Manufacturing process characteristics of Aluminum Heat sink
The role of Aluminum Heat sink is to dissipate the heat of electronic product components, which is the value of its existence, so it is necessary to focus on this point in production and operation both in design and use. For Aluminum Heat sink to have a good heat dissipation effect, the manufacturing process is the key. Today's Aluminum Heat sink production process includes cutting, extrusion, stamping, die-casting and other technologies as the core, deriving more than a dozen specific manufacturing processes, their advantages and disadvantages are obvious, and there are details. Can tell. Here is a brief introduction to the manufacturing process characteristics of Aluminum Heat sink.
1. Cutting and aluminum extrusion
Strictly speaking, cutting is an abbreviation for a large class of manufacturing processes, but they have one thing in common with machine tools such as turning, drilling, milling, and grinding. During the forming process of the Aluminum Heat sink, in order to obtain some more special and fine shapes, All need to use cutting technology. Mainly used for sheet metal forming, radiator slotting, engraving of special lines, etc. The base of the Aluminum Heat sink is made by an obvious cutting process, and the plane, edges and corners and the logos of some manufacturers are all processed by the cutting process. The advantage of the cutting process is its wide range of uses, but the disadvantage is the equipment, mainly the tool wears quickly, most of which require manual participation or automatic control, and the cost is high. The Aluminum Heat sink extrusion process is to heat the original aluminum ingot to about 520~540℃, use mechanical pressure to make the aluminum liquid flow through the extrusion die made of die steel, and cool the aluminum liquid at the exit of the die. Make it solidify quickly and become the initial embryo of the heat sink with a continuous parallel structure. After cutting the initial embryo, you can see our common Aluminum Heat sink.
2. Aluminum die casting
The die-casting process of Aluminum Heat sink is a widely used single aluminum alloy processing process. After the aluminum alloy original ingot is melted into a liquid state, it is filled into the mold, and the die-casting machine is used for one-time die-casting. After cooling and subsequent processing, a single Aluminum Heat sink is made. The advantage of the Aluminum Heat sink die-casting process is that it is formed in one piece and has no interface impedance; it can produce thin, dense or complex fins, and it 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 Heat sinks of this kind of process have good heat dissipation effect, and the products manufactured have a certain price-performance ratio.
3. Folding and welding are the mainstream
The dense and thin Aluminum Heat sinks we have seen are all made by this process. When forming, there is a small section of specially designed protruding part remaining on the edge of the fin. The fin is fixed in a customized mold, and the protruding part is bent and locked with each other to form a neatly arranged parallel fin. Combined with stamping, it is mainly used to manufacture parallel dense thin fins used in reflow soldering or air duct design. The folding method has obvious advantages, such as a simple mechanical locking structure and fewer processes; it can compensate for the interface impedance generated by the subsequent connection of the fin and the heat sink. A large amount of output can be achieved with a one-time equipment input. Many Aluminum Heat sink connections on the market now use this method, which is stable and simple. The heat dissipation form of welding is a familiar metal processing method. The commonly used soldering method in Aluminum Heat sink processing is reflow soldering, also known as reflow soldering. Because the degree of bonding at the welding point directly affects the heat dissipation effect, the cost of welding is higher.
4. Various heat sink process forms
In fact, in addition to the above-mentioned Aluminum Heat sink process forms, like we can often see heat sink processes such as forging and gear shaping. These processes have become less and less due to cost or heat dissipation reasons, but these are still Contributed to the development of Aluminum Heat sink manufacturing process.
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