A Review on Electrical Discharge Machining of Ceramic Based Composite Material

A new method was adopted in this study to machine C/SiC composite. The machinability was studied by processing some shapes in the material in this way. Small deep holes were machined firstly to test whether the copper electrode was suitable enough to be adopted in the Electrical Discharge Machining. Then holes of different diameters were processed by two kinds of electrodes to study the more appropriate electrode material by comparing machining efficiency of two electrodes. Then complicated shapes were machined based on these conditions. Finally, a simulation model was built up to study the influence of the fluid on the electrode and the workpiece in the Fluent 6.3. According to the study, Electrical Discharge Machining Technology is suitable enough to machine the hard and brittle materials like C/SiC composite and the accuracy that the error should not exceed 0.5 mm can also be guaranteed well.

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Investigation on Material Removal Rate and Surface Finish in Electrical Discharge Machining of AA 6061-B4C Composite Material

Journal of University of Shanghai for Science and Technology ◽

10.51201/jusst/21/121002 ◽

2021 ◽

Vol 23 (12) ◽

pp. 224-235

Author(s):

N. Ethiraj ◽

◽

T. Sivabalan ◽

Saibal Chatterjee ◽

Seeramsetti Mahesh ◽

...

Keyword(s):

Surface Roughness ◽

Composite Material ◽

Process Parameters ◽

Material Removal Rate ◽

Discharge Current ◽

Electrical Discharge ◽

Material Removal ◽

Electrical Discharge Machining ◽

Removal Rate ◽

Pulse On Time

One of the non-conventional techniques of metal removal manufacturing processes is electrical discharge machining (EDM). The objective of this paper is to prepare a composite material consisting of a matrix of Aluminium AA 6061 alloy and Boron carbide (B4C) as reinforcement and investigate the output responses, the material removal rate, the quality of the surface formed and overcut during EDM process. The process parameters discharge current, Pulse on time and Duty cycle along with the weight % of B4C are considered for investigation to investigate the output responses such as material removal rate, surface roughness and overcut. From the experimental results, it is observed that the weight % of reinforcement has more influence on the material removal rate. The parameters discharge current and pulse-on-time plays an important role in reducing the surface roughness and overcut. Microstructural study helps in understanding the effect of process parameters on the output responses.

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Long-length tubular Electrode-Tools from Composite Material for Electrical Discharge Machining of Hard Alloys

MATEC Web of Conferences ◽

10.1051/matecconf/202134401016 ◽

2021 ◽

Vol 344 ◽

pp. 01016

Author(s):

Evgeny Shalunov ◽

Valentin Smirnov ◽

Vladimir Plotnikov ◽

Yulia Vladimirova

Keyword(s):

Composite Material ◽

Hard Alloy ◽

Electrical Discharge ◽

Electrical Discharge Machining ◽

Copper Electrode ◽

Hard Alloys ◽

Powder Composition ◽

New Material ◽

Optimal Mode ◽

Tubular Electrode

The article deals with long-length tubular electrode-tools made of the engineered composite [(WC+3wt%Co)+3wt%BN)]+14wt%Cu, which, during electrical discharge piercing of holes in a hard alloy WC+6wt%Co (ISO 513:2012) in the optimal mode, have a productivity that is almost 8 times higher than the productivity of the process, when it is performed using copper electrode-tools. Therewith, electrical discharge wear of the electrode-tools made of the new material is 4.1 ... 4.5 times less than the wear of the copper electrode-tools. To obtain hollow electrodetools from the specified material, the powder composition was radially molded by the pressure of a impulsed magnet field, and the resulting porous blank was impregnated with copper during its further sintering.

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