scholarly journals Study of Surface Modification by Electrical Discharge Machining. (1st Report). Effect of Mixing Powder into Working Fluid for Working Surface.

2002 ◽  
Vol 36 (82) ◽  
pp. 25-32
Author(s):  
Masaaki SANO ◽  
Masahiko HIHARA ◽  
Koji YATSUSHIRO ◽  
Naotake MOHRI
Keyword(s):  
Surface Modification ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Working Fluid ◽  
Working Surface

Study on Die Surface Coating by Electric Discharging Machining

2012 ◽  
Vol 490-495 ◽  
pp. 2619-2623 ◽  
Author(s):  
Xiao Hai Li ◽  
De Cheng Wang ◽  
Yu Fang
Keyword(s):  
Surface Modification ◽  
Power Supply ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Coating Layer ◽  
Pulse Power ◽  
Working Fluid ◽  
Pulse Power Supply ◽  
Die Surface ◽  
New Type

A new method of die surface modification by ordinary Electrical Discharge Machining (EDM) is described. First, the surface modification mechanism by EDM is studied, which is different with ordinary EDM. Secondly, the influence of important electric parameters on the effect of electric discharging coating in working fluid is analyzed, which is helpful to improve the coating layer. At last, the new type special pulse power supply with additional pulse current is designed. The special pulse power supply for electrical discharge coating behaves well, and the compacted coating layer without cracks deposited on the surface of die by EDM can be obtained, which can prolong the life of die

A Truing Technique of Flattening Diamond Grains for Fabricating Microstructures with Fine Surfaces

2008 ◽  
Vol 389-390 ◽  
pp. 350-355
Author(s):  
Takeshi Harada ◽  
Takuya Semba
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge ◽  
Diamond Tool ◽  
Electrical Discharge Machining ◽  
Polycrystalline Diamond ◽  
Mesh Size ◽  
Diamond Disk ◽  
Working Surface ◽  
Work Material ◽  
Tool Profile

A truing technique that can be used to shape the tip of an electroformed diamond tool into a hemisphere and flatten diamond grains on the tool working surface at the same level as the bond face was developed. A polycrystalline diamond disk whose top surface roughened by electrical discharge machining was partially flattened by grinding was used as a truer. Diamond grains on the tool working surface were successfully flattened along the hemispherical tool profile when the grains mesh size of #1000 was employed. In addition, a grinding test using glasslike carbon as a work material revealed that a surface roughness of less than 50 nm Rz could be obtained in both cases when moving the tool on contour and scanning paths.

An extensive review on sustainable developments of dry and near-dry electrical discharge machining processes

2021 ◽  
pp. 1-37
Author(s):  
Sampath Boopathi
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Optimization Techniques ◽  
Machining Process ◽  
Working Fluid ◽  
Dielectric Fluid ◽  
Extensive Literature ◽  
Machining Processes ◽  
Research Activities ◽  
Dry Edm

Abstract Electrical discharge machining (EDM) is very essential unconventional electro-thermal machining process to machine the contour profile of hard materials in modern production industries. The liquid dielectric fluid has been replaced by the gas and minimum quantity of liquid mixed with gas (gas-mist) to encourage the green machining processes. The various gases and gas-mist have been used as the working fluid in dry and near-dry EDM respectively. The research-contextual, various dielectric fluids, sustainable and innovative developments, process parameters, machining characteristics, and optimization techniques applied in various dry and near-dry EDM have been illustrated through an extensive literature survey. Future research opportunities in both dry and near-dry EDM have been summarized to promote eco-friendly EDM research activities.

scholarly journals Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 1018
Author(s):  
Ziliang Zhu ◽  
Dengji Guo ◽  
Jiao Xu ◽  
Jianjun Lin ◽  
Jianguo Lei ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Shape Memory ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Recast Layer ◽  
Powder Concentration ◽  
Micro Electrical Discharge Machining ◽  
Machining Properties

