Tectonic Variation of Metallographic Structure in Mold Production Of Ceramic Products
When the equipment in the processing process, in the ceramic mold production area, and its adjacent area, there will be a sharp decline in temperature, and when the temperature dropped to the workpiece material critical point, it will 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 , Mold Production Of Ceramic Products Due to the energy consumed in the processing, and ultimately the basic will be converted into heat, and this relatively large part of the heat, it will be directly transferred to the processing process to go, and ultimately lead to ceramic products in the production of mold Higher temperature.
If it is against the already quenched Mold Production Of Ceramic Products, 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, such Phenomenon we can call the grinding of the burn, Mold Production Of Ceramic Products 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 use The performance of the decline.
The mature powder metallurgy process is widely used in machinery and other industries. The quality and life of ceramic mold production is an important factor in determining the quality and life of powder metallurgy parts. Therefore, Mold Production Of Ceramic Products 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 mold, parts quality and life will be increased.
Ceramic mold production is usually due to wear and tear caused by part size deviation caused by scrapped. Tool steel in the heat treatment in the metallographic phase will usually leave a lot of austenite, Mold Production Of Ceramic Products the use of molds prone to organizational changes, resulting in tissue stress, resulting in early damage from the mold, especially when the residual austenite over 5% Reduce the strength and abrasion resistance of the material.
In the powder metallurgy industry widely used Gr15 steel as a 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 ceramic mold Production quality and life.
After a series of experiments, Gr15 steel in the normal heat 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 lower, the amount of retained austenite is substantially stable.
After the cryogenic treatment, the toughness of the GR15 steel is not changed, but the strength is slightly increased. This is because the cryogenic treatment changes the austenite to the martensite, Mold Production Of Ceramic Products the organization is more refined and the hardness is enhanced. Therefore, the overall strength of the GR15 steel Improve the quality of the ceramic products produced by the mold significantly improved.
Experiments show that the Mold Production Of Ceramic Products after the cryogenic treatment to reduce the amount of austenite, increased toughness and strength, which significantly improved the quality and life of the mold, mold economy is further improved. Cryogenic treatment is a method worth promoting and using, on the basis of which we have to continue to study the effect of a better way to make the ceramic mold production quality and life again.