CNC milling machine is the most commonly used CNC computer gong machining equipment. So, what are the common CNC tools of CNC milling machine? What materials are these knives made of? Today we'll find out.

Regarding the types of CNC cutters, the commonly used CNC milling cutters can be divided into three types: flat-bottomed cutters, round nose cutters and ball cutters.

Flat-bottomed knives

Flat-bottomed knives are also called flat knives or end mills, with a main cutting edge around and a secondary cutting edge at the bottom. It can be used for roughing and cleaning corners, finishing side planes and horizontal planes.

Commonly used are ED20, ED19.05 (3/4 inch), ED16, ED15.875 (5/8 inch), ED12, ED10, ED8, ED6, ED4, ED3, ED2, ED1.5, ED1, ED0.8 And ED0.5 and so on. E is the first letter of End Mill, and D represents the diameter of the cutting edge. Under normal circumstances, try to choose a larger diameter knife when cutting rough, and install the knife as short as possible to ensure sufficient rigidity and avoid bouncing the knife. When choosing a small knife, it is necessary to determine the shortest length of the blade edge and the length of the straight body according to the area to be processed, and choose the most suitable knife available in our company. If the side with a slope is called a slope knife, it can finish the slope.

Round nose knife

Round nose knife is also called flat bottom R knife, which can be used for rough cutting, plane smooth knife and curved surface smooth knife.

The general corner radius is R0.1~R8. There are generally monolithic and insert-grained handle knives. The round nose knives with knife grains are also called "flying knives", which are mainly used for large-area roughing and horizontal smooth knives. Commonly used are ED30R5, ED25R5, ED16R0.8, ED12R0.8 and ED12R0.4. When roughing the flying knife, try to choose a large knife. When machining a deep area, the length of the knife should be installed first to process the shallower area, and then install the long tool to process the deeper area, so as to improve the efficiency and not cut it.

Ball knife

Ball knife is also called R knife, mainly used for light knife and light knife in curved surface.

Commonly used ball knives are BD16R8, BD12R6, BD10R5, BD8R4, BD6R3, BD5R2.5 (commonly used for processing flow channels), BD4R2, BD3R1.5, BD2R1, BD1.5R0.75 and BD1R0.5. B is the first letter of Ball Mill. Under normal circumstances, it is necessary to determine the tool used for finishing by measuring the inner circle radius of the processed graphics, and try to choose a large knife for smooth knife and a small knife for supplementary knife processing.

After understanding the types of CNC tools, let's take a look at the tool materials. In metal cutting, the tool material, that is, the cutting part, has to bear a lot of cutting force and impact, and is subjected to severe friction from the workpiece and chips, resulting in a high cutting temperature.

Its cutting performance must meet the following six aspects:

• Sufficiently high hardness: above HRC62, at least higher than the hardness of the processed material.

• Sufficient wear resistance: Generally, the harder the material, the more carbon in the tissue, the finer the particles, and the more uniform the distribution, the higher the wear resistance.

• Sufficient strength and toughness.

• High enough heat resistance.

• Good thermal conductivity.

• Good craftsmanship and economy.

In order to meet the above six requirements, the current CNC tools are generally made of the following materials:

• High-speed steel, such as WMoAl series.

• Carbide, such as YG3, etc.

• New cemented carbide, such as YG6A.

• Coated tools, such as TiC, TiN, Al 2O3.

• Ceramic knives. It can still withstand high cutting speeds at high temperatures.

• Super hard tool material.

Last few words

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