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Material requirements for plastic moulds
Nov 20, 2017

The working condition of the plastic mould is different from the cold stamping die, generally must work under the 150°c-200°c, besides under the certain pressure effect, but also must withstand the temperature influence. Based on the use of plastic molding mold conditions, the different processing methods of plastic mold steel basic performance requirements are summarized as follows:

1, enough surface hardness and wear resistance

The hardness of the plastic mold is usually below the 50-60HRC, 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. Excellent cutting and processing property

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.

3. Good polishing performance

High-quality plastic products require that the surface roughness of the cavity is small. For example, the surface roughness of the injection molded cavity requires less than the ra0.1~0.25 level, the optical surface requires ra<0.01nm, the cavity must be polished, and the surface roughness is reduced. To this end, the selection of steel materials requires less impurities, microstructure, no fiber directionality, no pitting or orange peel defects when polishing.

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