Injection mold, as the most important production tool of injection molding factory, determines the shape, specification, size and appearance finish of the product. The material of the mold is steel, which is generally composed of a front mold and a back mold.

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Precautions For Injection Mold Maintenance
Injection mold, as the most important production tool of the injection molding factory,
determines the shape, specification, size, and appearance finish of the product. The material of
the mold is steel, which is generally composed of a front mold and a back mold.
1. Mold protection
Due to the specificity, precision, and fragility of the mold, the safety protection of the mold is
very important. The overall summary is as follows.
(1) Rust prevention
Prevent rusting caused by water leakage, condensation, rain, and fingerprints in the injection
mold;
(2) Anti-collision
Prevent the mold from crashing due to the breakage of the thimble and the failure to retract into
place;
(3) Depuncture
Prevent mold burrs caused by cloth wiping, material punching, hand wiping, nozzle pliers, and
knife collisions;
(4) Missing parts
Prevent mold damage during use due to lack of tie rods, washers, and other parts;
(5) Anti-pressure
Prevent mold crushing caused by mold clamping due to the remaining product;
(6) Undervoltage
Prevent mold damage caused by excessive low-pressure protection pressure.
Among them, the proportion of mold damage caused by the broken thimble, thimble not
returning in place, residual product in the mold, and lack of auxiliary parts is relatively high, and it

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occurs more frequently.
Therefore, more than 85% of mold damage is caused by this reason. And the maintenance cost of
the mold is generally high. Therefore, how to avoid this kind of situation is directly related to the
interests of the injection molding industry.
In order to prevent production delays caused by mold damage and high maintenance costs, and
to better save labor resources, some companies have developed a product through continuous
research and improvement using machine vision technology, called mold protection Device.
Mold monitor, or mold protector, also known as mold electronic eye, can effectively protect
expensive molds. Some mold experts said that the injection mold protection system, installed on
the injection molding machine, can directly check whether the product is qualified, and check for
residues before closing the mold to prevent mold damage.
When the injection molding machine is running, in each cycle, expensive molds may be damaged
due to plastic residue or dislocation of the slider. The mold protector can prevent these situations
from happening, automatically prevent the mold from closing when an abnormality occurs, and
give an alarm.
2. Mold repair
(1) When disassembling the mold, avoid bumps and water, and move smoothly;
(2) Spray the hot mold, and then spray a small amount of release agent;
(3) Comprehensive inspection of the mold and anti-rust treatment should be carried out, and
moisture and debris in the cavity, core, ejector mechanism, and row position should be carefully
wiped out, and the mold should be sprayed with an anti-rust agent and butter.
3. Mold maintenance
In the continuous working process of the mold, due to the wear of parts, deterioration of
lubricant, water leakage, and crushing of plastic materials during the movement process, mold
maintenance is required.
Mold maintenance is generally divided into daily maintenance and lower mold maintenance.
(1) The daily maintenance of molds generally includes the following aspects:
①Remove rust regularly (appearance, PL surface, mold cavity, core, etc.);
②Re-add lubricant regularly (ejector mechanism, row position, etc.);
③ Regularly replace the wear parts (tie rods, bolts, etc.).
(2) The lower mold maintenance of the mold requires professional maintenance personnel to
remove the mold and conduct professional testing and protection of the mold cavity and thimble.