What is the reason for the surface peeling of the aluminum profile shell?

When the aluminum extruder is pressurized, there will be residual air in the aluminum profile, and the aluminum profile will lead to bubbles in the interior and surface of the aluminum profile, which can not be completely solved, making the aluminum profile become waste. In order to avoid air into the aluminum, it is important to find out why air is brought in. The following are four main factors of residual air in extruded aluminum profiles:

1. Residual air caused by long rod thermal shear

The shear plane formed during hot shear of the rod is never perfect and vertical. The simple thermal shearing of industrial aluminum profile will make the bending of the rod very serious, resulting in the elliptic cross section of the aluminum profile and the huge fillet of the shear end. Even with the latest type of long rod shear, the Angle of the edge of the rod to be cut will always create a circle, and these circles are the best places for air to remain.

Solution: Standard inspection of aluminum bars, resolutely put an end to unqualified aluminum bars.

Upsetting results in the retention of air

Upsetting results in the retention of air. Only when the diameter of the cylinder containing aluminum ingots is larger than the diameter of the rod can the rod be put into the cylinder containing aluminum ingots. The aluminum profile exerts pressure on the rod inside the aluminum ingot barrel, causing the rod to expand to the diameter of the ingot barrel, and must discharge the gas carried. The gas is not discharged and remains inside the ingots, eventually becoming bubbles.

Solution: according to the minimum size of the extrusion cylinder liner to configure the extrusion gasket, regular replacement of the extrusion cylinder, the extrusion cylinder, the extrusion pad corrosion wash inspection, measurement of the extrusion cylinder, the extrusion pad inside and outside diameter size to configure the appropriate extrusion gasket; Clean the extrusion cylinder with cleaning gasket once per shift, and wash the extrusion cylinder regularly

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