Although the heat sink is small, it is an important device for cooling the heat-prone electronic components in electrical appliances. For example, the computer will be heated for a long time, and the radiator in the CPU can play a role in cooling, so that the service life of the computer can be extended. So how is an aluminum radiator made and how does it work? Material options for heat sinks Heat sinks are available in a variety of material options. Available in silver, copper, aluminum and steel. Different materials have important influence factors on the heat dissipation effect of the radiator. From the analysis of thermal conductivity, silver is the best, but silver is not the first material, because the price of silver is too expensive. Copper is a close second with almost twice the thermal conductivity of aluminum, but it must be said that aluminum is the most commonly used material. Aluminum is the material of choice regardless of price or thermal conductivity. How does an aluminum radiator work? The working principle of the radiator is very simple. That's by increasing the surface area. Therefore, the requirement for the heat sink is that the heat absorption is very fast, the heat loss is also very fast, and a good heat transfer effect is achieved. Common manufacturing solutions for aluminum radiators Extrusion The extrusion process is suitable for mass production of aluminum radiators, with less investment, short development cycles and low production costs. The commonly used aluminum extrusion material is aluminum 6063, which has good thermal conductivity. Its working principle is to heat the aluminum ingot to 520-540°C under high pressure, so that the aluminum liquid flows through the extrusion die with grooves to make heat sinks. Then cut the heat sink embryo, profile groove and other processing processes, which are the heat sinks we usually see. Aluminum extrusion process to make fins. The ratio of fin thickness to length is limited within a certain range, the pin-fin ratio. It is one of the main standards for testing aluminum extrusion technology. The larger the PIN-FIN ratio, the larger the effective cooling area of the radiator. It is difficult to improve the heat dissipation area in a limited space, so the heat dissipation effect of the aluminum extruded heat sink is not very ideal. In radiator processing, the aluminum extrusion process is mainly used to manufacture layered fins or cylindrical fins. CNC machining CNC aluminum machining involves various processes such as turning, drilling, milling and grinding. The process can be flexibly applied according to the structure of the part, the use of most structural parts, such as plate forming, radiator slotting, bottom surface finishing, etc. But the disadvantage is that the wear of the tool will be relatively fast, so manual participation in machine management is required, which takes up a certain amount of labor costs. The principle of die-casting die-casting aluminum radiators is similar to injection molding. The aluminum alloy raw material is dissolved in the liquid under high pressure, and then the liquid material is quickly filled into the metal model. According to the model, the die-casting machine starts to work, one-time die-casting, after cooling and subsequent processing, it is made into a single radiator. The process can be integrated into thin, dense or complex heat sink designs. The disadvantage of this process is that it affects the thermal conductivity and mechanical properties of the material, and nuclear thermal conductivity cannot do both. What are some common finish options for aluminum radiators? Sand blasting can strongly impact the surface of the workpiece under high pressure, and effectively remove some dirt or knife marks on the surface of the processed aluminum parts. It also makes parts look more uniform and shiny, and improves the mechanical properties and fatigue of aluminum heat sink surfaces. Brushed A brushed finish can give parts a more metallic feel and a sleeker look. In addition to its decorative effect, wire drawing can also increase the heating area of parts to a certain extent and improve the efficiency of aluminum radiators. Anodizing Anodizing is one of the most widely used surface treatments for aluminum radiators today. Through anodizing, a layer of protective film will swim on the surface of the parts, which can not only resist scratches, wear and loss, protect the parts, but also overcome the defects of aluminum alloy surface hardness. Electroplating Electroplating can effectively protect and decorate aluminum radiators. The principle is similar to anodizing. It is also a protective film on the surface of the part to prevent anodic oxidation on the surface of the part. At the same time, it also improves the wear resistance, reflectivity, conductivity and corrosion resistance of the parts. Contact Us Vowin
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