Material selection requirements for processing and manufacturing injection molds

1. Excellent polishing performance

High-quality injection molded products require a small roughness value on the surface of the cavity. For example, the surface roughness value of the injection mold cavity is required to be less than Ra0.1-0.25, and the optical surface requires Ra<0.01nm, and the cavity must be polished to reduce the surface roughness value. For this reason, the selected steel requires less material impurities, fine and uniform arrangement, no fiber orientation, and no pitting or orange peel defects during polishing.

2. Excellent thermal stability

The shape of the parts of plastic injection molds is often complex and difficult to process after quenching. Therefore, materials with excellent thermal stability should be selected as far as possible. When the plastic mold is heat treated, the coefficient of linear expansion is small, the heat treatment deformation is small, the standard change rate caused by the temperature difference is small, the metallographic arrangement and the mold standard are stable, and it can be reduced or no longer processed to ensure the plastic mold standard. Accuracy and surface roughness requirements.