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What are the 3 Main Factors that Cause the Residual Air in the Aluminum Ingot to be Squeezed?

02. 28, 2020

Extrusion is an inevitable step in the processing of aluminum ingots, but sometimes air remains in the Aluminum Ingot. What causes this? Let Aluminum Alloy Ingot Supplier tell you:

6063 Aluminum Bar

6063 Aluminum Bar

A. Hot shearing of long rods leads to residual air: The shear surface formed during hot shearing of long rods will never be perfect. Simple vertical hot shearing of vertical industrial Dongguan aluminum ingots will The bending was very serious, resulting in an oval cross section of the Dongguan aluminum ingot and a very large rounded corner that was cut off. Even with the latest type of long-bar hot shear, the angle of the edge of the bar being cut always produces rounds, and these rounds are the best place for air residue.

B. Upsetting results in residual air: Only when the diameter of the cylinder containing the aluminum ingot is larger than the diameter of the rod. Only the rods are enough to be placed in a cylinder containing aluminum ingots. After pressure is applied to the rods in the aluminum ingot cylinder, which causes the rods to expand to the diameter of the ingot cylinder, the gas carried in must be discharged. The gas does not come in, and it remains in the aluminum ingot and eventually turns into a bubble.

C. The contact of the two aluminum rods leads to residual air: because the surface of the two short-column rods is basically flat, the probability of carrying the air in is very small. The quality of the sawing directly interferes with the amount of air carried between the two short rods. At present, there is a new and high technology that can prevent two short rods from being connected. Proceed to eliminate the possibility of air ingress.

After finding the reason, we can find the answer from it. In order to reduce the trouble, it is recommended that everyone pay attention to every detail when producing.

Die-casting aluminum ingots should be purified before casting, because primary aluminum contains many other elements, which must be purified. The industry mainly uses clarification, flux, gas and other purification methods, and some use directional solidification and filtration methods. Purification.

Flux purification. Flux purification is to use the flux added to the aluminum liquid to form a large number of fine droplets, so that the oxides in the aluminum liquid are wetted, adsorbed and dissolved by these droplets, and a new droplet is formed on the surface. After cooling, scum is formed and removed.

The purifying flux is composed of a salt having a low melting point, a small density, a small surface tension, a high activity, and a strong adsorption capacity for oxide slag. When using, first put a small piece of flux into the iron cage, and then insert it into the bottom of the mixing furnace to stir back and forth. After the flux is finished, remove the iron cage and let it stand for 5-10 minutes. Remove the surface scum and cast. The flux can also be removed to cover the surface as required.

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