Fatigue life enhancement of dovetail connector slots and noncirc

Details Fatigue life enhancement of dovetail connector slots and noncirc Fatigue life enhancement of dovetail connector slots and noncirc

1989-02-16

1989-12-12

Moon, Charlie T.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29558, 72370, 408 1R, B21K 304, B23P 1502, B23P 1304

Patent

active

048858293

ABSTRACT:
A pair of openings (14) are drilled in a workpiece (12) at locations spaced inwardly from an edge (76) of the workpiece (12). Each opening is cold-expanded by the passage of a mandrel (46') only, or a mandrel (46) and split sleeve (58), to create an annular zone of residual compressive stresses (72) in the workpiece material immediately surrounding the openings (14'). Then the workpiece (12) is cut along lines extending from the edge (76) inwardly to central regions of the cold-expanded openings (14'). The workpiece material between the two openings (14') and the two cuts (74) is removed. The edge portions (72) of the material in the vicinity of the cuts (74) and the openings (14') are machined to a final desired size and shape, to define connector slots (84) having cold-expanded round regions bounding the slots (84).

REFERENCES:
patent: 1614558 (1927-01-01), Kasley
patent: 1758235 (1930-05-01), Nash
patent: 2334855 (1943-11-01), Zinkil
patent: 2431249 (1947-11-01), Heppner
patent: 2670639 (1954-03-01), Flowers et al.
patent: 2781998 (1957-02-01), Barr
patent: 3045329 (1962-07-01), Carli et al.
patent: 3137938 (1964-06-01), Arrighini
patent: 3566662 (1971-03-01), Champoux
patent: 4129028 (1978-12-01), Leftheris et al.
patent: 4457059 (1984-07-01), Alorio et al.

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