Aluminum pipe is including a lot of types. According to its strength characteristics and processing performance, the extrusion methods of aluminum pipe are generally divided into three categories, pure aluminum, soft alloy and hard alloy pipe. Extrusion pure aluminum and soft alloy pipe are easier, with a requirement of high deformation and good surface. On the contrary, extrusion of the hard alloy pipe is more difficult because it asks that the relatively less deformation and greater equipment property, and besides, the surface is also prone to various defects. Therefore, for the hard alloy pipe, the technical operation has high requirements, processes are many and complicated, the production cycle is long, and mold consumes much more with high cost and lower yield.
Aluminum pipe requires high surface quality, but its hardness is low, especially in the hot state. So during the production and shipment, it should be very careful and can not bump hard things, which requires in the production and lifting, you should lift carefully and protect surface.
Aluminum pipe extrusion is prone to phenomenon of sticky aluminum, and it often happens to stick on the machine to cause the various defects in the pipe inside and the surface outside. Therefore, in the extrusion, in addition to the use of process lubrication, the surface finish and hardness of the machine are required strictly. All surfaces contacting with the pipe should meet the processing requirements.
Except that the pure aluminum has no requirement on the extrusion speed, the other pipes have its own appropriate extrusion speed requirement. So, you need to select the speed-adjustable extrusion machine.
Much aluminum is welded at high temperatures and pressures, giving favorable conditions for the production. For example: extrusion of the plane combining mold and the tongue mold takes the advantage of that to produce pipe. Not only has this enlarged the variety, specification and uses, but also you can extrude the pipe and the hollow profile with complex section with solid ingots on a conventional single-acting extruder.
At the appropriate process conditions, perforation extrusion can be used. During the perforation, the inner surface of the extruded cylinder and the surface of the perforated needle both are adhered to a completed metal sleeve which should be kept clean and completed in order to produce a high quality pipe. Otherwise it will deteriorate the pipe including the inner and outer, resulting in bubbles, peeling and scratches.
In order to ensure the dimensional accuracy of the pipe, you need to reduce the wall eccentricity to prevent from needle broken and machine damaged and try to ensure neutrality.
Aluminum pipe is not suitable for peeling and extrusion. The main reason is that the shell is destroyed and difficult to be removed.
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