JPH10250519A - Instrument panel having air bag door integrally, and its forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of the appearance and the quality at the resin jointing part. SOLUTION: An air bag door 20 is formed by injecting a soft resin to a cavity 34 between the upper mold 30 to be the designing side of an instrument panel, and the lower mold 32. In this case, at the front end 40A of a slide core 40, the position at the air bag door 20 side is made in a step form. As a result, since the hardening layer formation of the resin surface at the air bag door 20 side is promoted, the resin at a main body 22 side injected later is made to hardly get into the resin at the air bag door 20 side injected fromerly, at a resin jointing part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument panel having a door portion of an airbag device for a passenger seat and an instrument panel, and a method of forming the same.

[0002]

2. Description of the Related Art An instrument panel integrally having an airbag door has been known, and one example thereof is disclosed in Japanese Patent Application Laid-Open No. 8-192666.

In this method of forming an instrument panel integrally having an airbag door, an instrument panel having an opening for an airbag door is injection-molded with a thermoplastic resin, and then the airbag door is formed. The airbag door and the main body of the instrument panel are integrally formed by so-called two-color molding (double injection molding) by injection molding with a thermoplastic elastomer.

[0004]

However, in such a method of forming an instrument panel integrally having an airbag door portion, a method of forming a resin joint portion between a main body portion of the instrument panel and the airbag door portion first takes place. An appearance defect occurs due to the penetration of the resin injected later into the injected resin or the deformation of the resin injected earlier due to the pressure of the resin injected later.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide an instrument panel integrally having an airbag door portion capable of preventing a deterioration in appearance quality at a resin-joined portion, and a method of forming the same.

[0006]

According to a first aspect of the present invention, there is provided an airbag door unit comprising a soft resin airbag door unit and a hard resin body unit integrally formed by two-color injection molding. In the instrument panel, a resin joint between the airbag door and the main body has a stepped shape.

Therefore, at the time of molding, the contact area between the previously injected resin and the mold increases due to the stepped shape formed on the mold. As a result, the formation of a cured layer on the resin surface is promoted, so that the later injected resin is less likely to sneak into the previously injected resin at the resin joint, and the appearance quality can be prevented from deteriorating. In addition, the joining area between the airbag door portion and the main body portion increases, so that the joining strength is improved.

According to a second aspect of the present invention, there is provided an instrument panel integrally having an airbag door portion comprising a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding. The resin joint between the airbag door and the main body has an uneven shape.

Therefore, at the time of molding, the contact area between the previously injected resin and the mold increases due to the unevenness formed on the mold. As a result, the formation of a cured layer on the resin surface is promoted, so that the later injected resin is less likely to sneak into the previously injected resin at the resin joint, and the appearance quality can be prevented from deteriorating. In addition, the joining area between the airbag door portion and the main body portion increases, so that the joining strength is improved.

According to a third aspect of the present invention, there is provided an instrument panel integrally having an airbag door portion comprising a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding. The resin joint between the airbag door and the main body has an inclined surface shape.

Therefore, at the time of molding, the contact area between the previously injected resin and the mold increases due to the inclined surface shape formed on the mold. As a result, the formation of a cured layer on the resin surface is promoted, so that the later injected resin is less likely to sneak into the previously injected resin at the resin joint, and the appearance quality can be prevented from deteriorating. In addition, the joining area between the airbag door portion and the main body portion increases, so that the joining strength is improved. Also,
Since the resin joint has an inclined surface shape, a part of the resin pressure acting on the previously injected resin is dispersed also in the thickness direction of the resin by the resin injected later, so that the resin is injected first. The internal stress of the resin is reduced, and distortion after molding can be prevented.

According to a fourth aspect of the present invention, there is provided an instrument panel integrally having the airbag door portion according to the first to third aspects, wherein an airbag door portion adjacent to the resin joining portion is provided around the airbag door portion. It is characterized in that a rib protruding on the back side is formed.

