| 摘要 |
PURPOSE:To make a fine hole diameter accurately moldable to an axial center of a small piece, by rotating the small piece in a state that a fine wire is inserted into the through fine hole diameter installed in the presintering small piece of ceramic, while adding pressing force to this fine hole diameter from the outside with dead load of the small piece. CONSTITUTION:A fine wire 11 is inserted into a fine hole diameter 12 piercing through a presintering ceramic small piece 1. This small piece 1 is mounted on a pair of rollers 2 and 3, and concentric directional turning motion is repeated whereby rolling pressure force is added to a part of the fine hole diameter 12 being already pierced through from the outside, and the fine hole diameter 12 is molded to an axial center of the small piece 1 by degrees in a yet more accurate manner. |
