3. If the depth of the item created is equal to
or greater than its radius, then the metal
forming process called deep drawing.
4. Many parts made of sheet metal are
cylindrical or box -shaped :for example,
pots and pans,containetrs for food and
kitchen sinks ,an automotive fuel tanks.
Such parts are usually made by a process
in which a punch forces on a flat sheet
metal blanks into a die cavity. The
process is generally called deep drawing.
5.
6.
7.
8.
9.
10. Different metals
are used in deep 6:Iron
drawing in which
some metals are
these
1:Alloy
2:Aluminum
3:Brass
4:Cold rolled steel
5:Copper
11. In the basic method
,a round sheet metal
blank is placed over
a circular die opening
and is held in place
with a blankholder,or
hold-down ring. The
punch travels
downward and forces
the blank into the die
cavity, forming a cup.
12.
13.
14.
15.
16.
17.
18.
19. To control the flow of the blank into the die cavity.
Beads restrict the flow of the sheet metal by bending and unbending
in during drawing.
Draw bead diameters may rang from 13 mm to 20 mm (0.5 in to
0.75 in).
20.
21.
22.
23. In deep drawing ,lubrication lowers
forces, increases drawability,and reduces
defects in the parts. In general lubrication
of the punch should be held because
friction between the punch and the cup
improves draw-ability .
Commonly used lubricants are mineral
oils, soap solutions, and wax.
24. Deep drawing is especially beneficial when
producing high volumes, since unit cost decreases
considerably as unit count increases:
Once the tooling and dice have been created, the
process can continue with very little downtime or
upkeep. Tool construction costs are lower in
comparison to similar manufacturing processes, such
as progressive die stamping, even in smaller volumes;
in these situations deep drawing may also prove the
most cost-effective manufacturing solution.
When considering the functionality of the end product,
deep drawing poses still more advantages.
Specifically, the technique is ideal for products that
require significant strength and minimal weight.
25. Deep drawing may
be a viable production
solution for any Complex axis-
manufacturing process symmetric
that requires one or
more of the following . geometries: deep
drawing delivers
exceptional detailing
Rapid cycle and accuracy
times: large
quantities of products
are easily
manufactured through
deep drawing
26. Deep drawing is a sheet metal forming
process used to fabricate cup-shaped
parts; bar drawing is a bulk deformation
process used to reduce the diameter of a
cylindrical work part. The basic drawing
process for a bar
27. Deep drawing is a metal forming process in which
sheet metal is stretched into the desired part shape.
A tool pushes downward on the sheet metal, forcing
it into a die cavity in the shape of the desired part.
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
contoured parts. Stretch forming is performed on a
stretch press, in which a piece of sheet metal is
securely gripped along its edges by gripping jaws.
