Deep drawing is a metal forming process where a flat sheet is formed into a hollow shape using a punch and die. The sheet is placed over the die opening and held in place by a blank holder. The punch then forces the sheet into the die cavity, forming it into the desired shape. Deep drawing can produce complex 3D shapes from sheet metal and offers advantages like high production rates and consistency. However, defects may occur like tearing, wrinkling, thinning, or earing if the process is not controlled properly.

2. DEEP DRAWING
Presented by:
Maria Iqbal
MME-13-26
(2013-2017)
Institute of Advanced Materials, BZU, Multan

3. Deep Drawing
Process definition:
 A forming process which occurs under a combination of
tensile and compressive conditions
 A flat sheet metal blank is formed into a hollow body open
on one side or a hollow body is formed into a hollow body
with a smaller cross-section
 Deep drawing processes are divided into three types:
 Deep drawing with tools
 Deep drawing with active means
 Deep drawing with active energy

4. Process
 Deep drawing of sheet metal is performed with a punch and
die
 The punch is the desired shape of the base of the part, once
drawn
 Blank is placed over the die opening. A blank holder, that
surrounds the punch, applies pressure to the entire surface
of the blank, (except the area under the punch), holding the
sheet metal work flat against the die
 The punch travels towards the blank. After contacting the
work, the punch forces the sheet metal into the die cavity,
forming its shape

5. Deep Drawing of Sheet
Metal

6. Deep Drawing
Blanking
Deep Drawing
Redrawing
Ironing
Doming
Necking
Seaming
Relatively complex 3
dimensional shapes can be
made out of sheet metal!

8. Drawing Ratio
 Measurement of the amount of drawing performed on a
sheet metal blank can be quantified with the drawing
ratio
 Higher the drawing ratio, the more extreme the amount
of deep drawing
 The drawing ratio is roughly calculated as,
DR = Db/Dp
Db- diameter of the blank
Dp- diameter of the punch

9. Advantages
 Materials- A wide variety of ferrous and nonferrous
materials can be used
 Rapid Press Times- Deep draw transfer presses have a
rapid press time and can produce large quantities of metal
components in a short space of time
 Product Consistency- capable of high repeatability
which ensures batch to batch consistency in the production
 Complex Designs
 Reduces Material Waste
 Cost efficient process

10. Defects In Deep Drawing
 Tearing- Maximum thinning of the cup wall occurs
near the base, so, tearing of the sheet metal is most
likely to occur in this region even if the stress is
originating somewhere else
 Wrinkling may often occur if the blankholder force is too
low
 Excessive thinning in areas of the sheet metal
 Earing that is the formation of wavy edges at the open
end of the drawn cup
 Surface scratches or irregularities may appear
on drawn part

11. Examples
of Deep
Drawing