Journal
MATERIALS & DESIGN
Volume 56, Issue -, Pages 604-612Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.11.048
Keywords
Microforming; Metal foils; Plastic anisotropy; Surface roughening; Tensile test; Micro-deep drawing
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Funding
- Die and Mold Technology Promotion Foundation [10502,2011]
- Grants-in-Aid for Scientific Research [24760609] Funding Source: KAKEN
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Metal foils are highly advantageous for producing microcomponents with high-aspect-ratio three-dimensional shapes by miniaturizing the process dimensions in sheet-metal-forming technologies. To characterize existing rolled metal foils at manufacturing sites and to clarify the impact of its strong anisotropic properties on micro-sheet formability, tensile tests and micro-deep drawing tests were performed on phosphor bronze foils with thicknesses of 20-300 lm. Focusing on the Lankford value (r-value) as a useful parameter for conventional sheet-metal-formability, the relation between the r-value of ultra-thin rolled foil and its applicability in micro-deep drawing is investigated. Ultra-thin rolled foil is characterized with a higher r-value due to the strong texture of {110} and {111} textures. Although the in-plane tendency of the r-value showed a strong correlation with the thickness distribution of micro-drawn cups, the obtained higher r-value for thinner foils does not correspond to the lower formability of thinner metal foils. As relevant parameter for indicating the forming limit for thin-rolled metal foils, the nonuniformity in thickness due to surface roughening is introduced. The importance of a geometrical anisotropy, such as orientation of surface topography and defects, for the unstable deformation of ultra-thin rolled metal foils is experimentally demonstrated. (C) 2013 Elsevier Ltd. All rights reserved.
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