1. The purpose of mechanical pretreatment of aluminum
Provide good appearance conditions, improve surface finishing quality; improve product grade; reduce the influence of welding; produce decorative effects; obtain a clean surface.
2. Common methods of mechanical pretreatment of aluminum
Commonly used mechanical pretreatment methods include polishing, sandblasting, brushing, and rolling. The specific pretreatment used depends on the type of product, production method, initial surface state and final finishing level.
3. The principle and function of mechanical polishing of aluminum
The friction between the high-speed rotating polishing wheel and the workpiece generates high temperature, which is the plastic deformation of the metal surface, thereby smoothing the convex and concave points on the metal surface, and at the same time, the extremely thin oxide film on the metal surface that is instantly generated under the ambient atmospheric oxidation is repeatedly ground down. , Thus becoming brighter and brighter. The main function is to remove burrs, scratches, corrosion spots, blisters, pores and other surface defects on the surface of the workpiece. At the same time, the fine unevenness on the surface of the workpiece is further removed, so that it has a higher gloss, until the mirror effect.
4. The principle and function of sandblasting
Use purified compressed air to spray dry sand or other abrasive particles onto the surface of aluminum products to remove surface defects and present a uniform dull sand surface. Main functions: remove burrs, casting slag and other defects and dirt on the surface of the workpiece; improve the mechanical properties of the alloy; obtain a uniform surface matting effect.
5. The principle and function of brushing
Brushing is to use the rotating brush of the brushing wheel to remove burrs and dirt on the surface of the product. The drawing of aluminum alloy means to draw the product, the main purpose is to play a decorative role
6. The principle and function of roller burnishing
Rolling is to put the workpiece into a roller containing abrasives and chemical solutions, and use the rotation of the roller to make the workpiece and the abrasive, and the workpiece and the workpiece rub against each other to achieve the polishing effect.