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Thermal effect on the dynamic error of a high-precision worktable

Zou H., Wang B.

Archives of Civil and Mechanical Engineering

2017

Vol. 17, no. 2

336--343

This paper investigates the thermal effect on the dynamic error of a high-precision machine worktable during operation. The thermo-mechanical model was established to obtain the motion errors of the worktable by considering the combined effects of varying internal heat sources and external thermal drifts. The temperature tests were performed to obtain the initial conditions of the model and provide a verification for the analytical convection coefficients and heat flux, which were obtained by inverse analysis. The predicted yawing errors of the worktable were confirmed by interferometer tests. Numerical and experimental results suggest that the environmental temperature fluctuation is the largest contributor to the motion errors of the worktable, and they increase with the increasing of environmental temperature. This study allows deeper insights into the underlying mechanisms that result in the motion accuracy variations of the worktable due to the thermal effects, which can provide a strategy for manufacture to further compensate the thermal error and realize ultra precision.

Research on the Effect of Reinforcing Plate on Thermal Deformation Field of Hydrostatic Bearing Worktable

Xu X., Shao J., Wang Y., Zhang Y., Yang X., Yu X.

Przegląd Elektrotechniczny

2013

R. 89, nr 3b

125--127

Firstly, carry on numerical simulations for thermal deformation field of studied worktable by using software ANSYS WORKBENCH; then take study of the reasons why it will produce such thermal deformation by analyzing simulation results; finally, bring forward the measure of adding circumferential reinforcing plates, which could improve the homogenization of temperature field, decrease thermal deformation and increase processing precision.

W artykule opisano badania dotyczące deformacji termicznej stołu roboczego. Symulacje przeprowadzono przy pomocy programu ANSYS WORKBENCH. Na podstawie analiz, wyznaczono rozwiązanie problemu, w postaci płytek wzmacniających, dzięki którym następuje ujednorodnienie rozkładu temperatury i zmniejszenie deformacji.