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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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