Effect of processing parameters on structural features of tungsten carbide after electrical discharge machining (EDM)

2008 ◽  
Vol 2 (2) ◽  
pp. 65-71
Author(s):  
C. P. Khatter ◽  
O. P. Pandey
Keyword(s):  
Tungsten Carbide ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Processing Parameters ◽  
Structural Features

Surface Modification Process by Electrical Discharge Machining with Tungsten Carbide Powder Mixing in Kerosene Fluid

2019 ◽  
Vol 889 ◽  
pp. 115-122
Author(s):  
Van Tao Le ◽  
Tien Long Banh ◽  
Xuan Thai Tran ◽  
Nguyen Thi Hong Minh
Keyword(s):  
Surface Roughness ◽  
Tungsten Carbide ◽  
Electrical Discharge ◽  
Alloy Powder ◽  
Electrical Discharge Machining ◽  
Carbide Powder ◽  
Micro Hardness ◽  
Hard Materials ◽  
Tungsten Carbide Powder ◽  
Better Than

Electrical discharge machining (EDM) process is widely used to process hard materials in the industry. The process of electrical discharge is changed and called PMEDM when alloy powder is added in the oil dielectric. In the current study, the effect of tungsten carbide alloy powder added in the dielectric on the surface roughness (Ra) and the micro hardness of surface (HV) status of the workpiece SKD61 after machining is investigated. Studies show that the surface roughness and the micro hardness of surface obtained by PMEDM is generally better than that by normal EDM. The method can be applied for improving surface quality such as improving strengthening of molds and machine parts.

Fabrication of Micropins Using Micro Turning Tools

2012 ◽  
Vol 523-524 ◽  
pp. 76-80 ◽  
Author(s):  
Takuya Furukawa ◽  
Yosuke Nomura ◽  
Kazuyuki Harada ◽  
Kai Egashira
Keyword(s):  
Tungsten Carbide ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Cutting Tools ◽  
Depth Of Cut ◽  
Feed Speed ◽  
Tool Breakage ◽  
Micro Cutting ◽  
Hard Materials ◽  
Micro Turning

The turning of straight micropins with a diameter smaller than 10 µm, which has not been reported so far, was carried out using micro turning tools made of cemented tungsten carbide. Tools of 50 µm diameter were fabricated by electrical discharge machining, which is suitable for fabricating micro cutting tools because it can deal with hard materials and carry out micromachining. A turning machine designed especially for micro turning tools was used in the experiments. A brass workpiece was turned using a tool with a length of cut of 100 µm at a feed speed of 3.0 µm/s, feed per revolution of 0.06 µm and depth of cut of 10–11 µm. As a result, a straight micropin of 7.5 µm diameter and 80 µm length was successfully turned. Furthermore, turning was also performed using a tool with a length of cut of 50 µm at a feed speed of 3.0 µm/s, feed per revolution of 0.06 µm and depth of cut of 8.5–20 µm to fabricate a straight micropin of 3 µm diameter and 30 µm length. This micropin is the pin with the smallest ever diameter fabricated by turning, to the best of our knowledge, indicating the possibility of further minimization of the machinable size in turning. Turning properties were also investigated to determine the maximum depth of cut and feed speed that can be employed without tool breakage.

Machining Deep Micro Holes by EDM with USM in Inversion Installing

2009 ◽  
Vol 626-627 ◽  
pp. 321-326
Author(s):  
Bao Xian Jia ◽  
D.S. Wang ◽  
Jing Zhe Guo
Keyword(s):  
Aspect Ratio ◽  
Ultrasonic Vibration ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Structural Features ◽  
Ultrasonic Machining ◽  
Micro Holes ◽  
Exploratory Experiment ◽  
A New Technique ◽  
Working Liquid

In order to obtain micro holes with high aspect ratio, a new technique of machining deep micro holes by combining EDM (Electrical Discharge Machining) with USM (Ultrasonic Machining) in inversion installing is researched. The workpiece is over the electrode. The ultrasonic vibration is affixed to the electrode. The workpiece and electrode are all immersed in working liquid. The debris generated by EDM is dropped out the hole from the gap between the electrode and the hole wall by the gravity and the pumping effect of ultrasonic vibration, so as to increasing the machining velocity and machined depth. The structural features of the machining device are described, and the exploratory experiment is carried out. The corresponding process relations are found out, which can provide references for further study of this technique. The micro holes with larger than 25 in aspect ratio are machined.

Analysis of the electrical discharge machining (EDM) performance on Ramor 550 armor steel

2020 ◽  
Vol 62 (5) ◽  
pp. 481-491
Author(s):  
Engin Nas
Keyword(s):  
Discharge Current ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Processing Parameters ◽  
Depth Of Cut ◽  
Armor Steel ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Off Time

Abstract This study investigated the electrical discharge machining (EDM) performance of Ramor 500 Armor steel, a material used in the defense industry for armor production. In addition, the surface quality and amount of material wear of the treated surfaces were determined using different electrical discharge processing parameters for a copper electrode including pulse on-time (99, 150, 225, 300, 351 μs), pulse off-time (10, 15, 23, 30, 35 μs), and discharge current (3, 4, 6, 8, 9 A), at a constant pressure of 1 mm depth of cut. As a result of the experiments, the values related to the material removal rate (MRR) and the surface roughness (Ra) were obtained and the findings analyzed via response surface methodology (RSM). The increase in amperage and pulse on time resulted in an increase in Ra and MRR values. The minimum and maximum Ra and MRR values emerged at currents of 3 and 9 A, respectively. In the experiments performed applying currents of between 3 and 9 A, the white layer widths were measured as 0.0474 mm and 0.0915 mm, respectively. The statistical test results showed that the most effective processing parameters for the MRR were the discharge current amperage (49.01 %) and the pulse off-time (16.51 %), whereas the most effective parameter for the Ra value was the discharge current amperage (79.07 %).

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