| 摘要 |
PURPOSE:To execute a bending at a high speed by placing a plate-shaped filter medium creased in advance, on a die on which circular arcuate crest and trough parts have been provided in parallel, and pushing and holding successively its corresponding punch plate from the circle diameter side. CONSTITUTION:A creased plate-shaped filter medium 2 is pushed against a slanting surface 3a of a die 3 by a clamper 14, and held by an air pressure cylinder 13. A frame plate 7 is made to descend by a hydraulic cylinder 10 and air pressure cylinders 8a-8e are made to descend simultaneously. The lowest punch plate 4a depresses a crease of the innermost diameter side, hits against a trough part 3b of the die 3 and stops, and the first crest and trough are formed. The same operation is executed successively up to a bending of a punch plate 4e, and also the pressure is held, and an annular element 21 is formed. According to this method, a bending of the filter medium is executed at a high speed, and also a variation of a formed article is reduced. |
