Those Things About Injection Molding Machine Maintenance!

Sep. 27, 2020

Injection molding machine is also known as injection molding machine or Injection Machine. It is the main molding equipment that uses plastic molding dies to make thermoplastic or thermoset plastics into various shapes of plastic products. Divided into vertical, horizontal and all-electric. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it eject and fill the mold cavity.

The following are some of the problems and solutions for injection molding opportunities sorted out by Injection Molding Machine Manufacturers:

After the injection molding machine motor starts, the pressure gauge is under pressure




1): The magnifying board is broken. Use a multimeter to measure whether there is current passing, and repair the amplifier board.


2): The overflow valve is stuck. Remove the overflow valve to check and clean the overflow valve.


After the injection molding machine is turned on for a period of time, the oil pump sounds loudly. Troubleshooting




1): The quality of the suction pipe is not good. Remove the filter to check for deformation. Whether the suction pipe is stratified. Replace the oil pipe and filter.


2): The filter is not clean. Whether the hydraulic oil has too much impurities. Clean the filter.


3): Oil pump wear: check the oil pump oil pan and rotor end surface. Replace the oil pump.


Crawling fault treatment of Injection Molding Machine




1): Poor lubrication conditions.Pause—Slide—Pause appears. Increase the amount of lubrication.


2): The system is immersed in air. Need to exhaust.


3): Reasons for mechanical rigidity. Parts are worn and deformed, causing changes in friction and creeping. Replace parts.

Injection Molding Machine

Injection Molding Machine


Analysis of Causes of Hydraulic Oil Pollution in Injection Molding Machines


Cause oil pollution:


1): Air is mixed with oil. The main banquet is due to poor tightness of pipe joints, hydraulic pumps, and hydraulic cylinders. It is manifested by bubbles on the fuel tank.


2): Water is mixed into the oil. Makes the oil milky white. The main reason is that the cooler is leaking.


3): Solid impurities are mixed in the oil. Mainly chips, welding slag, rust and metal powder.


4): Gelatinous substances are produced in the oil. The main feature is that the seal is eroded by the oil or the oil is deteriorated, causing the oil to produce a gelatinous substance, which often blocks the small holes.


Troubleshooting of loud noise when the injection molding machine opens



1): The proportional linearity is poor, and the position of the mold opening and closing time is poorly adjusted. Check the ramp up and ramp down of the amplification board, adjust the ramp up and down of the amplification board, and adjust the time appropriately.


2): The lubrication of the hinge of the clamping machine is poor. Check the lubrication of the elbow column, the second plate sliding foot and the lubrication of the hinge, and increase the lubrication.


3): Mold clamping force is too large, check the clamping force when the mold is stressed, and reduce the clamping force according to the user's product condition.


4): The deviation of the parallelism of the first two boards, check the parallelism of the two boards. Adjust the parallel error of the second board and the head board.


5): Slow to fast mold opening position is too small and speed is too fast. Check whether the position of slow mold opening to fast mold opening is appropriate, and whether the slow mold opening speed is too fast. Lengthen the slow mold opening position and reduce the slow mold opening speed.

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