3 Fundamentals of press design

Methods of forming and cutting technology
workpiece
punch
sinkingdie
Deep drawing is a method of forming under compressive and tensile
conditions whereby a sheet metal blank is transformed into a hollow
cup, or a hollow cup is transformed into a similar part of smaller dimensions
without any intention of altering the sheet thickness (cf.Sect. 4.2.1).
Using the single-draw deep drawing technique it is possible to produce
a drawn part from a blank with a single working stroke of the press
(Fig. 2.1.10).
In case of large deformations, the forming process is performed by
means of redrawing, generally using a number of drawing operations.
This can be performed in the same direction by means of a telescopic
punch (Fig. 2.1.11) or by means of reverse drawing, which involves the
second punch acting in opposite direction to the punch motion of the
previous deep-drawing operation (Fig. 2.1.12).
punch
blank holder
blank
drawn part
die
Fig. 2.1.10 Single-draw deep drawing with blank holder
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
Fig. 2.1.9 Can ironing
11