Dimpling and riveting method and apparatus

Details Dimpling and riveting method and apparatus Dimpling and riveting method and apparatus

1989-07-26

1991-08-27

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Assembling or joining

295241, B21J 1512

Patent

active

050421379

ABSTRACT:
A method for dimpling and riveting a workpiece wherein the workpiece is clamped, the dimpling, drilling and riveting are performed sequentially while the workpiece is clamped, and the workpiece is heated prior to dimpling. During clamping a pressure foot force is applied to one side of the workpiece, and during dimpling a force is applied to the opposite side causing movement of the workpiece a small distance and against the pressure foot force. The dimpled recess in the workpiece is in the general shape of a truncated cone, and the drilling provides a rivet-receiving hole through the workpiece in the recess. When it is desired to provide a fluid-tight seal, the minor diameter of the truncated cone is made slightly greater than the diameter of the rivet-receiving hole thereby providing an annular step or ledge extending between the hole and the outwardly diverging wall of the dimpled recess. During upsetting of the rivet there is a radial compression of the workpiece material in the region of the annular step to provide a fluid-tight seal between the rivet and the workpiece.

REFERENCES:
patent: 2216403 (1940-10-01), Oeckl et al.
patent: 2413518 (1946-12-01), Rechton et al.

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