Causes and solutions of pitting on the surface of aluminum profiles

by:Zeyi     2021-06-10
The pitting on the surface of the aluminum profile refers to the appearance of the surface of the aluminum profile with varying densities, tailings, and very small tumors, which have an obvious hand feeling and a sharp feeling.  Analysis of the main reason:   Because of the inclusions in the ingot or the metal or debris on the mold working belt, the aluminum profile manufacturer is entrained and peeled off by the high temperature and high pressure aluminum during extrusion, forming a pitted surface on the surface of the profile. Solution:   ①Appropriately reduce the extrusion speed, adopt reasonable extrusion temperature and mold temperature;   ②Strictly control the quality of the ingot, reduce the content of inclusions in the ingot, and homogenize the ingot;   ③Strengthen the quality management of mold repair .
Analysis of Causes of Orange Peel Defects on the Surface of Aluminum Profiles
The characteristics of orange peel defects on the surface of aluminum profiles reflect:    Sometimes orange peel-shaped wrinkles appear on the surface of aluminum profiles after stretching. In fact, this is the surface metal fragmentation (grain crushing) produced when the surface metal of the aluminum profile is stressed more than the base metal. , If you continue to apply force, the stress will go from the surface to the inside until the matrix breaks.  The cause of the orange peel defect on the surface of aluminum profile:   The reason for the orange peel defect on the surface of general aluminum profile is that the amount of stretch of the aluminum profile is too large when it is stretched. Generally speaking, the thicker the wall, the shorter the length of the profile. In order to ensure the straightness of the profile and prevent twisting, it is more likely to occur when the stretch is artificially increased.  The method to eliminate the defects of orange peel on the surface of aluminum profile:   (1), strengthen the mold for the flexible and twisted aluminum profile, and control the straightness of the aluminum profile. (2) Increase the traction when the aluminum extrusion is still hot, and use corrective measures such as topping and pressing on the hot profile on the discharge table (pay attention to prevent deformation of the profile)    (3), control the stretch rate of the aluminum profile, In order to ensure the surface quality and take into account the straightness, the bending degree is strictly controlled within the upper limit required by the customer during stretching.   (four), control the stretch rate of aluminum profile, in order to ensure the straightness while taking into account the surface quality, more cut off the deformation at both ends of the profile stretch and the stop printing.
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