The hydraulic transmission of injection molding machines uses hydraulic oil as the working medium, utilizing the pressure energy of hydraulic oil within the sealed working volume to transmit energy, power, or signals. The quality of hydraulic oil and seals directly affects the stable operation of the hydraulic system and indirectly affects product quality. To prevent and reduce faults in the hydraulic system, reduce wear, and extend service life, we should strictly use and maintain hydraulic oil.
Generally speaking, 70% of hydraulic device failures are caused by incorrect or improper use and maintenance of hydraulic oil. Maintaining good maintenance habits and preventive maintenance is the most effective way to reduce and prevent hydraulic failures in machines. So the precise maintenance and upkeep of hydraulic oil and hydraulic system is crucial. Therefore, it is necessary to introduce the characteristics and requirements of hydraulic oil.
The most important performance of hydraulic oil is viscosity and cleanliness, as well as good anti-oxidation, anti-wear, Anti Foam, anti-corrosion and good lubrication performance. The viscosity of hydraulic oil is expressed as the average of the kinematic viscosity at a temperature of 40 ℃. The commonly used 46 # anti wear hydraulic oil (46csT/40 ℃) refers to the average kinematic viscosity of this hydraulic oil at a temperature of 40 ℃, which is 46m2/S. The relationship between hydraulic oil viscosity and pressure and temperature is as follows: as the temperature increases, the viscosity decreases; As the pressure increases, the viscosity increases. Regular testing of hydraulic oil performance. If the oil is contaminated or deteriorates, the lifespan of the injection molding machine will shrink and malfunction may occur. Therefore, it is necessary to regularly test the oil to detect changes in its performance. Based on this, decide whether to change the oil. We can use a simple visual method (preferably using a professional laboratory to detect data values if conditions permit) to understand the condition of the oil: Appearance testing. Place the new oil sample and the old oil sample in use into their respective test tubes, compare their color, clarity, presence of floating substances, and water precipitation at the bottom of the test tube. Dropping test. Drop the old oil onto the filter paper (absorbent sheet) and observe after 1 hour. If the oil is dirty or visibly spoiled, pollutants will be easily observed. Finger friction. Rub the old oil in use on your fingers. If the viscosity decreases and deteriorates, the feel will be rough and there will be no thickening sensation. The oil droplets fall smoothly from the fingers without any thickening or rebound.
