Abstract: For resolve the problem of flash generation in multi-way active loading forming，a mould with surface splitting mold is developed. Based on the shell parts with branch, by optimize the length, width and taper of the mould, the conditions of flash generation and their uniformity of deformation are analyzed, the curve of the maximum loading is obtained. Combined the filling simulation, obtained the optimal structural parameters, and mold structure design criteria for multi-way active loading, which provides a theoretical basis for reduce the flash or avoid the generation of flash in the active loading or forging process. According to the simulation data to determine the trend of optimal multi mold structure parameters, the simulation results show, It has avoid the flash to produce in the bottom of shell, deformation uniformity, horizontal load is small, which are consistent with the expected results. Based on simulation, by experimental verification after design, the qualified branch of parts is formed, and its performance has exceeded the original requirements.

Key words: Active loading, Finite element method, Flash, Optimum design