VERFAHREN ZUR HERSTELLUNG EINES METALLROHRES MIT SPIRALRIPPEN

• Main Authors: NAKASUJI, KAZUYUKI GEN. RES. LAB. OF SUMITOMO, AMAGASAKI-SHI HYOGO-KEN, JP, HAYASHI, CHIHIRO GEN. RES. LAB. OF SUMITOMO, KURODA, KOUICHI GEN. RES. LAB. OF SUMITOMO
• Format: Patent
• Language: German
• Published: 25.03.1993
• Edition: 5
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING

The present invention relates to a method of manufacturing a metallic tube (T) with spiral fin, used as a heat transfer tube of a heat exchanger and the like. According to the manufacturing method of the present invention, a solid metallic bar (B1) or metallic elementary hollow bar provided with a small hole is supplied to an inclined rolling mill having a plurality of rolls (1, 2, 3) provided with a plurality of annular grooves (7) formed on an outer circumferential surface thereof, and said solid metallic bar or metallic elementary hollow bar is subjected to the piercing rolling by means of a piercing plug (6) and at the same time fin is formed on an outer circumferential surface of the pierced hollow stuff to integrate the fin with a body of tube. Accordingly, according to the present invention, 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, the high fin can be formed and the shape of the fin becomes reliable, whereby the product can be remarkably improved in quality.