Abstract
In order to improve bent tube forming quality and limit, the reasonable mandrel parameters need to obtain during tube bending process. A three dimensional (3D) elasto-plastic finite element (FE) model of the whole process of TA18 high strength titanium alloy tube during numerical control rotary draw bending (RDB) was developed based on the FE software of ABAQUS, and its reliability was verified. Then, simulation and analysis of the mandrel role in tube numerical control RDB was carried out by using the model. The results show that the wall thinning increases and the cross section distortion decreases with increasing of mandrel extension length or mandrel diameter. The optimal range of the mandrel extension length and mandrel diameter is 0.5mm-1.5mm and 5.2372mm-5.3872mm, respectively.
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