In the skiving process, fins are machined using special tooling, whereby precisely sliced layers from an extruded metal block are bent at the base of the slice to form slender curved fins. Since the fins and base is an integral unit, the interface resistance seen in folded and bonded heat sinks is not present. This process was originally developed to manufacture sparse natural convection arrays, but recent efforts have been focused towards achieving tighter fin spacing, necessary for forced convection cooling.
Aluminum 6063 is the preferred material on account of its superior machinability and strength, but copper arrays can also be made. The depth of cut determines the fin thickness (T) and can be very low between 0.10 – 0.8mm, resulting in extremely thin fin structures, yielding light and competitive heat sink designs. The distance between fins can be shortened as much as 0.4mm and their height can reach 300mm. The ratio of height/thickness can reach easily around 250 times.
Skived heat sink can be an alternative to extruded heat sink when looking for a fin density which can NOT be achieved by extrusion technology.
Skived heat sink fabrication does not need expensive tooling which provides greater design flexibility. Instead, each fin is cut separately using the same tool which allows for lower tooling costs.
Skived heat sink can be made of copper and aluminum, enables solid copper solutions.The skiving process is a good thermal solution for high power cooling.
Skived heat sink leading the heat innovation innovation high density ,high thermal performance, high aspect ratio, excellent performance.
Skived heat sink without interface joint between the fins and base, improved thermal performance than traditional heat sink.
Integrated manufacturing, no welding and mold opening;
The thickness and spacing of fin can be made thinner and denser;
The thermal conductivity is superior to the traditional extrusion and bonded fin process.
Skived heat sinks
Both fins and base are cut from a single piece of metal by repeatedly slicing the top off of a belt of metal and folding it back onto the base. Skived heat sinks can be made with thin fin and high density geometries while benefiting from the thermal conductivity of a uniform piece of metal (no impedance from bonding).