Development Research of Science and Technologies in Ultra-precision Machining Field

Yuan, Julong; Zhang, Feihu; Dai, Yifan; Kang, Renke; Yang, Hui; uuml, L; Binghai,

doi:10.3901/jme.2010.15.161

Cited by 53 publications

(23 citation statements)

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“…Due to their high precision, near-zero friction, no pollution and satisfactory thermal stability, aerostatic bearings have been widely used in precision manufacturing equipment and ultra-precision positioning and measuring instruments. [1][2][3] Due to the high-precision requirements in precision manufacturing and measurement, the previously neglected factors that affected the performance of aerostatic bearings have been gradually considered. [4][5][6] The main challenges that are encountered in increasing the stability and accuracy of aerostatic bearings are the fluctuation and microvibration of the flow field.…”

Section: Introductionmentioning

confidence: 99%

Research on the fluctuation of the velocity and pressure of the flow field of an aerostatic bearing with a multi-hole integrated restrictor

Lü

Zhang

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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For an aerostatic bearing with a multi-hole integrated restrictor, which achieved superior precision lubrication-bearing performance, the fluctuations of the velocity and the pressure of the flow field were investigated. In this paper, the large-eddy simulation method was used to solve the three-dimensional Navier–Stokes equation in the calculation area of the gas film flow field at the orifice outlet of an aerostatic bearing, while the overrelaxation iteration method was used to solve the Reynolds equation in the remaining calculation areas. The influence factors of the flow field, such as the diameter of the orifice, the gas supply pressure and the gas film clearance, were derived and discussed. The results showed that the diameter of the orifice and the gas film clearance of aerostatic bearings with a multi-hole integrated restrictor strongly affected the film flow field near the outlet of the restrictor under a specified gas supply pressure. There was a critical ratio between the gas film clearance and the diameter of the orifice of aerostatic bearings with a multi-hole integrated restrictor, which may be an initial signal and an important parameter of the flow field transition from laminar flow to turbulent flow.

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Section: Introductionmentioning

confidence: 99%

Research on the fluctuation of the velocity and pressure of the flow field of an aerostatic bearing with a multi-hole integrated restrictor

Lü

Zhang

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Although nano-ceramic materials can be processed by the ultra-precision machining technology, the theoretical basis of research on ultra-precision machining of the hard and brittle material technology in China is relatively weak. It is still a long process from industrialization [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Removal mechanism of ultrasonic vibration and ELID composite plane grinding based on ultrasonic vibration of nano-ceramic workpiece

Shao¹,

Zhao²,

Bian³

2018

J. vibroeng.

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To realize the high efficiency mirror surface grinding of hard brittle materials (such as nano-ceramic material), this work firstly constructs an experimental platform for workpiece ultrasonic vibration and ELID combined plane grinding according to the processing mechanism of ultrasonic vibration assisted grinding and ELID grinding; then, based on the removal mechanism of hard brittle material, this work analyzes the kinematics of single abrasive grit with workpiece ultrasonic vibration plane grinding, and studies the effect of ELID plane grinding on the grinding depth; finally, based on the above work, this work proposes the mathematical model of material removal rate for the workpiece ultrasonic vibration and ELID combined plane grinding. Experimental results show that the material removal rate of combined plane grinding increases with the increase of the cutting depth and workpiece speed, the material removal rate of ultrasonic vibration and ELID combined grinding is higher than that of ELID grinding under the same conditions.

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“…It needs not only shape tools or fine abrasives, but also good dynamic performance and high-accuracy micro feed system more importantly [9,10], as the direct and hard contact between tool and work-piece in machine work, the vibration of machine tool is easy to reflect on the machined surface. To date, some researchers have studied the dynamic performance of ultra-precision cutting machine tool; Liang et al [11] presented a dynamic optimization of an ultraprecision diamond flycutting machine tool, successfully produced 415 × 415-mm surfaces on aluminum and crystalline optics, with 1.3-μm flatness and 2.4-nm rms roughness.…”

Section: Introductionmentioning

confidence: 99%

Research on surface topography in ultra-precision flycutting based on the dynamic performance of machine tool spindle

An²,

Wang

et al. 2016

Int J Adv Manuf Technol

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The dynamic performance of ultra-precision cutting machine tools is an important factor for its machining accuracy. To improve the precision of the machine tool, a surface topography model is built in this paper and the tool path during the cutting process is achieved by dynamic finite element analysis (DFEA) of the air spindle in ANSYS, surface topography is obtained using MATLAB simulation by combing the model with the tool path, and an experiment is carried out for validation. Results show the simulation surface is highly consistent with the experimental result. Dynamic performance of the spindle is the main factor for texture generation, and optimization of spindle is investigated, DFEA of the optimized spindle shows better performance, and the connection mode between diamond tool and cutter head should be further studied.

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Development Research of Science and Technologies in Ultra-precision Machining Field

Cited by 53 publications

References 0 publications

Research on the fluctuation of the velocity and pressure of the flow field of an aerostatic bearing with a multi-hole integrated restrictor

Research on the fluctuation of the velocity and pressure of the flow field of an aerostatic bearing with a multi-hole integrated restrictor

Removal mechanism of ultrasonic vibration and ELID composite plane grinding based on ultrasonic vibration of nano-ceramic workpiece

Research on surface topography in ultra-precision flycutting based on the dynamic performance of machine tool spindle

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