Investigations of the static and dynamic characteristics of the precision hydrostatic spindle with mid-thrust bearing under different loads

Fang, Chenggang; You, Wucheng; Huo, Dehong

doi:10.1177/13506501211023618

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Chen et al 12 proposed a dynamic modelling method that takes into account the pressure distribution in the bearing by integrating the flow equilibrium principle and finite-element theory, which establishes a direct correlation between the liquid film's characteristics and the dynamic performance of the spindle. Fang et al 13 investigate the static and dynamic characteristics of the precision hydrostatic spindle with a mid-thrust bearing under different working conditions.…”

Section: Introductionmentioning

confidence: 99%

Integrated design and analysis of a high-precision aerostatic spindle for internal grinding machines and its implementation perspectives

Cheng

Bai

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Aerostatic spindles are commonly employed in ultra-precision machines. The aerostatic spindle, as a critical key component for the development of industrial ultra-precision grinding machines, requires an industrial feasible precision engineering approach to robust design and optimization in order to render the high-precision spindle system. This paper presents such an approach to the design and development of aerostatic spindles and the associated digital virtual spindle systems based on multiscale modelling and analysis. Multiscale modelling and analysis combined with the virtual spindle simulation are used as the kernel of the virtual spindle system, including innovative design on the spindle system structure, fluid dynamics modelling, drive and control system, and the integration of the spindle electromechanical system, which can be used to systematically model and simulate both the static and dynamic performances of the aerostatic spindle system. Experiments are carried out to evaluate and validate the above approach and the virtual spindle simulations, which can be further utilized for the development of next-generation high-precision aerostatic spindle systems.

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Section: Introductionmentioning

confidence: 99%

Integrated design and analysis of a high-precision aerostatic spindle for internal grinding machines and its implementation perspectives

Cheng

Bai

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In recent years, many researchers have studied the mechanical characteristics of machine spindle units using the experimental methods. Fang et al [3] tested static and dynamic characteristics of the precision hydrostatic spindle with a mid-thrust bearing under different working conditions, and then studied the variation patterns in performance indices such as stiffness, damping, quasi-static position, and stability of the spindle under different working conditions. Song et al [4] studied the dynamic frequency response functions (FRFs) of the spindle-bearing system and its time-domain response under different cutting forces by establishing a dynamic model of the spindle-bearing system.…”

Section: Introductionmentioning

confidence: 99%

Thermal effect modeling of axial static stiffness of motorized spindle unit

Liu,

Xu,

Zhang

et al. 2023

Int J Adv Manuf Technol

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In order to investigate the thermal variations of axial static stiffness of motorized spindle unit, a thermal modeling method of spindle axial static stiffness is established by combining the numerical simulation technology with analytical method. Firstly, based on a thermoelastic ring cylinder model and the Hertz contact theory, the analytical model of temperature rise -axial static stiffness thermal variation effect of spindle-angular contact ball bearing system is constructed; then, the spindle structural thermal model considering its coolant heat transfer is obtained by using the finite element heat-fluid-solid coupling simulation technology, to solve temperature rises of spindle bearings. Based on them, the Bushing element is used to analyze the stiffness of the bearing assembly in the thermal-structural coupling simulation modeling of motorized spindle unit, and thus to simulate the thermal variation effects of spindle axial static stiffness. Ultimately, the variation tendencies of the spindle axial static stiffness under various thermal conditions are analyzed by using this model, and the obtained results are compared with their corresponding test data. The comparisons show that: this modeling method can accurately predict the thermal variation tendencies of axial static stiffness during spindle operations. Then the temperature rise of spindle structure can cause its axial static stiffness to harden, which is associated with the thermal increase of bearing preload. The conclusions have the guiding significance for thermal balance design and optimization of spindle structure.

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“…Chenggang Fang et al investigated how the hydrostatic bearing spindle offset affected the bearing's static and dynamic properties, and found that the spindle offset has little effect on the oil film thickness. With the increase of the cutting force, the force stiffness coefficient and moment stiffness coefficient are caused by the tilting motion of the spindle change significantly, but the z-axis direction's stiffness changes little [8].…”

mentioning

confidence: 99%

Research on static characteristics of oil pad tiltable hydrostatic thrust bearing under eccentric load

Sun

et al. 2023

Preprint

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In most parts processing, the offset load of the worktable will be caused by many factors, such as the asymmetry of the workpiece shape and the offset of the clamping position. In this paper, the oil-cushion tilting double rectangular cavity hydrostatic thrust bearing is taken as the research object, and its static characteristics under abnormal load conditions are studied. The effects of rotation speed, offset distance and load on its static features are analyzed. The results show that the influence on the oil film pressure field under the eccentric load conditions is in descending order of load, speed, and offset distance. The effect of load and speed on the oil film pressure is positively related to the offset distance. The appropriate size of the offset distance has a specific gain on the bearing capacity improvement. The influence on the oil film temperature field under the abnormal load condition is in descending order of the rotation speed, the load and the offset distance. After the offset distance increases, the effect of load on the oil film temperature slightly increases, and the oil film temperature rise is within the safe operating range of the lubricating oil.

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Investigations of the static and dynamic characteristics of the precision hydrostatic spindle with mid-thrust bearing under different loads

Cited by 6 publications

References 23 publications

Integrated design and analysis of a high-precision aerostatic spindle for internal grinding machines and its implementation perspectives

Integrated design and analysis of a high-precision aerostatic spindle for internal grinding machines and its implementation perspectives

Thermal effect modeling of axial static stiffness of motorized spindle unit

Research on static characteristics of oil pad tiltable hydrostatic thrust bearing under eccentric load

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