Comparative study on discharge conditions in micro-hole electrical discharge machining of tungsten carbide (WC-Co) material

2009 ◽  
Vol 19 ◽  
pp. s114-s118 ◽  
Author(s):  
Hyun-Seok TAK ◽  
Chang-Seung HA ◽  
Dong-Hyun KIM ◽  
Ho-Jun LEE ◽  
Hae-June LEE ◽  
...  
Keyword(s):  
Comparative Study ◽  
Tungsten Carbide ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Micro Hole

Mathematical modelling and comparative study of the machining characteristics in ultrasonic-assisted electrical discharge machining of cemented tungsten carbide (WC—10%Co)

2009 ◽  
Vol 223 (9) ◽  
pp. 1115-1126 ◽  
Author(s):  
M R Shabgard ◽  
M R Farahmand ◽  
A Ivanov
Keyword(s):  
Comparative Study ◽  
Tungsten Carbide ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Machining Parameters ◽  
Machining Performance ◽  
Ultrasonic Assisted ◽  
Pulse On Time ◽  
Ultrasonic Assisted Edm ◽  
Cemented Tungsten Carbide

The phenomena occurring between the electrodes in electrical discharge machining (EDM) are still not fully understood. Poor quantitative knowledge of the sources of variability affecting this process hinders the identification of its natural tolerance limits. This paper presents a systematic methodology for developing statistical models to show the relationship between important machining performance data (material removal rate (MRR), tool wear ratio (TWR), and surface roughness Ra) and the input machining parameters (pulse current and pulse-on time) in the EDM and ultrasonic-assisted EDM (US/EDM) of tungsten carbide. The models obtained were used to analyse the effects of input parameters on machining performance. A comparative study was conducted to determine the influence of ultrasonic vibration of the tool on machining performance. The results show that the MRR is significantly increased in ultrasonic-assisted EDM of cemented tungsten carbide (WC—10%Co), especially in finishing modes, and can be up to four times greater than that of conventional EDM. The TWR and Ra values are also increased slightly in US/EDM. The mathematical models presented can be used for optimization of the machining parameters.

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.

scholarly journals Research on the Real-time Wear of Wire Electrode During the Electrical Discharge Machining (EDM) of Precision Micro Hole

Procedia CIRP ◽  
2018 ◽  
Vol 68 ◽  
pp. 565-568
Author(s):  
Liu Jianyong ◽  
Guo jianmei ◽  
Ding Liantong ◽  
Cai Yanhua ◽  
Sun Dongjiang
Keyword(s):  
Real Time ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Wire Electrode ◽  
The Real ◽  
Micro Hole

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.

Fuzzy Logic Control System for Micro-Hole Electrical Discharge Machining

2007 ◽  
Author(s):  
Chen-Chun Kao ◽  
Scott F. Miller ◽  
Albert J. Shih
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Ignition Delay ◽  
Fuzzy Logic Control ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Logic Control ◽  
Input Parameters ◽  
Micro Hole ◽  
Adaptive Fuzzy Logic

An advanced micro-hole electrical discharge machining (EDM) system with the adaptive fuzzy logic control and precision piezoelectric stage is developed in this study. A high-speed EDM monitoring system is implemented to measure the gap voltage, current, and ignition delay time, which are used to derive three input parameters, the average gap voltage, deviation of spark ratio, and change of deviation of spark ratio, for the fuzzy logic control. Servo displacement and speed of the piezoelectric stage during each data acquisition cycle are real-time synthesized by the adaptive fuzzy logic controller. Effects of the single and multiple input parameters, ignition delay threshold value, and maximum servo displacement and speed on the EDM drilling process are experimentally studied. Design of experiments (DOE) is applied to investigate the correlation of fuzzy logic control parameters. The optimal EDM parameter values are searched via the genetic algorithm. The optimal search result is experimentally validated. The fuzzy logic EDM control system has demonstrated the efficiency and stability in micro-hole drilling by reducing the frequency of irregular discharges and the drilling time.

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