Abstract: Incremental forming technology has the characteristics of short produce development cycle, low cast and high process flexibility, which can meet the production requirements of small batch customized parts. However, its own characteristics make the sheet have problems such as poor accuracy and limited forming performance during the forming process at room temperature. In view of the fact that the electric pulse has the effect of reducing the deformation resistance of the metal and improving the plastic deformation ability. Therefore, the electric pulse is applied to the incremental forming process of 2A12 aluminum alloy sheet. By designing the response surface method experiment, the influence of current parameter and traditional incremental forming process parameters on the forming limit of aluminum alloy plate is explored. The results show that the introduction of electric pulse improves the forming limit of aluminum alloy sheet and enhances its formability. And within a certain range, as the increase of current, the sheet forming performance is better. Based on the optimization of process parameters, the final forming height of the variable angle conical part reaches 27.80 mm, and the forming limit angle reaches 88.04°. Compared with the traditional incremental forming parts, the height of the parts is increased by 7.90 mm, an increase of 39.70%; the forming limit angle is increased by 13.11°, an increase of 17.50%. The combination of electric pulse and incremental forming technology can significantly improve the forming limit of aluminum alloy materials and promote the development of aluminum alloy forming process, which has important theoretical significance and engineering value.

Key words: incremental forming, pulse power supply, 2A12 aluminum alloy plate, response surface method