CT20钛合金薄壁管材数控冷弯成形行为研究

Research on Deformation Behaviors of CT20 Titanium Alloy Thin-walled Tubes during Numerically Controlled Bending

薄壁管材的小弯曲半径数控弯曲成形十分困难,外侧壁厚减薄是弯管成形中的加工缺陷之一,对于钛合金薄壁管尤为严重。采用模拟与实验相结合的方法,对规格为58 mm×1.5 mm的CT20钛合金管材数控弯曲成形过程中弯曲段的壁厚减薄进行了研究,得到相对弯曲半径对壁厚减薄的影响规律。结果表明,CT20钛合金管材冷弯成形时的极限相对弯曲半径(R/D)为2。

It＇ s very difficult in small bending radius （R/D ＜ 2） numerically controlled （NC） bending forming of the thin-walled tubes and wall thickness thinning is one of the defects of pipe bending forming,especially serious in titanium alloy.The wall thickness variation in the NC bending of CT20 titanium alloy thin-walled tubes in bending area were investigated using the method of numerical simulation and experiment.The influence rules of wall thickness thinning with relative bending radius were determined.The results show that the ultimate bending radius （R/D） of CT20 titanium alloy tube for cold bending forming is 2.