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Study on Methords for Detecting Micro Edm State

Author: FanDaoWei
Tutor: ChiGuanXin
School: Harbin Institute of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Micro-EDM Servo control Discharge status detection
CLC: TG661
Type: Master's thesis
Year: 2010
Downloads: 139
Quote: 0
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Abstract


With the development of MEMS technology , and the pursuit of product miniaturization , micro-EDM technology more and more attention of researchers , and is widely used in the aerospace , medical , mold , microelectronic devices , biotechnology , micro- sensors and micro - electrical manufacturing . Accurate , stable and efficient micro-EDM system has been a goal of researchers . Spark discharge state detection system is a key part of the machine tool servo is stable machining the necessary conditions of the EDM machine , developed for fine EDM discharge detection system has an important significance . This paper first introduces the micro-EDM technology at home and abroad and discharge status detection status quo, and elaborated on the principles of traditional discharge state detection . Laboratory five-axis micro-EDM machine to study the discharge characteristics of the power , clear the difficulty should be resolved in the new discharge condition monitoring system developed : to overcome the micro-EDM discharge voltage irregularity . The system 's overall design concept : to distinguish between current discharge status , high level representatives between the open not discharge , low to indicate discharge voltage output high and low voltage comparator . The RC low- pass filter processing the output of the voltage comparator , reflecting the stability of the processing state in the period of time and feedback to the machine tool servo system . According to this line of thought , we completed the new discharge status detection system hardware and software design , data processing and transmission of the late PIC microcontroller , and verify the stability of the entire system accuracy. Correct operation of the system depends on the comparator threshold voltage and the RC filter parameters set in this article through a large number of experiments and actual processing waveform analysis to complete the selection of parameter values ??under different processing conditions , experiments show that the new discharge detection system can accurately reflecting the state of the machining . Actual processing verification application discharge detection system designed in this paper show that the new detection system , the machining efficiency is greatly enhanced through the hole machining trials ; through micro -axis machining experiments show that the new detection system and machine tool servo with stable , able to easily machined shaft diameter of about 20 microns .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Special machine tools and processing > Electric machines and their processing
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