JP2011011598A - Airbag door and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a vehicle interior member from scattering without impairing aesthetic appearance.SOLUTION: An airbag door 24 is constituted of two door panels 26, 26, breaking at a predetermined door breaking portion 28 formed on an instrument panel 10 made of a base material 12 and a skin material 13 which covers the obverse side of the base material 12, to form an airbag insertion opening 57 through the instrument panel 10. A branching predetermined breaking line 36 of the predetermined door breaking portion 28 is constituted of second grooves 40 deeper than first grooves 38 constituting a central predetermined breaking line 30 and a lateral edge predetermined breaking line 32.

Description

  The present invention relates to an airbag door comprising two door panels provided on a vehicle interior member and a method for manufacturing the airbag door.

  Vehicles such as passenger cars are equipped with various airbag devices for protecting the occupant's body behind or inside vehicle interior members (instrument panel, steering, glove box, pillar garnish, etc.). As shown in FIG. 6, for example, on the passenger seat side of the vehicle, the passenger seat airbag device 50 disposed on the back side of the instrument panel 10 and protecting the upper body of the passenger on the passenger seat, and the instrument panel 10 are provided. A knee airbag device 52 is provided which is disposed inside the lid member 22 of the attached glove box 20 and protects the legs of the passenger on the passenger seat. The vehicle interior members such as the instrument panel 10 and the lid member 22 that cover the front sides of the airbag devices 50 and 52 are provided with airbag doors 54 (see FIG. 6), and can be used when the airbag devices 50 and 52 are operated. When the airbag door 54 is opened, the airbag 53 is allowed to bulge toward the passenger compartment 18 (see FIG. 7).

  As the airbag door 54, a double opening type composed of two door panels 56, 56 is often employed (see FIG. 6). The airbag door 54 has a weak portion formed in advance in the vehicle interior members 10 and 22 corresponding to the door panel 56, and is pushed by the airbag 53 when the airbag devices 50 and 52 are operated, so that the vehicle interior member 10 and 22 22 is broken, and the portion surrounded by the fragile portion opens to the passenger compartment 18 side as door panels 56 and 56. In other words, in the double door type air bag door 54, the door fracture scheduled portion 58, which is a fragile portion, is formed in the vehicle interior members 10 and 22 in a shape of approximately “day” (example in FIG. 6) or approximately “H”. Yes. The airbag door 54 is formed with one airbag insertion port 57 in the vehicle interior members 10 and 22 when both door panels 56 and 56 are opened. Reference numeral 70 denotes an insert member that reinforces the periphery of the door panels 56 and 56 and the airbag door 54.

  The planned door break portion 58 extends along a boundary between the door panels 56 and 56 and forms a common break portion of the door panel, and a central break planned line 58a extends perpendicular to the central break planned line 58a. In addition, it has a side edge fracture line 58b that forms the side edge of the door panel 56 (see FIG. 6). Further, the door break scheduled portion 58 has outer edge planned break lines 58c extending between the opposite side edge planned fracture lines 58b, 58b on both sides of the central fracture planned line 58a. 54, each door panel 56 is opened with the outer edge fracture line 58c side as an opening fulcrum (see FIG. 7). The door fracture scheduled portion 58 has a branch fracture schedule that extends between the central fracture planned line 58a and the side edge planned fracture line 58b obliquely intersecting with both the central fracture planned line 58a and the side edge planned fracture line 58b. They are connected by a line 58d. As described above, the airbag door 54 is provided with the planned branch break line 58d at the planned door break portion 58, so that the breakage of the vehicle interior members 10, 22 preferentially from the planned center break line 58a It smoothly advances from the line 58a to the side edge planned break line 58b via the branch fracture planned line 58d. Further, the airbag door 54 is provided with the branch break planned line 58d so that both corners of the open end of each door panel 56 are chamfered, and a sharp portion of the door panel 56 can be removed.

