Study on Die Surface Coating by Electric Discharging Machining

2012 ◽  
Vol 490-495 ◽  
pp. 2619-2623 ◽  
Author(s):  
Xiao Hai Li ◽  
De Cheng Wang ◽  
Yu Fang
Keyword(s):  
Surface Modification ◽  
Power Supply ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Coating Layer ◽  
Pulse Power ◽  
Working Fluid ◽  
Pulse Power Supply ◽  
Die Surface ◽  
New Type

A new method of die surface modification by ordinary Electrical Discharge Machining (EDM) is described. First, the surface modification mechanism by EDM is studied, which is different with ordinary EDM. Secondly, the influence of important electric parameters on the effect of electric discharging coating in working fluid is analyzed, which is helpful to improve the coating layer. At last, the new type special pulse power supply with additional pulse current is designed. The special pulse power supply for electrical discharge coating behaves well, and the compacted coating layer without cracks deposited on the surface of die by EDM can be obtained, which can prolong the life of die

Tangent Hole Machined by Micro Electrical Discharge Machining

2009 ◽  
Vol 419-420 ◽  
pp. 821-824
Author(s):  
Mao Sheng Li ◽  
Guan Xin Chi ◽  
Zhen Long Wang ◽  
Yu Kui Wang
Keyword(s):  
Power Supply ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Pulse Power ◽  
Working Fluid ◽  
Machining Efficiency ◽  
Pulse Power Supply ◽  
Relative Wear ◽  
Micro Electrical Discharge Machining ◽  
Hole Machining

Based on a self-developed pulse power supply, effects of working fluid to machining efficiency and relative wear of electrode are studied. tangent-hole machining experiments are designed and carried out. Tangent holes with 0.75mm and 0.56mm diameters on some nozzles are obtained.

Direct Measurement of Electrode Movement During Electrical Discharge Machining by Means of Automatic Discharge Gap Controller

2010 ◽  
Vol 4 (6) ◽  
pp. 552-561 ◽  
Author(s):  
Masahiko Kita ◽  
◽  
Tohru Ishida ◽  
Yoshimi Takeuchi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Power Supply ◽  
Research Group ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Working Fluid ◽  
Method Of Measurement ◽  
Discharge Gap

This study deals with the development of a new method of directly measuring the movement of an electrode during normal electrical discharge machining (EDM) and the movement of an electrode during EDM by means of an automatic discharge gap controller (ADGC) devised by our research group. The ADGC, which mainly consists of a bidirectional actuator using a shape memory alloy (SMA) and an electrode and power supply for EDM, can sustain stable EDMby autonomously and automatically controlling the position of the electrode to keep the discharge gap appropriate. However, the movement of the electrode being controlled by the ADGC cannot be directly measured due to itsminute, high-speed, vibration-like movements inside the working fluid during EDM. This means that there is no way to prove that the ADGC actually controls the position of the electrode so as to maintain a suitable discharge gap for continuing stable EDM. This also means that there is no way to evaluate the movement of the electrode quantitatively and to design or optimize the structure of an ADGC so as to give the ADGC the desired or best performance. Therefore, a method to directlymeasure the electrodemovement by an ADGC is devised in this study. The results obtained in the measurement experiments using this method of measurement prove that the ADGC actually moves its electrode to achieve stable EDM, and they allow the movement of the electrode to be evaluated quantitatively.

Control Strategy for Electrical Discharge Machining (EDM) Pulse Power Generator

2014 ◽  
Vol 554 ◽  
pp. 643-647 ◽  
Author(s):  
Minhat Ade Erawan ◽  
Khamis Nor Hisham ◽  
Azli Yahya ◽  
Andromeda Trias ◽  
Juli Purwanto Nugroho Kartiko ◽  
...  
Keyword(s):  
Power Supply ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Pulse Power ◽  
Dielectric Fluid ◽  
Hard Material ◽  
Machining Processes ◽  
Power Generator ◽  
Pulse Power Generator ◽  
Control Feedback

Electrical Discharge Machining (EDM) is a advanced machine that can control electrical spark to erode metal on the workpiece. In manufacturing, EDM is used on hard material parts that are extremely difficult to machine by conventional machining processes. EDM system consists of a shaped tool and the work piece, which are connected to a power supply and placed in a dielectric fluid. EDM pulse power generator applies voltage and current pulses between the electrode and workpiece to generate sparks through the gap. To obtain the optimum metarial removal rate (MRR), a good alternative is to improve the gap voltage and gap current. A proposed solution to these issue is combining ultracapacitor bank to the main power supply circuit for EDM machines. The control feedback of this research is designed to make sure that the current on DC bus is maintained at current setting during the machining processes.

Research on Energy-Saving EDM Pulse Power Supply

2008 ◽  
Vol 375-376 ◽  
pp. 714-718
Author(s):  
Yu Kui Wang ◽  
Bo Yan Song ◽  
Zhen Long Wang ◽  
Wan Sheng Zhao
Keyword(s):  
Energy Saving ◽  
Power Factor ◽  
Power Supply ◽  
High Speed ◽  
Closed Loop ◽  
Pulse Generator ◽  
Electrical Discharge Machining ◽  
Pulse Power ◽  
Electrode Wear ◽  
Pulse Power Supply

The performance and stability of output of electrical discharge machining (EDM) are determined by the output of EDM pulse power supply. In order to resolve disadvantages of conventional pulse power supply, such as undesirable efficiency and low power factor, the prototype design of energy-saving EDM pulse power supply is developed. It is composed of such three stages as a single-phase active power factor correction (PFC) pre-regulator, a full-bridge phase shift zero voltage switching (FB-PS-ZVS) converter based on complex control paralleled of machining current closed-loop and voltage closed-loop at period of spark gap insulation, and a pulse generator based on machining sequence control. The PFC pre-regulator contributes to a great increase to about 0.95 in its power factor. The efficiency of the new system is considerably increased to about 70% due to design of ZVS. The pulse generator contributes to the pulse machining current without a tail. Experiment results demonstrates that the prototype is capable of low electrode wear, high speed, stable machining.

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