Precision cutting and aluminum die-casting of skived fins heat sink machine

The definition of precision cutting is to use a precisely controlled special planer to cut a piece of metal profile with a specified thickness according to the needs, and then bend it upwards into an upright state to become a heat dissipation fin. In fact, a simpler way to understand is to cut a whole piece of metal into the shape of the heat sink that we usually see. This method is most common on the skived fins heat sink machine of pure copper.

The advantage of precision cutting is that the heat-absorbing bottom and the fins are integrally formed, the connection area (connection ratio) is large, there is no interface impedance, and the fins are thicker, which can more effectively use the heat dissipation surface area; in addition, the cut fins are densely arranged, A larger heat dissipation area can be obtained per unit volume. However, this method is affected by raw materials, and the yield rate is low; the slenderness ratio is insufficient; the distance between the films is short, the air passage space is small, and the wind resistance is large. And the production equipment and production costs are very high. This method is not very common now, but many blade servers use skived fins heat sink machines of this specification.

Aluminum die casting is a widely used single aluminum alloy processing technology. After the aluminum alloy ingot is melted into a liquid state, it is filled into the mold, and then die-casted by a die-casting machine at one time. After cooling and subsequent processing, a single heat sink is made.

The advantages of aluminum die-casting are: it is integrally formed without interface impedance; it can manufacture thin, dense or complex fins, which is easy to realize some special designs. Its significant shortcomings: the material's mechanical properties and thermal conductivity cannot be balanced; excessive surface flow and oxidized slag during die-casting will reduce the heat transfer effect; internal micro-shrinkage holes are higher during cooling, and the actual thermal conductivity is reduced; mold life is shorter, and equipment Relatively complex, with small output and slightly higher cost. In fact, most of the aluminum skived fins heat sink machine of this kind of process, the heat dissipation effect is still said in the past, the products manufactured have a certain price-performance ratio.