Research on the Dynamic Characteristics of Hot Die Forging Press Controlled by Combined Wet Clutch-Brake

The combined wet clutch-brake has the advantages of quick action, security and reliability, and good time coordination, and it is a critical core component of big hot forging presses. In order to study the influence of friction torque characteristics of wet friction pairs on forging performance, the clutch brake torque transmission parameters were determined using the average Reynolds equation and the rough surface elastic contact model. AMESim and MATLAB/Simulink simulation platforms were used to build a dynamic co-simulation model for the transmission system of hot die forging press based on the hydraulic control principle of the combined wet clutch-brake. The wet clutch-brake piston oil pressure, torque transmitted by the wet clutch-brake, and crankshaft speed were all analyzed during the press’s operation. The simulation results show that by controlling the variation in the law of the piston oil pressure soft clutch, hard clutch, soft brake, and hard brake of the combined wet clutch-brake, the alternating variation of the clutch brake transmission torque is achieved, thereby controlling the speed and stroke of the hot forging press crankshaft, completing the five working stages of the press clutch, sliding, forging, return, and braking, and ultimately making the slider accurately stop at the top dead center. The research results of the study provide a theoretical framework and model foundation for the application research of combined wet clutch brakes on hot forging presses.