A Research on a Medium-Speed Wire Cut Electrical Discharge Machining

2014 ◽  
Vol 711 ◽  
pp. 53-56
Author(s):  
Chang Zhong Wu ◽  
Shuai Shuai Lu
Keyword(s):  
High Frequency ◽  
Electrical Discharge ◽  
Pulse Width ◽  
Electrical Discharge Machining ◽  
Single Chip ◽  
Feed System ◽  
Medium Speed ◽  
Control Section ◽  
Frequency Pulse

Based on the characteristics of the machine, wire walking agencies, table feed system and the circuit control section has been studied in combination with all kinds of WEDM. The machine use PLC to control the campaign of wire walking agencies, using the trip switch to control motor reversing, controlling the movement of the machine table through MCS-51 series single-chip and using high-frequency pulse-way power offers a range of different pulse width of the rectangle for WEDM .In this way ,it simplifies the overall structure of the machine and improves efficiency of the feed system and cutting performances.

Software Design of Pulse Generator Based on Single-Chip Computer and CPLD

2012 ◽  
Vol 201-202 ◽  
pp. 218-221
Author(s):  
Ji Gao ◽  
Xiao Fang Ma ◽  
Qing Yang Liu
Keyword(s):  
Electrical Discharge ◽  
Pulse Generator ◽  
Low Voltage ◽  
Electrical Discharge Machining ◽  
Pulse Signal ◽  
Pulse Power ◽  
Technical Requirement ◽  
Signal Source ◽  
Single Chip ◽  
Single Chip Computer

The purpose of this article is to study and devise pulse signal source of electrical discharge machining(EDM). The technology of EDM is the necessary key technology in various processing methods. Electrical discharge machining pulse power aims to convert the industrial frequency alternating current into certain frequencies pulse current to supply energy for electrode discharging to removal metal. Pulse power generator, controlled by an embedded MCU, can produce high voltage or low voltage discharge pulse waveform. After the research on characteristics and principles of many pulse powers, a novel, intelligent, high frequency pulse power supply with adjustable amplitude, frequency and duty is developed which has a favorable foreground in engineering application and a great theoretical significance. This paper is to realize the design of EDM pulse signal source based on the method of combining single-chip computer and complex programmable logic devices (CPLD), to satisfy the technical requirement of periodic variable and machining efficiency improving.

Study on Modeling and Simulation of Wire Vibration in WEDM

2012 ◽  
Vol 472-475 ◽  
pp. 2013-2017
Author(s):  
Chao Jiang Li ◽  
Yong Feng Guo ◽  
Ji Cheng Bai ◽  
Ze Sheng Lu ◽  
Chuan Chen
Keyword(s):  
Electrical Discharge ◽  
Pulse Width ◽  
Metal Cutting ◽  
Electrical Discharge Machining ◽  
Orthogonal Design ◽  
Pulse Interval ◽  
Machining Accuracy ◽  
Wire Tension ◽  
Wire Vibration ◽  
The Wire

The wire electrical discharge machining (WEDM) has been widely used in the field of metal cutting, mold industry, aerospace and so on. However, in the discharge machining, it is very important to restrain the wire-tool vibration for the improvement of machining accuracy. In this paper, it is created a model of the wire vibration with double-ended fixed, established the differential equation of vibration, and derived its full theoretical solution to analysis the vibration factors. Simulations of the wire vibration with ANSYS Transient dynamics analysis were given. An orthogonal design of the wire vibration using L9 orthogonal table was made, and the experiment found that minimize the servo voltage, reduce the pulse width, and select the appropriate wire tension and pulse interval, which can reduce the wire vibration.

Study on the Experimental of the Electrical Discharge Machining Titanium Alloy on Gas Dielectric

2013 ◽  
Vol 644 ◽  
pp. 171-174 ◽  
Author(s):  
Shuo Guo Zhao ◽  
Xiao Min Yao ◽  
Rui Li
Keyword(s):  
Titanium Alloy ◽  
Electrical Discharge ◽  
Pulse Width ◽  
Electrical Discharge Machining ◽  
Supply Voltage ◽  
Orthogonal Experiment ◽  
Great Influence ◽  
Gas Processing ◽  
Low Supply Voltage ◽  
Processing Properties

In order to know the processing properties of the Electrical Discharge Machining titanium alloy on gas dielectric. Firstly, this paper does comparing experiment of EDM in gas processing titanium alloy. The results indicate that electrode dissipation is low with equifrequence square wave, positive polarity and low supply voltage to machining titanium alloy when pulse width is narrow. Secondly, this paper has done the orthogonal experiment and the variance analysis of experimental results, Its result shows that pulse width and peak current have a great influence on the machining efficiency .

