Modelling of Electrochemical arc Machining by Use of Dynamic Data Systems

Khayry, A. B. M.; McGeough, J. A.

doi:10.1007/978-1-349-07529-4_37

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…The spectral moments / 0, / 2 and / 4 for the power records can be obtained from ( 13) and ( 28) and for the same bandwidths as the voltage spikes. Even when this analysis is carried through, only qualitative conclusions can be reached on the effects of power in ecam, such as severity of damage to the machined surface and stability of the process (Khayry & McGeough 1985).…”

Section: (C) Discrimination Between Erosion and Dissolution Phases In E C A Mmentioning

confidence: 99%

“…In ecam metal is removed from an anodic work-specimen (and also, to a lesser extent, from the cathodic tool) by a succession of discrete phases of electrochemical dissolution (ecd) and electrodischarge erosion (ede); the latter phase occurs usually in the form of arc, rather than, spark discharges. Previous studies of ecam by Khayry & McGeough (1985), Khayry (1984) and Crichton & McGeough (1985) have revealed that ignition and termination of sparks and/or arcs in ecam arise at random in the interelectrode gap between the cathode and anode electrodes. Electrolytic dissolution occurs between successive discharges, ecd therefore becoming a further random event in ecam.…”

Section: Introductionmentioning

confidence: 96%

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Analysis of electrochemical arc machining by stochastic and experimental methods

Khayry

McGeough

1987

Proc. R. Soc. Lond. A

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Metal removal by a novel process, electrochemical arc machining (ECAM), is described. The mechanisms underlying ECAM, electrochemical dissolution (ECD) and electrodischarge erosion (EDE) are investigated as events that occur at random in the machining gap, between the cathode tool and anode workpiece. These phases are registered as spikes of varying height and width in voltage and power recordings of the process; a stochastic method in the form of linear and nonlinear models is used to describe them. The basis of the ensuing analysis is the interpretation of model parameters in the light of physical behaviour known to arise in established electrochemical (ECM) and electrodischarge (EDM) machining. To that end, the spectral moments developed from the voltage recordings are used to discern between the phases of ECD and EDE arising in ECAM, and between the onset of sparks or arcs in the EDE-phase. The practical case of hole-drilling by ECAM is used to illustrate the main aspects of this stochastic approach: the effects of the principal machining process variables on the type, intensity and duration of the resulting ECD and EDE phases are assessed.

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Section: (C) Discrimination Between Erosion and Dissolution Phases In E C A Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Analysis of electrochemical arc machining by stochastic and experimental methods

Khayry

McGeough

1987

Proc. R. Soc. Lond. A

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“…The workpiece, which is in the vicinity of the tool electrode, is removed by the discharge erosion and chemical etching [1,2]. Since the complexity of ECDM involves the interdependence of thermal, electrochemical and mechanical effects, other terminologies are used in the literature, such as electrochemical spark machining (ECSM) [3], electrochemical arc machining (ECAM) [4] and spark-assisted chemical engraving (SACE) [5]. Karafuji and Suda [6] applied the ECDM to machine glass in 1968.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition grinding (EPDG) for improving the precision of microholes drilled via ECDM

Yan¹,

Yang²,

Huang³

et al. 2007

J. Micromech. Microeng.

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Electrochemical discharge machining (ECDM) is an alternative method to microdrill Pyrex glass for MEMS devices. However, the taper and the heat-affected zone of the microholes resulting from the thermal energy is a problem to which attention has to be paid. This study attempts to improve the ECDMed microhole quality by applying electrophoretic deposition grinding (EPDG). ECDM was first used to drill a microhole and was followed by EPDG to refine the hole. The experimental results demonstrated that selecting a suitable diameter of the tool in EPDG is important to improve the taper angle of microholes machined by ECDM. A step shape tool with ϕ210 µm diameter was designed as a critical factor for improving the taper. An excellent taper angle of 0.2° could be achieved. At the beginning of EPDG, the taper angle and wavy surface of the ECDMed hole were improved by the step shape tool. The subsequent EPDG further improved the surface roughness. Additionally, a sufficient grinding time was required to produce a fine surface. Improving surface roughness requires a higher tool rotation speed and a longer grinding time. However, the dislodging of abrasives in the entrance will worsen the roundness and increase the diameter difference of the hole. Suitable grinding parameters for use in the experiments include tool rotation speed: 1500 rpm, abrasive size: 0.3 µm and grinding time: 500 s. After EPDG, the surface roughness of the microholes achieved was 5 nm Ra. This study demonstrates the feasibility of using EPDG to improve the quality of the ECDMed hole.

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Modelling of Electrochemical arc Machining by Use of Dynamic Data Systems

Cited by 2 publications

References 5 publications

Analysis of electrochemical arc machining by stochastic and experimental methods

Analysis of electrochemical arc machining by stochastic and experimental methods

Electrophoretic deposition grinding (EPDG) for improving the precision of microholes drilled via ECDM

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