Injection molding die null for vehicle bumper

摘要

PURPOSE: To shorten a film gate and suppress the development of poor molding in a mold, in which the film gate is employed. ;CONSTITUTION: In a resin injection mold 2, which has a cavity 5 with the same shaft as a bumper equipped with a center part, which extends to the direction of the width of a car along the front surface or rear surface of a car body, and a side part, which is turned up from both the edges of the center part along the sides of the car body, the film gate 6 of band-like space is provided at the portion corresponding to the center part of the cavity 5. Over the total longitudinal length of the cavity 5, a comparatively thicker wall forming part 5A, a gradually changingly forming part 5B, in which the thickness is gradually changed, and a comparatively thinner wall forming part 5C are provided so as to change the thickness of the cavity 5.;COPYRIGHT: (C)1994,JPO&Japio