| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
In EDM, the tool electrode is rotated to flush the debris in the gap and to cool the electrode surface. In RC circuit however, a brush is used to connect the power supply to the tool electrode. Thus, it is difficult to rotate the tool at high speed. With the electrostatic induction feeding method, since a pulse voltage is coupled to the discharge gap by a capacitance existing between the feeding electrode and the rotating spindle, non-contact electrical feeding can be realized. However, since the capacitance is extremely small, the discharge energy per pulse is insufficient to conduct rough machining. To overcome the problem, controlled pulse train method was introduced. High frequency discharge is allowed to continue within a controlled pulse train duration. By utilizing resonance in the circuit, the amplitude of the gap voltage can be amplified higher than the AC power supply. As a result, high-spindle-speed machining became possible under finishing to rough machining conditions.
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