A New Technology to Extend the Service Life of Hot Pressing Grouting Mold
The mature powder metallurgy process is widely used in machinery and other industries. The quality and life of Hot Pressing Grouting Mold are important factors in determining the quality and life of powder metallurgy parts. Therefore, it is very important to improve the quality and life of mold. The use of cryogenic treatment can improve the wear resistance of steel in order to achieve the quality and life of the Hot Pressing Grouting Mold, parts quality and life will be increased.
Hot Pressing Grouting Mold is usually due to wear and tear caused by parts of the size of the deviation caused. Tool steel in the heat treatment in the metallographic phase will usually leave a lot of austenite, the use of molds prone to organizational changes, resulting in tissue stress, resulting in early damage from the Hot Pressing Grouting Mold, especially when the residual austenite more than 5% of the time, will be obvious Reduce the strength and abrasion resistance of the material.
In the powder metallurgy industry widely used Gr15 steel as a Hot Pressing Grouting Mold material, but in use with Gr15 steel mold quality and life are low, so the use of cryogenic treatment to improve the wear resistance of steel, and ultimately improve the hot pressing Quality and life of the mold.
After a series of experiments, Gr15 steel in the normal Hot Pressing Grouting Mold treatment still remains more austenite, cryogenic treatment is the best way to reduce the austenite residue. When the temperature of the cryogenic treatment is reduced to -140 ° C or less, the amount of retained austenite is substantially stable.
After the cryogenic treatment, the toughness of the GR15 steel does not change, but the strength is slightly increased. This is because the cryogenic treatment changes the austenite to the martensite, the organization is more refined, the hardness is enhanced, so the overall strength of the GR15 steel The quality of the hot-press grouting mold is remarkably improved.
Experiments show that the Hot Pressing Grouting Mold reduces the amount of austenite after the cryogenic treatment, increases the toughness and strength, thus significantly improves the quality and life of the mold, and the economy of the mold is further improved. Cryogenic treatment is a method worthy of popularization and use, on the basis of which we have to continue to study the effect of a better way to make Hot Pressing Grouting Mold quality and life again.
When the equipment is in the process of processing, in the processing area of the hot press grouting mold, and its adjacent area, there will be a sharp drop in temperature, and when the temperature drops to the critical point of the workpiece material, The structure of the metallographic changes. If it is for the general and more common way of cutting, then the basic will not appear to increase the phenomenon.
But we are grinding in the processing, not only grinding in the pressure will be relatively large, and the grinding speed is very high, the metal in the power loss on the cut, this approach is actually undesirable , Due to the energy consumed in the processing, and ultimately the basic will be converted into heat, and such a larger part of the heat, it will be directly transferred to the processing process to go, and ultimately lead to Hot Pressing Grouting Mold in the processing A higher temperature appears.
If it is to deal with the already quenching Hot Pressing Grouting Mold, the higher the temperature will lead to the surface of the technology in the metallographic structure changes, to promote the entire metal surface hardness in a serious reduction, resulting in the workpiece oxide film color Class phenomenon we can call the grinding of the burn, because the grinding process is more often change the way, so in the grinding and processing process, often the phenomenon of burns, and ultimately lead to the machine in the use of The performance on the decline.