6 Factors to Consider When Buying Injection Molded Parts

Injection mold is a tool for producing plastic products. To meet the needs of molding parts, we need to pay attention to some matters when choosing injection molds and put forward corresponding requirements.

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, peel off, deteriorate the surface condition, and deteriorate the quality of the plastic parts. 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 injection molded parts are directly related to the wear resistance of the surface of the injection 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, and the friction on the surface of the cavity is very large. If the material is not wear-resistant, it will soon wear out and damage the quality of the plastic parts.

3. Good dimensional stability During injection molding, the temperature of the injection mold cavity should reach above 300 ℃. For this reason, it is best to choose 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.

4. Easy to process Most of the mold parts are made of metal materials, and some structural shapes are very complex. To shorten the production cycle and improve efficiency, the mold materials are required to be easy to process into the shape and precision required by the drawings.

5. Good polishing performance Injection plastic parts usually require a good gloss and surface state, so the roughness of the cavity surface is required to be very small. In this way, the surface of the cavity must be surface processed, such as polishing, grinding, etc. Therefore, the selected steel should not contain rough impurities and pores.

6. Less affected by heat treatment To improve the hardness and wear resistance, the injection mold is generally subjected to heat treatment, but this treatment should make the size change very small. Therefore, it is best to use pre-hardened steel that can be machined.

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