Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1989-04-05
1991-01-22
Rosenbaum, Mark
Metal working
Method of mechanical manufacture
Assembling or joining
29520, 29521, B23P 1100
Patent
active
049859781
ABSTRACT:
An improved method and joint structure are provided for assembling a self-clinching fastener to sheet material, particularly thin sheet metal, in which an aperture and a peripheral flange are formed in the sheet metal; thereafter the shank portion of the fastener is inserted into the flange followed by clinching the fastener to the flange to secure the assembly. The sheet metal aperture and peripheral flange can be fabricated in a single work station in which the fabricating tooling punches the sheet metal aperture and extrudes or shapes the peripheral flange between a pair of forming dies. Assembly of the fastener joint with the flanged metal is performed in a second work station in which the fastener shank is inserted into the flange and then the head portion of the fastener is driven into the flange material to begin the clinching step. In the clinching operation the fastener head bends the flange material radially outwardly into enagement with the contiguous sheet metal to produce effectively doubled sheet metal thickness at the annular periphery of the aperture. Further driving the head portion into the bent flange displaces and cold-deforms a portion of the flange material radially inwardly into a locking groove provided in the inserted fastener shank to produce mechanical interlock of the clinched assembly.
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McGuire James T.
Milliser John S.
Chen Frances
Giangiorgi R. A.
Rosenbaum Mark
Textron Inc.
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