The Design of 25KV High-Frequency High-Voltage Power Supply

2014 ◽  
Vol 912-914 ◽  
pp. 927-930
Author(s):  
Qiang Jiang
Keyword(s):  
Power Supply ◽  
High Frequency ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
High Voltage Power Supply ◽  
Switch Power Supply ◽  
Switch Power ◽  
Inverter Topology

In this paper, a HV and HF switch power supply was designed, which was controlled through a single chip microcomputer, also the MOSFET was used as the switch power tube. The PWM (pulse width modulation) technique and half-bridge inverter topology have been used to invert AC into the DC that can be adjust from 0V~25KV and the operating frequency is 35KHz, Through the simulation with the Saber software and practical use, the feasibility of the scheme and the correctness of the design have been verified.

Study on EDM Machining Technics of Polycrystalline Diamond Cutting Tool and PCD Cutting Tool’s Life

2011 ◽  
Vol 268-270 ◽  
pp. 309-315 ◽  
Author(s):  
Yun Hai Jia ◽  
Jian Gang Li ◽  
Xue Jun Lu
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge ◽  
Pulse Width ◽  
Cutting Tool ◽  
Electrical Discharge Machining ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Machining Parameter ◽  
Diamond Cutting Tool ◽  
The Relationship

The Samples of Polycrystalline Diamond (PCD) Cutting Tool Were Machined by Adjusting the Main Parameters of Electrical Discharge Machining (EDM). after the Machining, the Phases Were Analyzed by X-Ray Diffraction Analyzer and the Surface Layer Microstructure Were Observed by Scanning Electronic Microscope. the Fundamental Component of Machined PCD Cutting Tool Affected Layer Was Obtained and the Reason of Bring Affected Layer Was Analyzed. the Relationship Curves between Pulse Width, Working Electric Current and Depth Affected Layer, Surface Roughness Were Summarized. the Relationship between PCD Cutting Tools that Was Machined by EDM and Cutting Tool Flank Width, Workpiece Surface Roughness Were Analyed.The Results Showed that to Adjust Electical Discharge Machining Parameter, such as Pulse Width and Machining Electric Currents, Can Reduce the Depth of Affect Layer and Extend the Service Life of PCD Cutting Tool.These Researches Provide Valuable Test Reference for Drawing up Electrical Discharge Machining Technics of PCD Cutting Tool and Cutting Tool’s Life.

scholarly journals Variable-Frequency Pulse Width Modulation Circuits for Resonant Wireless Power Transfer

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3656
Author(s):  
Li-Chuan Tang ◽  
Shyr-Long Jeng ◽  
Edward-Yi Chang ◽  
Wei-Hua Chieng
Keyword(s):  
Duty Cycle ◽  
High Frequency ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Wireless Power Transfer ◽  
Switching Frequency ◽  
Variable Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Frequency Pulse

In this paper, we develop a variable-frequency pulse width modulation (VFPWM) circuit for input control of 6.78-MHz resonant wireless power transfer (WPT) systems. The zero-voltage switching control relies on the adjustments of both duty cycle and switching frequency for the class-E amplifier used in the WPT as the power transmission unit. High-frequency pulse wave modulation integrated circuits exist, but some have insufficiently high frequency or unfavorable resolution for duty cycle tuning. The novelty of this work is the VFPWM circuit design that we put together. A voltage-controlled oscillator (VCO) of radio frequency and capacitor-coupled difference amplifiers are used to simultaneously perform the frequency and duty cycle tuning required in resonant WPT applications. Different circuit topologies of VFPWM are compared analytically and numerically. The most favorable circuit topology, enabling independent control of the frequency and duty cycle, is employed in experiments. The experimental results demonstrate the validity of the novel VFPWM, which is capable of operating at 6.78 MHz and has a duty ratio adjustable from 20% to 45% of the range applicable in the resonant WPT applications.

Static DC to sinusoidal AC inverter using techniques of high-frequency pulse-width modulation

1967 ◽  
Vol 3 (3) ◽  
pp. 250-256 ◽  
Author(s):  
Yuan Yu ◽  
T. Wilson ◽  
I. Babaa ◽  
S. Feng ◽  
E. Moore
Keyword(s):  
High Frequency ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Frequency Pulse
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