● Heat treatment process of carbon tool steel
The heat treatment process of carbon tool steel is performed with reference to the iron-carbon alloy phase diagram, and the heat treatment process is simple. Disadvantages are poor hardenability, narrow quenching temperature range, large deformation after quenching, poor hardenability, easy cracking during quenching, and less use in cold blanking dies with high dimensional accuracy requirements, large bearing capacity and complex shapes.
● Heat treatment process of low alloy cold work die steel
High-carbon low-alloy cold work die steel has high hardenability, wear resistance, toughness and service life. The heat treatment process for this type of mold material with large batches and complicated structure processes is low temperature tempering plus medium temperature salt bath quenching.
● Heat treatment process of high alloy cold work die steel
High-alloy cold work die steels (such as Cr12 die steel, Cr12MoV die steel, etc.) belong to the bainite steel material and contain many eutectic carbide elements. Because the raw material contains many band-like or mesh-like structure components, the blank must be processed Forging was repeated, and then spheroidizing annealing was performed after quenching at 1200 ° C. This method can improve the toughness of the steel, and it can also make the quenched structure fine.
● Heat treatment process of high speed steel
Because high-speed steel belongs to the martensitic steel, it has high hardness, compressive strength and wear resistance. Therefore, low temperature quenching and tempering are often used in the industry to improve its mechanical properties. The tempered structure is tempered martensite, Alloy carbides and a small amount of retained austenite. In order to reduce the amount of retained austenite, multiple tempering should be performed to eliminate the retained austenite.
● Heat treatment process of cemented carbide
Because cemented carbide is powder metallurgy with an adhesive, forging and heat treatment cannot be used to improve its process performance.
According to the above analysis and our usual work and production experience, it can be seen that the important factors affecting the service life of the blanking die are the working conditions of the die, the working conditions of the blanking die, the failure form, the heat treatment process of the die, and the choice of die materials. Therefore, the analysis of the failure form of the punching die, combined with the reasonable selection of the die steel and the development of the heat treatment process, can effectively exert the various excellent characteristics of the punching die and the die steel, thereby further improving the life cycle of the die.