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Material Requirements For Plastic Moulds
- Jun 13, 2017 -

1, enough surface hardness and wear resistance; the hardness of the plastic mould is usually below 50-60, and the mould with heat treatment should have enough surface hardness to ensure the mould has enough rigidity. 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 processing: most plastic molding mold, in addition to EMD processing also need to carry out a certain amount of cutting 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, the requirements of the cavity surface roughness value small. For example, the surface roughness value of the injection molded cavity is less than Ra0.1.25, the optical surface is required for Ra. 01NM, the cavity must be polished to reduce the surface roughness value. To this end, the selection of steel materials requires less impurities, microstructure, no fiber directionality, no pitting or orange peel defects when polishing.