Abstract
With the increasing demand for micro parts using metal laminates in modern production, the manufacturing processes of thin sheet parts have been elevated. However, it is difficult to predict the deformation behavior with miniaturization because of size effects in micro-scale. In this study, the flexible die micro V-bending behavior of Cu/Ni clad foils was investigated. The bending experiments with three different punch angles and Cu/Ni clad foils under different annealed temperatures were performed. The results show that the springback angle increases with the increase of bending angle and annealing temperature. The placement of Cu/Ni clad foils induced compressive stress results in the more obvious thinning of thickness and decreasing of springback angle. The interactive effects of the distribution of deformation zones and compressive stress induced by the interface layer result in the springback behavior of Cu/Ni clad foils during the flexible die micro V-bending process.
Highlights
With the development of products toward miniaturization and complex function, monolayer metal or alloy gradually fails to meet the demand for comprehensive properties of materials in modern production [1,2]
Zhao et al [7] carried out micro-tensile experiments on magnesium alloy foils with different thickness and grain size, and the results showed an obvious size effect on flow stress
Micro-bending experiments of brass foils were conducted and the results demonstrated obvious size effects on the springback angle, i.e., the normalized bending moment increased with the reduction of foil thickness [11]
Summary
With the development of products toward miniaturization and complex function, monolayer metal or alloy gradually fails to meet the demand for comprehensive properties of materials in modern production [1,2]. Zhao et al [7] carried out micro-tensile experiments on magnesium alloy foils with different thickness and grain size, and the results showed an obvious size effect on flow stress. Micro-bending experiments of brass foils were conducted and the results demonstrated obvious size effects on the springback angle, i.e., the normalized bending moment increased with the reduction of foil thickness [11]. Liu et al [15] proposed that the decrease of sheet thickness or the increase of grain size results in a large angle of springback. The effects of material parameters, placement modes, and die structures on the micro-bending process and springback of Cu/Ni clad foil were analyzed through experiments and finite element simulation
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