To produce
different materials made of precision sheet metal, it is needed to give it
different shapes. For giving different shapes to a precision sheet metal it has
to be bent. Without bending it is impossible to produce any materials. Sheet metal,
a thin and flat sheet, has enormous uses in various industries both as
construction and raw material. The process of making sheet metal useable in
different industries is known as sheet metal engineering. Forming, cutting and
finishing are the three primary steps of sheet metal engineering. Every sheet
metal has to go through these three processes and after these they are ready to
use in the required industries.
Bending is a
manufacturing process by which a sheet metal can be deformed to fitting bezel
on watch and change its shape. The metal is stressed above its own
yield strength but just below its highest tensile strength. In bending, refers
to the deformation about one axis only, there is little change to the material
surface area.
Sheet
Metal Bending Dies is secured between clamps and stretched over a block form in the
stretch forming process. In bending sheet metal is bent not only along a
straight line, but also along a curved path. In depth drawing process the depth
of the part being made is more than half its diameter. The process of creating
raised and smooth designs, by means of matched female and male roller dies or
by passing a strip of metal between rolls of the sought after pattern, on sheet
metal is known as embossing. Bulging process is used to create different shells
like pyramidal shells, shells of pyramid frustums, shallow pans and embossed
panels. In roll forming a sheet of metal is passed through continuous sets of
stands or rolls to get the sought after cross-section profile. A tube or disk
of metal is spun at a very high speed and formed into a symmetrical part in the
spinning process.
Different shapes can be produced in bending by using standard die sets or bend
brakes. By using die sets materials are given v-shape and by using press brakes
a number of shapes can be given to the materials. In this process a backing pad
is used to force the contacting with the punch bottom and this process is
performed when two parallel bending axis are produced in the same operation.
In this process
the sheet metal is bent on one edge to 900. By the stroke position of the punch
the flange length can be easily changed and the bend angel can be easily
controlled. It is also known as flanging. When two acting operations are done
on the work piece one after another then it is called double die bending. It
can reduce spring back by enhancing strain hardening.
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