| Abstract |
In this paper, by the characteristics of the electro-rheological (ER) fluid, and propose an innovative large area polishing technique by combining with ER fluid and CNC machining Center. The characteristics of innovative large area polishing technique do not need very high-precision plane datum and the two planes can be processed at the same time. Firstly, a ER viscous force measurement system was designed in this paper, in order to investigate the ER effect in different parameters. The abrasive grains were added to the ER fluid, and then uniformly mixed into the ER polishing slurry. The CNC machining center is used to a platform. The spindle and bed in the machining center were set each holding a large area flat conductive workpiece, and placed the ER polishing slurry between the up and down plane of workpiece and controlled the gape between of the upper and lower plane of workpiece to maintain a proper spacing. A high-voltage generator was used to supply the appropriate voltage, the workpiece on spindle was set an anode and the workpiece on the bed was set a cathode. Let the spindle rotational motion and the planetary motion, so that both the upper and lower plane can be grinding and polishing under the environment of the ER polishing slurry, and gradually form planes. After experiments, it can be found that the slurry composition, abrasive grains size, spindle speed, moving path, feed rate have significant impact on the processing capacity of large area polishing technique. |
