What is milling?
Milling is a processing method in which metals are removed in stages through movement. The milling cutter makes a rotary motion, and the workpiece and the tool do a relative linear feed (in most cases, the workpiece is fed with the table).
In some cases, the workpiece remains fixed, while the rotating tool does horizontal linear feed. The milling cutter has several cutting edges that can continuously cut a certain amount of material. When two or more cutting edges cut into the material at the same time, the tool cuts the material to a certain depth on the workpiece. Figure 1 is a schematic diagram of the processing of various milling cutters.
- Rough milling
The rough machining (rough milling) of milling is marked by the amount of cut removed. In rough milling, large feed and as large cutting depth as possible are used to remove as much metal blank material as possible in a short time. Rough machining does not require high surface quality of the workpiece.
- Fine milling
In the finishing of milling (finishing milling), the main consideration is the surface quality of the workpiece rather than the amount of metal removal. The finishing milling usually uses a small cutting depth, and the secondary cutting edge of the tool may have a special shape. Depending on the machine tool used, cutting method, metal material, and standard milling cutter used, the surface quality of the workpiece can reach Ra1.6μm, and even Ra0.4μm under excellent conditions.
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