| 摘要 |
<p>PURPOSE:To minimize the scale and cost of equipments for manufacturing a side board, by adopting such a fabricating procedure as to conduct preliminary bending step by using a press brake and then execute roll forming process by using a small number of forming rolls. CONSTITUTION:A work W is pressed between a bottom die D1 and a top die D2 to form bent sections 21 and 22 of a top reinforcement part 2. A half-finished blank of a side board 1 is formed by making all the bends of top and bottom bent sections 2 and 3 in the same manner. After conducting preliminary bending by a press brake in this manner, the blank is held and pressed by a bottom roll R1, side rolls R2 and R3 and a top roll R4, and is gradually fed forwards. Then, the blank is processed by rolls R in 3 or 5 stages to become the side board 1. Further, the strength can be increased by welding the top and bottom edges of the work W to the bent sections 21 and 31 by a welding torch after the completion of the roll forming processes.</p> |
