鋁熱連軋跑偏控制模型及應(yīng)用研究
發(fā)布時間：2018-08-19 20:00
【摘要】：鋁熱連軋跑偏控制是迫切需要解決的技術(shù)難題。本文結(jié)合“3104寬幅熱軋卷跑偏控制策略研究”課題,以某鋁板帶生產(chǎn)線為依托,展開了鋁熱連軋的跑偏控制模型及應(yīng)用研究,提出了適用于現(xiàn)場的糾偏控制和自適應(yīng)控制策略。主要的研究內(nèi)容和研究成果如下： 1、)在熱連軋板帶跑偏演變機理的研究基礎(chǔ)上,提出了以軋制前后是否滿足恒定楔形率作為軋件跑偏控制的依據(jù)。(1)建立了軋件軋制過程楔形的觀測模型,選擇由恒楔形率計算出來的目標楔形與由觀測模型所計算出來的軋件出口楔形差作為軋件跑偏的觀測量；(2)依據(jù)該觀測量建立了軋件跑偏狀態(tài)的判據(jù),根據(jù)判據(jù)能準確判斷軋件的跑偏狀態(tài),并實現(xiàn)了對軋件跑偏的開環(huán)控制；(3)以MATLAB軟件中的Simulink工具為平臺,建立了軋件的跑偏數(shù)學模型。 21根據(jù)熱連軋生產(chǎn)線的橫向非對稱特征,提出了以輥縫差調(diào)整的平衡控制方法。(1)針對四輥軋機鋁熱連軋工藝過程的第一道和第二道軋制時板帶跑偏,進行調(diào)控仿真,得到可以采用調(diào)整輥縫差的方法對跑偏進行控制；(2)以軋件厚差為控制目標,以軋制力差為觀察量,以輥縫差為調(diào)整量的厚度平衡控制模型；(3)建立了以兩側(cè)輥縫差為調(diào)節(jié)量的輥縫差量分配模型。 31將所建立的跑偏控制模型應(yīng)用于鋁熱連軋生產(chǎn)現(xiàn)場,提出了適用于實際生產(chǎn)的跑偏控制策略。(1)將軋制過程的跑偏調(diào)控方案應(yīng)用于各機架,得到各機架的頭部和尾部糾偏圖,得出的結(jié)果驗證了跑偏控制方法的正確性；(2)將跑偏反饋模型應(yīng)用于機架之間,通過反饋前后軋制力差大小進行比較分析,得出反饋糾偏效果良好；(3)研發(fā)有自主知識產(chǎn)權(quán)的應(yīng)用于板帶熱連軋生產(chǎn)線的糾偏控制系統(tǒng),為實際生產(chǎn)提供了一個基于軋制力差的輥縫調(diào)節(jié)跑偏控制策略。 41在跑偏控制研究的基礎(chǔ)上,借助MSC.Marc有限元分析軟件模擬研究軋制過程中軋機后張力的改變對其跑偏量的影響規(guī)律,并對非對稱因素擾動下的尾部糾偏進行仿真。將調(diào)節(jié)后張力與未調(diào)節(jié)后張力兩種情況下的數(shù)值模擬情況進行比較,得到通過后張力的改變可以在一定程度上抑制軋件的跑偏。 51建立了軋制過程尾部跑偏模式的神經(jīng)網(wǎng)絡(luò)識別模型,開發(fā)了基于現(xiàn)場數(shù)據(jù)的軋制力差回歸調(diào)整曲線庫。以3104鋁材為例進行了仿真實驗及應(yīng)用,實現(xiàn)了生產(chǎn)線的有效糾偏,達到了預(yù)期糾偏的目的。
[Abstract]:The control of running deviation of hot strip mill is an urgent technical problem to be solved. In this paper, based on the subject of "study on the Control Strategy of running deviation of 3104 wide Hot Rolling coils", based on a certain aluminum strip production line, the model and application research of running deviation control of hot strip mill are carried out, and the deviation correction control and adaptive control strategy suitable for the field are put forward. The main research contents and results are as follows: 1. On the basis of the research on the evolution mechanism of strip deviation in hot strip rolling, Whether the constant wedge rate is satisfied before and after rolling is used as the basis for the control of the roll deviation. (1) the observation model of the wedge in the rolling process is established. The target wedge calculated from the constant wedge ratio and the wedge difference at the end of the piece calculated by the observation model are selected as the observation quantity of the deviation of the rolling piece. (2) based on the observed value, the criterion of the state of the deviation of the rolling piece is established. According to the criterion, the deviation state of workpiece can be judged accurately, and the open-loop control is realized. (3) the Simulink tool in MATLAB software is used as the platform. The mathematical model of deviation of rolling piece is established. 21 according to the transverse asymmetric characteristics of hot strip production line, The balance control method of adjusting roll gap difference is put forward. (1) aiming at the first and second strip running deviation of aluminum hot continuous rolling process of four-high rolling mill, the control simulation is carried out, and the method of adjusting roll gap difference can be used to control the running deviation; (2) the thickness balance control model, which takes the thickness difference of rolling piece as the control target, the difference of rolling force as the observation quantity and the gap difference of roll as the adjustment quantity; (3) the distribution model of roll gap difference is established, which takes the gap difference between two sides as the adjusting quantity. 31. The established model is applied to the production site of hot strip aluminum rolling. Put forward the control strategy of running deviation suitable for actual production. (1) apply the scheme of running deviation control in rolling process to each stand, obtain the head and tail deviation correction diagram of each frame, and get the result to verify the correctness of the running deviation control method; (2) the deviation feedback model is applied to the stand, the difference of rolling force before and after feedback is compared and analyzed, and the result of feedback correction is good. (3) A deviation correction control system with independent intellectual property is developed, which is used in strip hot strip production line. A control strategy of roll gap adjustment and deviation control based on rolling force difference is provided for practical production. 41 based on the research of running deviation control, By means of MSC.Marc finite element analysis software, the influence of the change of rolling mill post-tension on the deviation of rolling mill is studied, and the tail deviation correction under the disturbance of asymmetric factors is simulated. The numerical simulation of the tension after adjustment is compared with that of the unadjusted tension. It is concluded that the change of post-tension can restrain the deviation of rolling parts to a certain extent. 51 the neural network recognition model of tail deviation pattern in rolling process is established, and the rolling force difference regression adjustment curve library based on field data is developed. Taking 3104 aluminum as an example, the simulation experiment and application are carried out, and the effective deviation correction of the production line is realized, and the expected correction goal is achieved.
