圆柱面翻边成形预制孔优化设计方法研究

发布时间：2018-03-21 01:28

本文选题：翻边成形　切入点：预制孔　出处：《山东建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着工业技术和城市建设的快速发展,大型管网在化工企业、油气运输和城市排污等系统中获得了广泛的应用。随着管网向大型化、高压化发展,对管道的安全性提出了越来越高的要求。管道接头类零件作为管网系统的关键构件,其市场需要越来越大,同时也对该类零件的生产工艺提出了更高的要求。管道接头是管网系统中加工最为复杂、材料浪费最多环节,研究一种新型的高效、节约材料、绿色的金属管道接头成形工艺方法具有重要的工程应用价值。因此本文研究和讨论了一种圆柱面支管成形的新方法——翻边成形加工工艺。与传统管道支管的制作工艺相比,翻边成形的加工工艺更高效、更节约材料、零件物理性能也更好,而且翻边成形的管道支管,主管与支管的接触部分比较圆滑,可以大大减少液体在分支处的流动阻力。但是,在圆柱面上翻边支管在国内的研究还是处于初级阶段,满足多样式支管成形的工艺要求还比较困难。本文就圆柱面翻边成形的几处关键的问题进行了讨论:(1)利用翻边成形预制孔设计的等线长理论,考虑翻边位置的偏心和翻边形状的变化等情况,建立了圆柱面翻边成形预制孔数学模型,并应用Delphi开发了预制孔计算的软件,可直接根据工艺参数计算出预制孔的形状和尺寸,并可以以图形和数据两种方式输出计算结果。(2)利用SolidWorks建立坯料和模具的几何模型,利用有限元分析软件DYNAFORM对圆柱面翻边成形过程进行了成形过程分析。应用模拟结果并对数学模型进行了验证,结果表明所建立的数学模型基本正确,模拟成形的高度与理想值接近。(3)设计制造了圆孔和方孔的圆柱面翻边成形模具,利用液压机对圆柱面翻边成形过程进行了实验研究,并将实验结果与模拟结果相对比,二者吻合良好,表明本文建立的有限元模型和采用的模拟分析方法是可靠的。(4)针对圆柱面翻边成形预制孔设计问题,以翻边端口平整度为优化目标,以成形工件的完整性为约束条件,建立优化模型;以有限元模拟为目标函数和约束条件的求解器,以基于等线长理论的优选搜索法为优化设计方法,对优化模型进行了求解。优化设计结果表明,所建立的优化设计方法收敛速度快,优化结果可靠。
[Abstract]:With the rapid development of industrial technology and urban construction, large-scale pipe networks have been widely used in chemical enterprises, oil and gas transportation and urban sewage systems. As the key component of pipe network system, the market demand of pipe joint parts is increasing. At the same time, the production technology of this kind of parts is also put forward higher requirements. Pipeline joint is the most complicated and wasteful link in pipe network system. A new type of efficient and economical material is studied. The green metal pipe joint forming process has important engineering application value. Therefore, a new forming method of cylindrical branch pipe forming, flanging forming process, is studied and discussed in this paper. The flanging forming process is more efficient, saves more material, and the physical properties of the parts are better, and the pipe branch pipe formed by the flanging forming, the contact part between the supervisor and the branch pipe is smooth, which can greatly reduce the flow resistance of the liquid at the branch. The domestic study of flanged branch tubes on cylindrical surfaces is still in its infancy. It is difficult to meet the technological requirements of multi-type branch tube forming. In this paper, several key problems of cylindrical flanging forming are discussed in this paper. The theory of equal line length is used to design prefabricated holes for flanging forming. Considering the eccentricity of flanging position and the change of flanging shape, the mathematical model of prefabricated hole for cylindrical flanging forming is established, and the software for calculating prefabricated hole is developed by using Delphi. The shape and size of prefabricated hole can be calculated directly according to the technological parameters. The geometric model of blank and die can be established by using SolidWorks. The forming process of cylindrical flanging is analyzed by finite element analysis software DYNAFORM. The simulation results and the mathematical model are verified. The results show that the established mathematical model is basically correct. The cylindrical flanging forming die of circular hole and square hole is designed and manufactured. The process of cylinder flanging forming is studied experimentally by hydraulic press, and the experimental results are compared with the simulation results. The results show that the finite element model and the simulation analysis method are reliable, aiming at the design of prefabricated holes for flanging forming of cylindrical surface, and the flatness of flanging port is the optimization objective. Taking the integrity of the formed workpiece as the constraint condition, the optimization model is established, the finite element simulation is used as the solver of the objective function and the constraint condition, and the optimal selection search method based on the equal-line length theory is used as the optimization design method. The optimal design results show that the proposed optimal design method converges quickly and the optimization results are reliable.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG306

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