本文選題：扭振 + 自激振動(dòng)�。� 參考：《河北工程大學(xué)》2015年碩士論文

【摘要】：冶金工業(yè)是我國(guó)國(guó)民經(jīng)濟(jì)的的主力產(chǎn)業(yè)之一,軋鋼機(jī)械作為冶金生產(chǎn)的主要設(shè)備逐步向高速化,高載荷,連續(xù)化和大型化發(fā)展。其中冷連軋軋制精度高、帶鋼薄,對(duì)產(chǎn)品的質(zhì)量的把控也變得尤為的重要。與此同時(shí),軋制過(guò)程中軋機(jī)所產(chǎn)生的振動(dòng)問題對(duì)產(chǎn)品質(zhì)量和機(jī)械本身造成極大的影響,甚至破壞。軋制時(shí)所發(fā)生的打滑現(xiàn)象對(duì)軋機(jī)振動(dòng)、主傳動(dòng)系統(tǒng)和帶鋼質(zhì)量把控都影響巨大。邯鋼公司邯寶冷軋廠冷軋生產(chǎn)線由于其軋制力大、軋制速度高、軋制帶鋼薄等特點(diǎn)使其高速運(yùn)轉(zhuǎn)過(guò)程中的振動(dòng)現(xiàn)象頻繁出現(xiàn),本文以冷連軋機(jī)F4機(jī)組振動(dòng)問題為研究對(duì)象,針對(duì)其發(fā)生的打滑現(xiàn)象從以下幾個(gè)方面進(jìn)行研究:(1)根據(jù)冷連軋機(jī)F4機(jī)組主傳動(dòng)系統(tǒng)特性創(chuàng)建七自由度冷連軋機(jī)傳動(dòng)系統(tǒng)的扭轉(zhuǎn)振動(dòng)模型,通過(guò)MATLAB軟件計(jì)算求出F4機(jī)組主振型和固有頻率以及發(fā)生打滑現(xiàn)象時(shí)主傳動(dòng)系統(tǒng)各個(gè)軸段扭振振幅曲線。建立打滑現(xiàn)象發(fā)生時(shí)冷連軋機(jī)上傳動(dòng)系統(tǒng)自激振動(dòng)模型,計(jì)算得到了自激振動(dòng)并不穩(wěn)定的結(jié)果。(2)深入分析咬鋼打滑現(xiàn)象和軋制打滑現(xiàn)象的發(fā)生原因和機(jī)理,通過(guò)分析找到影響打滑現(xiàn)象的軋制因素,以此為基礎(chǔ)提出打滑因子作為打滑現(xiàn)象發(fā)生的判斷條件,并考慮實(shí)際工況進(jìn)行修正。(3)運(yùn)用ANSYS/LS-DYNA對(duì)軋制過(guò)程仿真,通過(guò)仿真得到了軋制過(guò)程對(duì)帶鋼的影響,并得到了不同摩擦系數(shù)、壓下比、軋制速度和張力作用下軋制力變化曲線和變形區(qū)金屬流動(dòng)相對(duì)速度變化曲線。以此為基礎(chǔ)提出了針對(duì)打滑現(xiàn)象的可控措施。(4)通過(guò)冷連軋機(jī)F4機(jī)組軋制數(shù)據(jù)對(duì)打滑因子進(jìn)行了驗(yàn)證,并通過(guò)此得到了適合該機(jī)組的打滑現(xiàn)象安全系數(shù)。通過(guò)F4機(jī)組軋制工藝參數(shù)對(duì)影響打滑因子的因素進(jìn)行分析,得到了影響打滑因子的因素變化趨勢(shì)。通過(guò)現(xiàn)場(chǎng)數(shù)據(jù)得到了一些根據(jù)理論判斷沒有得出的影響因素之間的關(guān)系。最后根據(jù)冷連軋機(jī)整體特性分析得出了實(shí)際生產(chǎn)中F4機(jī)組抑制打滑現(xiàn)象的可行性措施,并針對(duì)乳化液的性能對(duì)帶鋼與軋輥間摩擦系數(shù)的影響進(jìn)行分析,從乳化液皂化值、PH值和鐵粉含量對(duì)摩擦系數(shù)的影響三方面做調(diào)整,得到了最佳調(diào)整閾值以抑制打滑現(xiàn)象的發(fā)生。
[Abstract]:Metallurgical industry is one of the main industries in national economy of our country. As the main equipment of metallurgical production, steel rolling machinery is gradually developing to high speed, high load, continuous and large scale. The rolling precision of cold continuous rolling is high, the strip is thin, and the control of product quality is especially important. At the same time, the vibration caused by rolling mill has a great influence on the product quality and the machinery itself. The slip phenomenon in rolling has a great influence on rolling mill vibration, main transmission system and strip quality control. Because of its large rolling force, high rolling speed and thin strip rolling, the vibration phenomenon of cold rolling production line in Hanbao Cold Rolling Plant of Handan Iron and Steel Co., Ltd., is frequently appeared during its high-speed operation. This paper takes the vibration problem of F4 unit of cold tandem mill as the research object. Based on the characteristics of main transmission system of F4 tandem cold rolling mill, the torsional vibration model of the drive system of seven degrees of freedom cold tandem mill is established according to the following aspects: 1. The main vibration mode and natural frequency of F4 unit and the torsional vibration amplitude curves of each shaft section of the main transmission system are calculated by MATLAB software. The self-excited vibration model of the upper transmission system of tandem cold rolling mill is established, and the results of unstable self-excited vibration are obtained. (2) the causes and mechanism of the phenomenon of steel bite and rolling slip are analyzed in depth. Based on the analysis of the rolling factors that affect the slip phenomenon, the paper puts forward the skid factor as the judging condition of the skid phenomenon, and modifies the rolling process by considering the actual working conditions.) the rolling process is simulated by ANSYS- / LS-DYNA, and the rolling process is simulated by ANSYS / LS-DYNA. The influence of rolling process on strip steel was obtained by simulation, and the curves of rolling force and relative velocity of metal flow in deformation zone were obtained under different friction coefficient, reduction ratio, rolling speed and tension. Based on this, the controllable measures for the slip phenomenon are put forward. (4) the slip factor is verified by the rolling data of the F4 tandem cold rolling mill, and the safety factor of the slip phenomenon suitable for the unit is obtained. Through the analysis of the factors affecting the slip factor through the rolling process parameters of the F4 unit, the variation trend of the factors affecting the slip factor is obtained. Based on the field data, the relationships between some factors which are not determined by theory are obtained. Finally, according to the analysis of the whole characteristics of the cold tandem mill, the feasible measures of restraining the slip phenomenon of the F4 unit in the actual production are obtained, and the influence of the performance of the emulsion on the friction coefficient between the strip steel and the roll is analyzed. The optimum adjustment threshold was obtained from the three aspects of the influence of the saponification value of emulsion and the content of iron powder on the friction coefficient in order to restrain the occurrence of skidding.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG333

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