What are the rules for the selection of injection molding materials?

Correct selection of the right injection mold material can help mold designers save a lot of time and avoid many problems. Today we will explain the selection rules for injection mold materials.

Provisions on the selection of injection molds. Easy to process: Most of the mold parts are metal materials, and some of them have complex structures and shapes. In order to shorten the production cycle and improve efficiency, mold materials are required to be easily processed into the shape and accuracy required by the drawings.

Injection mold selection regulations. Good wear resistance: The gloss and accuracy of the plastic part surface are directly related to the wear resistance of the mold cavity surface. In particular, when glass fiber, inorganic fillers and some pigments are added, some plastics flow at high speed with the plastic melt in the flow channel and cavity, creating great friction on the surface of the cavity. If the material is not wear-resistant, it will wear out quickly, which will damage the quality of the plastic parts.

Provisions on the selection of injection molds. High corrosion resistance: Many resins and additives corrode the surface of the cavity, causing the metal on the surface of the cavity to dissolve and peel off, deteriorating the surface condition, and deteriorating the quality of the plastic parts. Therefore, corrosion-resistant steel should be used, or chrome or nickel plated on the surface of the cavity.

injection molding

Provisions for selecting injection molds. Good size stability: During injection molding, the mold cavity temperature should reach above 300. Therefore, select a tool steel (heat treated steel) that is appropriately tempered. Otherwise, the microstructure of the material will be changed, resulting in changes in the mold size.

Provisions on the selection of injection molds 5. Heat treatment has little impact: In order to improve hardness and wear resistance, molds generally need to be heat treated, but this treatment requires a small change in size. Therefore, machinable pre-hardened steel is used.

Provisions on the selection of injection molds. Good polishing performance: Plastic parts usually require good gloss and surface condition, so the surface roughness of the cavity is very small. In this way, surface treatments such as polishing and grinding must be carried out on the surface of the cavity. Therefore, the selected steel should not contain rough impurities, pores, etc.