| 摘要 |
PURPOSE:To cut down a pull-out operation of a liner body for vent hole forming by fitting a pipe-like body as bridge on a groove of a plaster core and pouring molten aluminum into the space, which is formed by the core fitting up the pipe-like body and a main mold. CONSTITUTION:The pipe-like body 9 is set across the groove 8 on the surface 7 of the plaster core 1, and recess parts 12, 13 on the side walls 10, 11 of the groove 8 arranged on the surface 7 are formed, and the both ends 9a, 9b of the pipe-like body 9 are laid on the recess parts 12, 13 and is fixed to the recess parts 12, 13 by filling up a filler 14, 15, composing of the plaster, etc. The tire mold made by pouring the molten metal, such as aluminum alloy, etc., into the space, which is formed by the plaster core 1 formed by such a way and the main mold, encloses the pipe-like body 9, which forms the vent hole by long hole thereof, and so the pull-out operation is eliminated. |
