Fabrication of Boron-Doped Large Single-Crystal Diamond and Investigation of Online Cutting Temperature Detection for Diamond Tools
To enable real-time measurement of the cutting temperature in the cutting zone of single-crystal diamond tools and real-time monitoring of the surface quality of workpieces during ultra-precision machining with diamond tools,the semiconductor properties of boron-doped diamond were leveraged.The relationship between electrical resistance and temperature was established,revealing a measurement sensitivity of 6.2 Ω/℃.The developed boron-doped single point diamond tools were deployed on a diamond turning machine to measure the cutting temperatures during single point diamond turning(SPDT)of polymethyl methacrylate(PMMA)and carbon fiber reinforced polymer(CFRP)workpieces.The experiments validated that the boron-doped diamond tool cutting temperature measurement system could sensitively measure the cutting temperature throughout the precision machining process.Notably,during the cutting of CFRP workpieces,periodic variations in both cutting temperature and machined surface topography were observed.This finding holds significant value for guiding online monitoring of the ultra-precision machining state when employing single point diamond tools.
boron-doped large single crystal diamondhigh temperature and high pressuresingle-point diamond toolultra-precision machining
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