Study of fender NC incremental sheet metal forming

The principle of NC incremental sheet metal forming and the forming process of the fender are introduced. The effect of process parameters on forming is analysed. The improvement method of the forming quality is suggested. It is important that NC incremental sheet metal forming technology is perfected. The NC incremental sheet metal forming technology is a flexible forming technology without dedicated forming dies. The forming locus of the forming tool can be adjusted by correcting the numerical model of the product. Because the deformation of sheet metal only occurs around the tool head and the deformed region is subjected to stretch deformation, the deformed region of sheet metal thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheet metal deformation. The forming half-apex angle θ and feed pitch p are the main process parameters in NC incremental forming of fender. According to sine law, it will succeed in fender incremental forming in a single tool-path if the forming is carried out with an angle which is larger than the forming limit half-apex angle. In this study, we get the following result through calculation: θ=30°. The feed pitch p increase, the process time decrease, production rate and surface degree of roughness increase. In general, the feed pitch is 0.25mm.