Embossing Coining Spinning Stretch Forming Nibbling

1. Sheet Metal
Operations

2. Intro.
 Sheet Metal Operations are cold-
working operations that manufacture
low-cost parts with very high volumes
and at a fast rate.
 A piece of metal whose thickness is
between 0.006(0.15 mm) and 0.25
inches(6.35 mm) – Sheet Metal.

3.  Sheet metal can be cut, bent and
stretched into nearly any shape.
 Anything thinner is referred to as a foil
and thicker is considered as a plate.
 Sheet thickness is generally measured
in gauge. Greater the gauge number,
thinner the sheet of metal.

4. Sheet Metal Operations
Operations will be Covered:-
 Embossing
 Coining
 Spinning
 Stretch Forming
 Nibbling

5. Embossing
 It is a process for producing
raised or sunken designs or
relief in sheet metal.
 The metal sheet embossing
operation is commonly
accomplished with a
combination of heat and
pressure on the sheet metal,
depending on what type of
embossing is required.

6. Process

7. Characteristics
 Use in medium to high production
runs.
 The ability to maintain the same
metal thickness before and after
embossing.
 The ability to produce unlimited
patterns, depending on the roll dies.
 The ability to reproduce product
with no variation.

8. Coining
 Similar to embossing with
the difference that similar
or different impressions are
obtained on both the sides
of the sheet metal.
 It is a cold working sizing
operation. It is used for
production of metal coins.

9. Spinning
 Metal spinning is a
cold working
process in which an
axially symmetric
part is gradually
shaped over a
rotating mandrel
using a rounded
tool or roller.

10. Classification of metal spinning
techniques
MetalSpinning Manual (Conventional)
Spinning
Shear Spinning
Tube Spinning

12. Stretch Forming
 Stretch forming is a metal forming process in
which a piece of sheet metal is stretched and
bent simultaneously over a die in order to form
large bent parts.

13. The basic principle of this technology is to
stretch the metal beyond its yield point in
order to reach the plastic area so that the
elongation is permanent.
This principle can be applied to metal sheets
and profiles and in various directions
depending on the final part shape.

14. Nibbling
Punching a series of small overlapping slits or
holes along a path to cut-out a larger
contoured shape.

16. References
A STUDY ON DEEP DRAWING AND
SPINNING PROCESS IN SHEET METAL
FORMING by Dr. R. Uday Kumar.
 Google images
www.thelibraryofmanufacturing.com

17. Thank You