Effect of Initial Thickness on Cross-Shaped-Tube Hydroforming of Small-Diameter Tubing

DOI Web Site Web Site 9 References

Bibliographic Information

Other Title
  • 小径銅管の液圧バルジクロス成形に及ぼす初期肉厚の影響
  • ショウケイ ドウカン ノ エキアツ バルジクロス セイケイ ニ オヨボス ショキ ニクアツ ノ エイキョウ

Search this article

Description

There must be some differences in deformation characteristics between thin- and thick-walled tubes in tube forming. Experimental results using copper tubing of 8 mm outer diameter (D) are discussed. 0.5- and 0.8-mm-thick specimens were used in cross-shaped-tube hydroforming. Long protruding branches were formed under a constant fluid pressure range and a relatively large amount of axial feeding of approximately 4D. It was revealed that the 0.8-mm-thick specimens have a wider range of faultless forming conditions than the 0.5-mm-thick ones. It seems that there is a thickness threshold between 0.8 mm (0.10 D) and 0.5 mm (0.06 D). In addition, the conditions for contact between the tubular specimen and the die strongly affected the forming results. A MoS2 spray and PTFE sheets were used as lubricants to examine the effects of friction on axial feeding force and tube deformation. The highest axial feeding force was recorded under the forming condition of the 0.8-mm-thick tubing and MoS2 spray without PTFE sheets. Forming pressure had a small effect on feeding force. The length of the formed branches depended on forming pressure and the type of lubrication.

Journal

References(9)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top