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Effect of axial groove structure on performance of hydrostatic spindle of high-speed gear shaping machine
Published:2024-03-06 author:JIAO Yuze, LI Dong, QI Houjun, et al. Browse: 469 Check PDF documents
Effect of axial groove structure on performance of hydrostatic spindle of 
high-speed gear shaping machine

JIAO Yuze1,2, LI Dong1,2, QI Houjun1,3, XI Haoran1,2, XING Kan3,4
(1.College of Mechanical Engineering , Tianjin University of Technology and Education, Tianjin 300222, China; 2.Tianjin Key 
Laboratory of High-speed Cutting and Precision Machining,Tianjin 300222, China; 3.Tianjin High-end Intelligent Machine 
Tool Engineering Research Center, Tianjin 300222, China; 4.Tianjin First Machine Tool Co., Ltd., Tianjin 300385, China)

Abstract: In order to improve the performance of the hydrostatic spindle of a high-speed CNC gear shaping machine, based on the theory of tribology and hydrodynamics,the influence of the presence or absence of an axial groove on the performance of the static spindle under different working conditions was investigated by theoretical analysis and numerical simulation. Firstly, oil film fluid simulation models and fluid-solid coupling models with and without an axial groove were established. Simulation calculations were carried out based on the actual working condition parameters to investigate the influence of the presence or absence of an axial groove on the oil film bearing capacity, rigidity, shear force and maximum deformation of the axial sleeve. Then, transient calculations were carried out to analyze the influence of the structure with and without an axial groove on the phenomenon of viscous heat generation in the hydrostatic spindle oil film within ten strokes. The effects of different axial groove shapes on the oil film load carrying capacity and stiffness under the same operating conditions were investigated. Finally, the effectiveness of the finite element simulation model was confirmed by experimental data. The research results demonstrate that integrating an axial groove structure enhances the oil film's load capacity and stiffness by approximately 1.5 times, reducing viscous resistance and maintaining a stable average temperature. Sleeve deformation is 40% larger without the axial groove at low eccentricity, while the opposite holds true at high eccentricity. Moreover, the shape of the axial groove significantly affects the oil film's stiffness particularly when operating with lower eccentricity levels. This study offers valuable insights into optimizing structural parameters and facilitating the implementation of hydrostatic spindles in high-speed gear shaping machines.
Key words: hydrostatic spindle; axial groove structure; viscous heat generation; fluid-solid coupling modal; oil film bearing capacity; oil film stiffness; deformation of shaft sleeve
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