In the process of the screw press dewatering machine, the screw and the nut are mainly used as the transmission mechanism, and the forward and reverse rotation motion of the flywheel is converted into the forging and rolling machine of the slider by the screw transmission. During operation, the motor accelerates the flywheel to save energy, while pushing the slider down through the screw and nut. When the slider contacts the workpiece, the flywheel is forced to decelerate to a complete stop, and the stored rotational kinetic energy is converted into impact energy, and the workpiece is struck by the slider to deform it. After the end of the blow, the motor reverses the flywheel and drives the slider up to return to the original position. The specifications of the screw press are expressed by the nominal working force.
The dewatering screw press usually drives the flywheel wheel by the friction disk to rotate the flywheel. Therefore, this press is also called a friction press. The larger friction press in China is 25 trillion. The larger size of the screw press uses a hydraulic system to drive the flywheel, called a hydraulic screw press, with a large size of 125 megatons. Later, there was an electric screw press that directly driven the flywheel with a motor. It has a compact structure and few transmission links. Due to frequent commutation, the control electric appliance is required to be high, and a special motor is required.
The dewatering screw press has no fixed bottom dead center. For larger die forging parts, it can be formed by multiple times, and can be single, continuous and inching. The striking force is related to the amount of deformation of the workpiece. When the deformation is large, the striking force is small, and when the deformation is small (such as a cold blow), the striking force is large. In these respects, it is similar to a hammer.