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How to choose the injection molding machine hydraulic oil use

by:Hisson     2020-10-19
Machine hydraulic system can work normally, in addition to the reasonable design of system and components manufacturing quality and maintain the use conditions, the hydraulic oil has applicability cleanliness is a very important factor. Hydraulic oil as the working medium of hydraulic transmission, in addition to energy transfer, lubrication and protect metal from being corroded components movement parts of the role. Especially in the current hydraulic technology constantly to high pressure, integration, miniaturization, and the application of electronic technology, the hydraulic system working reliability, sensitivity, stability, and life is put forward out the high probability of high demand, therefore, the injection molding machine hydraulic system should be chosen good performance, high cleaning machine hydraulic system can work normally, in addition to the reasonable design of system and components manufacturing quality and maintain the use conditions, the hydraulic oil has applicability cleanliness is a very important factor. Hydraulic oil as the working medium of hydraulic transmission, in addition to energy transfer, lubrication and protect metal from being corroded components movement parts of the role. Especially in the current hydraulic technology constantly to high pressure, integration, miniaturization, and the application of electronic technology, the hydraulic system working reliability, sensitivity, stability and life raised out the high probability of high requirement, therefore, should choose the good performance of injection molding machine hydraulic system, has the high cleanliness of hydraulic oil. Relevant data statistics show that more than 70% of the hydraulic system failure is due to the inappropriate selection of hydraulic oil or use, improper safekeeping, caused by the pollution of hydraulic oil. Therefore, must understand the requirements of the hydraulic system for oil, reasonably choose, right in the maintenance of custody, to ensure the normal operation of hydraulic system, less out of order, improve production efficiency. A, the requirement and the choice of the hydraulic oil ( 1) Proper viscosity and good viscosity-temperature characteristics. If the hydraulic oil viscosity is too large, the system pressure loss is big, sheep efficiency is reduced, and increased wear and tear, reduce the service life of the pump; If the hydraulic oil viscosity is too small, then the system is easy to leak, the performance of the system is reduced, therefore, the hydraulic oil viscosity to choose reasonable, not big also not small. Hydraulic oil viscosity will vary with the change of the temperature changes, temperature, viscosity of hydraulic oil. Oil viscosity with temperature changes in the performance of viscosity-temperature characteristics, commonly used viscosity index said. The higher the viscosity index, oil viscosity-temperature characteristics, the better, the temperature changes, the viscosity changes small. The hydraulic oil viscosity index should be generally higher than 90. ( 2) In the working temperature and pressure, with good lubricity, shear stability, and a certain number of oil film strength. Hydraulic system components are always to friction and wear, the machine stops and starts, the friction force is bigger, startup friction to the maximum, easy cause wear and tear. Therefore, the hydraulic oil to have good lubricity, lubrication to the moving parts, achieve the goal that reduce wear and prolong service life. Work under the condition of high temperature and high pressure, high speed of the hydraulic system, more requirements hydraulic oil to have good lubricity, which have high oil film strength, abrasion resistance is better. Hydraulic oil through some valve mouth, holes, cracks subjected to strong shearing action, in this case, a larger molecules will break, into smaller molecules, the cause of the oil viscosity is reduced, when reduced to a certain degree, the hydraulic oil cannot reoccupy, therefore, the hydraulic oil should be has good resistance to shear stability.
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