Rotordynamics of an Improved Face-Grinding Spindle: Rotational Stiffness of Thrust Bearing Increases Radial Stiffness of Spindle

Lin, Shengye; Jiang, Shuyun

doi:10.1115/1.4053458

Cited by 7 publications

(3 citation statements)

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“…Spindle nose stiffness is a key technical indicator of machine tool spindle, and stiffness design is an important task for the machine tool spindle design [1][2][3]. Fluid bearings have been widely applied in the field of machine tool spindle due to their high precision, good rigidity and long service life [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Theoretical Approach for Stiffness of Machine Tool Spindle with Fluid Bearings

Xu¹,

Huang²,

Jiang³

2023

Preprint

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Machine tool spindle stiffness is a leading technical indicatoraffecting cutting ability. However, the stiffness of the machine tool spindle with fluid bearings has not been studied thoroughly. This paper proposes a new methodology for the spindle stiffness with fluid bearing including definition of the spindle nose stiffness, experimental method and calculation method for this stiffness. A motorized spindle with hydrodynamic water-lubricated spiral groove bearings developed in our laboratory is selected as an object, a theoretical and experimental investigation on the spindle nose stiffness is conducted. The result shows that the proposed experimental method can be utilized to measure the nose stiffness of spindle with the fluid bearings, meanwhile, the spindle stiffness can be obtained by simultaneously solving the rotor dynamic model and the fluid bearing dynamic model. The fluid bearing spindle stiffness depends strongly on the rotary speed and the external load. We expect an improvement for the experimental device by introducing another load device to apply a perturbation load with an any angle to the external load on the spindle nose.

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Section: Introductionmentioning

confidence: 99%

An Experimental and Theoretical Approach for Stiffness of Machine Tool Spindle with Fluid Bearings

Xu¹,

Huang²,

Jiang³

2023

Preprint

Self Cite

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“…Shyu SH studied the effects of plane slider bearings, Rayleigh step bearings, and micro grooved parallel slider bearings on oil film lubrication performance [5]. The combined bearing composed of the water-lubricated hydrostatic thrust bearing and two kinds of radial rolling bearings developed by Lin Shengye has the technical advantages of large axial bearing capacity, small friction power loss, and low-temperature rise [6]. Kodnyanko V has carried out mathematical modeling and theoretical research on the steady and unsteady working modes of adaptive thrust bearing [7].…”

Section: Introductionmentioning

confidence: 99%

Research on the dynamic pressure effect of clearance oil film of stepped hydrostatic thrust bearing

Feng

Jiang

et al. 2023

Preprint

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The dynamic pressure effect of the clearance oil film of stepped hydrostatic thrust bearing is studied by taking the double rectangular cavity oil cushion as an example. According to the hydrodynamics theory, the average dynamic pressure of lubricating oil film in different clearance height regions is theoretically deduced and calculated, and the dynamic pressure effect of the clearance oil film in the stepped hydrostatic thrust bearing is studied through the combination of theoretical calculation, simulation, and experimental verification. It is found that the theoretical value of the average dynamic pressure of the clearance oil film and the rotational speed show a linear growth relationship with a slope of 275.2. The simulated value of the average dynamic pressure and the rotational speed follow the growth law of the Fourier 1 model. The experimental value of the average dynamic pressure is between the theoretical value and the simulated value, which is basically not affected by the load. In the speed range of 0r/min-200r/min, compared with the viscosity of lubricating oil, the speed is the main factor affecting the dynamic pressure of the oil film of the stepped hydrostatic thrust bearing. The dynamic pressure value of the clearance oil film increases in a stepped fashion along the radial direction of the double rectangular cavity oil cushion. The dynamic pressure value has an obvious upward trend at the junction of the circumferential right oil cavity and the sealing edge and then decreases to 0 after reaching the peak value.

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“…Guan et al [2] used Timoshenko beam theory and Hamilton's principle to establish a dynamic model with centrifugal force, and then explored the influence of centrifugal force on the model by numerical simulation. Lin [3] considered the centrifugal force of bearing balls and established a dynamic model of the spindle rotor via using the transfer matrix method. Shi [4] considered the centrifugal force and gyroscopic effects and modeled the spindle-bearing system by using a finite element method based on the Timoshenko beam theory.…”

Section: Introductionmentioning

confidence: 99%

Stability prediction of micro-milling with tool runout and centrifugal force via using FEM and time-domain formulation

Liu,

Du,

Liu

et al. 2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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Micro-milling is one of important methods for producing miniature components with high-accuracy. During the cutting process, the chatter vibration which can result in instability and poor surface finish may considerably be disturbed by the unpredictable tool runout and centrifugal force with ultra high speeds of micro-mill. This paper tries to develop a time domain dynamic model for depicting chatter vibration of micro-mill with the concerns of tool runout incorporated in cutting forces and centrifugal force included in external force work via combing FEM and time-domain formulation. Several simulations carried out illustrates the validity of the proposed model from the perspectives of FRF, SLD and time domain response.

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Rotordynamics of an Improved Face-Grinding Spindle: Rotational Stiffness of Thrust Bearing Increases Radial Stiffness of Spindle

Cited by 7 publications

References 0 publications

An Experimental and Theoretical Approach for Stiffness of Machine Tool Spindle with Fluid Bearings

An Experimental and Theoretical Approach for Stiffness of Machine Tool Spindle with Fluid Bearings

Research on the dynamic pressure effect of clearance oil film of stepped hydrostatic thrust bearing

Stability prediction of micro-milling with tool runout and centrifugal force via using FEM and time-domain formulation

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