| 摘要 |
The invention relates to a method for forming two opposite flanges on a metal sheet, in particular a tapered sheet, for building purposes using a rollformer (1), in which a first flange is formed at a first side (7) of the rollformer (1), and a second flange is formed at a second side (8) of the rollformer (1). According to the invention, the metal sheet is moved from a front end (5) to a back end (6) of the rollformer (1) to provide the sheet with its first flange during its movement, and subsequently the metal sheet is moved from the back end (6) to the front end (5) of the rollformer (1) to provide the sheet with its second flange during its movement. The invention also relates to a rollformer (1) with which it is possible to carry out the above method. <IMAGE> |
