Heat Treatment of Plastic Mould Steels
Steel moulds are the basis of mass production and efficient industrial production. As an important tool material, its performance directly affects the quality of mould products and even affects the success or failure of some industries. The properties of plastic mould steel are closely related to its heat treatment process. The heat treatment process of plastic mould steel includes annealing, normalizing, quenching, tempering and other processes.
The annealing process of plastic mould steel is the most important process that determines the performance of mould steel. The purpose of annealing is to reduce the hardness and internal stress of plastic mould steel, to adjust the internal structure of the material, to improve the machine and cutting performance, to increase the plasticity and toughness of the material, and to improve the overall performance level of the material. According to the different needs of plastic mould steel, quenching and annealing process can be used. Quenching and annealing are important processes to improve the hardness and wear resistance of steel and steel. The quenching process produces a martensite structure in the plastic mould steel, while the annealing process can refine the grains, reduce the hardness, reduce the internal stress and improve the homogenization of the structure.
The normalizing of plastic mould steel is usually used to refine the grains and further improve the homogeneity and isotropy of the internal structures such as quenching and annealing. Normalizing contributes to the uniform hardness, better plasticity and cutting performance, fully play the performance of plastic mould steel, improve the quality of mould products and accuracy of mould products, and enable the heat treatment to meet the technical requirements.
Tempering process is used to reduce the brittleness and hardness of steel. The tempering of plastic mould steel should be carried out in a temperature range from 200 to 400 ℃. The purpose of tempering is to make the matrix microstructure of the plastic mould steel become tempered sorbite. Through tempering, the mechanical properties of the mould steel can be improved significantly, and the hardness of the mould steel can be further reduced, so as to make the steel have better plasticity and toughness, improve the wear resistance and prolong the service life of the mould products.
In conclusion, the heat treatment of plastic mould steel is an important means to improve the performance of plastic mould steel. Plastic mould steel should be properly annealed and quenched and tempered according to their own performance requirements. Through scientific and reasonable heat treatment process, mould steel can obtain uniformly distributed internal structure, ensure high hardness and wear resistance, and produce high quality mould products.
