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Vacuum Heat Treatment Furnace

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Precautions For Heat Commissioning And Heating Of Vacuum Heat Treatment Furnace

The characteristics of the vacuum heat treatment furnace with strict vacuum sealing, most heating and insulation material can only be used in the vacuum state, water cooling device, vacuum heat treatment furnace, furnace shell, furnace cover, electric heating element guide don’t treat (water-cooled electrodes), middle vacuum hot insulation parts, all work in a vacuum, heating condition with low voltage high current, high degree of automation.

So what is the thermal commissioning of vacuum heat treatment furnace:

First, vacuum heat treatment furnace vacuum degree is not less than 13.3Pa energized oven, in the furnace temperature slowly rise to 1300℃ in the whole process, the vacuum degree of the furnace should not be less than 13.3Pa, after full baking, degassing, pressure rise rate can meet the technical requirements.

Second, the limit vacuum measurement: not less than 6×1.0-4Pa.Working vacuum measurement: not less than 2.7Pa (at 1000 empty furnace).

Third, pressure rise rate measurement: when the vacuum furnace is heated to 1200℃, after full baking degassing, the furnace temperature is cooled to below 100℃ and then the pressure rise rate is measured, which should reach 0.5Pa/h.

Fourth, recharging gas commissioning: when the vacuum degree of the cooling chamber is 1.33Pa, close the vacuum separator and the vacuum valve of the cooling chamber, and immediately fill the 0.06mpa nitrogen into the cooling chamber furnace, the time should be completed in 2.5 seconds, and the vacuum degree of the heating chamber should not be less than 670Pa.

Matters needing attention when heating:

First, the vacuum heat treatment furnace should avoid heat treatment products when heating, especially enough copper, aluminum, zinc, tin, lead and electric heating elements contact, whether fine powder, molten liquid or steam, to prevent the formation of “pit” erosion on the surface of the electric heating body, the section becomes smaller, and finally overheating and burning off.

Second, the vacuum heat treatment furnace can not be opened for a long time after heating.When the temperature is higher than 400℃, it should not be cooled sharply.For the heating element in high temperature, cold and hot change, easy to cause oxidation peeling.For molybdenum heating furnace, pay attention to the normal use and maintenance should be cooled to 200℃ below the stop of protection gas.

Third, when testing the furnace temperature uniformity, attention should be paid to the positioning and binding mode of the temperature measurement contact, and the distance from the heating element.Box type resistance furnace furnace often (at least monthly) with brush, broom or compressed air, vacuum cleaner cleaning furnace and bricks, to prevent the oxide scale and other impurities in the furnace fell on the heating element, short circuit, and even burned bricks.Bottom plate, crucible, furnace pot and other heat-resistant steel components used for a period of time, it is best to lift and knock, remove its oxide scale.Iron scale and other impurities, if not removed in time, will melt and refractory brick reaction, melting furnace wire.

Fourth, the vacuum heat treatment furnace in the charging, should check whether there are inflammable and explosive and other harmful goods mixed in the charge, if there should be removed in time, it is strictly prohibited to add cold material and wet material directly into the liquid steel, the melting liquid is full of the top is strictly prohibited to add large material, in order to prevent the cover.The active joints of the vacuum heat treatment furnace are all sealed and connected by O-type rubber rings, which are cooled by water.