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What are the basic material requirements for injection molding?

release time:2017-09-22 | Article Source:

What are the basic material requirements for injection molding?

Reasonable selection of mold material is the most important task for mold designers. Generally, the basic requirements for mold materials are as follows.

1. easy processing, mold parts are made of metal material, some structural shapes are complex, in order to shorten the production cycle and improve the efficiency requirements of die material can be easily processed into the required shape and precision drawings.

2. good wear resistance and surface gloss of plastic precision has direct relation with the wear resistance of the die cavity surface, especially some plastics added glass fiber, inorganic fillers and certain pigments, and they melt together in the flow passage, the cavity of high speed flow, great friction cavity surface, if the materials do not wear, will soon wear, the quality of plastic damage.

3. high corrosion resistance, a lot of resin and additives on the cavity surface corrosion, this corrosion makes the cavity surface metal corrosion and peeling, the surface condition worse, plastic parts become worse. Therefore, it is better to use corrosion-resistant steel, or the surface of the cavity chrome plating, nickel plating.

4.. Good dimensional stability. When molding, the mold cavity temperature should be above 300. For this reason, it is better to choose the tool steel (heat treated steel) which has been properly tempered. Otherwise, the microstructure of the material will be changed, resulting in the change of the mold size.

5. in order to raise the heat treatment effect on hardness and wear resistance, mold to heat treatment, but the treatment should be very little change in size. Therefore, it is better to use pre hardened steel which can be machined by cutting.

6., good polishing performance, plastic parts usually require good gloss and surface state, so require the cavity surface roughness is very small, so that the surface of the cavity must be surface processing, such as polishing, grinding and so on. Therefore, the choice of steel should not contain rough impurities and pores.


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