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| USING FORM BOXES
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 Form
boxes are needed when you want to form deeper shapes than
is possible with the matrix
die method described on page 33 of
Susan's book.
Typically, the maximum depth that is readily obtainable
with an uncontained matrix die is 1/2" to 3/4". This is
because the urethane pad is able to extrude sideways,
out from under the matrix die and the pressure generated
by the press is being wasted. With a form box, the pads
cannot go sideways, and all of the force is directed into
the metal. Also, by using a full containment envelope,
it is possible to use a much softer durometer pad than
is possible on the open platen. In fact, if the 60 durometer
pads used in this method were used on the open platen,
they would just "squirt" sideways and do no forming at
all. |
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