In the machining process, cutting directly affects industrial production efficiency, cost, and energy consumption. Improving processing efficiency will bring huge social and economic benefits. The ceramic tool industry has achieved rapid development in recent years, and modern ceramic blade materials are mostly composite materials. The ceramic materials currently used in cutting tools are mainly the alumina series, silicon nitride series, titanium boride series, and cermet series. The metal-ceramic matrix composite material is a new type of material that gradually developed in the 1930s. Cermet inserts are widely used as tool materials due to their excellent comprehensive properties such as high hardness, good wear resistance, and good thermal conductivity.
The development history of cermet insert::
Cermet inserts used in cutting tools* began as early as the 1920s on the experimental study of TiC compounds. In the 1950s, TiC-Mo-Ni cermets were first used as tool materials for high speed precision cutting of steel. Although it has high strength and high hardness comparable to cemented carbide, its toughness is relatively poor. To improve the toughness of cermets and improve their cutting performance, in the 1970s, people* finally developed a fine-grained TiC-TiN-based cermet with high toughness. Since then, the application of cermets in tool development has become increasingly widespread.
The characteristics and processing range of cermet inserts:
In the cemented carbide industry, cermet blades generally refer to TiCN/TiC/TiN as the hard phase, adding Co or Ni as the bonding phase. In many cases, adding one of the metals of the IVB, VB, and VIB groups of the periodic table More than three kinds of nitrides, carbides, and carbonitrides are used as additives to enhance the mechanical and high-temperature performance of cermet.
Features of cermet inserts:
- High hardness
- The affinity with the workpiece material to be processed is low, and it is not easy to produce a built-up edge.
- Good chemical stability
- Heat resistance and good wear resistance.
Suitable processing range:
The cermet insert is suitable for semi-finishing and finishing various steel and iron castings. When the cutting depth is below 2.5mm, the feed per revolution is below 0.25mm/r, and the feed per tooth is Below 0.2.mm/tooth, cermet tools have excellent cutting performance. The cermet blades of the above materials can provide a stable tool life and good surface finish. However, it is not suitable for cermet tools in the field of intermittent cutting, and the blade is prone to breakage.
In terms of the hardness of processing materials, cermet tools are mainly suitable for semi-finishing and finishing steel and cast iron with hardness below HRC45, for difficult-to-machine materials above HRC45 (such as high hardness cast iron rolls, high chromium cast iron, It is better to choose cubic boron nitride cutting tools or ceramic cutting tools.