The die movement and degree of freedom of forging equipment are inconsistent. According to the characteristics of deformation limitation of bottom dead point, forging equipment can be divided into the following four forms:  

1, limited forging force form: oil pressure direct drive slider hydraulic press.  

2. Quasi-stroke limit: hydraulic press driven by crank and connecting rod mechanism.  

3, stroke limit mode: crank, connecting rod and wedge mechanism to drive the slider mechanical press.  

4. Energy limit: Screw and friction press with screw mechanism.