Joint process

This kind of radiator is made of aluminium or copper sheet fins, and then combined with heat conducting paste or solder on the heat sinking base with grooves. The characteristic of combined radiator is that fins break through the original proportion restriction, have good heat dissipation effect, and can choose different materials to make fins. The advantages of this process are that the Pin-Fin ratio of the radiator can be as high as 60, the heat dissipation effect is good, and fins can be made of different materials.

The disadvantage is that there will be interface impedance between fin and base by using heat conducting paste and solder joint, which affects heat dissipation. In order to improve these shortcomings, two new technologies have been applied in the field of radiator.

The first is gear shaping technology, which uses more than 60 tons of pressure to combine the aluminum sheet in the base of the copper sheet, and there is no medium between them. From the microscopic point of view, the two atoms are connected to each other to a certain extent, which completely avoids the disadvantages of the traditional combination of the two to produce interface thermal resistance, and greatly improves the heat transfer ability of the product.

Secondly, reflux welding technology, the traditional joint radiator is the interface impedance problem, and reflux welding technology is the improvement of this problem. In fact, the process of reflow welding is almost the same as that of traditional jointed radiator. Only a special reflow furnace is used. It can set the temperature and time parameters of welding accurately. Lead-tin alloy is used as solder to make the welded and welded metals fully contacted, thus avoiding leakage welding, ensuring that the connection between fin and base is as close as possible. It can also control the melting time and temperature of each solder joint to make all solder joints uniform. However, this special reflow furnace is very expensive, motherboard manufacturers use more, and radiator manufacturers seldom use it. Generally speaking, the radiator with this technology is mostly used in high-end, and the price is more expensive.

Forging process

The forging process is to heat the aluminium block to the depression point after heating and fill the die with high pressure. Its advantage is that the fin height can reach more than 50 mm and the thickness is less than 1 mm. It can get a large heat dissipation area in the same volume, and forging is easy to get a good dimensional accuracy and surface finish. But when forging, because of the necking phenomenon of cooling plastic rheology, heat sinks are prone to uneven thickness and height, thus affecting the heat dissipation efficiency. Because of the low plasticity of metal, cracking is prone to occur during deformation, and the large-tonnage forging machinery (more than 500 tons) is needed. It is also because of the high cost of equipment and dies that the product costs are high. And because of the high cost of equipment and die, unless mass production, the cost is too high.

Flexible process

Flexible manufacturing process first folds copper or aluminium sheet into one forming fin by forming machine, then fixes the upper and lower bottom plates with piercing die, and then welds the processed base into one by using high cycle metal welder. Because the manufacturing process is continuous, it is suitable for making heat sinks with high thickness to length ratio, and because the fin is formed as one, it is conducive to the continuity of heat conduction, the fin thickness is only 0.1mm. It can greatly reduce the demand for materials and obtain the maximum heat transfer area within the allowable weight of the radiator. In order to achieve mass production and overcome the interface impedance of material joining, the process part adopts high-cycle fusion welding, i.e. material fusion to prevent the interface impedance from occurring, so as to establish a high-strength, tightly spaced radiator. Because the process is continuous, it can be mass produced, and because the weight is greatly reduced and the efficiency is improved, the heat transfer efficiency can be increased.