Panel liquid-filling drawing forming system based on independent bag pressure regulation and forming method of panel liquid-filling drawing forming system

The invention discloses a plate hydraulic deep drawing forming system based on independent bag pressure regulation and a forming method of the plate hydraulic deep drawing forming system, and belongs to the field of plate hydraulic forming. The forming method comprises the steps that liquid is injected into a female die liquid pool, a blank is placed on a female die, and after the die is closed, a hydraulic system is started to achieve plate pre-expansion; the male die begins to move downwards, and liquid in a liquid pool and a medium in a pressure control bag connected with the liquid pool are extruded; when the male die continues to move downwards and the pressure rises to a set value of the independent bag mechanism, the volume of nitrogen in the independent bag is reduced due to compression, liquid in the liquid pool is extruded into the independent bag, meanwhile, the pressure of the liquid is slowly increased in a small range, and a pressure loading curve is controlled through the independent bag; and t