板寬對板形影響的研究
發(fā)布時間：2018-10-08 18:54
【摘要】：板形是板帶材的重要指標(biāo)之一,另外一個指標(biāo)是板厚,板厚控制技術(shù)已經(jīng)非常成熟,但板形板厚控制是一個復(fù)雜的變量系統(tǒng),板形控制和板厚控制之間存在著很強的耦合關(guān)系,厚度控制精度的提高也直接導(dǎo)致了板形控制的難題。雖然HC軋機、CVC軋機、PC軋機等已經(jīng)在工業(yè)生產(chǎn)中較為普及,但是這些都只是通過軋鋼設(shè)備的優(yōu)化來改善板形的,對于板帶材本身因素的影響研究較為欠缺,但這些因素是不可忽略的,甚至?xí)䦟堉频淖罱K板形產(chǎn)生很大影響。目前對于板帶軋制的有限元仿真模型有很多,但是,許多學(xué)者在模擬過程中會把很多條件理想化,存在很多實際問題的簡化或者假設(shè),這會對計算精度及板形變化產(chǎn)生較大的影響。因此本文在進(jìn)行大量實驗的基礎(chǔ)上建立了實驗室四輥可逆冷軋機有限元計算模型,本模型的特點是把輥身以及輥徑設(shè)置為彈塑性體,從而更好的和實際工況相吻合,并對比分析了實驗數(shù)據(jù)和模擬數(shù)據(jù),得出了板寬對軋后板形的影響規(guī)律;并通過所建立的有限元模型,進(jìn)一步研究了板寬對軋輥壓扁的和軋輥撓曲變形的影響,這是僅通過實驗無法獲得的,僅通過模擬又無法保證其準(zhǔn)確性的,這正是本文建立出和實驗數(shù)據(jù)相一致的仿真模型的意義所在。本文的主要研究內(nèi)容和結(jié)果如下:(1)在實驗所取的速度范圍內(nèi),軋機縱向剛度隨軋制速度的增大是減小的,而軋機橫向剛度隨軋制速度的變化不是單調(diào)的,而是波動的,在軋制速度為0.2m/s時橫向剛度和縱向剛度的組合最優(yōu);由于板寬較大時,軋機的橫向剛度和縱向剛度均較大,所以軋機在軋制和輥身長度相接近的軋件時軋制的板形最良好,厚度的控制也最準(zhǔn)確;(2)在實驗所研究的板寬范圍內(nèi),軋機的縱向剛度和橫向剛度均隨板寬的變大是呈增加的趨勢,但增加的形式及趨勢有所不同。其成因是軋制力及軋制力的分布綜合作用的結(jié)果;(3)在軋件板寬范圍內(nèi),工作輥彈性壓扁較大,在板寬范圍之外,軋輥的彈性壓扁迅速減小,并且板寬在180mm范圍內(nèi)時,工作輥的彈性壓扁是隨著板寬的增大而增大的,在板寬為220mm時,工作輥的彈性壓扁減小,并且支承輥壓扁的趨勢和工作輥總體上具有一致性,板寬為60mm時是個特例;(4)隨著板寬的增加,支撐輥的撓度和工作輥的撓度變化趨勢是一致的,即在板寬100mm到220mm的范圍內(nèi),工作輥和支撐輥的撓度都是隨著板寬的增加而增加的,但板寬較窄時會有特例出現(xiàn)。
[Abstract]:The flatness is one of the important indexes of sheet and strip, and the other index is the thickness of the plate. The control technology of the thickness of the plate is very mature, but the control of the thickness of the plate is a complicated variable system, and there is a strong coupling relationship between the shape control and the thickness control. The improvement of thickness control precision also directly leads to the difficulty of shape control. Although the HC mill and PC mill have been popularized in the industrial production, but these are only through the optimization of the rolling equipment to improve the shape of the plate, the research on the influence of the plate and strip itself factors is relatively lacking. However, these factors can not be ignored, and even have a great impact on the final shape of rolling. At present, there are many finite element simulation models for strip rolling, but many scholars will idealize a lot of conditions in the simulation process, and there are many practical problems simplified or hypothesized. This will have a great impact on the calculation accuracy and shape change. On the basis of a large number of experiments, the finite element model of the four high reversible cold rolling mill is established in this paper. The characteristic of the model is that the roll body and the diameter of the roll are set up as the elastoplastic body, which is in better agreement with the actual working conditions. The experimental data and simulation data are compared and analyzed, and the influence of plate width on the shape of the plate after rolling is obtained, and the effect of plate width on roll flattening and roll deflection is further studied through the established finite element model. This can not be obtained only through experiments, but also can not be guaranteed by simulation. This is the significance of the simulation model which is consistent with the experimental data in this paper. The main contents and results of this paper are as follows: (1) the longitudinal stiffness of the rolling mill decreases with the increase of the rolling speed, while the change of the transverse stiffness of the rolling mill with the rolling speed is not monotonous, but fluctuating. When the rolling speed is 0.2m/s, the combination of transverse stiffness and longitudinal stiffness is optimal, because the transverse stiffness and longitudinal stiffness of the rolling mill are both larger when the plate width is larger, so the rolling mill has the best shape when rolling the workpiece with the same length as the roll body. The thickness control is also the most accurate. (2) in the range of plate width studied in the experiment, the longitudinal and transverse stiffness of rolling mill increase with the increase of plate width, but the increasing form and trend are different. The cause of formation is the comprehensive effect of the rolling force and the distribution of the rolling force. (3) the elastic flattening of the work roll is larger in the wide range of the workpiece, and the elastic flattening of the roll decreases rapidly outside the wide range of the plate, and the width of the plate is within the range of 180mm. The elastic flattening of the work roll increases with the increase of the plate width. When the plate width is 220mm, the elastic flattening of the work roll decreases, and the trend of the flattening of the backup roll is consistent with the work roll in general. (4) with the increase of plate width, the deflection of the supporting roll is consistent with the deflection of the work roll, that is, in the range from 100mm to 220mm, the deflection of the work roll and the supporting roll increases with the increase of the plate width. However, there will be a special case when the width of the plate is narrower.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG335
