One, excellent cutting and processing
Most aluminum alloy die casting mold, in addition to CNC machine tool processing, but also need to carry out a certain amount of cutting and clamp repair. In order to extend the service life of the cutting tool, enhance the cutting performance, reduce surface roughness, plastic mold steel hardness must be appropriate, so as not to aluminum alloy die casting plant caused by excessive consumption of cutting tools.
Two, good thermal stability
Aluminum alloy die casting mold parts shape is often complex, hard to process after quenching, therefore, should try to choose has good thermal stability. When aluminum alloy die-casting mold molding process after heat treatment, because the coefficient of linear expansion is small, heat treatment deformation is small, the temperature difference caused by the size of the rate of change is small, the metallurgical organization and the mold size is stable, can reduce or no longer be processed, you can ensure that the mold dimensional accuracy and surface roughness requirements.
Three, good polishing performance
High quality aluminum alloy die casting, require cavity surface roughness value is small. So aluminum alloy die casting factory must be on the cavity shall be polished, reduce the surface roughness value. To this end, the choice of steel requirements material impurities, organization micro fine uniform, no fiber direction, polishing should not appear pitting or orange peel defects.
Four, sufficient surface hardness and wear resistance
The heat-treated mold should have sufficient surface hardness to ensure that the mold has sufficient rigidity. Mold in the work, due to the filling and flow of aluminum alloy liquid to withstand greater pressure and friction, the mold is required to maintain shape accuracy and dimensional accuracy of the stability of the mold to ensure that the mold has sufficient service life.
The wear resistance of the mold depends on the chemical composition of the steel and heat treatment hardness, therefore, improve the hardness of the mold is conducive to the enhancement of its wear resistance.
In addition, in the selection of materials, we must also consider the prevention of abrasion and gluing, such as the existence of two surfaces of the relative movement, try to avoid choosing the same organizational structure of the material, in special circumstances, can be plated on one side or nitriding, so that the two sides of the surface with a different structure.