Theoretical Analysis And Experimental Research On Grinding Temperature Of Carbon Fiber Reinforced Composites

Carbon fiber reinforced plastics (CFRP), as a kind of advanced composite material, is characterized by light weight, high modulus, superior strength-to-weight and stiffhess-to-weigh ratios, low expansion coefficient, high heat resistance, good thermal shock, corrosion resistance and well vibration absorption. They have been used widely in field of airplanes, spaceships and automobile etc. However, CFRP is anisotropic and its thermal conductivity is low, which result in heat accumulation and extremely hard processing conditions. Processing temperature can not be accurately measured.This thesis is supported by the Basic Research Foundation of the Ministry of Education of China and the Natural Science Foundation of Liaoning Province. Considering the low thermal conduction and the characteristic of CFRP, this study focuses on the following points:(1) According to the heat transfer theory, a mathematical model on temperature field was established during the surface grinding process based on the structural characteristics of carbon fiber/resin composite materials. The grinding temperature field simulation program was developed by Visual Basic. Finally, the grinding temperature field of carbon fiber/resin composite materials was simulated and analyzed in the thesis. The reasonability of theoretical model was verified by comparing the simulated temperature based on the model to the experimental temperature.(2) Based on the low thermal conductivity and difficult measurement of the grinding temperature for carbon fiber/resin composite materials, an experimental system on temperature measurement was built. A self-made thermal sensor was demarcated. The variations of grinding temperature and grinding force with different technical parameters were discussed, and then the empirical formulas were constructed. According to the results of roughness and topography of the ground surface, the reasonable grinding parameter range of carbon fiber/resin composite materials was proposed.(3) In view of the processing quality of carbon/quartz ceramic composite materials, the temperature measurement experiment was carried out. The changing principles of grinding temperature and grinding force with different technical parameter were discussed, and then the empirical formulas were constructed. The reasonable grinding parameter range of carbon fiber/resin composite materials was proposed according to the results of roughness and topography of the ground surface. (4) An experimental system of temperature measurement for drilling carbon fiber/resin composite materials was built. With the newly-developed electroplated diamond abrasive core drill, "grinder replacing drill" temperature measurement experiment was carried out. The changes of drilling temperature with technical parameters were discussed, and then the drilling temperature and the surface topography using core drill were compared with that drilled by kentanium drill. It is concluded that plated diamond core drill is better than kentanium drill in terms of bore machining. Finally, the reasonable drilling parameter range of carbon fiber/resin composite materials was proposed.