Hydraulic System Requirements and Analysis of Hydraulic Presses

The hydraulic press is a device that uses hydraulic transmission technology for pressure processing and can be used to perform various forging and press forming processes. For example, forging of steel, molding of metal structural parts, pressing of plastic products and rubber products. Hydraulic press is one of the first machines to apply hydraulic transmission. At present, hydraulic transmission has become the main transmission form of pressure processing machinery. Hydraulic machines have become important equipment in the heavy machinery manufacturing industry, the aerospace industry, the plastics and non-ferrous metal processing industries.

The hydraulic transmission system of the hydraulic machine 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 when the pressure is released.

According to the pressing process, the hydraulic machine can complete the basic downward working speed of the rapid deceleration pressing, pressure holding delay, and the pressure, speed and holding time can be adjusted. And it is required to perform the actions of ejecting, retreating, and stopping. For example, when the thin plate is stretched, an auxiliary action of ascending, stopping and pressure returning of the hydraulic cylinder is required. Sometimes it is necessary to press the blank with a crimping cylinder to prevent wrinkles in the periphery.

Since the pressure processing process needs to determine the speed of the master cylinder, in the hydraulic system directly supplied by the pump, the working stroke speed does not exceed 50 mm/s, the fast forward speed does not exceed 300 mm/s, and the retraction speed is equal to the fast forward speed.