【摘要】：感應(yīng)加熱技術(shù)涉及電磁場與溫度場等多物理場相互耦合問題，已經(jīng)成為了當(dāng)今冶金工程、電氣工程和材料科學(xué)等領(lǐng)域交叉研究的熱門課題。感應(yīng)加熱利用電磁感應(yīng)產(chǎn)生渦流焦耳熱對工件進行補償加熱，與傳統(tǒng)方法相比具有高效率、低污染、安全、精確控制等特點，在工業(yè)生產(chǎn)中得到普遍應(yīng)用。 熱連軋生產(chǎn)中，由于連鑄坯結(jié)晶水冷、傳送散熱，出現(xiàn)了軸向溫度“頭低尾高”和縱向橫截面溫度“芯表溫差”現(xiàn)象，傳統(tǒng)的二維有限元數(shù)值模擬方法只能對橫截面芯表溫差進行模擬分析，導(dǎo)致感應(yīng)加熱過程的模擬精度不高。針對這一問題，本文開展連鑄坯感應(yīng)加熱三維有限元數(shù)值模擬研究，主要做了以下幾方面工作： (1)連鑄坯感應(yīng)加熱三維有限元模型建立。根據(jù)電磁感應(yīng)原理，針對渦流場模型，將電磁場產(chǎn)生的渦流焦耳熱作為新的溫度場的內(nèi)熱源，確定初始條件和邊界條件，得出三維電磁—熱耦合場數(shù)學(xué)模型，建立了精確的有限元模型。 (2)連鑄坯感應(yīng)加熱三維有限元模擬驗證。根據(jù)連鑄坯感應(yīng)加熱實際工況，，對熱輻射和熱對流、軸向熱傳導(dǎo)、線圈電流與渦流相互影響和物理參數(shù)隨溫度變化等關(guān)鍵技術(shù)進行處理，利用有限元軟件ANSYS對電磁-熱耦合場進行三維有限元法模擬，根據(jù)三維模擬結(jié)果，與實際值和二維模擬結(jié)果進行對比驗證。 (3)連鑄坯感應(yīng)加熱效果影響因素分析。影響連鑄坯感應(yīng)加熱因素通常有兩類，一類是感應(yīng)器設(shè)備參數(shù)，如感應(yīng)器與工件的空隙、線圈匝數(shù)和感應(yīng)器在整個工藝生產(chǎn)線的安裝位置等；另一類是感應(yīng)器電參數(shù)，如輸出電流和輸出頻率等。經(jīng)過三維有限元模擬實驗得到：輸出電流和線圈匝數(shù)雖然不能影響溫度分布，但可以影響加熱效率；感應(yīng)器頻率可以改變鑄坯溫度分布，使邊角溫度得到補償加熱。在熱送過程中，有無保溫罩對鑄坯進入感應(yīng)器初始溫度影響較大。通過各因素對感應(yīng)加熱效果的分析，為提高連鑄坯感應(yīng)加熱質(zhì)量提供參數(shù)調(diào)節(jié)依據(jù)。
[Abstract]:Induction heating, which involves the coupling of electromagnetic field and temperature field, has become a hot topic in the field of metallurgical engineering, electrical engineering and material science. Induction heating uses eddy current Joule heat produced by electromagnetic induction to compensate and heat the workpiece. Compared with traditional methods, it has the characteristics of high efficiency, low pollution, safety and accurate control, and is widely used in industrial production. In hot strip rolling, due to the cooling of crystal and heat dissipation of continuous casting billet, the phenomenon of axial temperature "low end height" and longitudinal cross section temperature "core surface temperature difference" appears. The traditional two-dimensional finite element numerical simulation method can only simulate and analyze the temperature difference of cross-section core, which leads to the low accuracy of induction heating process. In order to solve this problem, the three-dimensional finite element simulation of induction heating for continuous casting billet is studied in this paper. The main works are as follows: (1) the three-dimensional finite element model of induction heating for continuous casting billet is established. According to the electromagnetic induction principle, according to the eddy current field model, the eddy current joule heat produced by the electromagnetic field is taken as the internal heat source of the new temperature field, and the initial conditions and boundary conditions are determined, and the mathematical model of the three-dimensional electromagnetic and thermal coupling field is obtained. An accurate finite element model is established. (2) 3D finite element simulation of induction heating for continuous casting billet. According to the actual condition of induction heating of continuous casting billet, the key technologies such as heat radiation and heat convection, axial heat conduction, interaction between coil current and eddy current, and the variation of physical parameters with temperature are dealt with. The finite element software ANSYS is used to simulate the electromagnetic and thermal coupling field. The results are compared with the actual values and two-dimensional simulation results. (3) the factors affecting the induction heating effect of continuous casting billet are analyzed. There are usually two kinds of factors affecting induction heating of continuous casting billet, one is inductor equipment parameter, such as the gap between inductor and workpiece, the number of coil turns and the installation position of inductor in the whole process production line, the other is inductor electric parameter. Such as output current and output frequency. Three dimensional finite element simulation experiments show that the output current and coil turns can not affect the temperature distribution, but can affect the heating efficiency, and the frequency of the inductor can change the temperature distribution of the billet and make the edge angle temperature compensated and heated. In the process of heat transfer, the influence of heat preservation cover on the initial temperature of billet entering inductor is great. Through the analysis of the effect of induction heating by various factors, the parameter adjustment basis is provided for improving the quality of induction heating of continuous casting billet.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG307

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