Abstract: Nano-scale surface of low roughness can be obtained in single point diamond ultra-precision machining. Further experiments show that clear embossed grain boundary will appear on the machined surface filled with tool marks when annealed oxygen-free copper cut by single point diamond ultra-precision machining. Ultra-precision machined surface′s microtopography with embossed grain boundary can not be effectively characterized and distinguished with traditional concept of roughness. In this work, the concept of fractal dimension was introduced and yard stick method was used to calculate fractal dimension of surface microtopography of ultra-precision machined oxygen-free copper. In order to reduce interference of tool marks signal and extrude information of embossed grain boundary, band-stop filter method was designed. The results showed that the surface fractal dimension and embossed grain boundary could be obtained on the surface after ultra-precision machining, but due to the similar size scale, the difference could not be distinguished by traditional roughness measurement. By coupling band-stop filtering and yard stick method, the feature of embossed grain boundary could be effectively identified, and which could reflect the microscopic, characteristic information of ultra-precision machined surface′s topography quantitatively.
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2017, Vol. 31 
