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Crowning Video |
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Press brakes (and folding machines) suffer
from a difficulty that has existed from
their very beginnings and that is inherent
to their construction: the phenomenon that
the machine frames deflect somewhat during
the bending process. If no correction is
made for this deflection, the top tool
does not penetrate the same depth into the
bottom tool all over the working lenght.
As a result, the bending angle is not
constant over the entire product length.
In the course of time, various solutions
have been developed to compensate for this
deviation.
One of the oldest solutions is ãshimmingä
or ãcrowningä the bottom tool. The most
readily available items were used for this
purpose, varying from strips of paper and
metal to brass strips. Experienced
operators achieved some results in this
manner, but it was a time-consuming task
that had to be repeated for each product.
As an alternative to the corrections made
with paper, metal and brass strips, simple
mechanical crowning systems were soon
introduced. Using numerous adjustment
screws and their corresponding wedges, one
by one the top or bottom tool was raised.
This too, however, required much time and
skill if acceptable results were to be
achieved. This is why this solution is
used considerably less these days.
In the late 1970s, a breakthrough was
achieved when Wila developed its
centrally-adjustable crowning system type
CVB. Based on this initial design, in
later years the improved versions, types
CVB/D and NSCR I, were introduced. Today,
NSCR II represents the most advanced
solution in the area of crowning.
New Standard Crowning II (NSCR II) was
specially developed by Wila within the
framework of its Universal Press Brake
Concept, as a supplement to and
improvement on the existing
New Standard Crowing I (NSCR I). At the
same time, as part of the Universal Press
Brake Concept, a crowning system was
developed for situations with American
Style clamping and tool systems. In cases
in which European Style clamping and tool
systems have been opted for, a special
clamping table (OB/Eur-1) can be used,
which is actually a fixed table without
crowning possibilities. Wila also supplies
Custom Made crowning systems, types CVB
and CVB/D, as well as the
centrally-adjustable crowning equipment,
type CVB/DZ, developed specifically for
folding presses.
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Copyright [2005 [Diamond Machinery Company]. All rights reserved |
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