Micro-Electrical Discharge Machining for Machining Micro-Holes

2019 ◽  
pp. 23-34
Author(s):  
M. S. Nagrale ◽  
S. A. Mastud
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Micro Electrical Discharge Machining ◽  
Micro Holes

Research the Molybdenum Alloy Micro EDM Micro-Holes

2011 ◽  
Vol 411 ◽  
pp. 315-318 ◽  
Author(s):  
Lan Chen
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Molybdenum Alloy ◽  
Micro Edm ◽  
Traditional Methods ◽  
Micro Electrical Discharge Machining ◽  
Micro Holes ◽  
On Line ◽  
Better Than

In the field of micromachining, micro electrical discharge machining (MEDM) is an important and perfect machining method for high rigid or high wearable materials, which is better than traditional methods of machining. MEDM technology is used to manufacture on-line electrodes and then minimum micro shafts with diameter of 15μm were made with these electrodes. A series of different micro-holes (e.g. Φ40μm、Φ50μm、Φ60μm) on pieces of molybdenum were manufactured with different parameters. Wastage of electrode rule was also studied.

Some Issues Regarding Finite Element Modelling of Micro-Electrical Discharge Machining Aided by Ultrasonics

2015 ◽  
Vol 651-653 ◽  
pp. 683-688 ◽  
Author(s):  
Daniel Ghiculescu ◽  
Niculae Marinescu ◽  
Ovidiu Alupei ◽  
Nicoleta Carutasu
Keyword(s):  
Finite Element ◽  
Electrical Discharge ◽  
Finite Element Modelling ◽  
Electrical Discharge Machining ◽  
Removal Mechanism ◽  
Optimization Strategy ◽  
Element Modelling ◽  
Micro Electrical Discharge Machining ◽  
Cavitation Effect ◽  
Micro Holes

The paper deals with finite element modelling (FEM) of the process of micro-electrical discharge machining of micro-holes aided by ultrasonic longitudinal oscillations of workpiece (μEDM+US). FEM of the process comprises two components: the thermal one due to μEDM removal mechanism, and the ultrasonic one caused by cavitation effect generated inside the lateral working gap. The FEM results obtained are validated by experimental data in terms of craters dimensions produced by single discharges, leading to optimization strategy of process parameters.

Swing Mechanism for Micro EDM Drilling of Fuel Jet Nozzles

2012 ◽  
Vol 591-593 ◽  
pp. 391-395 ◽  
Author(s):  
Hao Tong ◽  
Yong Li ◽  
Long Zhang
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Micro Edm ◽  
Taper Angle ◽  
Micro Electrical Discharge Machining ◽  
Electrode Wire ◽  
Fuel Jet ◽  
Micro Holes ◽  
Edm Drilling ◽  
Fixed Center

To improve the spray effects of fuel-jet nozzles, the deep micro-holes of the nozzles require taper angle 0°-2° along jet direction. In this paper, a taper-swinging mechanism (TSM) is designed to swing a taper angle on an electrode wire for micro electrical discharge machining (EDM) of micro-taper holes. The features of TSM are as follows. First, the electrode wire and its guider are swung simultaneously during the micro-EDM drilling. Second, the center of a fixed sphere as the taper vertex is positioned on the surface of workpiece. Thirdly, non-rotating of the electrode wire and the fixed center avoid the errors of the swing motion. The taper holes with the corresponding angles of 0.12°, 0.40°, 0.83°, and 1.32° were machined by using TSM. The batch production showed that the consistency accuracy of holes’ diameters reached 4μm. In addition, the TSM was applied in a micro EDM machine tool.

