| 摘要 |
<p>PURPOSE:To eliminate the wastefulness of material and to reduce manufacturing cost by pressing a rod-shape piece in the direction crossing the layers of the rod-shaped piece at a right angle not only to reduce the wall thickness thereof in such a state that the layered structure of the rod-shaped piece is held but also to adjust the length thereof. CONSTITUTION:A rod-shaped piece 14 cut into predetermined length is prepared. This rod-shaped piece 14 has such a columnar shape that a center part 15, an intermediate part 16 and an outer peripheral part 17 are formed in a concentric circular state. The rod-shaped piece 14 is immediately laid on the lower mold 22 of a press mold 21 to be pressed by an upper mold 23 before cooled and solidified. The molded thin-wall plate body is composed of a five layer structure consisting of the center layer 25 formed from the center part 15 of the rod-shaped body 14, the intermediate layers 26, 26 formed from the intermediate part 16 and the outer layers 27, 27 formed from the outer peripheral part 17. The thin-wall plate body 24 thus molded is subjected to vacuum molding. The thin-wall plate body 24 is sucked in a vacuum mold 34 to be formed into a desired product shape.</p> |
