How to preventive maintenance and maintenance of injection molding machine?


Under the premise of selecting the correct injection mo […]

Under the premise of selecting the correct injection molding machine model, regular preventive maintenance is an effective way to ensure the normal operation of the injection machine. The so-called preventive maintenance is a series of preventive work and inspections to avoid machine failures and extend the working life of various parts. For example, turning a sudden failure that causes a shutdown into a predictable and planned shutdown repair or overhaul; can be timely The discovery and replacement of damaged parts can prevent intermittent damage, etc. are the purpose of preventive maintenance.
1. Hydraulic oil volume
Insufficient amount of oil will cause the temperature of the oil to rise easily, and air will easily dissolve in the oil, which will affect the normal operation of the oil quality and hydraulic system. Insufficient oil is usually caused by oil leakage or loss during repair. Parts, replace worn seals early, tighten loose joints, etc. After maintenance, check the amount of oil in the tank and replenish it in time.
2. Hydraulic oil temperature
The ideal working temperature of the hydraulic system should be between 45℃-50℃, because the hydraulic system is designed according to the viscosity of a selected pressure oil, but the viscosity will change with the oil temperature, which will affect the work in the system Components, such as oil cylinders and hydraulic valves, reduce the control accuracy and response sensitivity, especially for precision injection machines. At the same time, if the temperature is too high, it will accelerate the aging of the seals, causing them to harden and crack; if the temperature is too low, the processing energy consumption will be large, and the running speed will be reduced.Therefore, it is necessary to pay close attention to the working temperature of hydraulic oil. There are various reasons for the high oil temperature, but most of them are due to the failure of the oil circuit or the failure of the cooling system.
3. Hydraulic oil quality
One of the important properties of hydraulic oil is its chemical stability, namely oxidation stability. Oxidation is the most important factor in determining the effective service life of hydraulic oil. Insoluble materials such as wood tar, oil sludge and carbon residue generated by oxidation will contaminate the hydraulic system and increase the wear of hydraulic components, reduce various gaps,block small holes and eventually The hydraulic system is malfunctioning. The oxidation rate of hydraulic oil depends on many factors such as itself and working conditions, among which temperature is one of the main factors, so use suitable hydraulic oil and regularly check the oxidation degree of hydraulic oil (judging from the deep color of the oil itself) ), it is absolutely necessary to actively change the oil after a certain number of working hours.