Analysis for Coupling Relationship of Oil Pocket under Eccentric Load in Hydrostatic Worktable

Abstract:

Article Preview

The oil pocket of the hydrostatic worktable in the modern heavy numerical control (NC) machine tools is designed under the circumstance that the working load acts equally on the oil pockets. But when the work piece is out of the rotary center of the worktable, the working load acts unequally on the oil pockets, and then the performance indexes for the oil pockets, such as acting force, oil film thickness, hydraulic damping, rated flow, are different. Based on the eccentric working load, under the circumstance that the oil pocket provides the fluid oil with constant pressure and constant flow mode, the coupling relationship between the oil pockets is analyzed, and the expression and the relatively bar graphics are presented. To achieve the machining quality and to prevent against the totally worn-out of the machine tools, it is best to adjust one oil pocket in order to keep the oil film of all oil pockets at the same thickness. While one oil pocket is adjusted, the oil pockets are intercoupling, and then the performance indexes change synchronously. According to the characteristics of the oil pocket in the hydrostatic worktable, the expression on the coupling relationship for the oil pocket is derived, then the performance indexes are analyzed qualitatively and the curves are plotted. The proposed research analyzed qualitatively the coupling relationship on the performance indexes for the constant pressure and the constant flow oil pockets separately in the worktable. It can improve the design efficiency and the accuracy with the help of the computer programs, and provides the reference for the practical engineering.

Info:

Periodical:

Edited by:

Xiong Zhou and Zhenzhen Lei

Pages:

28-34

Citation:

J. H. Zhao and D. R. Gao, "Analysis for Coupling Relationship of Oil Pocket under Eccentric Load in Hydrostatic Worktable", Applied Mechanics and Materials, Vol. 233, pp. 28-34, 2012

Online since:

November 2012

Export:

Price:

$38.00

[1] S.Y. Luo, S.L. Wang, J. Zhou, et al. Influence of number of oil-pad on performance of constant flow delivery oil hydrostatic guideway of worktable [J]. Machine Tool & Hydraulics. 2010, 38(17): 1-4.

[2] H.F. Gu, R.J. Hong. Simulation and dynamic performance analysis on rotation platform of NC machine [J]. Machine Tool & Hydraulics. 2008, 36(5): 216-219.

[3] J.G. Chen. Parametric design and steady-state analysis of rotary worktable [J]. Journal of Shanxi University of Technology (Natural Science Edition). 2010, 26(2): 6-9.

[4] S. Eiji., H.P. Chun, M. Toshimichi. Analysis and improvement of motion accuracy of hydrostatic feed table [J]. CIRP Annals - Manufacturing Technology. 2001, 50(1): 285-290.

DOI: https://doi.org/10.1016/s0007-8506(07)62123-4

[5] O. Dalane, F.F. Knudsen, S. Lset. Nonlinear coupled hydrostatics of floating conical platforms [J]. The 28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2009. 2009, (1): 793-802.

DOI: https://doi.org/10.1115/omae2009-80018

[6] Y.L. Xiong. Fundamentals of Robotics [M]. Wuhan: Huazhong University of Science and Technology Press, (2007).

[7] Teaching and Research Section of Mathematics of Tongji University. Advanced Mathematics [M]. Beijing: Higher Education Press, (2002).

[8] Q.Y. Li, N.C. Wang, D.Y. Yi. Numerical Analysis [M]. Wuhan: Huazhong University of Science and Technology Press, (2003).