TA32钛合金板成形性能与电磁辅助弯曲成形实验研究

由于TA32钛合金板室温成形性差、精度难以保证,开展了电磁辅助弯曲成形方法的实验研究,通过拉伸和电磁成形实验探究了TA32钛合金的力学性能和成形性能,获得了TA32钛合金板在准静态和动态拉伸下的应力、应变关系,给出了在电磁成形状态下的成形极限应变,阐明了电磁成形作用下的TA32钛合金的增塑机制。采用匀压式电磁辅助弯曲成形的方法对TA32钛合金板开展实验研究,结果表明:电磁辅助弯曲成形方法能够有效地提高弯曲件的成形精度,并且在一定条件下,放电能量越高,贴模效果越好、成形精度越高。带压紧翼的弯曲件的变形区外层过度伸长而产生减薄并开裂,不带压紧翼的弯曲件通过合理地控制放电电压能够获得较好的成形效果。

Experimental study on formability and electromagnetic-assisted bending for TA32 titanium alloy sheets

Due to the poor formability of TA32 titanium alloy sheets at room temperature and the difficulty to ensure accuracy,the experimental study on electromagnetic-assisted bending method was carried out,and the mechanical properties and forming properties of TA32 titanium alloy were explored by tensile and electromagnetic forming experiments to obtain the stress-strain relationship of TA32 titanium alloy sheet under quasi-static tensile and dynamic tensile.Then,the forming limit strain in the state of electromagnetic forming was provided,and the plasticizing mechanism of TA32 titanium alloy under electromagnetic forming was clarified.Furthermore,TA32 titanium alloy sheet was studied by the uniform pressure electromagnetic-assisted bending method.The results show that the electromagnetic-assisted bending method effectively improves the forming precision of bending parts,and the higher the discharge energy under certain conditions is,the better the sticking effect to mold and the higher the forming accuracy are.In addition,the outer layer of deformation zone for the bending part with the compression wing is excessively elongated to produce thinning and cracking,and the bending part without the compression wing obtains better forming effects by reasonably controlling the discharge voltage.