JPH11342818A - Air bag door integral instrument panel and its forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag door integral instrument panel which can be formed easily without being influenced by the size variation, the deformation and the like of a door insert, and not only can carry out the development of the air bag smoothly and securely, but also has a good appearance at the air bag door part. SOLUTION: While the groove width of the flange part insertion groove 15 of an injection molding die 10 is set larger than the thickness of the flange part 45 of a door insert 41 corresponding to the groove parts of insertion grooves 16 and 17, at the parts of at least the hinge side flange part insertion groove 16 and the opposing cleavage tip side flange part insertion groove 17, the width of a thin wall part for cleavage at the cleavage tip side 50 of the door insert is made larger than the width of a receiving projection 22 at the cleavage tip side, and after the flange part is inserted to the flange part insertion groove, a hinge side flange part 46 is pressed to an outer side wall 16a to be the door insert side of the hinge side flange part insertion groove, to position the door insert, and then, a fused resin is injected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument panel integrated with an airbag door and a method of forming the instrument panel integrated with an airbag door.

[0002]

2. Description of the Related Art In recent years, as shown in FIG. 7 and FIG. 8 showing an 8-8 section thereof, an instrument panel 70 having an airbag door D is formed for protecting occupants in the event of an automobile collision.
Is provided with an airbag device on the back side of the device. The airbag device includes an airbag case C, an airbag B folded and housed therein, and an inflator I. When the collision occurs, the inflator I operates to inflate the airbag B. D is pushed from the back side and opens to the vehicle interior, and the airbag B is deployed in the vehicle interior.

As the instrument panel having the airbag door, there are a retrofit type in which the airbag door is attached after the instrument panel is formed, and an integrated type in which the airbag door is provided integrally when the instrument panel is formed. It is considered that an integrated type is preferable in terms of molding workability and appearance deterioration due to a gap around the airbag door.

As shown in FIGS. 8 and 9, a resin door insert 71 is provided on the airbag door-integrated instrument panel when the resin instrument panel body 77 is injection-molded. Some are fixed together.

The door insert 71 comprises a plate-shaped door insert main body 72 and a flange 73 formed on the periphery of the rear surface of the door insert 71. One side of the door insert main body 72 is on the hinge side H, and the other side is on the rear surface. The cleavage side K has a concave groove-shaped thin portion 74 for opening the door insert, and the side facing the hinge side H is the cleavage tip side Ks.
The door insert 71 prevents the airbag door D from being damaged by the impact of the airbag B when the airbag B is inflated and deployed and does not scatter, etc., and also prevents the airbag door D from bending due to pressure from the vehicle interior side. It is provided for reasons such as profit. The door insert 71 is made of a polyolefin-based thermoplastic elastomer resin (TPO) or the like, and the airbag case C is attached thereto using an attachment hole 75 or the like appropriately formed in the flange portion 73.

The instrument panel main body 77 is made of a mineral-added polypropylene (PPF) or the like, and is aligned with the door insert tearing thin part 74 of the door insert 71 to form a panel body tearing thin part 78.
The tearable portions 79 of the airbag door D are constituted by the thin portions 74 and 78 for splitting. Then, when the back side of the airbag door D is pressed by the inflation of the airbag B, the airbag door D is broken at the tearable portion 79, and the airbag door D opens with the hinge side H as a fulcrum.

As shown in FIGS. 10 and 11, the instrument panel 70 with the airbag door is formed as follows.
Using an injection mold 80 for instrument panel molding,
The flange 73 of the door insert is inserted into the flange insertion groove 82 formed on the mold surface 81 on one side, the door insert 71 is arranged on the mold surface 81, and the injection mold 80 is closed.
The molten resin is injected into the cavity of the instrument panel body 7 in which the door insert 71 is fixed to the back side.
7 by injection molding. On the mold surface 81 on which the door insert 71 is arranged, a receiving convex portion 83 for receiving the thin portion 74 for opening the door insert is formed, and on the other mold surface 85, a position facing the receiving convex portion 83 is formed. Is formed with a thin portion forming projection 86 for panel body tearing, and the thin portion forming projection 86 forms a thin portion 78 for panel body tearing of the instrument panel main body.

