scholarly journals New EDM Generator Used for the Machining of 1.2363 and 1.2343ESR Steels

2021 ◽  
Author(s):  
Katerina Mouralova ◽  
Josef Bednar ◽  
Libor Benes ◽  
Ales Polzer ◽  
Radim Zahradnicek ◽  
...  
Keyword(s):  
Current Pulse ◽  
Electric Discharge ◽  
Erosion Rate ◽  
Surface Defects ◽  
Pulse Current ◽  
Electricity Consumption ◽  
Electric Discharge Machine ◽  
Discharge Machine ◽  
Pulse On Time ◽  
Pulse Off Time

Abstract The basic building block of any electric discharge machine is a generator, which ensures the operation of material separation itself. Not only the erosion rate and electricity consumption but also the quality of the machined surfaces depend on the design of the generator. These key factors for efficient machining have been investigated using a new energy-saving and powerful generator developed for the electric discharge machine (EDM) while machining 1.2363 and 1.2343ESR steels. In order to monitor and model the responses in the form of eroding rate and surface quality, a two-level half-factor experiment was performed with one replication at the corner points and two replications at the central points, for a total of 80 rounds. Both graphite and copper electrodes of sizes 10x10 mm and 100x100 mm were used for eroding and the influence of parameter settings: Open-voltage, Pulse current, Pulse on-time and Pulse off-time was monitored. It was found out that the shape of the electrode and Pulse current have the most significant effect on the erosion rate. The parameters Pulse current, Pulse on-time and their mutual interaction have the most significant effect on the surface topography. Statistically significant factors influencing the occurrence of defects turned out to be Pulse current, Pulse on-time and Material of workpiece, where it can be seen that the material 1.2343ESR is significantly less prone to the formation of surface defects.

scholarly journals Effect of Input Parameters on SR and MRR for Tool Steel AISI L2 By Electric Discharge Machine (EDM)

2021 ◽  
Vol 39 (6) ◽  
pp. 928-935
Author(s):  
Shukry H. Aghdeab ◽  
Raed R. Shwaish ◽  
Tahseen M. Salman
Keyword(s):  
Surface Roughness ◽  
Electric Discharge ◽  
Material Removal ◽  
Removal Rate ◽  
Electric Discharge Machine ◽  
Steel Aisi ◽  
Discharge Machine ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Off Time

Electric discharge machine (EDM) or may be call electric spark machine is one of the most important cutting process or manufacturing process because it gives high accurate dimension and can be produced the most complex shape. In this present material removal rate and surface roughness for tool steel AISI L2 studied. The input parametric for this process is current, pulse on time (Ton) and pulse off time (Toff).A full factorial method is used to formulate machine parameters and find the optimal process parameters of an electric spark. The result shows that the Surface roughness increasing with increasing current and pulse on time is increases while no effect by increase in pulse off time. Best surface roughness when using low current and pulse in time. The material removal rate is increasing with increasing in current and pulse on time while decreasing when pulse of time is increased. The experimented and predicted values by using Minilab17 software ​​of this process are approximately equal.

scholarly journals An experimental study of surface roughness in electrical discharge machining of AISI 304 stainless steel

2018 ◽  
Vol 38 (2) ◽  
pp. 90-96 ◽  
Author(s):  
IGNACIO HERNÁNDEZ CASTILLO ◽  
ORQUÍDEA SÁNCHEZ LÓPEZ ◽  
GUILLERMO ARTURO LANCHO ROMERO ◽  
CUAUHTÉMOC HÉCTOR CASTAÑEDA ROLDÁN
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Current Pulse ◽  
Pulse Current ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Off Time

The effect of the pulse current, pulse on time and pulse off time on the surface roughness of AISI 304 stainless steel workpieces produced by electric discharge machining (EDM) using grade GSP-70 graphite electrodes was studied. A factorial design was performed, considering two levels for each of the three established parameters. From the statistical analysis, it was obtained that the pulse current and pulse on time are the most significant machining parameters on the obtained surface roughness values of the stainless steel AISI 304 workpieces machined by EDM. On the other hand, the regression analysis of a second order model was done to estimate the average roughness (Ra) in terms of the pulse current, pulse on time and pulse off time. Finally, the mean absolute percentage error (MAPE) of the roughness values estimated by the second order regression model and the roughness obtained experimentally is also presented.

