Heat Treating Furnaces
We divide Heat Treating Furnaces into two major classes,
Atmosphere and Vacuum
Atmosphere Furnaces operate
with air or a protective atmosphere around the material being heat
treated. Vacuum Furnaces remove most of the atmosphere surrounding
the work and the parts are processed in an absence of atmosphere.
Atmosphere furnaces are in the following types:
Batch furnaces run in individual batches, and do not have a continuous
flow of material into the furnace.
Box furnaces are probably the most common type of furnace. They
can be heated with gas or electric and are used both with and without
special atmosphere. Many different types of processes are carried
out in box furnaces. Box furnaces are also popular laboratory furnaces
due largely to their flexibility.
Bell furnaces are used where the heating and cooling steps can be
separated. It is common to have one “heating bell” with
multiple bases. The materials are loaded on the base, the heating
bell placed over the load and the heating cycle take place. On completion
the heating bell can move to another base that was loaded during
the heat up of the first. Annealing of wire and strip coils are
typical of materials processed in a bell furnace. If a special atmosphere
is required then an internal gas tight retort is provided. Thus
after the heating bell is removed, the product is still protected
by the atmosphere.
Continuous Furnaces have a feeding means where the material being
processed in continually being feed into the furnace.
Mesh Belt furnaces have a continuous alloy belt
running through the furnace and then returned either inside the
furnace or generally running outside the furnaces. These types of
furnaces are very often used for lighter loads that require an air
or atmosphere cooling after heating.
Cast Link furnaces have a continuous belt made
up of cast links that are pinned together like hinges. Cast link
furnaces can support much higher loads than Mesh Belt Furnaces.
Vacuum Furnaces operate
with the atmosphere (air) removed. In some cases the chamber may
be backfilled with gasses such as Nitrogen or Argon during different
portions of the heating / cooling cycle.
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