Study on Pressure and Flow Characteristics of Hydrostatic Spindle of High-Speed Gear Shaping Machine Based on Working Conditions
The lubrication characteristics of the hydrostatic spindle of the high-speed gear shaping machine are not clear under the actual working conditions,based on the theory of tribology and fluid dynamics,the lubrication characteristics of the hydrostatic spindle of the high-speed gear shaping machine are investigated by finite element simulation based on the actual working parameters.The results show that the larger radial load,the higher the oil film bearing capacity,the maximum deformation of the spindle sleeve and the vis-cous resistance,while the oil film stiffness decreases and then increases with the increase of eccentricity.The maximum deformation position of the sleeve gradually transitions from the center of the oil sealing sur-face to the center of the oil sealing cavity and a small part of the oil sealing surface with the increase of ec-centricity.Under the same eccentricity condition,the stroke speed has no effect on the oil film load carrying capacity,and the viscous resistance of oil film increases with the increase of stroke speed and the increase of eccentricity.Increasing the oil supply pressure can significantly increase the oil film stiffness and load carrying capacity,but the maximum deformation of the sleeve also increases significantly.Increasing the oil supply pressure has no effect on the viscous resistance,but it will change the oil flow direction and increase the viscous shear stress concentration of the oil film,which may lead to the rupture of the oil film and lubri-cation failure in the stress concentration area.The study can provide some reference for the optimization of hydrostatic spindle process parameters of high-speed gear shaping machine.
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