Transactions of Nanjing University of Aeronautics & Astronautics
Feasibility Study on Cryogenic Milling of Carbon Fiber Reinforced Silicon Carbide Composites
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Abstract:
Carbon fiber reinforced silicon carbide matrix (Cf/SiC) composites have the most potential application for high-temperature components of aerospace high-end equipment. However, high cutting temperature, rapid tool wear and severe surface damages are the main problems in dry cutting Cf/SiC composites process. The feasibility study on cryogenic milling of Cf/SiC composites using liquid nitrogen as coolant is investigated. Influences of milling parameters and coolant on temperature, cutting force, surface quality and tool wear are investigated, which is compared with dry cutting. Experimental results reveal that the cutting temperature in cryogenic milling of Cf/SiC composites is reduced by about 40%—60% compared with dry cutting. The milling force increases gradually with the increase of spindle speed, feed rate, depth and width of milling in cryogenic milling process. In addition, the machined surface quality in cryogenic milling is superior to that in dry cutting process. Fiber fracture, matrix damage and fiber matrix debonding are main material removal mechanisms. Flank face wear is the main wear form of the polycrystalline diamond(PCD) end mills. The tool life is prolonged in the cryogenic milling process because the reduced temperature inhibits the softening of Co binder and phase transition of diamond in the PCD end mills.
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Clc Number:
TH161
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