| 摘要 |
PURPOSE:To enable to align a top and a bottom forces and at the same time to control to keep the section of the slant surface of a rotating disc uniform by a structure wherein a thickness setting ring with specified expansion coefficient is made of carbon fiber reinforced plastics in order to interpose between the forces. CONSTITUTION:A thickness setting ring 8 is made of carbon fiber reinforced plastics (CFRP). The thermal expansion coefficient of CFRP is set so that the gaps made between the thickness setting ring 8 and a top force 4 and a bottom force 5 are large at room temperature and zero or less at the heated state under heat and pressure. Consequently, the setting of a molding tool is easy at room temperature, at which material 11 is filled in the molding tool. On the other hand, at the heated state, the thickness setting ring 8 tightly contacts with the top force 4 and with the bottom force 5, resulting in aligning both the forces 4 and 5 and at the same time flowing no material outside the molding tool. Further, at the cooled-down state to remove from the molding tool, the gaps are made to be larger again, resulting in facilitating the removal from the molding tool.
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