Airbag frame mounting structure and combined weakening method

Abstract

The application discloses an air bag frame mounting structure, which comprises a body framework, an air bag frame, a foaming layer and a skin. The foaming layer is covered on the surface of the body framework, the skin is attached to the surface of the foaming layer, the air bag frame is mounted on the inner surface of the body framework, and the air bag frame is provided with an air bag door at the connecting end of the body framework. The air bag door is arched upward on one side to form a hinge. The body framework is provided with an integrally-formed weakening groove corresponding to the hinge of the air bag frame. The opening of the air bag door and the opening and closing position of the air bag door are weakening areas. A plurality of groups of laser pulse holes penetrating through the air bag frame are arranged in the weakening areas to form weakening lines. The body framework is integrally formed with the weakening groove during injection molding. The body framework is subjected to slush foaming, and then is welded with the air bag frame. The whole after welding is weakened at the weakening lines. The application solves the problem that white spots or indentations may appear on the surface of the product, reduces the air bag ejection resistance, and improves the safety.

Description

Technical Field

[0001] This invention belongs to the field of airbag frame weakening technology, and particularly relates to an airbag installation structure and a combined weakening method. Background Technology

[0002] Automotive airbags are an important component of automobiles, mostly installed on the passenger side. They consist of the dashboard body, airbag frame, and airbag. The manufacturing process includes weakening the dashboard frame and welding or snapping the dashboard frame to the airbag frame. Currently, there are two main forms of weakening the TPO material airbag frame for slush-molded dashboard bodies in the domestic market. One is that the TPO airbag frame is snapped to the body frame, and the airbag frame is weakened at the hinge position. The other is that after the slush-molded foam is completed, the body frame is first weakened by laser, and then the TPO airbag frame is welded to the body frame.

[0003] If laser weakening is performed first, and then the TPO airbag frame is welded to the main body skeleton, the strength of the main body will be reduced due to the laser weakening. The welding process will be subject to greater pressure, which may result in whitening or indentations on the product surface, affecting the product's appearance. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to solve the appearance problem of product surfaces by providing a way to weaken the combination of airbag frames, making the product more aesthetically pleasing while also increasing its safety.

[0005] Technical Solution: The present invention provides an airbag frame mounting structure, comprising a main body frame, an airbag frame, a foam layer, and a skin. The foam layer covers the surface of the main body frame, and the skin adheres to the surface of the foam layer. The airbag frame is mounted on the inner surface of the main body frame. An airbag door is provided at the connection end between the airbag frame and the main body frame, and one side of the airbag door arches upward to form a hinge. An integrally formed weakening groove is provided on the main body frame corresponding to the hinge of the airbag frame. The opening and opening / closing position of the airbag door on the main body frame constitute a weakening area. A number of laser pulse holes penetrating the airbag frame are used to form weakening lines in the weakening area.

[0006] Furthermore, the combined weakening method of the above-mentioned airbag frame mounting structure includes the following steps: Step 1: During injection molding, a weakening groove is integrally formed near the airbag frame hinge. Step 2: The main body frame is slush-molded and then welded to the airbag frame; Step 3: The welded main body frame and airbag frame are subjected to laser weakening in the set weakening area to form a weakening line.

[0007] Furthermore, the residual thickness of the weakening groove in step 1 is 0.7±0.1mm, and the width is 1.5±0.1mm.

[0008] Furthermore, the welding method in step 2 is infrared welding or vibration friction welding, and the airbag frame is made of TPO material.

[0009] Furthermore, step 3 is formed by several groups of laser weakening pulse holes, with the spacing between each group of laser weakening pulse holes being 1.5±0.1mm.

[0010] Furthermore, each group of laser weakening pulse holes has seven.

[0011] Furthermore, the diameter of a single laser weakening pulse aperture is 0.3±0.05mm, and the aperture spacing is 0.6±0.1mm.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The weakening groove is only opened at the hinge, so the strength of the frame body is guaranteed, and the product will not turn white or have indentations due to pressure during welding; 2. The airbag deployment resistance is reduced by different weakening methods, thereby improving safety; 3. The weakening groove is injection molded in one piece, eliminating the traditional weakening process and reducing the weakening cost; 4. After welding, laser weakening is performed, and the local connection parts of the airbag frame will also be penetrated by the laser, which is more conducive to airbag explosion. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the combined weakening of the present invention.

[0014] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 3 For the present invention Figure 2 A schematic diagram of the structure of section AA.

[0016] Figure 4 for Figure 2 A magnified view of region B in the middle.

