Title:
METAL TUBE-TWISTING METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/157168
Kind Code:
A1
Abstract:
In the metal tube-twisting method of an embodiment, when a metal tube (5) is conveyed by a depression-forming roll set (4a), a standard roll set (4b), and a twisting roll set (4c) in said order, the metal tube (5) is twisted by: pressing the metal tube (5), which has a substantially circular cross-section, toward the tube interior using the depression-forming roll set (5a) to form depressions (53); bringing the standard roll set (4b) into contact with the metal tube (5) from specified directions; and providing the twisting roll set rotated in the tube circumferential direction from the contact surfaces of the standard roll set (4b) according to the desired twisting angle with respect to the pitch from the standard roll set (4b) in the tube axis direction, and pressing the metal tube (5).
Inventors:
SANO SHOTARO (JP)
YURA SHIGEO (JP)
YAMAMOTO KENJIRO (JP)
YURA SHIGEO (JP)
YAMAMOTO KENJIRO (JP)
Application Number:
PCT/JP2014/058226
Publication Date:
October 02, 2014
Filing Date:
March 25, 2014
Export Citation:
Assignee:
NIPPON STEEL & SUMIKIN METAL PRODUCTS CO LTD (JP)
International Classes:
B21D11/14; B21D15/04
Foreign References:
| JPS58196124A | 1983-11-15 | |||
| US3533267A | 1970-10-13 | |||
| JPS57142715A | 1982-09-03 | |||
| JPS61259838A | 1986-11-18 | |||
| JPH0780556A | 1995-03-28 | |||
| JPS48102285A | 1973-12-22 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)
Yoshiki Hasegawa (JP)
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