Novel approach towards finite element analysis of residual stresses in electrical discharge machining process

2015 ◽  
Vol 82 (9-12) ◽  
pp. 1805-1814 ◽  
Author(s):  
Mohammadreza Shabgard ◽  
Soleyman Seydi ◽  
Mirsadegh Seyedzavvar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Residual Stresses ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Machining Process ◽  
Element Analysis ◽  
Novel Approach

A Simulation Study on Rod Electrode Wear in Micro-EDM

2012 ◽  
Vol 472-475 ◽  
pp. 2426-2429 ◽  
Author(s):  
Hu Wang ◽  
Yuan Gang Wang ◽  
Meng Hua Wu ◽  
Xiao Peng Li ◽  
Yu Liu
Keyword(s):  
Adverse Effect ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Electrical Discharge ◽  
Skin Effect ◽  
Electrical Discharge Machining ◽  
Electrode Wear ◽  
Micro Edm ◽  
Element Analysis ◽  
Micro Electrical Discharge Machining

Electrode wear has a great adverse effect on the accuracy of Micro Electrical Discharge Machining (Micro-EDM) and impedes the improvement of Micro-EDM. In this study the distribution of electric field and current density was analyzed exhaustively in order to explore the generating mechanisms of rod electrode wear by finite element analysis and experiment. Experimental results indicated that corner wear occurred first, followed by side wear resulted from skin effect and debris in Micro-EDM, which was significant in enhancing the accuracy of machining.

On Overlapping the Pulses on Cumulative Microjets Stage at Ultrasonically Aided Electrical Discharge Machining

2016 ◽  
Vol 834 ◽  
pp. 126-131 ◽  
Author(s):  
Daniel Ghiculescu ◽  
Niculae Marinescu ◽  
Ovidiu Alupei
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Ultrasonic Frequency ◽  
Element Analysis ◽  
Machining Rate ◽  
Preliminary Experimental Data

The paper deals with a solution to increase the machining rate at electrical discharge machining aided by ultrasonics (EDM+US), i.e. the overlapping the voltage pulses provided by EDM generator on the cumulative microjets stage (CMS), which occurs at every final of an ultrasonic period by collective implosion of the gas bubbles from the working gap. This overlapping moves the limit of the removed material by a discharge from the boiling isothermal (at classic EDM) to melting isothermal (at EDM+US) as it is emphasized by the results of finite element analysis. The preliminary experimental data analyzed in the paper are obtained in case of random overlapping at ultrasonic frequency of 20 kHz. They demonstrate an increase of machining rate with more than 300% at EDM+US in comparison with classic EDM in the same working conditions.

scholarly journals Research on a 3-DOF Motion Device Based on the Flexible Mechanism Driven by the Piezoelectric Actuators

Micromachines ◽  
2018 ◽  
Vol 9 (11) ◽  
pp. 578 ◽  
Author(s):  
Bingrui Lv ◽  
Guilian Wang ◽  
Bin Li ◽  
Haibo Zhou ◽  
Yahui Hu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Machining Process ◽  
Element Analysis ◽  
3D Motion ◽  
Compliance Modeling ◽  
The Matrix ◽  
Static Performance ◽  
Flexible Mechanism

This paper describes the innovative design of a three-dimensional (3D) motion device based on a flexible mechanism, which is used primarily to produce accurate and fast micro-displacement. For example, the rapid contact and separation of the tool and the workpiece are realized by the operation of the 3D motion device in the machining process. This paper mainly concerns the device performance. A theoretical model for the static performance of the device was established using the matrix-based compliance modeling (MCM) method, and the static characteristics of the device were numerically simulated by finite element analysis (FEA). The Lagrangian principle and the finite element analysis method for device dynamics are used for prediction to obtain the natural frequency of the device. Under no-load conditions, the dynamic response performance and linear motion performance of the three directions were tested and analyzed with different input signals, and three sets of vibration trajectories were obtained. Finally, the scratching experiment was carried out. The detection of the workpiece reveals a pronounced periodic texture on the surface, which verifies that the vibration device can generate an ideal 3D vibration trajectory.

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