Now with the rapid development of the machinery manufacturing industry, as an important part of the mechanical processing industry, the demand and importance of heat treatment processing are becoming more and more obvious. The development of heat treatment is accompanied by the development of mechanical manufacturing. Mechanical manufacturing has put forward new and higher requirements for heat treatment. The heat treatment of mold is the most technical part of heat treatment.

As we all know, mold heat treatment is to play the potential of mold materials and improve the performance of the mold. The performance of the mold must meet: high strength, including high temperature strength, resistance to thermal fatigue, high hardness (wear resistance) and high toughness, and also requires good machinability, including good polishability. ) weldability and corrosion resistance, etc.

The greatest impact on mold life is the design of the mold (including the correct selection of materials), the material of the mold, the heat treatment of the mold, the use and maintenance of the mold. If the design of the mold is reasonable and the material is of high quality, then the quality of the heat treatment directly determines the service life of the mold. At present, domestic and foreign companies are trying to adopt more advanced heat treatment methods to improve the performance of the mold and prolong the service life of the mold. Vacuum heat treatment is one of the more advanced methods in mold heat treatment. Therefore, from the perspective of mold heat treatment, the state of the heat treatment processing equipment, the heat treatment process, and the control of the production process are particularly important. The advanced nature of the equipment is a prerequisite for ensuring the realization of advanced processes. Vacuum high pressure gas quenching furnace is the most ideal equipment for vacuum heat treatment. The vacuum furnace has the effect of no decarburization, non-oxidation, uniform temperature, controllable heating and cooling speed, and can realize different processes. The vacuum furnace is internationally recognized as “green heat treatment” because it has no pollution. Now there are 2-20bar vacuum high pressure gas quenching furnaces in the world, which can fully meet the requirements of vacuum heat treatment of molds.

During the heat treatment of the mold, the process parameters used also have a crucial influence on the mold performance: it includes heating temperature, heating speed, holding time, cooling method, cooling rate and the like. The correct heat treatment process parameters can ensure the best performance of the mold, and vice versa, will produce adverse or even serious consequences. Practice has shown that the correct heat treatment process can obtain excellent microstructure, and excellent microstructure can ensure excellent mechanical properties. A suitable process can effectively control the deformation and cracking of the mold during heat treatment. It has been found from practice that during the heating and cooling process, the difference between the mold surface temperature and the core temperature (heating unevenness and cooling unevenness) is the main factor causing the deformation of the mold. (The vacuum furnace has the ability to control the heating rate and cooling rate). Different processes allow the mold to meet different conditions of use and different performance requirements.

From the perspective of the service life of the mold, the requirement to meet the hardness is only one aspect of the technical requirements of the mold, and some performance requirements are not well measured, such as strength and toughness. The quality of the mold can not be completely determined by the hardness index. It is impossible to use the hardness measurement method to finally verify the service life of the mold. The heat treatment is a special process (ie special process), which can only pass the process verification, performance test. Confirm reasonable process parameters and strictly implement the confirmed process parameters (process process control) to ensure the reliability and stability of product quality. A large amount of data shows that the cold stamping die processed by vacuum heat treatment has less deformation and less cracking and cracking of wire cutting. The die-casting mold adopts an advanced process method to reduce the cracking of the mold and the phenomenon of sticking in use to a certain extent.
In summary, the vacuum high pressure gas quenching process has the advantage of free control of heating and cooling rates, and can be programmed with different process parameters to achieve the desired metallographic structure and properties.

Special Customized Bearing

All Non-Standard Bearing,Slewing Bearing,Thin Section Bearing,Nylon Bearing For Garage Door

Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.lsjgbearing.com