The invention provides an ultra-large
turbine disc
forge piece precision subarea die
forging forming method which comprises the following steps that 1, ultra-large
turbine disc
forge piece forming is divided into two areas including a center hub radial plate area and an outer side radial plate rim area, the center hub radial plate area is mainly formed through pre-
forging, and the outer side radial plate rim area is mainly formed through final
forging; secondly, based on the first step, a pre-forging cavity is designed, and a center hub, a radial plate area, an outer side radial plate and a rim area are precisely formed; 3, a finish forging cavity is designed and comprises a center hub, a radial plate area, an outer side radial plate and a rim area; 4, on the basis of the steps, through analog
simulation, the shapes and sizes of the pre-forging die and the finish-forging die are adjusted according to the ultra-large
turbine disc
forge piece filling and forming load conditions; and 5, the forming process of the ultra-large turbine disc forge piece is simulated and analyzed, and it is ensured that the pre-forging forming load and the finish-forging forming load are both lower than 800 MN. The problems of high forming load, large
machining allowance and the like during traditional forging of the ultra-large turbine disc forge piece are effectively solved.