Investigation of the influence of the rivet geometry on joint formation for a versatile self-piercing riveting process

铆钉 过程(计算) 接头(建筑物) 机械工程 主管(地质) 结构工程 GSM演进的增强数据速率 工程类 材料科学 计算机科学 地质学 操作系统 电信 地貌学
作者
F. Kappe,Mathias Bobbert,Gerson Meschut
标识
DOI:10.1177/09544089241263141
摘要

Climate change has led to a large number of countries deciding to reduce carbon dioxide (CO 2 ) emissions significantly. As the mobility sector is a major contributor to CO 2 , various strategies are being pursued to achieve the climate targets set. An increasingly applied lightweight design method is the use of multi-material constructions. To join these structures, mechanical joining technologies such as self-pierce riveting are being used. As a result of the currently rigid tool systems, which cannot react to changing boundary conditions, a large number of rivet–die combinations is required to join the rising number of materials as well as material thickness combinations. Thus, new, versatile joining technologies are needed that can react to the described changes. The versatile self-piercing riveting (V-SPR) process is one possible approach. In this process, different material thicknesses can be joined by using a multi-range capable rivet which is set by a joining system with extended actuator technology. In this study, the V-SPR joining process is analysed numerically according to the influence of the geometrical rivet parameters on the joints characteristics as well as the resulting material flow. The investigations showed that the shank geometry has a decisive influence on the expansion of the rivet. Furthermore, the rivet length could be proven to be an influencing factor. By changing the head radii and the protrusion height, the forming behaviour of the rivet head onto the punch-sided joining part could be improved and thus the formation of air pockets was prevented. Based on the numerical investigations, a novel rivet geometry was developed and produced by machining. Subsequently, experimentally produced joints were analysed according to their joint formation and load-bearing capacity.

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