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In this paper, frequency is regarded as a new characteristic parameter to analyze vibration features. Firstly, the principle of vibration signal feature extraction was proposed, and the characteristic frequency function was obtained through the vibration feature extraction test of quick-point grinding. Then, the influence of different levels of technological parameters on grinding vibration under the machining or idle condition was analyzed. And the variation law of characteristic frequency was analyzed by comparing the contact and energy transfer relationship between the grinding wheel and workpiece. The results showed that the machining characteristic frequency is always smaller than the idle and the relative deviation of characteristic frequency decreases with the increase of the grinding wheel ' s linear velocity, and increases with the increase of grinding depth and feed velocity. At the same time, the influence weight of each technological parameter on the characteristic frequency was compared, and the idea of improving the machining efficiency was put forward. [ABSTRACT FROM AUTHOR]

To investigate the grinding surface quality of unidirection carbon fiber-reinforced ceramic matrix composites(Cf/SiC)， the orthogonal experiments were carried out by using resin-bonded diamond grinding wheel. In order to achieve the influence order of grinding wheel linear speed， grinding depth and feed speed on grinding surface quality， range analysis was adopted in this paper. The results indicate that: the grinding depth has maximum impact on the machining surface roughness; as the raises of grinding depth， the grinding surface roughness increases; as the raises of grinding wheel linear speed， the grinding surface roughness decreases; as the raises of feed speed， the grinding surface roughness increases. According to the result of orthogonal experiments， the best combination of grinding parameters was achieved. Based on the experiment results and surface topography， the grinding mechanisms of unidirection Cf/SiC were further analyzed， which supplies some useful technical reference for revaling the grinding mechanisms of unidirection Cf/SiC. [ABSTRACT FROM AUTHOR]

The wheel-workpiece contact zone is changed due to point grinding inclining angle α and novel grinding wheel with coarse grinding area angle θ. It changes from line contact into point contact in theory and the grinding zone temperature is also changed. In this paper，the grinding zone temperature is simulated by the finite element method. The orthogonal experiments L16(45)was designed and thermocouple measurement was used for grinding experiments. Through range analysis， primary and secondary factors affecting grinding temperature is that coarse grinding area angle θ>cutting depth a○p>inclining angle α>axial feeding speed vf>grinding wheel speed vs. The optimum parameters combination of reducing the grinding zone temperature is that θ(20°)， ap(0.01mm)，α(1°)，vf(0.6mm/min)，vs(35m/s). Finally，by means of single factor experiments， the correctness of the simulation was verified and the influence of each parameter on grinding zone temperature was deeply analyzed. [ABSTRACT FROM AUTHOR]