Fabrication of a micro-pin array with high density and high hardness by combining mechanical peck-drilling and reverse-EDM

Hwang, Yu-Lung; Kuo, Chung-Ming; Hwang, Shun‐Fa

doi:10.1016/j.jmatprotec.2010.02.022

Cited by 34 publications

(14 citation statements)

References 29 publications

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“…In another study by Zeng et al [10] observed the reduction in machining time with the increase in voltage and capacitance. Hwang et al [11] developed an efficient method to fabricate the micro pin array (40x40) having high hardness and high density by combining the vibration assisted mechanical peck drilling to drill micro-hole array and R-EDM to replicate these holes on workpiece. In order to achieve optimum results for R-EDM various flushing techniques for debris removal have been analysed.…”

Section: Reverse Edmmentioning

confidence: 99%

Macro Scale Arrayed Structure Fabrication using Reverse EDM

Nikam¹,

Mawal²,

Patil

et al. 2017

Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016)

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Abstract:In the last few years, industries have been facing challenges to fabricate the complex shaped geometries and arrayed structures on difficult to cut materials. Recently, various researchers have successfully applied reverse electro-discharge machining (R-EDM) process for manufacturing of the arrayed structures at micro-level. In this paper an attempt has been made to check the feasibility of R-EDM for manufacturing the arrayed structure at macro-level and used it as a tool electrode in normal EDM. Effects of process variables likepulse current, gap voltage and pulse ON time are analyzed through the variation of material removal rate (MRR), tool wear rate (TWR) and surface roughness. Discharge current found to be an influential parameter which affects the MRR and TWR severely in both variants of EDM i.e. R-EDM and normal EDM.

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Section: Reverse Edmmentioning

confidence: 99%

Macro Scale Arrayed Structure Fabrication using Reverse EDM

Nikam¹,

Mawal²,

Patil

et al. 2017

Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016)

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“…66 Micro-pin arrays with high-density and high-hardness were fabricated by combining mechanical peck-drilling and reverse-EDM. 67 This method provides a rapid and efficient process to form micro-pin arrays.…”

Section: Subtractive/subtractivementioning

confidence: 99%

Hybrid manufacturing in micro/nano scale: A Review

Chu

Kim

Lee

et al. 2014

Int. J. of Precis. Eng. and Manuf.-Green Tech.

156

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In this paper, a total of 57 micro and nano scale hybrid manufacturing processes are reviewed. These processes are categorized in terms of process timing and process type. Process timing is one of the most important aspects of manufacturing, and three different process schemes -concurrent, main/assistive (M/S) separate, and main/main (M/M) separate -are considered. The process type is categorized as either geometrically additive or subtractive, and all hybrid processes are categorized into combinations of additive, subtractive, and assistive process. Features and advantages are described for each of these classifications. Machining is found to be the most common process for both micro and nano-scale hybrid manufacturing. Of micro scale hybrid manufacturing schemes, 74.4% use assistive processes as a secondary process because the main purpose of most micro scale hybrid manufacturing is to improve the quality of the process. In nano scale manufacturing, 61.5% of hybrid manufacturing schemes employ assistive processes, since these processes typically focus on the fabrication of parts that are difficult to fabricate using a single, existing process. Based on a summary of published work, future trends in hybrid manufacturing at the micro and nano scale are suggested.

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“…7 Hwang et al fabricated array of 40 × 40 (1600 pins of Ø30 µm, length 625 µm and pitch 100 µm) on WC (Tungsten Carbide) over 6.8 × 6.8 mm 2 area using RMEDM. 8 Peng et al 9 generated intricate micro features of high aspect ratio by means of a combination of RMEDM (deposition) followed by MEDM (selective removal). Mujumdar et al 1 generated micro pillars of comparable length but dissimilar diameters using RMEDM process.…”

Section: Introductionmentioning

confidence: 99%

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

Roy

Balasubramaniam

2019

Journal of Micromanufacturing

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Non-conformal reverse micro electrical discharge machining (NC-RMEDM) is a variant of conventional RMEDM developed by the present authors wherein modification in the tool is carried out to generate different shapes of micro features. In this study, the effect of various factors like flat bottom and taper bottom hole, inversing the position of tool and workpiece and changing the hole depth have been experimentally investigated to determine the optimal combination required for generating hemispherical shaped micro features. It was found that hemispherical shaped micro feature can be generated by employing tapered bottom blind hole as tool. Buoyancy assisted machining (BAM) with traverse of workpiece (anode) downwards into the tool (cathode) and vice versa, i.e., buoyancy opposed machining (BOM) with traverse of tool downwards into the workpiece were carried out to study the generation of hemispherical micro feature based on inversion of electrode positions. Although both BAM and BOM generated hemispherical shaped feature, BAM is preferred due to reduced machining time as opposed to BOM. Also, increasing the hole depths led to altering the shape of micro feature from hemispherical to cylindrical with hemispherical end and coni-spherical end. An array of hemispherical micro features was fabricated based on the finding from this study, and surface roughness analysis was carried out which showed that irrespective of the position of micro feature on the array, surface roughness at the tip and base of the micro feature is lower as compared to side portion.

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Fabrication of a micro-pin array with high density and high hardness by combining mechanical peck-drilling and reverse-EDM

Cited by 34 publications

References 29 publications

Macro Scale Arrayed Structure Fabrication using Reverse EDM

Macro Scale Arrayed Structure Fabrication using Reverse EDM

Hybrid manufacturing in micro/nano scale: A Review

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

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