Relationship between geometric errors of thrust plates and error motions of hydrostatic thrust bearings under quasi-static condition |
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Affiliation: | 1. Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China;3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China;2. State Key Lab of Digital Manufacturing Equipment & Technology, Huazhong University of Science & Technology, Wuhan 430074, PR China |
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Abstract: | A new model using approximate formulas is established to predict the error motions of hydrostatic thrust bearings. Three different types of geometric errors of thrust plates are listed in this paper including tilt errors, saddle shaped errors and petal shaped errors. The influences of them on lateral tilt error motion, longitudinal tilt error motion and axial error motion are discussed. Definitions of averaging coefficients are made based on the approximate formulas. It is found that the time-varying tilt errors are the main reason for the error motions of hydrostatic thrust bearings. The thrust bearings with six pairs of recesses have priority over the thrust bearings with four and three pairs of recesses in the view of rotation accuracy. Experiments are done using a hydrostatic rotary table with an outer diameter of 2 m. It is found that the second harmonic errors are the main component of the radial run-out and the results agree well with the results calculated from the approximate formulas. |
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Keywords: | Approximate formulas Error averaging effect Error motions Geometric errors Hydrostatic thrust bearings |
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