Feb. 03, 2021
Here is the Injection Molding Machine Supplier to share with you about the five major hazards and treatment methods of high temperature of the injection molding machine
The moving parts with different coefficients of thermal expansion in the hydraulic components are stuck due to their smaller fitting clearances, causing malfunctions, affecting the transmission accuracy of the hydraulic system, and deteriorating the working quality of the parts.
Excessive temperature rise of the injection molding machine will cause the viscosity of the oil to decrease, increase the leakage, 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 moving parts such as slide valves becomes thinner and cut, and frictional resistance increases, leading to increased wear.
Injection Molding Machine
Excessive temperature rise of the Injection Molding Machine will deform the rubber seals, accelerate aging failure, reduce the sealing performance and service life, and cause leakage.
Excessive temperature rise of the injection molding machine will accelerate the oxidative deterioration of the oil, precipitate asphalt substances, and reduce the service life of the hydraulic oil. The precipitates block the damping orifice and the slit valve port, causing the pressure valve to become stuck and unable to move, and the metal pipe is stretched and bent, or even ruptured.
Excessive temperature rise of the injection molding machine will cause the quality of the parts to deteriorate, and the dissolved air in the oil will escape, resulting in air pockets, which will reduce the working performance of the hydraulic system. The ideal working temperature of the hydraulic system should be between 45 degrees and 50 degrees. The reason is that the hydraulic system is designed according to a selected pressure oil viscosity, but the viscosity will change with the oil temperature, which will affect the work of the system. Components, such as oil cylinders, hydraulic valves, etc., reduce 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 seal and cause it to harden and crack; if the temperature is too low, the processing energy will be consumed and the operating speed will be reduced. Therefore, it is necessary to pay close attention to the working temperature of hydraulic oil. There are many reasons for high oil temperature, but most of them are due to oil circuit failure or cooling system failure.
(1) According to different load requirements, frequently check and adjust the pressure of the overflow valve to make it just right.
(2) Choose hydraulic oil reasonably, especially the viscosity of the oil. 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 conducive to reducing work load and heating.
(4) Improve the assembly quality and accuracy of hydraulic components and hydraulic systems, strictly control the clearance of matching parts and improve lubrication conditions. The use of sealing materials with a small friction coefficient and improved sealing structure to reduce the starting force of the hydraulic cylinder as much as possible to reduce the heat generated by the mechanical friction loss.
Hope the above sharing is helpful to everyone. The company also provides Vertical Injection Molding Machines and automatic injection molding machines, please feel free to contact us if necessary