There will be five harm if the temperature of the injection molding machine is high…
1.It will make machinery be out of shape under heat. 2.It will reduce the viscosity of oil. 3.It will make rubber sealing element out of shape. 4.It will speed up fat liquor oxidation and metamorphism. 5.It will reduce the air point pressure.
Firstly. It will make machinery be out of shape under heat.
Some moving parts of hydraulic components in different thermal expansion coefficient will be stuck because of the shrink of coordinate gap.It will cause movement failure and influence the transmission accuracy of hydraulic system.
As a result,the working quality of parts will be worse.
Secondly. It will reduce the viscosity of oil.
Too high temperature of injection molding machine will make the viscosity of oil reduce and increase disclosure.The volume efficiency of the pump and the efficiency of whole system will reduce obviously.Because of the drop of the viscosity of oil,the oil film of moving parts like slide valve will be thin and be cut through.Then it makes frictional resistance increase.Finally,abrasion rises.
Thirdly.It will make rubber sealing element out of shape.
Too high temperature of injection molding machine will make rubber sealing element out of shape,speed up aging and failure,reduce sealing performance and using life.As a result,disclosure increases.
Fourthly,It will speed up fat liquor oxidation and metamorphism.
Too high temperature of injection molding machine will speed up fat liquor oxidation and metamorphism,separate out bituminous substances and reduce the using life of hydraulic oil. Precipitates blocks damping orifice and slit valve port that leads pressure valve to be stuck and not to move.At the same time metal piping will extend and rupture.
Fifthly,it leads the working quality of parts to get worse.
Too high temperature of injection molding machine will leads the working quality of parts to get worse.The air escapes which dissolved in oil,then produce capitation. The result is that hydraulic system work performance will reduce.
The ideal working temperature of hydraulic system is between 45°C and 50°C .The reason is that hydraulic system is designed by selected viscosity of oil.However,the level of viscosity will change by the oil temperature, thereby affecting work elements in the system,such as cylinders, hydraulic valves.It leads control accuracy and response sensitivity to reduce.It is especially for precise injection molding machine.
At the same time,too high temperature will accelerate the sealing element aging, hardening and chipping.Too low temperature leads working energy consumption to go up,so that the operating speed is lowered.So it is necessary to pay close attention to the working temperature of hydraulic oil.There are various reasons for high oil temperature.But it is mostly attributed to the failure of oil cooling system failure and so on.
Approaches to high temperature of injection molding machine.
1. Depending on the different load requirements, always check and adjust the pressure of the relief valve to make it just right.
2. Improve lubrication of moving parts is good to reduce friction losses and help to reduce the workload and reduce fever.
3. Improve assembly quality and the accuracy of hydraulic components and hydraulic systems.Controlstrictly with the gap to fittings and improve lubrication conditions. Using small coefficient of friction sealing materials and improving sealing structure.As much as possible to reduce the driving force of the hydraulic cylinder, in order to reduce the heat which is generated by mechanical friction losses.
4.When it is necessary,add a cooling device.