METHOD AND APPARATUS FOR MANUFACTURING PIPE BODY, PIPE BODY MANUFACTURED BY THE SAME METHOD, INTERMEDIATE FORMED PART OF THE PIPE BODY, SUPPORTING MEMBER AND FRAME STRUCTURE COMPOSED OF THE PIPE BODY AND IMAGE FORMING DEVICE HAVING THEM

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a pipe body by which the pipe body the joint of which is closely contacted by press forming at mass-production is manufactured without variation and stably.;SOLUTION: Intermediate formed parts 14 which have seam composing wall parts 5a, 5b to which a joint 5e belongs and residual composing wall parts and the seam 5e is in the loosely contacted state and an angle which is formed by a composing wall part 15 and an adjacent surface composing wall part 16 of the residual composing wall parts is larger than the angle when the pipe body is completed by bending the metallic plate 16 to form the pipe body 1 having composing wall parts 2, 3, 4 and the joint 5e and the closed cross section is a square shape. After making the seam 5e of the seam composing wall parts 5a, 5b closely contact by forming a convex curved face part 32 which is convex outward on one composing wall part 15 by applying external force to the adjacent surface composing wall part 16, the convex curved face 16 is deformed into a flat shape by applying the other external force to the one composing wall part 15 and the pipe body 1 the seam 5e of which is closely contacted is formed on the basis of springback force by which the one composing wall part 15 intends to back to the shape of the original convex curved face.;COPYRIGHT: (C)2007,JPO&INPIT