FOLDING METHOD AND FOLDING SYSTEM USING PRESS BRAKE

WIPO Patent Application WO/2011/096442

A1

A final target press distance of an upper die against a workpiece can be calculated from a single folding. An upper die is forced into a V-shaped groove by a set press distance (St1) corresponding to a set finished angle (θ1) that is set so as to be larger than a specific finished angle (θF) of a workpiece from which a load applied thereto is removed when the workpiece is brought into contact with slopes of the V-shaped groove, and a finished angle (θM) of the workpiece is measured. A target press distance (StT) is calculated such that an inclination (f1) of a first straight line and an inclination (f2) of a second straight line satisfy a predetermined relationship in an St-θ graph indicating the relationship between a press distance (St) and a finished angle (θ), where the first straight line passes through a measuring point that is defined by the measured finished angle (θM) and the set press distance (St1) and an inflection point that is defined by the specific finished angle (θF) and a specific press distance (StF) corresponding to the specific finished angle (θF), and where the second straight line passes through the inflection point and a machining point that is defined by the target press distance (StT) corresponding to a target finished angle (θT).

WANG ZHIGANG (JP)

PCT/JP2011/052168

August 11, 2011

February 02, 2011

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UNIV GIFU (JP)
WANG ZHIGANG (JP)

B21D5/02

JPH0824955A	1996-01-30
JPH0120927B2	1989-04-19
JPH0390217A	1991-04-16
JP2004202545A	2004-07-22
JPH10128452A	1998-05-19

YAMAMOTO, Yoshichika et al. (JP)
Yoshichika Yamamoto (JP)

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