| 摘要 |
PURPOSE:To manufacture even a complicated molding simply and for a short time by a method wherein a resin sheet heated and softened undergoes a male die vacuum molding, a partial liner of a male die retreated with a resin molding to be fitted into a female die and then, the partial liner advanced to be fitted into the undercut part of a female die for die matching before a female vacuum molding. CONSTITUTION:A resin sheet 6 employing a hard vinyl chloride sheet (1.0mm. thick) is heated soft up to 170-180 deg.C and undergoes a male die vacuum molding with an aluminum male 9 for vacuum molding at -500mm.Hg. In this case, a partial liner 10 is matched with an undercut section U and fixed to perform the molding. With the molding M thus obtained by the male die vacuum molding on the male die 9, the partial liner 10 is retreated with a driving member 11 and fitted into a female die 12 (Ni electroformed) formed in the same shape to match the male die 9. After the complete die matching, a female die vacuum molding is done with the female die 12 set under -700mm.Hg atmosphere. |
