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What is a Vacuum furnace? What is the purpose of Vacuum furnace?

What is a Vacuum furnace?
Vacuum furnace means that in the specific space of the furnace cavity, the vacuum system (composed of vacuum pump, vacuum measuring device, vacuum valve and other components through careful assembly) is used to discharge some substances in the furnace cavity, so that the pressure in the furnace cavity is less than a standard atmospheric pressure. The space in the furnace cavity thus realizes the vacuum state, which is called Vacuum furnace.

1600℃ Vacuum Fiber Furnace
1600℃ Vacuum Fiber Furnace

Vacuum furnace is mainly divided into:vacuum sintering furnace,vacuum brazing furnace,vacuum fiber furnace,vacuum graphite furnace,vacuum Heat shield furnace and vacuum hot pressing furnace.

The Vacuum furnace is generally composed of the host, furnace, electric heating device, sealed furnace shell, vacuum system, power supply system, temperature control system and transport vehicle outside the furnace. The sealed furnace shell is welded with carbon steel or stainless steel, and the joint surface of detachable components is sealed with vacuum sealing material. To prevent deformation of the furnace shell and deterioration of the sealing material after heating, the furnace shell is generally cooled by water or air cooling. The furnace is located inside a sealed furnace shell. According to the purpose of the furnace, different types of heating elements are installed inside the furnace, such as resistors, induction coils, electrodes, and electron guns. The Vacuum furnace for metal smelting is equipped with crucibles, and some are also equipped with automatic pouring devices and manipulator for loading and unloading. The vacuum system mainly consists of a vacuum pump, vacuum valve, and vacuum gauge.

High temperature graphite vacuum sintering furnace
High temperature graphite vacuum sintering furnace

Advantages of Vacuum furnace:
1.Completely eliminating the oxidation and decarburization of the workpiece surface during the heating process, a clean surface without deterioration layer can be obtained. This is of great importance to the improvement of the cutting performance of those tools that only grind one side (such as Fried Dough Twists drills that expose the decarburized layer on the groove surface directly to the edge after grinding).
2.It has no pollution to the environment and does not require the treatment of three wastes.
3.The accuracy of furnace temperature measurement and monitoring has significantly improved. The indicated value of the thermocouple and the furnace temperature reach ± 1.5 ° C. However, the temperature difference between different parts of a large number of workpieces in the furnace is relatively large, and if thin gas forced circulation is used, the temperature difference can still be controlled within the range of ± 5 ° C.
4.High degree of mechatronics integration. On the basis of improving the accuracy of temperature measurement and control, workpiece movement, air pressure regulation, power regulation, etc. can be pre programmed and set, and quenching and tempering can be carried out step by step.
6.The energy consumption is significantly lower than that of salt bath furnaces. The modern advanced Vacuum furnace heating room adopts the thermal insulation wall and barrier made of high-quality thermal insulation materials, which can highly concentrate the electric heating energy in the heating room, with remarkable energy-saving effect.