Electrical Discharge Machining of Micro Holes on Titanium Sheets

2011 ◽  
Author(s):  
Gianluca D’Urso ◽  
Michela Longo ◽  
Giancarlo Maccarini ◽  
Chiara Ravasio
Keyword(s):  
Process Parameters ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Machining Accuracy ◽  
Micro Electrical Discharge Machining ◽  
Aspect Ratios ◽  
Micro Holes ◽  
Electron Microscopes

Micro-Electrical Discharge Machining (μEDM) has become a widely accepted non-traditional material removal process for micro-manufacture of conductive materials considered difficult to be cut using traditional machining technologies. Moreover, EDM is an ideal process for obtaining burr-free micron-size apertures with high aspect ratios. Aim of this work was to investigate the feasibility of drilling micro holes on titanium using μ-EDM technology. Titanium plates having a thickness equal to 0.5 mm were taken into account and the holes were performed using a carbide electrode having a diameter equal to 0.3 mm. The Design Of Experiment (DOE) method was used for planning the experimental campaign and ANOVA techniques were applied to study the relationship between process parameters and final output. In particular, the most important process parameters such as peak current, pulse duration, frequency and electrode rotation speed were investigated as a function of material removal rate, wear rate and machining accuracy. Geometrical and dimensional analyses were carried out on micro-holes using both optical and scanning electron microscopes to evaluate both the over cut and the rate of taper.

Recent Patents on Micro-EDM Milling

2020 ◽  
Vol 13 (3) ◽  
pp. 219-229
Author(s):  
Baocheng Xie ◽  
Jianguo Liu ◽  
Yongqiu Chen
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Three Dimensional ◽  
Processing Method ◽  
Electrode Wear ◽  
Micro Edm ◽  
Processing Efficiency ◽  
Processing Methods ◽  
Machining Quality ◽  
Micro Electrical Discharge Machining

Background: Micro-Electrical Discharge Machining (EDM) milling is widely used in the processing of complex cavities and micro-three-dimensional structures, which is a more effective processing method for micro-precision parts. Thus, more attention has been paid on the micro-EDM milling. Objective : To meet the increasing requirement of machining quality and machining efficiency of micro- EDM milling, the processing devices and processing methods of micro-EDM milling are being improved continuously. Methods: This paper reviews various current representative patents related to the processing devices and processing methods of micro-EDM milling. Results: Through summarizing a large number of patents about processing devices and processing methods of micro-EDM milling, the main problems of current development, such as the strategy of electrode wear compensation and the development trends of processing devices and processing methods of micro-EDM milling are discussed. Conclusion: The optimization of processing devices and processing methods of micro-EDM milling are conducive to solving the problems of processing efficiency and quality. More relevant patents will be invented in the future.

Optimization of μEDM process assisted with rotating magnetic pulling force and ultrasonic vibration

2021 ◽  
pp. 095440892098440
Author(s):  
Gurpreet Singh ◽  
DR Prajapati ◽  
PS Satsangi
Keyword(s):  
Ultrasonic Vibration ◽  
Material Removal Rate ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Machining Process ◽  
Micro Electrical Discharge Machining ◽  
Pulling Force ◽  
Tool Rotation

The micro-electrical discharge machining process is hindered by low material removal rate and low surface quality, which bound its capability. The assistance of ultrasonic vibration and magnetic pulling force in micro-electrical discharge machining helps to overcome this limitation and increase the stability of the machining process. In the present research, an attempt has been made on Taguchi based GRA optimization for µEDM assisted with ultrasonic vibration and magnetic pulling force while µEDM of SKD-5 die steel with the tubular copper electrode. The process parameters such as ultrasonic vibration, magnetic pulling force, tool rotation, energy and feed rate have been chosen as process variables. Material removal rate and taper of the feature have been selected as response measures. From the experimental study, it has been found that response output measures have been significantly improved by 18% as compared to non assisted µEDM. The best optimal combination of input parameters for improved performance measures were recorded as machining with ultrasonic vibration (U1), 0.25 kgf of magnetic pulling force (M1), 600 rpm of tool rotation (R2), 3.38 mJ of energy (E3) and 1.5 mm/min of Tool feed rate (F3). The confirmation trail was also carried out for the validation of the results attained by Grey Relational Analysis and confirmed that there is a substantial improvement with both assistance applied simultaneously.

Micro electrical discharge machining in nitrogen plasma jet

2018 ◽  
Vol 51 ◽  
pp. 198-207 ◽  
Author(s):  
Rimao Zou ◽  
Zuyuan Yu ◽  
Chengyang Yan ◽  
Jianzhong Li ◽  
Xin Liu ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Micro Electrical Discharge Machining
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