Influence of Tooling Geometric Parameters on Clinching Joint Properties for Steel-Aluminum Hybrid Car-body Structures

摘要

In order to solve the difficulties in connecting different materials used in steel-aluminum hybrid car-body structures, the mechanical clinching was chosen as the research object to study the feasibility and the effects of geometric parameters of clinching tools on the joint performance for joining high-strength steel SPFC590 and aluminum alloy A5052-H34. The results show that the mechanical clinching method is feasible to connect the two different materials. When connecting HSS and aluminum alloys, the stamping direction has a great influence on the joint performance, and the obtained joint strength is higher when A5052-H34 is close to punch. In addition, the geometric parameters of the tooling also have important impact on the shear strength and tensile strength of the joints. For upper A5052-H34, neck thickness decreases with the increase of punch radius, punch conical angle and die depth, but increases with the increase of die conical angle. Undercut value reduces with the increase of punch conical angle and die conical angle. With the punch radius increases, undercut value is increased first and then decreases, and there is an optimal value of punch radius. Due to the complex influence law of each parameter, the geometric parameters of clinching tools should be scientifically optimized in order to obtain a joint with excellent performance.