【學位授予單位】：中南大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TG339
本文編號：2192685
[Abstract]:The control of running deviation of hot strip mill is an urgent technical problem to be solved. In this paper, based on the subject of "study on the Control Strategy of running deviation of 3104 wide Hot Rolling coils", based on a certain aluminum strip production line, the model and application research of running deviation control of hot strip mill are carried out, and the deviation correction control and adaptive control strategy suitable for the field are put forward. The main research contents and results are as follows: 1. On the basis of the research on the evolution mechanism of strip deviation in hot strip rolling, Whether the constant wedge rate is satisfied before and after rolling is used as the basis for the control of the roll deviation. (1) the observation model of the wedge in the rolling process is established. The target wedge calculated from the constant wedge ratio and the wedge difference at the end of the piece calculated by the observation model are selected as the observation quantity of the deviation of the rolling piece. (2) based on the observed value, the criterion of the state of the deviation of the rolling piece is established. According to the criterion, the deviation state of workpiece can be judged accurately, and the open-loop control is realized. (3) the Simulink tool in MATLAB software is used as the platform. The mathematical model of deviation of rolling piece is established. 21 according to the transverse asymmetric characteristics of hot strip production line, The balance control method of adjusting roll gap difference is put forward. (1) aiming at the first and second strip running deviation of aluminum hot continuous rolling process of four-high rolling mill, the control simulation is carried out, and the method of adjusting roll gap difference can be used to control the running deviation; (2) the thickness balance control model, which takes the thickness difference of rolling piece as the control target, the difference of rolling force as the observation quantity and the gap difference of roll as the adjustment quantity; (3) the distribution model of roll gap difference is established, which takes the gap difference between two sides as the adjusting quantity. 31. The established model is applied to the production site of hot strip aluminum rolling. Put forward the control strategy of running deviation suitable for actual production. (1) apply the scheme of running deviation control in rolling process to each stand, obtain the head and tail deviation correction diagram of each frame, and get the result to verify the correctness of the running deviation control method; (2) the deviation feedback model is applied to the stand, the difference of rolling force before and after feedback is compared and analyzed, and the result of feedback correction is good. (3) A deviation correction control system with independent intellectual property is developed, which is used in strip hot strip production line. A control strategy of roll gap adjustment and deviation control based on rolling force difference is provided for practical production. 41 based on the research of running deviation control, By means of MSC.Marc finite element analysis software, the influence of the change of rolling mill post-tension on the deviation of rolling mill is studied, and the tail deviation correction under the disturbance of asymmetric factors is simulated. The numerical simulation of the tension after adjustment is compared with that of the unadjusted tension. It is concluded that the change of post-tension can restrain the deviation of rolling parts to a certain extent. 51 the neural network recognition model of tail deviation pattern in rolling process is established, and the rolling force difference regression adjustment curve library based on field data is developed. Taking 3104 aluminum as an example, the simulation experiment and application are carried out, and the effective deviation correction of the production line is realized, and the expected correction goal is achieved.
【學位授予單位】：中南大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TG339
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