| 摘要 |
PROBLEM TO BE SOLVED: To provide a fabrication method to easily modifying an excessively curved sheet, to a properly curved shape with high productivity. SOLUTION: In this fabrication method of the curved sheet, first, an excessively curved sheet 1 composed mainly of a thermoplastic resin is piled to the thickness of 10 to 40 mm, then is sandwiched between an upper and a lower metallic flat sheet, and heated up to a specified temperature under a load and kept as it is. Next, another excessively curved sheet composed mainly of a thermoplastic resin is further piled on the former sheet 1 to the thickness of 10 to 40 mm, then is sandwiched between the metallic flat sheets and is heated to a specified temperature under a load and kept as it is. These procedures are repeated and later, the excessively curved sheets composed mainly of the thermoplastic resin, thus repeatedly piled, are kept at an almost specified temperature and annealed all at once. After that, these piled curved sheets are cooled naturally. COPYRIGHT: (C)2009,JPO&INPIT |