However, the door insert 71 may be displaced during molding or may be deformed after molding.
There is a problem that the flange portion 73 does not directly enter the flange portion insertion groove 82 on the mold surface and it takes time to arrange the door insert 71. In particular, the airbag door D is often formed in a substantially rectangular shape which is horizontally long in the vehicle width direction, and the door insert 71 has a substantially rectangular shape in view of the door insert body 72 in accordance with the shape of the airbag door D. The degree of deformation and variation was large at the long sides of the small holding property, that is, the flange portions 73a and 73b on the hinge side H and the cleavage front side Ks.

In order to solve the problem of the workability of disposing the door insert 71, as shown in FIGS. 10 and 11, the groove width m of the flange insertion groove 82 is changed to the thickness of the flange 73 of the door insert 71. It is conceivable to set it larger than n. However, in this case, the flange portion 73 of the door insert can easily enter the flange portion insertion groove 82, but the flange portion 7 in the flange portion insertion groove 82 can be easily inserted.
Since the position of No. 3 is not constant, there is a problem that it is not possible to form the scheduled cleavage portion 79 at a predetermined position and with a predetermined thickness. For example, as shown in FIG. 11, when the door insert 71 is displaced toward the receiving convex portion 83 s on the tip side Ks of the cleavage, the thin portion 74 for insert-side cleavage formed in advance on the door insert receives the mold surface. The general portion 71a, which is not properly arranged on the convex portion 83s and is not made thin, includes the receiving convex portion 83s and the thin portion forming convex portion 8 for panel body cleavage.
It is located between 6 and the above-mentioned scheduled cleavage portion 79 is formed at that position. Moreover, even if the general portion 71a of the door insert 71 located on the surface of the receiving convex portion 83s is bent as shown in this figure due to the injection pressure at the time of injection molding, the thickness of the general portion 71a is not reduced. It is no longer possible to obtain a prospective cleavage part having reduced strength.

In particular, when the airbag door is released, a large moment acts on the tip end Ks of the cleavage with the hinge side H as a fulcrum to break the part 79 to be cleaved. The deviation of the thickness greatly affects the opening of the airbag door D.
Further, as a result of the general portion 71a riding on the receiving convex portion 83s, the surface 71b of the door insert 71 is located at that position.
Approaches the thin portion forming projection 86 for panel body tearing on the mold surface, and in some cases, the thin portion forming projection 86 comes into contact with the door insert surface 71b, and the door insert is inserted into the surface of the instrument panel to be cleaved. May be exposed and the appearance may be impaired.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and relates to an instrument panel integrated with an airbag door in which a door insert having a flange formed on the back surface is fixed to the back surface of the instrument panel body. The instrument panel can be easily formed without being affected by variations in the dimensions or deformation of the door insert, and the airbag can be smoothly and reliably deployed, and the appearance of the airbag door portion is also improved. An object of the present invention is to provide an instrument panel integrated with an airbag door and a method of molding the same.

[0012]

The invention according to claim 1 is
One side of the door insert body is formed by a plate-shaped door insert body and a flange formed on the periphery of the back surface, and one side of the door insert body is provided with a groove-shaped door insert tearing thin portion on the back surface. Receiving protrusions for receiving a resin door insert having a cleavage side and a side opposite to the hinge side being a cleavage tip side for receiving a flange portion insertion groove into which the flange portion is inserted and the door insert tearing thin portion. The part is formed on one side of the mold surface and the convex part for forming the thin portion for panel body cleavage facing the receiving convex part is arranged on the instrument panel injection molding die formed on the other side of the mold surface, Injection of molten resin into the cavity of the injection mold to form an instrument panel main body, whereby an airbag having a door insert fixed to the back of the instrument panel main body. In the GDOA integrated instrument panel, the groove width of the flange portion insertion groove is set to be larger than the thickness of the flange portion corresponding to those groove portions at least at the hinge side flange portion insertion groove and the cleavage tip side flange portion insertion groove portion. In addition, the width of the thin portion for tearing the door insert on the tip side of the tearing is made larger than the width of the receiving tip side receiving convex portion corresponding to the thin portion for the tearing, and after inserting the flange portion into the flange portion insertion groove, An instrument panel main body formed by pressing the hinge side flange portion against an outer side wall of the hinge side flange portion insertion groove on the outer side of the door insert to position the door insert, and thereafter injecting and molding the molten resin. It is characterized by the following.

