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Title:
METHOD OF MANUFACTURING EXPANSION θ PIPE AND PRES- FITTING DIE USED FOR THE METHOD
Document Type and Number:
Japanese Patent JP2002178076
Kind Code:
A
Abstract:

To manufacture, through a reduced number of process, an expansion θpipe in which a partition plate and the pipe body are suitably in close contact with each other.

A partition plate 15, which is prepared by press-working of a metallic plate material, is inserted into the holding space S of a press-fitting die 20, resulting in a state where a pair of half dies 21, 21 hold the wide part 18 and the tapered part 19 of the partition plate 1t6 from both sides, and forming a large cylinder part 28 in the shape of an axially rotating wide part 18 and a truncated cone part 29 in the shape of an axially rotating tapered part 19. In this state, the base 23 of the press-fitting die 20 is pressurized toward a pipe stock 30, thereby pressurizing the partition plate 15 and both half dies 21, 21, with the partition plate 15 press-fitting from the end of a narrow part 17 to the pipe stock 30. Consequently, the partition plate 15 is arranged inside the pipe stock 30, and simultaneously, the pipe stock 30 is expanded.


Inventors:
Yamamoto, Keiichi
Sugiura, Masayuki
Ono, Kazunari
Application Number:
JP2000000374424
Publication Date:
June 25, 2002
Filing Date:
December 08, 2000
Export Citation:
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Assignee:
FUTABA INDUSTRIAL CO LTD
International Classes:
F01N1/08; B21D41/02; B21D53/84; F01N13/18; F16L9/19; (IPC1-7): B21D53/84; B21D41/02; F01N1/08; F01N7/18; F16L9/19
Domestic Patent References:
JP2000197935A
JPH07284865A
JP2000265843A
JPS4728372B1
Attorney, Agent or Firm:
足立 勉 (外1名)