Roll forming is the most commonly used method for the production of building roofing panels and wall panels with color coated boards. Roll forming machines use a series of differently shaped rolls on a rack to press the steel rolls into the required shape.
Color-coated steel sheet is pressed into various shapes according to the strength and elongation of the steel sheet, coating characteristics, the model of the forming machine and the maintenance status.
In order to improve the on-site performance of the color plate, especially the deformation area of the steel plate, the following requirements should be observed:
(1) Adopting a large bending center radius design can meet the deep shape requirements of architectural design.
(2) Roll design meets the deformation of the steel plate from the middle to the side.
(3) The rolling design is matched with the strength of the steel plate. For example, for high-strength steel plates, the deformation of the same shape may require more deformation passes.
(4) Low-strength steel plates should be selected for complex shapes to allow greater design margin.
(5) Maintain the rolling equipment so that it has the required horizontality and verticality, and sufficient rotating roller clearance to avoid scratching the coating and cleaning the rollers to avoid damage to the topcoat.
(6) The flexible primer and topcoat system are used to increase the performance of the steel plate during bending.
Although roll forming is the most commonly used method for color-coated sheet forming, for the production of roof panels and wall panels, blanking or other accessories may be required. For the same reason, the largest bend radius is needed to improve the performance of the bending part.
It is also very important to avoid scratches on the surface of the coating during the blanking process. Measures to protect the coating surface from scratches can be taken with a stamper protective film. Proper mold clearance should be maintained during pressing.
Embossing is a type of color-coated sheet molding. The embossing process needs to ensure that the plating and coating are not damaged. It needs a sufficiently low embossing sharpness and depth to ensure that the durability of the color-coated sheet is not affected.
Other forming methods for color coated plates include stamping, slotting and perforating. Many of the influencing factors discussed previously, such as die clearance and coating flexibility, are as important as the above forming methods.