Abstract
The presentation in the literature of analyses of the riveting process by upset forging is not new. However, based on the results that have been published to date, it is not easy to produce guidelines for the optimum design of the punch shape because each of these analyses was carried out using models of different sizes. In this paper, the riveting process by upset forging using five types of punches under a constant rivet head volume are investigated. This paper presents experimental findings as well as the results of rigid plastic finite element simulations. The results include the relationship between the upset force and the punch stroke as well as a clarification of the deformation characteristics of rivet heads. Moreover, the distributions of the compressive stress on the riveted plate in relation to joint strength were analysed.
