aluminum extrusion heatsink process introduction
For the heatsink with simple structure and low power consumption, its processing technology requirements are also relatively low, which is suitable for low-cost mass production.Here is the introduction to the processing technology of several commonly used aluminum profile heatsinks.
Aluminum extruded heatsink：
Heat the aluminum material to about 520 ~ 540 ℃ at high temperature and let the aluminum liquid flow through the extrusion die with grooves under high pressure to make the primary embryo of the heat sink. Then, after cutting and grooving the primary embryo of the heat sink, we can make the common heat sink. Aluminum extrusion technology is easy to realize and the equipment cost is relatively low. The commonly used aluminum extrusion material is aa6063, which has good thermal conductivity (about 160 ~ 180 w / m.k) and processability.
Aluminum die casting :
After melting the aluminum ingot into liquid state, it is filled into the metal model, and the heat sink is made by direct die casting with a die casting machine. The pressure injection method can make the fins into a variety of three-dimensional shapes. The heat sink can be made into complex shapes according to the demand. It can also make a heat sink with diversion effect in cooperation with the fan and air flow direction, and can make thin and dense fins to increase the heat dissipation area, It is widely used because of its simple process. The commonly used die-casting aluminum alloy is ADC12. Due to its good die-casting formability, it is suitable for making thin castings. However, due to its poor thermal conductivity (about 96 w / m.k), al1070 aluminum is mostly used as die-casting material in China, with a thermal conductivity of about 200 W / m.k, which has a good heat dissipation effect.
Cold forging heatsink:
The forging process is formed by heating the aluminum block to the yield point and filling the die with high pressure. Its advantage is that the fin height can reach more than 50mm and the thickness is less than 1mm, the maximum heat dissipation area can be obtained in the same volume, and it is easy to obtain good dimensional accuracy and surface finish. However, during forging, due to the necking phenomenon during cooling plastic rheology, the heat sink is easy to have uneven thickness and height, which affects the heat dissipation efficiency. Due to the low plasticity of metal, it is easy to crack during deformation and large deformation resistance, large ton (more than 500 tons) forging machinery is required, and the high cost of equipment and die leads to high product cost. And because of the high cost of equipment and molds, the cost is too high unless for high volume mass production.
