日本機械学会論文集
Online ISSN : 2187-9761
ISSN-L : 2187-9761

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板材の逐次プレス成形における曲げ異常部推定手法の提案とその有効性の検証
平野 直哉木村 剛浜 孝之
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ジャーナル オープンアクセス 早期公開

論文ID: 22-00260

この記事には本公開記事があります。
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Sequential press forming of thin sheets is a method in which different locations within a single workpiece are pressed in sequence, and is used to manufacture large structures, such as storage tanks. In the sequential press forming, it is important to estimate bending-defect areas efficiently because a product shape can be corrected not by repairing dies but by only re-pressing the bending-defect areas in the subsequent process. At present, high skill is required to determine bending-defect areas because they are judged by measuring a gap from a template. In this study, a versatile method to estimate bending-defect areas in products obtained with sequential press forming is proposed. Specifically, a cosine similarity is calculated between the product shape and templates of ideal shapes with known defects prepared beforehand. A cosine similarity is calculated based on curvatures. Bending-defect areas are then evaluated from the magnitude of the deviation from the average of the multiple calculated cosine similarities. This paper also presents a procedure to calculate the threshold for estimating bending-defect areas by the proposed method. The effectiveness of the proposed method was confirmed through case studies that considered virtual products and actual workpieces. It was confirmed that the proposed method can estimate bending-defect areas and excess or deficiency of bending even when local deformation and measurement noise exist.

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https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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