Shaft and chamber furnaces
Shaft furnace - chamber-type resistance electric furnace with a sealed chamber and a removable cover and vertical loading. Chamber electric furnace - electric resistance furnace with a sealed chamber and a hinged or sliding cover and horizontal loading.
A structural feature of this type of furnace is the stationary position of the chamber and heaters in conjunction with a movable cover or door. The volume of the working zone of the produced furnaces of this type exceeds 150 m3, and the degree of vacuum maintained reaches 6.5 • 10-2 Pa. It is also possible high-vacuum pumping inlet controlled atmosphere.
This type of furnace provides ease of use and the ability to process parts of particularly large dimensions. At the same time, the furnaces have optimal maintainability. This type of furnace is suitable for multi-zone execution, which helps to minimize the temperature gradient inside the chamber. The use of modern heat-insulating materials minimizes heat loss and, as a consequence, reduces powerconsumption.
Heating elements can be of almost any shape from any high-temperature resistance alloy (nichrome, eurofechral, kanthal A1), molybdenum and tungsten alloys. The structure of the heater is usually collapsible, which allows you to replace the part of the heater that requires replacement during maintenance, without affecting the rest of the elements.
The main advantages of shaft and chamber furnaces:
Scope: annealing, tempering, normalization of large-sized products and structures made of stainless and stainless steels, gas quenching, cementation, nitriding, etc.
|
Parameter name |
Value |
|
Type of chambers: |
1 |
|
Formof the chamber |
cylindrical or rectangular |
|
Inner dimensions of chamber: - min, mm: - max, mm: |
120...200 24000 and more |
|
Operating temperature range in the heating chamber, оС: |
100...1250 100...1600 600...2150 |
|
Heating type |
resistive |
|
Permissible mass with parts, kg: |
1...25000 |
|
Available oxygen removal methods: |
forevacuum pumping |
|
Range of heating / cooling speeds, ° C / min: |
1…20 |
|
Working gases: |
nitrogen, argon, methane, ammonia, formgas, other gases as agreed |
|
Number of inputs for working gases: |
1...12 |
|
Available operations with working gases: |
mixing, moisturizing |
|
Minimum percentage of each gas when mixed: |
5% |
|
Range of automatic adjustment of the flow rate of each gas, l / min: |
30...12000 and more |
|
Ability to use as a vacuum or gas vacuum furnace: |
yes |
|
Ability to use as a convection chamber: |
yes |
|
Types of pumping systems: |
oil (rotary vane + diffusion pumps), oil-free (dry scroll + turbomolecular pumps) |
|
The uniformity of temperature in the working space without loading the electric furnace with automatic control of maintaining the temperature in the steady state, ° C, is not worse: |
±7±0,005t |
|
Stability of maintaining the operating temperature in the working area when controlling heating in automatic mode, ° C, not worse: |
±5±0,0015t |
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