According to a second aspect of the present invention, one side of the door insert main body includes a plate-like door insert main body and a flange formed on the periphery of the back surface of the door insert main body.
The flange portion is used to insert a resin door insert whose remaining side is a cleavage side having a groove-shaped door insert cleavage thin portion on the back surface and a side opposite to the hinge side is a cleavage tip side. A receiving convex portion for receiving the flange portion insertion groove and the thin portion for opening the door insert is formed on one mold surface, and a convex portion for forming a thin portion for panel body cleavage facing the receiving convex portion is provided on the other side. A door insert is disposed on the back surface of the instrument panel main body by disposing the instrument panel in the injection molding die for an instrument panel formed on the mold surface and injecting a molten resin into a cavity of the injection molding die to form an instrument panel main body. In the method of molding an instrument panel integrated with an airbag door, the groove width of the flange portion insertion groove is set to at least a hinge side flange. The thickness of the insertion groove and the front end flange portion at the insertion groove is set to be larger than the thickness of the flange portion corresponding to the groove portion, and the width of the thin wall portion for opening the door insert at the front end of the cleavage is set to the thin wall portion for cleavage. After the flange portion is inserted into the flange portion insertion groove, the hinge side flange portion is located outside the door insert outside the hinge side flange portion insertion groove after the flange portion is inserted into the flange portion insertion groove. To position the door insert, and then inject the molten resin.

According to a third aspect of the present invention, in the second aspect, the inner side wall portion of the hinge side flange portion insertion groove on the inner side of the door insert is advanced with respect to the outer side wall of the hinge side flange portion insertion groove. It is composed of a retreating slide type,
After inserting the flange portion of the door insert into the flange portion insertion groove, positioning is performed by pushing the hinge side flange portion against the outer side wall of the hinge side flange portion insertion groove by the slide type advance.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a part of an injection molding die in an embodiment of a method for forming an airbag door-integrated instrument panel according to the present invention, and FIG. 3 is a cross-sectional view of the same embodiment when the door insert arrangement is completed, FIG. 4 is a cross-sectional view of the same embodiment during injection molding,
FIG. 5 is a cross-sectional view showing a part of an instrument panel integrated with an airbag door obtained by the same embodiment, and FIG. 6 is a partial cross-sectional view showing another embodiment at the time of injection molding.

An injection mold 10 shown in FIG. 1 is used in an embodiment of a method for forming an instrument panel (hereinafter also referred to as an instrument panel) with an airbag door according to the present invention. Back mold 11 for molding the side and front mold 3 for molding the front side
1 and is used for molding an instrument panel having the same appearance as the instrument panel 70 shown in FIG. As shown in FIG. 3, in the injection mold 10, between the mold surface 13 of the back mold 11 and the mold surface 33 of the front mold 31 when the mold is closed, a molding cavity 25 of the instrument panel is formed. It can be opened and closed by a mechanism and is connected to the nozzle of the injection molding machine. In addition, as a device required for injection molding, such as an opening / closing mechanism and an injection molding machine, a known device used for general injection molding is used.

On the mold surface 13 of the back mold 11, a door insert arrangement portion 14 is provided at a position where the passenger side of the instrument panel is formed. The door insert arranging portion 14 is a portion where the door insert 41 described later, which has substantially the same shape as the door insert 71 shown in FIG. 9, is arranged. Around the door insert arranging portion 14, a flange portion insertion groove 15 is provided. Flange 45 of door insert 41
Is formed in a rectangular frame shape in accordance with the shape of. The flange portion insertion groove 15 is a portion into which the flange portion 45 of the door insert 41 is inserted. At least, the hinge side flange portion insertion groove 16 into which the hinge side flange portion 46 of the door insert 41 is inserted, and the cleavage opposing thereto. Regarding the cleavage front flange portion insertion groove 17 into which the front flange portion 47 is inserted, the thicknesses a and b of the corresponding hinge flange portion 46 and cleavage front flange portion 47, respectively.
The groove widths c and d are set larger than required. In this example, the groove width of the flange portion insertion groove 15 is larger than the thickness of the corresponding portion of the flange portion 45 not only at the hinge side flange portion insertion groove 16 and the cleavage tip side flange portion insertion groove 17 but also at other positions. Have been. The proportion of making the flange portion insertion groove 15 larger than the thickness of the flange portion 45 is appropriately determined, but is usually 0.5 to 2.
It is set to be about 0 mm larger. In addition, the thickness of the flange portion 45 of the door insert 41 is often the same as the entire flange portion 45 without being different between the hinge side flange portion 46 and the split front end flange portion 47.

