| 摘要 |
PURPOSE:To prevent the partial deformation caused by molding shrinkage of an instrument panel of a car subjected to injection molding. CONSTITUTION:A resin instrument panel 1 having an undercut structure having an air blowoff port part 1a which has attaching holes 2 for supporting an external part formed to the upper and lower wall surfaces thereof in a piercing state provided to the end part thereof is produced by injection molding. The blowoff port mold forming the inner surface of the air blowoff port part 1a is equipped with a pair of upper and lower extrusion molds 4 and the extrusion guide allowing both molds to approach and separate in an up-and-down direction. Projections 4a forming the attaching holes 2 are provided to the extrusion molds 4 and protruding parts 4b are integrally provided thereto in the panel molding shrinkage direction in the vicinity of the projections 4a. The molding shrinkage force F of the instrument panel generated when the instrument panel subjected to injection molding is extruded by the extrusion molds 4 to be demolded is dispersed by the engagement of the projections 4a and the attaching holes 2 and the engagement of the protruding parts 4b and recessed parts 7 to prevent the deformation of the attaching holes 2. |
