Supporting pressure closed-loop control system and method for hydraulic forging press

The invention discloses a supporting pressure closed-loop control system and method for a hydraulic forging press. The supporting pressure closed-loop control system comprises a pressure sensor, a programmable logic controller and a proportional servo valve. The pressure sensor is used for collecting a sliding block supporting pressure datum in a sliding block oil cylinder lower cavity. The programmable logic controller compares the input oil cylinder pressure datum with a set supporting pressure datum and outputs a control instruction through a modified proportion integration differentiation (PID) control algorithm. The proportional servo valve is used for receiving the control instruction to achieve control over the supporting pressure of the sliding block lower cavity of the hydraulic forging press. An input port of the programmable logic controller is in electric connection with the pressure sensor. An output port of the programmable logic controller is in electric connection with an input terminal of the proportional servo valve. According to the supporting pressure closed-loop control system and method, the modified PID control algorithm is led into the pressure closed-loop control system of forging, so that the stability of the sliding block supporting pressure of the hydraulic forging press at different tonnage and working speed is improved.