scholarly journals Observation of Material Removal Process by Single Pulse Discharge in Air

2018 ◽  
Vol 52 (129) ◽  
pp. 31-37 ◽  
Author(s):  
Takayuki TANI ◽  
Yoshiki TSUJITA ◽  
Hiromitsu GOTOH ◽  
Naotake MOHRI
Keyword(s):  
Material Removal ◽  
Pulse Discharge ◽  
Single Pulse ◽  
Removal Process

scholarly journals Research on Shape Change of Multimaterial Electrode for EDM

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Wenjian Wang ◽  
Yu Liu ◽  
Wenchao Zhang ◽  
Fujian Ma ◽  
Dapeng Yang ◽  
...  
Keyword(s):  
Material Removal ◽  
Shape Change ◽  
Pulse Discharge ◽  
Single Pulse ◽  
Machining Process ◽  
Die Steel ◽  
Electrode Shape ◽  
Simulation Strategy ◽  
Feed Strategy ◽  
Simulation Results

The shape change law of a multimaterial electrode in EDM was studied, and a cosimulation between ANSYS and MATLAB of electrode shape change of the multimaterial electrode and workpiece was established. Element birth and death in ANSYS was used to obtain the removal volume in a single-pulse discharge, and the electrode feed strategy, material removal, and renewal strategy are considered to establish the shape simulation strategy. Then, a program based on MATLAB software was compiled to simulate the machining process and predict the shape change of the multimaterial electrode of different combinations. The experiments of different multimaterial electrodes were carried out with the die steel as the workpiece. The simulation results were compared with the experimental results to verify the effectiveness of the simulation model.

scholarly journals Thermodynamic Simulation Modeling Analysis and Experimental Research of Vertical Ultrasonic Vibration Assisted EDM

2021 ◽  
Author(s):  
Yinghuai Dong ◽  
Jiajun Liu ◽  
Guangyan Li ◽  
Yan Wang
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Material Removal ◽  
Thermodynamic Simulation ◽  
Single Pulse ◽  
Ultrasonic Energy ◽  
Machining Efficiency ◽  
Removal Process ◽  
Heat Transfer Theory ◽  
Material Removal Model

Abstract Compared with traditional EDM, ultrasonic vibration assisted EDM ((UEDM)) shows better performance in machining efficiency and surface quality. But the material removal process of UEDM is complex, and there are many influencing factors, so it is difficult to describe the material removal process accurately. In this study, based on the voltage variation during UEDM processing and combined with the heat transfer theory, the material removal model of TC4 titanium alloy under the condition of single pulse vertical ultrasonic vibration UEDM was established, and the material removal process of UEDM under different amplitudes was analyzed. The machining efficiency and surface quality of UEDM with different ultrasonic energy under the condition of vertical ultrasonic vibration are obtained verified by UEDM experiments. The best ultrasonic energy under different current can be obtained by adjusting the current and ultrasonic vibration energy, which can improve the efficiency of UEDM.

Gap Phenomena of Ultrasonic Vibration Assisted Electrical Discharge Machining in Gas

2008 ◽  
Vol 375-376 ◽  
pp. 500-504
Author(s):  
Qin He Zhang ◽  
Jian Hua Zhang ◽  
Shu Peng Su ◽  
Qing Gao
Keyword(s):  
Ultrasonic Vibration ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Pulse Discharge ◽  
Single Pulse ◽  
Environment Pollution ◽  
Dielectric Fluids ◽  
Simple Tool ◽  
Spark Plasma

Ultrasonic vibration aided electrical discharge machining (UEDM) in gas is a new machining technology developed in recent years. This technology uses air or oxygen as dielectric and ultrasonic vibration is applied to the workpiece during machining. UEDM in gas can avoid environment pollution, the most serious disadvantage of conventional EDM in kerosene-based oil or other dielectric fluids, and it is environmental-friendly. The technology also has virtues of wide applications, high machining efficiency, and simple tool electrodes and so on. In this paper, the formation and transformation of the spark plasma and the mechanism of material removal during a single pulse discharge are introduced.

