Impulsive Riveting Considering Design for Disassembly

概要

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In this study, a new riveting method considering design for disassembly is developed. The method can join sheets by high-speed blanking without drilling them as well as easily disjoin the joined sheets. The joining is carried out as follows: 1) A pair of a rivet with a rivet head and a rivet holder that has already been drilled at the center as the other rivet head is set so that their center axes may agree and two sheets are interposed between them. 2) The rivet shaft set on the upper sheet is struck into sheets by the collision of a weight at high speed and the rivet shaft penetrates the sheets. 3) The rivet shaft penetrating the sheets enters into the hole of the rivet holder and then the tip of the rivet shaft projecting from the hole collides with a die. Then the shaft and the rivet holder are joined because the plastic deformation of the shaft generated by the collision fills up the hole of the rivet holder and the sheets are fastened tightly by both the rivet with the rivet head and the rivet holder. The experimental results showed that the strength of a joint made by the impulsive riveting method was higher than that of a joint made by caulking, and that the deformation of sheets was small. In addition, the joined sheets could be disjoined easily.