Forging hydraulic press is a hydraulic transmission technology for pressure processing equipment, which can be used to complete various forging and pressure forming processing. Forging hydraulic press is one of the machinery that applies hydraulic transmission, and hydraulic transmission has become the main transmission form of pressure processing machinery.
The hydraulic transmission system of forging hydraulic press is mainly based on pressure transformation, with high system pressure, large flow and high power. Therefore, special attention should be paid to improving the power utilization of the prime mover and preventing shock and vibration during pressure relief.
According to the pressing process, the main cylinder of the forging hydraulic press can complete the basic working cycle of rapid downward movement, deceleration, compression, pressure holding, rolling time, pressure relief and return stroke (any position), and the pressure, speed and pressure holding time need to be adjustable. The ejection hydraulic cylinder is mainly used to eject the workpiece, and it is required to be able to realize the action of ejection, retraction and stop. For example, when the thin plate is stretched, it is required to eject the auxiliary actions such as the rising, stopping and pressure return of the hydraulic cylinder. Sometimes it is also necessary to press the blank with an edge cylinder to prevent wrinkling around the perimeter. The pressure (tonnage) that may be output by the main actuator (master cylinder) in the main motion of the hydraulic press is the main specification of the hydraulic press, and it has been serialized. The tonnage of the ejector cylinder is often 20%-50% of the tonnage of the main cylinder. The ejector cylinder of the extruder can be about l0% of the main tonnage. The tonnage of the crimping cylinder of the double-acting stretching hydraulic press is generally about 60% of the tonnage of the tensile cylinder. The speed of the master cylinder is determined by the pressure processing technology, generally in the hydraulic system directly supplied by the pump, the working stroke speed does not exceed 50mm/s, the rapid traverse speed does not exceed 300mm/s, and the rapid retreat speed is equal to the rapid forward speed.