Title:
DEVICE FOR PRODUCING BRANCH PART STRUCTURE IN METAL PIPE, AND METHOD FOR PRODUCING BRANCH PART STRUCTURE IN METAL PIPE
Document Type and Number:
WIPO Patent Application WO/2022/138282
Kind Code:
A1
Abstract:
This device for producing a branch part structure comprises: a die 10 that is formed in a spherical shape and has a long diameter A1 and a short diameter B1 which is shorter than the long diameter A1; and a drawing jig 20 that can connect to the die 10. When the die 10, having been inserted into a pipe 30 in which a burred portion 32 is to be formed, is extracted by the drawing jig 20 connected to the die 10, a first burring process is performed by the die on a lower hole 31 that is formed at a branch part formation position in the pipe 30 and passes radially through the body of the pipe 30. The drawing jig 20 then rotates the extracted die 10 by a prescribed angle about a center axis, and a second burring process is performed on the lower hole 31 by the rotated die 10 from the exterior of the pipe 30.
Inventors:
ARAKI MASANORI (JP)
Application Number:
PCT/JP2021/045805
Publication Date:
June 30, 2022
Filing Date:
December 13, 2021
Export Citation:
Assignee:
ARAKI TECHNICAL & RES CO LTD (JP)
International Classes:
B21D51/16; B21C37/29; B21D19/08
Foreign References:
| JPS57115921A | 1982-07-19 | |||
| JPS308916B1 | 1955-12-07 | |||
| EP1332807A1 | 2003-08-06 | |||
| JP2016209889A | 2016-12-15 | |||
| JP2016209889A | 2016-12-15 |
Attorney, Agent or Firm:
SOGA, Michiharu et al. (JP)
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