scholarly journals Influence of Gap Phenomenon on Various Kinds of Powder-Suspended EDM

2013 ◽  
Vol 7 (4) ◽  
pp. 419-425
Author(s):  
Hideki Takezawa ◽  
◽  
Tadashi Asano ◽  
Naotake Mohri ◽  
◽  
...  
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
High Speed Camera ◽  
Machined Surface ◽  
Machined Surface Roughness ◽  
Observation Results

Powder-suspended Electrical Discharge Machining (EDM) produces a mirror-like finish due to the electrical discharge dispersed using powder-suspended fluid. Machined surface roughness differed, however, when several powders are mixed, so the influence of the gap phenomenon was not apparent. To vary the gap phenomenon in powder-suspended EDM, the gap region is observed using a high-speed camera. This report describes observation results in powdersuspended EDM.

Gas-Liquid Combined Multiple Cut in High-Speed WEDM

2010 ◽  
Vol 97-101 ◽  
pp. 4168-4171
Author(s):  
Tong Wang ◽  
Yu Mei Lu ◽  
Xian Chong Lu ◽  
Sun Fei Wang ◽  
Jing Zhe
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Wire Electrode ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
New Process ◽  
Dry And Wet Conditions ◽  
Discharge Gap

This paper investigates a new process of wire electrical discharge machining (WEDM) as gas-liquid combined multiple cut. High-speed WEDM (HS-WEDM) finishing was compared in atmosphere and emulsion. Dry finishing has shorter discharge gap, better straightness and surface roughness and much higher material MRR than that in emulsion. Influences of wire winding speed and no load worktable feed on machined surface quality in dry and wet conditions were discussed. The better straightness obtained in gas is explained by analyzing forces acting on wire electrode. When first cut and second cut were performed both in emulsion liquid, and third cut was done in atmosphere, the surface roughness is improved compared with conventional WEDM.

scholarly journals Surface Roughness Analysis of H13 Steel during Electrical Discharge Machining Process Using Cu–TiC Sintered Electrode

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5943
Author(s):  
Arminder Singh Walia ◽  
Vineet Srivastava ◽  
Mayank Garg ◽  
Nalin Somani ◽  
Nitin Kumar Gupta ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Electrical Discharge ◽  
Pulse Current ◽  
Electrical Discharge Machining ◽  
Machining Process ◽  
H13 Steel ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Semi Empirical

In electrical discharge machining (EDM), the machined surface quality can be affected by the excessive temperature generation during the machining process. To achieve a longer life of the finished part, the machined surface quality plays a key role in maintaining its overall integrity. Surface roughness is an important quality evaluation of a material’s surface that has considerable influence on mechanical performance of the material. Herein, a sintered cermet tooltip with 75% copper and 25% titanium carbide was used as tool electrode for processing H13 steel. The experiments have been performed to investigate the effects of EDM parameters on the machined surface roughness. The findings show that, as the pulse current, pulse length, and pulse interval are increased, the surface roughness tends to rise. The most significant determinant for surface roughness was found to be pulse current. A semi-empirical surface roughness model was created using the characteristics of the EDM technique. Buckingham’s theorem was used to develop a semi-empirical surface roughness prediction model. The semi-empirical model’s predictions were in good agreement with the experimental studies, and the built empirical model based on physical features of the cermet tooltip was tested using dimensional analysis.

scholarly journals Sliding abrasive wear when combining WEDM conditions and polishing treatment on H13 disks over 1045 carbon steel pins

2021 ◽  
Author(s):  
Antonio J. Sánchez Egea ◽  
Vitaliy Martynenko ◽  
Alejando Simoncelli ◽  
Gil Serrancoli ◽  
Daniel Martínez Krahmer
Keyword(s):  
Surface Roughness ◽  
Surface Properties ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Wire Electrical Discharge Machining ◽  
Initial Surface ◽  
Friction Coefficients ◽  
Surface Conditions ◽  
Aisi 1045

AbstractForging dies are crucial in forging to manufacture accurate workpieces. These dies are generally made of AISI H steel series and hardened and tempered medium carbon alloy steel. Dies are processed by using high-speed milling + polishing or electrical discharge machining + polishing. The surface quality of the workpiece depends on the surface properties of these dies, where surface roughness, material hardness, and wear evolution of their surfaces are critical aspects to consider. This research analyzes different wire electrical discharge machining surface conditions combined with polishing treatment to describe their influence on friction and wear. Wire electrical discharge machining defines the disks’ surface properties in finishing and roughing conditions, and polishing treatment varies in time and paper sand depending on the roughness. Abbott-Firestone curves and Rsk-Rku roughness parameters characterize the surface roughness of each studied configuration. Room temperature pin-on-disk tests were performed to analyze friction coefficients and wear rate for AISI 1045 pins and AISI H13 disks. On average, the highest (0.284) and the lowest (0.201) friction coefficients were found for the combination of finishing wire electrical discharge machining + polishing and roughing wire electrical discharge machining conditions, respectively. Scanning electron microscope images were taken to describe the wear tracks and pin degradation for different sliding abrasive configurations. The diagram correlating the surface morphology and the friction coefficient predicts the wear damage on initial surface conditions, which is crucial in the forging industry to determine tool maintenance or replacement.

