The way the movement is converted from the motor to the vertical movement of the plunger can be divided into four types of screw presses. There are friction drives, direct electric drives, indirect electric drives and hydraulic drives. Typically (though there are exceptions) the flywheel is attached directly to the vertical screw of the press. When the driver engages and rotates the flywheel, the screw connected to the plunger by the nut rotates and the plunger is driven towards the workpiece. In a typical operation, there is only one blow per forging operation. For some modern applications and drive systems, multiple hits can occur.
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