1. Stretching must cool the aluminum alloy profile below 50 degrees before it can be moved to the stretching rack for stretching. Excessive temperature stretching will burn the human body and also burn the tops, and it cannot be completely eliminated. The internal stress of the aluminum alloy profile shows absolute waste products such as twists, twists, and poor functions before and after aging.
2. The stretching amount is controlled at 1%. The numerical control processing supplier should also pay attention to the head, middle and tail scale error if the stretching amount is too high, the appearance of water-like twist (fish scale) marks, 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 stress of small feet, thin teeth, long legs, arc surfaces, inclined surfaces, openings, viewpoints, etc. of profiles with high width-to-thickness ratios, long wall lengths, large arcs, large wall thicknesses, strange shapes In order to avoid the occurrence of defects such as deformation, twisting, and spiraling of the profile part or point-like 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 is not allowed to touch, pull, stack, jam, or entangle 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.