Further, the hinge side flange portion insertion groove 16 is provided.
The inner side wall portion 16b on the inner side of the door insert 41 is connected to the hinge side flange portion insertion groove 1
Slide die 2 which moves forward and backward with respect to the outer side wall 16a
The groove width c is set to be larger than the thickness a of the hinge side flange portion 46 of the door insert when the door insert is retracted. In this example, the slide mold 2 is moved by a forward and backward device M composed of a cylinder device connected to a hydraulic supply device outside the mold.
1 moves forward and backward.

On the periphery of the door insert disposition portion 14, a receiving projection 18 is provided inside the flange insertion groove 15 except for the hinge side flange insertion groove 16 portion. The receiving projection 18 is for receiving the thin portion 42 for opening the door insert 41 of the door insert 41. In this example, the hinge side flange portion insertion groove 16 is provided.
It is provided in a substantially U-shape that opens on the side.

The mold surface 33 of the front mold 31 has a shape corresponding to the surface shape of the instrument panel to be molded, and is located along the receiving protrusion 18 at a position facing the receiving protrusion 18 of the back mold 11. A projection 32 for forming a thin portion for panel body cleavage is formed. The panel body splitting thin portion forming convex portion 32 is formed such that the instrument panel main body formed in the molding cavity 25 is formed thin at a position corresponding to the door insert splitting thin portion 42 when the airbag is inflated. The thin portion facilitates the breakage, and a predetermined gap is formed between the thin portion and the surface 43 of the door insert 41 when the injection mold 10 is closed.

Next, molding of an instrument panel using the injection mold 10 will be described. First, the door insert 41 is arranged on the door insert disposing portion 14 of the mold surface 13 of the back mold 11. Door insert 4 in this example
Reference numeral 1 denotes a resin molded product such as TPO, which comprises a rectangular plate-shaped door insert body 44 and a flange 45 formed on the back side of the periphery thereof, and one of the opposed long sides is hinged. Side 48, the other side is a thin groove portion 4 for grooved door insert cleavage inside the flange portion 45 on the back surface.
2 is formed on the cleavage side 49, and the side facing the hinge side 48 is the cleavage tip side 50. The door insert tearing thin portion 42 is formed in a shape conforming to the receiving convex portion 18 of the back mold 11, in this example, a substantially U-shape opening at the hinge side 48, and the door insert tearing end 50 on the tip end 50. The width e of the thin portion 51 is equal to the receiving convex portion 2 on the front end of the cleavage.
2 is larger than the width f by a required amount, that is, the difference (d−b) between the groove width d of the cleavage front side flange portion insertion groove 17 and the thickness b of the cleavage front side flange portion 47. Note that, in this example, the insert-cleaving thin portion 42 may be wider than the receiving convex portion 18 not only at the cleavage tip side 50 but also at other positions.

As shown in FIGS. 1 and 2, the slide insert 21 is retracted so that the groove width c of the hinge-side flange portion insertion groove 16 is made larger than the thickness a of the hinge-side flange portion 46 as shown in FIGS. This is done by inserting the flange portion 45 of the door insert into the flange portion insertion groove 15 such that the hinge side flange portion 46 is on the hinge side flange portion insertion groove 16 side. At this time, since the groove width of the flange portion insertion groove 15 is larger than the thickness of the flange portion 45, even if the door insert 41 has a dimensional variation or deformation, the flange portion 45 is inserted into the flange portion insertion groove 15. Easy to insert. Further, a thin portion 42 for cleaving the door insert on the back surface of the door insert 41.
Since the width e of the thin wall portion 51 for cleavage on the front side 50 of the cleavage is set to be larger than the width f of the receiving projection 22 on the front side of the cleavage, the thin wall portion 51 for the door insert on the front side of the cleavage.
Does not come off the surface of the corresponding receiving projection 22. Note that, in this example, a case is shown in which the distance between the hinge side flange portion 46 of the door insert 41 and the cleavage front side flange portion 47 opposed thereto is smaller than a predetermined interval.

