Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 450-457.doi: 10.13229/j.cnki.jdxbgxb20190998

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High⁃speed characteristics of micro⁃beveled heavy duty hydrostatic bearing lubricant oil film

Yan-qin ZHANG1,2(),Yi LUO1,Shi-qian NI3(),Ru-kang WU2,Zhi-quan ZHANG4   

  1. 1.College of Mechanical Engineering，Nanjing Institute of Technology，Nanjing 211167，China
    2.Yanshan University & Nanjing Institute of Technology Joint Research Institute，Nanjing Institute of Technology，Nanjing 211167，China
    3.Nanjing Vocational Institute of Transport Technology，Nanjing 211188，China
    4.School of Mechanical Power Engineering，Harbin University of Science and Technology，Harbin 150080，China
  • Received:2019-11-02 Online:2021-03-01 Published:2021-02-09
  • Contact: Shi-qian NI E-mail:yanqin.zhang@njit.edu.cn;nsqmoney@163.com

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Abstract:

For large size hydrostatic bearings in heavy equipment manufacturing， it is easy to cause lubrication failure when running at high speed. In this paper， the lubrication performance of wedge oil film for hydrostatic bearing is studied under variable viscosity and high speed operation. Based on lubrication theory of bearings， the flow rate equation， the hydrostatic bearing capacity equation and the dynamic pressure bearing capacity equation of micro-beveled rectangular cavity affected by different speed and angle are deduced. CFD and FLUENT are used to simulate the oil film lubrication performance of bearings at higher speeds of 100 r/min， 120 r/min， 140 r/min， 160 r/min， 180 r/min and 200 r/min， respectively. The comprehensive influence law of oil cavity pressure， fluid velocity， vorticity and flow rate is revealed under the influence of higher speed changes. Finally， the oil film pressure field affected by higher speeds is tested under certain wedge height and higher speed， which verifies the theoretical analysis and simulation. It is found that hydrostatic failure of flat oil pad is very obvious at high speed. The micro-bevel oil pad can compensate the hydrostatic loss by the high-speed operation of the hydrostatic bearing. The dynamic pressure compensation range of the bearing is 16%~30%. The experimental and numerical simulation results of bearing operation have a good consistency at higher speeds.

Key words: heavy-duty hydrostatic bearing, lubrication failure, compensate, micro-beveled, dynamic pressure

CLC Number: 

  • TH122

Fig.1

Double rectangular cavity hydrostatic circular guide"

Table 1

Structureparameters of bearing"

参数数值参数数值
转台自重/t9.85油腔长度/mm300
最大工件重/t32油腔宽度/mm190
转台直径/mm4500进油孔直径/mm15
转速范围/(r·min-1)1~200油腔深度/mm3
油垫个数12初始油膜厚度/mm0.1
液压油牌号32#四周封油边宽度/mm11
液压油黏度/（Pa?s）0.045导轨内半径/mm692.5
液压油密度/(kg·m-3)880导轨外半径/mm975

Fig.2

Double rectangular cavity structure dimension"

Fig.3

Dynamic pressure oil wedge pressure profile"

Fig.4

Grid model"

Fig.5

Pressure field under Δh 0.06 mm at 180 r/min"

Fig.6

Pressuredistribution under Δh 0.06 mm at 180 r/min"

Fig.7

Average pressure value of different oil wedge heights under load of 20 t at high rotation speed"

Table 2

Static pressure failure of plane oil pad bearing under different rotating speed at 20 t"

转速/(r·min-1)失效率/%
10017.3
12017.8
14018.7
16019.7
18021.1
20022.2

Table 3

Dynamic pressure compensation rate under different rotating speed at 20 t"

转速/

(r·min-1)

Δh/mm
0.020.040.060.080.10
10010.5613.7816.8716.2915.21
12011.5016.3220.1921.1521.65
14011.7817.5421.9623.6124.82
16012.2918.6523.7725.8727.78
18014.0920.3326.4328.7031.01
20015.6722.6728.4931.9134.65

Fig.8

Flow field under Δh 0.06 mm at 180 r/min"

Fig.9

Relationbetween mass flow and rotation speeds at different oil wedge heights"

Fig.10

Experimental main device"

Fig.11

Schematic diagram of pressure sensor layout"

Fig.12

Pressure test values at different speeds of load 12 t"

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