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How to choose plastic mold

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How to choose plastic mold
Click number:- Release time:2020-08-12

1.Good dimensional stability

During plastic molding, the temperature of the plastic mold cavity should reach above 300℃. For this reason, it is best to use tool steel that has been tempered properly. Otherwise, it will cause changes in the microstructure of the material and result in changes in the size of the plastic mold.

2.Good abrasion resistance

The gloss and precision of the surface of plastic parts are related directly to the abrasion resistance of the surface of the plastic mold cavity, especially when some plastics are added with glass fiber, inorganic fillers and certain pigments. Together with the plastic melt, it flows fast in the flow channel 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 wear out quickly and damage the quality of the plastic parts.

3.High corrosion resistance

Many resins and additives have a corrosive effect on the surface of the cavity. The corrosion causes the metal on the surface of the cavity to be corroded and peeled off, the surface condition is deteriorated, and the quality of the plastic parts is deteriorated.Therefore,it is best to use corrosion-resistant steel, chromium plating and cymbal nickel on the surface of the cavity.

4.Easily processed

Mold parts are mostly made of metal materials, and some structural shapes are still very complicated. In order to shorten the production cycle and improve efficiency.the mold materials are required to be processed easily into the shape and accuracy required by drawings.

5.Good polishing performance

Plastic and plastic parts usually require good gloss and surface condition, so the roughness of the cavity surface is very small. In this way, the cavity surface must be surface-processed, such as polishing and grinding. Therefore, the selected steel should not contain rough impurities and pores.

6.Less affected by heat treatment

In order to improve the hardness and wear resistance, plastic molds are generally heat treated, but the treatment should make the size change small. Therefore, it is best to use pre-hardened steel that can be cut.

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