Vacuum heat treatment furnaces have very high requirements for vacuum systems, with strict requirements for every indicator. So, what are the commonly used vacuum systems for vacuum heat treatment furnaces?
The vacuum system needs to meet the following three basic requirements:
Can quickly pump the vacuum heat treatment furnace to the required ultimate vacuum degree.
It should be able to promptly discharge the gas continuously released from the processed workpiece and structural components in the furnace, as well as the gas that seeps into the furnace due to vacuum leakage.
The operation, installation, and maintenance should be simple, and the entire system should have a small footprint.
Vacuum heat treatment is a new type of heat treatment technology that combines vacuum technology and heat treatment technology. The vacuum environment in which vacuum heat treatment is carried out refers to an atmosphere environment below one atmosphere, including low vacuum, medium vacuum, high vacuum, and ultra-high vacuum. Vacuum heat treatment actually belongs to atmosphere controlled heat treatment. Vacuum heat treatment refers to all or part of the heat treatment process being carried out in a vacuum state, greatly improving the quality of the heat treatment. Compared with conventional heat treatment, vacuum heat treatment can achieve non oxidation, non decarburization, and non carburizing, remove phosphorus chips from the surface of the workpiece, and have functions such as degreasing and degassing, thus achieving the effect of surface brightness purification.
The composition of a vacuum system: The vacuum system of a vacuum heat treatment furnace generally consists of vacuum pumps, vacuum valves, vacuum measuring instruments, cold traps, pipelines, and other parts. The following introduces several common vacuum systems.
Low vacuum system, suitable for vacuum heat treatment furnaces with a vacuum degree in the range of 2-1333 Pa. This system is commonly used in well vacuum furnaces,
A vacuum system with a mechanical booster pump is suitable for vacuum heat treatment furnaces with a vacuum degree in the negative 1Pa range of 1.33-3 × 10. This system is widely used in vacuum quenching furnaces.
High vacuum system and high vacuum system with booster pump are suitable for vacuum heat treatment furnaces with a vacuum degree ranging from negative 2 to negative 4Pa of 1.3 × 10 to 6.6 × 10. This system is commonly used in vacuum annealing furnaces and vacuum brazing furnaces.
Selection of vacuum system:
Select a suitable vacuum pump based on the technical conditions for using the vacuum heat treatment furnace and the required vacuum degree. According to the type and specifications of the vacuum pump, corresponding vacuum valves, vacuum pipelines, etc. are selected to form the required vacuum system. Generally, there is a certain relationship between the volume to be pumped and the pumping speed of the vacuum pump. After determining the volume of the vacuum heat treatment furnace, the corresponding pumping rate can be found, and then the vacuum pump can be selected accordingly.
