Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1988-06-02
1990-02-20
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72 98, B21D 5306
Patent
active
049015532
ABSTRACT:
A method of manufacturing a metallic tube with a spiral fin for use as a heat transfer tube of a heat exchanger and the like. A solid metallic bar or metallic elementary hollow bar provided with a small hole is supplied to an inclined rolling mill having a plurality of rolls provided with a plurality of annular grooves formed on an outer circumferential surface thereof, and the solid metallic bar or metallic elementary hollow bar is worked into a pierced hollow bar by piercing rolling by means of a piercing plug and at the same time a fin is formed on an outer circumferential surface of the pierced hollow bar to integrate the fin with a body of the tube. Accordingly, the piercing rolling and the formation of the fin on the outer circumferential surface of the tube can be carried out at the same time, so that the manufacturing process can be remarkably shortened and the productivity can be high. In addition, a high fin can be formed and the shape of the fin becomes reliable, whereby the product can be remarkably improved in quality.
REFERENCES:
patent: 1865575 (1932-07-01), Locke
patent: 2005155 (1935-06-01), Moise
patent: 2017388 (1935-10-01), Bannister
patent: 3648502 (1972-03-01), Klug et al.
patent: 3683656 (1972-08-01), Lewis
patent: 3745801 (1973-07-01), Kallfelz et al.
patent: 4153982 (1979-05-01), Przybyla et al.
Hayashi Chihiro
Kuroda Kouichi
Nakasuji Kazuyuki
Larson Lowell A.
Sumitomo Metal Industries Ltd.
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