Title:
MANUFACTURING METHOD FOR HOLLOW TUBES HAVING U-SHAPED BENT PARTS AND MANUFACTURING DEVICE FOR HOLLOW TUBES HAVING U-SHAPED BENT PARTS
Document Type and Number:
Japanese Patent JP2017018963
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a device for efficiently manufacturing hollow tubes having U-shaped parts with a high productivity, as well as easily obtaining hollow tubes having small intervals between respective parallel parts, as well as small apex curvature radii.SOLUTION: A method for manufacturing hollow tubes uses a metal die having a groove into which a tube stock is inserted, and which is formed between a die member constituting an upper die and a die member constituting a lower die, wherein a recessed part is formed at one side of at least one of the upper and lower die members, continued to a space inside the groove, and recessed toward inside of at least the other one of the upper and lower die members, and an ejection member capable of move back and forth to the recessed part through the space inside the groove, is disposed at the other one of the die members. The method for manufacturing hollow tubes comprises: placing the tube stock in the groove; applying a liquid pressure into the tube stock: at the same time, while applying a pressure along an axis line (axial-pressing) from both end parts, advancing the ejection member from the other one of the die members toward the inside of the recessed part to push-in an intermediate part of the tube stock in a longitudinal direction into the recessed part, so as to form the U-shaped bent part of the tube-stock in the recessed part.SELECTED DRAWING: Figure 5
Inventors:
WADA MANABU
IGUCHI KEINOSUKE
MIZUMURA MASAAKI
IGUCHI KEINOSUKE
MIZUMURA MASAAKI
Application Number:
JP2015136265A
Publication Date:
January 26, 2017
Filing Date:
July 07, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
B21D9/15; B21D26/033
Domestic Patent References:
| JPS53113257A | 1978-10-03 | |||
| JP2013107082A | 2013-06-06 | |||
| JP2006231337A | 2006-09-07 | |||
| JPH1119729A | 1999-01-26 | |||
| JP2002219526A | 2002-08-06 |
Attorney, Agent or Firm:
Masatake Shiga
Mitsuo Teramoto
Sumio Tanai
Tomoo Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Sumio Tanai
Tomoo Katsumata
Hiroshi Yamaguchi
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