Claims
- 1. A method for dimpling and riveting a workpiece comprising a pair of sheets, said method comprising the steps of:
- a) applying clamping pressure to a defined area of the workpiece including applying a biasing force to one side of the workpiece, thereby clamping the workpiece;
- b) dimpling the workpiece in said area while the workpiece is clamped, thereby forming a dimpled recess, said step of dimpling including applying a force to an opposite side of said workpiece in a manner causing movement of said workpiece a small distance during dimpling in a direction against said biasing force so that material stretch in the sheets of said workpiece is controlled such that the sheets stretch together during dimpling rather than stretching relative to each other;
- c) drilling the workpiece in the dimpled recess while the workpiece is clamped, thereby forming a rivet-receiving hole; and
- d) inserting a rivet and upsetting the rivet in the workpiece while the workpiece is clamped.
- 2. The method according to claim 1, further including the step of applying heat to said defined area of the workpiece prior to said step of dimpling.
- 3. A method for dimpling and riveting a workpiece comprising the steps of:
- a) applying clamping pressure to a defined area of the workpiece, thereby clamping the workpiece;
- b) dimpling the workpiece in said area while the workpiece is clamped, thereby forming a dimpled recess, said step of dimpling forming said dimpled recess to have a generally circular base disposed in a plane substantially parallel to said workpiece and a wall extending outwardly from said base;
- c) drilling the workpiece in the dimpled recess while the workpiece is clamped, thereby forming a rivet-receiving hole, said step of drilling forming said rivet-receiving hole to have a diameter slightly less than the diameter of said dimpled recess base thereby forming an annular extension between said hole and said wall of said dimpled recess; and
- d) inserting a rivet and upsetting the rivet in the workpiece while the workpiece is clamped, said step of inserting and upsetting causing a radial compression of the workpiece material in the region of said extension thereby providing a fluid tight seal between the workpiece and the rivet.
- 4. The method according to claim 3, further including the step of applying heat to said defined area of the workpiece prior to said step of dimpling.
- 5. A method for dimpling and riveting a workpiece comprising the steps of:
- a) applying clamping pressure to a defined area of the workpiece, thereby clamping the workpiece;
- b) dimpling the workpiece in said area while the workpiece is clamped, thereby forming a dimpled recess, said step of dimpling forming said dimpled recess to have a generally circular base disposed in a plane substantially parallel to said workpiece and a wall extending outwardly from said base;
- c) drilling the workpiece in the dimpled recess while the workpiece is clamped, thereby forming a rivet-receiving hole, said step of drilling forming said rivet-receiving hole to have a diameter slightly less than the diameter of said dimpled recess base thereby forming an annular extension between said hole and said wall of said dimpled recess; and
- d) inserting a rivet and upsetting the rivet in the workpiece while the workpiece is clamped.
Parent Case Info
This is a divisional of co-pending application Ser. No. 06/492,041 filed on May 6, 1983 and now U.S. Pat. No. 4,858,289.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2216403 |
Oeckl et al. |
Oct 1940 |
|
2413518 |
Rechton et al. |
Dec 1946 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
492041 |
May 1983 |
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