Milling aluminum alloy mainly has the following characteristics：1. The low hardness of the aluminum alloy Compared with titanium alloys and other quenched steels, aluminum alloys have a lower hardness. Of course, heat-treated, or die-cast aluminum alloys have a higher hardness. Generally, the HRC hardness temperature of the ordinary aluminum plate is lower. Which is lower than HRC 40 degrees. Therefore, when processing aluminum alloy, the tool load is small. Because the thermal conductivity of aluminum alloy is better. The cutting temperature of milling aluminum alloy is lower, can improve its milling speed. 2. Low plasticity of aluminum alloy Aluminum alloys have low plasticity and low melting point. When processing aluminum alloy, its stick knife problem is serious, chip removal performance is poor, the surface roughness is also relatively high. In fact, the processing of aluminum alloy is mainly adhesive knife and roughness effect is not good. The problem of aluminum alloy processing can be easily solved as long as the two problems of the adhesive knife and surface quality are solved. 3. The tool is easy to wear Because of the adoption of unsuitable tool materials, aluminum alloy processing, often because of the sticky knife, chip removal and other problems lead to faster tool wear.