現在，工業製品の高品質化に伴いその材料にも高い品質rnが求められている。それに応えるため鉄鋼各社において，rn板材であれば平坦度の改善，残留応力の逓減，高効率化はrn重要な課題である。%Most of metal products are manufactured through leveling process. In late years, with improvement of product quality and precision, materials with high quality are demanded. However, automation of leveling process does not advance. For automation of leveling process, elucidation of deformation mechanism of plate in leveling process is important. In this paper, the leveling effect of stable zone, the leveling effect of unstable zone and the change in mechanical qualities of material after leveling were examined. As a result, the following things were found.rn1) Curls and waves except the top and end of plates are leveled enough, when large bending deformation of more than plastic deformation ratio 70% are given to the plates more than twice.rn2) The curl at the top of plates gets in an irrelevant condition by leveling, but it can be leveled in a proper condition. In addition, leveling effects are different depending on the directions of the curls at the top of plates.rn3) Large bending transformation is necessary to get a leveling effect enough. But changes in mechanical qualities of materials occur. In consideration of this abhorrent relation, it is necessary to devise the way how plates are leveled.
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