TH28518A - The process for manufacturing synthetic resin bumpers for automobiles. - Google Patents

Abstract

Inject the outer layer of building material into the void in the mold, then inject the core building material, allowing the core material to flow into the outer layer of building material exiting that void, and allowing both materials to flow within that void. This void contains the main area for forming the main bumper section, and the side areas for forming the side bumper sections. The relationship d1 > d2 is shown between the distance d1, which determines the bumper thickness of the first section for forming the top of the main bumper, and the distance d2, which determines the bumper thickness of the second section for forming the bottom of the main bumper. The relationship d3 > d1 is shown between the distance d3, which determines the bumper thickness of the side area, and the distance d1. Therefore, in the main and side areas, the time required for the filling of the outer layer of building material to be complete is considered equal for both.

Claims (3)

1. The process for manufacturing a resin-based, sandwich-structured bumper for automobiles, consisting of a core (2) and an outer layer (3) that encloses the core, consists of: the first step of injecting the outer layer (M1) forming material into the bumper forming cavity (17) through gates (16) in a metal mold. The bumper forming cavity includes the main area (171) for the formation of the main bumper section (41) which extends laterally from the center of the vehicle, and a pair of lateral areas (172) for the formation of a pair of bumper sides (42) that are continuous with the opposite ends of the main bumper section. The main area consists of the first (17a) for the formation of the upper (4a) portion of the main bumper section, and the second (17b) for the formation of the lower (4b) portion of the main bumper section. The metal mold is then used. The relationships d3 > d1 and d3 > d2 are shown between the distance d1 that defines the bumper thickness of the first section, the distance d2 that defines the bumper thickness of the second section, and the distance d3 that defines the bumper thickness of each side area, and the first door opens inward; and the second step of core-forming material injection (M2) to allow the core-forming material to flow into the outer-forming material present in the first door and the gap, and to allow the outer and core-forming material to flow into the gap. 2. The procedure under claim 1, which has a relationship d1 > d2, is shown between the distance d1 of the first part mentioned and the distance d2 of the second part mentioned. 3. The procedure under claim 1 or 2 which has a relationship Z1 > Z2 shown between the cross-sectional factor Z1 of the aforementioned main bumper section (41) and the cross-sectional factor Z2 of each side of the aforementioned bumper (42).