Abstract
Abstract The sequential ball burnishing and ball polishing processes have been applied successfully to the ultra-precision surface finish of the NAK80 mould tool steel on a CNC machining centre. The optimal flat surface polishing parameters of the developed system for the NAK80 mould tool steel have been determined by conducting the experiments of the Taguchi's L 18 orthogonal table, analysis of variation (ANOVA), and the full factorial experiments. The burnished surface roughness of the test specimens can be improved from about R a 0.06 μm to 0.016 μm in average using the determined optimal polishing parameters. Applying the optimal flat surface ball burnishing and ball polishing parameters sequentially to a fine milled spherical lens mould cavity of NAK80 mould tool steel, the surface roughness R a of the surface on the tested parts can be improved sequentially from about 1.0 μm in average to 0.020 μm in average.
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