Abstract
The application of ultra-precision shaft parts is widely used, such as the spindle core of the air bearing spindle in ultra-precision machine tools. The precision of the spindle core is extremely high, and it is very difficult to obtain directly by traditional Computer Numerical Control (CNC) machine tools but is mostly obtained by manual grinding, whose machining efficiency is greatly limited. Based on the deterministic figuring theory, this paper focuses on the ultra-precision roundness, optimizing the filtering parameters of the measurement error data and studying the generation mechanism of the removal function morphology; the shape of the removal function is adjusted by combining the analysis of the figuring ability and positioning error. Finally, the optimized removal function is used on an experimental steel shaft, the average roundness convergence ratio is 72% higher than that of the original removal function, and the roundness reaches a 0.1 μm level. The result shows that a reasonable filtering of measured data and the removal function adjusted for the surface feature can improve the efficiency and precision of deterministic figuring on shaft parts.
Highlights
The rapid development of the aerospace industry, precision optics, precision instruments, medical machinery and other fields requires the support of ultra-precision machining technology
As one of the core components of ultra precision machine tools, the air bearing spindle has the advantages of small friction resistance, high rotation accuracy, low vibration and noise, and has been widely used in the field of ultra precision machining and measurement [2]
Reducing the RONt and cylindricity error (CYLt) of the spindle core is very important for improving the spindle rotation accuracy of ultra-precision machine tools
Summary
The rapid development of the aerospace industry, precision optics, precision instruments, medical machinery and other fields requires the support of ultra-precision machining technology. The roundness error (RONt) and the cylindricity error (CYLt) of the journal on the spindle core are the main factors affecting the spindle’s rotation accuracy [3,4]. Reducing the RONt and CYLt of the spindle core is very important for improving the spindle rotation accuracy of ultra-precision machine tools.
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