| 摘要 |
In the method for manufacturing a pipe with a partition, a flat plate is molded such that a pair of semidivided cylindrical portions are arranged in parallel to each other through a connecting portion, a U-shaped partition forming portion is so formed in the pair of semidivided cylindrical portions as to project inwardly thereof, and the partition forming portion is compressed from the two sides thereof to thereby form a semidivided partition portion. The connecting portion situated between the partition forming portion is cut to thereby form an escape hole. The escape hole is formed of not only by first and second lateral-direction lines opposed to each other with a gap between them and crossing the connecting portions but also by first and second longitudinal-direction lines connecting together the end points of the first and second lateral-direction lines on the same side thereof, and the distance between the first and second longitudinal-direction lines decreases as they approach the centers of the longitudinal-direction lines. Further, the compression of the U-shaped partition forming portion is carried out in such a manner that the compression and deformation amounts of the other portions of the U-shaped partition forming portion than the leading end portion thereof are larger than that of the leading end portion.
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