土屋 総二郎 デンソー株式会社, 生産技術部, 研究部長
SAKAI Katsuhiko Grad.School of Eng., Nagoya Univ., Assis.Professor, 工学研究科, 助手 (80262856)
NAKAMOTO Takeshi Grad.School of Eng., Nagoya Univ., Assoc.Professor, 工学研究科, 助教授 (30198262)
MATSUMURO Akihito Grad.School of Eng., Nagoya Univ., Assoc.Professor, 工学研究科, 助教授 (80173889)
TSUCHIYA Sooichiro Denso CO Ltd., Development Research, Manager
|Budget Amount *help
¥13,400,000 (Direct Cost : ¥13,400,000)
Fiscal Year 1998 : ¥1,400,000 (Direct Cost : ¥1,400,000)
Fiscal Year 1997 : ¥12,000,000 (Direct Cost : ¥12,000,000)
The process of tube ironing is done without sliding friction which is the main cause for galling and breakage in conventional ironing. In this process a number of rollers rotate around the cone while revolving around their respective axis. The process "Planetary Conical Rolling" is termed PCR.This process has the following advantages : (1) rollers are supported by a shaft being free of lateral force, (2) the diameter of the shaft is almost the same as the inner diameter of the product, (3) high rigidity of the shaft results in high accuracy of products, (4) rollers inclination does not allow slide between roller and material in the radial direction. The results show this process can produce thickness reduction larger than 0.89 with mirror-finished outer surface. In order to make use of these characteristics, products having surface features were formed by flowing material into a concave on a die. A thread was chosen as the surface feature under the consideration of its practical uses. A formed thread has an excellent quality, but when it comes to thin tubes, forming by conventional rolling methods is difficult. The present method examine forming thin tubes. The results show that a higher filling rate of a material into the concave can be obtained by a higher radial pressure which is controlled by the feed speed. The main reason for the successful thread formation by PCR is that the concave is filled by a step by step incremental process of the PCR.
(1) 接合部の特徴領域はI領域(Interpenetration region,食い込み領域),P領域(Pressure welding region,圧接領域),S領域(Smooth region,平滑領域),A領域(Abrasion region,擦過領域),T領域(Through region,通り抜け領域)に分かれ,特に圧接のP段階を生じさせることが重要である.