Page 427 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Section 16 7 Deep Drawing 07

l6.7 Deep Drawing

Numerous parts made of sheet metal are cylindrical or box shaped, such as pots and
pans, all types of containers for food and beverages (Fig. 1630), stainless-steel
kitchen sinks, canisters, and automotive fuel tanks. Such parts usually are made by a
process in which a punch forces a flat sheet-metal blank into a die cavity (Fig. 16.31a).
Although the process generally is called deep drawing (because of its capability for
producing deep parts), it also is used to make parts that are shallow or have moderate
depth. It is one of the most important metalworking processes because of its wide-
spread use.
In the basic deep-drawing process, a round sheet-metal blank is placed over a
circular die opening and is held in place with a blankholder, or bold-down ring
(Fig. 16.31b). The punch travels downward and forces the blank into the die cavity,
forming a cup. The important variables in deep drawing are the properties of the
Punch
sheet metal, the ratio of blank diameter, DO; the punch diameter, DP; the clearance, c,

Process Process illustration Result
Zinc: _
OC ~ _
1 BI k_ Cross section
an Ing Die " Blank

K
gtg,
an
2. Deep drawing BI 1 1; Blank-
holder
.......,
Die
Deep-drawn Hold
.....
Punch
3 Ftedrawing Cup ¥ down G
Die
Fiedrawn cup 1 -
ironed cup »-» __
4 Ironin
9 "°"""9 ~~ s,
ring
DIG
5_ Doming Die Q &

Domed can

6. Necking Spififiiiisil if §
as
Support ,iw Roller

4- IT
7_ Seam",
Q Lid 4' Cali
Before After body *fi* §&

FIGURE l6.30 The metal-forming processes involved in manufacturing a two-piece
aluminum beverage can.