What are the rules for selecting injection molding materials?
What are the rules for selecting injection molding materials? Reasonable selection of molding materials is the primary task of mold designers. Correctly selecting suitable injection mold materials can help mold designers save a lot of time and avoid many problems. Today we will explain the selection rules for injection mold materials.
Regulations on selecting simple injection molds. Easy processing: mold parts are mostly metal materials, and some structures have complex shapes. In order to shorten the production cycle and improve efficiency, mold materials are required to be easily processed into the shape and precision required by the drawings.
Simple regulations for selecting injection molds 2. Good wear resistance: The gloss and precision of the plastic surface are directly related to the wear resistance of the mold cavity surface. In particular, when some plastics are added with glass fiber, inorganic fillers and some pigments, they flow at high speed in the flow channel and cavity with the plastic melt, generating great friction on the cavity surface. If the material is not wear-resistant, it will wear out quickly, which will damage the quality of plastic parts.
Regulations on selecting simple injection molds. High corrosion resistance: Many resins and additives have a corrosive effect on the surface of the cavity, causing the metal on the surface of the cavity to dissolve and peel off, the surface condition to deteriorate, and the quality of the plastic parts to deteriorate. Therefore, corrosion-resistant steel should be used, or chrome or nickel should be plated on the surface of the cavity.
Injection molding
Provisions for selecting simple injection molds. Good dimensional stability: During injection molding, the cavity temperature should reach above 300. Therefore, select tool steel (heat-treated steel) with appropriate tempering treatment. Otherwise, the microstructure of the material will be changed, resulting in changes in the mold size.
Provisions for selecting easy injection molds V. Small effect of heat treatment: In order to improve hardness and wear resistance, molds are generally heat treated, but this treatment should make the size change very small. Therefore, use machinable pre-hardened steel.
Provisions for selecting simple 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, the surface of the cavity must be polished, ground, and other surface treatments. Therefore, the selected steel should not contain rough impurities, pores, etc.
What are the rules for selecting injection molding materials? The above is an introduction to the selection rules for injection molds, which will help mold designers avoid many detours in material selection, improve enterprise production efficiency and reduce production costs.