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Aluminum Machinability Rating

Aluminum Machinability Rating
Aluminum Machinability Rating There are many types of aluminum products, such as plates, sheets, foils, extrusions, rods, wires, etc., the definition of aluminum rolling quality “aluminum billets are manufactured into flat products by heating, hot rolling, cold rolling, heat treatment and other processes. “Form” can be in the shape of a plate, sheet, or foil. The product categories of aluminum rolled products are mainly distinguished by thickness, according to the regulations of the Aluminum Association as follows:
  1. Aluminum plate: thickness 6.35 (inclusive) mm or more
  2. Aluminum sheet: 0.15-6.35mm flat sheet and roll sheet
  3. Aluminum foil: thickness 0.15 (not included) mm or less
Aluminum alloys can be divided into work-hardening and heat-treated alloys according to their different strengthening methods. Among them, work-hardening alloys mainly rely on work-hardening to achieve strength requirements, while thermal Treated alloys rely on the solid solution or precipitation of the added alloys to achieve strength requirements. Generally speaking, the strength of heat-treated alloys is higher than that of work-hardened alloys, and the applications of the two are also different.
  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), soft alloys (3XXX, 5XXX, 6XXX) and Three types of hard alloy (2XXX, 4XXX, 7XXX) pipes. The extrusion of pure aluminum and soft alloy pipes is relatively easy, the deformation is large, and the surface is also good. On the contrary, the extrusion of hard alloy pipes is more difficult, the deformation should not be too large, it requires large equipment capacity, and various defects are prone to appear on the surface. Therefore, the technical requirements for operation are relatively high, the processes are numerous, the production cycle is long, the consumption of tools and molds is large, the cost is high, and the yield is low.
  2. The surface quality requirements of aluminum and aluminum alloy pipes are relatively high, but their hardness is not high, especially in the hot state. Therefore, great attention should be paid to the production and shipping process, and hard objects should not be bumped to prevent bumps. This requires strengthening the protection of the product during production and lifting, and at the same time, it must be handled with care and protection during work. Surface, civilized production.
  3. Aluminum and aluminum alloy pipes are prone to sticking to aluminum during extrusion, and they often stick to the tool locally, causing 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, and all surfaces in contact with the pipe should meet the process requirements.
  4. When extruding aluminum and aluminum alloy pipes, in addition to pure aluminum, the extrusion speed can not be controlled, and other alloy pipes have their own appropriate extrusion speeds, which must be strictly controlled during production. Therefore, the speed can be selected. Adjusted 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 dies and tongue die extrusion take advantage of this feature to produce pipes. This not only expands the varieties, specifications and uses of pipes, but also can use solid ingots to extrude pipes and complex cross-section hollow profiles on ordinary single-action extruders.
  6. Under appropriate process conditions, perforation extrusion can be used. In the process of perforation and extrusion, a complete metal sleeve is generally adhered to the inner surface of the used extrusion cylinder (extrusion without lubrication) and the surface of the perforation needle. This layer of metal sleeve should be kept clean and complete during operation. , in order to produce high-quality pipes. Otherwise, the quality of the inner and outer surfaces of the pipe will be deteriorated, and defects such as bubbles, peeling and scratches will be generated.
  7. In order to ensure the dimensional accuracy of the pipe, reduce the eccentricity of wall thickness, and prevent needle breakage and damage to other tools, the alignment of equipment and tools should be ensured as much as possible.
  8. Aluminum and aluminum alloy pipes are not suitable for production by peeling extrusion method. The main reason is that the shell that comes out is damaged and difficult to remove.

The Basic Characteristics Of Aluminum And Aluminum Alloys

  1. Light weight: The proportion of aluminum is only one-third of that of steel, and it plays an important role in the lightweight of transportation tools, such as bicycles, car bodies, etc.
  2. Corrosion resistance: A thin oxide film formed on the surface of aluminum in the natural environment can block oxygen in the air and avoid further oxidation. It has excellent corrosion resistance. If the aluminum surface is subjected to various surface treatments, its corrosion resistance It has better performance and can be used outdoors and in harsh environments.
  3. Formability: Fully annealed (or partially annealed) can produce soft aluminum alloys, which are suitable for various forming aluminum machining requirements, such as aluminum rims, ceiling recessed lamp shades, capacitor peripherals, aluminum pots, etc.
  4. Strength: Using the alloy addition, rolling and heat treatment process, it can produce products with different strength grades from 2kg/mm2 to 60 kg/mm2, so as to adapt to products with different strength requirements.
  5. Surface treatment: Aluminum has excellent surface treatment, including anode treatment, surface chemical treatment, coating and electroplating, etc. In particular, anode treatment can produce films of various colors and hardness to suit various purposes.
  6. Conductivity: The conductivity of aluminum is 60% of that of copper, but its weight is only one-third of that of copper. The same weight of aluminum has twice the conductivity of copper, so if measured with the same conductivity, aluminum The cost of copper is much cheaper than copper, and this application is such as electrical wires.
  7. Thermal conductivity: Aluminum has excellent thermal conductivity, so it is widely used in home hardware, air conditioner fins, heat exchangers, etc.
  8. Processability: Aluminum has excellent processability and can be processed into rods, wires, and extruded profiles for various purposes. In particular, aluminum has good extrudability, and extruded profiles account for a large proportion of aluminum.
  9. Weldability: Pure aluminum and aluminum-magnesium alloys have good weldability and play an important role in the application of structures and ships.
  10. No low temperature brittleness: Aluminum does not have the low temperature brittleness problem of ordinary carbon steel in the state of ultra-low temperature, and can be applied to low temperature equipment, ships, etc.
  11. Non-toxic: Aluminum is not toxic and is widely used in food applications, such as food packaging bags, instant food containers and household hardware. The most important use of aluminum foil is food packaging.
  12. Recyclability: Although the price of aluminum is higher than that of ordinary carbon steel, it is easy to be recycled and remelted, and it is a resource that can be fully and effectively used on the earth.

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