本文選題：連鑄 + 二冷��； 參考：《沈陽(yáng)理工大學(xué)》2017年碩士論文

【摘要】：連鑄二次冷卻制度是影響鑄坯質(zhì)量的關(guān)鍵因素,不合理的冷卻制度會(huì)使鑄坯產(chǎn)生內(nèi)部裂紋、外部裂紋、鼓肚和中心偏析等缺陷。因此,對(duì)二冷區(qū)水量進(jìn)行優(yōu)化,獲得合理的連鑄二冷配水參數(shù)具有較大的實(shí)踐意義。本文以某鋼廠方坯連鑄機(jī)為對(duì)象,主要工作如下:一、建立鑄坯凝固傳熱模型。鑄坯凝固傳熱模型是模擬鑄坯凝固進(jìn)程和參數(shù)優(yōu)化的有效工具。本文從鑄坯凝固傳熱特點(diǎn)出發(fā),對(duì)建立模型所需的物性參數(shù)做了分析、選擇和計(jì)算,建立了二維傳熱模型,并用控制容積法對(duì)其進(jìn)行求解。二、數(shù)值模擬分析工藝參數(shù)對(duì)凝固過(guò)程的影響。在傳熱模型的基礎(chǔ)上,仿真分析了拉速和過(guò)熱度對(duì)方坯凝固的影響(溫度場(chǎng)、坯殼厚度),并結(jié)合冶金準(zhǔn)則構(gòu)造多目標(biāo)優(yōu)化目標(biāo)函數(shù),為下文二冷配水參數(shù)優(yōu)化提供理論基礎(chǔ)和數(shù)據(jù)支撐。三、開發(fā)了基于差分進(jìn)化算法的連鑄二冷水優(yōu)化多目標(biāo)優(yōu)化算法。將差分進(jìn)化算法應(yīng)用于連鑄二冷水優(yōu)化的多目標(biāo)優(yōu)化問題的求解,討論了多目標(biāo)優(yōu)化問題中要解決的關(guān)鍵問題,即種群多樣性的保持和目標(biāo)權(quán)重的處理。采用擁擠距離的方法維持種群的多樣性和分布性,用層次分析法進(jìn)行各優(yōu)化目標(biāo)函數(shù)之間的權(quán)重處理。優(yōu)化結(jié)果表明,該算法能夠兼顧解集的收斂性和分布性,且多次優(yōu)化一致性較好。四、連鑄二次冷卻制度的確立。將開發(fā)的優(yōu)化算法應(yīng)用于連鑄二冷水優(yōu)化問題的求解,對(duì)水量進(jìn)行優(yōu)化,并擬合出基于拉速-水量的關(guān)系曲線,確定連鑄二冷配水參數(shù),構(gòu)建合理的連鑄二次冷卻制度。將研究成果應(yīng)用于生產(chǎn)實(shí)際,有效提高連鑄質(zhì)量、改進(jìn)和升級(jí)連鑄生產(chǎn)工藝。
[Abstract]:The secondary cooling system of continuous casting is the key factor to affect the quality of the billet. Unreasonable cooling system will cause the defects of the billet such as internal crack, external crack, blooming and central segregation. Therefore, it is of great practical significance to optimize the quantity of water in secondary cooling zone and obtain reasonable parameters of secondary cooling water distribution for continuous casting. The main work of this paper is as follows: firstly, the solidification heat transfer model of billet is established. The solidification heat transfer model is an effective tool to simulate the solidification process and parameter optimization. Based on the characteristics of solidification heat transfer of billet, the physical parameters needed to establish the model are analyzed, selected and calculated in this paper. The two-dimensional heat transfer model is established and solved by the control volume method. Secondly, the influence of process parameters on solidification process is analyzed by numerical simulation. Based on the heat transfer model, the effects of drawing speed and superheat on billet solidification (temperature field, shell thickness) are simulated and analyzed. It provides theoretical basis and data support for the optimization of secondary cooling water distribution parameters below. Thirdly, a multi-objective optimization algorithm for continuous casting secondary cooling water optimization based on differential evolution algorithm is developed. The differential evolution algorithm is applied to solve the multi-objective optimization problem of continuous casting secondary cooling water optimization. The key problems to be solved in the multi-objective optimization problem are discussed, that is, the preservation of population diversity and the processing of target weight. The method of congestion distance is used to maintain the diversity and distribution of the population, and the analytic hierarchy process (AHP) is used to deal with the weights among the optimization objective functions. The optimization results show that the algorithm can give consideration to the convergence and distribution of the solution set, and the consistency of multiple optimization is good. Fourth, the establishment of secondary cooling system for continuous casting. The developed optimization algorithm is applied to solve the optimization problem of secondary cooling water in continuous casting, and the water quantity is optimized. Based on the relationship curve between drawing speed and water quantity, the parameters of secondary cooling water distribution for continuous casting are determined, and a reasonable secondary cooling system for continuous casting is constructed. The research results are applied to the production practice to improve the quality of continuous casting and to improve and upgrade the production process of continuous casting.
【學(xué)位授予單位】：沈陽(yáng)理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TF777;TP18

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