Design and its Experiments of Micro Electrochemical Machining System

2010 ◽  
Vol 97-101 ◽  
pp. 2505-2508 ◽  
Author(s):  
Yuan Bo Li ◽  
Yong Jun Zhang ◽  
Zhong Ning Guo
Keyword(s):  
High Resolution ◽  
Power Supply ◽  
Pulse Width ◽  
Short Pulse ◽  
Electrochemical Machining ◽  
Pulse Frequency ◽  
Machining Accuracy ◽  
Micro Ecm ◽  
Machining System ◽  
Short Pulse Width

A micro Electrochemical Machining (ECM) system has been developed, and macro/micro complex feed mechanism has been presented in order to achieve high-resolution. A nanosecond pulse power supply for micro-ECM has been developed, and the minimum pulse width can reach 50 ns. Complementary chopper circuit has been designed to avoid waveform distortion, which can achieve higher pulse frequency. A series of ECM experiments using the machining system have been carried out, and results of tests have proved that high-resolution spindle, and high frequency, short pulse width power supply help to achieve better quality surface, higher machining accuracy.

Development of Ultra-Short Pulse Power Supply Applicable to Micro-ECM

2009 ◽  
Vol 626-627 ◽  
pp. 369-374 ◽  
Author(s):  
Yong Jun Zhang ◽  
Yong Jun Tang ◽  
Xiao Kang Liu ◽  
Z.N. Guo ◽  
F. Li
Keyword(s):  
Power Supply ◽  
Short Pulse ◽  
Short Circuit ◽  
Pulse Power ◽  
Step Motor ◽  
Machining Accuracy ◽  
Pulse Power Supply ◽  
Micro Ecm ◽  
Ultra Short Pulse ◽  
Pulse On Time

A nanosecond pulse power supply for micro-ECM (Electrochemical Machining) has been developed, and the minimum pulse on-time is 50 ns. After the influence of ultra-short pulse on micro-ECM was analyzed, complementary chopper circuit was presented to avoid waveform distortion, which can achieve higher pulse frequency. A fast protect circuit was designed, and its response time is less than 5μs, which can avoid damaging workpiece and electrical components by switching off machining voltage and step motor as soon as a short circuit was detected. A series of ECM experiments using the power supply have been carried out, and results of test have proved that high frequency, short pulse width power supply helps to achieve better quality surface, higher machining accuracy.

Research on Electrochemical Machining of Deep Small Holes with Positive and Negative Pulse Power

2021 ◽  
Vol 14 ◽  
Author(s):  
Zhaolong Li ◽  
Bingren Cao
Keyword(s):  
Power Supply ◽  
Pulse Width ◽  
Removal Rate ◽  
Electrochemical Machining ◽  
Machining Accuracy ◽  
Negative Pulse ◽  
Mass Removal ◽  
Nickel Based Alloy ◽  
Accuracy And Stability ◽  
Small Holes

Background: High-temperature alloy such as nickel-based alloy has become the main material for core components such as aero engines due to their high strength and good toughness. Therefore, it is of great significance to study how to improve the machining accuracy and stability of electrochemical machining (ECM) of deep small holes on the nickel-based alloy. The instantaneous high-density current during the pulse width of pulse ECM is beneficial to the dissolution of metal workpieces. Many experts and scholars have studied the pulse ECM of deep small holes. Objective: The purpose of this article is to propose and design a Positive And Negative Pulse (PANP) power supply to study the accuracy and stability of ECM of deep small holes on nickel-based alloys. Methods: First of all, an H-bridge composed of four MOSFET switches is designed to achieve PANP output in the main circuit of the power supply. Then, this paper studies the influence of the ratio of positive and negative pulses on short circuits, the influence of the ratio of positive and negative pulses on the mass removal rate, and the influence of the electrolyte concentration and pulse width on the mass removal rate. Finally, according to the obtained optimal parameters, the influence of electrolyte pressure on the average radial overcut of hole depth is analyzed. Results: The experimental results showed that the short-circuit frequency is reduced by more than 50% compared with non-negative pulse power supply; the ratio of positive and negative pulses, pulse width and electrolyte concentration and pressure were optimized by experiments to improve the mass removal rate of the workpiece and the average radial overcut of hole depth. Conclusion: The designed PANP power supply can improve the machining accuracy and stability of ECM of deep small holes on nickel-based alloys.

