Six requirements for purchasing plastic moulds

Update:15-11-2019
Summary:

The following selection of plastic mold requirements me […]

The following selection of plastic mold requirements meet the six requirements.

1. High Corrosion Resistance Many resins and additives have corrosive effects on the surface of the cavity. This corrosion causes the surface of the cavity to corrode and fall off, the surface condition deteriorates, and the quality of the molded part deteriorates. Therefore, it is best to use corrosion-resistant steel or chrome-plated, nickel-plated surfaces on the cavity surface.

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 plastic mold cavity, especially when some plastics add glass fiber, inorganic filler and some pigments, they Together with the plastic melt, it idles in the flow channel and the cavity, and the friction on the surface of the cavity is very large. If the material is not wear-resistant, it will wear quickly and the quality of the plastic part will be harmed.

3, excellent dimensional stability In the plastic molding, the temperature of the plastic mold cavity should reach above 300 °C. For this reason, it is best to use 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 dimensions of the plastic mold.

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

5, good polishing performance Plastic parts generally require excellent gloss and surface condition, so the surface roughness of the cavity is required to be very small, so that it is necessary to surface processing the surface of the cavity, such as polishing, grinding and so on. Therefore, the selected steel should not contain rough impurities and pores.

6. Small effect by heat treatment In order to improve the hardness and wear resistance, the plastic mold is generally heat treated, but this treatment should have a small change in its scale. Therefore, it is preferable to use a pre-hardened steel which can be machined.

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