JP 2002-145000 A

  As the vehicle interior members 10, 22, a foamed layer having elasticity between a base material 12 that ensures the rigidity of the vehicle interior members 10, 22 and a skin 14 having flexibility that covers the front side of the base material 12. A multi-layer structure provided with 16 is often used. In this case, the door fracture scheduled portion 58 is constituted by a groove portion 59 that is recessed from the back side of the base material 12 so as not to appear on the front side of the vehicle interior members 10 and 22 (see FIG. 7). The groove portion 59 is provided continuously to the vehicle interior members 10 and 22 in accordance with the door break scheduled portion 58 and is formed at a predetermined depth so as not to penetrate the base material 12. Here, in the airbag door 54, when the door panels 56 and 56 are opened, the airbag insertion opening is formed at a portion sandwiched between the planned branch break lines 58d and 58d branched from the same end portion of the central break planned line 58a. A substantially triangular projecting portion 60 projecting inward of 57 is formed. In the airbag door 54, since the groove part 59 is provided only in the base material 12, the skin 14 and the foamed layer 16 of the branch fracture line 58d may not be smoothly broken as the door panel 26 is opened. In this case, the protruding portion 60 that protrudes inward of the airbag insertion opening 57 and is relatively weak may be broken off along with the skin 14 or the foamed layer 16, and fragments may be scattered.

  From the viewpoint of easy breakage, the door break scheduled portion 58 is preferably formed over the entire door break planned portion 58 from the back side of the base material 12 to the vicinity of the skin 14. However, in the airbag door 54, the longer the portion where the groove 59 is deeply formed, the longer the door break scheduled portion 58 appears on the flexible skin 14, and the design of the vehicle interior members 10, 22 is impaired. In addition, if the vehicle interior members 10 and 22 are provided with long groove portions 59, the strength of the vehicle interior members 10 and 22 is excessively reduced, and the portions that become the door panels 56 and 56 are easily bent. There is a risk that the rigidity required in the state may not be satisfied. Further, when the groove 59 is formed by laser processing, if the entire door rupture portion 58 is formed up to the vicinity of the skin 14 or over a long line, discoloration or deformation of the skin 14 is likely to occur due to heat during processing. There is.

  That is, the present invention has been proposed in order to suitably solve these problems inherent in the airbag door and the manufacturing method thereof according to the prior art, and without impairing the appearance of the vehicle interior member. An object of the present invention is to provide an airbag door capable of preventing scattering and a method for manufacturing the airbag door.

In order to overcome the above-mentioned problems and achieve the intended purpose, an airbag door of an invention according to claim 1 of the present application,
It consists of two door panels which are broken at a door break planned portion formed in a vehicle interior member composed of a base material and a skin material covering the front side of the base material, and form one airbag insertion opening in the vehicle interior member In the airbag door
The door break planned portion is a center fracture planned line forming a common edge of both door panels, and a branch break planned to be branched into two so that the corners of both door panels are chamfered from the end of the center fracture planned line. A line and at least a side edge break planned line that is connected to the branch break planned line and forms a side edge of each door panel;
The center break planned line and the side edge break planned line are configured by first grooves that are formed on the back side of the vehicle interior member so as not to penetrate the base material.
The planned branch break line is formed by a second groove that opens to the back side of the vehicle interior member and penetrates the base material but does not penetrate the skin material.
According to the invention according to claim 1, since the branch fracture planned line is configured by the second groove having a depth reaching the skin material, the skin material can be more reliably fractured along the branch fracture planned line. . Moreover, since the branch break planned line is a short range in the door break planned portion, it is possible to prevent scattering of the base material and the like accompanying the opening of the door panel while suppressing the influence on the appearance and strength of the vehicle interior member.

In the invention according to claim 2, the first groove is formed so that a remaining thickness of the base material at a portion where the first groove is formed is constant, and the second groove is the second groove. The gist of the invention is that the remaining thickness of the vehicle interior member at the portion where the slab is formed is made constant.
According to the second aspect of the present invention, since the door fracture scheduled portion is managed by the remaining thickness of the base material and the vehicle interior member, the door panel is smoothly opened even if the thickness of the base material and the vehicle interior member varies. be able to.

