Keywords: Vacuum, Vacuum Tempering Furnace, Vacuum Furnace, Tempering Furnace, Temperature Uniformity, Temperature, Hot Air Circulation, Tempering, Heat Treatment, Electric Furnace, Industrial Furnace, Resistance Furnace,

Vacuum Tempering Furnace

Vertical Vacuum Tempering Furnace

Vacuum tempering furnace composition

    Tempering guard for 1 zone heating. The top hanging charge, the opening of the furnace cover motor and groove-shaped guide wheel composed of the lid mechanism to perform.

    Tempering furnace furnace is equipped with a circulating air duct, by the gas stirring system for the charging of nitrogen gas forced circulation, in order to ensure the uniformity of the furnace temperature.

    Vacuum system of the vacuum unit.

Vacuum tempering furnace uniformity of the solution

　　Tempering furnace Shanghai temperature uniformity requirements for the 650 ¡æ 5 ¡æ (inflated 4.5Pa stirring cycle). The beginning of the temperature measurement can only be 645.℃, less than the design requirements.

　　After analyzing that the air volume wind pressure is insufficient, so change the fan pulley speed ratio, in order to improve the wind speed; later and take measures to improve the sealing of the insulation layer; in the ventilation channel corners to add a transition plate. In addition, the outside of the deflector tube increased a layer of metal brittle heat screen.

　　As a result of the above measures, finally make the Shanghai temperature uniformity of 650.8 ℃ to meet the design requirements.

　　Overview of the above measures, there is a noteworthy problem is: although the vacuum furnace at low temperatures, to inflatable stirring, forced circulation, convection heat transfer is the main, but the heater is not to be ignored direct radiation heat transfer. For example, the furnace heater is not full of effective working area of the full length, but biased towards the bottom of the furnace so the beginning of the temperature measurement, the effective working area near the middle of the heater temperature is high, and away from the heater is far from the upper part of the temperature is low, resulting in tempering furnace furnace temperature uniformity does not meet the design requirements. For this reason, we have added a layer of metal insulation screen outside the guide tube to reduce the heater's direct radiation, improve the temperature distribution. Practice has proved that this measure is very effective. For example, after increasing the wind speed, the temperature difference is not significantly improved, only the upper part of the temperature zone slightly improved, after taking this measure, the furnace temperature uniformity in one fell swoop debugging success. Emphasize this point, and does not exclude the role of other measures.

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