Therefore, at the time of molding, the resin pressure acting on the previously injected resin is received by the rib formed on the airbag door portion by the resin injected later. As a result, the internal stress of the resin injected earlier is reduced, and distortion after molding can be prevented.

According to a fifth aspect of the present invention, there is provided a method of molding an instrument panel having an airbag door unit integrally forming an airbag door unit and a main body unit by injection molding. The cavity is divided by a slide core having any one of a shape and an inclined shape, and in this state, an airbag door forming step of injecting and molding resin of the airbag door, and after the airbag door forming step, the slide core is formed. And a main body molding step of injection molding the resin of the main body in this state.

Therefore, at the time of molding, a stepped shape, an uneven shape,
The contact area between the previously injected resin and the slide core increases due to the tip of the slide core having one of the inclined surfaces. As a result, the formation of a cured layer on the resin surface is promoted, so that the resin injected later is
It becomes difficult to sneak into the resin injected earlier, and the appearance quality can be prevented from deteriorating by a simple molding method. Further, since the joining area between the airbag door portion and the main body portion increases, the joining strength is improved by a simple molding method.

According to a sixth aspect of the present invention, there is provided a method of molding an instrument panel integrally having an airbag door portion for integrally molding an airbag door portion and a main body portion by injection molding. The cavity is divided by the slide core, and in this state, an airbag door molding step of injection molding the resin of the airbag door section, and after the airbag door molding step, the stepped portion of the airbag door section and A step of retreating the slide core to a position where the stepped portion of the slide core and the stepped portion have a small clearance, and injecting a resin of the body in this state, a main body molding step.

Accordingly, in the main body molding step, the slide core is retracted to a position where the stepped portion of the airbag door portion and the stepped portion of the slide core have a small clearance, and the resin of the main body is injected in this state. For molding, the resin injected later passes through the small clearance portion and then reaches the resin joint in the enlarged cavity. As a result, the resin pressure acting on the previously injected resin is reduced by the later injected resin, so that the internal stress of the previously injected resin is reduced and distortion after molding can be prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of an instrument panel having an airbag door unit according to the present invention.
This will be described with reference to FIG.

As shown in FIG. 4, an instrument panel 10 provided in the passenger compartment of the vehicle includes an airbag device 12 (FIG. 3) inside the passenger seat (left side in FIG. 4).
Is partially shown).

As shown in FIG. 3, the airbag device 12
The airbag case 14 is fixed to an instrument panel reinforcement (not shown).
In the airbag case 14, an inflator 16 and an airbag 18 in a folded state are accommodated.

A portion of the instrument panel 10 substantially opposed to the airbag case 14 is an airbag door portion 20. The airbag door portion 20 is made of soft resin such as TPO (thermoplastic olefin) and TPE.
(Thermoplastic elastomer, for example, flexural modulus 100 to 5
(00 MPa, elongation at -35 ° C 50 to 300%). On the other hand, the main body part 22 of the instrument panel 10 other than the airbag door part 20 is made of T
SOP, that is, broiled elastomer (rubber) and PP (polypropylene) (technique for producing a polymer multi-component material that can be expected to have a synergistic effect), and talc is added to the composite to strengthen it. Impact resistance and rigidity And a low specific gravity PP resin having good fluidity and suitable for thin-walled products, for example, a flexural modulus of 1
500 to 2500 MPa, made of PP resin, PC / ABS resin, PC / modified PS resin, or the like.

When a sudden deceleration of the vehicle is detected by a mechanical or electrical acceleration sensor (not shown) or the like, the airbag device 12 inflates the inflator 16 in the airbag case 14.
Operates to inflate the airbag body 18 folded and housed in the airbag case 14 toward the airbag door portion 20 of the instrument panel 10.
The airbag body 18 presses the airbag door portion 20 of the instrument panel 10 to press the airbag door portion 20.
To be unfolded and deployed in the cabin. In addition,
As the airbag device 12, a conventionally known general configuration can be applied.
The detailed description of is omitted.

