Mold maintenance

1: After the mold is used for a long time, the cutting edge must be sharpened. After grinding, the cutting edge surface must be demagnetized, and it cannot be magnetic, otherwise it will easily block the material. The mold manufacturer shall make detailed records, count its use, care (lubrication, cleaning, rust prevention) and damage, and thereby find out which parts and components have been damaged and the degree of wear and tear to provide information for discovering and solving problems. And the molding process parameters of the mold and the materials used in the product to shorten the test 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. Through this information, the existing state of the mold can be determined, and the cavity, core, cooling system and The damage of the parting surface, etc., according to the information provided by the plastic parts, can determine the damage state of the mold and maintenance measures.

2: Springs and other elastic parts are most vulnerable to damage during use, and usually breakage and deformation occur. The method adopted is to replace. In the process of replacement, we must pay attention to the specifications and models of the spring. The specifications and models of the spring are confirmed by the color, outer diameter and length. Only when all three items are the same can be replaced. The spring is preferably of the quality of the inlet.

3: During the use of the mold, the punch is prone to breakage, bending and smashing, and the punching sleeve is generally smashed. Damage to the punch and sleeve is generally replaced with parts of the same specification. The parameters of the punch mainly include the working part size, the mounting part size, and the length size.

4: Fasten the parts and check whether the fastening parts are loose or damaged. The method is to find the parts with the same specifications for replacement.

5: Pressing parts such as pressure plate, superior glue, etc., unloading parts such as stripping plate, pneumatic top material, etc. During maintenance, check the accessories of each part and whether there is any damage, repair the damaged part, check the pneumatic top material for air leakage, and take measures for the specific situation. Replace if the air tube is damaged. It is necessary to carry out key tracking and inspection on several important parts of the mold: the function of the ejection and guiding parts is to ensure the opening and closing movement of the mold and the ejection of the plastic parts. If any part is stuck due to damage, it will lead to production stoppage, so it should be kept frequently. Lubricate the thimble and guide post of the mold (use the most suitable lubricant), and regularly check the thimble, guide post, etc. for deformation and surface damage. Once found, replace it in time; after completing a production cycle, work on the mold surface. , sports, guide parts coated with professional anti-rust oil, especially the protection of the elastic strength of the bearing parts with gears, rack and die and the spring mold to ensure that it is always in the best working condition; as the production time continues The cooling channel is easy to deposit scale, rust, sludge and algae, so that the cooling passage section becomes smaller, the cooling passage becomes narrower, the heat exchange rate between the coolant and the mold is greatly reduced, and the production cost of the enterprise is increased, so the flow path is cleaned. Attention should be paid to it; for hot runner molds, the maintenance of the heating and control system is beneficial to prevent production failures, so it is especially important.

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