Molding device for molding rotator and method for molding same

摘要

A molding device is provided for molding a blower fan that has a center member (5) embedded in a center portion of the fan. The molding device comprises a pair of molding dies (40,41) which define therebetween a shaped cavity when properly coupled; and an insert die (10) fixed to one of the pair of molding dies in such a manner that at least a part of the insert die (10) is exposed to a shaped cavity that is produced when the molding dies are coupled. The insert die (10) includes a base block (11) secured to one of the pair of molding dies; a cylindrical holding bore (21) defined by the base block; a plurality of cylindrical eccentric members (25) having eccentric through bores (27) whose eccentric degrees are different from one another, each eccentric member (25) being sized to be intimately received in the cylindrical holding bore (21); a positioning structure that establishes an angular positioning of selected one of the cylindrical eccentric members (25) in the cylindrical holding bore relative to the base block; a center pin (30) adapted to carry thereon the center member (5) for placing the center member (5) in the shaped cavity when the paired molding dies are coupled, the center pin (30) having one end portion intimately received in the eccentric through bore (27) of the cylindrical eccentric member (25) held in the cylindrical holding bore; and a fixing structure that fixes the center pin to the base block.