Pay attention to the stretching process of aluminum shell


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 absolute waste products such as twists, twists, and malfunctions 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 stretching amount will lower the compressive strength and hardness of the profile, and even the aging (quenching) will not increase 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, appropriate special pads and appropriate methods must be selected. 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 ratio, long overhangs, large arcs, large and thin wall thicknesses, 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 tops have 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. In the process of reclaiming, moving and stretching, it should not be rubbed, pulled, stacked, congested, or entangled with each other, 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, they should be maintained and disposed of.