In order to overcome the above-mentioned problems and achieve the intended object, a method for manufacturing an airbag door according to claim 3 of the present application is as follows.
It consists of two door panels which are broken at a door break planned portion formed in a vehicle interior member composed of a base material and a skin material covering the front side of the base material, and form one airbag insertion opening in the vehicle interior member In the manufacturing method for the airbag door,
By forming a first groove so as not to penetrate the base material by laser processing from the back side of the base material, a central fracture planned line that forms an edge common to both door panels in the door fracture planned portion and each door panel The side edge planned break line that forms the side edge of
Attaching the skin material to the base material,
By forming a second groove so as not to penetrate the skin material while penetrating the base material by laser processing from the back side of the base material, an end portion of the central fracture line in the planned door fracture portion From this, the two door panels are branched into two so that the corners thereof are chamfered, and a branch break planned line connected to the side edge planned break line is provided.
According to the invention according to claim 3, since the deep second groove that penetrates the base material and reaches the skin material is provided only on the planned branch fracture line that is a short range in the door fracture planned portion, The thermal effect on the vehicle interior members is small. That is, the airbag door can prevent scattering of the base material and the like accompanying the opening of the door panel while suppressing the influence on the appearance and strength of the vehicle interior member.

The gist of the invention according to claim 4 is that the grooves constituting the door break scheduled portion are formed intermittently by laser processing.
According to the invention which concerns on Claim 4, by providing a groove | channel intermittently, the thermal influence on a skin material can be made smaller.

In the invention according to claim 5, the first groove is formed so that a remaining thickness of the base material at a portion where the first groove is formed is constant, and the second groove is the second groove. The gist of the invention is that the remaining thickness of the vehicle interior member at the portion where the slab is formed is made constant.
According to the fifth aspect of the present invention, since the door fracture scheduled portion is managed by the remaining thickness of the base material and the vehicle interior member, the door panel is smoothly opened even if the thickness of the base material and the vehicle interior member varies. be able to.

  According to the airbag door according to the present invention, scattering of the vehicle interior member can be prevented without impairing the appearance. According to the method for manufacturing an airbag door according to the present invention, it is possible to obtain an airbag door that can prevent the vehicle interior member from being scattered without impairing the appearance.

It is a principal part top view of the instrument panel which provided the airbag door which concerns on the suitable Example of this invention. In the instrument panel which provided the airbag door of the Example, it is a schematic perspective view shown in the state which isolate | separated the insert member. It is an AA line schematic sectional drawing of FIG. It is a BB schematic sectional drawing of FIG. It is explanatory drawing which shows the manufacture process of the airbag door of an Example. It is a fragmentary perspective view which shows the airbag door provided in the instrument panel and the airbag door provided in the glove box. FIG. 7 is an enlarged sectional view taken along the line CC in FIG. 6.

  Next, a preferred embodiment of the airbag door and the manufacturing method thereof according to the present invention will be described below with reference to the accompanying drawings. The airbag door of the present application is a double door type composed of two door panels disposed on various vehicle interior members. In the embodiment, an explanation will be given by exemplifying an airbag door provided corresponding to a passenger seat airbag device in an instrument panel which is a vehicle interior member. In addition, about the structure similar to the member already shown in FIG.6 and FIG.7 quoted in description of a prior art, the same code | symbol is attached | subjected and demonstrated.

  As shown in FIG. 1 or 2, an instrument panel (vehicle interior member) 10 provided with an airbag door 24 according to the embodiment includes a base material 12 that ensures the rigidity of the instrument panel 10, and the base material. 12 is a multi-layer structure comprising a skin 14 that covers the front side of 12 and forms a design surface facing the passenger compartment 18 in the instrument panel 10, and a foam layer 16 provided between the base material 12 and the skin 14. The base 12 is made of a solid body such as polypropylene (PP), and is set to a thickness of about 2.5 mm, for example. The skin 14 is made of a flexible material such as an olefinic thermoplastic elastomer (TPO). As the foam layer 16, a cell structure having elasticity such as polypropylene (PP) or polyethylene (PE) is used. In the embodiment, the instrument panel 10 is formed by joining the skin material 13 in which the skin 14 and the foam layer 16 are integrally formed to the base material 12 coated with an adhesive. The thickness of the skin material 13 is about 2.0 mm (skin 0.5 mm, foam layer 1.5 mm).

  The airbag door 24 is a so-called double-open type, and is provided on the instrument panel 10 corresponding to the airbag device 50 disposed on the back side of the instrument panel 10. The airbag door 24 includes two door panels 26 and 26 surrounded by a door break scheduled portion 28 provided on the instrument panel 10. The airbag door 24 receives the inflation of the airbag 53, and the instrument panel 10 is broken at the door break scheduled portion 28, so that the door panels 26 and 26 are opened to the passenger compartment 18 side. The airbag door 24 of the embodiment is provided with door panels 26 and 26 arranged in the instrument panel 10 in the front-rear direction of the vehicle, and the door panel 26 positioned on the front side of the vehicle opens to the front side and is positioned on the rear side of the vehicle. The door panel 26 is configured to open to the rear side.

