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The origin and application of CNC carbide cermet inserts

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The materials of industrial CNC carbide cermet inserts have complex chemical composition. The CNC carbide inserts material is made by adding secondary carbides (such as WC, Mo2C, TAC and Co Ni) as binders in tic tin matrix. The commercial cermets have high hardness and strength and toughness comparable to cemented carbide. With the continuous improvement of cermet properties, it has become a very popular metal cutting tool material.

It is suitable for medium load and finish machining of all kinds of steel and ceramic parts. When the cutting depth (AP) is less than 2.5mm, the feed per revolution (FN) is less than 0.25mm/r, and the feed per tooth (Fz) is less than 0.20mm/tooth, the cermet tool has excellent cutting performance.

Cermet blade can be used to cut and process all kinds of steel materials (such as carbon steel, alloy steel, low carbon steel, cast steel, cast iron, etc.), and also suitable for some processing methods (such as turning, milling and end milling). According to its material properties, cermet tool is very suitable for high-speed cutting, and is not easy to produce chip accretion, which will ensure that users can obtain very accurate machining results.

Cermet cutting tools materials have good heat resistance and wear resistance. Therefore, compared with cemented carbide tools which can maintain their physical shape for a long time, cermet tools can maintain the sharpness of cutting edge for a long time. Compared with cemented carbide tool, the surface of workpiece machined by Cermet Tool is smoother.

Up to now, cermet has been widely used to process various steel parts, and in recent years, it has become the preferred tool material for precision cutting cast iron and ductile iron. It is easy to produce high-frequency vibration when processing cast iron, and its side effect is to produce broken chip, because high-frequency vibration can cause the metal ceramic cutting edge to collapse or damage. However, today's cermet grades have been toughened and reinforced, and their toughness and strength are enough to maintain the stability of the cutting edge when processing cast iron.

In addition, cermet can provide stable tool life and good surface finish, whether it is cutting common workpiece materials, or processing various alloy steels and hardened steels with hardness lower than hrc45. As the development trend of current cutting, economic feasibility and high-speed cutting become more and more important. At the cutting speed of 500m / min, Cermet Tool life can be increased by more than 15 minutes, and the tool life is more balanced.

The origin and application of cermet inserts

Cermet was first used in cutting tools in 1920s. In the 1950s, tic Mo Ni cermet was first used as tool material in high-speed and precision cutting of steel. Some excellent properties of TiC based cermets (such as high hardness, low specific gravity and chemical stability at high temperature) make it possible to become a substitute for WC based cemented carbides. However, at that time, tic based cermet was not widely used as an industrial cutting tool material, because although it has the same high strength and hardness as cemented carbide, its toughness is relatively poor.

In the 1970s, in order to improve the toughness and cutting performance of cermets, a kind of fine-grained tic tin based cermet with good toughness was developed. Since then, cermet has been widely used in tool development. Cermet is very suitable for precision cutting and near net forming. Its application is expanding and has become a kind of basic cutting tool material. Today, this material shows excellent cutting performance in precision machining. WC is the main component of cemented carbide, which is considered to be a strategic raw material. With the rapid rise of global tungsten price, cermet, as a kind of tool material which can partly replace cemented carbide, is receiving more and more attention.

Correct selection of cermet inserts

When cutting, the user must carefully select the appropriate cermet inserts, because its machining characteristics are quite different from that of coated cemented carbide. Unlike coated cemented carbide, cermet is not suitable for rough machining. When the chip produced is large, the shear effect and cutting resistance will change greatly. This kind of continuous impact will cause the machining size to exceed the tolerance, and eventually lead to tool breakage.

In addition, the impact of the large chip roll on the back of the tool will aggravate the scratch wear and damage the CNC carbide cermet inserts. When cutting hard to machine materials (such as nickel based, iron-based and cobalt based heat-resistant alloys), this kind of severe scratch wear is more likely to occur. Therefore, cermet tools are not suitable for cutting difficult materials. For this reason, coated cemented carbide tools are more suitable for machining difficult materials and roughing than cermet tools. Like CVD coated cemented carbide tool, cermet tool is also a kind of high-speed cutting tool with good economy.

 

 

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