[China Aluminum Network] aluminum cracks in the extrusion of the profile is subjected to tensile stress and the formation of different degrees of the surface of the metal tearing phenomenon.
Main reasons 1. The surface of the metal 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 surface metal.
2. When the extrusion temperature is too high, the tensile strength of the metal surface decreases, and cracks occur under the action of friction.
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.
The solution strictly controls the extrusion process parameters to ensure reasonable outlet speeds and outlet temperatures.
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