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What is aluminum extrusion technology

Time:2020-09-27 Source:未知 Click:time

(a) : The aluminum profiles on the cooling bed shall not rub against each other, pull, overlap, squeeze and twist together in the process of material taking and moving and stretching, and a certain interval shall be reserved between each other. Easy to bend, the length of the material should be handled in a timely manner, when necessary to do the protection of each other.
(two) : the profile stretch must be cooled to 50 degrees below (naked hand can grasp) can be moved to the drawing frame for stretching work, the temperature is too high that stretch will burn the human body, hot broken wool, but also because can not completely eliminate the internal stress of the profile before and after aging appeared bending, twisting, poor performance and other absolute waste.
(three) : because of the hair has heat emission resistance role, decorative surface requirements of the profile must be more up and down to flip back and forth, in order to heat uniform, reduce heat uneven crystallinism and thus produced transverse bright spot defects, especially the large wide surface, wall partial thickness profile should pay more attention.
(4) : pay attention to the stress conditions of small feet, thin teeth, long legs, arc surface, inclined surface, opening, Angle and other profiles with high width to thickness ratio, long suspension wall, large radian, large wall thickness and strange shape, to prevent local or point size deformation, twist, screw and other defects.
(5): The stretching amount should be controlled at about 1%. For example, the stretching amount of 25M sections should be stretched around 25CM after straightening the section, but it must not exceed 2%. In production, it should be adjusted according to the actual conditions of profile discharge and various specific requirements (opening size, surface quality, external size, inner diameter size, wall thickness size, elongation, etc.), so as to find the tensile quantity that can meet various specific requirements at the same time in the contradictory technical requirements. Excessive tensile will result in the deviation of head and tail size, water grain (fish scale) marks on the surface, low elongation, high hardness and brittle (low plasticity). Too low tensile will make the profile compressive strength and hardness on the low side, and even aging (quenching) can not improve the hardness, profile easy arc bending (commonly known as machete bend).
(vi): In order to control the amount of tensile deformation and better control the size change of the entire section, appropriate special clamp pad and appropriate methods should be adopted. Especially open material, arc material, cantilever material, as well as curved shape profile should pay more attention to the reasonable and effective use of stretch clamp. When it is necessary to stretch the middle of the profile should be held upright or pad to ensure that the stretching size between the middle and the end of the section meet the profile requirements.

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