Maintenance of injection molding machine: maintenance instructions for four key structures
The production of injection molding machines is generally 24-hour operation (shift system), and there is generally no shutdown except for reduced orders or public holidays. For machines that have been in working condition for a long time, we must do a good job in maintenance work, and strive to find and solve problems before the machine fails. Otherwise, once the machine fails, it must be stopped and repaired, which will seriously affect the production and delay the delivery time.
Therefore, it is particularly important to do a good job in the maintenance of the injection molding machine. In order to do a good job in the maintenance of the injection molding machine, the maintenance content must be classified according to the frequency of possible failures: the content with the highest frequency is included in the daily maintenance, the lower frequency is included in the weekly maintenance, and so on The work content of monthly maintenance and annual maintenance is classified.
After the maintenance content is determined, it is best to arrange a special person to be responsible to ensure that the determined maintenance work is carried out effectively according to the planned arrangement. The necessary records must be made when each maintenance work is completed, so that the machine can be evaluated in future work.
For hydraulic injection molding machines, SUDA maintenance work is mainly carried out from the following aspects:
1. Maintenance of electrical system
a. When checking the high-voltage components in the machine, if it is not necessary, the main power supply should not be turned on.
b. When changing the mold, it is impossible to let the cooling water flow into the control box.
c. Check whether the temperature in the control box is too high to affect the normal operation of the electronic board.
d. When replacing the relay, the specified voltage relay should be used.
2. Maintenance of hydraulic system
a. The pressure temperature of the injection molding machine should be kept between 30-50 degrees Celsius. If the oil temperature exceeds 60 degrees Celsius, the following problems will occur:
Pressure oil deteriorates due to oxidation.
b. Oil pump damage, oil leakage and pressure drop due to reduced pressure oil viscosity and the working efficiency of the decompression oil switch.
Accelerates the speed of oil seal aging.
c. Prevent the cooling water from leaking into the oil cylinder, and pay special attention to check whether there is water leakage inside the oil cooler. Every 6 months or so, the oil cooler should be removed and cleaned inside.
d. The pressure oil must be replaced every 3000-4000 hours of operation of the injection molding machine. When replacing the pressure oil, the old and new oil should not be used together. At the same time, the oil screen in the cylinder should be turned off for cleaning.
e. The hydraulic valve fails because the valve core is blocked by foreign objects. The valve core should be removed from the hydraulic valve and cleaned with diesel oil or kerosene (or immersed in clean pressure oil for cleaning), and then use compressed air to remove foreign objects. Unless it is determined that the hydraulic valve is blocked by foreign objects and causes the injection molding machine to malfunction, do not remove the hydraulic valve casually.
3. Maintenance of clamping structure
a. The working life of the hinge of the clamping part is very long, but each movable part should be properly lubricated, otherwise the hinge will wear and reduce the life.
b. Keep the four tie rods clean.
c. Keep the sliding feet and rails of the moving template clean and lubricated.
d. Avoid using mold clamping close to or exceeding the working pressure.
e. When adjusting the mold, the fast mold clamping speed cannot be used.
f. Control the stroke position of the clamping action to the most appropriate position to reduce the impact on the machine during clamping.
4. Maintenance of the injection part
a. Keep the guide rod of the injection table lubricated and clean.
b. Keep the surface of the injection table clean and dry.
c. Except plastics, pigments and additives, do not put anything into the hopper. If you use the return material, you must add a hopper magnetic frame to the hopper to prevent metal fragments from entering the barrel.
d. When the barrel does not reach the preset temperature, do not start the glue melting motor, and do not use the reverse cable (releasing) action to avoid damage to the rotating system components.
e. Before using special plastics, you should consult the plastics dealer, which kind of injection screw is more suitable for injection molding of this kind of plastics.
f. Use the correct method of replacing plastic and cleaning the barrel provided by the plastic manufacturer.
g. Periodically check the parts of the injection table, tighten the loose parts, and ensure that the two injection cylinders are installed in a balanced manner, so as to avoid damage to the oil seal of the injection cylinder and cause oil leakage.
h. When the melt temperature is normal and the melt black spots or discoloration continue to appear, check whether the injection screw mixing head, the stop ring, etc. are damaged.
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Maintenance of injection molding machine: maintenance instructions for four key structures
