There are many kinds of aluminum and aluminum pipes. According to the difference in strength characteristics and processing performance, aluminum pipe extrusion methods are generally divided into three categories: pure aluminum, soft alloy and hard alloy 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, requires 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 die consumption is large, the cost is high, and the yield is low.
The 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 into hard things and prevent smashing. This requires strengthening the protection of products during production and lifting, and at the same time must be handled with care and protection. Surface, civilized production.
Aluminum and aluminium 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 required to be high. All surfaces in contact with the pipe should meet the process requirements.
Extrusion of aluminum and aluminum pipe, in addition to pure aluminum can not control the extrusion speed, the other alloy pipe has its own appropriate extrusion speed, production must be strictly controlled, therefore, should choose the speed adjustable extrusion machine.
Many aluminum and aluminum alloys are easily welded together at high temperatures and pressures, providing 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.
Perforated extrusion can be used under appropriate process conditions. During the perforation extrusion process, a complete metal sleeve is adhered to the inner surface of the commonly used extrusion barrel and the surface of the perforating pin. During operation, the metal sleeve should be kept clean and complete so as to produce high quality. The pipe. Otherwise it will deteriorate the quality of the inner and outer surfaces of the pipe, resulting in defects such as air bubbles, peeling and scratches.
In order to ensure the dimensional accuracy of the pipe, to reduce the wall thickness eccentricity, to prevent broken needles and damage other tools, the alignment of equipment and tools should be ensured as much as possible.
