Research on Hydrostatic Supporting Temperature-Rise of Heavy NC Machine Tool

Zhang, Yan Qin; Dai, Chun Xi; Shao, Jun Peng; Yang, Xiao Dong; Sun, Gui Tao

doi:10.4028/www.scientific.net/amm.274.132

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…The results of numerical calculations provided the internal flow states inside the bearing, which would help the design of the oil cavity structure of the bearing in engineering practice. [15][16][17][18][19] Whereas, along with increasing of the rotational speed of the worktable, the shearing heat and the temperature of oil film are increased, and the lubrication viscosity is decreased, and then lubricant film is ruptured in multi-pad bearings, this result even leads to dry friction or friction failure of the above bearing.…”

Section: Introductionmentioning

confidence: 99%

Velocity Characteristic on Oil Film Thickness of Multi-Pad Hydrostatic Thrust Bearing with Circular Recess

Yu¹,

Sun²,

Meng³

et al. 2015

j comput theor nanosci

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The oil film thickness of a hydrostatic bearing is an important indicator of lubrication characteristics of a multi-pad hydrostatic thrust bearing, lubrication characteristics of hydrostatic thrust bearing are affected significantly by the rotational speed of the worktable, especially under the condition of high speed and heavy loading, and its effect is more significant. A multi-pad hydrostatic thrust bearing with circular recess is taken as research objects, the relation between oil film thickness and rational speed of the worktable is deduced by using lubricating theory and tribology principle. A test rig is designed for testing the oil film thickness of the above bearing, and a proving experiment is carried out. The calculated results qualitatively agree well with the experimental data, it has been found that by increasing the rotational speed the volume flow rate of efflux from the oil recess and the shear heat of the oil recess are increased, and lubricating oil viscosity decline sharply, oil film grow thin quickly, together with bearing friction pair uneven deformation, local bearing friction pair appear boundary lubrication or dry friction, and then happen tribology failure. The study provides the basic data for the hydrostatic thrust bearing design and lubrication, and implements of the prediction of the hydrostatic thrust bearing lubrication characteristics, and reaches the purpose of reducing economic loss.

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Section: Introductionmentioning

confidence: 99%

Velocity Characteristic on Oil Film Thickness of Multi-Pad Hydrostatic Thrust Bearing with Circular Recess

Yu¹,

Sun²,

Meng³

et al. 2015

j comput theor nanosci

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“…In the study, the vertical hydrostatic guide rail was taken as the research object and the mathematical model of the oil film thickness in various cutting force was established based on summery of researches on performance of hydrostatic bearing [6][7][8][9][10][11][12][13][14]. According to the document analysis on hydrostatic bearing at home and aboard, there is less study on pressure field and the effect of rotational velocity on pressure field of heavy hydrostatic bearing with Constant Flow.…”

Section: Introductionmentioning

confidence: 99%

Rotational Velocity Influence Research on Pressure Field of Hydrostatic Bearing with Constant Flow

Dai

Shao

Zhang

et al. 2014

KEM

Self Cite

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Large size hydrostatic bearing is the core component of heavy CNC equipment. The influence of pressure, heating and running time can reduce film thickness during operation. This will directly affect machining accuracy and operation reliability of the entire machine. Aiming at the problem of influence of rotational velocity on carrying capacity of heavy hydrostatic bearing, use finite volume method (FVM) to simulate gap film pressure field of heavy hydrostatic bearing with Constant Flow and study pressure field distribution law on the conditions of the different rotational velocity and same cavity depth, oil cavity area, then optimize oil cavity structure. Results show that, pressure field distribution law of the different rotational velocity is basically identical, but its carrying capacity is different. From the relation curve of the pressure and rotational velocity can be seen, because of the dynamic pressure of existence, along with the increase of rotational velocity, carrying capacity gradually. The study is of vital theoretical significance for the improvement of machining accuracy of numerical control machine and the entire CNC equipment and provides valuable theoretical basis for the design of hydrostatic guide rail in engineering practice.

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“…They finally gave out conclusions that the value of the fluid film pressure, the value of the bearing flow, the value of the load carrying capacity, the value of stiffness coefficient of four different kinds of cavities shapes [12]. Other researchers studied the temperature field of hydrostatic thrust bearing having circular cavity and sector cavity and researched on influence of oil cavity shapes on carrying capacity of heavy hydrostatic bearing [13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Influence Research of Cavity Shapes on Temperature Field of Multi-pad Hydrostatic Thrust Bearing

Yu¹,

Zhou²,

Meng³

et al. 2014

IJCA

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Research on Hydrostatic Supporting Temperature-Rise of Heavy NC Machine Tool

Cited by 6 publications

References 5 publications

Velocity Characteristic on Oil Film Thickness of Multi-Pad Hydrostatic Thrust Bearing with Circular Recess

Velocity Characteristic on Oil Film Thickness of Multi-Pad Hydrostatic Thrust Bearing with Circular Recess

Rotational Velocity Influence Research on Pressure Field of Hydrostatic Bearing with Constant Flow

Influence Research of Cavity Shapes on Temperature Field of Multi-pad Hydrostatic Thrust Bearing

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