  The said door fracture | rupture scheduled part 28 is the part which made the instrument panel 10 thin and weakened by forming the groove | channels 38 and 40 so that it may open in the back side of the instrument panel 10 (refer FIG. 3 or FIG. 4). is there. That is, the airbag door 24 is a so-called invisible type in which the door fracture scheduled portion 28 does not appear on the passenger compartment 18 side. In the embodiment, the door break scheduled portion 28 is provided so as to extend in a substantially “day” shape (see FIG. 1 or FIG. 2).

  The door break scheduled portion 28 is provided in the instrument panel 10 with a central fracture planned line 30 extending in the vehicle width direction of the vehicle and spaced apart in the vehicle width direction across the central fracture planned line 30. It has a side edge break planned line 32 extending in the longitudinal direction of the vehicle perpendicular to the planned line 30 (see FIG. 1). Further, the door break scheduled portion 28 is provided so as to be spaced apart in the vehicle front-rear direction across the center break planned line 30 and extends between the side edge planned break lines 32, 32 that form a pair separated in the vehicle width direction. And has an outer edge planned fracture line 34 extending. Furthermore, the door fracture scheduled portion 28 is provided to branch into two at each end portion of the central fracture planned line 30 and extends so as to obliquely intersect both the central fracture planned line 30 and the side edge planned fracture line 32. It has an existing branch fracture line 36.

  In the airbag door 24, the central break planned line 30 is common to both door panels 26, 26 and constitutes the edge on the open end side, and each outer edge planned break line 34 parallel to the central break planned line 30 is each An edge portion on the open fulcrum side of the door panel 26 is formed, and a side edge planned break line 32 forms a side edge of the door panel 26. In the airbag door 24, the left and right end portions of the central fracture planned line 30 and the corresponding central edge portion of the side edge fracture planned line 32 are connected by a branch fracture planned line 36. The two corners on the open end side of each door panel 26 are chamfered by a branch break planned line 36 that branches into two and extends diagonally. In the instrument panel 10, when the door panels 26 and 26 are opened, a portion sandwiched between the branch break planned lines 36 and 36 branched from the same end portion of the central break planned line 30 is the airbag insertion opening 57. It remains as a substantially triangular projecting portion 60 projecting inward.

  In the airbag door 24, a central fracture planned line 30, a side edge planned fracture line 32, and an outer edge planned fracture line 34 except for the branch fracture scheduled line 36 open to the back side of the instrument panel 10 and penetrate the base material 12. The first groove 38 is formed so as not to occur (see FIG. 3). On the other hand, the airbag door 24 is opened to the back side of the instrument panel 10 and is planned to branch and break at the second groove 40 formed so as to penetrate the base material 12 but not the skin material 13. 36 is configured (see FIG. 4). The 2nd groove | channel 40 of an Example is recessedly provided so that the base material 12 and the foaming layer 16 may be penetrated, and the outer skin 14 may be reached. In the airbag door 24, only the planned branch break line 36 has a deep groove at the door break planned portion 28, thereby facilitating breakage of the portion sandwiched between the planned branch break lines 36 and 36.

  The branch break planned line 36 is preferably set to have an extension length of 5 to 15 mm. This is because if the planned branch break line 36 is shorter than 5 mm, the chamfering of the door panel 26 is not sufficient, and the object of eliminating the sharp part of the door panel 26 is difficult to achieve. Due to the depth of the two grooves 40, the branch fracture line 36 is likely to appear on the front side of the instrument panel 10. In addition, the airbag door 24 has an angle formed by two branch break planned lines 36 and 36 extending in directions away from the end of the center fracture planned line 30 so as to be separated from each other. It is preferable to set in the range. In the airbag door 24, both the angle formed by the center break planned line 30 and the branch break planned line 36 and the angle formed by the branch break planned line 36 and the side edge planned break line 32 are closer to each other as much as possible. This is because it is desirable from the viewpoint of smooth progress of breakage from the central fracture line 30.

