| 摘要 |
PURPOSE:To obtain a metal disc of high quality subjected to two sides grinding or polishing finish without wear, defect and dirt on its peripheral edge by grinding the disc in the state of wrapping at least a part which makes contact with metal disc by a ring which consists of soft material. CONSTITUTION:Carriers 13 which revolve while making autorotation are installed between surface plates 16,17 facing each other, metal disc 15 to be ground or polishing, are loaded in holes 14 of the carriers 13, grinding material or polishing materials 18,19 attached to the surface plates 6,17 are applied to both sides of the discs and the metal discs 15 are ground or polished. In this case, a thin ring 20 whose thickness is smaller than the thickness of the metal disc 15 and of which at least a part, making contacting with the metal disc 15, consists of material softer than that of the metal disc 15, is interposed between inside surface of each 14 of carriers 13 and outside surface of metal disc 15. Thereby any wear, defect and dirt can not be generated in the periphery of the metal disc 15. |
