What are the functions of heat treatment technology for plastic injection molds

Plastic injection mold is an indispensable key tool in the production process of plastic products. Its quality and performance directly affect the quality and production efficiency of plastic products. In order to improve the hardness, wear resistance and corrosion resistance of plastic injection molds and extend their service life, heat treatment technology has become an important link in the manufacturing process of plastic injection molds.
As a key link in heat treatment technology, quenching treatment can heat the mold to an appropriate temperature and then rapidly cool it, causing the mold's structural structure to undergo phase transformation to form a higher-hardness martensite structure. This can make the surface hardness of the mold reach HRC50-60, greatly improving the wear resistance of the mold and extending its service life.
Tempering treatment is an important step after quenching. Its main function is to eliminate the internal stress generated during the quenching process and improve the toughness and tensile strength of the mold. By heating the quenched mold to an appropriate temperature and then keeping it warm for a period of time, the organizational structure of the mold changes again to form a more uniform organizational structure. This can improve the toughness and tensile strength of the mold, reduce its brittleness, and increase the reliability of the mold.
Nitriding treatment is a heat treatment technology that forms a nitride layer on the surface of the mold. Its main function is to improve the wear resistance and corrosion resistance of the mold. Nitriding treatment can be divided into two methods: gas nitriding and ion nitriding. By placing the mold in nitrogen-containing gases such as ammonia for heating treatment, or by ion beam bombardment, a uniform and dense layer is formed on the surface of the mold. nitride layer. The nitrided layer has high hardness and wear resistance, which can effectively improve the service life and corrosion resistance of the mold.
Carburizing treatment is a heat treatment technology that infiltrates carbon elements into the surface of the mold. Its main function is to improve the hardness and wear resistance of the mold. By placing the mold in a high-temperature, high-carbon-content environment for heat treatment, the carbon element penetrates into the surface of the mold and chemically reacts with the iron element in the mold matrix to form a carbide layer with higher hardness. Such carbide layer has high hardness and wear resistance, which can effectively improve the surface hardness and wear resistance of the mold.
In addition to the above common heat treatment technologies, cooling treatment is also an important link in the heat treatment of plastic injection molds. Its main function is to eliminate the residual stress generated during the heat treatment process and improve the stability and dimensional accuracy of the mold. By placing the heat-treated mold in an appropriate cooling medium and cooling it slowly, the temperature of the mold is evenly reduced, thereby eliminating internal stress and improving the stability and dimensional accuracy of the mold.