  The airbag door 24 has a first groove 38 and a second groove 40 formed by laser processing. The door fracture scheduled portion 28 is configured by intermittently arranging grooves 38 and 40 at a predetermined pitch, and, for example, the grooves 38 and 40 having a diameter of 0.2 mm are connected at intervals of 0.5 mm. The first groove 38 is formed so that the remaining thickness of the substrate 12 is constant (for example, about 0.15 mm). The second groove 40 is formed such that the remaining thickness of the skin material 13 is constant (for example, about 0.15 mm), and the remaining thickness of the instrument panel 10 is the same between the portions where the second groove 40 is formed. Further, the airbag door 24 is formed so that the remaining thickness of the base material 12 at the site where the first groove 38 is formed and the remaining thickness of the instrument panel 10 at the site where the second groove 40 is formed. .

  The airbag door 24 includes an insert member 70 as a reinforcing member (see FIG. 2). The insert member 70 is a member formed by injection molding from a synthetic resin material having high toughness and high flexibility such as olefin-based thermoplastic elastomer (TPO). The insert member 70 includes a rectangular tube-shaped main body 72 that is welded to the back side of the instrument panel 10 that forms the periphery of the airbag door 24 in accordance with the form of the double-opening type airbag door 24, and each door panel 26. The panel support portion 74 is welded to the back surface of each part, and the hinge portion 76 is provided between the main body portion 72 and the panel support portion 74. The insert member 70 is provided with a hinge portion 76 on the side of the main body portion 72 along the planned outer edge fracture line 34. The airbag door 24 of the embodiment is configured to be opened when each door panel 26 is supported by the hinge portion 76 via the panel support 74.

  According to the airbag door 24 of the embodiment, the branch break planned line 36 is constituted by the second groove 40 having a depth reaching the skin material 13, so that the foamed layer 16 and the skin 14 are formed along the branch break planned line 36. Can be more reliably broken. That is, it is possible to avoid applying excessive force to the protruding portion 60 as the door panel 26 is opened, and to prevent the base material 12 and the like from being scattered due to breakage of the protruding portion 60. In the airbag door 24, only the second groove 40 constituting the branch fracture planned line 36 is set to a depth reaching the skin material 13, and the other fracture schedule lines 30, 32, 34 configuring the other planned fracture line 30 of the door 28 are formed. One groove 38 has a depth that does not penetrate the substrate 12. In the airbag door 24, the planned branch break line 36 is intended for the smooth transmission of the break from the center break planned line 30 to the side edge break planned line 32 and the chamfering of the door panel 26. It is shorter than the planned fracture line 32 and the planned outer edge fracture line 34. Thus, the airbag door 24 is provided with the deep second groove 40 only in the planned branch break line 36 that is a short range in the door break planned portion 28, so that the appearance and strength of the instrument panel 10 are increased. Does not affect.

  Next, a method for manufacturing the airbag door 24 according to the embodiment will be described. A processing device 80 used for laser processing of a door break scheduled portion in an airbag door is provided with a holding mechanism (not shown) for holding a processing target such as the base material 12 or the instrument panel 10 and a processing target. An irradiation unit 82 for irradiating a laser beam and a light receiving means 84 provided on the opposite side across the irradiation unit 82 and the workpieces 10 and 12 are provided (see FIG. 5A). The processing device 80 is configured to move the processing objects 10 and 12 based on the processing data input in advance by the holding mechanism so that the portion to be the door fracture scheduled portion 28 is sequentially exposed to the irradiation unit 82. The processing apparatus 80 detects the laser light leaking from the processing objects 10 and 12 by the light receiving means 84, and thereby manages the remaining thickness of the processing object. That is, in the processing apparatus 80, since the processing objects 10 and 12 have a sufficient thickness at the beginning when the processing objects 10 and 12 are irradiated with laser light from the irradiation unit 82, the processing objects 10 and 12 The laser beam cannot be detected by the light receiving means 84 because of being blocked. In the processing apparatus 80, when the grooves 38 and 40 are formed by the laser light on the processing objects 10 and 12 and the remaining thickness of the processing objects 10 and 12 becomes small, the laser light is detected by the light receiving means 84.