Titanium-nickel shape memory alloy (SMA) has good biomedical application value as an implant. Alloy corrosion will promote the release of toxic nickel ions and cause allergies and poisoning of cells and tissues. With this background, surface modification of TiNi SMAs using TiC-powder-assisted micro-electrical discharge machining (EDM) was proposed. This aims to explore the effect of the electrical discharge machining (EDM) parameters and TiC powder concentration on the machining properties and surface characteristics of the TiNi SMA. It was found that the material removal rate (MRR), surface roughness, and thickness of the recast layer increased with an increase in the discharge energy. TiC powder’s addition had a positive effect on increasing the electro-discharge frequency and MRR, reducing the surface roughness, and the maximum MRR and the minimum surface roughness occurred at a mixed powder concentration of 5 g/L. Moreover, the recast layer had good adhesion and high hardness due to metallurgical bonding. XRD analysis found that the machined surface contains CuO2, TiO2, and TiC phases, contributing to an increase in the surface microhardness from 258.5 to 438.7 HV, which could be beneficial for wear resistance in biomedical orthodontic applications.

scholarly journals Surface Modification Process by Electrical Discharge Machining with TiC Semi-sintered Electrode.

2001 ◽  
Vol 67 (1) ◽  
pp. 114-119 ◽  
Author(s):  
Toshio MORO ◽  
Akihiro GOTO ◽  
Naotake MOHRI ◽  
Nagao SAITO ◽  
Koei MATSUKAWA ◽  
...  
Keyword(s):  
Surface Modification ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Modification Process ◽  
Sintered Electrode

Study the Re-Sticky Phenomenon of Powder Metallurgy Debris in the Electrical Discharge Machining

2009 ◽  
Vol 83-86 ◽  
pp. 968-976
Author(s):  
A Cheng Wang ◽  
Ken Chuan Cheng ◽  
Yan Cherng Lin ◽  
Jeng Shen Huang
Keyword(s):  
Powder Metallurgy ◽  
Melting Point ◽  
Rotational Speed ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Negative Polarity ◽  
Melting Points ◽  
Working Surface ◽  
Adhesive Effect

The debris re-adhering on the machining surface will affect the workpiece precision in EDM; therefore, the main purpose of this research is to study the re-sticky phenomenon of the powder metallurgy (PMM) in EDM. PMM with different melting points from 1450oC to 3410oC were used as EDM materials, the copper and the tungsten were chosen as the electrodes. The polarity in EDM was depended on the pole of the electrode. For observing the re-sticky position of the debris, the electrode was set no rotation or with 200 rpm rotational speed in EDM. The results showed that the melting point of PMM did not exceed 3000oC (PMM did not contain tungsten); the debris of PMM would not re-stick on the working surface no matter what polarity was used in EDM. However, only negative polarity can cause the re-adhesive effect when the melting point of PMM exceeded 3000oC. The debris would re-stick on any machining position when the electrode was not rotated in EDM. However, the debris would adhere on the central of the working area with 200 rpm rotational speed of the electrode.

Direct Measurement of Electrode Movement During Electrical Discharge Machining by Means of Automatic Discharge Gap Controller

2010 ◽  
Vol 4 (6) ◽  
pp. 552-561 ◽  
Author(s):  
Masahiko Kita ◽  
◽  
Tohru Ishida ◽  
Yoshimi Takeuchi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Power Supply ◽  
Research Group ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Working Fluid ◽  
Method Of Measurement ◽  
Discharge Gap

This study deals with the development of a new method of directly measuring the movement of an electrode during normal electrical discharge machining (EDM) and the movement of an electrode during EDM by means of an automatic discharge gap controller (ADGC) devised by our research group. The ADGC, which mainly consists of a bidirectional actuator using a shape memory alloy (SMA) and an electrode and power supply for EDM, can sustain stable EDMby autonomously and automatically controlling the position of the electrode to keep the discharge gap appropriate. However, the movement of the electrode being controlled by the ADGC cannot be directly measured due to itsminute, high-speed, vibration-like movements inside the working fluid during EDM. This means that there is no way to prove that the ADGC actually controls the position of the electrode so as to maintain a suitable discharge gap for continuing stable EDM. This also means that there is no way to evaluate the movement of the electrode quantitatively and to design or optimize the structure of an ADGC so as to give the ADGC the desired or best performance. Therefore, a method to directlymeasure the electrodemovement by an ADGC is devised in this study. The results obtained in the measurement experiments using this method of measurement prove that the ADGC actually moves its electrode to achieve stable EDM, and they allow the movement of the electrode to be evaluated quantitatively.

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