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What's the Matter with the Injection Molding Machine not Being Able to Open the Mold?

A friend asked, why can't the injection molding machine open the mold?

We know that the mold opening force of the injection molding machine is much smaller than the mold clamping force, so the ultimate reason for the failure of mold opening is that the resistance of the mold opening is greater than the mold opening force. In practice, the ability to open the mold is generally the following situations:

1. The mechanical origin of the mold clamping is improperly adjusted when the injection molding machine leaves the factory. It is too far ahead, causing the mechanism to be stuck. If the mold cannot be opened frequently, you should doubt this aspect and ask the manufacturer to tune it.

2. Or the organization is stuck. For the old machine is not the first case, to be suspicious of this situation. In general, the adjustment of the clamping force is too large, such as adjusting to 1700 kg and other habits are not good, such as not opening the mold for a long time, system changes and other habits are not good. The bottom line of this problem is the technician's adjustment habits and parameters. The solution is very troublesome, to remove or loosen the fixing nut on the cross rod

3. The oil seal of the clamping cylinder is damaged and leaks oil, causing the actual mold opening pressure to not rise. For this reason, it is useless to look at the pressure gauge, and the cylinder should be disassembled for inspection.

4. The spool of the mold-opening solenoid valve does not move well, or is stuck, and the spool is not in place. The solution is to disassemble the solenoid valve and check.

5. Check whether the parameter design is appropriate and whether the pressure is not large enough.

6. There may be a problem with the lubrication of the clamping system. Inspection and maintenance.

The inability to open the mold is an annoying problem in production. It does not occur often, but it takes a long time to deal with it once.

Preventive measures: In order to prevent the mold from being opened, the following precautions should be taken:

1. Correctly calculate the clamping force, the bigger the better.

2. Do not keep the high-pressure mold-locking state during shutdown, remember to remember.

3. In case of a power failure in the clamping state, it should be dealt with in time, and the cross head nut will be loosened if it does not come after a long time.

4. Check the mechanical oil frequently, and prevent the impurity iron filings from blocking the solenoid valve.

5. Check the lubrication of the clamping system, if the oil cannot be cut off, the guide rod will thorn.

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