Analysis on hole overcut during micro-EDM of Inconel 718

2021 ◽  
Author(s):  
Anshuman Das ◽  
Smita Padhan ◽  
Sudhansu Ranjan Das
Keyword(s):  
Inconel 718 ◽  
Micro Edm

EXPERIMENTAL INVESTIGATION OF MICRO-EDM OPERATION IN INCONEL 718

2021 ◽  
pp. 2150102
Author(s):  
MAYANK CHOUBEY ◽  
K. P. MAITY
Keyword(s):  
Experimental Investigation ◽  
Inconel 718 ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Micro Edm ◽  
Machining Processes ◽  
Machining Time ◽  
Machine Material ◽  
Micro Holes ◽  
Unconventional Machining

The increasing trends towards miniaturized and lightweight components for various engineering and aerospace applications by unconventional machining the demand for micro-electrical discharge machining (EDM) have become increasingly wide. Micro-EDM is one of the most promising unconventional machining processes as compared to other unconventional machining due to its lower cost, ease of operation, and accuracy. This research explores the experimental investigation of micro-EDM operation on hard and difficult to machine material Inconel 718. The micro-holes were fabricated on an Inconel 718 workpiece with a copper electrode. The influence of input process parameters on material removal rate (MRR), machining time, and quality of the fabricated micro-holes were studied. Overcut and taperness of the fabricated micro-sized through holes were measured to address the accuracy of the fabricated micro-holes in micro-EDM operation. Experimental results reveal that the increase in current and voltage increases the MRR, and reduced machining time but at the cost of dimensional accuracy of the fabricated holes. The high value of current and voltage resulted in poor surface quality. The optimum machining condition that gives higher MRR with higher machining precision was obtained by experimenting while machining Inconel 718.

Machining Performance Characteristics of Inconel 718 Superalloy Due to Hole-Sinking Ultrasonic Assisted Micro-EDM

2018 ◽  
Vol 17 (01) ◽  
pp. 89-105 ◽  
Author(s):  
Param Singh ◽  
Vinod Yadava ◽  
Audhesh Narayan
Keyword(s):  
Thermal Conductivity ◽  
Inconel 718 ◽  
Performance Characteristics ◽  
Ultrasonic Power ◽  
Micro Edm ◽  
Machining Performance ◽  
Ultrasonic Assisted ◽  
Micro Holes ◽  
Inconel 718 Superalloy ◽  
Pulse On Time

Inconel 718 superalloy is widely used in aerospace industries for fabrication of the various components for aircraft engine because of its high strength at elevated temperature. It is an extremely difficult-to-machine material due to its work hardening nature and poor thermal conductivity. Creating micro-holes of high precision in this material is beyond the capability of conventional twist drill due to its low thermal conductivity. Micro-electrical discharge machining (micro-EDM) is a well-established process for the machining of any electrically conductive hard and brittle material, but due to very small feature size and narrow discharge gap, removal of debris becomes difficult, causes arcing and short-circuiting. In order to solve this problem, authors indigenously developed an innovative ultrasonic-assisted micro-EDM setup for workpiece vibration. The machining performance characteristics of Inconel 718 superalloy was studied using the developed setup in sinking configuration in terms of material removal rate (MRR), tool wear rate (TWR) and hole taper ([Formula: see text]) considering the effect of ultrasonic power, gap current, pulse on time and pulse off time. It was observed that higher ultrasonic power was more suitable for higher MRR, lower TWR and [Formula: see text]. It was also found from the results that 3 A gap current at 6[Formula: see text][Formula: see text]s pulse on time was appropriate for better MRR and 12[Formula: see text][Formula: see text]s pulse on time was more appropriate for low TWR and [Formula: see text]. The scanning electron microscope (SEM) analysis of created micro-holes was also performed with and without ultrasonic vibration to ensure the quality as well as accuracy.

Optimization of micro-EDM drilling of inconel 718 superalloy

2012 ◽  
Vol 66 (5-8) ◽  
pp. 1015-1023 ◽  
Author(s):  
Mustafa Ay ◽  
Ulaş Çaydaş ◽  
Ahmet Hasçalık
Keyword(s):  
Inconel 718 ◽  
Micro Edm ◽  
Inconel 718 Superalloy ◽  
Edm Drilling

Application of powder suspended in dielectric fluid for fine finish micro-EDM of Inconel 718

2014 ◽  
Vol 75 (1-4) ◽  
pp. 599-613 ◽  
Author(s):  
Gunawan S. Prihandana ◽  
Tutik Sriani ◽  
Muslim Mahardika ◽  
M. Hamdi ◽  
Norihisa Miki ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Dielectric Fluid ◽  
Micro Edm

Alloy Inconel 718 by 3D Micro-Electro Discharge Machining

2014 ◽  
Vol 590 ◽  
pp. 239-243 ◽  
Author(s):  
Piyapong Kumkoon ◽  
Chana Raksiri ◽  
Chaiyakorn Jansuwan
Keyword(s):  
Inconel 718 ◽  
Micro Edm ◽  
Optimal Parameters ◽  
Electro Discharge Machining ◽  
Debris Removal ◽  
Micro Drilling ◽  
Voltage Frequency ◽  
Off Time ◽  
Edm Drilling ◽  
Edm Process

This article aims to show the effects of the Micro-EDM process that influences the hole taper by comparing the parameters values during micro-drilling hole on the inconel 718 material. The condition of Micro-EDM drilling spark on the surface workpiece was 300 μm of depth and 200 μm of diameter tungsten carbide electrode. The experiment was carried out under the cover of hydrocarbon, using fluid dielectric cooling. The experiment parameters included on-time duty factor, off-time, voltage, frequency, and current, respectively. The experiment, it was found that the hole taper an immense effect on the machinability of drilling the workpieces, cause melting and recasting in the spark area, making a decrease in the ability of debris removal. Moreover, the experiment result, the tapered workpiece showed a minimized is 16.87 s, when using parameters at current 32 mA, frequency 150 Hz, and voltage 110 v, respectively. The optimal parameters to affected minimum hole taper is 0.195 degree, when using parameters at current 32 mA, frequency 130 Hz, and voltage 110 v, respectively.

Optimizing the Machining Parameters of Micro-EDM for Inconel 718

2012 ◽  
Vol 12 (10) ◽  
pp. 971-977 ◽  
Author(s):  
R. Manikandan ◽  
R. Venkatesan
Keyword(s):  
Inconel 718 ◽  
Machining Parameters ◽  
Micro Edm
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