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Why does industrial aluminum extrusion produce bubbles?

2018-04-14 00:00:21

Sometimes you will find that there are some bubbles on the surface or inside of industrial aluminum profiles, and these bubbles are produced when industrial extrusion, and the retention of these bubbles makes the product not so beautiful, but also allows customers to purchase the product has a certain influence. So how do we prevent the formation of bubbles? Then it is recommended that you first understand how the air goes in.


Air residue in the extrusion cylinder. Because the diameter of the aluminum rod is smaller than the diameter of the extrusion cylinder, the pressure needs to be applied to the aluminum rod during extrusion, the aluminum rod will be upset until the entire extrusion cylinder is filled, at this time if the air is not all out of the air will be squeezed into the aluminum rod, and the extrusion aluminum will form bubbles.


Air residue from the hot shear furnace. As we all know, aluminum extrusion generally needs to cooperate with the hot shear furnace to cut the heated aluminum rod into a short rod and then send it to the extrusion machine. If the aluminum rod is heated to the critical point, the section deformation will be more severe when cutting, especially the edge part is particularly easy to retain air.


Improper oiling causes air retention.


Unreasonable mold design.


Air residue forms at the joint of two aluminum rods. Generally, the shear surface of aluminum rods is not very flat, and they are easy to carry air into the joint, which will cause bubbles in industrial aluminum profiles.


Excess pressure is too thin. In order to save materials, the final margin of the aluminum rod is left too little during extrusion, so that the metal in the die shunt hole is pulled out during shearing, so that there is a gap in the shunt hole.

Matters needing attention

When using extruded aluminum profiles, remember to pay attention to personal safety.