Influence of high and low temperature environment of hydraulic press on hydraulic oil performance

The effects of high and low temperature environment on hydraulic oil performance are:

High temperature environment of hydraulic press: high temperature makes the oil viscosity smaller, the viscosity is too low, the hydraulic system leaks or even the hydraulic system cannot work normally. High temperature intensifies the oxidation of the oil, and some copper, acid, gum, asphaltene and other substances are gradually formed in the oil, polluting the oil and shortening the service life of the oil. When the oil is oxidized to a certain extent, the oil fails and cannot be used.

Low temperature environment of oil press: Low temperature makes the viscosity of oil larger. The viscosity is too high, the self-priming capacity of the pressurized pump decreases, and the system pressure loss and power loss increase. It is generally believed that when the viscosity reaches 10mm2/s, the hydraulic system cannot work normally, and when the viscosity reaches 20mm2/s, the hydraulic system cannot start normally.

The high temperature of the hydraulic press often causes the corrosion of steel and other non-ferrous metals in the oil to intensify, resulting in surface damage of the parts and corrosion at the same time. High temperature is more likely to produce bubbles, the water in the oil is vaporized at high temperature, reaching 7K vapor, and the gas (mainly air) floating in the oil is volatilized due to high temperature and produces bubbles. Bubbles destroy the lubricating oil film, sintering the friction surface or increase wear, and oxidize the oil, affecting the accuracy and sensitivity of the hydraulic components, and can not meet the requirements of the use of the hydraulic system in serious cases; High temperature makes the performance of rubber seals in hydraulic system deteriorate, which can accelerate rubber aging and even seal failure; The high temperature of the hydraulic press causes the hydraulic oil volume to expand, causing the hydraulic pressure closed in the chamber to rise, causing danger.