Causes of orange peel defects on the surface of aluminum profiles and the solutions

Sometimes the surface of the aluminum profile appears orange peel shape wrinkles after stretching In fact, this is the surface metal fragmentation (grain breakage) when the stress on the surface metal of the aluminum profile is greater than that on the base metal If the stress continues to be applied, the stress will be from the surface to the inside until the base metal fracture Causes of orange peel on the surface of aluminum profile: generally, the reason of orange peel on the surface of aluminum profile is that the drawing amount of aluminum profile is too large Generally speaking, the thicker the wall thickness is, the shorter the profile length is In order to ensure the straightness of the profile and prevent twisting, it is easier to increase the drawing amount artificially The methods to eliminate the orange peel defects on the surface of aluminum profiles are as follows: (1) the aluminum profiles which are easy to be bent and twisted should be repaired to control the straightness of aluminum profiles (II) increase the traction force when the aluminum extrusion is still hot, and take corrective measures (pay attention to prevent the deformation of the profiles) such as jacking and pressing on the discharging table for the hot profiles (III): control the tensile rate of the aluminum profile, and take the straightness into account to ensure the surface quality, and strictly control the curvature within the upper limit required by the customer when drawing (IV): control the drawing rate of aluminum profile In order to ensure the straightness and surface quality, cut off more deformation parts at both ends of profile drawing and stop printing.