[China Aluminum Industry Network] (1) There are many types of aluminum and aluminum alloy pipes. According to their strength characteristics and processing performance differences, aluminum alloy pipe extrusion methods are generally divided into pure aluminum (1XXX) and soft alloy (3XXX). , 5XXX, 6XXX) and hard alloy (2XXX, 4XXX, 7XXX) three major categories of pipe. The extrusion of pure aluminum and soft alloy pipes is easy, the deformation is large, and the surface is also good. On the contrary, hard alloy pipe extrusion is more difficult, the amount of deformation should not be too large, the need for greater equipment capabilities, the surface is also prone to various defects. Therefore, the technical requirements for operation are high, the processes are numerous, the production cycle is long, the tooling and mold consumption is large, the cost is high, and the yield is low.
(2) Aluminum and aluminum alloy pipes require high surface quality, but their hardness is not high, especially under hot conditions. Therefore, great care must be taken in the production and shipping process. It is not possible to bump hard things and prevent smashing. This requires strengthening the protection of products during production and lifting, and must be handled with care and protection. Surface, civilized production.
(3) Aluminum and aluminum alloy pipes are prone to sticking aluminum when they are extruded. They often stick to the tool locally and cause various defects on the inner and outer surfaces of the pipe. Therefore, in addition to the use of process lubrication during extrusion, the surface finish and surface hardness of the tool are all required to be high, and all surfaces in contact with the pipe should meet the process requirements.
(4) Extrusion of aluminum and aluminum alloy pipes, in addition to pure aluminum can not control the extrusion speed, the other alloy pipes have their own appropriate extrusion speed, production must be strictly controlled, therefore, should choose the speed can be Adjust the extruder.
(5) Many aluminum and aluminum alloys are easily welded together under high temperature and pressure, which brings favorable conditions for the production of pipes. For example: flat combination die and tongue die extrusion use this feature to produce pipes. This not only expands the variety, size, and application of the pipe, but also uses solid ingots on ordinary single-acting extruders to extrude pipes and complex section hollow profiles.
(6) Under the appropriate process conditions, perforated extrusion can be used. During the perforation extrusion process, a complete metal sleeve is adhered to the inner surface of the commonly used extrusion barrel (not lubricating and extrusion) and the surface of the perforating pin. During operation, the metal sleeve should be kept clean and complete. In order to produce high quality pipes. Otherwise it will deteriorate the quality of the inner and outer surface of the pipe, resulting in defects such as air bubbles, peeling and scratches.
(7) In order to ensure the dimensional accuracy of the pipe, reduce the wall thickness eccentricity, prevent broken needles and damage other tools, we should try to ensure the neutrality of equipment and tools.
(8) Aluminum and aluminum alloy pipes are not suitable for peeling and extrusion methods for production. The main reason is that the shell removed has been damaged and it is difficult to remove it.
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