A new approach on the determination of ease of machining by EDM processes

Mahardika, Muslim; Tsujimoto, Takayuki; Mitsui, Kimiyuki

doi:10.1016/j.ijmachtools.2007.12.012

Cited by 62 publications

(31 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The electrode made of graphite had the highest surface roughness value while copper had the lowest value. This result appears to be supported by previous research by Mahardika (2007) [6], which suggested that there were at least three important factors affecting the EDM machining process, i.e. λ (thermal conductivity), θ (melting point), and ρ (electrical resistivity).…”

Section: Findings and Discussionsupporting

confidence: 88%

“…Conventional machines rely on the hardness of tools and workpieces, whereas EDM machines depend on λ (thermal conductivity) θ (melting point) and ρ (electrical resistivity) [6]. The machining time cannot be considered as a parameter for the ease of EDM process because there are many other relatively complex factors affecting it, such as adhesion, cavitation, and short-circuiting [6].…”

Section: A Determining Factors In the Ease Of Edm Processmentioning

confidence: 99%

See 1 more Smart Citation

Factors Affecting the Surface Roughness in Sinking EDM Process

Fikri

Romlie

Aminnudin

2017

JMEST

View full text Add to dashboard Cite

The purpose of this study is to gain insights into the surface quality (smoothness) of sinking EDM machining products. Among other non-conventional machining processes, Electrical Discharge Machining (EDM) is the most commonly used process. EDM is a machining process that uses electric sparks created between a workpiece and a tool (electrode). As a manufacturing process, EDM is used for workpieces which have intricate contours and precise dimensions, and works by using electric discharges (sparks) applied in a rapid series of repetitive electrical discharges between the two electrodes, separated by a dielectric fluid, and subject to an electric voltage. Since the tool tends to wear easily and the mould material is very hard and tough, it is necessary to keep within appropriate EDM machining parameters, so that the smoothness of the mould lives up to expectations. Therefore, the parameters of sinking EDM process should be well established to produce the expected results, i.e. the smoothest surface quality and the maximum removal rate. Regarding the electrode materials used, conducting a further experiment is required to achieve the appropriate settings of pulse current, on-time, off-time, servo voltage, and gap width. This experimental study involved several factors: (a) electrode material, (b) magnitude of current, (c) on-time, and (d) quality of surface (smoothness). In this study, the gap between the electrode and the workpiece was controlled at a distance of 40 μm, and with an off-time of 5 seconds, the same dielectric fluid, the same flow speed and the same dielectric immersion, and using the workpiece (AISI P20M steel). Quantitative approaches (t test, one-way, and ANOVA) were applied to analyse the results of comparison test and to determine the best parameter in sinking EDM process.

show abstract

Section: Findings and Discussionsupporting

confidence: 88%

Section: A Determining Factors In the Ease Of Edm Processmentioning

confidence: 99%

Factors Affecting the Surface Roughness in Sinking EDM Process

Fikri

Romlie

Aminnudin

2017

JMEST

View full text Add to dashboard Cite

show abstract

“…The debris in the gap increase short circuiting and arcing and improper flushing leads to an increase in TWR. In addition to the discharge energy, workpiece and electrode material, aspect ratio, electrical and thermal properties of the materials also plays an important role in TWR during micro-EDM process [18]. Although, it was observed that the TWR in brass electrode is higher than the tungsten electrode material.…”

Section: Effect Of Input Parameters On Twrmentioning

confidence: 99%

Investigation of Process Parameters in Micro -EDM Machining

Babu.T¹,

.Ravishankar²,

Koorapati³

2014

IJIRSET

View full text Add to dashboard Cite

ABSTRACT:Micro-EDM is a newly developed method to produce micro parts which in the range of 50-100µm.It is an efficient machining processes for the fabrication of a micro -metal hole with various advantages resulting from its characteristics of non-contact and thermal processes. In this paper the Taguchi design approach has been employed to investigate the micro -EDM parameters in order to achieve the highest Material Removal Rate (MRR), good surface quality and low Tool Wear Rate(TWR) while machining Ni-Ti based Shape Memory Alloy (SMA),it has been observed that MRR is highly influenced by capacitance , discharge voltage and depends up on the electrode material .Tungsten electrode is recommended for better surface roughness and brass electrode for better MRR.

show abstract

“…The composition and density of three kinds of workpiece materials are shown in Table 3. According to the ⋅ ⋅ theory [21], the thermal conductivity, melting point, and electrical resistivity are the main factors which influence the corrosion stability of electrode. The physical properties of electrode materials are shown in Table 4.…”

Section: Materials Composition and Measuring Instrumentmentioning

confidence: 99%

A New Measurement Method of Relative Volume Wear Ratio Based on Discharge Debris Composition Analysis in Micro-EDM

Liu

Jia

Zou

et al. 2014

Advances in Mechanical Engineering

View full text Add to dashboard Cite

In microelectrical discharge machining (micro-EDM) milling process, due to the unavoidability of electrode wear, selection of electrode with high electrical erosion resistance and accurate electrode compensation is entitled to be conducted to ensure high precision and high quality. The RVWR is used as criterion for electrode wear characteristics and is fundamental to achieve accurate electrode compensation; however, it is hardly measured accurately with conventional methods. In this paper, firstly, the error of RVWR measured by conventional measurement method is analyzed. Thereafter, for accurately measuring RVWR, a new measurement method is proposed based on electrical debris composition analysis. The RVWR of widely used tungsten, molybdenum, and copper electrode in machining different materials is measured, respectively, and the optimum electrode is selected based on the measuring results. Finally, microgrooves on different materials are machined with tungsten electrode, and the experiment results show that the microstructures have good bottom surface profiles, which indicates that the proposed method is effective to precisely measure the RVWR and guarantee accurate electrode compensation in micro-EDM process.

show abstract

A new approach on the determination of ease of machining by EDM processes

Cited by 62 publications

References 9 publications

Factors Affecting the Surface Roughness in Sinking EDM Process

Factors Affecting the Surface Roughness in Sinking EDM Process

Investigation of Process Parameters in Micro -EDM Machining

A New Measurement Method of Relative Volume Wear Ratio Based on Discharge Debris Composition Analysis in Micro-EDM

Contact Info

Product

Resources

About