Detailed explanation of the four steps of injection mold maintenance

The use of any item requires maintenance to extend its service life. This article introduces the maintenance steps of injection molds as follows.

The responsible company must first understand the basic situation of the mold. For example, each mold should be equipped with a resume card to record and count its use, care (lubrication, cleaning, rust prevention) and damage in detail, and which parts can be found based on this , The component has been damaged and the degree of wear is large to provide information on finding and solving the problem, as well as the molding process parameters of the mold and the material used in the product, so as to shorten the trial run time of the mold and improve the production efficiency.

The processing company should test the various properties of the mold under the normal operation of the injection molding machine and the mold, and measure the size of the final molded plastic part. Through this information, the current state of the mold can be determined, and the cavity and shape can be found The damage of the core, cooling system and parting surface can be judged according to the information provided by the plastic part, and the damage state of the mold and repair measures can be judged.

It is necessary to focus on tracking and testing several important parts of the mold: the role of ejection and guide parts is to ensure the opening and closing movement of the mold and the ejection of the plastic part. If any part of the mold is stuck due to damage, it will cause production to stop. The lubrication of the mold thimble and guide post should be kept frequently (the most suitable lubricant should be selected), and the thimble, guide post, etc. should be regularly checked for deformation and surface damage. Once found, they should be replaced in time; after completing a production cycle, the correct The working surface, movement and guide parts of the mold are coated with professional anti-rust oil, and special attention should be paid to the protection of the elastic strength of the bearing parts of the gear, rack mold and the spring mold to ensure that they are always in the best working condition; The production time continues, and the cooling channel is easy to deposit scale, rust, silt and algae, so that the cross-section of the cooling channel is reduced, the cooling channel is narrowed, and the heat exchange rate between the coolant and the mold is greatly reduced, and the production cost of the enterprise is increased. Therefore, convection The cleaning of the channel should be paid attention to; for the hot runner mold, the maintenance of the heating and control system is helpful to prevent the occurrence of production failures, so it is particularly important. Therefore, after the end of each production cycle, the band heater, rod heater, heating probe, and thermocouple on the mold should be measured with an ohmmeter. If it is damaged, it should be replaced in time and checked with the mold resume. Compare and keep records so that problems can be discovered in time and countermeasures can be taken.

Then the last link is to do the surface maintenance of the mold. The so-called surface is to prevent rust. Therefore, it is particularly important to choose a suitable, high-quality and professional anti-rust oil. After the mold completes the production task, different methods should be used to carefully remove the residual injection molding according to different injection molding. Copper rods, copper wires and professional mold cleaning agents can be used to remove the residual injection molding and other deposits in the mold, and then air dry. It is forbidden to clean up hard objects such as iron wires and steel bars to avoid scratching the surface. If there are rust spots caused by corrosive injection molding, use a grinder to grind and polish, and spray professional anti-rust oil, and then store the mold in a dry, cool, and dust-free place.