Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A new schedule-free mandrel-less bending method for straight/pre-shaped long tubes
This paper presented a newly developed bending method, side compression bending (S.C. bending), that makes it possible to bend arbitrary portions of not only straight long tubes but also pre-shaped long tubes, and obtain high precision of the geometrical shape and dimension of the bent portion. Conventional methods, including mandrel or booster bending, were never applicable for such kinds of usage. A series of numerical analyses and experiments was conducted for examination of the efficiency of S.C. bending with emphasis on the defects and circularity. The results showed that S.C. bending was efficient to improve the circularity much more than booster bending even for short tubes, in particular, when the bending radius was relatively large around 2.5-3 times of tube diameter, under which conditions booster bending would cause buckling at the clamp. The advantage was much greater for tubes with length longer than 1 m under which conditions booster bending would cause buckling at the straight part. The proposed S.C. bending would be useful for the manufacturing of straight or pre-shaped long tubes, which are used in construction machines, for example. Side compression bending would be efficient when both ends are previously deformed, bent, swaged or sealed, and mandrels and booster cannot be applied. Therefore, the proposed method would bring significant flexibility in manufacturing as the process designers are able to place tube bending at arbitrary positions of the process line, with fabricating a bent portion with high precision at arbitrary positions of tubes. Side compression bending is excellent in both improvement of circularity, manufacturing complex shaped long tube, and giving flexibility to process scheduling.
A new schedule-free mandrel-less bending method for straight/pre-shaped long tubes
This paper presented a newly developed bending method, side compression bending (S.C. bending), that makes it possible to bend arbitrary portions of not only straight long tubes but also pre-shaped long tubes, and obtain high precision of the geometrical shape and dimension of the bent portion. Conventional methods, including mandrel or booster bending, were never applicable for such kinds of usage. A series of numerical analyses and experiments was conducted for examination of the efficiency of S.C. bending with emphasis on the defects and circularity. The results showed that S.C. bending was efficient to improve the circularity much more than booster bending even for short tubes, in particular, when the bending radius was relatively large around 2.5-3 times of tube diameter, under which conditions booster bending would cause buckling at the clamp. The advantage was much greater for tubes with length longer than 1 m under which conditions booster bending would cause buckling at the straight part. The proposed S.C. bending would be useful for the manufacturing of straight or pre-shaped long tubes, which are used in construction machines, for example. Side compression bending would be efficient when both ends are previously deformed, bent, swaged or sealed, and mandrels and booster cannot be applied. Therefore, the proposed method would bring significant flexibility in manufacturing as the process designers are able to place tube bending at arbitrary positions of the process line, with fabricating a bent portion with high precision at arbitrary positions of tubes. Side compression bending is excellent in both improvement of circularity, manufacturing complex shaped long tube, and giving flexibility to process scheduling.
A new schedule-free mandrel-less bending method for straight/pre-shaped long tubes
Kuboki, Takashi (Autor:in) / Takahashi, Kazuhito (Autor:in) / Ono, Kazuhiko (Autor:in) / Yano, Kozo (Autor:in)
2013
4 Seiten, 11 Bilder, 3 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
Rohr , Vorformen , Biegeumformen , geometrische Form , Dimension , Genauigkeit , numerische Analyse , Experiment , Biegeradius , Knicken , Baumaschine , Flexibilität
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