An upright wall portion 20A is provided upright from the periphery of the airbag door portion 20 to surround the outer periphery of the opening of the airbag case 14. Further, by surrounding the outer periphery of the opening of the airbag case 14 with the upright wall portion 20A, it is possible to prevent the airbag bag body 18 from expanding along the back surface of the main body portion 22 when inflated.

A thin portion 24 (tear portion) is formed in an H shape in a plan view at a substantially central portion in the front-rear direction and both ends in the left-right direction of the airbag door portion 20. A thin hinge portion 25 is formed in the portion. Accordingly, when the airbag door section 20 is pressed by the inflating airbag body 18 during deployment of the airbag, the airbag door section 20 is torn along the thin portion 24, and the torn airbag door section 20 is rotated, and the airbag door section 20 is rotated. An opening is formed so that the bag bag body 18 can be deployed into the vehicle interior.

A resin joint 26 with the main body 22 is formed on the outer periphery of the airbag door 20.
The cross-sectional shape of the resin bonding portion 26 is a stepped shape as a stepped shape.

Next, a method for forming an instrument panel according to the first embodiment of the present invention will be described in detail.

First, as shown in FIG. 1, an upper mold 30 as a mold on the design side of the instrument panel and a cavity 34 between the upper mold 30 and the lower mold 32 are provided with a predetermined gate (not shown). The airbag door section 20 is molded by injecting a soft resin (airbag door section molding step). At this time, at the tip 40A of the slide core 40, the portion on the side of the airbag door portion 20 has a step shape,
The contact area between the resin injected into the cavity 34 and the slide core 40 increases. As a result, formation of a cured layer on the resin surface is promoted.

As shown in FIG. 5, the distal end 40A of the slide core 40 has a box shape having a substantially rectangular sealing surface corresponding to the outer peripheral edge of the airbag door.

Further, as shown in FIG. 6, the slide core 40 is disposed in the lower mold 32 so as to be movable in the direction of coming and going with respect to the upper mold 30 (the direction of arrow A and the direction of arrow B in FIG. 6). The bottom 40B of the slide core 40 is fixed to the upper surface 44A of the slide plate 44. The slide plate 44 is fixed to a stopper cylinder 48 via a cylinder mounting plate 46. By driving the stopper cylinder 48, the slide core 40 moves in the arrow A direction or the arrow B direction in FIG. ing.

In the next main body forming step, as shown in FIG. 2, a direction (arrow B in FIG. 2) in which the slide core 40 is separated from the position where the slide core 40 abuts on the upper mold 30 (the position indicated by the two-dot chain line in FIG. 2).
In this state, the hard resin is injected into the cavity 34 and the main body 22 is injection-molded.

At this time, since the formation of a hardened layer on the resin surface on the side of the airbag door section 20 is promoted, the resin on the side of the main body section 22 injected later is injected into the resin joint section 26 by the air injected first. This makes it difficult for the bag door portion 20 to squeeze into the resin, thereby preventing a reduction in appearance quality. In addition, the resin joint 26 has a stepped shape, and the joint area between the bag door portion 20 and the main body 22 is increased.
Joint strength is improved.

Further, in the method for forming an instrument panel according to the first embodiment of the present invention, the portion of the tip 40A of the slide core 40 on the side of the airbag door 20 is formed in a step shape, so that a desired instrument panel 10 is formed. Can be easily formed.

As shown in FIG. 7, the inside of the slide core 40 is processed by an under part 52, and through a tunnel gate 54 inserted through an opening 40C formed in the slide core 40. The resin of the airbag door section 20 is injected from the nozzle 56.
At this time, a portion 58 connecting the airbag door portion 20 and the tunnel gate 54 is cut and removed by post-processing.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 8, in the instrument panel having the airbag door unit according to the second embodiment of the present invention, the cross-sectional shape of the resin joint 26 on the side of the airbag door unit 20 is uneven. It has a wavy shape.

