| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a base isolation plug which can efficiently manufacture a base isolation plug having a low air content.SOLUTION: A method for manufacturing a base isolation plug includes: a first pressure step of pressurizing at least one side of a powder material filled into a mold by a non-perfect rotational symmetric pusher having a non-perfect rotational symmetric pressure surface; a first re-pressure step of pressurizing the powder material, pressurized in the first pressure step, once or more with the non-perfect rotational symmetric pusher without rotating the non-perfect rotational symmetric pusher and the mold; a second pressure step of pressurizing the powder material, pressurized in the first re-pressure step, with the non-perfect rotational symmetric pusher rotated relative to the mold to change a shape of a pressure receiving surface on the side pressurized with the non-perfect rotational symmetric pusher to a shape different from a shape after the first re-pressure step; and a second re-pressure step of pressurizing the powder material, pressurized in the second pressure step, once or more with the non-perfect rotational symmetric pusher without rotating the non-perfect rotational symmetric pusher and the mold. |
