When the volute screw press is made, the screw and the nut are mainly used as the transmission mechanism. When the operation is performed, the forward and reverse rotation motion of the flywheel is converted into the forging and reversing motion of the slider by the screw transmission. In operation, the motor accelerates the flywheel to save energy, while pushing the slider downward through the screw and nut.
When the slider touches 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 screw press usually uses the motor to drive the flywheel rim through the friction disc to rotate the flywheel. Therefore, this press is also called a friction press. The larger size volute screw press drives the flywheel with a hydraulic system called a hydraulic screw. The press has a maximum size of 125 megatons. Later, an electric screw press that directly drives the flywheel with a motor appeared. 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.