1, enough surface hardness and wear resistance
The hardness of the plastic mold is usually below the 50-60, after the heat treatment of the mold should have enough surface hardness to ensure that the mold has enough stiffness. Die in the work due to plastic filling and flow to withstand greater pressure and friction, the mold to maintain the shape of precision and dimensional accuracy of stability, to ensure that the mold has enough service life. The wear resistance of the mould depends on the chemical composition of the steel and the hardness of the heat treatment, so the hardness of the mould enhances its abrasion resistance.
2, good cutting processing
Most plastic molding molds, in addition to EMD processing also need to carry out a certain amount of machining and fitter repair. In order to prolong the service life of cutting tool, improve cutting performance and reduce surface roughness, the hardness of steel for plastic mould must be suitable.