Research on the influence of the discharge breakdown process on the crater formation during EDM

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wenchao Zhang
Keyword(s):  
Mathematical Model ◽  
Discharge Channel ◽  
Electrical Discharge Machining ◽  
Pulse Discharge ◽  
Single Pulse ◽  
Crater Formation ◽  
Content Type ◽  
Breakdown Process ◽  
Positive Ions ◽  
Fluid Coupling

PurposeThis paper aims to study the breakdown, oscillation and vanishing of the discharge channel and its influence on crater formation with simulation and experimental methods. The experiment results verified the effect of the oscillating characteristics of the discharge channel on the shape of the crater.Design/methodology/approachA mathematical model that considers the magnetohydrodynamics (MHD) and the discharge channel oscillation was established. The micro process of discharging based on magnetic-fluid coupling during electrical discharge machining (EDM) was simulated. The breakdown, oscillation and vanishing stage of the discharge channel were analyzed, and the crater after machining was obtained. Finally, a single-pulse discharge experiment during EDM was conducted to verify the simulation model.FindingsDuring the breakdown of the discharge channel, the electrons move towards the center of the discharge channel. The electrons at the end diverge due to the action of water resistance, making the discharge channel appear wide at both ends and narrow in the middle, showing the pinch effect. Due to the mutual attraction of electrons and positive ions in the channel, the transverse oscillation of the discharge channel is shown on the micro level. Therefore, the position of the discharge point on the workpiece changes. The longitudinal oscillation in the discharge channel causes the molten pool on the workpiece to be ejected due to the changing pressure. The experimental results show that the shape of the crater is similar to that in the simulation, which verifies the correctness of the simulation results and also proves that the crater generated by the single pulse discharge is essentially the result of the interaction between transverse wave and longitudinal wave.Originality/valueIn this paper, the simulation of the discharge breakdown process in EDM was carried out, and a new mathematical model that considers the MHD and the discharge channel oscillation was established. Based on the MHD module, the discharge breakdown, oscillation and vanishing stages were simulated, and the velocity field and pressure field in the discharge area were obtained.

scholarly journals Experimental Investigation of Productivity, Specific Energy Consumption, and Hole Quality in Single-Pulse, Percussion, and Trepanning Drilling of IN 718 Superalloy

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4610 ◽  
Author(s):  
Shoaib Sarfraz ◽  
Essam Shehab ◽  
Konstantinos Salonitis ◽  
Wojciech Suder
Keyword(s):  
Experimental Investigation ◽  
Energy Consumption ◽  
Specific Energy ◽  
Material Removal ◽  
Specific Energy Consumption ◽  
Single Pulse ◽  
Laser Drilling ◽  
Fibre Laser ◽  
Hole Quality ◽  
Multi Objective

Laser drilling is a high-speed process that is used to produce high aspect ratio holes of various sizes for critical applications, such as cooling holes in aero-engine and gas turbine components. Hole quality is always a major concern during the laser drilling process. Apart from hole quality, cost and productivity are also the key considerations for high-value manufacturing industries. Taking into account the significance of improving material removal quantity, energy efficiency, and product quality, this study is performed in the form of an experimental investigation and multi-objective optimisation for three different laser drilling processes (single-pulse, percussion, and trepanning). A Quasi-CW fibre laser was used to produce holes in a 1 mm thick IN 718 superalloy. The impacts of significant process parameters on the material removal rate (MRR), specific energy consumption (SEC), and hole taper have been discussed based on the results collected through an experimental matrix that was designed using the Taguchi method. The novelty of this work focuses on evaluating and comparing the performance of laser drilling methods in relation to MRR, SEC, and hole quality altogether. Comparative analysis revealed single-pulse drilling as the best option for MRR and SEC as the MRR value reduces with percussion and trepanning by 99.70% and 99.87% respectively; similarly, percussion resulted in 14.20% higher SEC value while trepanning yielded a six-folds increase in SEC as compared to single-pulse drilling. Trepanning, on the other hand, outperformed the rest of the drilling processes with 71.96% better hole quality. Moreover, optimum values of parameters simultaneously minimising SEC and hole taper and maximising MRR are determined using multi-objective optimisation.

scholarly journals Observation of Material Removal Process by Single Discharge in Air Gap

Procedia CIRP ◽  
2018 ◽  
Vol 68 ◽  
pp. 276-279 ◽  
Author(s):  
Tani Takayuki ◽  
Yoshiki Tsujita ◽  
Hiromitsu Gotoh ◽  
Masaaki Okada ◽  
Naotake Mohri
Keyword(s):  
Material Removal ◽  
Air Gap ◽  
Removal Process ◽  
Single Discharge
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