Sheet Metal Stamping Dies
Stamping dies are used to produce the high volume production by
stamping process. The die will have the ability to provide
appropriate stamping force to perform the required operation. In
the die there will be two parts, upper half and the lower half.
These part can also be referred as male part and female part. Male
or female parts can take either the upper position or the lower
Construction of dies
In a tool, the punches of respective operations like
blanking and punching is at the ram or at the bed of the plate. The
ram will be bolted with the bed of the machine.
The different types of dies are given below. The difference
between them is important to understand.
Dies which can perform only one operation in one stroke by press
are known as simple dies. This operation can be either cutting
operation or forming operation.
These dies are also able to perform more than one operation at
one machine station. Since compound die can perform only cutting
operation, this die can perform bending or drawing operation along
with cutting operations. Because of these properties in the die it
is called combination die. For example, to produce a cup shaped
component the combination die can be used for blanking punching and
Compound dies are those in which more than one operations can be
performed by one stroke of press at a single station. Basically
these types of dies are cutting tools. In such dies only cutting
operations can be performed. For example a washer can be pressed
out by performing blanking and piercing operation at the same
station. These types of dies are very accurate than dies of single
operation. Mass production by these dies is more economical than
single operation die.
Progressive Dies or follow Dies
Die which can perform series of operations is called progressive
or follow die. The operation is performed at each station on a work
piece during a stroke of press. The work piece is transferred to
the next station between the strokes. In every stroke a finished
work is completed. For example, if piercing is done on a part in
one stroke, the blanking punch tool cut a blank in the metal in
which the previous hole is pierced at previous station. That is why
after the first stroke, when the holes will be punched, the
finished product will be produced by each stroke of press.
In the transfer dies, the metal work piece is not fed
progressively from one to another work station, as in the
progressive dies. But in these type of dies the already blanked out
work-piece is fed mechanically from one station to another
Multiple Dies Or Gang Dies
Multiple dies are those which has the ability to produce more
than one work pieces in a single stoke of the press. This is also
called Gang Dies. In this die the number of simple dies and
punches are combined or ganged together so that it can produce more
than one parts at each stroke of the press.
In other dies, the punching tool is held in the punch holder
plate which is fastened to the ram. On the other side, the die is
fitted with die holder which is fastened at the bed of press. In
the inverted dies there is a difference. The places of punch and
die are interchanged. In this the punch if fastened at the bed of
press and die is attached with the ram.
Difference between progressive die, combination die and
Compound die performs one or more operation simultaneously while
progressive die performs series of operations and combination die
performs two or more operations at one station. Compound die only
performs cutting operations and combination dies can perform other
operations like bending, drawing etc.