| 摘要 |
PURPOSE:To obtain the neat periphery, which is not corrugated, of an opening in an expansion molded shape by positioning a skin material along a swell-out section formed to an expansion die by a projection formed to a core material and expanding an expanded material. CONSTITUTION:Swell-out sections 5a, 5b are formed to the inner surface of a recessed die 5, on which a skin material 10 must be fast stuck, in an expansion die B while being made to correspond to sections to which openings 11, 12 are to be shaped. Positioning projections 8a, 8b surrounding the swell-out sections 5a, 5b are formed to a core material 8 in a projecting manner. The swell-out sections 5a, 5b and the positioning projections 8a, 8b have dimensional relationship of which they have clearances in size approximately the same as the thickness of the skin material 10 under the state in which the expansion die B is mold-clamped. When the core material 8, an expanded material 9 and the skin material 10 are set to a cavity 7 in the expansion die B by using such a core material 8 and the expansion die B, and mold-clamped and the expanded material is expanded, the expanded material sufficiently spreads to the skin materials 10 in the opening sections even when the blowing pressure of sections corresponding to the openings 11, 12 is small. |
