Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1988-09-26
1990-05-29
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
294695, 295241, 10 27PH, 72265, 192107C, B21D 3900, B23P 1100
Patent
active
049283758
ABSTRACT:
A method of forming an integral fastener such as a rivet on a sheet metal component such as part of a clutch plate assembly. The method involves placing the metal sheet between a pair of dies so that portion of the sheet overlies a cavity in one die. The other die has an annular working face which surrounds the cavity in immediately adjacent relationship. A biased plunger is arranged for movement relative to both dies and is receivable in the die cavity with clearance. That plunger is engaged with the sheet portion on the side thereof opposite the cavity so as to apply a bias force to that portion which acts in the direction of the cavity. The annular working face is then applied to the metal sheet so as to compress an annular zone of that sheet. The combined effect of the bias force and the compression then causes material to yield in the annular zone and to be displaced from that zone to flow into the die cavity to form a hollow fastener in the clearance between the cavity and the plunger.
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