Importance and maintenance process of injection mold maintenance
Importance and maintenance process of injection mold maintenance
As the most important molding equipment, the quality of injection mold is directly related to the quality of products. Moreover, because the mold occupies a large proportion in the production cost of the injection molding enterprises, its service life directly affects the cost of the injection molding products. Therefore, to improve the quality of injection mold, maintain and extend its life cycle is an important issue for injection molding enterprises to reduce cost and increase efficiency.
Due to the variety of products and the frequent replacement of molds, injection molding enterprises usually store the molds in storage until the next production cycle comes. However, some processing enterprises don't pay enough attention to the mold preservation, which makes the mold rust and the surface finish drop during the preservation period, resulting in the decline of product quality and the high rate of waste products. Some molds are even difficult to reuse, so a large amount of money needs to be put into the new mold again, resulting in great waste.The data shows that the use and maintenance account for 15% - 20% of the factors affecting the service life of the mold, the service life of the injection mold can reach 800000 times generally, and some foreign well maintained molds can even extend another 2-3 times. However, due to neglect of maintenance in domestic enterprises, the service life of injection mold is relatively short, which is only 1 / 5-1 / 3 of that in foreign countries. Due to the short service life of the die, the steel processing time and energy waste, as well as the impact on product quality caused by the loss of billions of yuan per year.
Therefore, the maintenance of injection mold is very important, as follows:
One First of all, the processing enterprise shall provide each mould with a resume card to record and count its use, care (lubrication, cleaning, rust prevention) and damage in detail, so as to find out which parts and components have been damaged and the extent of wear and tear, so as to provide information for finding and solving problems, as well as the molding process parameters of the mould and the materials used for the products, so as to shorten the trial run time of the mould Improve production efficiency.
2. the processing enterprise should test all kinds of performance of the mold under the normal operation of the injection molding machine and the mold, 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 out. According to the information provided by the plastic parts, the damage state of the mold and the maintenance measures can be judged.
Three Several important parts of the mold shall be tracked and tested: the function of ejection and guide parts is to ensure the opening and closing movement of the mold and ejection of plastic parts. If any part is stuck due to damage, production will be stopped. Therefore, the lubrication of the ejector pin and guide pillar of the mold shall be kept regularly (the most suitable lubricant shall be selected), and the deformation and surface damage of the ejector pin and guide pillar shall be checked regularly Once found, it shall be replaced in time;
After a production cycle, professional antirust oil shall be applied to the working surface, moving and guiding parts of the mould, especially the protection of the elastic strength of the bearing parts of the mould with gear and rack and the spring mould, so as to ensure that it is always in the best working condition;
With the continuous production time, the cooling channel is easy to deposit scale, rust, sludge and algae, which makes the cross section of the cooling channel smaller and the cooling channel narrower, greatly reducing the heat exchange rate between the coolant and the mold, and increasing the production cost of the enterprise. Therefore, attention should be paid to the cleaning of the channel. For the hot channel mold, the maintenance of the heating and control system is conducive to preventing production failure Occurs, therefore is particularly important.
Therefore, after the end of each production cycle, the belt heater, rod heater, heating probe and thermocouple on the mold shall be measured with ohmmeter. If they are damaged, they shall be replaced in time, compared with the mold resume, and records shall be made so that problems can be found in time and countermeasures can be taken.
4. Pay attention to the surface maintenance of the mold, which directly affects the surface quality of the product, and the key is to prevent corrosion. Therefore, it is particularly important to select a suitable, high-quality and professional antirust oil. After the mold completes the production task, different methods should be adopted according to different injection molding to carefully remove the residual injection molding. Copper rod, copper wire and professional mold cleaner can be used to remove the residual injection molding and other deposits in the mold, and then air dry.
It is forbidden to clean hard objects such as wire and steel bar to avoid scratching the surface. If there are rust spots caused by corrosive injection molding, it is necessary to use a grinder to grind and polish, spray with professional antirust oil, and then store the mold in a dry, cool and dust-free place.
A pair of well maintained moulds can shorten the time of mould assembly and test run, reduce production failure, make production run smoothly, ensure product quality, reduce waste product loss, and reduce the operation cost and fixed asset investment of the enterprise. At the beginning of the next production cycle, the enterprise can smoothly produce qualified products. Therefore, for injection molding products processing enterprises, in the current fierce market competition, the maintenance of good mold can help enterprises.