Next, as shown in FIG. 3, the slide die 21 is advanced, and the hinge side flange portion 46 is pressed against the outer side wall 16a of the hinge side flange portion insertion groove 16 to close the die. At this time, in this example, the outer surface 46a of the hinge side flange portion 46 is used.
Is in close contact with the hinge side flange portion insertion groove 16 outer side wall 16a, and the door insert 41 is positioned with respect to the hinge side 48. At this time, a gap 24 is generated between the outer surface 47a of the cleavage distal side flange portion 47 and the outer side wall 17a of the cleavage distal side flange portion insertion groove 17, but the door insert 41 has the cleavage distal side door insert tearing thin portion 51 at the cleavage distal end. Since it is located on the surface of the side receiving convex portion 22 without being lifted from the mold surface 13 of the back mold 11,
A gap g having a correct interval is generated between the thin portion forming projection 40 for cleaving the cleavage front panel body and the front surface 43 of the door insert 41, which face the receiving projection 22 on the cleavage front side,
A projection 4 for forming a thin portion for cleaving the panel body on the tip side of the cleavage.
0 does not contact the door insert 41 surface 43.

In this state, as shown in FIG. 4, a molten resin P made of a PPF resin or the like is injected into the cavity 25, and an instrument panel main body 61 integrated with the door insert 41 is injection-molded. At that time, a concave groove-shaped panel body cleavage thin portion 62 having a predetermined thickness is formed on the surface of the instrument panel body 61 by a panel body cleavage thin portion forming projection 32 of the surface mold 31 for door insert cleavage. The thin portion 42 for opening the door insert and the thin portion 6 for splitting the panel body are formed along the thin portion 42.
2 constitutes a substantially U-shaped scheduled to-be-cleaved portion 63, and a portion surrounded by the scheduled to-cleave portion 63 is an airbag door 64.
Part. Reference numeral 66 denotes a portion to be cleaved on the tip side of the cleavage, 67
Indicates a thin portion for panel panel cleavage at the same position. The gap 24 in the flange insertion groove 17 is filled with molten resin, and a thicker flange is formed integrally with the flange 45 of the door insert. As shown in FIG. 3, the space 27 formed between the thin portion 51 for tearing the door insert and the mold surface 13 of the back mold inside the receiving protrusion 22 on the tip side of the tear, as shown in FIG. The door insert 41 is bent by the pressure at the time, and the instrument panel main body 61 is bent by the bending of the door insert 41.
The thick resin part 65 is formed inside the thin part 67 for panel body cleavage on the tip side of the cleavage in the above.

Thereafter, when the molded product is released from the mold, an instrument panel 60 according to an embodiment of the present invention shown in FIG. 5 is obtained. The instrument panel 60 thus obtained is broken at the portion 63 to be cleaved by the pressure at the time of inflation of the airbag B, the airbag door is opened, and the airbag B is opened.
Is deployed in the cabin. At this time, since the positions of the panel body tearing thin portion 67 and the door insert tearing thin portion 51 constituting the tearing tip side scheduled tearing portion 66 coincide with each other, a smooth break from the tearing tip side tearing scheduled portion 66 occurs. Then, the airbag door 64 smoothly opens with the hinge side 64a as a fulcrum. In addition, since the strength near the inner side of the to-be-cleaved portion 66 on the tip side of the cleavage is increased by the thick resin portion 65 generated by the bending of the door insert 41 during the injection molding, the tearing is weakened by the thin wall. The pressing force at the time of inflation of the airbag B more easily concentrates on the front-end-side scheduled rupture portion 66, and the rupture front-end-side scheduled rupture portion 66 is more quickly broken. In addition, at the to-be-cleaved portion 66 on the tip side of the cleavage, the door insert 4
Since No. 1 is not exposed, the appearance is good.