  If the processing objects 10 and 12 are made of the same material, the timing at which the laser beam having a predetermined intensity leaks by the formation of the grooves 38 and 40 is the same. Therefore, according to the processing apparatus 80 of the embodiment, the processing object 10 , 12 can be managed accurately. For example, there is a method of managing the door fracture scheduled portion according to the groove formation depth, but this method has a disadvantage that the remaining thickness does not become constant when the thickness of the workpiece is changed. On the other hand, since the processing apparatus 80 of the embodiment is configured to directly manage the remaining thickness of the workpieces 10 and 12, the processing apparatuses 80 of the workpieces 10 and 12 can be managed without managing the depth of the grooves 38 and 40. Since the remaining thickness is constant, when the airbag apparatus 50 is operated, the entire door rupture portion 28 is ruptured smoothly, and stable opening of the door panels 26 and 26 can be achieved.

  In the first stage of manufacturing, the back side of the substrate 12 is set to the irradiation mechanism 82 in the holding mechanism of the processing device 80, and the planned center fracture line 30 side excluding the planned branch fracture line 36 in the door fracture schedule part 28. A first groove 38 constituting the edge break planned line 32 and the outer edge break planned line 34 is formed (see FIG. 5A). In the first stage, by irradiating the back side of the base material 12 with a laser from the irradiation unit 82, the first groove 38 is bored so as not to penetrate the base material 12, and the first groove 38 is detected by the light receiving means 84. It is formed to a depth that provides a predetermined remaining thickness. And when the 1st groove | channel 38 is formed, the base material 12 is moved by a holding mechanism, the formation planned position of the next 1st groove | channel 38 is made to face the irradiation part 82, and the next 1st groove | channel 38 is made to be irradiated by the irradiation part 82. Form. As described above, in the first stage, the formation of the first groove 38 and the movement of the base material 12 are repeated, so that the first groove constituting the central fracture planned line 30, the side edge fracture planned line 32, and the outer edge fracture planned line 34 is formed. 38 are provided at a predetermined pitch.

  In the second stage of production, the base material 12 provided with the central fracture line 30, the side edge fracture line 32, and the outer edge fracture line 34 is removed from the processing apparatus 80, and an adhesive is applied to the front side of the base material 12, The skin material 13 composed of the skin 14 and the foam layer 16 is joined to form the instrument panel 10 (see FIG. 5B). The skin material 13 is pressure-bonded to the base material 12 by evacuation.

  In the third stage of manufacturing, the back side of the instrument panel 10 is set in the holding mechanism of the processing apparatus 80 with the irradiation unit 82 facing, and the second groove 40 constituting the branch fracture planned line 36 in the door fracture planned part 28 is formed. Form. In the third stage, by irradiating the back side of the instrument panel 10 (base material 12) with a laser from the irradiation unit 82, the second groove 40 is penetrated through the base material 12 but not through the skin material 13. And the second groove 40 is formed to a depth at which a predetermined remaining thickness is obtained by detection of the light receiving means 84. When the second groove 40 is formed, the instrument panel 10 is moved by the holding mechanism so that the next formation position of the second groove 40 is made to face the irradiation unit 82, and the next second groove 40 is formed by the irradiation unit 82. Form. As described above, in the third stage, the second groove 40 constituting the branch fracture planned line 36 is provided at a predetermined pitch by repeating the formation of the second groove 40 and the movement of the instrument panel 10. An airbag door 24 is provided.

  In the groove processing by the laser described above, if the groove 40 is drilled up to the foam layer 16, the foam layer 16 functions as a heat insulating material, so that heat tends to be trapped, and if the grooves 40 are arranged over a long distance, there is a possibility that the skin 14 is affected by heat. Becomes higher. In the method of manufacturing the airbag door 24 according to the embodiment, only the deepest branch rupture line 36 which is a short range in the door rupture scheduled portion 28 is penetrated through the base material 12 and the foamed layer 16 and reaches the outer skin 14. Since the two grooves 40 are provided, even if the second groove 40 is drilled to the inside of the skin 14, the thermal effect on the skin 14 due to laser processing is small. Further, the first groove 38 constituting the central fracture planned line 30, the side edge fracture planned line 32, and the outer edge planned fracture line 34 extending in a relatively long range in the door fracture planned portion 28 penetrates the base material 12. Therefore, even if the first grooves 38 are arranged over a long range, the substrate 12 and the foamed layer 16 are obstructed and the thermal effect on the skin 14 due to laser processing can be avoided. Furthermore, in the manufacturing method, since the first groove 38 and the second groove 40 are not continuously formed in a trench shape but intermittently formed at a predetermined pitch, the thermal effect on the skin 14 due to laser processing is further increased. Can be small. As described above, according to the method of manufacturing the airbag door 24 of the embodiment, the second groove is formed only in a portion of the door rupture scheduled portion 28 where the assist of the cleavage is particularly necessary while minimizing the thermal influence due to the laser processing. Since 40 is provided, the appearance and strength of the instrument panel 10 are not affected by the door break scheduled portion 28.

