The aluminum shell is produced and cast under high temperature conditions. The production speed of aluminum shell is too fast and the cooling intensity is relatively large, which causes some elements in the alloy to be unable to transform into the required elements within the specified time. Because this material has needle-like structure and relatively high hardness, poor plasticity. Moreover, the tensile strength of this manufacturing process is very low, and not only yellow rust will appear at high temperature, but also cracks will appear. The aluminum shell produced in this way will have granular burrs. If this burr is not cleaned, it will have a very bad hand feeling. Such particles often have tadpole-like tails next to them, which will be observed under a microscope. Moreover, the color of this impurity is gray and contains a lot of iron.
Reasons that affect the quality of aluminum housing