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

摘要

A device for regulating a residual stress is comprised of: input means; a residual stress database; a process condition database; first searching means for searching a residual stress (Ã0) from the residual stress database; a calculator for calculating a first bending moment (Mrs) in a ridge line originated from the residual stress, and a second bending moment (Mz) in the ridge line originated from bending to obtain a total bending moment (Mrs - Mz) and calculating a camber curvature (pz) of the workpiece originated from the total bending moment (Mrs - Mz); comparing a difference (|Áz -Áz0|) between the camber curvature (pz) and a target value (Áz0) with a tolerable value (p); second searching means for searching a process condition satisfying a tolerable condition (|Áz -Áz0| ‰¤ p) from the process condition database when (|Áz -Áz0| > p); and regulating means for regulating a residual stress.