General terms cold roll former line processing:
Roll forming is a process in which a metal plate is developed by gradually bending the metal through a series of roll stands, or passes. Each rack must generate the appropriate amount of deformation for which it is intended. Generally, the level of deformation at each booth is not constant, due to adjustments for springback and conservation dimensions. Since the tool is intended to control the external dimensions of OA plates, cylinders polls are usually designed to work overtime in certain metal stands. Problems in the formation of a system or tool design can not exist if the material is to be overworked in the stands / tools, except those designed for overtime. Therefore, when the roll-forming problems, it is important to examine each stage of the process, not just stand on that problem in the beginning.
Goal of a smooth roll-forming 'work is achieved when a single target line during deformation. Roll formers are designed to be reasonably quiet during operation. They are not designed to work with the material "popping" and wrinkling during surgery. If this happens, the operation should be explored.
Are two basic types of roll-forming systems are used: precut line and postcut linije.Precut line scissors incoming material for a certain length before the roll-forming. During surgery an incision line, roll formed council is continuing and sheared to the required length, after a roll-forming. Figure 1 on page 15 illustrates an example of both types of systems.
Material
One of the main parameters that define the success of the roll-forming of the nature of the material. To determine the optimum process, the tool designer should ensure that material information will be used before designing tools. This includes tangible assets mechanical range, gauge tolerances and form tolerances. In addition, various metallic coatings (hot dip galvanized or Galvalume ® 1 Coated metal), organic coatings or paint will result in differences in performance, even the same set of tools because of their different friction characteristics.
Designer requires a clear understanding of the gauge tolerances to be supplied. Ideally, a more robust operating window can be achieved by a range of tolerance is provided to the tool tools in general design tool for the thickest gauge. The sequence of tools for the full ASTM tolerance while receiving materials with tolerance half or quarter standard will produce a roll former with less robust operating window of any designer or manufacturer of the panel intended.
