铝锂合金飞机蒙皮滚弯成形试验研究

目的对第三代铝锂合金材料进行滚弯成形研究。方法对第三代铝锂合金2060-T8板料按照国标进行单拉试验,建立材料的本构模型,在此基础上采用滚弯解析计算与小件工艺试验对铝锂合金材料2060-T8的滚弯成形曲线进行了拟合,并根据曲线设计铝锂合金滚弯工艺参数,将工艺参数直接应用于实际零件的成形。结果由于大零件与小零件存在尺寸效应与各向异性的差别,设计的上辊下压量参数与实际零件的下压量存在一定的偏差,但偏差小于1 mm。结论通过解析计算与小件工艺试验对铝锂合金滚弯工艺参数进行设计的方法,对实际零件的成形过程有很好的指导作用,可以将该设计方法应用于实际零件的生产。

Experimental Study on Roll Forming of Al-Li Alloy Aircraft Skin

Objective To study the roll forming of third-generation Al-Li alloy. Methods The constitutive model of the third-generation Al-Li alloy 2060-T8 was established via standard uniaxial tensile test. The roll forming curve of Al-Li alloy 2060-T8 was fitted by analytical calculation and roll forming test of small specimens based on the material constitutive model. The roll forming parameters of Al-Li alloy were designed according to the forming curve and directly applied for the actual part forming. Results The designed press displacement of the top-roller was different from the displacement for the actual part forming because of the dimensional effect and the blank anisotropic, but the difference was less than 1 mm. Conclusion Design of process parameters via analytical calculation and roll forming test of small specimens is a good guidance for actual parts forming process. This design method is applicable for actual parts fabrication.