本文選題：結(jié)構(gòu)參數(shù) + 優(yōu)化設(shè)計��； 參考：《沈陽建筑大學(xué)》2015年碩士論文

【摘要】：矯直作為一種精整技術(shù),其重要性日益突出,已成為工業(yè)發(fā)展不可或缺的分支。不等輥距矯直是一種先進的矯直技術(shù),融合了等輥距和變輥距矯直技術(shù)的特點,矯直精度高、矯直規(guī)格品種多、操作簡便、應(yīng)用前景廣闊。因此有必要對不等輥距矯直系統(tǒng)展開理論研究和應(yīng)用實踐,為企業(yè)應(yīng)用做技術(shù)積累。矯直過程的準(zhǔn)確理論解析是進行現(xiàn)場生產(chǎn)和控制的基本前提條件。本文根據(jù)鋼筋矯直原理,分析鋼筋在矯直過程中的受力和變形情況,了解鋼筋被不等輥距矯直機逐漸矯直的過程。依據(jù)金屬的彈塑性彎曲理論,研究一微小段鋼筋矯直過程中任意方向上的應(yīng)力、應(yīng)變、彎矩、回彈情況,找出原始曲率比、反彎曲率比與它們的關(guān)系,為后面的參數(shù)設(shè)計計算與仿真研究鋪墊理論基礎(chǔ)。本文根據(jù)不等輥距矯直技術(shù)的特點,確定矯直方案。根據(jù)接觸應(yīng)力和咬入條件確定各個矯直參數(shù)范圍,以總矯直力之和最小為目標(biāo)函數(shù),運用MATLAB中fmincon函數(shù)對輥距實現(xiàn)優(yōu)化設(shè)計,這種方式使矯直機處于一種較佳的狀態(tài),擁有較佳的矯直效果,為不等輥距矯直機的設(shè)計及研發(fā)提供了有價值的參考。進而得到各結(jié)構(gòu)參數(shù)及矯直力理論計算值。同時建立起曲率比和壓彎撓度之間的關(guān)系,計算出不同原始曲率比、不同鋼筋直徑下各輥的壓下量,找到它們之間的配比關(guān)系與變化規(guī)律。這種方式使在實際操作中給定壓下量變得更容易,效率更高,矯直精度更高。通過對鋼筋輥式矯直過程中的矯直工藝參數(shù)的研究,找到矯直不同直徑鋼筋時合理的矯直參數(shù),保證鋼筋矯直質(zhì)量,為實際生產(chǎn)中矯直參數(shù)的制定、優(yōu)化和矯直工藝提供科學(xué)依據(jù)。本文按照優(yōu)化后的輥距、輥徑、輥長和相應(yīng)的壓下量,應(yīng)用ANSYS/LS-DYNA軟件建立矯直系統(tǒng)動力學(xué)模型,進行Φ8、Φ10、Φ12mm鋼筋的矯直仿真研究,查看矯直力變化情況、直線度大小、殘余應(yīng)力分布,檢驗優(yōu)化設(shè)計效果,仿真模型與方法的合理性,亦不等輥距鋼筋矯直機的矯直質(zhì)量,并與等輥距鋼筋矯直機矯直效果作比較,進而驗證不等輥距鋼筋矯直機的優(yōu)勢。掌握該項仿真技術(shù)可以提高產(chǎn)品的生產(chǎn)效率,降低鋼筋矯直的成本,對于認(rèn)識和掌握鋼筋矯直的變形機理,進一步完善和發(fā)展輥式矯直理論,提供了新的研究手段。之后通過不等輥距鋼筋矯直機對Φ8、Φ10mm鋼筋進行的矯直實驗數(shù)據(jù)分析計算,和等輥距鋼筋矯直機實驗數(shù)據(jù)對比,同樣驗證不等輥距鋼筋矯直機矯直質(zhì)量更優(yōu),這為研究方法的實踐與推廣起到了決定性作用。同時,仿真與實驗研究具體形象地反映了等輥距與不等輥距矯直機的優(yōu)缺點,有利于操作中更好地利用它們,更好地推廣優(yōu)勢設(shè)備。本文采用的理論和仿真、實驗相結(jié)合的分析方法,就是對未來矯直技術(shù)研究的良好嘗試。對矯直關(guān)鍵技術(shù)的研究,具有一定的理論和現(xiàn)實意義。
[Abstract]:Straightening as a finishing technology, its importance is increasingly prominent, has become an indispensable branch of industrial development. Unequal roll spacing straightening is an advanced straightening technology, which combines the characteristics of equal roll spacing and variable roll spacing straightening technology. It has high straightening accuracy, many kinds of straightening specifications, simple operation and wide application prospect. Therefore, it is necessary to carry out theoretical research and application practice on the unequal roll spacing straightening system to accumulate technology for enterprise application. The accurate theoretical analysis of straightening process is the basic prerequisite for field production and control. According to the principle of steel bar straightening, the stress and deformation of steel bar in the process of straightening are analyzed, and the process of steel bar being straightened gradually by unequal roller straightener is understood. Based on the elastic-plastic bending theory of metal, the stress, strain, bending moment and springback in any direction in the process of straightening a small section of steel bar are studied, and the relationship between the original curvature ratio and the ratio of reverse bending rate is found out. It lays the theoretical foundation for the design, calculation and simulation of the parameters. According to the characteristics of unequal roll spacing straightening technology, the straightening scheme is determined in this paper. According to the contact stress and bite condition, the range of straightening parameters is determined. The minimum sum of total