METHOD FOR BENDING METAL SHEET AND DEVICE FOR REGULATING 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 (sigma0) 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 (rhoz) of the workpiece originated from the total bending moment (Mrs-Mz); comparing a difference (|rhoz-rhoz0|) between the camber curvature (rhoz) and a target value (rhoz0) with a tolerable value (rho); second searching means for searching a process condition satisfying a tolerable condition (|rhoz-rhoz0|@rho) from the process condition database when (|rhoz-rhoz0|>rho); and regulating means for regulating a residual stress.