scholarly journals Role of Heat Transfer on Process Characteristics During Electrical Discharge Machining

10.5772/21090 ◽  
2011 ◽  
Author(s):  
Ahsan Ali
Keyword(s):  
Heat Transfer ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Process Characteristics

Ti-6Al-4V Surfaces in SiC Powder Mixed Electrical Discharge Machining

2013 ◽  
Vol 856 ◽  
pp. 226-230 ◽  
Author(s):  
Hamidullah Yaşar ◽  
Bülent Ekmekci
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Dielectric Liquid ◽  
Operational Parameters ◽  
Electrical Parameters ◽  
Machined Surface ◽  
Optical Scanning ◽  
Surface Topographies ◽  
Powder Suspension

The role of suspended particles on Ti-6Al-4V surface in Powder Mixed Electrical Discharge Machining (PMEDM) is studied using SiC powder mixing in water dielectric liquid. Surface modifications due to the additives in dielectric liquid are investigated by means of optical, scanning electron microscopy and energy dispersive spectroscopy. The attachment of added powders and surface topographies interrelated with powder suspension concentration, particle size and electrical parameters such as pulse on duration and current. The influence on discharge transitivity with respect to SiC additives is noticed with pock like features on the surface. The geometry and size of these features indicated a robust dependency with respect to operational parameters and indicated the role of secondary discharges during PMEDM. SiC particles severely transferred from di-electric liquid to machined surface at critical operational parameters and implied that the process could be also used as a surface alloying technique.

scholarly journals WEDM of Copper for the Fabrication of Large Surface-Area Micro-Channels: A Prerequisite for the High Heat-Transfer Rate

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 173 ◽  
Author(s):  
Naveed Ahmed ◽  
Mohammad Pervez Mughal ◽  
Waqar Shoaib ◽  
Syed Farhan Raza ◽  
Abdulrhman M. Alahmari
Keyword(s):  
Heat Transfer ◽  
Surface Area ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
High Heat ◽  
Critical Feature ◽  
Maximum Heat ◽  
High Heat Transfer ◽  
Maximum Heat Transfer ◽  
Micro Channels

To get the maximum heat transfer in real applications, the surface area of the micro-features (micro-channels) needs to be large as possible. It can be achieved by producing a maximum number of micro-channels per unit area. Since each successive pair of the micro-channels contain an inter-channels fin, therefore the inter-channels fin thickness (IFT) plays a pivotal role in determining the number of micro-channels to be produced in the given area. During machining, the fabrication of deep micro-channels is a challenge. Wire-cut electrical discharge machining (EDM) could be a viable alternative to fabricate deep micro-channels with thin inter-channels fins (higher aspect ratio) resulting in larger surface area. In this research, minimum IFT and the corresponding machining conditions have been sought for producing micro-channels in copper. The other attributes associated with the micro-channels have also been deeply investigated including the inter-channels fin height (IFH), inter-channels fin radius (IFR) and the micro-channels width (MCW). The results reveal that the inter-channels fin is the most critical feature to control during the wire electrical discharge machining (WEDM) of copper. Four types of fin shapes have been experienced, including the fins: broken at the top end, deflected at the top end, curled bend at the top, and straight with no/negligible deflection.

scholarly journals Исследование процессов электроэрозионной обработки

2019 ◽  
Vol 89 (6) ◽  
pp. 887
Author(s):  
М.Ю. Сарилов ◽  
В.В. Мыльников
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloys ◽  
Confidence Level ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Plasma Channel ◽  
Reference Value ◽  
Dielectric Medium ◽  
Liquid Dielectric ◽  
Fisher Criterion

AbstractBreakdown in liquid dielectric medium, plasma channel, and heat transfer in the course of electrical discharge machining are studied. Specific features and most important parameters of electrical discharge machining of titanium and aluminum alloys are determined. Theoretical, experimental, and simulated results indicate that the adequacy hypothesis can be accepted at a confidence level of 95%, since the Fisher criterion is no greater than the reference value.

scholarly journals Electrical Discharge Machining of Al (6351)-5% SiC-10% B4C Hybrid Composite: A Grey Relational Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. Suresh Kumar ◽  
M. Uthayakumar ◽  
S. Thirumalai Kumaran ◽  
P. Parameswaran ◽  
E. Mohandas
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Stir Casting ◽  
Electrode Wear ◽  
Relational Approach ◽  
Process Characteristics ◽  
Multiresponse Optimization ◽  
Grey Relational ◽  
Machining Parameter ◽  
Machining Characteristics

The goal of the present experimental work is to optimize the electrical discharge machining (EDM) parameters of aluminum alloy (Al 6351) matrix reinforced with 5 wt.% silicon carbide (SiC) and 10 wt.% boron carbide (B4C) particles fabricated through the stir casting route. Multiresponse optimization was carried out through grey relational analysis (GRA) with an objective to minimize the machining characteristics, namely electrode wear ratio (EWR), surface roughness (SR) and power consumption (PC). The optimal combination of input parameters is identified, which shows the significant enhancement in process characteristics. Contributions of each machining parameter to the responses are calculated using analysis of variance (ANOVA). The result shows that the pulse current contributes more (83.94%) to affecting the combined output responses.

Electrical discharge machining of Al (6351) alloy: role of electrode shape

2016 ◽  
Vol 53 (1) ◽  
pp. 86 ◽  
Author(s):  
S. Suresh Kumar ◽  
M. Uthayakumar ◽  
S. Thirumalai Kumaran ◽  
P. Parameswaran ◽  
E. Mohandas
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Electrode Shape
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