Based on the different working conditions and processing methods of injection molds, the basic performance requirements of injection mold steel are summarized as follows: Sufficient surface hardness and wear resistance. The hardness of injection mold steel is usually below 50-60 HRC. After heat treatment, the injection mold should have sufficient surface hardness to ensure sufficient hardness of the injection mold. Because the injection mold is filled under high pressure, high friction, and high flow conditions, the accuracy of the injection mold is required to maintain the stability of the mold's shape and dimensional accuracy, ensuring the service life of the injection mold. The wear resistance of the injection mold depends on the chemical composition and heat treatment hardness of the steel, thus improving the hardness of the injection mold. 2. Good machinability. In addition to EDM processing, most plastic molding dies also require a certain amount of cutting and assembly. To extend the service life of the mold, improve cutting performance, and reduce surface roughness, the hardness of the plastic mold must be appropriate. 3. Good polishing performance. High-quality plastic products require less cavity surface roughness. For example, the surface roughness of the injection mold cavity is required to be less than Ra 0.1~0.25, while optical surfaces require Ra < 0.01 nm. To reduce surface roughness, the cavity must be polished. The selected steel requires fewer impurities, a uniform structure, no fiber orientation, and no pitting or orange peel defects during polishing. 4. Good thermal stability. The shape of plastic injection mold parts is more complex and difficult to quench, so it should be selected to have good thermal stability as much as possible. After heat treatment, the mold processing has a small linear expansion coefficient, small heat treatment deformation, small size change rate caused by temperature difference, stable microstructure and mold size, which can reduce or eliminate further processing, and can ensure the dimensional accuracy and surface roughness requirements of the injection mold.
Case Study
Challenge:
Air pollution is terrible. You can quote me on that. I distinctly remember driving to Beijing when I was a kid, through the industrial hell of Hebei province. Our 1999 Chevy minivan didn't have air conditioning, but my mom insisted we roll up the windows to keep as much of the toxic fumes (and our young lungs) out as possible. But the results weren't very good. Anyway, look at pictures of Gary from the 1990s online. It's unbelievable!
HUIWEN Solution:
Fortunately, since the establishment of the Environmental Protection Agency, significant progress has been made in air pollution control. We partnered with a local pollution control equipment manufacturer to build a scrubbing tower constructed entirely of polypropylene sheets, pipes, and fittings. It's a small but important part of a larger pollution control system.
Results:
Cleaner air means everyone wins! If you drive through Gary today, the air will be much cleaner. We are happy to be a part of making our planet cleaner.
