Characteristics of plasma channel in powder-mixed EDM based on monopulse discharge

Wang, Xiaolong; Y, Liu; Zhang, Yanzhen; Sun, Qiang; Li, Zhen; Shen, Yang

doi:10.1007/s00170-015-7236-6

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…Many researchers have considered the effects of other processing parameters. Wang et al 8 systematically investigated the breakdown process and impedance characteristics of plasma channels by single-pulse discharge experiments. They analyzed the effects of discharge current and discharge gap distance on the breakdown process and impedance characteristics of plasma channels.…”

Section: Introductionmentioning

confidence: 99%

Effects of non-electrical parameters on the characteristics of discharge craters and machining performance in short electrical arc milling

Wang

Zhou

Chen

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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During electrical discharge machining (EDM), the process parameters greatly influence the discharge characteristics and machining performance, including electrical and non-electrical parameters. As a new EDM method, short electrical arc milling (SEAM) is plagued by frequent short circuits, poor debris removal, and low energy-transfer efficiency. Therefore, this paper investigated the influence of non-electrical parameters (electrode material, working medium, and electrode rotation) on the crater characteristics, machining efficiency, and electrode wear. The micromorphological characteristics of the workpiece were explored. The results suggested that non-electrical parameters compressed and fractured the plasma channels, thus changing the effect of EDM. The air-tap water medium and electrode rotation promoted debris removal and arc breaking, which prevented the arc from ablating the workpiece. When GH4099 alloy was machined with a copper electrode, the workpiece surface quality and machining efficiency were high, and the thickness of the heat-affected zone was small. This work reveals the characteristics of short electric arc discharge and provided a theoretical basis for the efficient and high-quality machining of difficult-to-cut materials by SEAM.

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Section: Introductionmentioning

confidence: 99%

Effects of non-electrical parameters on the characteristics of discharge craters and machining performance in short electrical arc milling

Wang

Zhou

Chen

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The thermal phenomenon in powder-mixed near-dry electrical discharge machining (PMND-EDM) was explained, and the tendency of variation in MRR was analysed by varying each process parameter [7] to [9]. The plasma channel characteristics in PM-EDM were analysed [10]. It was proved that the plasma channel was much more stable in PM-EDM than the plasma formed in pure kerosene oil because the plasma generated in PM-EDM was compressed by the electric bridge of conductive powder particles in EDM oil.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Metallic Powder in Near-Dry Electric Discharge Machining

Sundriyal

Vipin

Walia

2020

SV-JME

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Near-dry electrical discharge machining (ND-EDM) is an eco-friendly process. In this study, an approach has been made to make the machining process more efficient than ND-EDM with the addition of metallic powder with the dielectric medium to machine EN-31 die steel. Powdermixed near-dry EDM (PMND-EDM) has several advantages over the ND-EDM or conventional electrical discharge machining (EDM) process, such as a higher material removal rate (MRR), fine surface finish (Ra), sharp cutting edge, lesser recast layer, and lower deposition of debris. The output response variables are MRR, Ra, residual stress (RS) and micro-hardness (MH) of the machined surfaces. Further study of the workpiece was performed, and a comparative study was conducted between ND-EDM and PMND-EDM. In this proposed method of machining, the MRR, Ra, and MH increased by 17.85 %, 16.36 %, and 62.69 % while RS was reduced by 56.09 %. Highlights • Experimental investigations have been conducted in the PMND-EDM process. The metallic powder (zinc) as an additive alongwith the mist of a dielectric medium was used for performance enhancements. • In PMND-EDM, the MRR was influenced by powder concentration. The MRR increases with the increase in metallic powder concentration, and the maximum increase in MRR was 17.85 %, as compared to ND-EDM. • The surface finish was improved by 16.36 % in PMND-EDM as the sparking is uniformly distributed among the powder particles, which gives even and uniform machined surfaces. • There was a decrease in residual stress by 56.09 % over the machined surfaces in PMND-EDM as compared to ND-EDM process. • The maximum increase in MH was 62.69 % over the machined surface in PMND-EDM as compared to ND-EDM.

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“…This allows better flushing of the gap and removing the debris. Wang et al [27] analyzed the breakdown process of a dielectric and the growth of plasma channels through single-pulse discharges. Their research indicates that the discharge channel is compressed by the bridge of conductive particles stabilizing the narrow plasma channel.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Reduced Graphene Oxide Flakes in the Dielectric on Electrical Discharge Machining

Świercz

Oniszczuk-Świercz

2019

Nanomaterials

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Electrical discharge machining (EDM) is a nonconventional technology that is frequently used in manufacturing for difficult-to-cut conductive materials. Drawbacks to using EDM include the resulting surface roughness and integrity. One of the recent innovations for improving surface integrity with EDM is the use of a powder mixed dielectric. The aim of this study is to analyze the influence of having reduced graphene oxide (RGO) in the dielectric on the ionization of the plasma channel and the dispersion of electrical discharges. The main goal is to improve the surface integrity of the tool steel 55NiCrMoV7 during finishing machining. To achieve this goal, an experimental investigation was carried out to establish the smallest possible values of discharge current and pulse time at which it is possible to initiate an electric discharge, which causes material removal. Next, the effect of the direction of the electric discharges (electrode polarity) and the concentration (percentage) of RGO in the dielectric on surface integrity was investigated. The results of this experiment indicate that during EDM with RGO, the discharges are dispersed on the RGO flakes. This leads to a multiplication of the discharges during a single pulse, and this strongly affects the surface integrity. The obtained results indicate that it is possible to reduce surface roughness and thickness of the recast layer by approximately 2.5 times compared with conventional EDM.

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Characteristics of plasma channel in powder-mixed EDM based on monopulse discharge

Cited by 16 publications

References 24 publications

Effects of non-electrical parameters on the characteristics of discharge craters and machining performance in short electrical arc milling

Effects of non-electrical parameters on the characteristics of discharge craters and machining performance in short electrical arc milling

Study on the Influence of Metallic Powder in Near-Dry Electric Discharge Machining

The Effects of Reduced Graphene Oxide Flakes in the Dielectric on Electrical Discharge Machining

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