The Advantages Of Coated Tools And The Latest Technological Developments - Tools, Coating Tools -

Nearly 30 years ago, Tools The rapid development of coating technology

, coating has been widely used tool. 1969 German Krupp (Krupp) and the Swedish company Sandvik (Sandvik) the company successfully developed a chemical vapor deposition (CVD) coating technology, and markets a CVDTiC coated carbide blade products. The early 70s of the 20th century, the United States this summer (R. Runshan) and Rugby Juan South (A. Raghuran) developed a physical vapor deposition (PVD) process, and in 1981 will PVDTiN products to market high-speed steel cutting tools. CVD coating process at a temperature of about 1000 , mainly used in carbide cutting tools (blades) of the surface coating; PVD coating process temperature of 500 and 500 the following, mainly for high-speed steel cutting tools of surface coatings.

Later, CVD and PVD coating technology has developed rapidly in the coating materials and coating equipment and processes, and so have a lot of progress, and the development of a multi-material coating technology to coat tool ( blade) and performance has been greatly improved. PVD coating technology in the past mainly for high-speed steel tools, but in recent years with the rapid development of PVD coating technology, has successfully used carbide cutting tools (blades), the occupation of the carbide coated cutting tool (blade) and half of the positions . Now, coated high speed steel cutting tools and coated carbide tools (inserts) is widely applied, accounted for all the tools to use for more than 50% of the total.

The superiority of coated tools Good tool in the toughness (blade) surface coating substrate, coating with high hardness, high wear resistance, high temperature resistant material layer (such as TiN, TiC, etc.), so that the tool (blade) with overall, good overall performance. The hardness of uncoated high speed steel is only 62 ~ 68HRC (760 ~ 960HV), the hardness of cemented carbide is only 89 ~ 93.5HRA (1300 ~ 1850HV); and after coating the surface hardness of up to 2000 ~ 3000HV above.

As the surface coating material has high hardness and wear resistance, and high temperature. Therefore, with the uncoated tool (blade) than coated tools allows high cutting speed, thus improving cutting efficiency; or in the same cutting speeds, improve tool life.

As the coating material and the material being processed between the friction coefficient smaller, so coated tool (blade) of the cutting force smaller than the uncoated tool (blade).

with the coated tool (blade) processing, and parts machined surface quality is better.

As the coated tool (blade) of the overall performance well and coated carbide inserts have better general performance, a coated carbide blade has a wide scope of use.

Tool coating technology development and progress

I repeatedly visited the International Machine Tool Tool Exhibition, a lot of information gathered and listened to the major tools for the company's technical report, to understand tool products surface coating technology development and progress.

CVD coating technology progress

The past, carbide cutting tools coated with high temperature chemical vapor deposition (HTCVD) process. Deposition at atmospheric pressure or negative pressure system, the pure H2, CH4, N2, TiCl4, AlCl3, CO2 and other gases under the sediment composition, according to a certain uniform mixing ratio, followed by coating to have a certain temperature (usually 1000 ~ 1050 ) of the carbide blade surface, that is deposited on the surface in the blade TiC, TiN, TiCN, Al2O3 or their coatings. Until now, HTCVD process is still the most used method, in addition to HTCVD, there are plasma chemical vapor deposition (PCVD) process, which is cemented carbide tool (blade) surface coating of another way, because this lower temperature coating process

by: gaga

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