The failure of the moulding plastic machine to open the mold may be caused by a variety of factors, which cover the industrial injection molding machine itself, mold conditions, operation methods, and maintenance. The following is a detailed analysis of these factors and corresponding preventive measures:
Why the industrial injection molding machine cannot open the mold
1. Problems with the hydraulic plastic moulding machine itself
① Insufficient pressure: The hydraulic system may be blocked or leak internally, resulting in insufficient actual mold opening pressure. In addition, damage and oil leakage of the locking cylinder oil seal will also cause the actual mold opening pressure to fail to rise.
② Electrical control system failure: The components in the electric control box may burn out, or the plug may not be properly plugged in or the plug may be damaged, resulting in circuit failure.
③ Mechanical failure: The mechanical origin of the mold locking is improperly adjusted, and the locking force is adjusted too large, resulting in the mechanism being stuck. The locking cylinder oil seal is damaged and leaks oil, resulting in the actual mold opening pressure not being able to rise. The valve core of the mold-opening solenoid valve moves poorly or is stuck.
④ Lubrication problem: The lubrication of the locking system may be insufficient or ineffective, resulting in increased friction of mechanical parts and affecting the mold opening action.
⑤ Hydraulic problem: The hydraulic system may be blocked or leak internally, resulting in insufficient actual mold opening pressure. Insufficient area of the hydraulic ring leads to insufficient mold opening force. Oil flow obstruction during mold opening affects the generation of maximum mold opening force
2. Mold problems
① Mold damage: The mold may be damaged or deformed due to long-term use, failing to open the mold smoothly.
② Improper mold maintenance: Dust, sediment, etc. may accumulate in the mold, affecting the mold opening action.
③ Mold temperature is too low: The mold temperature does not reach the appropriate level, and the plastic is difficult to remove from the mold after cooling and solidification
3. Operation problems
① Improper program setting: The filling, pressure holding, cooling, and other parameter settings of the automatic industrial injection molding machine are unreasonable, failing to open the mold smoothly.
Improper operation: Operators may make operating errors due to lack of skill or negligence, such as not following the correct operating procedures for mold opening.
② Adjust the mechanical and hydraulic systems: Ensure that the clamping mold’s mechanical origin is adjusted correctly, check and replace damaged oil seals, clean the hydraulic system’s blockage, and adjust the mold opening solenoid valve.
4. Other factors
① Interference: The oil circuit or circuit is interfered with externally, obstructing mold opening action.
② Long-term non-use: Long-term non-use of the small industrial injection molding machine may cause dust accumulation and rust inside the system, affecting the mold opening performance.
Preventive measures
1. Regular maintenance and maintenance
① Regularly inspect and maintain the industrial injection molding machine to ensure the normal operation of the hydraulic system, electrical control system, and mechanical components. ② Regularly check and replace worn parts and oil seals to prevent oil leakage and insufficient pressure.
③ Ensure the normal operation of the lubrication system and timely add lubricating oil to reduce friction and wear of mechanical parts
2. Reasonable setting of parameters
Reasonably set parameters such as filling, holding pressure, cooling, etc. according to the performance of the small plastic molding machine and the requirements of the mold to ensure the smooth progress of the injection molding process.
3. Correct operation
① Train and guide operators to ensure that they are proficient in the operation methods and precautions of the industrial injection molding machine.
② Supervise the operation process of operators to prevent problems caused by improper operation.
4. Mold management
① Regularly check the integrity and use of the mold, and repair or replace damaged molds in time.
② Regularly clean and maintain the mold to prevent dust and sediment accumulation from affecting the mold opening action.
5. Prevent interference
Ensure that the industrial injection molding machine‘s working environment is clean and orderly to avoid interference from external factors. Check the circuit and oil system regularly to prevent problems caused by interference.
6. Regular use
For industrial injection molding machines that have not been used for a long time, regular test runs and inspections should be carried out to ensure that their performance is stable and reliable. Through the implementation of the above measures, the problem of the industrial injection molding machine not opening the mold can be effectively prevented, and production efficiency and product quality can be improved.
