Mold maintenance

Update:30-07-2021
Summary:

1: After the mold is used for a long time, the cutting […]

1: After the mold is used for a long time, the cutting edge must be sharpened, and the cutting edge surface must be demagnetized after grinding. The mold user company should make detailed records, count its use, care (lubrication, cleaning, rust prevention) and damage, based on which parts and components have been damaged, and the degree of wear, so as to provide information on discovering and solving problems. And the molding process parameters of the mold and the materials used in the product to shorten the trial run time of the mold and improve the production efficiency. The various properties of the mold should be tested under the normal operation of the injection molding machine and the mold, and the size of the final molded plastic part should be measured. The current state of the mold can be determined through this information, and the cavity, core, cooling system, and According to the information provided by the plastic part, the damage of the parting surface, etc., can be used to determine the damage state of the mold and the repair measures.
2: Springs and other elastic parts are most vulnerable to damage during use, and they usually appear to be broken and deformed. The method adopted is to replace. In the process of replacement, you must pay attention to the specification and model of the spring. The specification and model of the spring are confirmed by the three items of color, outer diameter and length. Only when the three items are the same can they be replaced. The quality of imported spring is better.
3: The punch is prone to breaking, bending and gnawing during the use of the mold, and the punch sleeve is generally gnawed. The damage of the punch and sleeve is generally replaced with parts of the same specification. The parameters of the punch mainly include the size of the working part, the size of the installation part, and the length dimension.
4: Fastening parts, check whether the fastening parts are loose or damaged, the method adopted is to find the parts of the same specification for replacement.
5: Material pressure parts such as material pressure plates, Uniglue, etc., discharge parts such as stripper plates, pneumatic ejectors, etc. During maintenance, check the relationship between parts of each part and whether there is damage, repair the damaged part, check whether there is air leakage by pneumatic jacking, and take measures for the specific situation. If the trachea is damaged, replace it.
It is necessary to focus on tracking and testing several important parts of the mold: the ejector and guide components are used 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 the production to stop, so it should be kept frequently. Lubrication of the mold thimble and guide post (the most suitable lubricant should be selected), and regularly check whether the thimble, guide post, etc. are deformed and surface damage, once found, they should be replaced in time;
After completing a production cycle, it is necessary to apply professional anti-rust oil to the working surface, movement and guide parts of the mold. 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;
As the production time continues, the cooling channel is prone to deposit scale, rust, silt and algae, which reduces the cross-section of the cooling channel and narrows the cooling channel, 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 runner;
For hot runner molds, the maintenance of the heating and control system helps prevent production failures, so it is particularly importan

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