关键词: 无缝钢管, 壁厚偏差, 管坯几何模型, 推压-拉拔复合缩径

Abstract: A geometric model of tube with wall thickness deviation and a mechanics model of push-pull necking were established， through measuring wall thickness distribution of the tube used in 6.5t automobile axle-housing.The difference of stress and deformation between the side of thinner and thicker wall of tube were analyzed.The numerical simulation of the different wall thickness deviations was set up， and the influences of the deviations on the stresses of the transmission area and law of wall thickness deformations were revealed.In addition， the maximum value of the circumferential wall thickness deviations of the tube were given based on the stability of the transmission area.The samples were successfully produced on the special nencking equipment.The experimental results are consistent with the finite element simulation.

Key words: seamless steel tube, wall thickness deviation, geometric model of tube blank, pushing-pulling necking