波纹管参数对TRB管胀形S型波纹管壁厚分布的影响

Effect of bellows parameters on wall thickness distribution of TRB pipe bulging S-shaped bellows

为研究TRB管无轴向补料胀形S型波纹管壁厚分布影响因素,通过理论设计构建了TRB管坯参数与S型波纹管参数的几何关系,并建立了胀形有限元模型。研究了S型波纹管参数波纹圆心角、波纹曲率半径、波纹管内半径对壁厚分布的影响。圆心角增大时,设计壁厚与最大壁厚的差(正差)、与最小壁厚的差(负差)以及最大壁厚与最小壁厚的差(总差)快速增大,圆心角对壁厚分布影响显著。当圆心角为42°时,负差为设计壁厚的11.4%,总差为19.3%,壁厚分布不均匀。曲率半径和波纹管内半径对壁厚分布影响不显著,合理的参数范围内,TRB管胀形S型波纹管壁厚分布均匀。

In order to study the influencing factors on the wall thickness distribution of S-shaped bellows by TRB tube bulging without axial feeding,the geometric relationship between the parameters of TRB pipe and S-shaped bellows is established through theoretical design,and the finite element model of bulging is established.The influence of the S-shaped bellows parameters including the included angle of corrugated,radius of corrugated curvature,and inner diameter on the wall thickness distribution is studied.The difference between the maximum and design wall thickness(positive difference),between the minimum and design wall thickness(negative difference),and between the maximum and minimum wall thickness(total difference)rapidly increase when the angle increases,the angle has a significant impact on the wall thickness distribution.When the angle is 42°,the negative difference is 11.4%and total difference is 19.3%of the design wall thickness,the wall thickness is pockety.Curvature radius and inner diameter have no significant influence on wall thickness distribution.Within a reasonable range of parameters,the wall thickness distribution of TRB tube bulged S-shaped bellows is uniform.