Classification of low pressure vacuum carburizing furnace

Low pressure vacuum carburizing vacuum furnace mainly includes: double chamber high pressure gas cooled vacuum furnace, double chamber oil quenching pressurized gas cooled vacuum furnace, single chamber high pressure gas cooled vacuum furnace (upper and lower alternate gas cooling), single chamber high pressure gas cooled vacuum furnace (360 ℃ gas cooling). Because the airtight door of the heating chamber is separated from the transfer chamber, the heating chamber is always in the hot state, so the heating rate of the cold workpiece entering the hot chamber is relatively high, so the heating time is saved and the production efficiency is improved.

Due to the structural characteristics of single chamber furnace single chamber carburizing gas quenching furnace, the furnace door must be opened during each feeding and discharging, so that the whole hot zone is exposed to the atmosphere. Because most of the components in the hot zone are made of graphite material with high suction rate, it takes a relatively long time to establish the working vacuum degree in the heating and vacuumizing process after each feeding. In addition, because the heat conduction of vacuum heating at low temperature mainly depends on convection, the single chamber vacuum furnace must be equipped with low-temperature convection heating fan and filled with nitrogen to improve the heating speed of low-temperature section, which not only complicates the structure, but also increases the production cost.

Double chamber furnace The hot zone is always kept in vacuum and high temperature. When the cold workpiece enters the hot chamber, the furnace temperature drops to 750 ℃. The heat transfer mainly depends on radiation heat transfer. Therefore, the double chamber furnace can achieve rapid heating without installing low-temperature convection heating device. Based on the above reasons, the vacuum technology network thinks that the double chamber vacuum furnace has faster heating speed than the single chamber vacuum furnace Heating speed and higher production efficiency.


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