The countersinking method used to process a flat or tapered countersink on the hole surface is called countersinking. The milling work is shown in Figure 1.
Figure 1 Milling work
a) Cylindrical milling b) Conical milling c) Boss plane milling
Milling tools are often used, and there are the following types:
1) Cylindrical milling is shown in Figure 2 and is mainly used for milling cylindrical holes. The cylindrical countersink drill modified with a twist drill is shown in Figure 3.
2) The taper countersink drill bit is shown in Figure 4 and is mainly used for countersinking taper holes. The cone angle (2φ) of the cone cutter is different according to the cone angle of the cone cutter of the workpiece, and there are four types: 60°, 75°, 90° and 120°, of which 90° is most commonly used.
Figure 2 Column
Figure 3 Cylindrical countersink drill modified with a twist drill
Figure 4 Tapered Countersink Drill
3) End face milling: A simple end face milling is shown in Figure 5. The blade is ground from high speed steel blade and is fixed with screws after being installed in the tool shaft. Multi-tooth end milling is shown in Figure 6.
4) The nesting tool for milling large holes in thin plates is shown in Figure 7.
Figure 5 End face milling
Figure 6 Multi-tooth end Figure 7 Socket tool for milling large holes in thin plates
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