Mathematical Modeling of Machining Parameters in Electrical Discharge Machining with Cu-B4C Composite Electrode

2012 ◽  
Vol 488-489 ◽  
pp. 871-875
Author(s):  
V. Anandakrishnan ◽  
V. Senthilkumar
Keyword(s):  
Mathematical Models ◽  
Current Pulse ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Machining Parameters ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Off Time ◽  
Selection Of

Copper based metal matrix composite reinforced with Boron Carbide is a newly developed Electrical Discharge Machining (EDM) electrode showing better performance than the conventional copper based electrode. Right selection of machining parameters such as current, pulse on time and pulse off time is one of the most important aspects in EDM. In this paper an attempt has been made to develop mathematical models for relating the Material Removal Rate (MRR), Tool Removal Rate (TRR) and Surface roughness (Ra) to machining parameters (current, pulse-on time and pulse-off time). Furthermore, a study was carried out to analyze thSubscript texte effects of machining parameters on various performance parameters such as, MRR, TRR and Ra. The results of Analysis of Variance (ANOVA) indicate that the proposed mathematical models, can adequately describe the performance within the limits of the factors being studied. Response surface modeling is used to develop surface and contour graphs to analyze the effects of EDM input parameters on outer parameters.

Nano Graphite Powder Assisted Electric Discharge Machining Characteristics of ZM21 Magnesium Alloy

2015 ◽  
Vol 787 ◽  
pp. 406-410
Author(s):  
S. Santosh ◽  
S. Javed Syed Ibrahim ◽  
P. Saravanamuthukumar ◽  
K. Rajkumar ◽  
K.L. Hari Krishna
Keyword(s):  
Magnesium Alloy ◽  
Material Removal Rate ◽  
Electric Discharge ◽  
Material Removal ◽  
Removal Rate ◽  
Machining Parameters ◽  
Electric Discharge Machining ◽  
Zm21 Magnesium Alloy ◽  
Pulse On Time ◽  
Pulse Off Time

Magnesium alloys are used in many applications, particularly in orthopaedic implants are very difficult to machine by conventional processes because of their complex 3D structure and limited slip system at room temperature. Hence there is an inherent need for alternative processes for machining such intricate profiles. Electric Discharge Machining is growing rapidly in tool rooms, die shops and even in general shop floors of modern industries to facilitate complex machining for difficult-to-machine materials and provide better surface integrity. Therefore, the use of electric discharge machining on ZM21 magnesium alloy is attempted in this paper. Nanographite powder is added for machining zone to enhance the electrical conductivity of EDM oil by way it improves the machining performance. Machining parameters such as the current, pulse on time and pulse off time were process parameters to explore their effects on the material removal rate and tool wear rate. It is observed that, an increased material removal rate was due to the enhanced electrical and thermal conductivity of the EDM oil.

scholarly journals Accuracy and finish during wire electric discharge machining of metal matrix composites for different reinforcement size and machining conditions

2016 ◽  
Vol 232 (6) ◽  
pp. 1068-1078 ◽  
Author(s):  
Alokesh Pramanik ◽  
Mohammad Nazrul Islam ◽  
Brian Boswell ◽  
Animesh K Basak ◽  
Yu Dong ◽  
...  
Keyword(s):  
Metal Matrix Composites ◽  
Electric Discharge ◽  
Metal Matrix ◽  
Surface Defects ◽  
Maximum Diameter ◽  
Medium Size ◽  
Matrix Composites ◽  
Electric Discharge Machining ◽  
Wire Tension ◽  
Pulse On Time

Electric discharge machining has been established as an effective alternative process to conventional material removal processes for machining reinforced metal matrix composites. Wire cut electric discharge machining holes were produced in a metal matrix composite (10 vol% of SiC in Al6061), which were then investigated to determine the machinability of the material using this process. It was observed that the input factors such as the size of reinforced particles, wire tension and pulse-on time significantly affect diameter error, circularity and surface roughness. Pulse-on time, the interaction between pulse-on time and wire tension contribute to the maximum diameter error. The wire tension is the most significant factor to circularity, which is followed by the interaction between pulse-on time. In particular, wire tension with low and high tensions results in poor circularity. It has been found that there are more surface defects encountered when particle sizes are smaller, and circularity is improved when particles are in a medium size. In addition, the surface defect is reduced as the particles increase the melting resistance of the surface. The higher pulse-on time leads to higher heat and more time to degrade the surface. Therefore, low pulse-on time and wire tension gave better surface finish.

Processing Stability Analysis of Wire Cut Electric Discharge Machine with High Speed

2013 ◽  
Vol 443 ◽  
pp. 74-78
Author(s):  
Jing Wang ◽  
Ming Gui Zhou
Keyword(s):  
Electric Discharge ◽  
High Speed ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Cutting Fluid ◽  
Processing Efficiency ◽  
Electric Discharge Machine ◽  
Wire Cutting ◽  
Discharge Machine ◽  
Processing Stability

In this article, unstable factor analysis is done in Wire cut electric discharge machine with high speed (WEDM HS), which focus on effect of processing Stability from electrical processing parameters, machine parameters, electrode wire, cutting fluid and conductive block, and how to adjust and excluding factors in order to enhance WEDM processing stability ,ensure machine parts surface quality, dimensional accuracy and processing efficiency.

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