Accordingly, in the second embodiment, in the step of forming the airbag door portion, the leading end 40 of the slide core 40 is formed.
In A, the cross-sectional shape of the portion on the side of the airbag door portion 20 is corrugated, and the contact area between the resin of the airbag door portion 20 injected into the cavity 34 and the slide core 40 increases. As a result, formation of a cured layer on the resin surface is promoted.

In the next main body forming step, as shown in FIG. 9, a direction (arrow B in FIG. 9) in which the slide core 40 is separated from the position where the slide core 40 abuts on the upper mold 30 (the position indicated by the two-dot chain line in FIG. 9).
In this state, the hard resin is injected into the cavity 34 and the main body 22 is injection-molded.

At this time, since the formation of a hardened layer on the resin surface on the side of the airbag door section 20 is promoted, the resin on the side of the main body section 22 injected later is injected into the resin joint section 26 by the air injected first. This makes it difficult for the bag door portion 20 to squeeze into the resin, thereby preventing a reduction in appearance quality. Further, the resin joint 26 has a corrugated shape, and the joining area between the bag door 20 and the main body 22 is increased, so that the joint strength of the resin joint 26 is improved.

In the method for forming an instrument panel according to the second embodiment of the present invention, a desired instrument panel 10 can be easily formed by forming the tip 40A of the slide core 40 into a corrugated shape.

The shape of the concavo-convex shape is not limited to the wave shape, but may be another shape such as a pulse shape or a sawtooth shape.

Next, a third embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 10, in the instrument panel having an airbag door unit according to the third embodiment of the present invention, the cross-sectional shape of the resin joint 26 on the side of the airbag door unit 20 is inclined. It has a surface shape.

Therefore, in the third embodiment, in the step of forming the door portion of the airbag, the distal end 40 of the slide core 40 is formed.
Since the cross-sectional shape of the portion on the side of the airbag door portion 20 in A is an inclined surface shape, the contact area between the resin of the airbag door portion 20 injected into the cavity 34 and the slide core 40 increases. As a result, formation of a cured layer on the resin surface is promoted.

In the next main body forming step, as shown in FIG. 11, the slide core 40 is separated from the position where the slide core 40 is in contact with the upper mold 30 (the position indicated by the two-dot chain line in FIG. 11) (FIG. 11).
Then, the hard resin is injected into the cavity 34 to injection-mold the main body 22 in this state.

At this time, since the formation of a hardened layer on the resin surface on the side of the airbag door section 20 is promoted, the resin on the side of the main body 22 injected later is injected into the resin joint section 26 by the air injected first. This makes it difficult for the bag door portion 20 to squeeze into the resin, thereby preventing a reduction in appearance quality. Further, the joining area between the airbag door section 20 and the main body section 22 increases, so that the joining strength improves.

Further, since the resin joint portion 26 has an inclined surface shape, the resin injected later (the resin of the main body 22) acts on the resin injected earlier (the resin of the bag door portion 20). Part of the arrow (F in FIG. 11) is also dispersed in the force in the thickness direction of the resin of the bag door section 20 (arrow F1 in FIG. 11), and the force in the plane direction of the resin of the bag door section 20 (FIG. 11). Is reduced, the internal stress of the resin of the bag door portion 20 previously injected is reduced, and distortion after molding can be prevented.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. The same members as those in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 12, in the instrument panel having an airbag door unit according to the fourth embodiment of the present invention, the back side of the airbag door unit 20 adjacent to the resin joint unit 26 is provided. And a rib 42 protruding therefrom.

Therefore, at the time of molding, the resin of the main body 22 injected later is used to mold the airbag door 2 previously injected.
The resin pressure acting on the resin No. 0 is received by the rib 42 formed on the airbag door portion 20. As a result, the internal stress of the airbag door portion 20 previously injected is reduced,
Distortion after molding can be prevented.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 14, in the instrument panel having an airbag door unit according to the fifth embodiment of the present invention, the cross-sectional shape of the resin joint 26 on the side of the airbag door unit 20 is stepped. It has a shape.

