發(fā)布時間：2018-04-20 05:21

  本文選題：厚壁管 + 斜軋穿孔　； 參考：《西安建筑科技大學》2017年碩士論文

【摘要】：在斜軋穿孔過程中,軋輥對于管坯的作用力會沿軋制線的方向傳遞到頂頭及頂桿上。當此軸向力過大時,會導致頂桿失穩(wěn)發(fā)生彎曲,從而使軋制出來的鋼管發(fā)生彎曲變形。為了防止這種情況的發(fā)生,則需要安裝定心裝置來保證毛管軸線和軋制中心線保持一致,確保頂桿在軋制過程中具有較高的穩(wěn)定性。同時,會降低頂頭和頂桿的消耗,提高生產(chǎn)作業(yè)率。然而現(xiàn)有的斜軋穿孔機出口裝置定心輥的位置是均勻布置的,定心輥的安裝位置與頂桿的實際失穩(wěn)位置不一致,進而引起失穩(wěn)防控能力低并增加不必要的設備投資及維修費用。針對上述問題,本文采用理論分析以及有限元模擬方法對頂桿定心輥安裝位置以及失穩(wěn)控制效果進行研究分析,主要研究內(nèi)容和分析如下:根據(jù)壓桿失穩(wěn)力學分析建立了u及ω的模型,對頂桿的失穩(wěn)位置和彎曲撓度值進行分析計算,確定頂桿的失穩(wěn)條件、失穩(wěn)位置以及定心裝置的布置形式。計算分析表明:頂桿的失穩(wěn)危險點是非對稱的,一般10~12m長的頂桿,從頂桿尾端至頂頭端的排布位置依次是:采用ABAQUS有限元模擬軟件建立頂桿受力彎曲模型,模擬不同因素在非均布定心裝置與均布定心裝置條件下對頂桿失穩(wěn)彎曲過程的影響。模擬結果表明:頂桿一端固定一端鉸支時的失穩(wěn)危險點在距離固定端2/3L處,非均布定心裝置比均布定心裝置的防控效果好。在Φ240mm二輥斜軋穿孔機設備條件下,模擬了頂桿受力的彎曲過程。用ABAQUS軟件結合實際頂桿受力情況建立有限元模型,模擬了不同因素對頂桿臨界失穩(wěn)力、最大撓度值以及等效應力的影響。模擬結果表明:隨著頂桿直徑的增加,臨界失穩(wěn)力增加,彎曲的最大撓度值減小,等效應力增加;隨著頂桿長度的增加,失穩(wěn)臨界力減小,彎曲的最大撓度值增加,等效應力增加。在1600KN四柱液壓機設備條件下,進行頂桿受力彎曲的試驗檢驗。試驗結果表明:頂桿受力彎曲后的失穩(wěn)位置均在距離頂桿固定端2/3處,彎曲時所受軸向力、撓度值的變化趨勢與理論計算及模擬結果相符。然而,由于試驗條件受到限制,試驗并不是在理想狀態(tài)下進行的,導致?lián)隙戎蹬c理論計算及模擬結果之間存在一定的誤差,但誤差都在±10%以內(nèi)。
[Abstract]:In the process of cross-rolling piercing, the force of roll on tube billet will be transferred to the top and top rod along the rolling line. When the axial force is too large, the buckling of the jacking rod will occur and the rolled steel tube will bend and deform. In order to prevent this from happening, it is necessary to install a centering device to ensure the consistency between the capillary axis and the rolling centerline, and to ensure the high stability of the top rod in the rolling process. At the same time, it will reduce the head and rod consumption, improve the production rate. However, the position of the centering roller of the outlet device of the existing cross-rolling piercer is uniformly arranged, and the installation position of the centering roller is not consistent with the actual unstable position of the top rod, which leads to the low capability of instability prevention and control and increases the unnecessary equipment investment and maintenance cost. In order to solve the above problems, theoretical analysis and finite element simulation method are used to study the installation position and instability control effect of the centering roller. The main research contents and analysis are as follows: according to the analysis of the buckling mechanics of the pressure-rod, the models of u and 蠅 are established, and the unstable position and bending deflection of the jacking rod are analyzed and calculated, and the instability conditions of the jacking rod are determined. The unstable position and the arrangement of the centering device. The calculation and analysis show that the dangerous point of instability of the top rod is asymmetrical. The arrangement position from the end of the top rod to the end of the head of the top rod is in the order of 10 ~ 12m long. The bending model of the force of the top rod is established by using ABAQUS finite element simulation software. The influence of different factors on the buckling process of the rod under the condition of non-uniform centring device and homogenizing centering device was simulated. The simulation results show that the unsteady danger point of one end hinge support is 2 / 3 L from the fixed end, and the control effect of the non-uniform centring device is better than that of the uniform centring device. Under the condition of 桅 240mm two-roll cross-rolling piercing machine, the bending process of the force acting on the top rod is simulated. The finite element model is established by using ABAQUS software combined with the actual force of the jacking rod. The effects of different factors on the critical instability force, maximum deflection value and equivalent stress of the jacking rod are simulated. The simulation results show that with the increase of the diameter of the rod, the critical instability force increases, the maximum deflection of the bending decreases and the equivalent stress increases, and with the increase of the length of the top rod, the critical force decreases and the maximum deflection of the bending increases. The equivalent stress increases. Under the condition of 1600KN four-column hydraulic press equipment, the force bending test of the top rod is carried out. The experimental results show that the position of instability of the top rod after bending is 2 / 3 from the fixed end of the top rod. The variation trend of axial force and deflection value is consistent with the theoretical calculation and simulation results. However, due to the limitation of the test conditions, the test is not carried out in ideal condition, which leads to a certain error between the deflection value and the theoretical calculation and simulation results, but the error is within 鹵10%.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG333.8

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