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PVD technology to develop the types of ceramic dura mater, including titanium nitride, titanium carbonitride, titanium carbide, alumina, diamond-like film and titanium nitride and so on. Such ceramic dural is currently applied to the tool or die, not only can improve the wear resistance of the tool surface, and without losing the toughness of metal substrates. With the recent breakthroughs in machine tool technology, cutting has been moving toward high-speed, in order to shorten the cutting time and improve the workpiece surface accuracy.
"The current trend of machine tools for high-speed, high precision and high quality." High-speed operation of the mold, cutting tools, mechanical parts, surface treatment requirements are also getting higher and higher. Extend the service life, reduce production costs and create higher profits, is the common goal of the industry.
In order to meet the high-speed processing, a large number of processing time and cost savings, tool improvement has become an important factor. Tungsten carbide tool for a higher wear resistance and hardness, increasing the proportion of the tool market.
In order to obtain the best benefit, we must choose the appropriate surface treatment. The middle and heavy duty molds should adopt CVD high-temperature titanium plating, supplemented by precision vacuum heat treatment, in order to reach the acceptable deformation. This part is commonly used in cold forging die, hydraulic pumping die, tungsten carbide pumping line, pumping tube. In the middle, low load or precision requirements of the tool, mold and mechanical parts of the application, the low temperature (150 ℃ ~ 500 ℃) PVD titanium plating is more appropriate.
High aluminum content of aluminum nitride titanium is easy in the hard surface of the formation of alumina. This layer of oxide film can make titanium nitride ceramic hard film oxidation temperature of 923 degrees Celsius, tungsten carbide cutting tool to protect the high-speed cutting edge oxidation resistance and maintain high temperature hardness. However, titanium nitride and titanium carbonitride, although at high temperatures will also produce titanium oxide film, but it is not easy to adhere to the dural and with the chip peel, so that dura lack of protection, rapid oxidation and degradation. Therefore, regardless of high temperature or low temperature coating surface treatment must choose the appropriate substrate and stable heat treatment, supplemented by the surface of fine grinding fine polishing of the pre-treatment, in order to attain perfection.
Due to the combination of high strength, short production cycle, low processing costs, especially in the grinding tool edge is not easy to cause chipping, and in accordance with the requirements of the use of the grinding wheel, Grinding into a variety of complex shapes of grinding wheel, so the production is still widely used in the long term. How to further improve the grinding performance of such grinding wheel, has also become an important work.
With the rapid development of tool design, manufacture and application technology, and the increasing of tool output, the ultra-high temperature resin bonded diamond grinding wheel can not fully meet the requirements of mass production tool, and its quantity and quality still have room for further development. . To this end, the Shanghai Zhongyu company is further study how to improve the grinding performance of this wheel, especially for the wear resistance of binder, binder and diamond abrasive strength and self-sharpening and so a large number of experimental studies, made A great progress. The results show that the grinding wheel efficiency can be improved by about 20%, and the wheel life can be improved by about 50%.
