Hydraulic press machine working medium
Hydraulic press machine used in the role of the working medium pressure not only passed, but also to ensure working parts of the machine work is sensitive, reliable, long life and low leakage.
Hydraulic presses for working medium of the basic requirements are:
1. a suitable fluidity and low compressibility, in order to improve the efficiency of the transmission;
2. can prevent rust;
3. have good lubricating properties;
4. easy to seal;
5. stable, long-term work without deterioration. ”
Hydraulic press machines are initially water as the working medium, after the switch adding a small amount of emulsified oil in water emulsion formed in order to increase lubricity and reduce corrosion. Appeared in the late 19th century, with mineral oil as the working medium of the hydraulic machine. Oil has good lubricity, corrosion resistance and moderate viscosity, improves the performance of the hydraulic machine. the half of 20th century the emergence of new water-based emulsion, the emulsion form is the “water in oil” instead of the original “oil in water.” “Water in oil” emulsion, the outside looks as an oil, its lubricity and corrosion resistance close to the oil, and the the oil content small, easy to burn. But the water-based emulsion expensive, limiting its promotion.
