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International Journal of Abrasive Technology (2 papers in press)
Polishing investigation on zirconia ceramics using magnetic compound fluid (MCF) slurry by Feng Ming, Wang Youliang, Bitou Teruo, Nomura Mitsuyoshi, Fujii Tatsuya, Wu Yongbo Abstract: Zirconia ceramics have wide applications in the fields of aerospace, defense industry, new energy, automotive, electronics and biomedical. Although the conventional methods can fabricate zirconia ceramics products efficiently, the induced scratches, micro-cracks and sub-damage are inevitable. Therefore, the post-polishing processing should be employed. The magnetic-assisted polishing with MCF slurry is considered as a friendly polishing method which can not only achieve smooth surface but also reduce the defects remained at the work-piece surface. However, the investigations on the high precision polishing of zirconia ceramics by using the MCF slurry were not conducted so far. In this work, the polishing method by using magnetic compound fluid (MCF) slurry under the rotary magnetic field was proposed for the zirconia ceramics polishing. The principle and the constructed experimental setup were presented at first. Then, the spot polishing was conducted. Finally, the effect of parameters, including working gap h, MCF carrier revolution speed nc, abrasive particles (APs) size, the concentration of carbon iron particles (CIP) and concentration of ?-cellulose on the finishing of work surface was investigated. The polishing results show that surface roughness Ra 5 nm was obtained at the surface of zirconia ceramics with 0.5 mm of h, 400 rpm of nc, ?1.25 ?m of abrasive particle, 45 wt.% of CIP concentration and 3 wt.% of ?-cellulose concentration. Keywords: MCF slurry; Rotary magnetic field; Zirconia ceramics; Polishing; Precision.
A New Method of Real Time Monitoring of Cutting Tool Status bases on HHT by Qzheng Liu, Guoqiang Guo, Zichao Lin Abstract: The machine tool is the main execution unit in the Cyber-Physical system (CPS system), which can improve the product quality by dynamic monitoring and real-time perception of its wear status. In order to realize the on-line signal acquisition and monitoring of tool wear status, the spindle power signal acquisition system was implemented. The cutting force signal is used as contrast analysis. The HHT method and wavelet transform method are introduced to construct the tool wear coefficients, which are corresponding to the tool wear status. Compared with the wavelet transform, it is proved that Hilbert-Huang transform can restrain the noise signal effectively and improve the accuracy of the monitoring. Finally, the new tool wear monitoring method is applied to drilling 45# steel and titanium alloy TC4 to catch the tool wear state, and the power signal is used to carry out comprehensive online tool state monitoring. It is accurate and practical in the drilling test, which shows prospective usage in the near future. Keywords: Cyber-Physical System; Power Signal; Hilbert-Huang Transform; Tool Wear Coefficient; Wavelet Transform.