外侧壁厚变薄而出现裂纹以及内侧壁厚过度变厚出现失稳而起皱是管材弯曲加工中常见的缺陷,该缺陷的产生与管材的原始壁厚t0、相对弯曲半径R及管材的外径d0有关,从管材变形理论出发,推导了管材在弯曲过程中弯曲段外侧和内侧管壁厚度的变化大小的表达公式。 The outer wall thickness becomes thin and cracks occur and the inner wall thickness becomes too thick and destabilizes. The wrinkling is a common defect in the pipe bending process. The defect occurs when the original wall thickness t0, the relative bending radius R and the outer Based on the theory of pipe deformation, the expression of the variation of the thickness of pipe wall on the outside and inside of the curved section during the bending process is deduced.