| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe member that has a high-precision cross-sectional shape and various shapes, by applying processing to an annular cross-section straight pipe member without making the straight pipe member cause buckling or rupture.SOLUTION: A pipe member is manufactured by directly and concurrently applying cross-sectional processing and bending to an annular cross-section straight pipe member by upper and lower press molds. In a longitudinal direction of the pipe member concurrently subjected to the different kinds of processing, (i) at least one curved part is provided, and (ii) a cross-sectional shape is identical to a contour of the press mold. |
