On the determination of current efficiency in electrochemical machining with a variable gap

Béjar, M.A.; Gutiérrez, Fernanda

doi:10.1016/0924-0136(93)90128-s

Cited by 49 publications

(26 citation statements)

References 7 publications

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“…Bejar and Gutierrez [11] changed the machining gap width as well as the concentration of electrolyte to investigate the influence upon current efficiency. They found that current efficiency is raised with the increase of current density and electrolytic concentration [11]. Overcut increases with voltage as a result of the increase of the current passed between anode and cathode [12].…”

Section: Introductionmentioning

confidence: 99%

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Electropolishing of cylindrical workpiece of tool materials using disc-form electrodes

Hocheng

2003

Journal of Materials Processing Technology

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This research presents a new application of electropolishing using a low-cost disc-form electrode offering fast improvement of the surface roughness of SKD61. It requires no expensive special-purpose equipment or heavy material removal as conventional electrochemical machining does, and it also avoids the complex pre-polishing of the workpiece before the electropolishing. Round bars or round tubes produced by traditional turning, drawing, form rolling, or extrusion, can be successively electropolished using the designed disc-form electrodes. Five electrode designs are discussed. The experimental parameters include rotational speed of workpiece, electrical current rating and pulse period, electrode geometry, and electrode feed rate. Thinner disc and larger disc taper angle are associated with larger discharge space for the electrode, thus the polishing is more effective. A smaller end radius of the disc electrode produces higher current density and provides faster feed rate and a better polishing effect. A disc with discharge flute performs better, and larger flute back rake angle, side rake angle, wider flute, and deeper flute depth are also advantageous. Although the use of pulsed current slightly outperforms the fluted electrode using continuous current, it sacrifices both machining time and cost. The best electrode design is identified. A guideline for the design of electrodes is provided based on the experimental results.

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Section: Introductionmentioning

confidence: 99%

“…An on-line monitoring system was proposed by Rajurkar [10]. Bejar and Gutierrez [11] changed the machining gap width as well as the concentration of electrolyte to investigate the influence upon current efficiency. They found that current efficiency is raised with the increase of current density and electrolytic concentration [11].…”

Section: Introductionmentioning

confidence: 99%

Electropolishing of cylindrical workpiece of tool materials using disc-form electrodes

Hocheng

2003

Journal of Materials Processing Technology

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“…Bejar et al changed the machining gap width as well as the concentration of electrolyte to investigate the influence upon current efficiency. They found that current efficiency is raised with the increase of current density and electrolytic concentration [38]. Bannard proposed the theory that correlates the current efficiency with current density and flow rate of electrolyte.…”

Section: The Removal Rate Of Depthmentioning

confidence: 98%

Electrochemical Machining

Pa¹,

Hocheng²

2012

Advanced Analysis of Nontraditional Machining

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Electrochemical machining has attracted increasing attention for micro-machining applications. The first section discusses a process to erode a hole of hundreds of microns diameter in a metal surface using a moving electrode. The discussion provides a method to predict the enlargement of the produced hole and to taper under the applied machining conditions. A computational model illustrates how the machined profile develops over time and as the electrode gap changes. The analysis is based on Faraday's laws of electrolysis and the mathematical integral describing a tool. The effectiveness of the model is tested by experiments that apply several electrode movement schemes.This chapter discusses the surface roughness of several common die materials produced by traditional machining, whereby the internal and external cylindrical surface are electropolished by different electrode designs. Electropolishing efficiency of die materials and parts should be high to improve surface roughness in the shortest amount of time possible, thereby reducing surface residual stresses. The study aims to identify an optimal electrode design, which will help broaden electromachining applications in the future. For electropolishing of internal holes, completely inserted feeding electrodes are supplied with both continuous and pulsed direct current. In the external electropolishing studies, we consider the design of the turning tool electrode, arrowhead electrode, ring-form electrode, and disc-form electrode. For internal electropolishing, an electrode featuring a helix discharge flute performs better than that without a flute or with a straight flute. The borer type electrode performs better an electrode with a lip on the leading edge. Pulsed direct current can improve the polishing, but the machining time and

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“…The electrochemical honing of cylindrical holes improves the dimensional accuracy and relieves the surface layer stress (Budzynski and Landolt, 1986). Bejar et al (1993) changed the machining gap width as well as the concentration of electrolyte to investigate the influence upon current efficiency. They found that current efficiency is raised with the increase of current density and electrolytic concentration.…”

Section: Introductionmentioning

confidence: 99%

Effective form design of electrode in electrochemical smoothing of end turning surface finishing

2008

Journal of Materials Processing Technology

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On the determination of current efficiency in electrochemical machining with a variable gap

Cited by 49 publications

References 7 publications

Electropolishing of cylindrical workpiece of tool materials using disc-form electrodes

Electropolishing of cylindrical workpiece of tool materials using disc-form electrodes

Electrochemical Machining

Effective form design of electrode in electrochemical smoothing of end turning surface finishing

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