Apparatus for a precise and linear measurement of the bending force userful for determining the springback of a workpiece bent by a press brake

摘要

An apparatus for determining the springback of a workpiece bent by a press brake, said workpiece being placed between the die (4) and the punch (1) of the press brake, comprising the means for detecting the deformation or strain in at least two different and symmetrical positions in the punch (4) or in the punch (1) and translating it into an electric signal; said detection occurring at the start of the process, during bending and release of the punch (1); amplifying and summing the deformation or strain signals coming from each couple of symmetrical position by means of at least one amplifier (5) to eliminate the differences caused by spurious deformations occurring at the start of the bending step, and summing the actual measures of the bending force deriving from the compression components only; transmitting the result of the sum to a controller (6) of the press brake, which processes the collected data and corrects the angle of the workpiece being bent.