本文選題：鎂合金 + 卷取機(jī)�。� 參考：《遼寧科技大學(xué)》2015年碩士論文

【摘要】：近年來,我國(guó)工業(yè)現(xiàn)代化發(fā)展進(jìn)程迅速,鎂合金逐漸受到重視,不斷擴(kuò)大應(yīng)用領(lǐng)域,具有十分廣闊的前景,尤其在需求輕量化材質(zhì)的領(lǐng)域中,如3C電子、汽車以及航天航空等行業(yè)。鎂合金優(yōu)點(diǎn)在于其產(chǎn)品具有重量輕、良好的機(jī)械性能和耐腐蝕等等。因此,鎂合金的研究重點(diǎn)是鎂合金薄板帶材的研發(fā)和生產(chǎn)。作為生產(chǎn)過程的最末道工序,卷取技術(shù)的控制精度對(duì)最終產(chǎn)品的質(zhì)量產(chǎn)生直接影響。卷取張力的施加對(duì)板形質(zhì)量和厚度精度都有很大影響,因此,保證卷取張力的穩(wěn)定性是我們研究的目標(biāo)和方向。本文以我校鎂合金實(shí)驗(yàn)研究中心的可逆六輥溫軋機(jī)為實(shí)驗(yàn)背景,深入研究軋制鎂合金薄帶過程中,張力控制系統(tǒng)的特點(diǎn)和控制手段,最終實(shí)現(xiàn)恒張力卷取的控制任務(wù)。論文首先根據(jù)張力的產(chǎn)生原理及幾種張力控制方式的對(duì)比,選擇基于恒線速度的恒張力控制方法。仔細(xì)分析整體控制系統(tǒng)后,建立相關(guān)的數(shù)學(xué)模型。針對(duì)卷取電機(jī)在變速時(shí)以及直徑改變的過程中產(chǎn)生的張力波動(dòng),提出補(bǔ)償動(dòng)態(tài)力矩以及計(jì)算瞬時(shí)卷徑。根據(jù)工況實(shí)驗(yàn),結(jié)合相關(guān)的檢測(cè)儀表建立可逆六輥溫軋機(jī)工藝參數(shù)監(jiān)測(cè)系統(tǒng),并利用西門子S7-200的工控設(shè)備,將現(xiàn)場(chǎng)實(shí)時(shí)運(yùn)行情況以及過程數(shù)據(jù)通過人機(jī)界面進(jìn)行實(shí)時(shí)顯示以便于監(jiān)控。由于鎂合金薄帶軋制工藝技術(shù)的復(fù)雜性,并且張力系統(tǒng)的時(shí)變參數(shù)問題,采用傳統(tǒng)PID控制不能完全達(dá)到最佳的控制效果,因此研討在張力控制系統(tǒng)中加入增益自調(diào)節(jié)PID算法。根據(jù)現(xiàn)場(chǎng)具體參數(shù),分別仿真并分析對(duì)基于常規(guī)PID控制系統(tǒng)和基于增益自調(diào)度PID控制系統(tǒng),結(jié)果說明自調(diào)節(jié)PID控制方式具有更好動(dòng)態(tài)性能和魯棒性,可避免系統(tǒng)性能受參數(shù)變化影響。最后根據(jù)工藝要求以及控制原理編制程序到PLC,并且建立友好的人機(jī)界面,通過采集、處理和分析實(shí)驗(yàn)數(shù)據(jù),結(jié)果表明控制算法可行有效。因此,本文為今后實(shí)際軋制加入自適應(yīng)控制手段和完善張力控制系統(tǒng)設(shè)備提供理論上的支持,并且對(duì)張力控制系統(tǒng)計(jì)算機(jī)仿真的更深入研究奠定了理論基礎(chǔ)。
[Abstract]:In recent years, with the rapid development of industrial modernization in China, magnesium alloys have been paid more and more attention to, and their applications have a broad prospect, especially in the field of lightweight materials, such as 3C electronics. Automotive and aerospace industries. Magnesium alloy has the advantages of light weight, good mechanical properties and corrosion resistance. Therefore, the research focus of magnesium alloy is the R & D and production of magnesium alloy sheet and strip. As the final process of the production process, the control precision of the coiling technology has a direct impact on the quality of the final product. The application of coiling tension has great influence on the shape quality and thickness accuracy. Therefore, it is our goal and direction to ensure the stability of coiling tension. In this paper, based on the reversible six-high temperature rolling mill of magnesium alloy experimental research center in our school, the characteristics and control methods of tension control system in rolling magnesium alloy strip are studied in depth, and the control task of constant tension coiling is finally realized. Firstly, according to the principle of tension generation and the comparison of several tension control methods, a constant tension control method based on constant linear velocity is selected. After careful analysis of the overall control system, the related mathematical model is established. In view of the tension fluctuation caused by the coiling motor in the process of changing speed and changing the diameter, the dynamic torque compensation and the calculation of instantaneous winding diameter are proposed. According to the working condition experiment, the monitoring system for the process parameters of reversible six-high temperature mill is established by combining the relevant measuring instruments, and the industrial control equipment of Siemens S7-200 is used. The real-time operation and process data are displayed through the man-machine interface to facilitate monitoring. Because of the complexity of rolling technology of magnesium alloy strip and the time-varying parameters of tension system, the traditional PID control can not achieve the best control effect, so the gain self-adjusting PID algorithm is studied in the tension control system. According to the specific parameters in the field, the simulation and analysis of the conventional PID control system and the gain based self-scheduling PID control system are carried out respectively. The results show that the self-regulating PID control method has better dynamic performance and robustness. The system performance can be avoided by the change of parameters. Finally, according to the process requirements and the control principle, the program is compiled to PLC, and a friendly man-machine interface is established. The experimental data are collected, processed and analyzed. The results show that the control algorithm is feasible and effective. Therefore, this paper provides theoretical support for practical rolling to add adaptive control means and perfect tension control system equipment, and lays a theoretical foundation for further research on computer simulation of tension control system.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG333
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本文編號(hào)：1824349