【摘要】：雙輥鑄軋技術(shù)是冶金及材料加工領(lǐng)域內(nèi)的一項前沿技術(shù)。其工作原理為將熔融狀態(tài)下的金屬液體澆入兩個反方向旋轉(zhuǎn)的鑄軋輥和側(cè)封壩組成的熔池中,在極短的時間內(nèi),由于鑄軋輥的冷卻作用和軋制作用,熔融狀態(tài)下的金屬液體被鑄軋成為厚度很小的金屬薄帶。因此在雙輥鑄軋技術(shù)中的熱量輸出的速率、鑄軋過程中的熱流密度、金屬溶液的冷卻速度、熱流的峰值都比傳統(tǒng)連鑄連軋技術(shù)要高。所以雙輥鑄軋技術(shù)相比于傳統(tǒng)連鑄連軋技術(shù)有著速度快、流程短、能耗低、成本低等優(yōu)點。并且由于鑄軋冷卻速度快可以起到使晶粒細(xì)化、偏析減少的目的,從而使鑄帶的質(zhì)量能夠得到改善。在該工藝中,鑄軋輥同時起著結(jié)晶器和變形工具的作用,所以鑄軋輥及時有效地冷卻是整個鑄軋過程順利進(jìn)行的關(guān)鍵所在。在鎂合金雙輥鑄軋過程中鑄軋輥是雙輥式鎂合金鑄軋機(jī)最主要的工作關(guān)鍵部件,特別是鎂這種金屬易燃容易發(fā)生事故,因此在鑄軋過程中冷卻極其重要。而在整個過程鎂合金雙輥過程都是在冷卻水的強(qiáng)烈冷卻作用下進(jìn)行的。所以研究冷卻水溫度及冷卻水流速度對鑄軋輥溫度場的影響,可以進(jìn)一步加深對鑄軋工藝問題的認(rèn)識。本文利用ANSYS有限元軟件模擬在鎂合金鑄軋過程中鑄軋輥在的溫度場分布。通過分析其他條件一定的情況下,不同冷卻水溫度及冷卻水速下鑄軋輥軸向和周向溫度場的分布情況,得出在鎂合金鑄軋過程中提高冷卻水速可以降低鑄軋輥的溫度場,但隨著冷卻水速的提高這種能力逐漸減弱;而冷卻水溫度對鑄軋輥溫度場影響不大.并設(shè)計了一種提高鑄軋輥的冷卻能力的外冷系統(tǒng),彌補(bǔ)了鑄軋輥在鎂合金快速鑄軋中冷卻能力不足的問題。為現(xiàn)場工作提供重要的參考依據(jù)。
[Abstract]:The technology of two-roll casting and rolling is one of the frontier technologies in metallurgy and material processing. The working principle is that the molten metal liquid is poured into the molten pool composed of two reverse rotating casting rolls and side sealing dams. In a very short period of time, due to the cooling and rolling action of the casting rolls, Molten metal liquid is cast into a thin strip of metal with a very small thickness. Therefore, the rate of heat output, the heat flux during casting and rolling, the cooling rate of metal solution and the peak value of heat flux in twin-roll casting and rolling technology are higher than those in traditional continuous casting and rolling technology. Compared with the traditional continuous casting and rolling technology, the double roll casting and rolling technology has the advantages of high speed, short flow, low energy consumption and low cost. Because of the fast cooling rate of casting rolling, the grain size can be refined and the segregation can be reduced, thus the quality of the cast strip can be improved. In this process, the casting roll plays the role of mould and deformation tool simultaneously, so the key point of the whole casting process is to cool the roll in time and effectively. In the process of magnesium alloy twin-roll casting is the most important part of twin-roll magnesium alloy casting mill. Especially magnesium metal is flammable and prone to accidents so cooling is extremely important in casting rolling process. In the whole process, the double-roll process of magnesium alloy is carried out under the strong cooling effect of cooling water. So the influence of cooling water temperature and cooling water flow velocity on the temperature field of casting roll can be further understood. In this paper, ANSYS finite element software is used to simulate the temperature distribution of casting roll in magnesium alloy casting process. By analyzing the distribution of axial and circumferential temperature field of casting roll under different cooling water temperature and cooling water speed under certain other conditions, it is concluded that increasing cooling water speed in casting process of magnesium alloy can reduce the temperature field of casting roll. However, with the increase of cooling water speed, the ability of cooling water becomes weaker. However, the cooling water temperature has little effect on the casting roll temperature field. An external cooling system was designed to improve the cooling capacity of casting roll, which made up for the insufficient cooling capacity of casting roll in magnesium alloy rapid casting rolling. To provide important reference basis for site work.
【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】：2017
【分類號】：TG333.17

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