ã€China Aluminum Industry Network】 (1) Aluminium alloy profiles must not be rubbed, pulled, stacked, congested, and entangled in the process of reclaiming, moving, and stretching. A certain interval should be reserved for each other. For easy twists and turns, the length of the aluminum alloy profiles to be discharged should be promptly disposed of, and if necessary, they should be properly maintained.
(2) Stretching of aluminum alloy profiles must be carried out on aluminum alloy profiles cooled to less than 50 degrees (naked hands can be gripped) before being moved to a stretching frame for stretching. , Burned tops, but also because it can not completely eliminate the internal stress of aluminum alloy profiles before and after the aging presents twists and turns, twisting, dysfunction and other waste products.
(3) As the tops have the effect of blocking heat, the aluminum profiles with high demand for decorative appearance must be turned up and down, so as to facilitate uniform heat dissipation, and reduce the disadvantages of horizontal bright spots due to uneven heat dissipation and unevenness, especially large Wide, thick aluminum profiles should pay attention.
(4) Attention should be paid to the small feet, thin teeth, long legs, arc surfaces, inclined surfaces, openings, viewpoints, etc. of profiles that have high aspect ratios, long hanging walls, large arcs, large and narrow wall thicknesses, and strange shapes. The force condition avoids the occurrence of shortcomings such as deformation of sections or point-like scales, twisting, and spirals.
(5) The manipulation of the stretching amount is controlled at 1%. For example, the 25M aluminum alloy section stretching amount should be stretched by 25CM after being straightened, but it must not exceed 2%. The production should be adjusted according to the actual situation of aluminum kneading profiles discharging and various specific requirements (opening scale, appearance quality, appearance scale, inner diameter scale, wall thickness thickness, elongation, etc.), and seeking to meet the needs of the opposing skills. At the same time satisfied with the specific needs of the amount of stretching. Excessive stretching results in head-to-tail tail size errors, appearance of water-lined twist (fish scale) marks, low elongation, and high hardness and brittleness (low plasticity). Too low tensile strength will result in low compressive strength and hardness of the profile, and even the aging (quenching) will not increase the hardness. Profiles are easy to bend and bend (commonly known as large knife bends).
(6) In order to manipulate the amount of tensile deformation and to control the dimensional change of the entire profile, appropriate special clamps and suitable methods should be used. In particular, opening material, circular arc material, cantilever material, and zigzag-shaped profiles should pay attention to the reasonable and useful application of the tensile pad. If necessary, the center of the stretching profile should be controlled by a righting or stuffing pad to ensure that the length between the ends of the head and the tail meets the requirements of the aluminum alloy profile.
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