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The development history of vacuum carburizing furnace

    Compared with gas carburizing, low-pressure carburizing can not only form an oxide-free and pollution-free surface, but also combine carburizing and gas quenching to improve the deformation behavior of parts, increase the carburizing temperature, and reduce the time of intermittent treatment. Reduce gas and energy consumption, while preventing the production of carbon black.
    Development of low pressure vacuum carburizing furnace
¡¡ In response to the traditional heat treatment equipment: the problems in the operation of the vacuum carburizing furnace, the Kejia electric furnace boldly reformed the structure of the vacuum furnace and developed a low-pressure vacuum carburizing furnace that meets the customer's process requirements. The KJ series double-chamber carburizing oil quenching gas-cooled vacuum furnace developed by Kejia Electric Furnace can load up to 200kg. The designed double-chamber oil-quenched air-cooled vacuum furnace has been applied for a national invention patent.
The vacuum carburizing furnace designed by Kejia electric furnace mainly includes: double-chamber high-pressure air-cooled vacuum furnace, double-chamber oil-quenched air-cooled vacuum furnace, single-chamber high-pressure air-cooled vacuum furnace (upper and lower alternate air cooling), single-chamber high-pressure air-cooled Vacuum furnace (360°C air cooling). The double-chamber carburizing gas quenching furnace is separated from the transfer chamber by the airtight door of the heating chamber, and the heating chamber is always in a hot state. Therefore, the heating rate of cold workpieces entering the hot chamber is relatively high, thus saving heating time and improving production efficiency.
(1) Single-chamber furnace single-chamber carburizing gas quenching furnace, due to its structural characteristics, the furnace door must be opened every time the material is fed and discharged, so that the entire hot zone is exposed to the atmosphere, because most parts in the hot zone It is a graphite material with a high air absorption rate, so it takes a relatively long time for the working vacuum to be established during the heating and vacuuming process after each loading. In addition, because the vacuum heating is carried out at low temperature, the heat conduction is mainly transferred by convection. Therefore, a single-chamber vacuum furnace must be equipped with a low-temperature convection heating fan and fill the furnace with nitrogen to increase the heating speed in the low temperature section, which not only makes the structure Complexity also increases production costs.
(2) The hot zone of the double-chamber furnace has been kept in a vacuum and high temperature state. When the cold workpiece enters the hot chamber, the furnace temperature basically drops to 750°C. Vacuum heating is performed at this temperature. The heat transfer mainly depends on radiation heat transfer. The double-chamber furnace does not need to install a low-temperature convection heating device to achieve rapid heating.

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