Flanged member
Provided is a flanged member that has a tubular shape and includes a flange portion, the flanged member including: a cross-section changing portion of which a cross-sectional shape changes along an axial direction of the flanged member, in which in any two cross-sections in the cross-section changing portion, a perimeter of one cross-section is 1.25 times or less a perimeter of the other cross-section.
1. A flanged member that is obtained by hot blow forming a tubular body, has a tubular shape, and includes a flange portion, the flanged member comprising:
a cross-section changing portion of which a cross-sectional shape changes along an axial direction of the flanged member,
wherein the cross-section changing portion includes the flange portion,
the flange portion is formed along the axial direction and has a width changing along the axial direction, and
in any two cross-sections in the cross-section changing portion, a perimeter of one cross-section is 1.25 times or less a perimeter of the other cross-section.
2. The flanged member according to claim 1 ,
wherein the perimeter of the one cross-section is one time or more the perimeter of the other cross-section.
3. The flanged member according to claim 1 , further comprising:
a rectangular portion of which a cross-sectional shape is a rectangular shape.
4. The flanged member according to claim 3 ,
wherein the cross-section changing portion includes the rectangular portion.
5. The flanged member according to claim 3 ,
wherein a groove along the axial direction is formed in the rectangular portion.
6. The flanged member according to claim 5 ,
wherein a cross-sectional shape of the groove is a semi-arc shape.
7. The flanged member according to claim 3 ,
wherein a ridge along the axial direction is formed in the rectangular portion.
8. The flanged member according to claim 1 ,
wherein a tunnel portion is formed in the cross-section changing portion.
9. The flanged member according to claim 8 ,
wherein a cross-sectional shape of the tunnel portion is a semi-arc shape.
10. The flanged member according to claim 1 ,
wherein the flange portion includes a first flange portion and a second flange portion having a smaller width than a width of the first flange portion.
11. The flanged member according to claim 10 ,
wherein in the flanged member, the first flange portion is formed at a central part in the axial direction, and the second flange portion is formed on each of both end sides of the first flange portion.
12. The flanged member according to claim 1 ,
wherein the flange portion is a portion formed in a plate shape in which pipe walls of a tubular body overlap each other.