| 摘要 |
PURPOSE:To make it possible to set the depth of cut larger and to narrow the interval between cuts and consequently obtain a small-sized bellows having large amount of elongation and contraction by a method wherein a male mold, which is prepared by fittingly mounting a plurality of thin annular sheets for forming the inner peripheral part of a bellows along the axial direction, is clamped in radially split female molds having thin annular plates together and, after that, resin powder is filled in bellows molding cavity, which is formed between the female molds and the male mold and produced. CONSTITUTION:Respective annular sheets 25 are fittingly mounted onto the core 22b of a male mold 22 by stepped parts 22c in order from the base part side of the core 22b. After that, the male mold 22, onto the core 22b of which a plurality of the annular sheets 25 are mounted, is clamped in a female mold 23 so as to fill resin powder consisting of polytetrafluoroethylene in a cavity 24, which is formed between the male mold 22 and the female mold 23. Next, by melting the resin powder through heating, a shape of bellows plug is produced. After that, the male mold 22 is separated from the female molds 22. In this case, the core 22b is pulled out of the annular sheets 25, leaving the annular sheets 25 in the resin formed item. After that, by splitting the female molds 2, the bellows plug is released. |
