On the China Aluminum Network, it's commonly observed that aluminum extrusion can result in surface cracks due to tensile stress during the process. These cracks manifest as horizontal metal tearing, and their severity varies depending on several factors. The primary causes behind this issue include:
Firstly, friction at the front of the extrusion process exerts additional tensile stress on the metal surface. When this stress exceeds the tensile strength of the material, cracks begin to form. This is particularly common when the billet is not properly lubricated or when the die design isn't optimal.
Secondly, if the extrusion temperature is too high, the surface metal becomes more susceptible to cracking. Elevated temperatures reduce the material’s tensile strength, making it easier for cracks to develop under normal frictional forces.
Thirdly, an excessively high extrusion speed increases the amount of stress applied to the metal surface. This can lead to internal stresses that cause the profile to crack, especially in areas where the cross-section changes abruptly.
To prevent these cracks, it's essential to carefully control the extrusion parameters. This includes maintaining an appropriate extrusion speed and ensuring the temperature remains within the recommended range. By doing so, the risk of surface cracking can be significantly reduced. Companies must also implement strict quality control measures and continuously monitor the production process to ensure consistency and reliability in the final product.
In addition, regular maintenance of the extrusion equipment and proper training of operators play a crucial role in minimizing defects. By combining precise process control with good operational practices, manufacturers can enhance the quality of their aluminum profiles and meet industry standards effectively.
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