METHOD OF MANUFACTURING SHAPE

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method for a shape by which wrinkles generated on the inside surface of a joint part of the shapes are effectively reduced. SOLUTION: In the manufacturing method for the shape having a joint part at an end of the web part 1 including a preceding stage in which a projected line 20A is formed at the end of the web part 1 by hot-rolling and a rolling stage for bending forming in which a bent claw 20 which constitutes a part of the joint part 2 by hot bending the project line is formed, a stage in which the ruggedness on the inside surface is smoothed by pressing a roller 3 against the inside surface of a formed part 20B to be bent is interposed on the way of the rolling stage for bending forming.