| 摘要 |
PURPOSE:To prevent a surface to be machined from being subjected to defects such as scratching, white-marking and the like by rapidly retracting an electrode and rotary tool from a disc in the direction perpendicular to the surface of a workpiece after completion of polishing of the disc, and by cutting off an applied voltage in a short time. CONSTITUTION:An aluminum disc 1 is supported in a vertical attitude by rollers 2 located at three positions along the periphery of the disc, and is rotated while it is electrically connected to one pole of a power source. Electrode and rotary tools 3 each having a resilient unwoven fabric surface as a polishing pad are attached to the forward ends of splined shafts 4, being opposed to both surfaces of the disc 1, and are rotatably supported on spindle beds 5. The electrode and rotary tool 3 which is connected to and energized by the other pole of the power source is pressed against a surface to be machined of the disc 1 while machining liquid and abrasive are fed to the surface to be machined of the disc, and therefore, electrolytic combined mirrored-surface polishing is carried out. The retraction of the tool 3 from the disc is smoothly made at a fast retracting speed since a ball-and-screw jack is used for feeding the tool. Further, the voltage is cut-off in a short time by means of a circuit breaker.
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