Aluminum profile heat sink is currently a common type of profile heat sink, with its unique manufacturing process of aluminum profiles. So far, aluminum profile heat sinks still occupy a considerable portion of the market. To increase the heat dissipation area of its fins, the commonly used aluminum profile processing method for pure aluminum profile radiators is aluminum extrusion technology, and the main indicators for evaluating a pure aluminum profile radiator are the thickness of the radiator base and the pin in ratio. Pin refers to the height of the fins of the heat sink, while fin refers to the distance between adjacent fins. The pin in ratio is calculated by dividing the height of the pin (excluding the thickness of the base) by fin. A higher pin in ratio means a larger effective heat dissipation area of the radiator, indicating a more advanced aluminum extrusion technology.

The processing and forming technology of commonly used aluminum profile radiators

From some perspectives, the processing and forming technology of aluminum profile radiators determines the performance of aluminum profile radiators, and is also an important manifestation of the technical strength of aluminum profile manufacturers. At present, the mainstream forming technologies for radiators mainly include the following categories:

Aluminum extrusion technology (extruded)

Aluminum extrusion technology simply means heating the aluminum ingot at a high temperature of about 520-540 ℃, allowing the aluminum liquid to flow through the extrusion mold with grooves under high pressure to create the initial heat sink, and then cutting and grooving the initial heat sink to create the commonly used heat sink. Aluminum extrusion technology is relatively easy to implement and has relatively low equipment costs, which has also made it widely used in the low-end market in previous years. The commonly used aluminum extrusion material is aa6063, which has good thermal conductivity (about 160-180 w/m. k) and processability. However, due to the limitations of its own material, the ratio of thickness to length of the heat dissipation fins cannot exceed 1:18, making it difficult to increase the heat dissipation area in limited space. Therefore, the heat dissipation effect of aluminum extruded heat dissipation fins is relatively poor, making it difficult to cope with the increasing frequency of CPUs today.

Aluminum die-casting technology

In addition to aluminum extrusion technology, another commonly used process method for manufacturing heat dissipation fins is aluminum die-casting. By melting aluminum ingots into a liquid state, filling them into a metal model, and using a die-casting machine to directly mold them, heat dissipation fins can be made into various three-dimensional shapes using the die-casting method. The heat dissipation fins can be made into complex shapes according to needs, and can also be combined with fans and airflow directions to create heat dissipation fins with guiding effects, And it can make thin and dense fins to increase the heat dissipation area, which is widely adopted due to its simple process. The commonly used die-casting aluminum alloy is adc12. Due to its good formability, it is suitable for making thin castings. However, due to its poor thermal conductivity (about 96 w/m.k), aa1070 aluminum is now widely used as the die-casting material for aluminum profiles in China, with a thermal conductivity of around 200 w/m.k, which has good heat dissipation effect.

In addition, the main program that may be used in the production of aluminum profile radiators is melting casting, which is mainly achieved by:

1. Ingredients: Calculate the addition amount of various alloy components based on the specific alloy grade that needs to be produced, and reasonably match various raw materials.

2. Melting: Add the prepared raw materials to the smelting furnace according to the process requirements for melting, and effectively remove impurities and gases from the melt through degassing and slag refining methods.

3. Casting: Under certain casting process conditions, the melted aluminum liquid is cooled and cast into various specifications of round cast rods and aluminum profiles through a deep well casting system, and then processed into aluminum profile radiators.