發(fā)布時間：2018-04-23 22:33

  本文選題：弧形管相貫線 + 割炬運動位姿　； 參考：《杭州電子科技大學(xué)》2015年碩士論文

【摘要】：管件相貫結(jié)構(gòu)以其結(jié)構(gòu)穩(wěn)定性和外型美觀越來越多地運用于火車站、飛機航站樓和展館等大型建筑。隨著審美需求的不斷提升，，管件相貫類型也呈多樣性趨勢發(fā)展，其中弧形管相貫結(jié)構(gòu)因其曲線美感越來越受到設(shè)計者們的青睞。然而，弧形管相貫線的直接切割還存在許多技術(shù)難題，因此鋼結(jié)構(gòu)企業(yè)只能采取一些變通方法，從而導(dǎo)致切割后的弧形管存在較大的空間誤差而無法直接應(yīng)用，節(jié)點拼裝質(zhì)量下降，甚至造成巨大經(jīng)濟損失。因此，研究一種有效的弧形管相貫線切割方法和切割設(shè)備具有重要意義。 論文首先分析相貫線切割技術(shù)和切割設(shè)備的發(fā)展現(xiàn)狀，列出弧形管相貫線切割研究中存在的主要技術(shù)問題，指出了傳統(tǒng)的空間幾何解析法在求解弧形管相貫線模型方面的不足，提出了一種新的求解方法，并探討了多種弧形管相貫線建模技術(shù)和切割算法。該求解方法主要采用UG二次開發(fā)技術(shù)提取弧形管相貫線離散數(shù)據(jù)點，運用軌跡反求方法擬合得到弧形管相貫線的軌跡表達式，進而推導(dǎo)出各個切割參數(shù)的求解方法。 其次，探討運用雙擺頭五軸切割設(shè)備切割生成弧形管相貫線的加工工序，基于該結(jié)構(gòu)，提出了以雙準均勻B樣條曲線插補割炬運動位姿的思路。同時，分析了插補軌跡弓高誤差計算方法，并提出了一種改進的圓弧近似法來控制其弓高誤差，從而確定了弧形管相貫線切割插補控制算法。在Matlab中對該插補算法進行了實例仿真，結(jié)果表明該插補算法可用于割炬運動位姿插補。 最后，利用UG NX8.0和Vericut7.2對弧形管相貫線切割進行五軸聯(lián)動仿真，在UG NX8.0中完成了相貫線切割割炬軌跡規(guī)劃并仿真驗證了割炬軌跡的正確性，通過UG后處理模塊得到割炬運動位姿的NC程序，在Vericut7.2多軸數(shù)控仿真軟件中建立弧形管相貫線數(shù)控切割設(shè)備模型，實現(xiàn)了對割炬運動位姿的虛擬切割仿真。通過Vericut7.2中的自動-比較模塊驗證了所得到的割炬運動位姿的NC程序是正確實用的。 論文工作所完成的弧形管相貫線生成方法、相貫線割炬運動位姿建模以及雙準均勻B樣條割炬位姿插補控制算法，為弧形管復(fù)雜相貫線直接切割技術(shù)的工程應(yīng)用提供指導(dǎo)。
[Abstract]:Tubular intersecting structure is more and more used in railway station, aircraft terminal and exhibition hall for its structural stability and beautiful appearance. With the continuous improvement of aesthetic demand, the intersecting types of pipe fittings also show a variety of trends, among which the curved tubular intersecting structure is more and more favored by designers because of its aesthetic sense of curve. However, there are still many technical problems in direct cutting of arc-shaped pipe intersecting line, so steel structure enterprises can only adopt some alternative methods, which lead to large spatial error of cut arc tube and can not be directly applied. The quality of joint assembly decreased, and even caused huge economic losses. Therefore, it is of great significance to study an effective intersecting wire cutting method and cutting equipment. Firstly, the paper analyzes the development of intersecting wire cutting technology and cutting equipment, lists the main technical problems in the research of arc tube intersecting line cutting, and points out the shortcomings of the traditional spatial geometric analysis method in solving the arc tube intersecting line model. In this paper, a new method of solving the problem is presented, and several modeling techniques and cutting algorithms of arc intersecting line are discussed. This method mainly uses UG secondary development technology to extract the discrete data points of the arc tube intersecting line. The trajectory expression of the arc tube intersecting line is obtained by using the trajectory reverse method, and the solution method of each cutting parameter is deduced. Secondly, this paper discusses the machining process of cutting arc tube intersecting line by using double pendulum head five-axis cutting equipment. Based on this structure, the idea of cutting torch position and pose with double quasi-uniform B-spline curve interpolation is put forward. At the same time, the method of calculating the error of interpolation trajectory bow height is analyzed, and an improved circular arc approximation method is proposed to control the error of the arc height. Thus, the interpolation control algorithm of arc intersecting linear cutting is determined. The simulation of the interpolation algorithm in Matlab shows that the interpolation algorithm can be used for cutting torch motion position and pose interpolation. Finally, using UG NX8.0 and Vericut7.2 to carry on the five-axis linkage simulation to the arc tube intersecting wire cutting, completed the path planning of the intersecting wire cutting torch in UG NX8.0 and verified the correctness of the cutting torch trajectory by simulation. The NC program of cutting torch position and pose is obtained by UG post-processing module. The model of arc tube intersecting line NC cutting equipment is established in Vericut7.2 multi-axis numerical control simulation software, and the virtual cutting simulation of cutting torch motion posture is realized. The NC program of cutting torch motion posture is proved to be correct and practical by the automatic-comparison module in Vericut7.2. The method of generating intersecting line of arc tube, the modeling of cutting torch motion position and the control algorithm of double quasi-uniform B-spline cutting torch position interpolation, which provide guidance for the engineering application of the complex intersecting direct cutting technology of arc tube.
【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】：TG48

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