本文編號：2257893
[Abstract]:The flatness is one of the important indexes of sheet and strip, and the other index is the thickness of the plate. The control technology of the thickness of the plate is very mature, but the control of the thickness of the plate is a complicated variable system, and there is a strong coupling relationship between the shape control and the thickness control. The improvement of thickness control precision also directly leads to the difficulty of shape control. Although the HC mill and PC mill have been popularized in the industrial production, but these are only through the optimization of the rolling equipment to improve the shape of the plate, the research on the influence of the plate and strip itself factors is relatively lacking. However, these factors can not be ignored, and even have a great impact on the final shape of rolling. At present, there are many finite element simulation models for strip rolling, but many scholars will idealize a lot of conditions in the simulation process, and there are many practical problems simplified or hypothesized. This will have a great impact on the calculation accuracy and shape change. On the basis of a large number of experiments, the finite element model of the four high reversible cold rolling mill is established in this paper. The characteristic of the model is that the roll body and the diameter of the roll are set up as the elastoplastic body, which is in better agreement with the actual working conditions. The experimental data and simulation data are compared and analyzed, and the influence of plate width on the shape of the plate after rolling is obtained, and the effect of plate width on roll flattening and roll deflection is further studied through the established finite element model. This can not be obtained only through experiments, but also can not be guaranteed by simulation. This is the significance of the simulation model which is consistent with the experimental data in this paper. The main contents and results of this paper are as follows: (1) the longitudinal stiffness of the rolling mill decreases with the increase of the rolling speed, while the change of the transverse stiffness of the rolling mill with the rolling speed is not monotonous, but fluctuating. When the rolling speed is 0.2m/s, the combination of transverse stiffness and longitudinal stiffness is optimal, because the transverse stiffness and longitudinal stiffness of the rolling mill are both larger when the plate width is larger, so the rolling mill has the best shape when rolling the workpiece with the same length as the roll body. The thickness control is also the most accurate. (2) in the range of plate width studied in the experiment, the longitudinal and transverse stiffness of rolling mill increase with the increase of plate width, but the increasing form and trend are different. The cause of formation is the comprehensive effect of the rolling force and the distribution of the rolling force. (3) the elastic flattening of the work roll is larger in the wide range of the workpiece, and the elastic flattening of the roll decreases rapidly outside the wide range of the plate, and the width of the plate is within the range of 180mm. The elastic flattening of the work roll increases with the increase of the plate width. When the plate width is 220mm, the elastic flattening of the work roll decreases, and the trend of the flattening of the backup roll is consistent with the work roll in general. (4) with the increase of plate width, the deflection of the supporting roll is consistent with the deflection of the work roll, that is, in the range from 100mm to 220mm, the deflection of the work roll and the supporting roll increases with the increase of the plate width. However, there will be a special case when the width of the plate is narrower.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG335
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