Mold vacuum heat treatment process

What is the vacuum heat treatment process of the mold? With the rapid development of machinery manufacturing industry, as an important part of machinery processing industry, the demand and importance of heat treatment processing are more and more obvious. The development of heat treatment is accompanied by the development of mechanical manufacturing industry, which puts forward higher requirements for heat treatment.

Mold vacuum heat treatment process

We all know that mold heat treatment is to play to the potential of mold materials, improve the performance of the mold. Die performance must meet: high strength, (including high temperature strength, cold and hot fatigue resistance) high hardness (wear resistance) and high toughness, but also requires good machining, (including good polishing) weldability and corrosion resistance and so on.

The biggest impact on the life of the mold is the mold design (including the correct choice of materials) mold materials, mold heat treatment, mold use and maintenance. If the mold design is reasonable and the material is high quality, then the heat treatment directly determines the service life of the mold. At present, both at home and abroad are trying to adopt more advanced heat treatment means to improve the performance of the mold and prolong the service life of the mold. Vacuum heat treatment is one of the advanced methods in mold heat treatment. So from the point of view of mold heat treatment, heat treatment processing equipment state, heat treatment process, production process control is particularly important. And the advanced nature of equipment is the premise that assures advanced technology to realize. Vacuum high-pressure gas quenching furnace is the most ideal equipment for vacuum heat treatment. Vacuum furnace has the effect of non-decarbonization, non-oxidation, with uniform temperature, heating and cooling speed is controllable, can achieve different process, vacuum furnace because there is no pollution, is the internationally recognized “green heat treatment”. Currently, there are 2-20bar vacuum high-pressure gas quenching furnaces in the world, which can completely meet the requirements of vacuum heat treatment of molds.

In the process of mold heat treatment, the process parameters adopted also have a crucial impact on the mold performance: it includes the heating temperature, heating speed, holding time, cooling mode, cooling speed, etc. Correct heat treatment parameters can ensure the best performance of the mold, otherwise, it will produce adverse and even serious consequences. The practice shows that good microstructure can be obtained by proper heat treatment process, and good microstructure can ensure good mechanical properties. Suitable process method can effectively control the deformation and cracking of mold during heat treatment. It is found from practice that the difference between the surface temperature and the core temperature (the inhomogeneity of heating and the inhomogeneity of cooling) is the main factor that causes the deformation of the mould in the process of heating and cooling. Vacuum furnace has the ability to control the heating speed and cooling speed. Different process methods can make the mold meet different service conditions and different performance requirements.

From the point of view of the service life of the mold, meeting the requirements of hardness is only one aspect of meeting the technical requirements of the mold, it also has some performance requirements that are not easy to measure, such as strength and toughness and so on. Mold quality is not entirely to investigate with hardness index, it impossible for hardness measurement method to test out the service life of die eventually, as a special heat treatment process (i.e., special process), it can only through the process validation, performance test, confirm the reasonable process parameters, and strictly implement the process parameters of the confirmed process (process control) to ensure the reliability and stability of product quality. A large number of data show that the deformation of cold blanking dies processed by vacuum heat treatment is small, and linear cutting and grinding cracks are rare. Die casting die using advanced technology, to a certain extent to reduce the mold cracks and the use of sticky die phenomenon.

In a word, the vacuum high-pressure gas quenching process has the advantages of free control of heating and cooling speed, and can compile different process parameters to obtain the desired microstructure and properties. If you want to learn more about heat treatment, you can pay attention to the SIMUWU vacuum furnace.