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.
SUGIURA MASAYUKI
ONO KAZUNARI
| JP2000197935A | 2000-07-18 | |||
| JPH07284865A | 1995-10-31 | |||
| JP2000265843A | 2000-09-26 | |||
| JPS4728372B1 |
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