How To Choose The Right Materials For Mold Accessories Is The Key To The Smooth Production Of Molds

1. Good machinability. Steel grades that are easy to cut and can obtain high-precision parts after machining shall be selected. 2. Excellent polishing performance. The working surface of injection molded parts needs polishing to reach the mirror surface, RA ≤ 0.05 μ m。 The hardness of steel shall be HRC35 ~ 40. Polishing will make the surface too hard. The microstructure of steel shall be uniform and dense, with few impurities, defects and needle spots. 3. Good wear resistance and fatigue resistance. The injection mold cavity is not only scoured by the high-pressure plastic melt, but also affected by the alternating stress of cold and hot temperature. General high carbon alloy steel can obtain high hardness after heat treatment, but it has poor toughness and is easy to form surface cracks, so it is not suitable for use. The selected steel shall enable the injection mold to reduce the number of polishing and mold repair, maintain the dimensional accuracy of the cavity for a long time, and reach the service life of the planned mass production. 4. Corrosion resistance. For some plastics, such as PVC and flame retardant plastics, steel with corrosion resistance must be considered