| 摘要 |
PURPOSE:To enable preform at a uniform density in forming a circular cylindrical tablet of a powder resin, by exerting pressure on the side face of the circular cylinder. CONSTITUTION:A hole having a rectangular section is opened in a die 2, and a powder resin 3 is put there and is compressed in a vertical direction (arrows B, B') by means of a pair of punches 1a, 1b of which the half of the side faces of the circular cylinder is sunk. Then the tablet of a large weight can be removed as far as the dies have the stroke equal to the diameter of the circular cylinder and therefore one-piece molding is made possible and the density distribution in the axial direction is made uniform. If resin molding is accomplished with this tablet, the generation of the voids in the resin molding occurring in the air existing in the part where the density is nonuniform and small is reduced. |
