Title:
曲がり管 並びにその製造方法 並びにこの曲がり管を適用した排気管システム
Document Type and Number:
Japanese Patent JP7071719
Kind Code:
B2
Abstract:
To provide an exhaust pipe system a bent pipe which suppresses decrease of raw material thickness on the precondition that a starting base stock is made to be flat-plate metal raw material, to provide a manufacturing method of the bent pipe and to provide an exhaust pipe system which applies the bent pipe.SOLUTION: A metal plate material having a proper plate thickness is made to be a work-piece W as a starting base stock, the work-piece W is crumpled in a tubular shape to provide the bent pipe 1, the bent pipe 1 has a curve in a pipe longitudinal direction and a joint line SL of a joint edge Wa of the work-piece is formed on the inner arcuate curve surface CVi side of the curve. Further, the bent pipe 1 has a narrowed part 11 having a smaller diameter than other portions in the way in the pipe longitudinal direction, and recessed parts 12 projected from the outer side to the inner side of a tubular body are formed on the narrowed part 11.SELECTED DRAWING: Figure 1
More Like This:
| WO/2000/010748 | METHOD OF HYDROFORMING TUBULAR MEMBERS |
Inventors:
Yoshihiro Furuhashi
Application Number:
JP2017251343A
Publication Date:
May 19, 2022
Filing Date:
December 27, 2017
Export Citation:
Assignee:
Sakura Industry Co., Ltd.
International Classes:
B21D51/10; B21D5/01; B21D39/03; B21D53/84; F01N3/28; F01N13/08
Domestic Patent References:
| JP2003225724A | ||||
| JP2017185516A |
Attorney, Agent or Firm:
Takahiko Higashiyama
Hiroki Higashiyama
Hiroki Higashiyama