[0017] Figure 5 This is a schematic diagram of the weakening line structure of the present invention. Detailed Implementation

[0018] To better illustrate the objectives, technical solutions, and advantages of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings. The present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0019] like Figure 1-4As shown, an airbag frame installation structure of the present invention includes a main body frame 1, an airbag frame 2, a foam layer 3, and a skin 4. The foam layer 3 covers the surface of the main body frame 1, and the skin 4 is attached to the surface of the foam layer 3. The airbag frame 2 is installed on the inner surface of the main body frame 1. An airbag door 5 is provided at the connection end between the airbag frame 2 and the main body frame 1. One side of the airbag door 5 arches upward to form a hinge 6. The airbag door 5 flips through the hinge 6 when it explodes. In a specific embodiment, there are two airbag doors 5, and the two airbag doors 5 and the airbag door 5 and the airbag frame 2 are connected by a number of connection points 9. The main frame 1 has an integrally formed weakening groove 7 at the hinge 6 of the airbag frame 2. The main frame 1 is a weakening area corresponding to the opening and closing position of the airbag door 5. In the weakening area, several sets of laser pulse holes 10 penetrating the airbag frame 2 are used to form weakening lines 8. These micro-holes make the material thickness of the area thinner. Many such sequentially arranged micro-holes are combined to form the weakening lines 8. The weakening lines 8 and the hinge 6 form a rectangular enclosure structure. The fracture strength at the weakening lines 8 is reduced, so it can break preferentially when subjected to external impact. The weakening groove 7, together with the hinge 6, allows the airbag door 5 to open better, allowing the inflated airbag to be discharged and protecting the safety of the occupants.

[0020] The airbag frame mounting structure of the present invention adopts a combined weakening method, including the following steps: Step 1: During injection molding, the main body frame 1 has a weakening groove 7 integrally formed near the hinge 6; in a specific embodiment, the residual thickness δ of the weakening groove 7 is 0.7mm, and the width W is 1.5mm. Because the weakening groove 7 is only opened at the position corresponding to the hinge 6, the strength of the main body frame 1 is guaranteed, and no whitening or indentation will occur due to pressure during the subsequent welding with the airbag frame 2.

[0021] Step 2: The main body frame 1 is slush-molded and then welded to the airbag frame 2; in a specific embodiment, the welding method is infrared welding or vibration friction welding, and the airbag frame 2 is made of TPO material.

[0022] Step 3: After welding the main frame 1 and the airbag frame 2, the resulting whole is weakened in a designated weakening area to form a weakening line 8. The weakening method is laser weakening. Laser weakening utilizes the high energy of a laser to create a series of micropores in the material. The material thickness in these micropore areas decreases, and many such sequentially arranged micropores combine to form the weakening line 8, reducing the fracture strength at the weakening line 8. In a specific embodiment, the diameter Φ of a single laser weakening hole 10 is 0.3 mm, seven holes are grouped together, and the hole spacing D1 is 0.6 mm; the spacing D2 between two groups of holes is 1.5 mm, and there is a group of pulse holes every 3.6 mm along the entire weakening line. Because laser weakening occurs after welding, the local connection points 9 on the airbag frame 2 are also penetrated by the laser, which is more conducive to airbag bursting.

Claims

1. A method for weakening the combination of an airbag frame mounting structure, characterized in that, The airbag frame mounting structure includes a main frame, an airbag frame, a foam layer, and a skin. The foam layer covers the surface of the main frame, and the skin adheres to the surface of the foam layer. The airbag frame is mounted on the inner surface of the main frame. An airbag door is provided at the connection end between the airbag frame and the main frame. One side of the airbag door arches upward to form a hinge. The main frame has an integrally formed weakening groove corresponding to the hinge of the airbag frame. The opening and opening / closing position of the airbag door on the main frame constitute a weakening area. In the weakening area, several sets of laser pulse holes penetrating the airbag frame form weakening lines. The combined weakening method includes the following steps: Step 1: During injection molding, a weakening groove is integrally formed near the airbag frame hinge. Step 2: The main body frame is slush-molded and then welded to the airbag frame; Step 3: The welded main body frame and airbag frame are subjected to laser weakening in the set weakening area to form a weakening line.

2. The combined weakening method of the airbag frame mounting structure according to claim 1, characterized in that, The residual thickness of the weakening groove in step 1 is 0.7±0.1mm, and the width is 1.5±0.1mm.

3. The combined weakening method of the airbag frame mounting structure according to claim 1, characterized in that, The welding method in step 2 is infrared welding or vibration friction welding, and the airbag frame is made of TPO material.

4. The combined weakening method of the airbag frame mounting structure according to claim 1, characterized in that, The weakened region described in step 3 is formed by several sets of laser weakening pulse holes, with a spacing of 1.5±0.1mm between each set of laser weakening pulse holes.

5. The combined weakening method of the airbag frame mounting structure according to claim 1, characterized in that, Each group has seven laser weakening pulse holes.

6. The combined weakening method of the airbag frame mounting structure according to claim 5, characterized in that, The diameter of a single laser weakening pulse aperture is 0.3±0.05mm, and the aperture spacing is 0.6±0.1mm.

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