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Extrusion Riveting Process

IP.com Disclosure Number: IPCOM000079634D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

deKler, D: AUTHOR

Abstract

An extrusion riveting process is illustrated in the drawing. A receiving or work piece 10 is punch pressed with a hole 12, which has a diameter equal to or greater than the thickness of the work piece.

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Extrusion Riveting Process

An extrusion riveting process is illustrated in the drawing. A receiving or work piece 10 is punch pressed with a hole 12, which has a diameter equal to or greater than the thickness of the work piece.

After work piece 10 has been punch pressed to provide the holes, it and a second work piece 14 to be joined in face-to-face relationship therewith, is overlaid and positioned within a die 16 of a punch press.

The die of the extrusion riveting punch press is composed of several parts. Base plate 16 is provided with an expanding pin 18 which protrudes above the surface of the base plate 16, and is of a slightly smaller diameter and has a partially conically shaped protrusion fitting into hole 12. The second work piece 14 is then positioned over plate 10 and a retainer plate 20 is brought into contact with plate 14. A punch pin 22 is then forced by the punch press 24 downward into work piece 14, in effect extruding a portion of the work piece 14 into the hole 12 in work piece 10. As the extrusion transfers into hole 12, it engages the upper surface of pin 18 which acts as a spreader to spread the extruded material to fully fill hole 12.

A characteristic of the hole formed in plate 10 during the punching operation, is that the exit portion of the hole will be slightly larger diameter than the inlet portion and when the extruded material from work piece 14 is caused to fully occupy the full diameter of hole 12, a tight physical interference fi...