Electromagnetic superposed forming of large-scale one-dimensional curved AA2524-T3 sheet specimen

摘要

Limited by strength of electromagnetic coil, discharging energy of capacitor bank and some other auxiliary tools, electromagnetic forming (EMF) researches are mainly focused on regular size specimens. This paper demonstrates forming procedure of a large size AA2524-T3 sheet specimen with one-dimensional curvature, which expands application of electromagnetic force and intends to explore a new forming technology for aircraft skin manufacturing. It is based on the superposition of shallow local dome-shaped and bowl-shaped deformations which are generated by a coaction of electromagnetic driving force and punch matrix restraining. The results show that the sheet in size of 1840 mm x 810 mm x 2.5 mm is formed to be a macroscopically one-dimensional curved specimen. Curvature radius of the specimen varies from 6115.4 to 6328.3 mm. The maximum deflection of the specimen reaches 79.4 mm. Feasibility of this method in forming specimen with large size and one-dimensional curvature is verified.