Abstract: Aiming at the pushing high-speed forging hydraulic press, the frictional resisting torque and friction radius of supporting spherical hinge in the working cylinder is analyzed, the supporting spherical hinge’s side thrust to the working cylinder’s plunger with single and double spherical hinges structures is studied and influencing factor of hydraulic press’ structure parameter to the plunger’s side thrust is determined. By synthesizing the structure influences of working cylinder, supporting spherical hinges and movable beam, the conditions the forging eccentricity should meet when the movable beam is in rotating self-locked condition and the internal relations between hydraulic press’ structure parameter and movable beam’s self-locked condition can be determined. Base on the structure parameter of domestic pushing high-speed forging hydraulic press and some import devices, the forging eccentricity that meets the movable beam’s self-locked conditions is calculated and the working conditions of movable beam in eccentric forging and the effect of working cylinder’s supporting spherical hinge in the hydraulic press’ operation is analyzed. By simulated analysis, the movable beam’s rotating self-locked condition in eccentric forging is further verified to provide theoretical basis to the research of large scale double column free forging hydraulic press and the optimization design of medium and small scale hydraulic press.

Key words: high-speed forging hydraulic press;mainframe;movable beam;rotating self-locked condition