Metal working – Method of mechanical manufacture – With separating – localizing – or eliminating of as-cast...
Patent
1977-10-11
1980-03-11
Gilden, Leon
Metal working
Method of mechanical manufacture
With separating, localizing, or eliminating of as-cast...
2924353, 29509, B23P 1900
Patent
active
041920589
ABSTRACT:
A high fatigue slug squeeze riveting process using two clamps, one of which is a fixed position clamp, and an apparatus for carrying out the process is disclosed. A pair of panels or other items to be riveted together are clamped by upper and lower clamps and a hole is drilled through the items. Thereafter, a nonheaded rivet slug is inserted in the hole. After insertion of the slug, upper and lower rams approach the rivet along vertical, axially aligned paths. The upper ram is flanked by a pair of spring-loaded rods, known as pogo feet, which extend past the impinging face of the ram. The lower ram stops at a predetermined position, providing a positioning stop for the rivet slug. The upper ram continues down. Since the pogo feet extend past the impinging face of the upper ram, they contact the adjacent surface of the items to be riveted prior to the upper ram contacting the rivet slug. As a result, the pogo feet push the items to be riveted away from the upper, fixed position clamp prior to the upper ram contacting the rivet slug. The upper ram stops and is locked in position after it bottoms out. At this time, the rivet slug is in position within the hole such that predetermined portions of the slug protrude past the outer surfaces of the panels. The lower ram then moves upwardly, and the rivet becomes captive between the forming surfaces of the upper and lower rams. The ram squeeze force applied to the rivet slug first partially forms the lower head of the rivet. As the lower ram forms the lower head, force produced by the lower ram is partially transferred through the rivet to the items to be riveted, which in turn exert an upward force on the pogo feet that overcomes the spring load on the pogo feet. As a result, the pogo feet, items to be riveted and the rivet are pushed upwardly. The upward movement of the rivet is terminated against the upper ram. This causes the upper head of the rivet to be formed, while the lower head formation is completed.
REFERENCES:
patent: 1365664 (1921-01-01), Cox
patent: 3557442 (1971-01-01), Speller
patent: 3561102 (1971-02-01), Diemer
patent: 3634928 (1972-01-01), Falcioni
patent: 3646660 (1972-03-01), Sheffer, Jr.
patent: 3874070 (1975-04-01), Falcioni
patent: 3948427 (1976-04-01), Claydon et al.
Gilden Leon
The Boeing Company
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