Core Tip: Mold is an important equipment in the production of various products, and it is the mother machine for manufacturing and processing materials. Therefore, improving the service life of the mold is very important for every processing and manufacturing enterprise, and it is of great significance for the improvement of productivity, the reduction of production costs and the assurance of quality. So, what are the ways to improve the service life of the mold?
For the improvement of the service life of the mold, different companies have different methods. The most commonly used methods, such as: using high-grade alloy materials, although this method can improve the service life of the mold, but due to the high cost of high-grade alloy materials, the cost will rise. Therefore, this method is not suitable for every enterprise to use.
If you want to improve the service life of the mold and save costs, the hook net tells you that you can try to use heat treatment to refine the grains. The use of grain refinement to improve the mechanical properties of the material can simultaneously improve the strength at room temperature and improve the fatigue limit. Moreover, it is relatively simple to obtain fine grains, which can be obtained by appropriate heat treatment. Cyclic ultra-fine heat treatment is a common method in heat treatment to refine grains. It only performs two processes of heating and cooling in cyclic heat treatment, which is a relatively simple and easy grain refinement method.
In the past, cyclic ultra-fine heat treatment was only used to cast Ti-46Al-8.5Nb-0.2W alloys, so that the coarse lamellar structure was transformed into a uniform and fine porridge structure. Now, this heat treatment can also be used for carbon tool steel materials, also achieving ultra-fine grains. Its heat treatment process is to use two salt bath furnaces. Now the workpiece is put into a high temperature salt bath furnace and heated to the normal quenching temperature, and then quickly transferred to another salt bath furnace for cooling. The cycle is repeated, and finally a high temperature is carried out. Quenched and then tempered for two hours.
The machining test shows that the carbides and retained austenite are uniformly distributed in spherical particles, and the martensite is relatively fine in the workpiece after cyclic ultra-fine heat treatment. The service life of the steel motor rotor core punching convex and concave molds can be increased by more than 30% through four cycles of heat treatment, and it has a very obvious effect on reducing the occurrence of cracks.
The above method can be used to obtain a uniform and fine structure. The principle is that the two aspects of rapid heating and cyclic treatment are fully utilized to rapidly heat, generate a large number of austenite nuclei, and appear and obtain fine grains; this The faster the process is carried out and the larger the temperature difference, the better the refinement effect obtained.
Increasing the number of times of this process can also obtain good results. Repeated heating and cooling can promote nucleation on the one hand, and further refine the nucleated crystals on the other hand. Each time it is performed, the austenite grains are refined once, so that the nucleation rate of the next austenitization increases.
Before the process is cycled, the hardness and impact of the sample will increase, and the results of each cycle will be different. The hardness value and impact value will be significantly improved after 3-5 cycles of heat treatment. After the same process, the hardness value and impact value of the sample will not change significantly. 6 or so will approach the limit of refinement. If the cycle is repeated at this time, it will not help much to improve the heat treatment efficiency, so the optimal number of cycles is 4-5 times.
Cyclic ultra-fine heat treatment is one of the effective methods to improve the fine blanking die. Although the process is relatively complicated, the effect is obvious for the results. But the problem most companies are facing now is that they don't know enough about this process, and they need expert guidance and help. Duigou.com is a website dedicated to the processing and manufacturing industry. While providing information on outsourcing processing, it also provides technical support for the majority of practitioners to help enterprises solve various problems they face.