TRB管无补料液压胀形波纹管的研究

Research on TRB pipe hydraulic bulging bellows without feeding material

首次通过理论设计建立了在无补料液压胀形波纹管时,TRB管参数与S、V、U型波纹管参数的关系,并建立了TRB管液压胀形S型、V型、U型波纹管的有限元模型,验证了无补料液压胀形技术的可行性。有限元模拟结果显示,S型波纹管的最大壁厚差为设计壁厚的8%,壁厚差大部分为设计壁厚的0%~2.25%;V型波纹管的最大壁厚差为设计壁厚的9.33%,壁厚差大部分为设计壁厚的0%~4.17%,壁厚分布均匀。成形极限图显示,S型和V型波纹管的成形应力状态均在安全区内,而U型波纹管在成形过程中发生破裂。因此,TRB管能成形为壁厚均匀的S型和V型波纹管,但不能成形为壁厚均匀的U型波纹管,模拟与理论设计基本吻合。

The relationships between TRB pipe parameters and S-shaped,V-shaped and U-shaped bellows parameters were established by theoretical design to establish the hydraulic bulging bellows without feeding material for the first time,and the finite element models of TRB pipe hydraulic bulging S-shaped,V-shaped and U-shaped bellows were established to verify the feasibility of hydraulic bulging without feeding material.The finite element simulation results show that the maximum wall thickness difference of S-shaped bellow is 8%of the designed wall thickness,and most of the wall thickness difference is 0%-2.25%of the designed wall thickness.The maximum wall thickness difference of V-shaped bellow is 9.33%of the designed wall thickness,most of the wall thickness difference is 0%-4.17%of the designed wall thickness,and the wall thickness is evenly distributed.The forming limit diagram shows that the forming stress states of S-shaped and V-shaped bellows are all within the safety zone,but U-shaped bellows break during the forming process.Therefore,TRB pipes can form S-shaped and V-shaped bellows with uniform wall thickness.But TRB pipes cannot form U-shaped bellows with uniform wall thickness.The simulation is basically consistent with the theoretical design.