1, tensile must be in the aluminum alloy profile cooling to 50 degrees below can be moved to the tensile frame for stretching operation, the temperature is too high that stretching will not only burn the human body, hot strip, but also because it can not completely eliminate the internal stress of aluminum alloy profile before and after the aging present twists, twists, poor function and other absolute waste products.
2, the amount of tensile control at the mercy of 1%, and pay attention to the excessive amount of tensile will occur in the head of the tail scale error, the surface of the water grain twist (fish scale) marks, low elongation, high hardness brittle (low plasticity). Too low tensile amount will make the compressive strength and hardness of the profile is low, and even aging (quenching) can not improve the hardness, the profile is easy to curved (commonly known as large knife bend).
3, in order to control the tensile deformation and very good control of the size change of the whole section, to choose the appropriate special clamping pad and appropriate methods. In particular, the opening material, the arc material, the cantilever material, and the curved shape of the profile should pay more attention to the reasonable and useful use of the tensile clamping pad.
4, pay attention to the width and thickness ratio of high, long wall, large arc, wall thickness disparity, strange shape and other profiles of small feet, thin teeth, long legs, circular surface, inclined plane, opening, view and other mechanical conditions, avoid the profile part or point scale deformation, twisting, spiral and other shortcomings.
5, because the wool has the effect of heat resistance, the aluminum profile with high decorative appearance demand must be turned more up and down before and after, so as to evenly heat dissipation, reduce the transverse bright spot shortcomings caused by uneven heat dissipation and crystallisation, especially the large and wide surface, the wall thickness of aluminum profile should pay more attention to.
6, in the process of taking material and moving and stretching shall not rub, pull, stack, jam, intertwine with each other, should be reserved between each other a certain interval. The easy twists and turns, the length of the aluminum alloy profiles should be disposed of in time, and the maintenance and disposal of each other should be made when necessary.
