Selection of injection mold materials and maintenance of injection molds

The selection of injection mold materials and the maintenance of injection molds are a very important link. Choosing a good injection mold material can reduce the quality of plastic parts. The maintenance of injection molds can increase the use time of injection molds. The following is Let's take a look.

First, the choice of injection mold materials

1. High corrosion resistance Many resins and additives have a corrosive effect on the surface of the cavity. This corrosion causes the metal on the surface of the cavity to corrode and peel off, the surface condition deteriorates, and the quality of the plastic parts deteriorates. Therefore, it is best to use corrosion-resistant steel, or chromium plating, cymbal nickel treatment on the surface of the cavity.

2. Good wear resistance. The gloss and accuracy of the surface of injection molded parts are directly related to the wear resistance of the surface of the injection mold cavity, especially when glass fiber, inorganic fillers and certain pigments are added to some plastics. Together with the plastic melt, it flows quickly in the runner and mold cavity, and it has great friction on the surface of the cavity. If the material is not wear-resistant, it will wear out quickly, which will damage the quality of the plastic part.

3. Good dimensional stability. During injection molding, the temperature of the injection mold cavity must reach above 300°C. For this reason, it is best to select tool steel (heat-treated steel) that has been properly tempered. Otherwise it will cause changes in the microstructure of the material, resulting in changes in the size of the injection mold.

Second, the maintenance of the injection mold

1. The processing enterprise should first equip each pair of molds with a resume card to record and count its use, care (lubrication, cleaning, rust prevention) and damage in detail. Based on this, it can find out which parts and components have been damaged and the degree of wear. Provide information on discovering and solving problems, as well as 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 production efficiency.

2. 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 core can be found. , Cooling system and parting surface, etc., according to the information provided by the plastic parts, the damage state of the mold and the repair measures can be judged.

3. 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 parts. If any part of the mold is stuck due to damage, it will cause production to stop. Always keep the mold thimble and guide post lubricated (choose the most suitable lubricant).

The selection of injection mold materials and the maintenance of injection molds have been brought to everyone. Friends who need to understand injection molds can come to Heng zhao to learn more. We have professional customer service to answer you.