| 摘要 |
PURPOSE:To prevent sink mark on the surface from developing by a method wherein an insert part provided with an extended part is arranged within the product part space of a mold so as to nearly uniformly set the thickness of a cavity part, which is partitioned by the wall surface of the product part space, the outer peripheral surface of the extended part and the outer peripheral surface of the insert part. CONSTITUTION:The constitutional part 1 on one hand or an insert part, which includes an extended part 112 made in advance, is arranged in the part of the product part space 6 of a mold 5 consisting of a core block 3 and a cavity block 4 so as to set the thickness of a cavity part 7 is nearly uniform, which is partitioned by the wall surface of the product part space 6, the outer peripheral surface of the extended part 11 and the outer peripheral surface of the extended part 11 and the outer peripheral surface of the constitutional part 1 on one hand in other words the distance between the wall surface of the product part space 6 and the outer peripheral surface of the extended part 11 is set nearly uniform. After that, synthetic resin molding stock for the constitutional part 2 on the other hand is poured from the gate 8 of the cavity block 4 in said cavity part 7 and solidified. When the constitutional part 2 on the other hand solidifies under the above-mentioned state, the surface and the interior of the part 2 solidify at about the same speed. |
