使用TRB管无补料的液压胀形成形阶梯管的研究

Study on Hydraulic Bulging of Stepped Tube Formed by TRB Tube without Feeding

建立了TRB(轧制差厚板)管无轴向补料阶梯管液压胀形的有限元模型,研究了TRB管的过渡区和胀形区长度及阶梯管的设计壁厚对终成形件壁厚分布的影响,并对某轴向非对称阶梯管的成形进行了模拟。结果表明:成形件最小壁厚与设计壁厚的最大差值为0.109 mm,为设计壁厚的5.45%,而最大壁厚与设计壁厚的最大差值为0.117 mm,为设计壁厚的5.85%;非轴向对称阶梯管成形中最小壁厚、最大壁厚与设计壁厚的差分别为设计壁厚的4%与4.88%,因此,壁厚分布是均匀的。随设计壁厚增大,壁厚差和最小壁厚与设计壁厚的差增大;过渡区长度增大,壁厚差增大,在过渡区长度小于30 mm时,最小壁厚与设计壁厚的差快速减小,之后变化不明显;胀形区的长度对两个壁厚差的影响规律相似,随账形区长度增大,均为先减后增且壁厚差值变化量不大。

A finite element model of stepped tube hydraulic bulging without axial feeding using tailor-rolled blank (TRB) tube was established.The influences of the lengths of transition zone and bulging zone of TRB tube and designed wall thickness of stepped pipe on thickness distribution of the final forming part were studied.The forming of a axial asymmetric stepped tube was simulated.The results indicate that the maximum difference between the minimum wall thickness and the designed wall thickness is 0.109 mm,which is 5.45% of the designed wall thickness.The maximum difference between the maximum wall thickness and the designed wall thickness is 0.117 mm,which is 5.85% of the designed wall thickness.The difference between the minimum,maximum wall thickness and the degined wall thickness are 4% and 4.88% of the designed wall thickness,respectively,so the distribution of the wall thickness is uniform.With the increase of the designed thickness, the difference between the wall thickness difference and the difference between the minimum wall thickness and the designed wall thickness increases.With the increase of transition zone length,the wall thickness length increases,when the length of the transition zone is less than 30 mm,the difference between the minimum wall thickness and the designed wall thickness decreases rapidly,and then the change is not obvious.The effect of the length of bulging region on the two wall thickness differences is similar,with the increase of bulging region length,the two wall thickness differences decrease firstly then increase,and the variation of the difference is small.