| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an extension in which occurrence places of a weld line can be reduced even if a molded product (an extension) is thin and a gate cut process for separating the molded product from a side gate is not necessary in a post-process after molding.SOLUTION: In an injection molding die of an extension having a low-beam opening made of a circular through-hole in which emitting light from a projector type light source is provided in the central part, a disk shape runner 52 is installed in a region where a circular through-hole of a cavity 50 of the molding die is molded, and a ring shape gate 51 is installed at a tip of the runner 52. Shock pressure is applied to the central part of the runner of the molded product which is taken out from the molding die after injection molding and the runner and the gate are eliminated as a lot and instantaneously to secure the circular through-hole. |
