| 摘要 |
In order to enable compactness to be achieved with respect to forming, and achieve a reduction in press abrasion, achieve an improvement in workability with respect to bulge processing, and enable forming to be performed efficiently at a low cost, a metallic mold device which constitutes a bulge formation region is arranged in the central area of a device main body, a pipe transport device which constitutes a pipe transport region is arranged on the right side in the figure, and a core metal support device which constitutes a core metal support region is arranged on the left side in the figure. Bulge formation is performed by repeating a series of operations wherein bulge formation is performed by moving an element pipe that has been placed in the pipe transport region from the bulge formation region to the core metal support region and then drawing the element pipe back to the bulge formation region again, thus extruding a flexible pipe in the pipe transport region, and then replacing this flexible pipe with a new element pipe.
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