What is Metal Shearing and How Does it Work (1)

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What is Metal Shearing and How Does it Work

• Metal fabrication is one of the most important
  processes in the manufacturing industry. For the
  metal to be altered into something useful it
  needs to be fabricated. The first step towards
  metal fabrication is the cutting of the metal.
  There are different methods to cut a metal
  varying from manual to mechanical processes. One
  such popular method of cutting metal is shearing.
  Metal shearing is a process where a sheet of
  metal is separated by applying great shearing
  force to it. In this article, we will discuss how
  the process of metal shearing really works.
• The Shearing Machine
• Basically, the process of shearing produces
  straight line cuts to separate any given piece of
  metal sheet. The machine which facilitates the
  shearing process is called power shear. It can be
  operated manually by labourers or can use
  advanced modes like hydraulic, pneumatic, or
  electric power.
• How it works
• The machine holds the metal sheet in the exact
  position so that it comes between the blades or
  with precise measurements. The upper blade or the
  punch and lower blade (the die) are not placed at
  the same position. Theres a slight difference or
  offset between them called the clearance.
  Normally, the lower blade remains stationary
  while the upper blade is pushed downwards
  forcefully. It is set at such an angle that the
  cut is made from one end to another, instead of
  at once. It reduces the

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amount of force required to cut the metal.
Moreover, the blades dont have a knife sharp
edge they have a square edge and can be of
different kind of metals depending on the
suitability for the given job. Given that the
shearing process is highly dependent on the
blades, you would do well to use highly quality
blades like Amada shear blades or those from
other top manufacturers. The edge of the sheared
metal forms a rough edge after the process as the
blade is forced on the metal. It is because of
the great stress that makes the metal fail and
fracture forming burr edges. The amount of
deformation depends upon the force with which the
blades hit the metal and the clearance area,
which is generally 5-40 of the total thickness
of the metal but it largely depends on the kind
of metal being sheared. The rough edges can be
reduced if a die cushion is placed at the top of
the metal sheet. On the other hand, it might
worsen if there is too much clearance space
between the upper and lower blade.

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