continuous rolling mill is mainly in the form of composite wave and medium wave in the edge .

( 2 ) In order to solve the problem of plate shape defect classification , a new method of plate shape pattern recognition based on grid and density is proposed for solving the problem of plate shape defect classification .

( 3 ) Based on the idea of " Big Data Theory " , an analysis method of mass process parameters for rolling process is put forward . The working state of 2180mm cold continuous rolling mill is defined after the analysis of process parameters . The rolling process of 2180mm tandem rolling mill is simulated and calculated by means of convexity adjusting domain method and effect function method .

( 4 ) On the basis of the deep research on the strip shape characteristic and the shape control ability of the ultra - wide rolling mill , a roll shape optimization design method suitable for the ultra - wide rolling mill is put forward , and the variable - crown intermediate roll shape with local edge wave control capability is designed aiming at the characteristics of difficult control of the plate shape defect with the characteristic of the protruding edge part of the 2180mm cold continuous rolling mill . The new roll shape is industrially tested , and the obvious edge - shape defect control effect is obtained , and the feasibility and the validity of the proposed roll - shaped design method are proved .

【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TG335.12

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