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Vacuum furnace, that is, in the furnace cavity of this specific space using a vacuum system (by the vacuum pump, vacuum measurement devices, vacuum valves and other components carefully assembled) will be part of the furnace cavity material discharge, so that the pressure in the furnace cavity is less than a standard atmospheric pressure, the furnace cavity space so as to realize the vacuum state.
Equipment for heating in a vacuum environment, piped to a high vacuum pumping system in a furnace chamber sealed by a metal casing or quartz glass cover.
Furnace chamber vacuum up to 133 × (10-2 ~ 10-4) Pa.
Furnace heating system can be directly with resistance furnace wire (such as tungsten wire) energized heating, can also be used for high-frequency induction heating.
The maximum temperature can reach about 3000℃.
It is mainly used for ceramic firing, vacuum smelting, degassing and annealing of electric vacuum parts, brazing of metal parts, and ceramic-metal sealing.
Advantages:
1. Completely eliminates the oxidation and decarburization of the surface of the workpiece during the heating process, and a clean surface with no deterioration layer can be obtained. This for those in the sharpening only grinding one side of the tool (such as twist drill grinding so that the decarburization layer of the groove surface is directly exposed to the edge) the cutting performance of the improvement of the relationship is great.
2. No pollution to the environment, no need for three-waste treatment.
3. Furnace temperature measurement and monitoring accuracy is significantly improved. Thermocouple indication value and furnace temperature temperature to ± 1.5 ° c. But the temperature difference between different parts of a large number of workpieces in the furnace is large, if the use of dilute gas forced circulation, can still be controlled in the range of ± 5 ° c temperature difference.
4. High degree of mechanical and electrical integration. In the temperature measurement and control accuracy on the basis of improving the workpiece movement, air pressure adjustment, power regulation can be pre-programmed settings, according to the steps of the implementation of quenching and tempering.
5. Consumption is significantly lower than the salt bath furnace. Modern advanced vacuum furnace heating chamber using high-quality thermal insulation materials made of heat-insulating walls and barriers, can be highly concentrated in the heating chamber of electric energy, energy-saving effect is remarkable.
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