【摘要】：隨著科學(xué)技術(shù)的不斷進(jìn)步,各行業(yè)都呈現(xiàn)出突飛猛進(jìn)的發(fā)展勢頭,對板帶鋼的質(zhì)量和產(chǎn)量要求也越來越高。然而軋機(jī)振動問題是影響板帶鋼質(zhì)量和產(chǎn)量的重要原因之一,對此國內(nèi)外學(xué)者對于軋機(jī)振動問題進(jìn)行了大量的研究。但在結(jié)構(gòu)方面大多研究的都是軋機(jī)局部系統(tǒng)的振動,不能綜合地考慮在軋機(jī)各部件相互作用影響下軋機(jī)整體振動特點(diǎn)。在外部激振力方面關(guān)于以軋制力作為軋機(jī)激振力的研究,大部分把軋制力都作為恒定力施加在軋機(jī)上來研究軋機(jī)的振動特性,而忽略了由于板帶鋼的存在軋制力是波動的力這一特點(diǎn)。實(shí)際上軋機(jī)振動的因素有很多,而軋制過程中波動的軋制力對軋機(jī)系統(tǒng)的影響是造成軋機(jī)振動甚至嚴(yán)重?fù)p壞的主要原因之一,也是軋機(jī)振動領(lǐng)域中需要一直重視的研究方向。本文綜合考慮了輥系軸承座與機(jī)架之間的間隙、支承輥和工作輥之間的線性剛度和非線性阻尼等影響因素,以包括主傳動系統(tǒng)、軸承座、機(jī)架為一體的1580四輥軋機(jī)系統(tǒng)為研究對象進(jìn)行合理簡化,建立了該軋機(jī)振動的幾何分析模型�；贏NSYS有限元軟件,對建立的1580四輥軋機(jī)系統(tǒng)模型進(jìn)行了數(shù)值模擬計(jì)算,計(jì)算了軋機(jī)的固有頻率及主振型。將計(jì)算結(jié)果與在生產(chǎn)現(xiàn)場對該軋機(jī)進(jìn)行剛度測試實(shí)驗(yàn)獲得的數(shù)據(jù)進(jìn)行對比,證明了該軋機(jī)建模的合理性,也直觀的了解了軋機(jī)振動的固有特性,并為下一步的仿真分析提供了理論依據(jù)。基于已經(jīng)建立的1580四輥軋機(jī)振動模型,在LS-DYNA顯性動力學(xué)分析軟件中進(jìn)行軋機(jī)軋制過程的仿真。增加塑性軋件來為軋機(jī)施加波動的軋制力,得到在波動的軋制力的作用下軋機(jī)振動的特性。通過LS-Pre Post、Matlab等軟件來獲取軋機(jī)各部件的一系列振動曲線,觀察及分析軋機(jī)在軋件咬入階段的振動特性,這為優(yōu)化軋機(jī)結(jié)構(gòu)或解決實(shí)際工作中軋機(jī)出現(xiàn)的異常振動都提供了理論參考。
[Abstract]:With the continuous progress of science and technology, every industry is showing a rapid development momentum, and the quality and output of strip steel are more and more demanding. However, the vibration problem of rolling mill is one of the important reasons that affect the quality and output of strip and plate. Many scholars at home and abroad have done a lot of research on the vibration problem of rolling mill. However, in the aspect of structure, the vibration of the local system of the rolling mill is mostly studied, and the overall vibration characteristics of the mill cannot be considered comprehensively under the influence of the interaction of the various parts of the mill. In the aspect of external exciting force, most of the rolling force is applied to the rolling mill as a constant force to study the vibration characteristics of the rolling mill. The rolling force is a fluctuating force due to the existence of strip steel. In fact, there are many factors of rolling mill vibration, and the effect of rolling force fluctuating during rolling process on rolling system is one of the main causes of rolling mill vibration and even serious damage, and it is also the research direction that needs to be paid attention to in the field of rolling mill vibration. In this paper, the influence factors, such as the clearance between the bearing seat of the roller system and the frame, the linear stiffness and the nonlinear damping between the backup roll and the work roll, are considered synthetically to include the main transmission system, the bearing seat, etc. The 1580 four high rolling mill system with the frame as an integral whole was reasonably simplified and the geometric analysis model of the rolling mill vibration was established. Based on the finite element software ANSYS, the system model of 1580 four high rolling mill is numerically simulated, and the natural frequency and main vibration mode of the mill are calculated. Comparing the calculation results with the data obtained from the stiffness test of the mill at the production site, it is proved that the modeling of the mill is reasonable, and the inherent characteristics of the rolling mill vibration are intuitively understood. It also provides the theoretical basis for the next simulation analysis. Based on the established vibration model of 1580 four high rolling mill, the rolling process is simulated in LS-DYNA explicit dynamic analysis software. The vibration characteristics of the rolling mill under the action of the fluctuating rolling force are obtained by increasing the plastic workpiece to apply the fluctuating rolling force to the rolling mill. A series of vibration curves of various parts of the rolling mill are obtained by using LS-Pre postscript Matlab software, and the vibration characteristics of the rolling mill during the bite stage are observed and analyzed. It provides a theoretical reference for optimizing the structure of rolling mill and solving the abnormal vibration of rolling mill in practice.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG333

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