Title:
MOLDING METHOD OF FLANGE
Document Type and Number:
Japanese Patent JP2017074614
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a molding method of a flange for molding a double flange composed of a bending flange and a folding-back flange formed by folding back the outside end of this bending flange to the matrix side of a pipe on the inside in the radial direction of the pipe, in an end part of the pipe, by press molding.SOLUTION: A preliminary flange 10 is formed by bending an end part of a pipe 1 to the outside in the radial direction, and next, the pipe 1 is restricted by a die 2 so that the predetermined length L1 shorter than a buckling wavelength projects from a side end of the preliminary flange 10 of the pipe 1 from one end part of the die 2, and the pipe 1 is compressed in its axis X-X direction from the preliminary flange 10 side by a punch 7, and a preliminary flange 10 is folded back in the matrix 1a side direction of the pipe 1, and a double flange composed of a folding-back flange and a bending flange is integrally formed in an end part of the pipe.SELECTED DRAWING: Figure 5
Inventors:
TAKAI RYUTA
NOZU KENTARO
NOZU KENTARO
Application Number:
JP2015204874A
Publication Date:
April 20, 2017
Filing Date:
October 16, 2015
Export Citation:
Assignee:
SANGO CO LTD
International Classes:
B21D19/08
Domestic Patent References:
| JPH09203456A | 1997-08-05 | |||
| JP2013049061A | 2013-03-14 | |||
| JPH0755074A | 1995-03-03 | |||
| JP2011240362A | 2011-12-01 | |||
| JPS56133914U | 1981-10-12 | |||
| JP2013188781A | 2013-09-26 | |||
| JP2007175728A | 2007-07-12 |
Foreign References:
| US20050005667A1 | 2005-01-13 | |||
| KR20090022459A | 2009-03-04 |
Attorney, Agent or Firm:
Hasegawa Yoshimichi
Hiroyasu Sugiyama
Hiroyasu Sugiyama