Metal fusion bonding – Process – With shaping
Patent
1989-11-21
1990-11-20
Heinrich, Sam
Metal fusion bonding
Process
With shaping
228147, 228151, 2281737, 228 17, 228 175, 219 612, B23K 1302, B23K10106
Patent
active
049712403
ABSTRACT:
In a method and apparatus of forming a flat metal strip into a tube having generally flat side walls connected by bight portions along their opposite longitudinal edge portions comprising the steps of directing the strip between a pair of form rolls to bend the opposite longitudinal edge portions of the strip into similar generally upwardly curved edge portions; then directing the strip between a second set of rolls which engage the upwardly curved edge portions to center the strip laterally relative to the rolls and bend the strip along its longitudinal center line to form an upwardly rounded bend therealong while maintaining the portions of the strip on the opposite sides of the center bend relatively flat whereby to impart to the strip a V-shaped cross section having a central apex and oppositely upwardly inclined flat legs, each terminating in a laterally inwardly curved edge; directing the V-shaped strip between one or more additional sets of form rolls to increase the circumferential extend of said apex, decrease the included angle between the legs and thereby displace the inwardly curved edge portions laterally inwardly toward each other into closely spaced, opposed relation and thereafter heating said inwardly curved edge portions and squeezing them laterally together to form a weld seam between the free edges thereof and thereby form the finished tube wherein the seam welded inwardly curved edge portions and said apex form the bight portions of the tube and the legs of the V form the substantially flat side walls of the tube, the improvement comprising directing the strip between a pair of form rolls in advance of the aforementioned first form rolls to first roll the opposite edges of the strip into a configuration comprising flat end portions connected to the central flat portion of the strip by curved portions.
REFERENCES:
patent: 2197963 (1940-04-01), Anderson
patent: 2613303 (1952-10-01), Babbitt
patent: 4024619 (1977-05-01), Jonason
patent: 4558695 (1985-12-01), Kumazawa et al.
patent: 4562326 (1985-12-01), Tan et al.
patent: 4590781 (1986-05-01), Toyooka
Metals Handbook Ninth Edition, vol. 14, pp. 624-635, "Contour Roll Forming", copyright 4-1988.
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