ã€China Aluminum Industry Network】 (1) When reclaiming, moving, and stretching aluminum alloy profiles, they must not be rubbed, pulled, overlapped, crowded, or entangled. Instead, they should be placed at appropriate intervals to prevent damage. For profiles that are prone to bending or deforming, it's essential to process them promptly and, when necessary, protect them from contact with other parts to avoid further issues.
(2) Stretching of aluminum alloy profiles should only begin after the material has cooled down to below 50°C, where it can be safely handled by hand. If stretched while still hot, the profiles may warp, leading to burns or defects such as internal stress, bending, twisting, and poor performance. This is especially important before aging, as improper heat treatment can result in long-term structural problems.
(3) Due to the heat-resistant diffusion effect, aluminum profiles with high decorative finishes should be flipped upside down before and after heating. This helps ensure even heat dissipation and reduces horizontal bright spot defects caused by uneven cooling and crystallization. This step is particularly crucial for large, thick profiles where thermal stress can be more pronounced.
(4) Pay close attention to the tolerances of complex features such as small feet, thin teeth, long legs, curved surfaces, inclined planes, openings, and irregular angles. These areas are more susceptible to deformation under force, which can lead to twisting, spiraling, or other dimensional issues. Proper handling and controlled stretching are vital to maintaining the integrity of these delicate sections.
(5) The amount of stretching should typically be around 1%. For example, a 25M aluminum alloy profile should be stretched approximately 25 cm after straightening, but this should not exceed 2%. Adjustments should be made based on the specific characteristics of the extruded profile, including opening size, surface quality, external dimensions, inner diameter, wall thickness, elongation, and other technical requirements. The goal is to balance conflicting demands while ensuring the profile meets all necessary specifications. Excessive stretching can cause head-to-tail size variations, surface distortion (such as fish-scale patterns), reduced elongation, increased hardness, and brittleness. On the other hand, insufficient stretching may result in low compressive strength, hardness, and even failure to achieve desired hardness during aging, leading to warping or "large knife bend" issues.
(6) To effectively control tensile deformation and maintain consistent dimensions throughout the profile, it's essential to use appropriate clamps and proper stretching methods. Special attention should be given to materials with openings, curved surfaces, cantilevered sections, or complex shapes. In some cases, it may be necessary to use centering devices or padding in the middle of the profile to ensure uniform stretching along the entire length, meeting all required specifications for the aluminum alloy profile.
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