Research of Pulse Inversion Power Supply of ECM and its Techniques

2009 ◽  
Vol 76-78 ◽  
pp. 630-634 ◽  
Author(s):  
Yong Jun Zhang ◽  
Yong Jun Tang ◽  
Zhong Ning Guo ◽  
Xiao Kang Liu ◽  
Feng Li
Keyword(s):  
Surface Quality ◽  
Power Supply ◽  
High Frequency ◽  
Short Pulse ◽  
Electrochemical Machining ◽  
Machining Accuracy ◽  
Electrochemical Mechanical Polishing ◽  
Pulse Inversion ◽  
Compact Size ◽  
Supply Model

In order to improve machining accuracy and surface quality effectively in ECM (electrochemical machining), a novel pulse inversion power supply has been presented, which has following merits such as high-frequency short pulse, high-power, and compact size. The scheme of full bridge inversion has been selected in this power supply model, and feedback circuit realizes voltage adjusted automatically, and guarantees to stability of voltage. Protect circuit has designed to avoid the problem of workpiece-burn. Finally, a series of electrochemical mechanical polishing tests using the power supply have been carried out, and the results have proved that it helps to achieve well surface quality processed, and improve machining accuracy, and also verify feasibility of its scheme.

A fundamental mode miniature acousto-optically Q-switched Nd:YVO4laser with short pulse width at high repetition rates

2008 ◽  
Vol 5 (4) ◽  
pp. 286-290 ◽  
Author(s):  
Y Wang ◽  
L Huang ◽  
H Zhang ◽  
X Yan ◽  
Q Liu ◽  
...  
Keyword(s):  
Fundamental Mode ◽  
Pulse Width ◽  
Short Pulse ◽  
High Repetition ◽  
Short Pulse Width

Short-pulse-width micromachining of hard materials using DPSS Nd:YAG lasers

2002 ◽  
Author(s):  
Michael Heglin ◽  
Sergei V. Govorkov ◽  
Michael J. Scaggs ◽  
Haris Theoharidis ◽  
T. Schoelzel
Keyword(s):  
Pulse Width ◽  
Short Pulse ◽  
Hard Materials ◽  
Nd:Yag Lasers ◽  
Short Pulse Width

High Repetition Rate Short Pulse Width Nd:YVO4Slab Laser

2008 ◽  
Vol 35 (2) ◽  
pp. 206-210 ◽  
Author(s):  
李小莉 Li Xiaoli ◽  
邵杰 Shao Jie ◽  
臧华国 Zang Huaguo ◽  
陆雨田 Lu Yutian
Keyword(s):  
Repetition Rate ◽  
Pulse Width ◽  
Short Pulse ◽  
High Repetition Rate ◽  
High Repetition ◽  
Short Pulse Width

scholarly journals Pulse Characterization of Optically Triggered SiC Thyristors

2012 ◽  
Vol 717-720 ◽  
pp. 1179-1182 ◽  
Author(s):  
Nicolas Dheilly ◽  
Gontran Pâques ◽  
Sigo Scharnholz ◽  
Dominique Planson
Keyword(s):  
Pulse Width ◽  
Short Pulse ◽  
Fabrication Process ◽  
Device Structure ◽  
Current Pulses ◽  
Short Pulse Width ◽  
Current Densities ◽  
Long Pulse ◽  
Pulse Characterization

This paper deals with the pulse capabilities of 4H-SiC optically triggered thyristors. The device structure and the fabrication process are presented. The results of pulse characterizations are shown. Two types of current pulses were used, a short (pulse width of 10 µs) and a long (pulse width of 650 µs). Peak current densities of 17 kA.cm-2 and 4 kA.cm-2 were attained with short and long pulses respectively. The failures and degradation caused by these experiments are also shown in this paper.

Fabrication of Micro-Structures by Micro-ECM

2009 ◽  
Vol 69-70 ◽  
pp. 229-233
Author(s):  
Ming Huan Wang ◽  
Qiao Fang Zhang ◽  
C.Y. Yao ◽  
Wei Peng
Keyword(s):  
Mathematical Model ◽  
Electrochemical Etching ◽  
Electrochemical Machining ◽  
Pulse Power ◽  
Micro Machining ◽  
Slot Milling ◽  
Micro Ecm ◽  
Micro Holes ◽  
Machining System ◽  
Micro Structures

The machining of materials on microscopic scales is considered to be great importance to a wide variety of fields. Electrochemical Micro-machining (EMM) appears to be promising to machine the micro-structures in future due to the material is dissolved at the unit of ion. This paper is focused on developing a micro electrochemical machining system in which the micro-structures such as micro-cylinder, multiple micro-electrodes, micro-holes and micro-slot were processed. The micro-electrodes were prepared in a precisely controlling the electrochemical etching process. Mathematical model controlling the diameters of electrodes was built up. Furthermore, the obtained micro-electrodes were selected as the cathode tool for micro holes drilling and micro-slot milling using pulse power in Micro-ECM.

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