KR100559517B1 - Method for forming of passenger airbag door for automobile - Google Patents

Abstract

The present invention relates to a method for forming a passenger seat airbag door for an automobile, and at the same time forming the airbag mounting seat surface, the core material that functions as an airbag door, made of conventional PC + ABC resin for cost and weight reduction Except for the material, instead of changing to PP (polypropylene) series material, and complementing the mechanical properties, thereby fixing the reinforcing frame to the core part by vibration welding method, compared to the existing airbag door The present invention relates to a method for forming a passenger seat airbag door for automobiles which can secure a mechanical performance equivalent to that of a conventional PC + ABC material by greatly improving the section modulus by preventing degradation of rigidity during deployment.

Automotive, airbag door, core part, PP resin, TALC (talc), GF (glass fiber)

Description

Method for forming passenger seat airbag door for automobile {Method for forming of passenger airbag door for automobile}             

1 is a perspective view of the passenger seat airbag door structure according to the present invention viewed from the rear bottom,

Figure 2 is a perspective view showing the configuration applied to the passenger seat airbag door structure for automobiles according to the present invention,

3 is a cross-sectional view taken along the line “A-A” of FIG. 2;

Figure 4 is a side cross-sectional view showing a mounting state of the passenger seat airbag door structure and the airbag module for a conventional vehicle,

<Explanation of symbols for the main parts of the drawings>

10 airbag door 11: skin part

12 polyurethane foam portion 13 core portion

13a: groove 20: reinforcement frame

30: tapping screw boss

40: airbag module

The present invention relates to a method for forming a passenger seat airbag door for an automobile, and more particularly, to form an airbag mounting seat and at the same time, in a core material which functions as an airbag door, a conventional PC + for cost and weight reduction. Excluding the material made of ABC resin, instead of changing to PP (Polypropylene) series material, and complementing the mechanical properties, the existing air bag by fixing the reinforcement frame to the core part by vibration welding method The present invention relates to a method for forming a passenger seat airbag door for automobiles which can secure a mechanical performance equivalent to that of a conventional PC + ABC material by greatly improving a section modulus by preventing a decrease in rigidity when deploying an airbag compared to a door.

In general, a passenger seat airbag is an airbag for the safety of a passenger in the front seat next to the driver's seat.

Looking at the installation configuration of the passenger seat airbag, as shown in Figure 4, the airbag module 300 and the airbag module 300 is mounted in the crash pad 100, the airbag module 300 is crash pad coupled to the airbag module 300 It comprises a housing bracket (not shown) to be mounted on the (100), and a rectangular plate-shaped airbag door 200 to form a surface parallel to the surface of the crash pad 100.

The installation of a passenger seat airbag having such a configuration is disclosed in Patent Application No. 10-2002-0053798, Airbag Door Structure of Assistant Drivers Seat using the name Laser scoring.

As described above, the prior art disclosed is that the airbag is opened while the airbag door 200 is opened when the airbag is deployed, the airbag door 200 is fixed to the airbag module 300 by one side rotatable hinge coupling, the other A side seam is implemented by laser scoring so that the side is fixed in normal and open when airbag is deployed.

Here, the airbag door 200 forms a door structure consisting of a skin portion 210, a core portion 220, a polyurethane (PU) foam portion 230, and a reinforcing bracket portion 240. The skin portion 210 forms the surface of the crash pad 100, and the tier seam line is applied to the rear surface by using a laser scoring method for airbag deployment.

The core part 220 maintains the shape of the crash pad 100, forms an airbag mounting seat, and also functions as an airbag door 200, and laser scoring on the same line as the skin part 210. The tier seam line is implemented using.

At this time, the airbag door 200 is secured through the lattice ribs corresponding to the reinforcement frame so that the stress can be concentrated on the tier core line.

Here, the material of the core portion 220 uses a PC + ABC material having excellent foaming resistance, flexural rigidity and impact resistance.

The polyurethane foam portion 230 is foam-filled between the skin portion 210 and the core portion 220, and implements a tier seam line by the laser scoring method together with the skin portion 210 and the core portion 220. Done.

Finally, the reinforcing bracket portion 240 is fixed to the core portion 220 with bolts or rivets 400, it is mounted for the purpose of preventing cracks of the core portion 220 when deployed.

The airbag door 200 having such a structure applies the skin part 210, the core part 220, and the polyurethane foam part 230 at the same time by using a laser scoring method. ), There is no deformation of the skin portion 210 due to the foaming pressure of the airbag, but the PC + ABC material has a problem of high price.

Accordingly, the present invention has been made to solve the above problems, and at the same time forming the airbag mounting seat surface, and in the core material that functions as an airbag door, the application of the existing expensive PC + ABC material Instead of eliminating it, it is changed to PP (polypropylene) -based material, which is more advantageous in terms of cost, and to provide a method of forming a passenger seat airbag door for automobiles, which is realized through a structural change. have.

Hereinafter, the features of the present invention for achieving the above object are as follows.

