Six requirements that cannot be ignored in the purchase of plastic molds

Plastic mold is the abbreviation of a combined mold for compression molding, extrusion molding, injection molding, blow molding, and low foam molding. The coordinated change of the mold convex, concave mold, and auxiliary molding system can process a series of plastic parts of different shapes and sizes. In order to meet the needs of molding parts, we need to pay attention to some matters when selecting plastic molds and put forward corresponding requirements. The following six requirements need to be satisfied to choose a more suitable plastic mold.

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 fall off, the surface condition deteriorates, and the quality of the plastic parts deteriorates. Therefore, it is best to use corrosion-resistant steel or chrome-plated or cymbal-nickel treatment on the surface of the cavity.

2. Good wear resistance The gloss and precision of the surface of plastic parts are directly related to the wear resistance of the surface of the plastic mold cavity, especially when glass fibers, inorganic fillers, and certain pigments are added to some plastics, they Together with the plastic melt, it flows at a high speed in the runner and the mold cavity, which has a great impact on the surface of the cavity. If the material is not wear-resistant, it will soon wear out and damage the quality of the plastic parts.

3. Excellent dimensional stability During plastic molding, the temperature of the plastic mold cavity should reach above 300 °C. For this reason, it is best to choose tool steel (heat-treated steel) that has been properly tempered. Otherwise, the microstructure of the material will be changed, and then the size of the plastic mold will be changed.

4. Easy to process Die parts are mostly made of metal materials, and some structural shapes are still very messy. In order to shorten the production cycle and improve the power, the mold materials are required to be easy to process into the shape and precision required by the drawings.

5. Good polishing performance Plastic parts usually require excellent gloss and appearance, so the roughness of the cavity surface is required to be very small. In this way, it is necessary to perform surface processing on the surface of the cavity, such as polishing and grinding. Therefore, the selected steel should not contain rough impurities and pores.

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