What do you know about the harm of high temperature rise of injection molding machine

    The injection molding machine heats the plastic and applies high pressure to the molten plastic to make it shoot out and fill the mold cavity. The injection molding time is harmful to the injection molding machine due to the phenomenon of too high temperature rise for a long time. To sum up, the hazards of high temperature rise of injection molding machine mainly include thermal deformation of the extension arm of the excavator, reduction of oil viscosity, deformation of rubber seals and poor working quality of parts. Let's understand the details of the hazards together with the injection molding machine technicians.

    One of the hazards: thermal deformation of the lengthening arm of the excavator

    The moving parts with different thermal expansion coefficients in the hydraulic components get stuck due to their smaller matching clearance, which causes action failure, affects the transmission accuracy of the hydraulic system, and leads to the deterioration of the working quality of the parts.

    Harm 2: reduce the viscosity of oil

    Too high temperature rise of injection molding machine will reduce the viscosity of oil, increase leakage, and significantly reduce the volumetric efficiency of pump and the efficiency of the whole system. Due to the decrease of oil viscosity, the oil film of movable parts such as slide valve becomes thinner and cut, the friction resistance increases, resulting in increased wear.

    Hazard 3: deformation of rubber seal

    Too high temperature rise of injection molding machine will deform rubber seals, accelerate aging and failure, reduce sealing performance and service life, and form leakage.

    Harm 4: accelerate the oxidative transformation of oil

    Too high temperature rise of injection molding machine will accelerate the oxidative transformation of oil, precipitate asphalt and reduce the service life of hydraulic oil. Precipitates block damping holes and slit valve ports, resulting in stuck pressure valves and failure to act, elongation and bending of metal pipelines, and even cracking.

    Hazard 5: lead to poor working quality of parts

    Too high temperature rise of injection molding machine will lead to poor working quality of parts, escape of dissolved air in oil and cavitation, resulting in reduced working performance of hydraulic system. The ideal working temperature of the hydraulic system should be between 45 ° C and 50 ° C. The reason is that the hydraulic system is designed according to the viscosity of a selected pressure oil, but the viscosity will change with the oil temperature up and down, which will affect the working components in the system, such as oil cylinder and hydraulic valve, and reduce the control accuracy and response flexibility, especially the situation of fine injection machine.