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What are the hazards of the injection molding machine temperature rising too high

Update:15-01-2022
Summary:

If the temperature of the injection molding machine is […]

If the temperature of the injection molding machine is too high, the viscosity of the oil will decrease, the leakage will increase, and the volumetric efficiency of the pump and the efficiency of the entire system will be significantly reduced. As the viscosity of the oil decreases, the oil film of the moving parts such as the spool valve is thinned and cut, and the frictional resistance increases, resulting in increased wear. This will shorten the service life of the machine.
If the temperature rise of the injection molding machine is too high, the working quality of the components will be deteriorated, the dissolved air in the oil will overflow, and air pockets will be generated, which will reduce the working performance of the hydraulic system and reduce the working efficiency of the injection molding machine. The ideal working temperature of the hydraulic system should be between 45-50 degrees, because the hydraulic system is designed according to the selected pressure oil viscosity, but the viscosity will change with the oil temperature, which will affect the working elements in the system. Such as oil cylinders, hydraulic valves, etc., the control accuracy and response sensitivity are reduced. At the same time, if the temperature is too high, the aging of the seal will be accelerated, causing it to harden and crack; if the temperature is too low, the processing energy will be consumed and the running speed will be reduced. Therefore, it is necessary to pay close attention to the working temperature of the hydraulic oil. There are various reasons for the high oil temperature, but most of them are attributed to the failure of the oil circuit or the effectiveness of the cooling system.
If the temperature rise of the injection molding machine is too high, it will accelerate the oxidation and deterioration of the oil, precipitate asphalt substances, and reduce the service life of the hydraulic oil. The precipitates block the damping holes and the slit valve ports, causing the pressure valve to be stuck and unable to operate, the metal pipeline to stretch and bend, or even rupture.
Approach:
(1) According to different load requirements, check and adjust the pressure of the relief valve frequently to make it just right.
(2) Reasonable selection of hydraulic oil, especially oil viscosity, when conditions permit, try to use a lower viscosity to reduce viscosity friction loss.
(3) Improve the lubrication conditions of moving parts to reduce friction loss, which is beneficial to reduce workload and reduce heat generation.
(4) Improve the assembly quality and precision of hydraulic components and hydraulic systems, strictly control the fitting clearance of fittings and improve lubrication conditions. The sealing material with small friction coefficient and the improved sealing structure are used to reduce the starting force of the hydraulic cylinder as much as possible, so as to reduce the energy generated by the mechanical friction loss.
(5) Add cooling device if necessary.

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