Abstract
Angle control in air bending is achieved either by exploiting direct angle measurement
(adaptive forming) or by controlling punch displacement. In general, the desired angle is supplied as
input to CNC press brakes and the choice of punch stroke relies on either analytical or empirical
models. Process geometry and material properties affect the outcome, therefore, full knowledge of
these values is critical. Since a major source of inaccuracies is due to errors in material description
(sheet thickness is critical as well), material data (or, more generally, sheet behavior information)
collection in process is advisable. In air bending, process control can be improved by studying the
total load as a function of punch displacement. This approach becomes more and more interesting
since devices for load measurement are now available on the market.
The aim of this work is to analyze some experimental load measures, collected in actual working
conditions, to evaluate the accuracy of such technique and its potential for in process applications.
Several sheet materials (ferrous and non-ferrous alloys) are studied through both bending and tensile
tests; the resulting material properties (tensile and bending) are evaluated and compared. After data
treatment of punch force signal, the ability of predicting punch displacement needed to reach a
defined bending angle (after springback) is discussed.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
6 articles.
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