Injection mold maintenance

Compared with other molds, the injection mold is more complicated and precise, and the requirements for operation and maintenance of the product are higher. Therefore, in the whole production process, the use of the positive solution and the meticulous maintenance of injection mold,maintenan the normal production of the enterprise and improve the enterprise. Benefits are of great significance.

automotive front bumper mould

Choose the right injection molding equipment, determine the reasonable process conditions, if the injection molding machine is too small, it can not meet the requirements, too much is a waste of energy, and it will damage the mold or template due to the improper adjustment of the clamping force, and at the same time make the efficiency reduce.

When selecting the injection molding machine, the maximum injection amount, the effective distance of the tie rod, the mold mounting size on the template, the maximum mold thickness, the minimum mold thickness, the template stroke, the ejection mode, the ejection stroke, the injection pressure, the clamping force, etc. should be performed. Verification, can be used after the request is sufficient. The reasonable determination of the process conditions is also one of the contents of the correct use of the mold, the clamping force is too large, the injection pressure is too high, the injection rate is too fast, the mold temperature is too high, etc., which will cause damage to the service life of the mold.

After the injection mold is mounted on the injection molding machine, the empty mold must be operated first. Observe whether the operation of each part is flexible, whether there is abnormal phenomenon, the ejection stroke, whether the opening stroke is in place, whether the parting surface is tightly matched when the mold is closed, and whether the pressure plate screw is tightened.

When the mold is used, it should maintain normal temperature and work at normal temperature to prolong the service life of the mold.

Sliding parts on the injection mold, such as guide post, return pin, push rod, core, etc., should be observed at any time, regularly check, timely scrub and add grease, especially when the temperature is high in summer, add at least two times per shift. In order to ensure that these sliders are flexible and prevent tight seizures.

Before each mold clamping, it should be noted that whether the cavity is cleaned or not, no residual products or any other foreign objects are allowed. It is strictly forbidden to use hard tools during cleaning to prevent the surface of the cavity from being damaged.

The surface of the cavity has special requirements, the surface roughness Ra is less than or equal to 0.2cm, absolutely can not be wiped by hand or cotton, blown with compressed air, or gently wiped with high-grade napkin and high-grade cotton wool.

The surface of the cavity should be cleaned regularly. The injection mold will decompose the low molecular compound to corrode the mold cavity during the molding process, so that the surface of the bright cavity gradually becomes dull and reduces the quality of the product. Therefore, it needs to be scrubbed regularly and scrubbed. Use a alcohol or ketone preparation to dry in a timely manner after scrubbing.

When the operation needs to be temporarily stopped, the mold should be closed to prevent the cavity and core from being exposed to prevent accidental damage. The downtime is expected to exceed 24 hours. Spray the anti-rust oil or the surface on the cavity and core surface. Moulding agents, especially in wet areas and rainy seasons, should be rust-proofed for a short time.

The moisture in the air will reduce the surface quality of the cavity and the surface quality of the product will decrease. When the injection mold is used again, the oil on the mold should be removed and wiped clean before use. The cleaned compressed air required by the mirror surface is dried and then dried with hot air. Otherwise, the product will be oozing out during molding and the product will be defective.


After the temporary shutdown, the machine will be turned on. After opening the mold, check whether the slider limit is moved. If no abnormality is found, the mold can be closed. In short, be careful before starting the machine, not careless.

In order to extend the service life of the cooling water channel, the water in the cooling water channel should be immediately removed by compressed air when the mold is deactivated. A small amount of oil is put into the mouth of the nozzle, and then compressed air is blown to make all the cooling pipes have a layer of rust prevention. Oil layer.

Carefully check the working status of each control unit during work to prevent abnormalities in the auxiliary system, heating, and maintenance of the control system is especially important for hot runner molds. At the end of each production cycle, rod heaters, belt heaters, and thermocouples should be measured with the mother-in-law and compared with the technical description of the injection mould to ensure that the function is intact. At the same time, the control loop may be tested by an ammeter mounted in the loop. The oil in the hydraulic cylinder for core pulling is drained as much as possible, and the nozzle is sealed to prevent the hydraulic oil from leaking out or polluting the surrounding environment during storage and transportation.

If you hear any abnormal sounds or other abnormalities in the production, you should stop the inspection immediately. The injection mould maintenance personnel shall conduct a patrol inspection on the normal running molds in the workshop. When abnormal phenomena are found, they shall be dealt with in time.

When the operator is in the handover class, in addition to handing over the production, the process is critical to the critical record, and the injection mold usage status should be detailed.

When the mold completes the production quantity of the product, when replacing other molds, the mold cavity should be coated with anti-rust agent, the attachment of the mold should be sent to the mold maintenance staff, and the last mold can be used to produce qualified products as samples. Send to the maintenance staff. In addition, you should also send a mold use list, fill in the machine on which the mold is used, how many products are produced from a certain month of the year, and whether the injection mould is good now. If there is a problem with the mold, it is necessary to fill in the injection mold on the use sheet, propose specific requirements for modification and improvement, and submit a sample of untreated sample to the custodian, and leave it to the mold for repair.

A mold library should be set up, special personnel should be set up, and mold files should be established. If possible, computer management should be carried out on the molds. The mold library should choose a place with low moisture and ventilation. The temperature should be kept below 70%. If the humidity exceeds 70%, the mold will be easy to rust. The injection mould should be stored on the shelf, pay attention to anti-corrosion and dustproof. Mark the signs that need to be repaired or repaired and maintained.