弯管相贯线切割技术研究

发布时间：2018-04-23 22:33

本文选题：弧形管相贯线 + 割炬运动位姿　；参考：《杭州电子科技大学》2015年硕士论文

【摘要】：管件相贯结构以其结构稳定性和外型美观越来越多地运用于火车站、飞机航站楼和展馆等大型建筑。随着审美需求的不断提升，，管件相贯类型也呈多样性趋势发展，其中弧形管相贯结构因其曲线美感越来越受到设计者们的青睐。然而，弧形管相贯线的直接切割还存在许多技术难题，因此钢结构企业只能采取一些变通方法，从而导致切割后的弧形管存在较大的空间误差而无法直接应用，节点拼装质量下降，甚至造成巨大经济损失。因此，研究一种有效的弧形管相贯线切割方法和切割设备具有重要意义。论文首先分析相贯线切割技术和切割设备的发展现状，列出弧形管相贯线切割研究中存在的主要技术问题，指出了传统的空间几何解析法在求解弧形管相贯线模型方面的不足，提出了一种新的求解方法，并探讨了多种弧形管相贯线建模技术和切割算法。该求解方法主要采用UG二次开发技术提取弧形管相贯线离散数据点，运用轨迹反求方法拟合得到弧形管相贯线的轨迹表达式，进而推导出各个切割参数的求解方法。其次，探讨运用双摆头五轴切割设备切割生成弧形管相贯线的加工工序，基于该结构，提出了以双准均匀B样条曲线插补割炬运动位姿的思路。同时，分析了插补轨迹弓高误差计算方法，并提出了一种改进的圆弧近似法来控制其弓高误差，从而确定了弧形管相贯线切割插补控制算法。在Matlab中对该插补算法进行了实例仿真，结果表明该插补算法可用于割炬运动位姿插补。最后，利用UG NX8.0和Vericut7.2对弧形管相贯线切割进行五轴联动仿真，在UG NX8.0中完成了相贯线切割割炬轨迹规划并仿真验证了割炬轨迹的正确性，通过UG后处理模块得到割炬运动位姿的NC程序，在Vericut7.2多轴数控仿真软件中建立弧形管相贯线数控切割设备模型，实现了对割炬运动位姿的虚拟切割仿真。通过Vericut7.2中的自动-比较模块验证了所得到的割炬运动位姿的NC程序是正确实用的。论文工作所完成的弧形管相贯线生成方法、相贯线割炬运动位姿建模以及双准均匀B样条割炬位姿插补控制算法，为弧形管复杂相贯线直接切割技术的工程应用提供指导。
[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.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG48

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