Title: Manufacturing of Draft Fans
1Manufacturing of Draft Fans
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2- The manufacturing of any system involves a series
of mechanical process. Each part is manufactured
using a different mechanical process such as
casting, machining, drawing, joining etc. After
the parts are manufactured, they must be sent for
various hardening process annealing, carbonizing
etc. depending on the material used. - Various mechanical processes involved
- Casting
- In this process the new part is formed from the
melting of the metal, and then it is subjected to
flow into the mold cavity where it takes the
required shape and is allowed to solidify. - Parts such as vanes, casing and shafts in the
draft fans are manufactured by this process. - The metal formed in this process is usually of
the uniform characteristics. - The metal grains are uniformly distributed in the
metal.
3- Machining
- In this type the already existed part of a system
or a part that is taken from the casting process
is used in order to make a new part. - Machining process uses various machine tools such
as lathe, planer, shaper, milling machine etc.
and they require electric power. - The ends and corners of the draft system are to
be chambered in order to prevent any cuts to the
human. - Some parts of the system such as vanes of the fan
are machined in order to maintain or remove the
excess material on the vanes. - Joining
- This process is of two types permanent joining or
temporary joining. - Temporary joining involves nuts and bolt fitting
whereas permanent joining includes riveted
joints, weld joints etc. - In draft system bolt and nut joints are seen in
removable or frequent replaceable parts. For
foundation support of the system, we use eye
bolt. - Welds are used for permanent joining. Parts which
are broken or very big in size are welded
together to get a single unit.
4- Riveted joints serve the same purpose as the
welded joints. But in riveted joints a piece of
the metal is used which combines the two distant
pieces in a single shape by the application of
pressure. This is done with casing when it comes
in two different parts. - Metal hardening process
- There are many metal hardening processes such as
annealing, carbonizing etc. The final outputs of
the casting process may not have good strength so
these processes will provide the necessary
hardening support to the parts. - We use different hardening processes with
different metals. - Parts of the draft system which are made of
steels under go annealing process. - The parts such as casing are made of steel which
are to be annealed - The manufacturing process of the parts is
important because the use of an accurate process
will make it easy for understanding which type of
repair is appropriate for the given part of the
system.
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