| 摘要 |
PURPOSE:To form a three-dimensional form surface of hard-cut metals into mirror-finishing form by setting current density at the half period to less than 2/3 of that at the latter period, in case of a method for finishing as removing an electrolytic product formed between a workpiece and a tool electrode. CONSTITUTION:At the first period of finishing work, a pulse current of 5A/ cm<2>-20A/cm<2> in current density is fed to a gap between a workpiece 2 and an electrode 4 from a power unit 8 by a control signal out of a working condition control part 10, thus the workpiece is machined. And, after raw material is eluted, an electrolytic product is removed together with dielectric fluid 41 by operation of a solenoid valve 50. Next, the fresh dielectric fluid 41 is fill up, a series of processes is repeated by a signal of a controller 12. Afterward, when machining depth accumulated value becomes within the specified difference to the setting value, it is changed over to the pulse current of more than about 30A/cm<2> in current density. With this constitution, such a three-dimensional metal curved surface that showed a mirror-like gloss of highly accurate and fine surface roughness is securable in a short time.
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