Development of forming method of curved small tubes with helical fins using extruding press

• Project/Area Number: 20560101
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: University of Fukui
• Principal Investigator: SHIRAISHI Mitsunobu University of Fukui, 工学部, 教授 (30144885)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 押出し / チューブ / ヘリカルフィン / 成形技術 / 傾斜ダイス / 曲げ / 湾曲チューブ / 材料流動制御

Research Abstract

For producing curved heat exchanging tubes with helical fins, an effective forming process in which a billet is extruded through inclined dies is proposed. The extrusion tests are carried out using an extrusion apparatus designed specially in order to investigate the formability of the extrusion process. It is clarified that the curved tubes with the straight fins are easily formed, but the tubes with the helical fins deformed spirally are obtained by applying the extrusion process.