CNC machining can be divided into two categories: ordinary machining and high-speed machining.
Ordinary machine generally refers to the machine tool with a revolution of less than 8000; high-speed machine generally refers to the machine tool with a revolution of more than 12000, and the machine tool between 8000 and 12000 is called quasi high-speed machine.
CNC machining process is usually divided into three categories: rough cutting, medium light (semi fine) and smooth cutter (fine milling). Generally speaking, it is better to use large cutter (flying cutter and end milling cutter) and large cutting depth and step (heavy cutting) for rough cutting, so as to remove materials quickly and in large quantities. In order to obtain the perfect surface accuracy, light cutting (small cutting depth, small step) with high speed and feed is used. End milling cutter (or fillet cutter) and flying cutter for smooth surface, end milling cutter for smooth vertical wall and ball cutter (or fillet cutter) for smooth surface.
In the process of machining, appropriate cutting tools should be selected according to the material hardness of the parts to be processed, such as plastic, wood, etc. domestic white steel knives can be selected.
Copper, aluminum and steel with hardness less than 38 degrees Rockwell (such as 45 steel and trump material) shall be imported steel knives and domestic high-quality steel knives. For materials with high hardness (such as hardened die steel), alloy knife, titanium plated knife or tungsten steel knife should be preferred.
In this paper, some cutting parameters of popular CNC machining center are provided for reference. Various kinds of cutting tools (flying knife, white steel, end milling cutter, tungsten steel flat milling cutter, white steel ball cutter, tungsten steel ball cutter) are described respectively for roughening and smooth cutter. Due to the large number of workpiece materials, this table only describes the representative aluminum alloy, 45 steel and stainless steel.