【摘要】：寬厚板是國家鋼鐵產業(yè)的重要組成部分,廣泛應用于軍事、工業(yè)、農業(yè)等國民經濟建設的各個領域。在寬厚板熱軋生產中,軋件尺寸控制不良造成大量的切頭尾、切邊損失,從而影響了軋件成材率的提高。軋件厚度尺寸在制定軋制工藝時就已確定,軋制變形過程中寬度尺寸和長度尺寸相互影響,相互制約,合理控制軋制變形過程中寬度變化對軋件尺寸控制具有重要意義。由于寬厚板熱軋過程的寬展屬于自由寬展,摩擦對軋件的變形過程具有不可忽視的作用。研究軋制過程中摩擦對寬展變形的影響可為軋件寬度的控制提供依據(jù)。因此,本文以寬厚板熱軋過程中寬展為研究對象,采用數(shù)值模擬的方法研究了軋制過程中摩擦對寬展變形的影響規(guī)律。首先,對寬展的影響因素及軋制過程中摩擦對變形的影響進行了綜合分析,并總結了軋制過程中摩擦的研究進展和廣泛使用的寬展計算公式。采用有限元軟件MSC.Marc,建立了寬厚板熱軋過程三維熱-力耦合有限元模型。為驗證有限元模型的可靠性,采用上述模型對實際寬厚板軋制過程進行模擬。模擬寬展和實測寬展符合較好,證明了模型的可靠性,這為開展摩擦對寬展影響規(guī)律研究奠定了工作基礎。其次,利用上述有限元模型對四種常見尺寸的寬厚板軋件在不同摩擦系數(shù)和不同壓下量條件下的軋制過程進行大量有限元模擬。結果表明,縱向摩擦力主要分布在寬度中心區(qū)域,橫向摩擦力集中在軋件邊部,摩擦力的大小均隨摩擦系數(shù)的增加而增加。摩擦系數(shù)的變化對軋件表層金屬寬向流動有一定影響,對下層金屬寬向流動影響較弱。隨摩擦系數(shù)的增加軋件側邊在自由表面處的寬展減小,厚度對稱面處的寬展增加。軋件的平均寬展隨摩擦系數(shù)的增加而降低,這種變化趨勢隨壓下量的增加和軋件寬度的減小而愈顯著。在以上寬展規(guī)律和模擬寬展數(shù)據(jù)的基礎上,用摩擦系數(shù)修正了芝原寬展計算公式。修正后的芝原寬展公式計算的寬展與模擬的寬展符合較好,可為寬厚板軋制過程中精確地控制寬展提供一定參考。
[Abstract]:As an important part of national steel industry, wide and thick plate is widely used in military, industrial, agricultural and other fields of national economic construction. In the hot rolling production of wide and thick plate, the poor control of the size of the workpiece causes a lot of loss of the cutting end and the end, thus affecting the improvement of the yield of the rolled piece. The thickness dimension of rolling piece has been determined when the rolling process is made. The width dimension and length dimension influence each other and restrict each other in the process of rolling deformation. It is of great significance to control the width change during rolling deformation process reasonably. Because the spread of the hot rolling process is free, friction plays an important role in the deformation process of the workpiece. The study of the influence of friction on the width of rolling can provide the basis for the control of the width of rolling piece. Therefore, in this paper, the influence of friction on the spread deformation of the hot rolling process is studied by numerical simulation, taking the width spread in the hot rolling process as the research object. Firstly, the influence factors of width expansion and the influence of friction on deformation in rolling process are analyzed synthetically, and the research progress of friction in rolling process and the widely used formula for width expansion are summarized. Using the finite element software MSC.Marc, a three-dimensional thermal-mechanical coupled finite element model for the hot rolling process of wide and thick plates is established. In order to verify the reliability of the finite element model, the rolling process of practical wide and thick plate was simulated by the above model. The result shows that the model is reliable, which lays a foundation for the study of the influence of friction on the spread. Secondly, the finite element model is used to simulate the rolling process of four kinds of wide and thick plate under different friction coefficient and different reduction. The results show that the longitudinal friction is mainly distributed in the center of the width and the transverse friction is concentrated on the side of the workpiece, and the friction force increases with the increase of the friction coefficient. The variation of friction coefficient has a certain influence on the wide flow of the metal in the surface layer of the workpiece, but it has a weak effect on the wide flow of the metal in the lower layer. With the increase of friction coefficient, the width of the side edge of the workpiece decreases at the free surface, and the width at the thickness symmetric surface increases. The average width of workpiece decreases with the increase of friction coefficient, and the change trend is more obvious with the increase of reduction and the decrease of the width of rolling piece. On the basis of the above expansion law and the simulated expansion data, the formula for calculating the spread of sesame was modified by the friction coefficient. The result of the modified formula is in good agreement with that of the simulation, which can provide a reference for the accurate control of the spread in the rolling process of thick and wide plate.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG335.5

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