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中文摘要：
外侧壁厚减薄是弯管成形中容易出现的加工缺陷之一,对于薄壁管小弯曲半径（R/D≤2）数控弯曲成形尤为严重。本文采用实验法,对该成形过程中弯曲段的壁厚减薄进行了深入研究,得到芯头个数、芯棒伸出量、弯曲角度、压块与管件摩擦条件、压块速度、相对弯曲半径、材料参数对壁厚减薄的影响规律。结果表明,合理增加压块与管件间的摩擦和压块速度,有助于控制壁厚减薄;1Cr18Ni9Ti管变形特点不同于LF2M管,后者更易出现拉裂缺陷。
英文摘要：
Outwall thinning is a main flaw in tube NC bending process, especially for the thin-walled tube with a small bending radius （R/D≤2）. Wall thinning of bending section in this forming process was investigated by the method of experiment. The influence laws of forming parameters, such as mandrel bails number, mandrel extension length, bending angle, friction between boost and tube, velocity of pressure die, bending radius and material parameters, were obtained. The results show that increasing the pressure die speed and friction between pressure die and tube suitably are benefit to wall thinning controlling. The deformation characteristic of 1Cr18Ni9Ti tube is different from that of LF2M tube, and LF2M tube is easily to be cracked.
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