| Summary: | 碩士 === 崑山科技大學 === 機械工程研究所 === 96 === In this study, we use HY-80 workpiece to find characteristics, by 4D CNC EDM, pulse count current(Ip), pulse-on duration(TON), pulse-off duration (TOFF), and gap voltage(Vg) will be selected the optimal combination of parameters was obtained. And then confirmation experiment was done by the optimal combination of parameters. On the other hand, the single-factor experimental method was used to investigate the relation of EDM conditions and machining characteristics.
By the analysis of the experiment, the single-factor experimental method was used to investigate the relation of EDM conditions and machining characteristics, and the surface characteristic of HY-80 high tensile steel after EDM.
The experimental result discharges when the time of stopping is set as the regular parameter, discharge electric current is rise to 25A to transfer by stage from 3A, consume discharge electric current increase at the same time. As discharge in the electric current to stop regularly in time, and increase between 10～20μs, the material is moved except that the rate also increases relatively, but discharge in duration when being greater than 20μs, the material is moved except value after the rate drops gradually, discharge duration at lying between 10～100μs, long electrode consuming rate few time have separately, the change of consuming rate of the electrode has trend slowed down when being greater than 100μs. When it is regular parameters that the experiment establishes and discharges the electric current, it’s stop time increase to discharge, unit relative to reduce to discharge number of times, so processing speed and the consuming rate of electrode, also with reduce naturally.
By experimental analysis, relation of EDM parameter terms can be learnt with phase corresponding , surface of roughness to change, increase pulse count current, the roughness of surface also increases ; And change pulse count current or pulse-off duration to increase, surface roughness appear inverse ratio trend their instead.
And to confer the material surface characteristic after machining by the difference machining parameters, and observe meta-micro-hole electrical discharge with scanning electron microscope. The observation items have the conformation of electrical-discharge increase 20A, distributive thickness, diameter and depth of the crater, condition of amass tailing, cleavage conformation of surface and distributive thickness.
In study, same experimental EDM parameter researching for main-side and other side, find out method was used to investigate the relation of EDM conditions and machining characteristics, and infester balloter didn’t flat on main-side workpiece, potation for different method faster increase hot-cold change in relation of EDM conditions.
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