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The reason why air is generated inside the extruded aluminum

Update:27-11-2017
Summary:

The use of an aluminum extrusion press to compress the […]

The use of an aluminum extrusion press to compress the aluminum profile leaves air trapped inside it, causing air bubbles in the interior and exterior of the aluminum profile, resulting in defects that can not be fully resolved, making the aluminum profile a waste material. To prevent air from entering the aluminum profile, be sure to find out why the air is being carried. The main factors that left the air inside the extruded aluminum include:
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A long stick heat cut caused the air to remain
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The shearing surface formed by the hot shearing of long rods is absolutely not perfect. The simple hot shearing of long rods by vertical industrial aluminum profiles can cause the bending of the rods to be very serious, resulting in an oval cross section of the aluminum profile And was cut a very large round. Even the latest hot rod cutters, the angle of the edge of the cut bar is always rounded, these rounding is the best place to air residue.
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2 Upsetting caused the air to remain
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Only when the diameter of the cylinder containing the aluminum ingot is larger than the diameter of the rod. The rod was enough to be put into the cylinder containing the aluminum ingot. After pressure has been applied to the rod in the cylinder containing the ingot, the rod must be vented after it has been expanded to the diameter of the rod. Gas is not discharged in, and the remaining aluminum ingot will eventually become bubbles.
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3 As a result of the two aluminum rods connected to the air caused by the residue
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Because the surface of two stub rods is essentially flat, the probability of carrying in the air is very small. The quality of sawing interferes directly with the amount of air carried between the two stub rods. Currently there is a high technology to prevent the two short bar phase. Eliminate the possibility of air entering.

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