Body Jet,Body Jets,Lipo Jet,Body Spray Jets Kaiping Rainparty Sanitary Ware Technology Co.,Ltd. , https://www.helin-shower.com
The meeting discussed the development of ultrafine and nanocrystalline cemented carbides and cutting tools for extreme conditions. Mr. G Gill of HC Starck, Germany, and other manufacturers have reviewed the development of submicron cemented carbide in the past decade and pointed out that among the various factors affecting the improvement of alloy properties, ultrafine crystal The development of granular materials has played an important role. For example, the grain size of tungsten carbide (WC) powder has been reduced to sub-micron levels, even as low as 0.2 μm. For submicron grained carbide applications, G Gille believes that the production of submicron grained carbides worldwide (including China) in 2000 was between 11500 and 12500 tons, accounting for 40% of total cemented carbide production. . Among them, carbide drills and carbide milling cutters account for the largest share, up to 60%, about 7000 ~ 7500t, and these applications are still growing rapidly; micro-bits for the electronics industry account for 13%; wear parts, Circuit board scissors, paper and plastic cutters, chipless forming tools, dental tools, etc. accounted for 18%; woodworking tools accounted for 4%; metal cutting blades accounted for 5%. Micro-drilling for processing printed circuit boards is one of the primary and most important applications of sub-micron cemented carbides, and its consumption has been increasing dramatically. In the past 15 years, the speed of micro-drills has increased from 80000r/min to 180,000r/min, while the drill diameter has been reduced from 500μm to 200μm. The latest generation of micro drill diameters has dropped to 70μm.
In the market for submicron cemented carbides, metal cutting inserts account for only a small share. Tests have shown that sub-micron carbide metal cutting inserts are reliable for milling automotive cast iron parts and aluminum alloy parts, and it is expected that it will have some growth in this application area, especially ultra-fine (0.16μm) grain hard. Alloy.
According to F Friedrichs of Konrad Friedrichs, Germany, shaft machining tools also have a tendency to transition from high-speed steel tools to solid carbide tools. K44 grade (WC12%Co, added Cr3C2 and VC grain growth inhibitors, alloy crystal The particle size is 0.5μm) and has become a standard milling tool and profile cutter. F Friedrichs is convinced that K grade grades with alloy grain size of 1.5 to 0.2 μm and 6% to 12% Co may account for 90% of the application market. There is still considerable research and development space for the production of carbides and cemented carbides.
At this meeting, the characteristics of ultrafine carbide powders were discussed. Austria's A Bock and B Zeiler et al. discussed the production of submicron powders by CRC (calcination-reduction-carbonization) process and pointed out that the addition of chromium before calcination can control the grain growth very well. Since the additive can be uniformly dispersed and distributed on the grain boundaries between the carbide particles. W Grogger of the Technical University of Austria and his colleagues worked with Plani Tizit to study the chemical composition and distribution of additives in cemented carbides made from submicron powders using advanced analytical electron microscopy. They found that in the cemented carbide doped with chromium and vanadium, there is a vanadium carbide film at the interface and grain boundary between the tungsten carbide grains without chromium.
K Kitamura of the University of Tokyo in Japan and Toshiba Tangeruoyi and their colleagues discussed a new type of WC-Co cemented carbide made of complex (Co, W) tungsten carbide, which has a plate-like structure of tungsten carbide. It has anisotropy and its fracture toughness value is 10% to 15% higher than that of a conventional cemented carbide, and its hardness level is consistent.
At the meeting, delegates also exchanged technical knowledge on cutting tools such as ceramics, cermets, diamond tools and coated inserts and their coating processes used under extreme conditions, such as dry cutting of difficult-to-machine materials.
The application and development status of hard materials
The 15th International Plancy Conference was held at the WaHer Schwarzkopt Haus conference centre in Reutte, Tyrol, Austria, with 500 delegates from 40 countries and regions. At the meeting, some experts exchanged research progress on hard materials.