Group Members
 M Jahanzaib Naqvi
 M Lateef Khan
 M Ali Naqi
 Talha Farhad
Press Working :
 Press working may be defined as, a manufacturing process by which various components are
made from sheet...
Types of press work operation
 The sheet metal operations done a press may be
grouped into two categories.
 1: Cutting o...
Cutting operations
 In cutting operations the work piece is stressed by its
ultimate strength. The stresses caused in the...
Blanking
Blanking is the
operation of cutting a
flat shape from sheet
metal. The product
punched out is called
the “blank”...
Punching or
Piercing
It is a cutting operation
by which various shaped
holes are made in sheet
metal. Punching is similar
...
Notching
This is cutting
operation by
which metal
pieces are cut
from the edge
of the sheet ,
strip or blank.
Perforating
This is a process
by which
multiple holes
are very small
and close
together are
cut in a flat
sheet metal.
Trimming
This operation
consists of cutting
unwanted excess
of material from
the periphery of
a previously
formed
componen...
Shaving
The edge of a
blanked part are
generally rough,
uneven and un
square. Accurate
dimensions of the
part are obtained...
Lancing
This is a cutting
operation in which a
hole is partially cut
and then one side is
bent down to form a
sort of tab....
Nibbling
The nibbling operation , which
is used for only small quantities
of components, is designed
for cutting out flat ...
Forming Operations:
 In forming operations , the stresses are below the ultimate strength of the
metal , in this operatio...
1: Bending:
In this operation; the
material in the form of
flat sheet or strip is
uniformly strained
around a linear axis
...
The equation for estimating the maximum bending
force is,
where k is a factor taking into account
several parameters inclu...
2: Drawing:
This is a process
of forming a flat
work piece into a
hollow shape by
means of a
punch which
cause the blank
i...
3: Squeezing:
Under the
operation, the
metal is caused
to flow to all
portions of a die
cavity under the
action of
compres...
Curling
The forming of
an edge having
a circular cross
section along a
sheet or around
the end of a
shell or tube.
Embossing
A process for
producing
raised or
sunken designs
in sheet metal
by means of a
male and
female die.
Extrusion
A process in which
pressure is applied
to a slug of metal
causing the metal
to flow either up
around the punch
(...
Ironing
A process in
which the wall
thickness of the
shell is reduced
without
changing the
O.D. of the shell.
Necking
Reducing the
diameter of a
portion of the
length of a
cylindrical shell
or tube.
Coining
A squeezing
operation, usually
performed in a
closed die in which
the metal is forced
to flow and fill the
shape a...
Any Question
Press work operations(Metal Sheet Operations)
Press work operations(Metal Sheet Operations)
Press work operations(Metal Sheet Operations)
Press work operations(Metal Sheet Operations)
Press work operations(Metal Sheet Operations)
of 29

Press work operations(Metal Sheet Operations)

It will give you almost all operations which relates to metal cutting and metal sheet forming operations.
Published on: Mar 4, 2016
Published in: Engineering      
Source: www.slideshare.net


Transcripts - Press work operations(Metal Sheet Operations)

  • 1. Group Members  M Jahanzaib Naqvi  M Lateef Khan  M Ali Naqi  Talha Farhad
  • 2. Press Working :  Press working may be defined as, a manufacturing process by which various components are made from sheet metal. This process is also termed as cold stamping. The machine used for press working is called a press.  The main features of a press are:  · A frame which support a ram or a slide and a bed, a source of mechanism for operating the ram in line with and normal to the bed.  · The ram is equipped with suitable punch/punches and a die block is attached to the bed.  · A stamping is produced by the downward stroke of the ram when the punch moves towards and into the die block.  · The punch and die block assembly is generally termed as a “die set” or simple as the “die”
  • 3. Types of press work operation  The sheet metal operations done a press may be grouped into two categories.  1: Cutting operations  2: Forming operations
  • 4. Cutting operations  In cutting operations the work piece is stressed by its ultimate strength. The stresses caused in the metal the applied forces will be shear stresses.
  • 5. Blanking Blanking is the operation of cutting a flat shape from sheet metal. The product punched out is called the “blank” and the required product of the operation the hole and the metal left behind is discarded as waste.
  • 6. Punching or Piercing It is a cutting operation by which various shaped holes are made in sheet metal. Punching is similar to blanking except that in punching, the hole is the desired product. The material punched out from the hole being waste.
  • 7. Notching This is cutting operation by which metal pieces are cut from the edge of the sheet , strip or blank.
  • 8. Perforating This is a process by which multiple holes are very small and close together are cut in a flat sheet metal.
  • 9. Trimming This operation consists of cutting unwanted excess of material from the periphery of a previously formed component.
  • 10. Shaving The edge of a blanked part are generally rough, uneven and un square. Accurate dimensions of the part are obtained by removing a thin strip of metal along the edges.
  • 11. Lancing This is a cutting operation in which a hole is partially cut and then one side is bent down to form a sort of tab. Since no metal is actually removed and there will be no scrap.
  • 12. Nibbling The nibbling operation , which is used for only small quantities of components, is designed for cutting out flat parts from sheet metal. The flat parts from simple to complex contours. This operation is generally substituted for blanking. The part is usually moved and guided by hand as the continuously operating punch cutting away at the edge of the desired contour.
  • 13. Forming Operations:  In forming operations , the stresses are below the ultimate strength of the metal , in this operation , there is no cutting of the metal but only the contour of the work piece is changed to get the desired product.
  • 14. 1: Bending: In this operation; the material in the form of flat sheet or strip is uniformly strained around a linear axis which lies in the neutral plane and perpendicular it’s the length wise direction of the sheet or metal.
  • 15. The equation for estimating the maximum bending force is, where k is a factor taking into account several parameters including friction. T is the ultimate tensile strength of the metal. L and t are the length and thickness of the sheet metal, respectively. The variable W is the open width of a V-die or wiping die.
  • 16. 2: Drawing: This is a process of forming a flat work piece into a hollow shape by means of a punch which cause the blank into a die cavity.
  • 17. 3: Squeezing: Under the operation, the metal is caused to flow to all portions of a die cavity under the action of compressive forces.
  • 18. Curling The forming of an edge having a circular cross section along a sheet or around the end of a shell or tube.
  • 19. Embossing A process for producing raised or sunken designs in sheet metal by means of a male and female die.
  • 20. Extrusion A process in which pressure is applied to a slug of metal causing the metal to flow either up around the punch (toothpaste tubes) or down in the direction of pressure
  • 21. Ironing A process in which the wall thickness of the shell is reduced without changing the O.D. of the shell.
  • 22. Necking Reducing the diameter of a portion of the length of a cylindrical shell or tube.
  • 23. Coining A squeezing operation, usually performed in a closed die in which the metal is forced to flow and fill the shape and profile of the die. There is a definite change in metal thickness.
  • 24. Any Question

Related Documents