Pharma Packaging Pure Aluminum Foil 8011 H18

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Pharma Packaging Pure Aluminum Foil 8011 H18

In the process of hot rolling, shearing, annealing and quenching of aluminum alloy thick plates, due to changes in temperature, reduction, roll shape, and improper control of process cooling, the longitudinal bending, transverse bending, edge wave and internal stress will cause bad plates. shape, which can be eliminated by straightening. According to the equipment configuration, straightening can be divided into: roller straightening, flattening straightening and pincer stretching straightening. Because straightening is before aging treatment or machining, it is also called pre-straightening. Currently, the most widely used and most effective process is the stretching straightening method.

When the wave and residual stress of the sheet are too large, it cannot be leveled with a roller straightener, but can only be straightened by stretching. When stretching, a certain tensile force is applied to both ends of the sheet, so that the sheet has a certain plastic deformation, and the residual stress in the sheet is eliminated or reduced, so that the sheet is flat. The tensile deformation is about 2%, and the maximum is 4%. If it is too small, it is difficult to eliminate the residual stress. If it is too large, a slip line will be generated, and new internal stress may be induced. If it is too large, it may be broken.

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