3 Tips for Injection Mold Maintenance

Injection mold longevity is just as important to part cost and quality as the design. The effective and careful maintenance of plastic injection mold is needed to keep an injection molding machine in the best working order. Then how to maintain plastic injection molds? The following tips can help you understand what need to do for injection mold maintenance.



Preventive Maintenance of Injection Molding Mold

Due to the specificity, precision, and fragility of the injection mold, it is very important to protect the safety of the mold. The following aspects are generally summarized:

Avoid rusting

Protect the injection mold from rusting due to water leakage, water condensation, rain and hand marks.

Avoid collision

Protect the mold from collisions due to fracture or inadequate restoration of the ejection pin.

Burr removal

Remove burrs on the mold due to cloth wiping, feeding pressing, hand wiping, plastic nipper contact and knife contact.

Missing parts

Protect the mold from being damaged during use due to missing pull rods, gaskets and other parts.

Avoid compression

Protect the mold from compressing damage due to clamping resulted from product residues.

Avoid voltage shortage

Protect the mold from being damaged due to excessive pressure for low-voltage protection.

Injection Mold Maintenance

Among the above, fracture or inadequate restoration of the ejection pin, product residues on the mold and missing parts are the most common causes of damages to the mold. Therefore, more than 85% of the mold damage is caused by this reason, and the maintenance cost of the mold is generally high. Therefore, how to avoid such a situation is directly related to the benefits of the injection industry.


In order to prevent production delays caused by mold damage and high maintenance costs, and at the same time, to better save labor resources, some companies have developed a product using machine vision technology after continuous research and improvement, called “mold protector”.


Mold protector, or mold monitor, also known as mold electronic eye, can effectively protect valuable molds. Some mold experts said that the injection mold protection system, installed on the injection machine, can directly check whether the product is qualified, and check for residues before closing the mold to prevent clamping damages.


When the injection machine is running, the expensive molds may be damaged due to plastic residue or dislocation of the slider in every cycle. The mold protector can prevent these situations from happening, automatically prevent the mold from clamping when an abnormality occurs, and give an alarm.




Steps of Injection Mold Repair


When the mold is being disassembled, relocate it smoothly and avoid collision or water;


Heat the mold and apply a small amount of release agent to it;


Fully inspect the mold and make anti-rust treatment. Carefully wipe dry and wipe clean the cavity, core, ejection structure and slides, and apply anti-rust agents and machine oil to the mold.


Injection Mold Repair


Two Classes of Injection Mold Maintenance

In the continuous working process, the mold needs to be maintained due to the part wearing, deterioration of the lubricant, water leakage, and crushing of the plastic material during the movement,
Mold maintenance usually includes daily maintenance and off-machine maintenance.


The daily maintenance of molds includes the following aspects:

Remove rust regularly

(surface, PL planes, cavity and core)

Lubricate regularly

(ejection structure and slides)

Replace wearing parts regularly

(pull rods and bolts)

In off-machine maintenance of the mold, professional maintainers will disassemble the mold and test and maintain its cavity and ejection pin professionally.



Other maintenance knowledge

-> Maintenance For 4 Core Parts of IMM