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Technical Briefs

Design of a Novel Air Bearing Workbench for Rotary Ultrasonic Drilling of Advanced Ceramics

[+] Author and Article Information
Liping Liu

Centre of MicroNano Manufacturing Technology, TianJin University, Tianjin 300072, China;Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education,  TianJin University, Tianjin 300072, Chinaliuliping_tj@163.com

Bin Lin

Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education,  TianJin University, Tianjin 300072, Chinatdlinbin@126.com

Fengzhou Fang

State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China; Centre of MicroNano Manufacturing Technology,  TianJin University, Tianjin 300072, Chinafzfang@gmail.com

J. Mech. Des 134(9), 094502 (Aug 06, 2012) (6 pages) doi:10.1115/1.4007000 History: Received July 22, 2011; Revised June 15, 2012; Published August 06, 2012; Online August 06, 2012

A novel air bearing workbench used in rotary ultrasonic drilling of advanced ceramics was designed to constantly and sensitively control the cutting force. Compared with traditional feed systems, the novel air bearing workbench features an aerostatic guide and a pneumatic actuator, so that it only overcomes the air damping when the cutting force is balanced. Thus, it can sensitively and constantly control the cutting force for rotary ultrasonic drilling of advanced ceramics. The aerostatic guide, which determines the eccentric bearing capacity and stiffness of the workbench, is the most important part. The forces applied on the aerostatic guide faces were analyzed to calculate the bearing capacity and stiffness of the workbench using varying gas film thicknesses with finite element method (FEM). Based on the result of the analysis, the best gas film thickness of the aerostatic guide was designed to be 30 μm. The real eccentric bearing capacity and stiffness of the workbench were measured. The error between experimental results and the FEM results was within 12%.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of the air bearing workbench

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Figure 2

3D model of the air bearing workbench

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Figure 3

Photograph of the workbench

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Figure 4

Selected direction of the air bearing workbench

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Figure 5

Finite element model of the gas film and the restrictors

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Figure 6

Pressure distribution of gas film

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Figure 7

Bearing capacity and stiffness of unilateral gas film under different thicknesses

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Figure 8

Bearing capacity when the unilateral gas film thickness under no load is 30 μm

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Figure 9

Bearing stiffness when the unilateral gas film thickness under no load is 30 μm

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Figure 10

Experimental equipment of measuring bearing capacities and bearing stiffness

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Figure 11

Experimental bearing capacities of the real air bearing workbench in both directions

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Figure 12

Experimental bearing stiffnesses of the real air bearing workbench in both directions

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