Erosion Mechanism of Ultrasonic Vibration Abrasive Waterjet in Micro Machining

Zhu, Hong Tao; Huang, Chuan Zhen; Wang, Jun; Liu, Zeng Wen; Zhang, Shu Guang

doi:10.4028/www.scientific.net/kem.443.675

Cited by 4 publications

(5 citation statements)

References 17 publications

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“…There have been numerous reported works where ultrasonic vibration assistance is employed to improve the machining process. Vibration has also been used to assist microjet machining process [50,51] although the mechanisms beyond which the vibration affects the machining process and performance may be different from those in traditional machining where solid tools are used [52,53]. In a recent study at the authors' laboratory, ultrasonic vibration of 20 kHz was applied perpendicularly on the target material surface with the amplitude in an order of ten micrometres.…”

Section: Vibration Assisted Microjet Machiningmentioning

confidence: 99%

A review on the erosion mechanisms in abrasive waterjet micromachining of brittle materials

Nguyen

Wang

2019

Int. J. Extrem. Manuf.

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The fabrication of miniature structures on components with high-integrity surface quality represents one of the cutting edge technologies in the 21st century. The materials used to construct such small structures are often difficult-to-machine. Many other readily available technologies either cannot realise necessary precision or are costly. Abrasive waterjet (AWJ) is a favourable technology for the machining of difficult-to-machine materials. However, this technology is generally aimed at large stock removal. A reduction in the scale of this technology is an attractive avenue for meeting the pressing need of industry in the production of damage-free micro features. This paper reviews some of the work that has been undertaken at UNSW Sydney about the development of such an AWJ technology, focusing on the system design currently employed to generate a micro abrasive jet, the erosion mechanisms associated with processing some typical brittle materials of both single-and two-phased. Processing models based on the findings are also presented. The review concludes on the viability of the technology and the prevailing trend in its development.

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Section: Vibration Assisted Microjet Machiningmentioning

confidence: 99%

A review on the erosion mechanisms in abrasive waterjet micromachining of brittle materials

Nguyen

Wang

2019

Int. J. Extrem. Manuf.

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“…Under the effect of ultrasonic vibration, the polymer chains in the melt are forced to vibrate. The equation of melt vibration in the unit volume at the distance l to the ultrasonic vibration source can be expressed as :

x ((), t) = A_{0} e^{- ξ_{0} l} \cos ((), italicωt + ϕ), a ((), t) = ω^{2} A_{0} e^{- ξ_{0} l} \cos ((), italicωt + ϕ + π)

where A 0 e ‐ξ0l is the amplitude of ultrasonic vibration at the surface. The restoring force of the forced vibration unit under the effect of ultrasonic vibration can be obtained as:

F = m_{0} a = m_{0} \frac{{italicdx}^{2}}{{italicdt}^{2}} = - m_{0} ω^{2} x

where x is the vibration displacement, m 0 is the melt mass per unit volume, the negative sign describes that the direction of restoring force points toward the origin.…”

Section: Theoretical Modelsmentioning

confidence: 99%

Section: Entanglement-disentanglement Wall Slip Under Ultrasonic Vibrmentioning

confidence: 99%

Wall Slip of Linear Polymer Melts During Ultrasonic‐assisted Micro‐injection Molding

Gao

Qiu

Ouyang

et al. 2018

Polymer Engineering & Sci

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The wall slip of linear polymer melts under ultrasonic vibration is investigated by correcting the slip mechanism, and melt flow behaviors in ultrasonic‐assisted micro‐injection molding (UμIM) method are discussed. Based on the effect mechanism of ultrasonic vibration on the melt, theoretical models of the critical shear stresses for the onset of weak and strong wall slip during UμIM are established, and the change in rheological properties due to the onset of wall slip under ultrasonic vibration is experimental investigated by a built measurement system. The results show that the onset of weak and strong wall slip of the melt in micro cavity are promoted by ultrasonic vibration, which agree with the built theoretical models, and the melt filling capability in micro cavity is enhanced by reducing apparent viscosity and releasing shear stress of the polymer melt, which improves the molding quality of micro polymer parts via UμIM method. POLYM. ENG. SCI., 59:E7–E13, 2019. © 2018 Society of Plastics Engineers

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“…As for Figure .2, L refers to perimeter of sluiceway (raceway) in formula (1), S refers to arc length between central lines of coarse and superfinishing oilstones and sluiceway contact point in formula (2), swinging times x of oilstone is in formula (3). Assumed that rotary speed of working piece is n, axial swinging frequency of oilstone is f and radius of sluiceway (raceway) is r. Respectively choose single mill grain on coarse and superfinishing oilstone, the movement track on processing surface can be referred to Diagram 2, in which the full line and dotted line are respectively the tracks of coarse grain and superfinishing grain.…”

Section: Combined Superfinishing Of Precision Bearing Racewaymentioning

confidence: 99%

“…Recently, studies on combined processing technique are common applied to other fields, for example, Micro-Machining Technology of ECM Combined Ultrasonic Vibration, Jet Electrochemical Machining and Laser Beam Machining, Magnetorheological Fininshing Technology. For hard nonmetal raw materials, micro-machining technology of ECM combined ultrasonic vibration is feasible advantageous; however, such technology is featured with low efficiency and great tool wearing [1][2]for flexible metal materials. Jet Electrochemical Machining and Laser Beam Machining is defective as it requires secondary casting, thus it is much more applicable to coarse machining including perforating [3]; Magnetorheological Fininshing Technology is advanced technically, however, the time-consuming process will result in cost increment [4].…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanism of Combined Raceway Superfinishing Technique of Precision Bearing

Huang

Mei

et al. 2014

AMR

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This paper analyzes the mechanism of combined raceway superfinishing technique of precision bearing, via the relationship between coarse and superfinishing oilstone and raceway geometric accuracy, probes forming mechanism of raceway geometric accuracy under double oilstone pressure as well as auto dynamic control functions. Additionally, this paper analyzes the feasibility of combined coarse and superfinishing technique, brings forward practice methods and steps of combined finishing technique; discusses how to realize smooth transition of technique parameters, so as to reduce surface texture changes of working pieces, achieve assistant grinding of superfinishing oilstone, improve surface quality of raceway and decrease reflection error of superfinishing. Meanwhile, this paper adopts embeded technology to realize auto dynamic control of oilstone pressure, so as to effectively eliminate surface error resulted from oilstone raising and furthermore enhance surface geometric accuracy of precision bearing.

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Erosion Mechanism of Ultrasonic Vibration Abrasive Waterjet in Micro Machining

Cited by 4 publications

References 17 publications

A review on the erosion mechanisms in abrasive waterjet micromachining of brittle materials

A review on the erosion mechanisms in abrasive waterjet micromachining of brittle materials

Wall Slip of Linear Polymer Melts During Ultrasonic‐assisted Micro‐injection Molding

Research on the Mechanism of Combined Raceway Superfinishing Technique of Precision Bearing

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