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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/259


    Title: 精軋不對稱軋延條件對鋼帶尾板側偏之影響
    Authors: 邴軍程;BING, JYUN-CHENG
    Contributors: 機械工程系研究所
    Keywords: 熱軋精軋;尾端彎曲;軋延區形狀參數;中心線偏移;軋輥輥縫差;組裝間隙;hot rolling;finishing mill;hook;rolling zone shape parameter;side walk;leveling;assembly gap
    Date: 2017
    Issue Date: 2019-07-17
    Publisher: 機械工程系研究所
    Abstract: 在熱軋製程中由於加熱爐位於輸送線側邊,鋼胚在寬度方向產生溫度梯度,導致軋延時發生縱向彎曲(Camber)與中心線偏移(Side Walk)現象影響鋼帶品質,並進而造成後續精軋區鋼帶尾端彎曲和中心線偏移等鋼帶不對稱外形。在精軋產線中鋼帶的厚度較薄,當鋼帶尾端具不對稱外形時,撞擊邊導器容易翻起造成產品以及產線機構之損壞,現場對此的解決方法為調整軋輥輥縫差產生側向力使鋼帶中心線往軋機中心線移動,減少中心線偏移。精軋區中軋機除了可藉人為調控輥縫差來修正鋼帶軋延過程不對稱行為外,軋機與軋輥的組裝間隙也是影響鋼帶軋延的因素之一。組裝間隙若控管得當可以避免中心線偏移量的加劇,減少發生鋼帶尾端撞擊的可能性,目前現場的控管規範為根據現場經驗長期觀察所制定。為了探討精軋區軋輥輥縫差和軋機組裝間隙兩樣重要因素對精軋過程鋼帶運動與板形的影響,本研究利用有限元素軟體ABAQUS依照熱軋產線操作條件建立熱軋精軋模型。在輥縫差的探討方面,建立精軋第一至四站軋機數值模型和尾端彎曲之鋼帶,設定不同軋輥輥縫差、鋼帶尾端彎曲量、軋延區形狀參數進行軋延模擬。主要探討各站不同輥縫差對軋輥兩側軋延力差、鋼帶尾端中心點偏移、鋼帶運動行為。分析各項軋延參數對鋼帶軋延結果之影響。在組裝間隙的探討方面,建立精軋第四站數值模型且固定鋼帶尾端彎曲量和軋輥輥縫差進行模擬。藉由改變上下軋輥相對位置,分析各組軋輥相對位置的徑向和軸向間隙情形,分析各組數值模型鋼帶軋延之軋輥兩側軋延力差、鋼帶尾端中心點偏移、鋼帶運動行為。藉由探討徑向、軸向間隙和鋼帶軋延的關係以供後續研究進行邊界條件的設定。從模擬結果得知,間隙的不對稱性較間隙層級的增加對鋼帶軋延結果影響較為顯著。
    Since the heat furance is allocated on one side of a transmission line in hot rolling process, transverse temperature gradient along the width direction may lead to camber and side walk of the strip. These problems in roughing mill raised an asymmetrical profile of the strip in subsequent finishing mill. The thickness of strip in finish mill is much thinner than that in roughing mill. If the strip has an asymmetrical profile, it is very likely to hit the side guide and may result in damage of strip in production line. To solve this problem, it is usually to adjust the leveling of the work roll. The lateral force exerted on the strip could reduce the center line deviation and correct the side walk of the strip back to the center line of the mill. Apart from adjusting the leveling to correct the strip asymmetrical behavior in rolling, the assembly gaps between mill housing and rolls are another factors which influence the rolling result. A well-managed assembly gap control can reduce the center line deviation and reduce the instability of strip, such as tail pinch. The current on-site control algorithms in finishing mill are based on long-term observation. They are so far empirical instead of being analytical from modeling.In order to investigate the effect of the assembly gaps between housing and rolls, and the leveling in the finish rolling, finite element software ABAQUS was used to establish a hot rolling mill model according to the physical and operational conditions of hot rolling finishing mill production line. In the aspect of the leveling, numerical simulation model of the firth to the fourth finishing mill was established to investigate the effect of different leveling, hook in the end of strip and rolling zone shape parameter on the deviation of the end of the strip and the strip motion.In the aspect of the assembly gaps, investigation was concentrated on the fourth finishing mill with the assumption of 30mm hook and zero leveling of the strip. By varying the relative position of the upper and lower rolls, combinations of the radial and axial assembly gap conditions were simulated to investigate the differential force, the deviation of the center line in the end of strip and the strip movement behavior. A further evaluation on the severity of the degree of gap tolerance and of the asymmetry conditions of assembly gap can be explored. The effect of asymmetry conditions is more significant than the effect of the magnitude of the assembly gaps.
    Appears in Collections:[機械工程學系] 學位論文

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