A hydraulic press is a machine that uses liquid as a working medium and is made according to the Pascal principle to transfer energy to realize various processes. The hydraulic machine is generally composed of three parts: the machine (host), the power system, and the hydraulic control system. Hydraulic presses are classified into valve hydraulic presses, liquid hydraulic presses, and engineering hydraulic presses. Hydraulic presses are often used in the pressing process and the forming process, such as forging, stamping, cold extrusion, straightening, bending, flanging, sheet drawing, powder metallurgy, pressing, etc. The first hydraulic press of 10,000 tons manufactured in my country is a free forging hydraulic press.
Development history of the hydraulic press:
In 1795, J. Brammer of the United Kingdom invented a hydraulic press using the Pascal principle, which was used to pack and squeeze vegetable oil. By the mid-19th century, Britain began to use hydraulic presses for forging, which gradually replaced super-large steam forging hammers. By the end of the 19th century, the United States made 126,000 kN free forging hydraulic presses. Since then, the world has manufactured more than 20 100,000 kN free-forging hydraulic presses, of which 2 are made in China (see color picture). With the emergence and improvement of electric high-pressure pumps, forging hydraulic presses have also developed towards smaller tonnages. After the 1950s, a small rapid forging hydraulic press appeared, which could perform the work equivalent to 30-50 kilonewton forging hammers. In the 1940s, Germany made a giant die forging hydraulic press of 180,000 kN. Since then, 18 die forging hydraulic presses of more than 180,000 kN have been made in the world, of which one made in China is 300,000 kN.
Hydraulic machine use:
A hydraulic press is a machine that uses liquid as a working medium to transfer energy to achieve various processes. In addition to being used for forging and forming, hydraulic presses can also be used for straightening, pressing, packing, pressing blocks and pressing plates. Hydraulic presses include hydraulic presses and hydraulic presses. The water-based liquid as the working medium is called the hydraulic press, and the oil as the working medium is called the hydraulic press. The specifications of hydraulic presses are generally expressed in terms of nominal working force (kN) or nominal tonnage (ton). The hydraulic presses used in forging are mostly hydraulic presses with high tonnage. In order to reduce the size of the equipment, large forging hydraulic presses usually use higher pressures (about 35 MPa), and sometimes ultrahigh pressures above 100 MPa are also used. Hydraulic presses for other purposes generally use a working pressure of 6-25 MPa. The hydraulic press has a lower tonnage than the hydraulic press.