Process of forming a cold driven riveted joint
Abstract
Abstract A RIVERTED JOINT FORMED BY A COLD-FORMED BUTTON-HEAD RIVET OF LOW-CARBON STEEL HAVING A SHANK, A TAPERED NECK, AND A FLATTENED SEMISPHEROIDAL HEAD WITH A DIAMETER ABOUT 1.6 TO 1.8 TIMES THE DIAMETER OF THE SHANK, THE OUTER SURFACE OF SAID NECK WHICH ENGAGES THE UPPER EDGE OF THE RIVET HOLE BEING INCLINED ABOUT 20 TO 25 DEGREES RELATIVE TO THE RIVET AXIS. IN FORMING SUCH JOINT THE RIVET IS DRIVEN COLD WITHOUT ANNEALING BY SUBJECTING IT TO A CLAMPING FORCE OF 20 TO 100 TONS TO EXPAND THE SHANK ABOUT 4 TO 10 PERCENT AND THEREBY EXPAND THE RIVET HOLES AT LEAST 2 PERCENT. THE MANUFACTURED HEAD OF THE RIVET IS DEFORMED BY A RIVET-DRIVING MEMBER HAVING A TAPERED RECESS WITH A FLATTENED BOTTOM SURFACE AND A FRUSTO-CONICAL SURFACE GENERATED BY ROTATING ABOUT AN AXIS IN A LINE INCLINED ABOUT 40 TO 50 DEGREES RELATIVE TO SAID AXIS.
Inventors
- 👤 Joseph A Diemer
Bibliographic Details
Claims Analysis
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