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Skiving machine producing copper heat sink fins. Skiving is also used for the manufacturing of heat sinks for PC cooling products. A PC cooler created by skiving has the benefit that the heat sink base and fins are created from a single piece of material (copper or aluminum), providing improved heat dissipation and heat transfer from base to fins.
The heat sink thermal resistance model consists of two resistances, namely the resistance in the heat sink base, , and the resistance in the fins, . The heat sink base thermal resistance, , can be written as follows if the source is a uniformly applied the heat sink base. If it is not, then the base resistance is primarily spreading resistance:
The minimum amount of radius required to avoid any defect and problems depends on the extrudability of the material, as the material is more extrudable it can flow in corners with less radius. For example, for Aluminium, Magnesium and Copper alloys the minimum radius required for corners and edges is 0.75 mm whereas for ferrous metals for ...
One-piece finned heat sinks are produced by extrusion, casting, skiving, or milling. General case ... Constant material properties (independent of temperature)
For example, minimum thickness of extruded carbon steel sheet is 3mm whereas same sheet of aluminium can be extruded into minimum sheet thicknesses of 1mm. A variety of materials such as Carbon steel, aluminium, titanium, magnesium, ABS and PVC etc. can be manufactured via extrusion processes.
Aluminium is the most commonly extruded material. Aluminium can be hot or cold extruded. If it is hot extruded it is heated to 575 to 1100 °F (300 to 600 °C). Examples of products include profiles for tracks, frames, rails, mullions, and heat sinks. Brass is used to extrude corrosion free rods, automobile parts, pipe fittings, engineering parts.
Aluminum is the most prominently used heat sink material because of its lower cost. [46] Copper heat sinks are a necessity when higher levels of thermal conductivity are needed. An alternative to all-copper or all-aluminum heat sinks is the joining of aluminum fins to a copper base. [47] Copper heat sinks are die-cast and bound together in ...
Generally, forced convection heat sink thermal performance is improved by increasing the thermal conductivity of the heat sink materials, increasing the surface area (usually by adding extended surfaces, such as fins or foam metal) and by increasing the overall area heat transfer coefficient (usually by increase fluid velocity, such as adding ...