The manufacturing process of the heat sink is generally divided into: aluminum extrusion, aluminum casting, CNC machining aluminum, copper cutting, aluminum and copper stamping fins, copper inlaid heat sink, aluminum and copper embedded heat sink.
Aluminum extruded heat sink
This is an excellent heat sink material widely used in modern heat dissipation. Most of the industry uses 6063 T5 high-quality aluminum, whose purity can reach more than 98%. It has strong thermal conductivity, low density and low price, so it has been favored by major manufacturers. Based on the thermal resistance of Intel and AMD CPUs and the consideration of their heat generation, aluminum extrusion manufacturers formulate corresponding molds. Heat the aluminum ingot to a certain temperature to change its physical shape, and then extrude it from the extrusion die to obtain the various heat sink profiles we want; After CNC cutting, grooving, grinding, deburring, cleaning, and surface treatment, the heat sink can be used.
Although the price of aluminum extruded heat sink is low, the manufacturing cost is also low, but due to the limitation of the soft texture of aluminum itself, the ratio of the thickness of the aluminum fin to the height of the fin generally does not exceed 1:18. Therefore, under the requirement of increasing heat dissipation area and constant heat dissipation space, PC manufacturers have proposed a more suitable solution: Encrypted aluminum fins, thereby increasing the number of aluminum fins; Bending aluminum fins to increase the heat dissipation area; Heating the aluminum ingot from a solid state to a liquid state, passing it through a mold, and then cooling it becomes the desired heat sink.
Aluminum CNC cutting heat sink
Although the die-cast heat sink solves the effect that this aluminum extrusion cannot achieve from the heat dissipation area, the precision of the mold now directly affects the overall shape and heat dissipation capacity of our heat sink. Therefore, more manufacturers have begun to think of using CNC machining precision tools to directly cut a block of aluminum ingots to the shape of the heat sink we want. In this way, there will be no deformation during processing, and no impurities will enter the heat sink during processing, which can also maximize our heat dissipation area.
Copper CNC machining heat sink
The aluminum profile heat sink that has been used for such a long time, no matter how we change our processing technology, it is difficult to meet the increasing heat generation of the CPU. Some manufacturers have no hesitate to increase the cost in terms of cost, instead of aluminum and change to copper. Since the thermal conductivity of copper is much greater than that of aluminum, the thermal conductivity has doubled, which is of great benefit to our heat dissipation;
However, since the hardness of copper is much greater than that of aluminum, it is a severe test for the manufacturing process during the processing. Therefore, the traditional extrusion molding process can no longer be applied to copper, and has to become this cutting method for CNC machining.
Aluminum and copper stack heat sink
One thing worthy of our attention is that cost and profit are always the ultimate goals pursued by manufacturers. So major manufacturers began to come up with more optimized solutions. The copper and aluminum sheets are folded and pressed to make heat sinks of various shapes we want. Then it is connected with the appropriate various heat sink bottom plates by welding, which not only meets our heat dissipation requirements, but also speeds up our production progress and makes mass production easier.
Copper embedded heat sink
The most perfect solution to this compromise solution should belong to AVC's first copper embedding technology. This is the advantage of fast heat conduction speed, high density and strong heat absorption capacity of copper. Aluminum extruded heat sink has the advantages of light density, low price and convenient mass production; The copper embedded and traditional aluminum extrusion are harmoniously unified.
Inlaid copper heat sink
Another solution is that FOXCONN pioneered the use of copper contact blocks on the bottom of the radiator in contact with the CPU. The use of copper has the characteristics of fast heat absorption and strong thermal conductivity, and quickly brings a large amount of heat generated by CPU operation to the nickel-plated copper block. The copper block and the aluminum extruded heat sink are closely combined with the heat conductive paste, so that a large amount of heat can quickly diffuse to the aluminum extruded heat sink and be taken away by the rotation of the fan.
Pin tooth heat sink
Today, when the requirements for heat dissipation are increasing, the Japanese think of using huge pressing force to fit thin and dense heat dissipation fins into the heat dissipation base. This technology can be combined and matched with copper and aluminum fins and copper and aluminum base plates. And it also effectively avoids the disadvantages of a new thermal resistance caused by uneven thermal conductivity of various solder pastes during the soldering process. Make customers have more choices and diversity of thermal solutions. However, due to the particularity of its processing, the current mass production still has the problem of too high cost.
Heat sink fitted with heat pipe
Heat pipe is a major discovery in the field of heat transfer in recent years, and it is also the main heat dissipation material first used in heat sinks in notebook computers and major high-end communication industries. Due to its amazing heat conduction speed and recycling physical characteristics, our heat dissipation becomes easier and creates unlimited possibilities.