Metal working – Method of mechanical manufacture – Structural member making
Patent
1990-04-03
1991-09-24
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Structural member making
295221, 228118, 228157, B21D 3903
Patent
active
050502999
ABSTRACT:
Process for producing a cap flange structure, particularly a sinewave I-beam structure comprises joining together a pair of metal sheets in a predetermined area spaced from the opposite outer edge portions of the sheets, and leaving the area between the adjacent sheets along the two opposite edge portions unattached. The joined together portion of the resulting assembly is formed into a sinewave configuration which forms the web of the I-beam structure. The unattached edge portions of the assembly of adjacent sheets is introduced into a die cavity and the die cavity is heated and a gas under pressure is inserted into the area between the sheets of the unattached edge portions, and expanding the sheets of the unattached edge portions into the shape of the die cavity against the wall of the cavity by an accordion expansion without any substantial stretching or thinning of the sheets, while simultaneously moving such sheets in the die cavity. The expanded sheets are trimmed to form a pair of integral flanges along opposite edges of the web of sinewave configuration, to form a sinewave I-beam structure.
REFERENCES:
patent: 4220276 (1980-09-01), Weisert et al.
patent: 4361262 (1982-11-01), Israeli
patent: 4509671 (1985-04-01), Weisert
patent: 4582244 (1986-04-01), Rainville
patent: 4588651 (1986-05-01), Israeli
Eley Timothy V.
Geldin Max
Martin C. Richard
Rockwell International Corporation
Silberberg Charles T.
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