Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1996-12-27
1998-07-28
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
29890045, 29727, B23P 1526
Patent
active
057847762
ABSTRACT:
A process for producing a flat heat exchange tube having parallel refrigerant passages in its interior and comprising flat upper and lower walls, opposite side walls and a plurality of reinforcing walls connected between the upper and lower walls, extending longitudinally of the tube and spaced apart from one another by a predetermined distance, using a rolling mill including a central work roll and a plurality of planetary work rolls arranged around a portion of the periphery of the central work roll and spaced apart circumferentially thereof, the central work roll being formed with parallel annular grooves in the periphery thereof. An aluminum sheet blank including a brazing sheet is rolled by the mill and thereby thinned to a predetermined thickness to form a flat portion serving as the lower wall, cause the annular grooves at opposite roll ends to form upright portions providing the respective side walls and the other annular grooves to form vertical ridges providing the reinforcing walls, the upright portions and the vertical ridges projecting from the flat portion integrally therewith. An aluminum sheet comprising a brazing sheet is placed over all the ridges to provide the upper wall and joined to the upright portions to make the upright portions serve as the opposite side walls, and the ridges of the lower wall are joined to the upper wall to form the reinforcing walls.
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Journal of Heat Treating, vol. 1, No. 6, Dec. 1, 1992, "Development of Satellite Mill and Trial Rolling of Profiled Metal Strip" pp. 789-795.
Hirano Hirosaburo
Hozumi Satoshi
Ito Shinji
Kaimura Satoru
Saito Yoshihiro
Cuda Irene
Showa Aluminum Corporation
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