Dynamic Lubrication Characteristics of Oil Film with Variable Viscosity Hydrostatic Sliding Bearings at High Speed

doi:10.3901/JME.2019.21.108

Abstract

Abstract: Due to the larger diameter of the hydrostatic sliding bearing turntable (D=4.5 m), so the line speed is higher at high speeds. The lubricating oil film of the hydrostatic bearing is pressed and sheared, which causes the oil film to become thinner and affects the machining precision and operational reliability of the machine tool. This research method is based on the new Q1-205 double rectangular cavity hydrostatic thrust bearing, and the dynamic mesh technology is used to explore the dynamic lubrication characteristics of oil film with variable viscosity conditional at high speed. The mathematical model of flow, bearing capacity and temperature rise of double rectangular cavity is established. The UDF program is edited for controlling the movement of boundary layer grids and variable viscosity of lubricating oil, the dynamic lubrication characteristics of hydrostatic bearings is simulated under load conditions of 12 t and the high rotational speed of 80~200 r/min that the line speed is 18~48 m/s, and the experiment verified the corresponding results under the same working condition parameters. The influence laws of oil film thickness variation on oil cavity temperature, oil cavity pressure, and flow at the sealing edge under high speed conditions are revealed. It is found that the oil films generate heat and the temperature rise increases as the film thickness decreases. The hydrostatic bearing suffers serious pressure loss due to the viscosity change of the lubricant at high speed. The research data provide theoretical basis for the reliable operation of hydrostatic bearings in engineering.

Key words: hydrostatic sliding bearing, variable viscosity, lubrication characteristics, pressure loss, UDF

CLC Number:

TH133

ZHANG Yanqin, NI Shiqian, ZHANG Zhiquan, KONG Pengrui, FENG Yanan, KONG Xiangbin. Dynamic Lubrication Characteristics of Oil Film with Variable Viscosity Hydrostatic Sliding Bearings at High Speed[J]. Journal of Mechanical Engineering, 2019, 55(21): 108-117.

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