Machining heat sink fins
As fin is an inevitable part of heat sink, it's critical for heat dissipation, but there are varieties of heat sink fins, different fins have different machining approaches.
Aluminum extrusion heat sink fins:
it's a very simple fin, and the machining is very usual, firstly, the heat sink body comes from the aluminum ingot, then cut to length and cross cut,CNC.......
Pin fins are often made by cross cut and cold forging. it's a regular way to produce pin fin heat sinks.
Skived fins are machined by sepcial machine and techology, it's cut from a aluminum or copper block piece by piece.
Zipper fins are made by stamping machines, often it needs a specified mold.