| 摘要 |
PROBLEM TO BE SOLVED: To provide a compressive bending method of a special shaped tube excellent in the bending accuracy by which working limit can be remarkably improved regardless of strength level. SOLUTION: In the bending method which is suitable to a special shaped tube having a tapered shape, the bending work is performed in the state where compressive stress is imparted by moving the end to be worked of the special shaped tube in synchronism with the rotation of a rotary bending die while fitting the special shaped tube to the rotary bending die and also moving the feeding end of the special shaped tube faster than the moving speed of the end to be worked while fitting the special shaped tube into the rotary bending die having approximately the same groove as the shape after the bending work by holding both ends composed of the end to be worked of the special shaped tube and a feeding end in the opposite position of the end to be worked or/and by moving a groove guide, having approximately the same groove as the shape of the special shaped tube, which is pushed against the side face of the special shaped tube faster than the feed rate of the special shaped tube. The automotive parts obtained by these working methods are used in the base material of a body or the frame member of the body. COPYRIGHT: (C)2008,JPO&INPIT
|
