The mold is generally stored in the warehouse until the next production cycle. However, some processing enterprises do not pay enough attention to the mold preservation. Dongguan mold processing makes the mold rust and surface finish decline during the storage period, resulting in the decline of product quality and high rejection rate. Some molds are even difficult to reuse, so a large amount of funds need to be invested to replace new molds, resulting in great waste. The data show that use and maintenance account for 15% – 20% of the factors affecting the service life of molds. The service life of injection moulds can reach 800000 times in general, and some well maintained moulds abroad can even be extended by 2-3 times. However, due to the neglect of maintenance in domestic enterprises, the service life of injection mold is relatively short, which is only equivalent to 1 / 5 ~ 1 / 3 of that in foreign countries. Due to the short service life of die, steel processing time and energy waste, as well as the impact on product quality, the loss of billions of yuan per year.
Regular maintenance can keep the injection mold in good condition. After the new die is tested, no matter whether it is qualified or not, the stress relief tempering should be carried out before the mold is cooled to room temperature. When the new die is used to 1 / 6 ~ 1 / 8 of its design life, i.e., 10000 times of aluminum die casting, 5000 times of magnesium and zinc die casting, and 800 times of copper die casting, the mold cavity and die base should be tempered at 450-480 ℃, and the cavity should be polished and nitrided to eliminate the internal stress and slight cracks on the surface of the cavity. After that, the same maintenance should be carried out every 12000-15000 mould times. When the mould is used for 50000 times, it can be maintained every 25000 ~ 30000 mould times.
Therefore, the maintenance of injection mold is very important. The following editor will tell you the specific methods of mold maintenance:
1. First of all, the processing enterprise should provide a resume card for each pair of molds, recording and counting the use, care (lubrication, cleaning, rust prevention) and damage in detail, so as to find out which parts and components have been damaged, and the degree of wear, so as to provide information for finding and solving problems, as well as the molding process parameters and product materials of the mold, so as to shorten the trial run time of the mold Improve production efficiency. 2. The processing enterprise should test the performance of the injection molding machine and mold under normal operation, and measure the size of the final molded plastic parts. Through this information, the existing state of the mold can be determined, and the damage of the cavity, core, cooling system and parting surface can be found. According to the information provided by the plastic parts, the damage status of the mold and the maintenance measures can be judged. Dongguan Mechanical parts processing 3. To focus on tracking inspection of several important parts of the mold: the function of ejecting and guiding components 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 lead to production stop. Therefore, it is necessary to keep the lubrication of the mold ejector pin and guide pillar (the most suitable lubricant should be selected), and regularly check whether the ejector pin and guide pillar are in good condition Once deformation and surface damage are found, they should be replaced in time; after completing a production cycle, the working surface, moving and guiding parts of the mold should be coated with professional antirust oil, especially the protection of the elastic strength of the bearing parts of the mold with gear and rack and the spring mold, so as to ensure that they are always in the best working state; with the continuous production time, the cooling channel It is easy to deposit scale, rust, sludge and algae, which makes the cross-section of cooling channel smaller and the cooling channel narrow, which greatly reduces the heat exchange rate between the coolant and the mold and increases the production cost of the enterprise. Therefore, attention should be paid to the cleaning of the flow channel. For the hot runner mold, the maintenance of heating and control system is helpful to prevent the occurrence of production failure, so it is particularly important. Computer gong processing, Dongguan high speed computer gong processing, Dongguan mold processing, Dongguan Mechanical parts processing, CNC processing, therefore, after the end of each production cycle, ohmmeter should be used to measure the belt heater, rod heater, heating probe and thermocouple on the mold. If there is any damage, it should be replaced in time, and compared with the mold resume, and make records, so as to timely find out Problems, take countermeasures. 4. Pay attention to mold surface maintenance, it directly affects the surface quality of products, the focus is to prevent corrosion, therefore, it is particularly important to select a suitable, high-quality, professional anti rust oil. After the mold has completed the production task, different methods should be taken according to different injection molding to carefully remove the residual injection molding and other deposits in the mold with copper rod, copper wire and professional mold cleaning agent, and then air dry. It is forbidden to clean iron wire, steel bar and other hard objects to avoid scratching the surface. If there are rust spots caused by corrosive injection molding in CNC processing, grind and polish with a grinder, spray professional antirust oil, and then store the mold in a dry, cool and dust-free place.
Through the above four points to do a good job in the maintenance of the mold, can shorten the mold assembly, reduce production failure, make the production run smoothly, ensure product quality, reduce waste loss, and reduce the enterprise’s operating costs and fixed assets investment. At the beginning of the next production cycle, the enterprise can smoothly produce qualified products.
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