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Press Brakes |
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Press brake eliminates springback issues |
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 The Bystronic PR range of press brakes eliminates issues related to bend repeatability and springback caused by varying material thickness and tensile strength.
The PR range has tonnage from 66 tons to 4000 tons. The PR system
(pressure referencing) consists of pressure sensors mounted in the
ram’s cylinders as well as in the hydraulic manifold. These sensors are
measuring pressure 4,000 times per second. Combined with pressure
feedback, there are linear scales on each ram guideway to check ram
position to within .0004 in. Hydraulic crowning is also part of the PR
system. Upon cycle start, the ram rapids down to the switch point, then
goes into feed and just touches the work: the system is able to measure
the material thickness to within .0004 in. It then applies enough
tonnage to make the programmed bend. At bottom dead centre (BDC), the
machine backs up enough to cause a 50% drop in BDC tonnage. The
distance required for the pressure drop is measured by the scales; then
the ram moves down again, this time, double the distance for the
pressure drop. The springback has now been eliminated.
bystronic.com
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