Five major hazards of high injection molding machine temperature and how to deal with them

One of the hazards: making the machinery produce thermal deformation

The moving parts with different thermal expansion coefficients in the hydraulic components become stuck due to the small clearance, causing malfunction, affecting the transmission accuracy of the hydraulic system, resulting in poor quality of work of the components.
 

Hazard No. 2: Reduce the viscosity of the oil

The high-temperature rise of the injection molding machine will lead to a decrease in oil viscosity, leakage increases, the volume efficiency of the pump and the efficiency of the entire system will be significantly reduced. As the oil viscosity decreases, the oil film of the sliding valve and other moving parts becomes thinner and is cut through, and the friction resistance increases, leading to increased wear.
 

Hazard No. 3: Deformation of rubber seals

The high-temperature rise of the injection molding machine will make the rubber seal deformation, accelerating aging failure, reducing the sealing performance and service life, resulting in leakage.

 

Hazard No. 4: accelerate the oxidation of oil deterioration

The high-temperature rise of the injection molding machine will accelerate the oxidation and deterioration of the fluid, precipitation of asphalt substances, reducing the service life of the hydraulic fluid. The precipitated material clogs the damping holes and gap-type valve opening, leading to pressure valve jamming and can not act, metal pipe elongation and bending, and even rupture.
 

Hazard No. 5: Result in poor quality of work of parts

Injection molding machine temperature rises too high will lead to poor quality of work of the components, dissolved air in the oil escape, resulting in cavitation, resulting in reduced performance of the hydraulic system. The ideal working temperature of the hydraulic system should be between 45 degrees -50 degrees, the reason is that the hydraulic system is based on a selected pressure oil viscosity and design, but the viscosity will change with the oil temperature, which in turn affects the work of the system components, such as cylinders, hydraulic valves, etc., so that the control accuracy and response sensitivity is reduced, especially in the case of the precision injection molding machine.

At the same time, high temperature will also accelerate the aging of the seals so that they harden and crack; too low temperature is a large processing energy consumption so that the operating speed is reduced. Therefore, it is necessary to pay close attention to the working temperature of hydraulic oil. Oil temperature is too high for a variety of reasons but mostly attributed to the failure of the oil circuit or cooling system failure.
 

Injection molding machine temperature is too high treatment methods

(1) According to the different load requirements, frequently check and adjust the pressure of the relief valve to make it just right.

(2) Reasonable choice of hydraulic oil, especially the viscosity of the fluid, under the conditions allowed, 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 conducive to reducing the workload and heat generation.

(4) Improve the quality and accuracy of the assembly of hydraulic components and hydraulic systems, and strictly control the fit clearance of the mating parts and improve lubrication conditions. The use of sealing materials with a small coefficient of friction and improve the sealing structure, as far as possible to reduce the starting force of the hydraulic cylinder, to reduce the heat generated by mechanical friction losses.