The example shown in FIG. 6 is a case where the distance between the hinge side flange portion 46A of the door insert 41A and the cleavage front side flange portion 47A opposed thereto is larger than a predetermined dimension. Also in this case, similarly to the above-described embodiment, first, the flange 45A of the door insert 41A is inserted into the flange insertion groove 15 of the surface mold 11 with the slide mold 21 retracted.
, The door insert 41 </ b> A is arranged in the injection mold 10. In addition, door insert 4
1A, like the door insert 41 of the above-described embodiment, a thin portion 42A for opening the door insert is formed in a substantially U-shape.

Next, the forward side of the slide die 21 pushes the hinge side flange portion 46A of the door insert 41A to push the outer side wall 16a of the hinge side flange portion insertion groove 16.
To position the door insert 41A. At this time, since the width of the thin portion 51A for opening the door at the tip of the cleavage is set to be larger than the width of the receiving convex portion 22 at the tip of the cleavage, the thin portion 51A of the door for opening the tip of the cleavage at the front of the cleavage is located on the back surface. The receiving convex portion 22 is positioned so as to fit into the receiving convex portion 22 and does not run on the receiving convex portion 22. As a result, the distance between the surface of the door insert 41 and the projection 40A for forming the thin portion of the panel body at the front end of the surface die 31 and the door insert 41 is properly maintained, and the instrument panel body 61 formed by injection molding thereafter.
A includes a thin portion 51 for opening the door insert at the tip of the cleavage.
At the position corresponding to A, the instrument panel body 61
A thin portion 67A for cleaving the panel body on the side of the cleaving end of A
Is formed, and a cleavage-end-side cleavage-scheduled portion 66A composed of both cleavage thin portions 51A and 67A is formed at a predetermined position. Reference numeral 62A denotes a thin portion for tearing the entire instrument panel body, and 63A denotes a portion of the instrument panel to be torn.

In addition, the groove 1 for inserting the flange on the tip side of the cleavage end
7, a gap 24A is formed between the inner side wall of the door 7 and the flange 47A on the front end of the door insert.
In the portion A, the thin portion 51A for splitting the door insert is bent toward the gap 24A during the injection molding to form a thick resin portion 65A in the instrument panel main body 61A. The thick resin portion 65A is located outside the receiving convex portion 22 on the tip side of the cleavage, that is, outside the portion to be cleaved 66A, and does not affect the thickness and position of the portion to be cleaved 66A.

Thereafter, when the molded product is released from the mold, a desired instrument panel 60A is obtained. The obtained instrument panel 60A integrally includes an airbag door 64A that is surrounded by the scheduled tearing portion 63A, and when the airbag inflates and breaks at the scheduled tearing portion 63A, a door is provided at the tip of the tearing. Thin part 51 for insert cleavage
Since the position of A and the thin portion 67A for panel body cleavage coincide with each other, the cleavage starts quickly and accurately. In addition, since the strength-increasing portion composed of the thick resin portion 65A is located close to the portion to be cleaved 66A on the tip side of the cleaving, the pressing force at the time of inflation of the airbag acts intensively on the portion to be cleaved 66A, so that it is more smooth And it breaks correctly and the airbag door 64A opens. In addition, the scheduled cleavage portion 6 on the tip side of the cleavage
In 6A, since the door insert 66A is not exposed,
Appearance is good.

[0030]

According to the present invention, as shown and described above, the present invention relates to an instrument panel integrated with an airbag door in which the door insert is fixed to the back side of the airbag door. However, the airbag door opens smoothly and securely,
Moreover, it is possible to easily obtain an airbag door integrated door instrument panel in which the appearance of the airbag door portion is good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of an injection mold in an embodiment of a method for forming an airbag door-integrated instrument panel according to the present invention.

FIG. 2 is a cross-sectional view showing the door insert in the middle of the same embodiment.

FIG. 3 is a cross-sectional view illustrating the door insert according to the embodiment when the arrangement of the door insert is completed.

FIG. 4 is a cross-sectional view showing the same example during injection molding.

FIG. 5 is a cross-sectional view showing a part of an instrument panel integrated with an airbag door obtained by the embodiment.

FIG. 6 is a partial cross-sectional view of an injection mold showing an injection molding in another embodiment.

FIG. 7 is a perspective view showing an example of an instrument panel integrated with an airbag door.

8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a perspective view of a door insert.

FIG. 10 is a partial cross-sectional view of an injection mold showing a door insert arrangement in a conventional molding method.

