Effects of rib dimension reduction and orientation change of inner spiral ribbed copper tube using tube sinking method

Name: Tanit Tangsri

Organization : King Mongkut's Institute of Technology Ladkrabang. Department of Mechanical Engineering

Name: Somchai Norasethasopon

Organization : King Mongkut's Institute of Technology Ladkrabang. Department of Mechanical Engineering

keyword: Inner spiral ribbed tube

ThaSH: Pipe, Copper

; Small size tube

ThaSH: Heat -- Transmission

; Tube sinking method

ThaSH: Heat flux

Abstract: This paper deals with the development of ultra-small inner spiral ribbed copper tubes with high quality heat transfer. Due to increased sophistication of modern electronic equipment and electrical appliances, the production technology of inner spiral ribbed fine tubes must allow for the manufacturing of the ultra-small tubes of small size, high quality, high functionality, and at low processing cost. The conventional production method, however, is suitable for production of large tubes with high drawability but not suitable for long ultra-small tubes because with the conventional technology it is difficult to manufacture an ultra-small spiral ribbed mandrel and a floating plug. The aim of this research paper is to identify the optimal reduction area per pass using tube sinking method in light of the effects of rib dimension reduction and orientation change of the inner spiral ribbed copper tube. Twenty-one seamless inner spiral ribbed copper tubes are used as specimens. The specifications of the copper tubes are of 5.00 mm outer diameter, 3.71 mm inner diameter, 0.364 mm wall thickness, 0.28 mm rib height, 0.33 mm rib base width, 0.175 mm rib tip width, 38O spiral angle, 0.393 mm rib pitch, and 45 ribs. In the experiment, the reduction area per pass (Re/P) is increased for each successive tube specimen; that is, Re/P is 2.52 percent for the first tube specimen, 5.18 percent for the second tube specimen, and so on until Re/P is 86.63 percent for the twenty-first tube. Then, all twenty-one tubes are analyzed with respect to nine parameters: reduction per pass ratio, drawing force, drawing stress ratio, wall thickness ratio, rib height ratio, rib base width ratio, rib tip width ratio, rib pitch ratio, and rib spiral angle ratio. The results have indicated that the optimal reduction area per pass in the case of ultra-small inner spiral ribbed copper tubes is 49.76 percent.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2013

Modified: 2025-11-07

Issued: 2025-11-07

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BibliograpyCitation : ใน มหาวิทยาลัยบูรพา คณะวิศวกรรมศาสตร์. การประชุมวิชาการเครือข่ายวิศวกรรมเครื่องกลแห่งประเทศไทย ครั้งที่ 27 (ME-NETT 2013) (AMM2030). ชลบุรี : มหาวิทยาลัยบูรพา

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