| 摘要 |
PROBLEM TO BE SOLVED: To provide a molding method which can easily mold a centrifugal fan having twisted blades in a shape having an undercut and a molding mold for the method. SOLUTION: In the molding mold for the centrifugal fan, the centrifugal fan having a plurality of the twisted blades integrally is held in its central axis direction between the peripheral parts of one surface of a cone and molded, and after the molding, the molding mold for the centrifugal fan is extracted to one surface side and the other surface side of the cone in relation to the centrifugal fan. The molding mold on one surface side of the cone is divided into the first mold for molding the non-undercut part of each twisted blade and the second mold for molding the undercut part of each twisted blade by a split surface which makes a surface parallel to the central axis approximately along the form of each twisted blade. At least the second mold is constituted to be able to rotate around the central axis, and the second mold is made to be extracted without interfering with the molded twisted blades. |
