Plastic molds can be classified into thermosetting mold […]
Plastic molds can be classified into thermosetting molded plastic molds and thermoplastic molded plastic molds according to molding curing. Thermoset molding plastic molds, such as compression molding molds, work as a solid powder or preform in plastic, participate in the cavity and are hot pressed at a certain temperature. Thermoplastic molding plastic molds, such as injection molds, kneading molds, plastics in the viscous flow state through the injection, kneading and other methods into the cavity and processing.
Carburized plastic mold steel is mainly used in cold kneading plastic molds. Generally, the carbon content is low, and the carbon content is 0.1% to 0.25%. In the steel, Cr and Ni elements are added to improve the hardening of steel. Sex, and the effect of solid solution strengthening on ferrite is also small, and the content of Si should be as low as possible. After cold kneading, such steels generally require carburizing and quenching and tempering treatment, which can make the mold cavity surface have high hardness and wear resistance, and the appearance hardness can reach 58-62HRC, while the center part has better. Resilience. .
When producing plastic products of chemically corroded plastics such as polyvinyl chloride, polystyrene and ABS plus flame retardant resin, corrosive gases are decomposed during the forming process, and the mold is corroded. Therefore, the mold data must be compared. Good anti-corrosion function. In addition to the outstanding corrosion function, the corrosion-resistant plastic mold steel requires the same functional requirements as hardness, strength and wear resistance, as well as other types of plastic mold steel.