Metal deforming – By relatively receding work-engaging tool-faces – Embodying three or more tools
Patent
1988-07-18
1989-10-10
Jones, David
Metal deforming
By relatively receding work-engaging tool-faces
Embodying three or more tools
72370, 29446, B21D 4102
Patent
active
048723320
ABSTRACT:
In the setting of blind rivets, the rivets are placed onto a riveting mandrel having a thickened end, the diameter of which is larger than the diameter of the rivet hollow space, in such a way that the rivet head rests on the side remote from the thickened end. Then the rivet, together with the riveting mandrel, is inserted into the bores of the structural parts. The rivet head is then supported by a holding-down part. Finally the riveting mandrel, for opening-out the rivet end projecting through the bores, is displaced against the pressure direction of the holding-down part. In order to be able to reuse the riveting mandrel and to thereby simplify the riveting method and make it less expensive, the thickened end of the riveting mandrel, after adequate opening-out of the free rivet end, is reduced in diameter until it fits through the rivet hollow space, and subsequently the riveting mandrel, at the head side of the rivet, is pulled out of the cylindrical rivet hollow space and reused for the next setting operation. The method is carried out with a rivet tool, into which the riveting mandrel is integrated. 2
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