[China Aluminum Network] The main factors of aluminum cracks:
1. The extrusion temperature is too high, the tensile strength of the metal surface decreases, and cracks occur under friction.
2. Due to friction, the metal surface is subjected to additional tensile stress. When the additional tensile stress is greater than the surface metal tensile strength, cracks will occur.
3. When the extrusion speed is too fast, the additional tensile stress on the surface of the metal increases to cause cracks in the profile.
Solution: Strictly control the extrusion process parameters to ensure a reasonable outlet speed and outlet temperature.
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