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Advice on maintenance of injection molds

Time:2023-09-14 17:39:28|


Source:admin SmallMedium Large

First, select the appropriate 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 will damage the mold or template due to improper adjustment of the clamping force, and at the same time Reduce efficiency.

When selecting the injection 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.

Second, after the mold is mounted on the injection 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.

Third, when the mold is used, it is necessary to maintain normal temperature and work under normal temperature to extend the service life of the mold.

Fourth, the sliding parts on the mold, such as the guide post, the return needle, the push rod, the core, etc., should be observed at any time, regular inspection, timely scrubbing and filling grease, especially when the summer temperature is high, at least two per shift Secondary oil to ensure that these sliders are flexible and prevent tight seizures.

5. 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.

Sixth, the cavity surface has special requirements of the mold, the surface roughness Ra is less than or equal to 0.2cm, absolutely can not be wiped by hand or cotton, apply compressed air, or use advanced napkins and high-grade cotton wool to gently rub the alcohol wipe.

7. The surface of the cavity should be cleaned regularly. The injection mold will decompose the low molecular compound in the molding process to corrode the mold cavity, so that the surface of the bright cavity gradually becomes dull and reduces the quality of the product, so it needs to be scrubbed regularly. Scrub can be dried in time after scrubbing with alcohol or ketone preparations.

8. 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 on the surface of the cavity and core. Or mold release agents, especially in wet areas and rainy seasons, the time is short and also need to be rust-proof.

The moisture in the air will reduce the surface quality of the cavity and the surface quality of the product will decrease. When the 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.

9. After the temporary shutdown, turn on the machine. 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.

10. In order to extend the service life of the cooling channel, the compressed water should be used to remove the water in the cooling channel immediately after the mold is deactivated. Use a small amount of oil to put into the mouth of the nozzle, and then blow it with compressed air to make all the cooling pipes have a layer. Anti-rust oil layer.

XI. Carefully check the working status of each control component 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 mold 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.

12. If you hear abnormal sounds or other abnormalities in the production during production, you should immediately stop the inspection. The mold 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.

Thirteen, when the operator is in the handover class, in addition to handing over the production, the key process of the process is critical, and the use of the mold must be detailed.

14. 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 final mold can be used to produce qualified products. The samples are sent to the maintenance staff together. 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 mold is good now. If there is a problem with the mold, it is necessary to fill in the 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.

15. 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 mold 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.

Kunshan Development Zone Wenxu Mould Factory is mainly engaged in the research and development, design, manufacture, sales of precision injection molds and the production and sales of precision plastic parts. Industry sectors include auto parts, medical, environmental protection, daily necessities, outdoor fitness products, baby carriages, etc.

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