  The airbag door 24 is formed so that the remaining thickness of the base material 12 in the portion where the first groove 38 is formed is constant, and the remaining thickness of the instrument panel 10 in the portion where the second groove 40 is formed. It is formed to be constant. Therefore, since the airbag door 24 manages the remaining thickness of the planned door fracture portion 28, the remaining thickness of the planned door fracture portion 28 changes even if the thickness of the base material 12, the foam layer 16 and the skin 14 changes. Therefore, when the airbag 53 is inflated, the door break scheduled portion 28 is broken as set, and the door panels 26 and 26 can be opened stably.

(Example of change)
(1) The airbag door of the present application is implemented in the airbag door provided in the portion corresponding to the knee airbag device 52 in the lid member 22 of the glove box 20 in which the knee airbag device 52 shown in FIG. It is also possible to do. Furthermore, although not shown in the drawings, the present invention can be applied to an airbag door provided in the pillar garnish, an airbag door provided in the steering, or the like.
(2) The planned branch fracture line is not limited to the straight line shown in each embodiment, but may be a form extending in a curved line.
(3) In the embodiment, the planned fracture line is configured by continuously arranging the dotted grooves, but the groove whose longitudinal side extends along the extending direction of the planned fracture line may be intermittently arranged, It may be a continuous groove.

10 instrument panel (vehicle interior member), 12 base material, 13 skin material,
26 door panel, 28 door break planned part, 30 center broken planned line,
32 Side edge fracture planned line, 36 Branch fracture planned line, 38 1st groove, 40 2nd groove,
57 Airbag insertion port

Claims (5)

It consists of two door panels which are broken at a door break planned portion formed in a vehicle interior member composed of a base material and a skin material covering the front side of the base material, and form one airbag insertion opening in the vehicle interior member In the airbag door
The door break planned portion is a center fracture planned line forming a common edge of both door panels, and a branch break planned to be branched into two so that the corners of both door panels are chamfered from the end of the center fracture planned line. A line and at least a side edge break planned line that is connected to the branch break planned line and forms a side edge of each door panel;
The center break planned line and the side edge break planned line are configured by first grooves that are formed on the back side of the vehicle interior member so as not to penetrate the base material.
The branch break planned line is formed of a second groove that is opened on the back side of the vehicle interior member and penetrates the base material but does not penetrate the skin material. Bag door.   The first groove is formed so that the remaining thickness of the base material at a portion where the first groove is formed is constant, and the second groove is the vehicle interior of the portion where the second groove is formed. The airbag door of Claim 1 formed so that the remaining thickness of a member may become fixed. It consists of two door panels which are broken at a door break planned portion formed in a vehicle interior member composed of a base material and a skin material covering the front side of the base material, and form one airbag insertion opening in the vehicle interior member In the manufacturing method for the airbag door,
By forming a first groove so as not to penetrate the base material by laser processing from the back side of the base material, a central fracture planned line that forms an edge common to both door panels in the door fracture planned portion and each door panel The side edge planned break line that forms the side edge of
Attaching the skin material to the base material,
By forming a second groove so as not to penetrate the skin material while penetrating the base material by laser processing from the back side of the base material, an end portion of the central fracture line in the planned door fracture portion A method of manufacturing an airbag door, characterized in that a branch break planned line is provided that branches into two so that the corners of both door panels have a chamfered shape and continues to the side edge planned break line.   4. The method of manufacturing an airbag door according to claim 3, wherein the groove constituting the door fracture scheduled portion is formed intermittently by laser processing.   The first groove is formed so that the remaining thickness of the base material at a portion where the first groove is formed is constant, and the second groove is the vehicle interior of the portion where the second groove is formed. The manufacturing method of the airbag door of Claim 3 or 4 formed so that the remaining thickness of a member may become fixed.

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