| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding method constituted so as to eliminate the abrasion of a slide surface at a runner branch position, and a mold assembly for an injection molding machine. SOLUTION: The first and second runners 23, 24 and 24 branched from a sprue 21 are provided between the sprue 21 and a cavity 20, and the first gate G1 continued to the first runner 23 and the second gates G2 and G2 continued to the second runners 24 and 24 are provided to the cavity 20. After the flow front of the molten material charged in the cavity 20 from the first gate G1 passes the second gates G2 and G2, the injection of the molten material in the cavity 20 from the second gates G2 and G2 is started and the molten material is successively injected in the cavity from the succeeding gates in this filling timing on and after. A runner changeover member 25 is arranged at the runner branch position so as to be possible to advance and retreat. The runner closed by the advance state of the runner changeover member 25 among a plurality of the runners is opened by allowing the runner changeover member to retreat to change over the filling timing of each of the gates. In the mold release of a molded product, the solidified material remaining at the branch position is discharged. COPYRIGHT: (C)2005,JPO&NCIPI
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