BENDING WORK METHOD FOR PLATE MATERIAL AND DEVICE FOR ADJUSTING RESIDUAL STRESS

Title:

BENDING WORK METHOD FOR PLATE MATERIAL AND DEVICE FOR ADJUSTING RESIDUAL STRESS

Document Type and Number:

WIPO Patent Application WO/2012/096362

Kind Code:

A1

Abstract:

A device for adjusting residual stress comprises: an input means for inputting information relating to cutting; a residual stress database associating a plurality of cutting conditions with the resulting residual stresses thereof; a processing condition database associating a plurality of processing conditions for adjusting residual stress with the resulting residual stresses thereof; a first searching means for, according to the information, searching for one residual stress (σ0) from the residual stress database; a calculation means for calculating a first bending moment (Mrs) produced at an edge line by the residual stress (σ0) and, from the information, a second bending moment (Mz) produced at the edge line by the bending to calculate a total bending moment (Mrs - Mz) and for calculating the curvature (ρz) of warpage produced in a workpiece by the total bending moment (Mrs - Mz); a comparison means for comparing the difference (|ρz - ρz0|) between the curvature (ρz) of warpage and a target value (ρz0) with an allowed value (ρ); a second searching means for, when the difference (|ρz - ρz0|) exceeds the allowed value (ρ), searching for one processing condition satisfying an allowed condition (|ρz - ρz0| ≤ ρ) from the processing condition database; and an adjusting means for adjusting, according to the searched processing condition, the residual stress of the workpiece in the range having a first width from a cutting edge and not including the bending line.

Inventors:

JIN YINGJUN (JP)
SHIBATA TAKAHIRO (JP)
KOYAMA JUNICHI (JP)
OMATA HITOSHI (JP)

Application Number:

PCT/JP2012/050543

Publication Date:

July 19, 2012

Filing Date:

January 13, 2012

Export Citation:

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Assignee:

AMADA CO LTD (JP)
JIN YINGJUN (JP)
SHIBATA TAKAHIRO (JP)
KOYAMA JUNICHI (JP)
OMATA HITOSHI (JP)

International Classes:

B21D5/01; B21D1/06; B21D5/02

Foreign References:

JP2004098078A	2004-04-02
JPH07116733A	1995-05-09
JPH0890075A	1996-04-09
JPH0824954A	1996-01-30
JPH02147120A	1990-06-06
JPH03128125A	1991-05-31
JP2005177790A	2005-07-07

Other References: