| 摘要 |
PURPOSE:To facilitate the charging operation by a method wherein molding material is charged in a cavity under the state that a side core mold is retreated from the cavity and then pressurized and finally the side core mold is advanced in the cavity. CONSTITUTION:First in a molding tool consisting of a cavity mold 1, a core mold 2 and a side core mold 3, mold material 4 is charged under the state that the side core mold 3 is retreated from a cavity. Secondly, the predetermined primary pressure and time, which are necessary for softening of the material at its early stage, are applied and, after that, the pressure is released. Thirdly, under the above-mentioned state, the side core mold 3 in its retreated position is advanced so as to push aside the softened molding material. Fourthly, after the advancement of the side core mold 3 in the cavity, the pressure is also applied so as to hold the predetermined pressure and time. Because the side core mold is in its retreated position during the charging of the molding material, the charging of the material is easy. Furthermore, because the side core mold is advanced in the cavity through the softened molding material, little breakdown develops in the molds.
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