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How to produce aluminum heat sink with good heat dissipation effect?

Dec. 10, 2019

Aluminum heat sinks are widely used in electronics, electrical appliances, lighting and other industries as a cooling tool with high heat dissipation efficiency. However, different aluminum profile heat sink manufacturers have different technical processes and different reference production standards. The aluminum profile custom heat sinks produced will also have advantages and disadvantages in terms of heat dissipation. So how can heat sink manufacturers produce aluminum heat sinks with good heat dissipation? Let ’s share the experience and tell you how to produce aluminum heat sinks with good heat dissipation.

First, the bottom design of the heat sink

Many people think that a piece of fin is the key to heat dissipation when contacting an aluminum heat sink. In fact, the bottom heat sink is also a part that cannot be ignored when dissipating heat. The design of aluminum profile heat sinks should adhere to the principle of gradually thinning the heat source part to both sides. This is to ensure that the heat absorbed by the heat source part can be quickly transferred to the surrounding thin part to achieve high efficiency heat dissipation. If the design of the bottom heat sink is flat, it is difficult to spread the heat from the heat source, which will affect the heat sink's further absorption of heat from the heat source.

Aluminum Heat Sink

Aluminum Heat Sink

Second, the heat sink fin design

The design of the heat sink in the shape of a fin is not only to increase the contact area with the heat source to absorb more heat, but also to increase the contact area of the heat sink to the air so that the heat can be dissipated into the air faster. The overall area of the heat sink is limited. The more fins, there is indeed a larger contact area to absorb more heat, but this also means that the spacing between the fins becomes more. Small, at this time the air flow speed in each channel becomes smaller, and it becomes more difficult for the heat sink to dissipate heat into the air. If the fins become thicker, the number of corresponding fins will decrease, and the heat absorption will not necessarily increase. Therefore, when manufacturers are manufacturing aluminum heat sinks, the design of the fins must be reasonably and precisely calculated according to demand, and produced in strict accordance with the plan. Only in this way can the finished product fully meet the heat dissipation requirements.

Third, the aluminum extrusion technique

The heat sink must have extremely high requirements in shape design and dimensional accuracy, and the heat sink must be error-free during the molding process to achieve the expected heat dissipation effect, and here is The help of aluminum extrusion technology is indispensable. Aluminum extrusion molding is a method of processing parts by applying strong pressure on the aluminum alloy material placed in the mold cavity to cause directional deformation of the aluminum alloy to obtain the required cross-sectional shape, size and certain mechanical properties. The aluminum extrusion heat sink uses aluminum extrusion molding technology to achieve high precision of the finished product, good surface quality, and stable overall structure to ensure the qualification rate of the product. Traditional welding technology cannot achieve such a good effect. Not only is it difficult to meet the requirements in terms of accuracy, but also the welding is prone to corrosion and affects the stability of the overall structure.

Fourth, anodizing process

The factors that affect the heat dissipation effect of aluminum profile heat sinks are not only the heat sink area, shape, and convection area with air, but also the heat radiation capacity is a part that cannot be ignored. Radiative heat dissipation is a method of radiating infrared radiation from the surface of a higher temperature object and receiving heat from the surface of a lower temperature object. The aluminum profileheat sink uses radiant heat to transfer the high heat from the heat source to the lower temperature, achieving equilibrium The effect of heat dissipation to improve heat dissipation performance. The ordinary aluminum profile heat sink does not have a good effect on radiation heat dissipation, and anodizing is used to form an oxide film on the surface of the aluminum profile heat sink to enhance the heat radiation ability of the heat sink, so that the heat dissipation effect of the heat sink can be more outstanding.

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