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  • Fifteen suggestions for the maintenance and care of injection molds

Fifteen suggestions for the maintenance and care of injection molds

Compared with other moulds, injection moulds are more complex and precise in structure, so the requirements for operation and maintenance of products are also higher.

I. choose the right molding equipment, determine the reasonable process conditions, if the injection molding machine is too small to meet the requirements, too large is a waste of energy, and will be due to improper adjustment of the clamping force and damage to the mold or template, while reducing efficiency.

When choosing the injection machine, the maximum injection volume, the effective distance of the tie bar, the mold installation size on the template, the maximum mold thickness, the minimum mold thickness, the template stroke, the ejection method, the ejection stroke, the injection pressure, the clamping force, etc. should be verified and used only after the requirements are satisfied. The reasonable determination of the process conditions is also one of the contents of the correct use of the mold, clamping force is too large, the injection pressure is too high, the injection rate is too fast, the mold temperature is too high, will cause damage to the mold life.

II. After the mold is installed on the injection machine, run the mold empty first. Observe whether the operation of each part is flexible, whether there is any abnormal phenomenon, whether the ejecting stroke and opening stroke are in place, whether the parting surface fits tightly when the mold is closed, and whether the pressure plate screw is tightened, etc.

III. When using the mold, keep the normal temperature and work at normal temperature, which can prolong the service life of the mold.

IV. The sliding parts on the mold, such as the guide pillar. Return pin. Pushrod. Cores, etc., should be observed at any time, checked regularly, scrubbed, and filled with lubricating grease at the right time, especially in summer when the temperature is high, at least twice a shift to ensure that these sliding parts move flexibly and prevent a tight bite.

V. Before each mold locking, attention should be paid to whether the cavity is clean, absolutely no residual products, or any other foreign matter, clean-up is strictly prohibited when using hard tools to prevent touching the surface of the cavity.

VI. The surface of the cavity has special requirements of the mold, the surface roughness Ra less than or equal to 0.2cm, absolutely can not be wiped by hand or cotton wool, the application of compressed air blowing, or use senior napkins and senior degreasing cotton dipped in alcohol to gently wipe.

VII. The surface of the cavity should be cleaned regularly, the injection mold often decomposes low molecular compounds during the molding process to corrode the mold cavity, making the bright cavity surface gradually become dull and reducing the quality of the product, so you need to regularly scrub, scrubbing can use alcohol or ketone preparations after scrubbing to blow dry in time.

VIII. When the operator needs to stop temporarily, the mold should be closed to keep the cavity and core exposed to prevent accidental damage, and the downtime is expected to exceed 24 hours, the cavity. The surface of the core should be sprayed with anti-rust oil or mold release agent, especially in wet areas and rainy season, the time is short to do the anti-rust treatment.

Water vapor in the air will reduce the surface quality of the cavity and the surface quality of the products. When the mold is used again, the oil on the mold should be removed and wiped clean before use. There is a mirror requirement of cleaning compressed air blowing dry and then hot air blowing dry, otherwise, it will bleed out during molding and make the products defective.

IX. Start the machine after a temporary stop, open the mold should check whether the slider limit moves, no abnormalities are found before closing the mold. In short, be careful before starting the machine and do not be careless.

X. In order to prolong the service life of the cooling water channel, when the mold is out of use, the water in the cooling water channel should be removed immediately with compressed air, and a small amount of machine oil should be put into the mouth part, and then blow with compressed air to make all the cooling pipes have a layer of anti-rust oil.

XI. work carefully check the working state of each control part, strictly prevent the auxiliary system from abnormalities, heating, control system maintenance is particularly important for hot runner molds. At the end of each production cycle, the bar heater, band heater, and thermocouple should be measured with Euro mother and compared with the technical description information of the mold to ensure its function is intact. At the same time, the control circuit may be tested by means of an ammeter installed in the circuit. The oil in the hydraulic cylinder used for core extraction is emptied as much as possible and the nozzle is sealed to avoid leakage of hydraulic oil or contamination of the surrounding environment during storage and transportation.

XII. If you hear any abnormal sound or other abnormal situation from the mold during production, you should stop immediately for an inspection. Mold maintenance personnel should make a tour to check the normal running molds in the workshop and deal with any abnormalities found in time.

XIII. When operators hand over the shift, besides handing over the production and process tight key records, they should also have a detailed account of the mold use condition.

XIV. When the mold has finished the production quantity of products and wants to get off the machine to replace other molds, the mold cavity should be coated with rust inhibitor, and the mold and its accessories should be sent to the mold maintenance personnel, and the last mold production qualified products should be sent to the maintenance personnel together with the sample parts. In addition, you should also send a list of the use of the mold, fill in the details of the mold on what machine, from a certain year and a certain month and a certain date, how many products produced, now the mold is good. If there is any problem with the mold, you should fill in what problems exist in the mold on the user list, put forward specific requirements for modification and improvement, and hand in a sample of the mold that has not been processed to the custodian, leaving it for the mold worker's reference when repairing the mold.

XV. A mold library should be set up, with special management personnel, and mold files should be established, and computerized management should be implemented for molds if possible. The temperature should be kept below 70%, if the humidity exceeds 70%, the moulds will be easily rusted, the moulds should be stored on the shelves, pay attention to anti-corrosion, dustproof, etc. To mark the need for repair or complete repair. Maintenance signs.
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