There are many requirements for the materials on the plastic molds of Auto Mould Manufacturer. Today we will understand the requirements of plastic molds.

　　 has sufficient surface hardness and wear resistance: the ordinary hardness of the plastic mold is usually below 50-60HRC, and the mold should have sufficient surface hardness after heat treatment to ensure that the mold has sufficient rigidity. When the mold is in operation, the filled and movable plastics receive greater compression stress and friction, and the mold is required to maintain the accuracy of its shape and the stability of the dimensional accuracy to ensure that the mold has sufficient service life. The wear resistance of the mold depends on the chemical composition of the steel and the heat treatment hardness, so the hardness of the mold can be increased to improve its wear resistance.

　　 Machinability: Most plastic molds require a certain level of cutting and fitter repair in addition to EMD processing. In order to extend the service life of the cutting tool, improve the cutting performance, and reduce the surface roughness, the hardness of the plastic mold steel must be appropriate.

　　Good polishing performance: high-quality plastic products require small surface roughness. For example, the surface roughness value of the injection mold cavity is less than Ra0.1 to 0.25, and the optical surface requires Ra<0.01nm, and the cavity must be polished to reduce the surface roughness value. The steel used for this purpose requires less material impurities, fine and average structure, no fiber direction, and polishing should not show pitting or orange peel defects.

Auto Interior Parts Mould factory has good thermal stability: the shape of injection mold parts is often more complex and difficult to process after quenching. Good thermal stability should be used as much as possible. After the mold is processed and heat treated, the linear shrinkage coefficient is small, and the heat treatment deformation is small , Due to the small dimensional change rate, the metallographic structure and mold size are stable, the temperature difference can be reduced or no longer processed, and the requirements of mold dimensional accuracy and surface roughness can be guaranteed.