When using a four-column hydraulic press, you should pay attention to the viscosity of the hydraulic oil.

            One of the important indicators for testing the performance of hydraulic oil in a hydraulic machine is its viscosity. High-quality hydraulic oil can make the system of a four-column hydraulic press run very stably and efficiently. It is easy to operate, has good sensitivity, and has low power consumption. Relatively speaking, If the hydraulic oil does not meet the regulations, it will cause the temperature of the four-column hydraulic machine to rise, wear and tear of components and cavitation. For example, when the viscosity of the hydraulic oil is relatively thick, it will cause the four-column hydraulic machine factory oil to deteriorate. The flow resistance increases and the speed slows down, which not only increases the power consumed but also causes certain losses due to wear.

1. Good viscosity-temperature properties

       When the hydraulic system is working, the oil temperature increases with pressure loss. If the viscosity-temperature performance of the hydraulic oil is poor, the viscosity will be significantly reduced, leading to poor lubrication and leakage, affecting working accuracy. If the hydraulic system starts due to increased viscosity in winter, it will affect starting. Therefore, the viscosity change range should be smaller within the operating temperature range. The temperature index of hydraulic oil is generally above 90.

2. Good rust resistance

       When hydraulic equipment is parked or stored for a long time, hydraulic components are prone to rust, and hydraulic oil is required to have good anti-rust properties.

3. Good antioxidant properties

       When the hydraulic system is working, as the oil temperature gradually increases, the oil becomes more and more susceptible to oxidation and deterioration. Especially at high temperatures, the oxidation rate is very fast. Oil oxidation will produce sludge deposits, pollute the system, and even affect the normal operation of the system.

4. Good emulsification resistance

       If water is mixed into the hydraulic oil, substances with poor stability in the hydraulic oil will produce hydrophilic organic acids and soaps, which will emulsify under the agitation of the pump, reduce lubricity, and affect the working performance of the pump and valves.

5. Good anti-foaming performance.

       If the hydraulic oil is foamy, it will cause crawling and noise in the hydraulic system.

6. Good lubrication performance

       The fitting clearance of the moving parts of the hydraulic components is very small. Generally speaking, in order to increase the service life of components, a high-strength oil film needs to be formed on the moving surface to form liquid lubrication and reduce wear.

7. Freezing point

       It is required that the freezing point of the hydraulic oil should be 10C lower than the low ambient temperature. Otherwise, the temperature will be too low and the oil level will increase, affecting startup or even not working.