The Effect of the Constrained Groove Pressing Process on Mechanical Properties of Thin Pure Copper Sheets

Document Type : Original Research Paper

Authors

Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Iran.

10.22084/jrstan.2023.26827.1222

Abstract

Thin copper sheets with micro-dimensional thickness are increasingly used in forming processes. Copper is widely used in electronic industries and in many cases, it is required in the form of thin sheets with a thickness of less than 1 mm. However, decreasing the thickness of the sheet and extending its order to grain size leads to some problems such as dispersion of laboratory results and reduced material strength. In this study, an attempt has been made to improve the mechanical properties of copper sheets by applying the cold working method of Constrained Groove Pressing (CGP). By applying the accumulated plastic strains, the grain size decreased and the ratio of the sheet thickness to the grain size increased, thereby the mechanical properties of the sheet were improved. The results show that the application of the CGP process increases the ultimate strength up to 25% and the yield stress up to 114%. Moreover, it reduces the maximum strain up to 77% and increases the hardness up to 100%. The cross-sectional images taken by an optical microscope show changes in grain density and size under this CGP process. A finite element (FE) simulation has been performed to investigate the effect of the CGP process on the micro deep drawing process. The obtained results show a decrease in the Limiting Drawing Ratio (LDR) from 1.96 for as-received material to 1.7 for one pass and two passes and to 1.34 for three passes CGPed blank. Furthermore, a uniformity in shell thickness (STH) was observed along the cross-section of the blank. 

Keywords

Journal of Stress Analysis

Articles in Press, Accepted Manuscript
Available Online from 26 June 2023

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