Claims
- 1. A method of interlocking hemmed together edges of inner and outer panels and preventing disortion of the outer panel, comprising the steps of:
- forming a plurality of raised beads at spaced intervals along the edge of only the inner panel;
- placing the outer panel on a flat platen;
- placing the inner panel inside the outer panel with the raised beads facing away from the outer panel;
- and hemming the edge of the outer panel over the edge of the inner panel by hemming punch means having a plurality of slots therein located to register with the raised beads of the inner panel so that the edge of the outer panel is coined into interlocking engagement with the raised beads of the inner panel and forms a raised bead on the outer panel which overlies and closely fits around the raised bead of the inner panel to thereby interlock the inner and outer panels together against relative movement.
- 2. The method of claim 1 further characterized by the raised bead having a height, and the inner panel having a thickness, and the height of the raised bead being generally equal to the thickness of the inner panel.
- 3. The method of claim 1 further characterized by the raised bead being elongated to provide an elongated shape extending in a direction parallel with edge of the panel.
- 4. The method of claim 1 further characterized by the raised bead being elongated in shape with the elongation extending in a direction perpendicular to the edge of the panel.
- 5. The method of claim 1 further characterized by only a portion of the edge of the outer panel being hemmed over the raised bead of the inner panel.
- 6. The method of claim 3 further characterized by the hemming being performed by a hemming die having slots and the slots in the hemming die having a length longer than the raised bead of the inner panel to allow about 1 millimeter of clearance between the panels at each end of the raised beads.
- 7. A method of interlocking hemmed together edges of inner and outer panels and preventing distortion of the outer panel, comprising the steps of:
- stamping the inner panel to a desired size and shape including forming a plurality of raised beads at spaced intervals along the edge of the inner panel;
- stamping the outer panel to a desired size and shape with the outer panel having a flange forming edge portion adapted to be hemmed over the edge of the inner panel to hem flange the panels together;
- placing the outer panel on a flat platen;
- marrying the inner and outer panel by placing the inner panel inside the outer panel with the raised beads facing away from the outer panel and with fixtures which hold the panels against movement relative one another;
- and hemming the edge of the outer panel over the edge of the inner panel by hemming punch means having a plurality of slots therein located to register with the raised beads of the inner panel so that the edge of the outer panel is coined into interlocking engagement with the raised beads of the inner panel and forms a raised bead on the outer panel which overlies and closely fits around the raised bead of the inner panel of the inner panel to thereby interlock the inner and outer panels together against relative movement.
Parent Case Info
This is a continuation of application Ser. No. 07/678404 filed on Apr. 1, 1991 now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
280929 |
Nov 1990 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Greenwood "Assembly Method" Product Engineering, Jun. 8, 1959, pp. 91-104. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
678404 |
Apr 1991 |
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