Therefore, in the fifth embodiment, first, FIG.
As shown in FIG. 4, soft resin is injected into a cavity 34 between the upper mold 30 and the lower mold 32 as a mold on the design side of the instrument panel from a predetermined gate (not shown). The airbag door section 20 is formed (airbag door section forming step). At this time, the slide core 40
At the front end 40A, the contact area between the resin injected into the cavity 34 and the slide core 40 increases because the portion on the side of the airbag door 20 has a stepped shape. As a result, formation of a cured layer on the resin surface is promoted.

In the next main body forming step, as shown in FIG. 15, the direction in which the slide core 40 is separated from the position where the slide core 40 abuts on the upper die 30 (the position indicated by the two-dot chain line in FIG. 15) (FIG. 15).
(In the direction of arrow B in FIG. 15) to a position lowered by a predetermined amount L (the position indicated by the solid line in FIG. 15), and in this state, the hard resin is injected into the cavity 34 to injection-mold the main body 22.

At this time, in the fifth embodiment, the slide core 40 is retracted to a position where the stepped portion 20B of the airbag door portion 20 and the stepped portion 40D of the slide core 40 have a small clearance S. In this state, the main body 22 is injection-molded. For this reason, the resin injected later passes through the small clearance portion, and then reaches a portion 26 </ b> A behind the resin bonding portion 26 in the enlarged cavity. As a result, the resin pressure acting on the resin of the airbag door portion 20 injected earlier is reduced by the resin of the body portion 22 injected later, so that the internal stress of the resin of the body portion 22 injected earlier is reduced. Thus, distortion of the resin of the main body 22 after molding can be prevented.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included within the scope of the present invention. It is clear to a person skilled in the art that is possible.

[0056]

According to the first aspect of the present invention, there is provided an instrument panel integrally having an airbag door portion composed of a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding. Since the resin joint between the airbag door portion and the main body has a stepped shape, there is an excellent effect that the appearance quality of the resin joint can be prevented from deteriorating. Further, it has an excellent effect that the bonding strength is improved.

According to a second aspect of the present invention, there is provided an instrument panel integrally having an airbag door portion composed of a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding. Since the resin joint between the bag door portion and the main body has an uneven shape, the resin joint has an excellent effect of preventing a reduction in appearance quality at the resin joint. Further, it has an excellent effect that the bonding strength is improved.

According to a third aspect of the present invention, there is provided an instrument panel integrally provided with an airbag door portion comprising a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding. Since the resin joining portion between the bag door portion and the main body portion has an inclined surface shape, there is an excellent effect that deterioration in appearance quality at the resin joining portion can be prevented. Further, it has an excellent effect that the bonding strength is improved. Further, it has an excellent effect that distortion after molding can be prevented.

According to a fourth aspect of the present invention, there is provided an instrument panel integrally having the airbag door portion according to the first to third aspects, wherein the back surface is provided around the airbag door portion close to the resin joint portion. Since the rib protruding to the side is formed, in addition to the effects of claims 1 to 3,
It has an excellent effect that distortion after molding can be prevented.

According to a fifth aspect of the present invention, there is provided a method of forming an instrument panel having an airbag door unit integrally forming an airbag door unit and a main body unit by injection molding. The cavity is divided by a slide core having one of a shape and a slope, and in this state, the slide core is retracted after an airbag door molding process in which the resin of the airbag door is injection molded and an airbag door molding process. In this state, a main part molding step of injection molding the resin of the main part in this state is included, so that there is an excellent effect that the appearance quality of the resin joint part can be prevented from deteriorating by a simple method. It has an excellent effect that the joining strength can be improved by a simple molding method.

According to a sixth aspect of the present invention, there is provided a method of forming an instrument panel integrally having an airbag door portion by which an airbag door portion and a main body portion are integrally formed by injection molding. The cavity is divided by the slide core, and in this state, the resin of the airbag door is injection-molded, and after the airbag door molding step, the stepped portion of the airbag door and the slide core are formed. A step of retracting the slide core to a position where the stepped portion has a small clearance, and a main body molding step of injection molding the resin of the main body in this state. It has an excellent effect of preventing reduction. Further, it has an excellent effect that distortion after molding can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an airbag door forming step in a method of forming an instrument panel integrally including an airbag door according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a main body forming step in a method of forming an instrument panel integrally including an airbag door according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG.

