| Since the world industry economy drivers into a period of rapidly development in the21st century, with the development of the manufacture industry such as automotive, aerospace, military, machine tools, bearing tools, instruments and meters, photoelectric materials and so on, the pursuit of enormous benefit of the super-high speed grinding technology has being more and more earnest for nations. In recent years, super-high speed vitrified bond CBN grinding wheel has become the focus development of the world abrasive tools because of its proved high-speed, high efficiency, high precision, low-cost, low environmental pollution and broad prospects of application. Therefore, to understand and master the key technologies and features of super-high speed vitrified bond CBN grinding wheel has became a more urgent need for development of the China’s equipment manufacture industry.In this paper, based on systematic analysis of research status and the development frontier of vitrified bond super-high speed CBN grinding wheel, the key technologies for super-high speed vitrified bond CBN grinding wheel was researched. Combined nano-composite technology with traditional grinding wheel preparation process, the super-high speed nano-vitrified bond CBN grinding wheel with markedly improved mechanical properties and thermal properties was developed. Base on the theoretical research, a series of advanced technology which include computer simulation technology, modern measurement techniques and super-high speed grinding technology were integrated use for super-high speed nano-vitrified bond CBN grinding wheel research. The method combined computer simulation optimization with experimental study was used to reveal the vitrified bond super-high speed CBN grinding wheel processing mechanism and characteristics. Include the wear status and characteristics of super-high speed nano-vitrified bond CBN grinding wheel, the ductile regime grinding characteristics of CBN grinding wheel was also studied. It has provides a theoretical and technical support for super-high speed nano-vitrified bond CBN grinding wheels’manufacture and application.The main research work and achievements are as follows:1. A detailed research about the CBN abrasives has been carried out on its performance. Also, the nanocomposite technology was innovative introduced into the development of new vitrified bond preparation processing, and the new nano-vitrified bond has a much better thermal and mechanical properties than traditional vitrified bond. And then, the structural optimization design of super-high speed vitrified bond CBN grinding wheel was carried out by combining preparation technology with finite element optimization design method. The nano-vitrified bond matched with optimization select CBN abrasive, ultimately the super-high speed nano-vitrified bond CBN grinding wheel which can withstand250m/s work line speed with excellent performance was manufactured.2. The accurate and advanced virtual CBN abrasives and virtual CBN grinding wheel geometry model was founded by random spatial cut plane algorithm before the research of characteristics and mechanism of vitrified bond CBN grinding wheel. It can be easily realized by secondary development of ANSYS APDL. The whole modeling process can be parameterized design in line with the natural random characteristics.3. Based on the research of grinding mechanism simulation, in order to research the grinding characteristics of the experimental manufactured nano-vitrified bond CBN grinding wheel such as grinding force, grinding temperature, grinding ratio and specific grinding energy, three grinding hard metals including stainless steel, high-speed steel and titanium were used to grinding. By comparison with ordinary vitrified bond CBN wheel, the results proved that the experimental manufactured nano-vitrified bond CBN grinding wheel has showed a better performance than the ordinary CBN grinding wheel.4. The forward-looking significance combination of the simulation and experimental study on ductile regime grinding of CBN Wheel was carried out. Through the experiments of grinding hard and brittle materials such as SiC, SiO2, Si3N4ceramic which were used nano-vitrified bond CBN grinding wheel in processing. It can be confirmed that the super-high speed vitrified bond CBN grinding wheel is also suitable for ceramic grinding. In particular, while the nano-ceramic bonded CBN wheel grinding wheel realize ductile grinding of ceramic its performance is close to the diamond grinding wheel. Furthermore, it has a wider range of adaptability than the diamond wheel.5. The workpiece surface quality after grinding by nano-vitrified bond CBN grinding wheel was researched. The experimental results showed that the characteristics effect surface quality after grinding by the nano-vitrified bond CBN wheel is similar to the ordinary super-high speed vitrified bond CBN grinding wheel, but the grinding workpiece surface integrity and quality are much better than ordinary wheel.6. The SPH method used to simulation characteristics of nano-vitrified bond CBN grinding wheel’s abrasive abrasion wear. In addition, compared the nano-vitrified bond CBN grinding wheel with ordinary CBN wheel in its wearing and dressing experiments, it found that the proportion of abrasive abrasion wear of nano-vitrified bond CBN grinding wheel is greater than the others. |
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