The influence of oil source pressure fluctuation on the waviness error of potassium dihydrogen phosphate in ultra-precision machining

Abstract

The performance of potassium dihydrogen phosphate optical components is very sensitive to the waviness error. The time-varying oil source pressure leads to dynamic change in the eccentricity of hydrostatic slide; waviness errors can be induced on the finished surface of potassium dihydrogen phosphate consequently. The relationship between unsteady oil source pressure and the waviness errors of potassium dihydrogen phosphate is studied in this article. A mathematical model is built to calculate the displacement of hydrostatic slide induced by unsteady oil supply pressure. Moreover, a comprehensive fluid–structure interaction model is built to consider the influence of structural deformation of slide on the pressure distribution of oil film. Experiments are carried out to verify the proposed model. The calculated results agree well with the experimental results, and it is found that the calculated results show better accuracy when fluid–structure interaction is considered, which validates the reliability of this model.

Dynamic performance analysis and quantitative evaluation for ultraprecision aerostatic spindle

“…It was further validated with mathematical solutions by Zhang et al 11 Moreover, Deng et al 12 found a kind of low-frequency waviness, who is generated by the deformation of spindle system because of air pressure fluctuations. Similarly, waviness also steams from oil pressure fluctuations stated by Gao et al 13 In particular, the dynamic performance of the flycutting machine tool contributes significantly to medium-frequency errors. In the study by Chen et al, 14 wavelet method was adopted for surface analysis.…”

Influencing Factors and Theoretical Models for the Surface Topography in Diamond Turning Process: A Review

“…They reported that the low-frequency vibration influences the surface roughness error, while the high-frequency vibration affects the figure error in fly-cutting process. Furthermore, Gao et al pointed out that the fluctuation of the oil source pressure and the flow status of the film of the aerostatic spindle will also affect the figure error in fly-cutting process [91,92].…”

Analysis of characteristics of arc shape caused by intermittent cutting force and dynamic vibration in ultra-precision cutting processes

“…He and Zong 16 described the mechanism of multi-frequency vibration on the optical performance of diamond-turned workpieces, and he used well-established two-step process technology to reduce the effect of vibration, which was experimentally proved to be highly effective. 17,18 Gao et al 19 investigated the relationship between the ripple errors of machined surfaces and oil source pressure fluctuations and demonstrated that an unsteady oil source pressure had a remarkable effect on the topography of a workpiece. Wei et al 20 theoretically and experimentally investigated the dynamic characteristics of air spindles and their effect on medium-frequency ripples in machined surface shapes.…”