Airbag covering provided with a specified rupture line and method for the production thereof
First Claim
1. Airbag cover which is integrated in shaped flat material and whose contour is defined by a predetermined breaking line (S) that has been introduced into the flat material in a recessed manner, wherein the flat material has, at least in the area of the predetermined breaking line (S), a barrier layer (3) made from a material which, by reason of its properties, has greater resistance to removal of material by laser action than the rest of the flat material, and wherein the recesses in the flat material extend along the predetermined breaking line (S) essentially up to the barrier layer (3).
2 Assignments
0 Petitions
Accused Products
Abstract
An airbag cover is defined by a predetermined breaking line which is introduced into a shaped flat material in a recessed manner. The recesses are achieved by removing material by means of laser radiation. According to the invention, the flat material is provided with a barrier layer. The barrier layer, by reason of its material properties, has greater resistance to removal of material by laser action than the material of the rest of the flat material. The recesses made by removing material extend along the predetermined breaking line in the flat material up to the barrier layer. The barrier layer makes it possible to produce a predetermined breaking line by means of laser machining which allows an exact residual wall thickness of the airbag cover in the area of the predetermined breaking line, so that the tearing strength can be adjusted very accurately, which is critically important for a reliable deployment of an airbag. Further, a method for the efficient production of an airbag cover of this type is indicated.
22 Citations
20 Claims
- 1. Airbag cover which is integrated in shaped flat material and whose contour is defined by a predetermined breaking line (S) that has been introduced into the flat material in a recessed manner, wherein the flat material has, at least in the area of the predetermined breaking line (S), a barrier layer (3) made from a material which, by reason of its properties, has greater resistance to removal of material by laser action than the rest of the flat material, and wherein the recesses in the flat material extend along the predetermined breaking line (S) essentially up to the barrier layer (3).
- 7. Method for producing an airbag cover which is integrated in shaped flat material and whose contour is defined by a predetermined breaking line (S) that has been introduced into the depth of the flat material, characterized in that a flat material is produced initially which has, at least in the area in which the predetermined breaking line (S) is to be introduced, a barrier layer (3) comprising a material which, by reason of its properties, has a greater resistance to removal of material by laser action than the rest of the flat material, and the predetermined breaking line (S) is subsequently introduced in that recesses are made in the flat material by means of laser radiation at a plurality of adjacent locations, wherein the intensity of the laser radiation is selected in such a way in relation to the properties of the barrier layer (3) and the rest of the flat material that only the flat material, but not the material of the barrier layer (3), is removed at each of these locations.
Specification