FIG. 4 is a perspective view showing an instrument panel integrally including an airbag door according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a slide core in the method for forming an instrument panel integrally including the airbag door portion according to the first embodiment of the present invention.

FIG. 6 is a schematic sectional side view showing a slide core and a drive unit of the slide core in the method of forming an instrument panel having an airbag door unit according to the first embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view showing a resin supply in an airbag door portion forming step in a method of forming an instrument panel integrally including an airbag door portion according to the first embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view showing an airbag door portion forming step in a method of forming an instrument panel integrally including an airbag door portion according to a second embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view showing a main body forming step in a method of forming an instrument panel integrally including an airbag door according to a second embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view showing an airbag door portion forming step in a method of forming an instrument panel integrally including an airbag door portion according to a third embodiment of the present invention.

FIG. 11 is a schematic cross-sectional view showing a main body forming step in a method of forming an instrument panel integrally including an airbag door according to a third embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view showing an airbag door portion forming step in a method of forming an instrument panel integrally including an airbag door portion according to a fourth embodiment of the present invention.

FIG. 13 is a schematic cross-sectional view showing a main body forming step in a method of forming an instrument panel integrally including an airbag door according to a fourth embodiment of the present invention.

FIG. 14 is a schematic cross-sectional view showing an airbag door portion forming step in a method of forming an instrument panel integrally including an airbag door portion according to a fifth embodiment of the present invention.

FIG. 15 is a schematic cross-sectional view illustrating a main body forming step in a method of forming an instrument panel integrally including an airbag door according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Instrument panel 12 Airbag apparatus 20 Airbag door part 22 Main body part 26 Resin joint part 30 Upper die (design side) 32 Lower die 34 Cavity 40 Slide core 40A Tip of slide core

Claims (6)

[Claims] 1. An instrument panel integrally comprising an airbag door section comprising a soft resin airbag door section and a hard resin body section integrally formed by two-color injection molding, wherein the airbag door section and the main body are provided. An instrument panel integrally having an airbag door portion, wherein a resin joint portion with the portion has a stepped shape. 2. An instrument panel integrally including an airbag door portion including a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding, wherein the airbag door portion and the main body are provided. An instrument panel integrally having an airbag door portion, wherein a resin joint portion with the portion has an uneven shape. 3. An instrument panel integrally having an airbag door portion formed of a soft resin airbag door portion and a hard resin body portion integrally formed by two-color injection molding, wherein the airbag door portion and the main body are provided. An instrument panel integrally having an airbag door part, wherein a resin joint part with the part has an inclined surface shape. 4. The airbag door portion according to claim 1, wherein a rib protruding to the rear surface side is formed around the airbag door portion close to the resin joining portion. Instrument panel with integrated. 5. A method for molding an instrument panel having an airbag door unit integrally forming an airbag door unit and a main body unit by injection molding, wherein a tip is formed into one of a stepped shape, an uneven shape, and a sloped shape. The cavity is divided by the slide core thus formed, and in this state, an airbag door part forming step of injection molding resin of the airbag door part, and after the airbag door part forming step, the slide core is retracted. A method of molding an instrument panel having an airbag door unit integrally, comprising: a main unit molding step of injection molding a resin of the main unit. 6. A method for molding an instrument panel having an airbag door unit integrally forming an airbag door unit and a main body unit by injection molding, wherein the cavity is divided by a slide core having a stepped tip. Then, in this state, an airbag door molding step of injection molding a resin of the airbag door, and after the airbag door molding step, a stepped portion of the airbag door and a stepped portion of the slide core. Wherein the slide core is retracted to a position where the clearance is a small clearance, and a main body molding step of injection molding the resin of the main body in this state is provided. Molding method.