2060-T8铝锂合金槽形件的电辅助增量成形

Electrically-Assisted Incremental Sheet Forming Process for 2060-T8 Al-Li Alloy

设计并搭建了电辅助增量成形试验平台,通过2060-T8铝锂合金槽形试样的电辅助单点增量成形试验研究了脉冲电流对成形试样的轮廓精度和壁云厚分布等成形效果的影响规律.结果表明:在电辅助增量成形过程中,因脉冲电流而产生的电致塑性效应,会促使材料变形的局部化,从而提高了板料的成形能力;在所用试验条件下,随着电流密度增加,试样的轮廓度误差以及成形区域的减薄率先减小而后增加;当电流密度为9.5A/mm^2时,试样的成形效果最佳.

An experimental platform for electrically-assisted incremental sheet forming （E-ISF） was de- signed and built in this paper. Influence of pulse current on geometric accuracy and wall thickness distribu- tion of specimens in E-ISF were studied. The research results demonstrate that, electroplastic effect gener- ated by pulse current can promote local deformation and improve Iormability in E-ISF process. With in- creasing pulse current density, the geometric errors and reduction ration of thickness in forming area in- crease at first and then decrease. The best forming result is achieved under pulse current density of 9.5 A/ mm2 .