The crack of aluminum profile is the phenomenon of metal transverse tearing with different degrees on the surface under the action of tensile stress during extrusion. After analysis, there are three main reasons for this phenomenon:

First, the metal surface is subjected to additional tensile stress due to friction, and cracks will occur when the additional tensile stress is greater than the tensile strength of the metal surface;

Second, when the extrusion temperature is too high, the tensile strength of the metal surface decreases and cracks occur under the action of friction;

Third, when the extrusion speed is too fast, the additional tensile stress on the metal surface increases, resulting in cracks in the profile.

The way to solve this problem is to strictly control the extrusion process parameters to ensure reasonable outlet speed and outlet temperature, so as to reduce the crack phenomenon of aluminum profile. This requires the company to strictly control and supervise the production process.