FIG. 11 is a partial cross-sectional view of an injection mold showing an injection molding in a conventional molding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection molding die 11 Backside mold 15 Flange part insertion groove 16 Hinge side flange part insertion groove 16a Outer side wall of hinge side flange part insertion groove 16b Inner side wall of hinge side flange part insertion groove 17 Cleavage tip side flange part insertion groove 18 Receiving convex Part 21 Sliding type 22 Cleavage tip side receiving convex part 31 Surface type 33 Convex part for forming a thin part for panel body cleaving 40 Convex part for forming a thin part for panel body cleaving on the cleaving front side 41 Door insert 44 Door insert body part 45 Flange Part 48 Hinge side 49 Cleavage side 50 Cleavage tip side 61 Instrument panel body 64 Airbag door

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kentaro Iwanaga 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi Pref. INOAC Corporation Sakurai Office

Claims (3)

[Claims] 1. A door insert having a plate-shaped door insert main body and a flange formed on a peripheral edge of a rear surface thereof, wherein one side of the door insert main body is hinged, and the remaining side is a concave groove-shaped door insert on the rear surface. A resin door insert having a thin side for use on the cleavage side and a side opposite to the hinge side on the front side of the split is provided with a flange portion insertion groove into which the flange portion is inserted, and a thin wall for opening the door insert. Injection molding for an instrument panel in which a receiving convex portion for receiving a portion is formed on one mold surface and a convex portion for forming a thin wall portion for cleaving the panel body facing the receiving convex portion is formed on the other mold surface. The door insert is fixed to the back of the instrument panel body by disposing it in the mold and injecting the molten resin into the cavity of the injection mold to form the instrument panel body. In the airbag door-integrated instrument panel, the groove width of the flange portion insertion groove is set to at least the hinge side flange portion insertion groove and the cleavage front side flange portion insertion groove portion at the thickness of the flange portion corresponding to those groove portions. The width of the thin portion for tearing the door insert on the tip side of the split is made larger than the width of the receiving convex portion on the tip of the split corresponding to the thin portion for splitting. After the insertion, the hinge-side flange portion is pressed against the outer side wall of the hinge-side flange portion insertion groove on the outer side of the door insert to position the door insert, and thereafter, the molten resin is injected and molded. An instrument panel integrated with an airbag door, comprising a panel body. 2. A door insert having a plate-shaped door insert main body and a flange formed on a peripheral edge of a rear surface thereof, wherein one side of the door insert main body is hinged, and the remaining side is a concave groove-shaped door insert on the rear surface. A resin door insert having a thin side for use on the cleavage side and a side opposite to the hinge side on the front side of the split is provided with a flange portion insertion groove into which the flange portion is inserted, and a thin wall for opening the door insert. Injection molding for an instrument panel in which a receiving convex portion for receiving a portion is formed on one mold surface and a convex portion for forming a thin wall portion for cleaving the panel body facing the receiving convex portion is formed on the other mold surface. The instrument panel is placed in a mold, and molten resin is injected into the cavity of the injection mold to form an instrument panel body, so that a door insert is fixed to the back of the instrument panel body. In a method of molding a fitted airbag door integrated instrument panel, the groove width of the flange portion insertion groove corresponds to at least the hinge side flange portion insertion groove and the cleavage front side flange portion insertion groove portion. The thickness of the thin portion for tearing the door insert on the tip side of the split is set to be larger than the width of the receiving convex portion on the tip of the split corresponding to the thin portion for splitting. Into the flange portion insertion groove, press the hinge side flange portion to the outer side wall of the hinge side flange portion insertion groove on the outer side of the door insert to perform positioning of the door insert, and then inject the molten resin. A method of forming an instrument panel integrated with an airbag door. 3. The slide type according to claim 2, wherein an inner side wall portion of the hinge side flange portion insertion groove on the inner side of the door insert is advanced and retreated with respect to an outer side wall of the hinge side flange portion insertion groove, An integrated airbag door, wherein after the flange portion of the door insert is inserted into the flange portion insertion groove, positioning is performed by pressing the hinge side flange portion against the outer side wall of the hinge side flange portion insertion groove by advancement of the slide die. Instrument panel molding method.