Oil pocket’s bearing capacity analysis of liquid hydrostatic worktable in Gantry Moving Milling Center

Zhao, Jianhua; Liang, Yingna; Gao, Dianrong

doi:10.3901/cjme.2014.0728.129

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The results indicated that with increasing rotary table rotational speed, the pressure of the oil recess remained unchanged, while its temperature gradually increased. In 2014, Zhao et al [10] analyzed the bearing capacity of the oil pocket with and without the mass offset of the hydrostatic worktable of a gantry moving milling center. Zhang [11] studied the parameters of the slide table of a heavy-duty CNC floor-type boring machine with a constant-pressure oil supply system.…”

Section: Introductionmentioning

confidence: 99%

Thrust-Bearing Layout Design of a Large-Sized Hydrostatic Rotary Table to Withstand Eccentric Loads for Horizontal Boring Machine Applications

Huang¹,

Yang²

2022

Lubricants

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There is an increasing demand for large-sized hydrostatic rotary tables due to the industrial need for the precision machining of large workpieces for wind generation, aerospace, shipbuilding, and national defense applications. As a consequence, under eccentric loads, the deformation of the large-sized hydrostatic rotary table of a horizontal boring machine would negatively affect machining precision. Indeed, the hydrostatic thrust-bearing recess layout design is the main factor that affects the rotary table’s resistance against deformations caused by eccentric loads. This study focused on the capillary-compensated constant-pressure large-sized hydrostatic rotary table for a horizontal boring machine. ANSYS software was used to simulate the thermal and structural deformation of the worktable under eccentric loads. In addition to the original layout of the hydrostatic thrust bearing, three other bearing recess layouts, which involved two different recess diameters, were designed in order to examine the deformation of the worktable under eccentric loads. The results showed that, in terms of a single-ring hydrostatic thrust-bearing layout, a larger recess diameter resulted in a smaller worktable deformation compared to a smaller recess diameter; in terms of a dual-ring hydrostatic thrust bearing layout, the worktable deformation was smaller than that of the single-ring layout with a larger recess diameter. Under the spatial and geometric constraints of the worktable, adopting a hydrostatic thrust bearing with a dual-ring recess layout would minimize the worktable deformation under eccentric loads. For thermal deformation in a single-ring hydrostatic bearing pad layout, however, a larger recess diameter resulted in a larger worktable thermal deformation compared to a smaller recess diameter.

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Section: Introductionmentioning

confidence: 99%

Thrust-Bearing Layout Design of a Large-Sized Hydrostatic Rotary Table to Withstand Eccentric Loads for Horizontal Boring Machine Applications

Huang¹,

Yang²

2022

Lubricants

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show abstract

“…However, they are not applicable to constant flow liquid hydrostatic rotary tables for off-load conditions. Zhao, J. et al [25] studied the effect of machining and assembly tolerances on the performance of the turntable. The hydrostatic oil film is assumed as the elastomer in this paper; the load-bearing capacity of oil pockets with table mass offset was studied.…”

Section: Introductionmentioning

confidence: 99%

Analytical Research on the Bearing Characteristics of Oil Film Supplied with Constant Oil Flow Hydrostatic Turntables under Fixed Eccentric Load Condition

Wang

Zhang

et al. 2022

Processes

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This study was initiated in view of the phenomenon that hydrostatic turntable rails are prone to scrape damage when the liquid hydrostatic turntable is running under fixed partial load. The existing bias-load hydrostatic turntable oil film bearing characteristics are mainly calculated by using the calculus integration method and CFD fluid simulation method. The calculating formula obtained by the calculus integration method is complex and inefficient. The CFD fluid simulation calculation method requires 3D modeling and meshing of the oil film, which is a tedious and time-consuming process and may not yield convergent calculation results due to improper meshing methods or boundary condition settings. In order to solve the shortage of the above calculation methods, this paper simplifies and equates the uneven thickness of the oil film of each sealing edge of the oil pad of the bias-loaded hydrostatic rotary table to the equivalent uniform thickness of the oil film, and based on this idea, the analytical calculation formula of the oil film bearing capacity, bending moment and stiffness under constant bias-load conditions of the constant-flow liquid hydrostatic rotary table is derived. In this paper, Fluent software was used to numerically simulate the oil film under this working condition, and a hydrostatic turntable test bench was established to conduct an experimental study on the biased load hydrostatic turntable; the experimental data and simulation results were compared with the results obtained from this simplified method of calculating the oil film loading characteristics. The results show that the error of oil film bearing capacity is less than 6% and the error of overturning moment is less than 7%, which has verified the validity of the calculation method. The simplified analytical calculation method proposed in this paper is used to study the influence of tilt displacement rate, lubricant flow rate and turntable speed on the basic performance parameters of oil film, which provides a theoretical basis for the study of oil film load-bearing characteristics under constant bias-load conditions of the constant-flow liquid hydrostatic turntable.

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“…The bearing capacity and static stiffness are the most important indexes which directly affect machining precision [1]. Under heavy load condition, the insufficient of bearing capacity and stiffness of hydrostatic guide‐way has become the bottleneck of the development of heavy CNC machine tools [2–4]. Therefore, it is a key problem to be solved to increase the bearing capacity and static stiffness of the guide‐way in order to improve the machining precision of the heavy CNC machine tools.…”

Section: Introductionmentioning

confidence: 99%

Influence of liquid film thickness on bearing characteristics of magnetic‐liquid suspension guide‐way

Zhao

Zhang

Chen

et al. 2018

J. eng.

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Oil pocket’s bearing capacity analysis of liquid hydrostatic worktable in Gantry Moving Milling Center

Cited by 7 publications

References 11 publications

Thrust-Bearing Layout Design of a Large-Sized Hydrostatic Rotary Table to Withstand Eccentric Loads for Horizontal Boring Machine Applications

Thrust-Bearing Layout Design of a Large-Sized Hydrostatic Rotary Table to Withstand Eccentric Loads for Horizontal Boring Machine Applications

Analytical Research on the Bearing Characteristics of Oil Film Supplied with Constant Oil Flow Hydrostatic Turntables under Fixed Eccentric Load Condition

Influence of liquid film thickness on bearing characteristics of magnetic‐liquid suspension guide‐way

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