Requirements for plastic mold materials

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The working conditions of plastic molds and cold stamping molds are different, they usually work at a temperature of 150 ° C - 200 ° C, in addition, they must withstand a certain pressure and temperature. According to the use conditions of plastic molds, different processing methods will summarize the basic performance requirements of steel for plastic molds.

sufficient surface hardness and wear resistance
The hardness of the plastic mold is generally lower than 50-60HRC, after heat treatment, the mold should have sufficient surface hardness to ensure sufficient rigidity of the mold. The mold in operation is subject to high compressive stress and friction due to filling and flow of plastic, the requirements for the mold are to maintain cayman islands number data the accuracy of the shape and dimensional stability to ensure sufficient service life of the mold. The wear resistance of the mold depends on the chemical composition of the steel and the hardness of the heat treatment, so increasing the hardness of the mold helps to improve its wear resistance.

excellent machinability
Most plastic molds, in addition to EMD processing, also require a certain amount of cutting and clamp repair. In order to extend the service life of cutting tools, improve cutting performance and reduce surface roughness, the hardness of the steel for plastic molds should be appropriate.

good polishing properties
For high-quality plastic products, the surface roughness value of the cavity is required to be low. For example, the cavity of the injection mold requires a surface roughness value of less than Ra0.1 ~ 0.25 level, the optical surface requires Ra<0.01nm, the cavity must be polished to reduce the surface roughness value.