Injection mold quality is mainly determined by the material selection of the injection mold. The quality of the mold directly depends on the material selection, so what are the basic requirements for material selection?
Injection molds should have good mechanical processing properties
Most of the production of Injection mold parts is completed by mechanical processing. Good mechanical processing properties are necessary to achieve high-speed processing. This can prolong the life of the processing tool, improve cutting performance, reduce surface roughness, and achieve high-precision mold parts.
Injection molds should have sufficient surface hardness and wear resistance
The surface roughness and dimensional accuracy of plastic products, as well as the service life of injection molds, are directly related to the roughness, hardness, and wear resistance of injection mold surfaces. Therefore, it is required that the forming surface of the injection mold has sufficient hardness, and the quenching hardness should not be lower than 55HRC to obtain higher wear resistance and prolong the service life of the mold.
Injection molds should have sufficient strength and toughness
As Injection molds are repeatedly subjected to the locking force and injection pressure of the injection mold cavity during the molding process, especially large and medium-sized injection molds with complex structural shapes, their mold parts must have high strength and good toughness to meet usage requirements.
Injection molds should have good polishing properties
To obtain plastic products with high-gloss surfaces, the roughness of the forming part surface should be small, thus requiring polishing of the forming part surface to reduce its surface roughness. To ensure polishing performance, the selected materials must not have defects such as pores, roughness, and impurities.
Injection molds should have good heat treatment processability
Mold materials often rely on heat treatment to achieve the necessary hardness, which requires good quenching penetration of the material. The parts of plastic injection molds are often complex in shape and difficult to process after quenching, or even impossible to process. Therefore, mold parts should choose materials with small deformation after heat treatment to reduce the amount of processing after heat treatment.
Injection molds should have good corrosion resistance
Some plastics and additives produce corrosive gases during molding, so the selected materials for Injection molds should have certain corrosion resistance. In addition, nickel plating, chrome plating, and other methods can be used to improve the corrosion resistance of mold cavity surfaces.
Injection mold surface processing properties should be good
Plastic products require a beautiful appearance, and when decorating patterns, the mold cavity surface needs to be etched with chemical patterns. Therefore, mold materials should be easy to etch, clear in patterns, and wear-resistant.