The effect of the die geometry on the joint strength of Al 3105 aluminum sheets joined by the clinching process

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin, Iran

2 Associate Professor, Department of Mechanical Engineering, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin, Iran

Abstract

In this paper, the effect of the die geometry on the joint strength of the clinching process is investigated. The AA3105 aluminum sheets are joined using different die geometries. After determining the suitable range of the joining load (25-32kN), the effect of the die geometry on the joint strength is considered, using shear and peel tests. The results indicate that the die geometry and punch penetration depth are the most important parameters affecting the joint mechanical interlock and neck thickness. In the range of proper mechanical joint, the die geometry has a great effect on the strength and geometry of the joint, while the effect of clinching load is negligible. The investigated punch diameters were 4, 4.5, and 5mm, where the optimum punch diameter was 5 mm. At the diameters higher than the optimum value, due to the low clearance between the punch and die, the neck thickness is reduced, leading to the joint failure. However, at the diameters lower than the optimum value, due to the higher clearance, the material flows easily from the bottom side, leading to a weakness in the mechanical interlock and joint strength. Although a negligible effect of clinching force on the joint strength, its effect on the joint energy absorption capacity is meaningful. As the joint energy absorption capacity will be the highest at an optimum clinching load. The highest joint strength was achieved at the punch diameter and clinching force of 5mm and 30kN, which resulted in the joint shear strength of 1355N.

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Iranian Journal of Manufacturing Engineering
Volume 7, Issue 12
February 2021
Pages 10-23

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