Injection molding machine hydraulic system is the high injection molding machine
in the process of using common anomalies, one of the following is about the analysis of the causes of injection molding machine high temperature and processing method.
Tank volume is too small, the cooling area is not enough, cooling device, but its capacity is too small. 2)
According to fast-forward speed choice pump capacity metering pump oil supply system, in the work when they have most of the excess flow at high pressure and heat from the relief valve discharge.
Unloading loops in the system failure or not set unloading circuits, to stop work when the pump not unloading, all the flow at high pressure pump overflow, overflow losses and fever, cause temperature rise.
Bending system pipeline to go too long, too much, local pressure loss and the frictional pressure loss is big.
Components precision insufficient and poor quality of assembly, relative movement between the mechanical friction loss is big.
The mating parts fit clearance is too small, or use wear causes the clearance is too large, large amount of internal and external leakage, causing volume loss, such as the volumetric efficiency of the pump is reduced, temperature rising fast.
The hydraulic system pressure is much higher than actual needs adjustment.
Sometimes it is because of sealed tight, or because of the increased seal damage, leakage had to raise the pressure to work.
Climate and the working environment temperature is high, the oil temperature is high.
Improper choice of oil viscosity, the viscosity viscous resistance is big, the viscosity is too small leakage, two cases can cause heating temperature.
The harm of injection oil temperature rise too high � � 0 21)
Make the machinery to produce thermal deformation, thermal expansion coefficient of different moving parts in hydraulic components due to its smaller fit clearance card does, cause action failure, affect the hydraulic system of transmission precision, deterioration in quality parts work.
Make the oil viscosity is reduced, leakage increase, the volume of the pump efficiency and the efficiency of the whole system will be significantly reduced.
As a result of the oil viscosity is reduced, valve and other moving parts of the oil film thinning and cut broken, frictional resistance increases, lead to wear and tear.
Make the deformation of rubber seals, accelerated aging failure, reduce the sealing performance and using life, cause leakage.
Accelerate the oil oxidation and precipitation asphalt material, reduce the service life of hydraulic oil.
Precipitates jam the damping holes and cracks type valve, causing pressure valve card does not move, the metal pipe elongation and bending, and even rupture, etc.
Reduce oil separation of air pressure, air dissolved in transformer oil escape, produce cavitation, the working performance of hydraulic system.
Injection molding machine oil temperature rise too high processing method � � 0. 21)
According to different load requirements, check and adjust the pressure relief valve, make it right.
Choose the hydraulic oil, especially oil viscosity, in conditions allow, as far as possible with lower viscosity in order to reduce viscosity friction loss.
Improve the lubrication conditions of moving parts, in order to reduce friction loss, is helpful to reduce the work load, reduce fever.
Improve the assembly quality of hydraulic components and hydraulic system and its accuracy, strictly control the mating parts fit clearance and improve the lubrication conditions.
USES the friction coefficient of sealing materials and improving the seal structure, reduce the starting force of hydraulic cylinder, as far as possible in order to reduce the heat generated by the mechanical friction loss.
When it is necessary to establish cooling device.
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