Abstract
Hydrostatic thrust bearings are the core part of the hydrostatic spindle, which is widely used in high precision grinding machines. In this paper, the viscosity-temperature (v-t) characteristics of hydrostatic oil are systematically investigated, which is essential for improving the performance of the hydrostatic thrust bearing and the spindle working at high pressure and high rotational speed. Based on the computational fluid dynamics (CFD) simulation developed, the performance variation rules of thrust bearing surface are established while changing the oil supply pressure. It is found that the bearing capacity and temperature are obviously affected by varying viscosity-temperature characteristics, which have significant fluctuation phenomenon at the orifice. Furthermore, the turbulence intensity of the taper hole is found the least factor by analyzing four kinds of commonly used orifice type configurations. Finally, comparing the simulation and experimental results, the v-t model developed is proofed well matching with the experiment. The model can provide a basis for accurate design and analysis of hydrostatic thrust bearings and consequently the effective design and analysis of the hydrostatic spindle for high precision grinding machine.
Highlights
High precision internal grinding machines are widely used in automotive, optics, aerospace, and electronics manufacturing industries [1,2]
This paper presents the design analysis and simulation development on hydrostatic bearings and the supported spindle applied to a high precision internal grinding machine
In order to improve the performance of hydrostatic thrust bearings, it is necessary to calculate and discuss the influence of varied the working condition and the size of the orifice shape on the hydrostatic thrust bearing performance under the change of viscosity with temperature
Summary
High precision internal grinding machines are widely used in automotive, optics, aerospace, and electronics manufacturing industries [1,2]. High dynamic stiffness and a high precision micro-feeding of the machine system are essential for maintaining the relative positioning and engagement between the fine abrasive tools and workpieces [5]. The traditional processing method generally drives the workpiece and grinding wheel relative rotational motions by the high speed main spindle rotation, to remove the grinding grain by shearing and squeezing action, which has some drawbacks, including control difficulty, low dressing accuracy, and a high wear loss of the grinding wheel [6,7]. In order to achieve high precision processing and the surface quality of ultraprecision machining, the high precision spindles with high speed and high rigidity have attracted the attention of many machine tools manufacturers and precision engineering researchers
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