Surface Study in a Non-conventional (Electrical Discharge Machining) Process for Grade 6 Titanium Material

2014 ◽  
Vol 68 (1) ◽  
Author(s):  
Md. Ashikur Rahman Khan ◽  
M. M. Rahman
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Machining Process ◽  
Machined Surface ◽  
Titanium Material ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Off Time

Electrical discharge machining (EDM) produces complex shapes and permits high-precision machining of any hard or difficult-to-cut materials. The performance characteristics such as surface roughness and microstructure of the machined face are influenced by numerous parameters. The selection of parameters becomes complicated. Thus, the surface roughness (Ra) and microstructure of the machined surface in EDM on Grade 6 titanium alloy are studied is this study. The experimental work is performed using copper as electrode material. The polarity of the electrode is maintained as negative. The process parameters taken into account in this study are peak current (Ip), pulse-on time (Ton), pulse-off time (Toff), and servo-voltage (Sv). A smooth surface finish is found at low pulse current, small on-time and high off-time. The servo-voltage affects the roughness diversely however, a finish surface is found at 80 V Sv. Craters, cracks and globules of debris are appeared in the microstructure of the machined part. The size and degree of craters as well as cracks increase with increasing in energy level. Low discharge energy yields an even surface. This approach helps in selecting proper process parameters resulting in economic EDM machining. 

Research on Machined Surface Quality for High Speed Turning Titanium Alloy Membrane Discs and Optimization of Cutting Parameters

2010 ◽  
Vol 33 ◽  
pp. 246-250
Author(s):  
Wei Zhang ◽  
Min Li Zheng ◽  
Ming Ming Cheng ◽  
Wen Yong Shi
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Empirical Model ◽  
High Speed ◽  
Cutting Parameters ◽  
Machined Surface ◽  
Cutting Parameter ◽  
High Speed Turning ◽  
Machined Surface Roughness ◽  
Cutting Parameter Optimization

By high speed turning experiment of aerospace engine titanium alloy membrane discs, it researches cutting parameters influence on machined surface roughness of titanium alloy membrane discs, meanwhile measures and analyzes machined surface topography. Machined surface roughness multi-linear regression empirical model of high speed end-surface turning titanium alloy membrane discs is established. Using cutting parameter combination obtained from cutting parameter optimization makes process verification experiment of high speed turning titanium alloy membrane discs. The results show that the established machined surface roughness empirical model of high speed turning titanium alloy membrane discs is credible in statistics, and the process verifying experiment effect is good by using optimized cutting parameters.

Experiment Research of Cutter Edge and Cutting Parameters Influence on Machined Surface Roughness for High Speed Milling Hardened Steel

2010 ◽  
Vol 136 ◽  
pp. 86-90 ◽  
Author(s):  
Wei Zhang ◽  
Min Li Zheng ◽  
Ming Ming Cheng ◽  
Quan Wan
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
End Milling ◽  
Cutting Parameters ◽  
Hardened Steel ◽  
Machined Surface ◽  
High Speed Milling ◽  
Ball End Milling ◽  
Edge Radius ◽  
Machined Surface Roughness

By using experiment cutter edge topography obtained by super depth three-dimension microscope, fits the cutter edge curve and calculate experiment cutter edge radius value; by high speed milling hardened steel experiment, individually researches cutter edge and cutting parameters influence on machined surface in high speed milling hardened steel with end-milling cutter and ball-end milling cutter. The experiment analysis results show that under the same cutting parameters condition, machined surface roughness in high speed end-milling cutter milling is better than in high speed ball-end milling; within experiment selected cutting parameter range, cutter edge radius is the main influence factor on machined surface roughness in high speed end- milling hardened steel, while the influence on machined surface roughness in high speed ball-end milling hardened steel is not obvious. In end-milling, when edge radius and milling depth are in the same order magnitude or the difference is not obvious, milling depth should be a little bigger than selected cutter edge radius value.

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