Construction of vacuum annealing furnace
Vacuum annealing furnace is a kind of vacuum furnace in which vacuum system is assembled by vacuum pump, vacuum measuring device, vacuum valve and other components, and some substances in the chamber are discharged, so that the pressure in the chamber is less than a standard atmospheric pressure, and the space in the chamber can realize the vacuum state.
The vacuum furnace is generally composed of a main engine, a furnace, an electrothermal device, a sealed furnace shell, a vacuum system, a power supply system, a temperature control system and an outside conveyor. The sealed shell is welded with carbon steel or stainless steel, and the joint surface of the detachable part is sealed by vacuum sealing material. In order to prevent the deformation of the shell after heating and the deterioration of the sealing material, the furnace shell is usually cooled by water cooling or air cooling. The furnace is located in the sealed furnace shell. According to the use of the furnace, the furnace is equipped with different types of heating elements, such as resistance, induction coil, electrode and electron gun. The vacuum furnace for smelting metals is equipped with a crucible, and some are equipped with automatic pouring devices and manipulators for loading and unloading materials. The vacuum system is mainly composed of vacuum pump, vacuum valve and vacuum gauge.
Advantages of vacuum furnace
1. Completely eliminate the oxidation and decarbonization of the workpiece surface in the heating process, and obtain a clean surface without deteriorating layer. This is very important for those tools that grind only one side of the groove surface (such as twist drill grinding so that the decarbonized layer of the groove surface is directly exposed to the edge, cutting performance improvement.
2, no pollution to the environment, no need for three wastes disposal.
3. The accuracy of furnace temperature measurement and monitoring is obviously improved. The indication value of the thermocouple reaches 1.5 degrees C. However, the temperature difference between different parts of a large number of workpieces in the furnace is large. If the forced circulation of thin gas is adopted, the temperature difference can still be controlled within the range of (?) 5 (?) c).
4, high degree of mechanical and electrical integration. On the basis of improving the precision of temperature measurement and control, workpiece movement, air pressure regulation, power regulation can be programmed and set in advance, and quenching and tempering can be carried out step by step.
5, energy consumption is significantly lower than salt bath furnace. Modern advanced vacuum furnace heating chamber uses high-quality insulation material made of insulation wall and barrier, can be highly concentrated in the heating chamber, energy-saving effect is remarkable.
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