| 摘要 |
PURPOSE:To have mirror-face finishing with extraordinary good flatness by grinding the surface of a thin metal sheet twice on each side in the same grinding condition approximately. CONSTITUTION:A grinding plate 1 is rotated round the X-X' axis. A ring- shaped case 2 is rotated, in which a thin metal disc 3 is adhered to the undersur face of a retaining glass plate 4 using wax and placed in contact with the grinding plate 1. The space in the case 2 above the retaining plate 4 is filled with a resilient material 5, and thereon a weight 6 is put to press the metal sheet 3 with appropriate pressure. In this condition, the oversurface of grinding plate 1 is cated with abrasive grains, and the grinding plate 1 is rotated to grind the undersurface of the metal sheet. Thereafter the retaining plate 4 is heated to melt the wax, and the metal sheet 3 is taken out and turned over, and now the oversurface of the metal sheet 3 shall be ground in the same man ner as above with the grinding surface facing down. This enables mirror-face finishing with extraordinary good flatness. |
