| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing a base isolation plug which can manufacture a base isolation plug having a low air content while suppressing the occurrence of molding failure, and to provide a base isolation plug which has a flat end surface, has a low air content, and is excellent in damping performance and displacement following performance.SOLUTION: A method for manufacturing the base isolation plug includes: a preliminary pressure molding step of pressurizing at least one side of a powder material filled into a mold by using a concave pusher having a pressure surface in which a central part is sunk to a pressure-direction tip end in a direction opposite to the pressure direction; and a final pressure molding step of pressurizing at least the side, pressurized by the concave pusher, of the powder material pressurized in the preliminary pressure molding step by using a flat pusher having a flat surface orthogonal to the pressure direction as a pressure surface. The concave pusher has a ratio of a pusher axial direction length of the pressure surface to a pusher external diameter of less than 0.5. A base isolation plug is manufactured by a manufacturing apparatus suitable for the manufacturing method and by the manufacturing method. |