The present invention comprises the steps of: filling the PP (polypropylene) resin with a filler to provide a core portion 13 of the airbag door 10;

Molding the core part 13 by the airbag door 10 using the material;

It characterized in that it comprises a step of attaching the reinforcing frame 20 formed of the same material along the bottom edge of the core portion 13 of the molded airbag door 10.

In particular, the skin part 11 and the polyurethane foam part 12 of the airbag door 10 implement a tear seam line by a laser scoring method, and the core part 13 has a cut function. The groove 13a which has is formed. It is characterized by the above-mentioned.

The reinforcing frame 20 is fixed to the core portion 13 in a vibrating manner, and then fixed to a tapping screw boss 30.

In addition, the filler is characterized in that any one selected from TALC (talc) or GF (glass fiber).

And, the mixing ratio of the PP resin: TALC is characterized in that 8: 2.

On the other hand, the mixing ratio of the PP resin: GF is characterized in that 7: 3.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.

1 is a perspective view of a passenger seat airbag door structure according to the present invention viewed from the rear bottom, Figure 2 is a perspective view showing the configuration applied to the passenger seat airbag door structure according to the present invention, Figure 3 " AA 'line cross section.

The passenger seat airbag device of the present invention changes the material of the core portion 13 to a material which is advantageous in terms of cost and weight, and the deterioration of mechanical properties thereby uses the reinforcing frame 20 of the same material, and has a weak shape and structure. By reinforcing through one change, it is an invention that can reduce the cost and weight without changing the mechanical properties.

The PP-based material used in the preferred embodiment of the present invention uses a PP (polypropylene) -based material which can reduce the cost of the core portion 13 of the crash pad mounted on the present invention. Is PP (polypropylene or less PP) + TALC (talc) or PP + GF (glass fiber or less GF) material.

Here, the PP + TALC material, which is a material having excellent dimensional stability, smoothness, creep resistance, and the like at high temperature, is filled with TALC material, which is an inorganic filler, and each mixing ratio is mixed at 8: 2.

On the other hand, the PP + GF material is a glass fiber reinforced PP resin, each mixing ratio is 7: 3, the tensile strength and flexural modulus, the heat deformation temperature is better than the PP + TALC, but the elongation is There is a downside to falling.

At this time, when the mixing ratio of the TALC and GF is small, the physical properties are inferior, and when the mixing ratio is excessive, there is a problem that brittleness appears strongly.

Such PP-based material has lower mechanical properties such as durability and stiffness than conventional PC + ABC materials, but is advantageous in terms of cost. In a preferred embodiment of the present invention, the PP-based material is used as the airbag door (10). It is preferable to use as a material of the core portion 13 of), and the resulting mechanical properties are reduced in a direction complemented by the reinforcing frame 20 or the like.

In order to improve the low mechanical properties, first, a separate reinforcement frame 20 made of the same PP resin material is fixed by vibration welding, and the reinforcement frame 20 has a horizontal cross section having a shape of "ㄷ". The upper surface is formed with a smooth surface to be attached along the bottom edge of the core portion 13 of the airbag door 10, the rear surface is made of a lattice structure, the tapping screw boss through the rear surface The airbag module 40 is formed to be fixed by a tapping screw boss 30.

Since the reinforcement frame 20 can implement a role of a medium for maintaining rigidity when the airbag is deployed in place of the existing core part 13, the core part 13 in which the rigidity maintaining function of the present invention is excluded is a laser. There is an advantage that no scoring is required.

Therefore, only the skin part 11 and the polyurethane foam part 12 set a tear seam line by a laser scoring method, and the core part 13 adds a groove having an incision function, and as a result, This saves the power used for laser scoring.

Therefore, the present invention, compared to the prior art, by changing the material to the PP-based material, and the resulting mechanical properties of the reinforcement through the reinforcing frame 20, by comparison with the prior art that the PC + ABC material is applied It is a method of molding a new passenger passenger airbag door that can achieve mechanical performance.

As described above, according to the molding method of the passenger seat airbag door for automobiles according to the present invention, in the airbag door core portion, there is a favorable effect in terms of price and weight without changing mechanical properties compared to conventional PC + ABC material. .

Claims (6)

delete delete delete delete Filling the PP (polypropylene) resin with a filler to provide the core portion 13 of the airbag door 10, and using the material to form the core portion 13 by the airbag door 10; In the molding method of the passenger seat airbag door comprising the step of attaching the reinforcement frame 20 formed of the same material along the bottom edge of the core portion 13 of the molded airbag door 10, The mixing ratio of the PP resin: TALC is 8: 2: the molding method of the passenger seat airbag door for automobiles. Filling the PP (polypropylene) resin with a filler to provide the core portion 13 of the airbag door 10, and using the material to form the core portion 13 by the airbag door 10; In the molding method of the passenger seat airbag door comprising the step of attaching the reinforcement frame 20 formed of the same material along the bottom edge of the core portion 13 of the molded airbag door 10, The mixing ratio of the PP resin: GF is 7: 3 how to form a passenger seat airbag door for automobiles.

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