16 12 06 the performance differences and development of ceramic tools and coated ceramic tool

Halnn Superhard Materials Co.,Ltd

The Performance differences and development of ceramic tools and coated ceramic tool During machining process, cutting is one of the most basic, commonly and important method in industrial production, which directly affects industrial production efficiency, cost and energy consumption. Improve processing efficiency, it will bring great social and economic benefits. In recent years, ceramic tool industry has achieved rapid development, the materials of modern ceramic tool were mostly composites. Currently the ceramic material of tool used mainly were alumina-based ceramic material, silicon nitride-based boride , titanium-based and cermet series. And wherein the metal ceramic matrix composites is a new developing material gradually in the 1930s. Since the cermet having a high hardness, wear resistance, good thermal conductivity and excellent performance it is widely used as a tool material. The following is a cermet tool pictures.

Part 1 Cermet tools development process Most early was began the experimental study of TiC compound Twenties in 1920s.

TiC-Mo-Ni cermet as a high-speed precision cutting tool material for steel In 1950s for the first time. Although it has a comparable alloy high strength and hardness, the toughness is poor. In order to improve the toughness of the cermet, improving the cutting performance.

In 1970s people finally developed a high toughness fine particles of TiC-TiN-based cermet .

Since then, the cermet was used widely in the cutting tools development.

Part 2 The characteristics and machining range of the cermet cutting tools Cermet tools generally refers TiCN/TiC/TiN as a hard phase in the hard alloy industry , add Co or Ni as a binder phase, in many occasions, adding to the Periodic Table IVB, VB and VIB as additives to enhance the temperature properties.

Cermet tools features: (1) high hardness; (2) with the low affinity of workpiece material, not easy to BUE; (3) good chemical stability; (4) heat resistance, wear resistance.

Suitable for processing: cermet tool can process a variety of steel and cast iron semi-finishing and finishing, when the cutting depth was less 2.5mm , feed rate less than www.halnntools.com

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0.25mm/r , the amount of feed less 0.2.mm per tooth , cermet tool has an excellent cutting performance. But cermet tool is not suit for interrupted cutting , it easy happen to breakage.

Note: Cermet tool mainly used for semi-finishing and finishing the workpiece material which hardness was less HRC45 steel and cast iron, if machine harder materials (such as high hardness cast iron roll, high chrome cast iron, high temperature above HRC45 alloys and other materials), cubic boron nitride(CBN) or ceramic tool is better.

Part 3 The materials properties and applications comparison of cermet tools, ceramic tools and cubic boron nitride cutting tools (Source: Zhengzhou Halnn superhard materials Co., Ltd.) (1) from the development of tools material and cutting machine speed (as above picture) : in the field of processing of ferrous metals: cubic boron nitride cutting tools> ceramic tool> cermet cutting tools.

(2) compare the hardness of the work piece which the tools can machine: cubic boron nitride cutting tools (machining hardness above HRC45)> ceramic cutting tools (machining(finishing) hardness between HRC40 to HRC55)>cermet cutting tools (semi-finishing and finishing materials hardness less than HR45 ).

(3) comparison of those tools hardness and cutting speed: cubic boron nitride cutting tools> ceramic tool>cermet tool (in the field of machining ferrous metals ); such as cubic boron nitride BN-S30 from Halnn superhard material can milling of gray cast iron engine block with speed of 1700m / min or even more high-speed ; and a high concentration of cubic boron nitride cutting tool brands BN-K1 can process tungsten carbide with hardness HRC79 .

(4) comparison of tool materials toughness: Cermet> cubic boron nitride (CBN)> Ceramic Tool ; But some are exception , such as the development of non-metallic adhesive cubic boron nitride tool from Halnn Superhard material has an excellent toughness, can rough the rough parts with high hardness and high alloy, and can withstand intermittent cutting.

Part 4 The Typical applications of Cermet cutting tools : (1) Cermet tool for turning: Tilok company developed two new cermet cutting tools were respectively NS9530 uncoated and GT9530 with coated, they have a good resistance to chipping damage and wear resistance, improved the tools life, suitable for semi-finishing and finishing, which GT9530 is more suitable for high-speed machining. These two new insert grades not only can be applied to the positive and negative rake angle,but also can be applied to the left or right hand blades.

(2) Cermet milling tool: PFK-HN ceramic tool from Germany SPK processing HT250 compressor housing with: Vc = 800m / min, Fz = 0.16, ap = 3mm rough milling the surface , using HNGX100521- T-type ceramic blade, increase the cutting edges of each www.halnntools.com

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blade from the previous 8 to 12. Even if the processing time over 150 minutes, there just v a small ceramic inserts appear wear on the blade.

(3)cermet can also be made hob and drill. Just like cermet hob which Japan developed, Ď…c = 600m / min, about 10 to 20 times than carbide hob, surface roughness value Rmax of 2Îźm.

(4) when turning, we need to adapt to the cutting of the breaker units; or milling end milling, choose the appropriate tool geometry is essential .

Part 5 Summary Some academics have thought cermet tool is still attributed to metal ceramic tool carbide cutting tools categories rather than to the ceramic tool; while cubic boron nitride cutting tools, silicon nitride tool, alumina ceramic tool are all classified as ceramic tool material on materials science , but from the application and performance of the tools, cermet tool was do better than Coated carbide tools.

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