Deformation Characteristics and Press-Formability of Steel/Aluminium Clad Sheet Metals

钢/铝复合板材的变形特性和冲压成形性

• 批准号: 04650088
• 负责人: YOSHIDA Fusahito
• 金额: $ 1.34万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650088/
• 关键词: Stainless-Steel Clad Aluminium Sheet Metals; Press-Formability; Forming Limit; Localized Necking; Stretch Bending; Unbending; Sheet-Thickness Change; Delamination; 引張り曲げ・曲げもどし; 鋼; アルミニウム系クラッド板; 引張り試験; 張出し試験; 引張り曲げ; 曲げもどし; くびれ発生条件; 成形限界線図 /

Deformation characteristics and press-formability in biaxial stretching and stretch bending/unbending were investigated for warn-roll-bounded (at 400ﾟC) two-ply (SUS430/A1) and three-ply (SUS430/A1/SUS304) clad sheet metals. Delamination during stretch bending/unbending was also discussed for cold-roll-bonded SUS304/A1 clad sheet metals. The results are summarized as follows.(1) The forming limit diagrams (FLD) for the clad sheet metals and their components (SUS304, SUS430 and A1) were experimentally determined. The clad sheet metals of SUS430/A1 and SUS430/A1/SUS304 have higher formability compared with the warn-rolled SUS430 sheet.(2) The forming limit in the positive strain ratio for clad sheet metals has been derived based on Hill's localized necking concept. The predicted FLD by the theory agrees comparativery well with the experimental one.(3) The forming limit in the negative strain ratio for clad sheet metals can be explained by a model of the progress of sheet-thickness imperfection with consideration of void growth (modified M-K theory + void growth).(4) The sheet-thickness change during stretch bending/unbending around a die corner was examined both experimentally and theoretically for the clad sheet metals. The effects of laminate geometry (clad ratio), a die radius and stretching force on the sheet-thickness change have been clarified.(5) Delamination during stretch bending/unbending around a die corner was investigated for a cold-roll-boned SUS430/A1 sheet. Delamination likely occurs when a die radius is smaller and the stretching force is larger. It was found from the numerical simulation of the stretch bending/unbending that the delamination is strongly affected by the normal and shear stresses acting on the laminate boundary of a clad sheet during unbending process.

研究了热辊边界（400°C）两层（SUS430/A1）和三层（SUS430/A1/SUS304）复合板材在双轴拉伸和拉伸弯曲/抗弯过程中的变形特性和冲压成形性还讨论了冷轧粘合 SUS304/A1 复合金属板材在拉伸弯曲/伸直过程中的分层。主要研究结果如下： (1)通过实验确定了SUS304、SUS430和A1复合板材及其成分的极限成形图(FLD)。与温轧SUS430板材相比，具有更高的成形性能。(2)复合板材正应变比的成形极限为理论预测的FLD与实验结果吻合较好。(3)复合板料负应变比的成形极限可以用板厚变化模型来解释。 (4) 对复合金属板在模具拐角处拉伸弯曲/伸直过程中的板厚变化进行了实验和理论检验。层压板几何形状（包层比）、模具半径和拉伸力对板材厚度变化的影响已经阐明​​。（5）研究了冷轧粘合SUS430/模具角周围拉伸弯曲/伸直过程中的分层情况。当模具半径较小且拉伸力较大时，A1板材容易发生分层。从拉伸弯曲/抗弯的数值模拟中发现，分层受法向和剪切的影响很大。在不弯曲过程中作用在复合板层压边界上的应力。

项目成果

F.Yoshida: "STRETCH BENDING AND THE SUBSEQUENT STRAIGHTENING OF SHEET METAL LAMINATES" Advances in Engineering Plasticity and its Applications. 1097-1104 (1993)

F.Yoshida：“金属层压板的拉伸弯曲和随后的矫直”工程塑性及其应用的进展。

Ryutaro HINO, Fusahito YOSHIDA and Tatsuo OKADA: "Biaxial Forming Limit for Stainless/Aluminium Laminates." Proceedings of '93-Spring Meeting of JSTP. Vol.1. 227-280 (1993)

Ryutaro HINO、Fusahito YOSHIDA 和 Tatsuo OKADA：“不锈钢/铝层压板的双轴成形极限”。

F.Yoshida,R.Hino and T.Okada: "Stretch bending and the subsequent straightening of sheet metal laminates" Advances in Engineering Plasticity and Its Applications. 1097-1104 (1993)

F.Yoshida、R.Hino 和 T.Okada：“金属板层压板的拉伸弯曲和随后的矫直”工程塑性及其应用的进展。

日野隆太郎: "ステンレス/アルミニウム積層板の成形限界" 日本塑性加工学会春季講演会論文集(平成6年度). (予定). (1994)

Ryutaro Hino：“不锈钢/铝层压板的成形极限”日本塑性加工学会春季会议论文集（1994 年）（计划）。

Ryutaro HINO, Fusahito YOSHIDA and Tatsuo OKADA: "Fracture of Stainless/Aluminium Sheet Laminates under Biaxial Stress Condition." Proceedings of 71st JSME Meeting. Vol.B. 293-295 (1993)

Ryutaro HINO、Fusahito YOSHIDA 和 Tatsuo OKADA：“双轴应力条件下不锈钢/铝板层压板的断裂”。