Injection Mold Selection Requirements

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A mold is a tool for producing plastic products. It consists of a combination of several sets of mold parts

    A mold is a tool for producing plastic products. It consists of a combination of several sets of mold parts, such as a straight ejector pin. This combination has a forming cavity. During injection molding, the mold is clamped on the injection molding machine, the molten plastic is injected into the molding cavity, and cooled and shaped in the cavity, and then the upper and lower molds are separated, and the product is ejected from the cavity through the ejection system to leave the mold, and finally, the mold is closed again. For the next injection, the entire injection process is cyclic.

    The following are the requirements for a reasonable selection of injection molds:

  1. High corrosion resistance Many resins and additives have a corrosive effect on the surface of the cavity. This corrosion causes the metal on the surface of the cavity to corrode, peel off, deteriorate the surface condition, and deteriorate the quality of the plastic parts. Therefore, it is best to use corrosion-resistant steel, or chrome-plated or cymbal-nickel on the cavity surface.
  2. Good abrasion resistance The gloss and precision of the surface of injection molded parts are directly related to the abrasion resistance of the surface of the injection mold cavity, especially when glass fibers, inorganic fillers, and certain pigments are added to some plastics, they Together with the plastic melt, it flows at a high speed in the runner 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 quickly and damage the quality of the plastic parts.
  3. Good dimensional stability During injection molding, the temperature of the injection mold cavity should reach above 300 °C. For this reason, it is best to choose tool steels (heat-treated steels) that have been appropriately tempered. Otherwise, it will cause changes in the microstructure of the material, resulting in changes in the dimensions of the injection mold.
  4. Easy to process Most of the mold parts are made of metal materials, and some of the structures and shapes are very complex. In order to shorten the production cycle and improve efficiency, the mold materials are required to be easy to process into the shape and precision required by the drawings.

    Taizhou Huangyan Jinhong Plastic Mould Parts Co., Ltd. is an injection mold maker from China Ejector sleeve, its own plastic mold factory specializes in the production of ejector sleeves and other products

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