Study of cone NC sheet metal incremental forming

The principle of NC incremental sheet metal forming as well as the process planning, experiment of cone forming are presented. Because the deformation of sheet metal only occurs around the tool head and the deformed region is subjected to stretch deformation and thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheet metal deformation. According to sine law, a cone with θ smaller than limit half-apex angle can´t be formed by NC incremental sheet metal forming process in a single process, rather, it must be formed in multi processes. Thus, the multi time path process method is presented to form the cone, and the experiment is made to verify it. A cone can be formed from a sheet metal in NC incremental forming process by choosing appropriate tool-path planning. The fracture in the forming component can be avoided by these methods. A cone of uniform wall-thickness can be formed by NC incremental forming process.