以流量控制靜壓軸承等膜厚之探討

張協興

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以流量控制靜壓軸承等膜厚之探討

Study in Flow Control for Constant Film of Hydrostatic Bearing

張協興 , Masters　　Advisor：康淵;張永鵬　　

繁體中文

油靜壓軸承；定量泵；流量控制；等膜厚； hydrostatic bearing ； quantitative pump ； flow control ； constant film

Abstract │ Reference (27) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Hydrostatic bearings are used in tool spindle, working head, linear guides, lead screw, rotary table slideway, worm-gear and worm-rack, where the spindle or worktable is supported by the external pressurized lubricant film. As a hydrostatic bearing which provides greater load capacity, higher stiffness and vibration damping than rolling bearings and air bearings, and has lower friction coefficient, greater accuracy and longer life than the hard guides, its rotation accuracy is better than hydrodynamic bearings and zero torque starting capacity. However, there are still innate advantages of hydrostatic bearings did not been developed. Basically, the hydrostatic bearings have the same drawbacks as the hard guides, rolling bearings, hydrodynamic bearings and air bearings, including decreases in the film thickness and stiffness with increased load, and non-uniform load causes the worktable or spindle tilt, and the lubricant viscosity varies with temperature change make the lubricant flow change and further more cause the film thickness changed, and the reaction for resisting to dynamic loads is too slow decreasing the accuracy. Therefore, this project proposes to establish the identification methods, calibration methods and control method to keep constant film thickness for hydrostatic bearing systems and level of worktable. The design of hydrostatic bearing system will be applying the analytical methods to establish bearing geometry, restrictor type and geometry and the physical parameters of the hydrostatic bearing system by according to the required bearing characteristics. But there are some differences between the actual bearing characteristic parameters after manufactured and assembled and the design features. In this paper, hydrostatic bearing oil film thickness does not change and the whole oil film uniform as the goal, to discuss the control of the displacement pump speed control to solve the film thickness uneven and the thickness of the load with the variable to the closed bearing work platform four Point of the displacement and eight oil sills pressure, flow, motor speed as a feedback signal, and the establishment of hydrostatic bearing control method, according to the design of the overall control loop to keep the work table stability. In this paper, the LabView software is used to establish the human-machine interface of sensing and control, to calculate the feedback and control the flow, to achieve equal thickness control.

Reference ( 27 ) 〈TOP〉

1.Heller, Stanley, and Wibur Shaprio, “A Numerical Solution for the Incompressible Hybrid JournalBearing With Cavitation” Journal of Lubrication Technology, Transactions of the ASME, Vol. 91, No.3, pp.508-515 (1969).
連結：
2.O’Donoghue, J. P., Rowe, W. B., and Hooke, C. J., “Design of Hydrostatic Using An OperatingParameter,” Wear, Vol. 14, pp.355-362 (1969).
連結：
3.Rowe, W. B., O’Donoghue, J. P., and Cameron, A., “Optimization of Externally Pressurized Bearingsfor Minimum Power and Low Temperature Rise,” Tribology, Vol. 3, No. 3, pp.153-157 (1970).
連結：
4.Ghosh, B., “An Exact Analysis of a Hydrostatic Journal Bearing With a Large Circumferential Sill,”Wear, Vol. 21, pp.367-375 (1972).
連結：
5.Ghosh, B., “Load And Flow Characteristics of Capillary-Compensated Hydrostatic Journal Bearing,”Wear Vol. 23, pp.377-386 (1973).
連結：

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