波片波形对焊接金属波纹管刚度的影响∗

摘要

焊接金属波纹管是密封件中重要部件，波纹管刚度对密封件的密封性能有显著影响。以2种S型波形DN70波纹管为研究对象，建立波纹管的单波有限元模型，确定适合的边界条件，分别研究波片波形直线段、圆弧段几何尺寸对其刚度的影响，通过优化分析获得与设计公式偏差较小的波形尺寸。研究结果表明，波片波形尺寸对波纹管的刚度有明显影响，内圆斜边波形的波片刚度比内圆直边波形的刚度大，直线段波形对刚度的影响比圆弧段波形大。%Welded metal bellows are the important parts of seal components, whose stiffness has a significant effect on sealing performance� Taking two kinds of DN70 bellows with S⁃type waveform as the research objects, the finite element model of single⁃wave bellows was set up, the suitable constraints were established, and the influences of the waveform geo⁃metrical sizes of the wave plate with line segments and circular arc segments on the stiffness were studied� The waveform size which has a smaller deviation with the design formula was got by the optimization analysis� The results show that the waveform size has aobvious effect on the stiffness of bellows;The wave plate with inner circle bevel edge waveform has lar⁃ger stiffness than that with inner circle straight edge waveform;The influence of straight segment waveform on the stiffness is larger than the arc segment waveform.