Method for injection molding of an airbag case

摘要

A method for injection molding of an airbag case comprising a chute channel and a flap, with the chute channel being adapted to receive an airbag. The injection molding is carried out in a mold and comprises the following steps:
arranging in the mold a net,manufacturing the flap and the chute channel by injecting plastic matter into the mold, by overmolding plastic matter on the net by manufacturing a continuity of material between the chute channel and the flap, with a portion of the net being isolated from the injected plastic material, in a closed protective space delimited between a wedge mobile and a first matrix of the mold.;An airbag case in particular manufactures with such a method and dashboard for a vehicle.

主权项

1. A method for injection molding of an airbag case comprising a chute channel delimiting a recess at least partially closed by at least one flap, the chute channel being adapted to receive an airbag, with the injection molding being carried out in a mould comprising at least first and second matrices and a wedge movably mounted with regard to the first matrix,
with the method comprising the following steps:
arranging in the mould, a net comprising a first portion, a second portion and a third portion, with the third portion being located between the first and the second portion, with the first, third and second portions forming a continuous unit, the third portion of the net forming a loop and comprising a first connecting portion between the first portion and the third portion of the net, and a second connecting portion between the third portion and the second portion of the net,manufacturing the flap and the chute channel by injecting plastic material into the mould, by overmolding plastic material respectively on the second portion of the net and on the first portion of the net, with a continuity of material between the chute channel and the flap, with the third portion of the net then being isolated from the injected plastic material, in a closed protective space delimited between the wedge movably mounted and the first matrix, wherein the wedge is movable between a protective position, wherein the wedge and the first matrix close the protective space, and an open position, wherein the wedge and the first matrix do not close the protective space, and wherein the displacement of the wedge from its open position to its protective position closes the protective space by pinching the first connecting portion and the second connecting portion between the wedge and the first matrix.