What are the precautions during the stretching process of aluminum profiles?

by:Zeyi     2021-07-10
1. Stretching must be done when the aluminum alloy profile is cooled to below 50 degrees before it can be moved to the stretching rack for stretching. If the temperature is too high, stretching will not only burn the human body, burn the top, but also because the aluminum cannot be completely eliminated. The internal stress of the alloy profile shows tortuous, twisted, malfunctioning and other absolute waste products before and after aging.  2. The stretching amount is controlled at 1%, and it should be noted that if the stretching amount is too high, head, middle and tail scale errors will occur, water-like twists (fish scales) marks on the surface, low elongation, high hardness and brittleness (low plasticity). Too low a stretch will make the compression strength and hardness of the profile lower, and even the aging (quenching) will not improve the hardness, and the profile is prone to bends (commonly known as big knife bends).  3. In order to control the amount of tensile deformation and very well control the dimensional changes of the entire profile, it is necessary to select suitable special pads and suitable methods. Especially for open material, circular arc material, cantilever material, and zigzag-shaped profiles, more attention should be paid to the reasonable and useful use of stretch clamps. 4. Pay attention to the force of small feet, thin teeth, long legs, arc surfaces, inclined surfaces, openings, viewpoints, etc. of profiles with high width-to-thickness ratios, long overhangs, large arcs, large differences in wall thickness, strange shapes, etc. In order to avoid the occurrence of defects such as deformation, twisting and spiraling of the profile part or point scale. 5. Because the top has the effect of heat resistance, the aluminum profiles with high decorative appearance must be flipped up and down to facilitate uniform heat dissipation and reduce the shortcomings of lateral bright spots that occur due to uneven heat dissipation and crystallinity, especially for large widths. On the surface, thicker aluminum profiles should be paid more attention.  6. u200bu200bDo not rub, pull, stack, jam, or entangle each other in the process of reclaiming, moving and stretching, and a certain interval should be reserved between each other. The aluminum alloy profiles that are prone to twists and turns and the length of the discharge should be disposed of in time, and if necessary, take care of each other's maintenance.
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