Silicon has a corrosive effect on cemented carbide. Although the aluminum alloy with more than 12% Si is generally called high silicon aluminum alloy, and diamond cutting tools are recommended, this is not absolute. With the gradual increase of silicon content, the destructive force of cutting tools is also gradually increased. Therefore, some manufacturers recommend using diamond tools when the silicon content exceeds 8%.
Aluminum alloy with silicon content between 8% - 12% is a transition zone. Both ordinary cemented carbide and diamond tools can be used. However, when using cemented carbide, tools with PVD (physical coating) method, no aluminum element and small film thickness shall be used. Because the PVD method and small film thickness make it possible for the tool to maintain a sharp cutting edge (otherwise, in order to avoid the abnormal growth of the film at the edge, the edge needs to be passivated enough, and the cutting aluminum alloy will not be sharp enough), and the aluminum content of the film material may cause the affinity between the blade film and the workpiece material and destroy the combination between the film and the tool matrix. Because the superhard coating is mostly a compound of aluminum, nitrogen and titanium, it may cause edge collapse due to a small amount of peeling off of cemented carbide matrix with the film.
One of the following three types of tools is recommended:
1. Uncoated ultra-fine particle cemented carbide tools
2. Cemented carbide tools with non aluminized coating (PVD) method, such as tin plating, tic plating, etc
3. Use diamond tools
The chip holding space of the tool should be large. Generally, it is recommended to use 2 teeth, and the front angle and rear angle should be large (such as 12 ° - 14 °, including the rear angle of the end teeth).
If it is only a general milling surface, the indexable surface milling cutter with 45 ° main deflection angle can be used, and the effect should be better when equipped with a blade specially processing aluminum alloy.
Alumina was electrolyzed in the laboratory in 1808 and became aluminum material. It was used as a building material on the spire of the Washington Monument in 1884; Aluminum alloy materials synthesized by adding various metal elements have been widely used in various links in the construction industry. Thickness of commonly used aluminum alloy plate: the thickness of advanced metal roof (and curtain wall) system is generally 0.8-1.2mm (while the traditional is generally ≥ 2.5mm)