straightening force is taken as the objective function, and the fmincon function in MATLAB is used to realize the optimum design of roll spacing, which makes the straightener in a better state. It has better straightening effect and provides valuable reference for the design and development of unequal roller straightener. Then the calculated values of structure parameters and straightening force theory are obtained. At the same time, the relationship between curvature ratio and bending deflection is established, and the reduction of each roll under different original curvature ratio and different steel bar diameter is calculated. This approach makes it easier, more efficient and more accurate to give a reduction in practice. Through the research of the straightening process parameters in the steel bar roller straightening process, the reasonable straightening parameters can be found when straightening steel bars with different diameters, so as to ensure the straightening quality of the steel bars, and make the straightening parameters for the actual production. Optimize and straighten the technology to provide scientific basis. According to the optimized roll spacing, roll diameter, roll length and corresponding reduction, the dynamic model of straightening system is established by using ANSYS/LS-DYNA software, and the straightening simulation of 桅 8, 桅 10, 桅 12mm steel bar is carried out, and the changes of straightening force, straightness and residual stress distribution are observed. The optimization design effect, the rationality of simulation model and method, and the straightening quality of unequal roller spacing steel bar straightener are tested and compared with that of equal roll distance steel bar straightening machine, and the advantages of unequal roll spacing steel bar straightening machine are verified. Mastering the simulation technology can improve the production efficiency and reduce the cost of steel bar straightening. It provides a new research method for understanding and mastering the deformation mechanism of steel bar straightening and further improving and developing the roller straightening theory. After that, by analyzing and calculating the experimental data of 桅 8, 桅 10mm steel bar straightening machine with unequal roller spacing steel bar straightening machine, and comparing with the experimental data of equal roll spacing steel bar straightening machine, it is also proved that the straightening quality of unequal roll spacing steel bar straightening machine is better. This has played a decisive role in the practice and popularization of research methods. At the same time, the simulation and experimental research reflect the advantages and disadvantages of the equal-roll and unequal roller straighteners, which is beneficial to make better use of them in operation and to popularize the superior equipment. The theoretical, simulation and experimental analysis method used in this paper is a good attempt for the research of straightening technology in the future. The research on the key technology of straightening has certain theoretical and practical significance.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG333.23

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本文編號：1811902