本文選題：熱連軋機　切入點：寬帶鋼　出處：《北京科技大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：2250mm熱連軋機是目前國內(nèi)寬度最大的“超寬”熱軋中薄板生產(chǎn)線,與1450mm、1700mm等寬帶鋼軋機相比,該軋機的顯著特征是輥徑基本不變,但輥身長度增加了30%-50%,導(dǎo)致輥系橫向剛度明顯下降,軋機力學(xué)行為更加復(fù)雜,并且該軋機的產(chǎn)品規(guī)格也比一般的寬帶鋼軋機復(fù)雜。因此,該軋機在與板形有關(guān)的軋機剛度、輥系受力變形、軋輥磨損和熱脹等方面的非對稱性和局部性特點更加突出。由此而導(dǎo)致實際生產(chǎn)中,帶鋼經(jīng)常出現(xiàn)板廓非對稱、局部高點等缺陷,嚴重影響了產(chǎn)品板形質(zhì)量。 本文以某2250mm熱連軋機為研究對象,將理論分析和數(shù)值計算、實驗研究相結(jié)合,針對超寬帶鋼板廓形狀非對稱和局部高點缺陷的形成和遺傳規(guī)律等進行了深入研究,結(jié)合該熱連軋機生產(chǎn)線的自身特點及板形控制手段對板廓缺陷控制進行了探討和應(yīng)用研究。本文的主要工作和成果如下： (1)根據(jù)大量帶鋼板廓測量分析發(fā)現(xiàn),超寬軋機帶鋼板廓非對稱和局部高點等缺陷的存在,傳統(tǒng)凸度和楔形指標無法準確描述帶鋼板廓形狀,從而導(dǎo)致板形質(zhì)量控制和評價的精度降低。因此,通過研究超寬軋機帶鋼板廓的缺陷特征及其對板形控制的影響,針對性地提出了局部高點參數(shù)識別方法、板廓不對稱度的非對稱指標以及基于局部板廓權(quán)重的帶鋼板廓估計方法,為帶鋼板廓的描述和控制提供了新的思路。 (2)測量并分析了2250mm熱連軋機的軋機和軋件所處的非對稱狀態(tài),并利用非對稱輥系變形模型和遺傳效應(yīng)方法,研究了超寬帶鋼板廓非對稱的形成過程,明確了多種非對稱因素對板廓的影響作用及其在連軋過程中的遺傳規(guī)律。 (3)針對由于超寬熱連軋機軋制計劃復(fù)雜多樣、CVC竄輥特點和帶鋼表面橫向溫度分布特點等引起的工作輥嚴重不均勻磨損,及其對板廓形狀的遺傳特性,提出并實現(xiàn)了基于帶鋼板廓形狀的工作輥不均勻磨損計算模型,為軋輥磨損的在線計算提供了新方法。 (4)利用局部的軋件變形模型,研究了局部高點的形成和演變過程,發(fā)現(xiàn)各機架工作輥局部磨損是造成帶鋼出現(xiàn)局部高點的主要原因,且下游機架工作輥磨損是決定性因素。為改善帶鋼板廓質(zhì)量,進行了高速鋼軋輥在熱連軋機組下游機架的使用研究,結(jié)果表明高速鋼軋輥的使用有效改善了帶鋼板廓形狀。 (5)根據(jù)理論和生產(chǎn)數(shù)據(jù)的分析結(jié)論,提出并實施了軋機剛度、軋件跑偏、軋件橫向溫度分布的調(diào)控標準、高速鋼軋輥的使用規(guī)范以及軋制計劃的調(diào)整等方案,使2250mm熱連軋機板廓缺陷基本得到控制,由板廓缺陷引起的板形質(zhì)量缺陷改判率從2012年的1.2%下降到2014年的0.02%。
[Abstract]:2250mm Hot Strip Mill is currently the largest domestic sheet width "wide" hot rolling production line, and 1450mm, compared to 1700mm wide strip mill, rolling mill is a salient feature of the roll diameter is almost the same, but the length of the roll roll system leads to increased 30%-50%, lateral stiffness decreased, the mechanical behavior of rolling mill is more complicated and the product specifications of the mill than wide strip mill general complex. Therefore, the mill in the flatness and the rigidity of mill, roll system deformation, roll wear and thermal aspects of non symmetry and local characteristics more prominent. Caused by the actual production, often appear in the strip asymmetric profile, local high point defects, seriously affect the product quality of flatness.
This paper takes a 2250mm Hot Rolling Mill as the research object, theoretical analysis and numerical calculation, experimental research combined with ultra wideband plate profile of asymmetric and local high point defect formation and genetic regularity is studied, combined with the hot rolling production line of its own characteristics and shape control methods of plate profile the defect control and its application are discussed in this paper. The main work and achievements are as follows:
(1) according to a large number of strip profile measurement and analysis found that the ultra wide rolling mill asymmetric and local high point defects such as strip profile, traditional convexity and wedge index cannot accurately describe the strip profile, thereby lowering the plate shape quality control and evaluation of accuracy. Therefore, through the influence of ultra wide defect characteristics strip profile and shape control of plate mill, puts forward the local point method of parameter identification of asymmetric index profile asymmetry and method of plate strip profile estimation based on weighted local plate profile, provides a new way to describe and control the strip profile.
(2) measurement and analysis of the non symmetric state of rolling mill and rolling mill at 2250mm Hot rolling, and the use of non symmetric roll deformation model and genetic effect method, studies the ultra wideband non symmetrical profile plate forming process, clear the influence of various factors on the asymmetric plate profile as well as genetic law in in the rolling process.
(3) due to the ultra wide hot strip mill rolling plan is complicated, and CVC work roll shifting characteristics and strip surface transverse temperature distribution characteristics caused by uneven wear, and genetic characteristics of plate profile, proposed and implemented work roll strip profile uneven wear calculation model based on the a new method is provided for the calculation of on-line roll wear.
(4) using local deformation model, the formation and evolution of the local point is studied, found that the frame of work roll wear is mainly caused by the local strip local high point, and the downstream frame work roll wear is the decisive factor to improve the quality of strip profile., made of high speed steel rolls in hot rolling of the results show that the downstream unit frame, the use of high speed steel roll can effectively improve the strip profile.
(5) according to the conclusions of the analysis theory and production data, proposed and implemented the rigidity of rolling mill, rolling deviation, control rolling transverse temperature distribution, adjustment scheme to regulate the use of high speed steel roll and rolling plan, make the 2250mm Hot Strip Mill profile defects of basic to control plate shape quality defects caused by commuted the plate profile defect rate decreased from 1.2% in 2012 to 0.02%. in 2014

【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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