JP4047521B2 - Manufacturing method of air bag grid part - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an airbag grid portion of an airbag apparatus provided in a vehicle such as an automobile.
[0002]
[Prior art]
Some vehicles such as automobiles have an airbag device as a safety means in an emergency. In the airbag device, when an impact force of a predetermined value or more is applied to the vehicle body, the bag body that is folded and housed in a housing disposed inside an instrument panel or the like has a pressure gas pressure from the inflator. Therefore, the head of the passenger seated at a fixed position is received and protected so that the head does not come into contact with the instrument panel or the like.
[0003]
When the bag body is inflated, it presses the airbag grid part formed on the instrument panel or the like, and forms a bulge opening by cleaving the tear line formed in the airbag grid part. It is designed to bulge from the opening toward the passenger in the passenger compartment.
[0004]
A conventional method for manufacturing an air bag grid portion is described in, for example, Japanese Patent Application Laid-Open No. 8-268205. According to the above publication, when molding the air bag grid portion by injecting and filling the molding resin into the mold space of the molding die, the notch processing jig is inserted into the molding resin after completion of the injection and filling of the molding resin to process the cleavage line. I try to do it. The notching jig is pulled out from the molded product after the molding resin is cured and released.
[0005]
[Problems to be solved by the invention]
In the air bag grid part manufacturing method described in the above publication, a notch processing jig is inserted into the molding resin after completion of injection filling of the molding resin, and the notching jig is pulled out from the molded product after the molding resin is cured or released. However, if the above-described method is applied to molding a high-quality airbag grid portion having an elastically deformable skin material, the following problems occur.
[0006]
That is, when the notch processing jig is inserted after the injection and filling of the molding resin into the mold space in which the elastically deformable skin material is set, the pressure of the molding resin around the notching jig increases, and the skin material is partially Will be compressed.
[0007]
And if the notch processing jig is pulled out from the molded product after the molding resin is cured and released, the compressed portion of the skin material will be restored. The notched part is swollen and the appearance quality is poor.
[0008]
Accordingly, an object of the present invention is to provide a method for manufacturing an air bag grid part that can solve the above problems and can satisfactorily mold an air grid part having an elastically deformable skin material with a cleavage line. is there.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, in the invention described in claim 1 or 2, a skin material capable of being compressed and restored by elastic deformation is set in a mold space of a mold, and a core material is provided on the back surface side of the skin material. When forming the air bag grid part by injection filling with resin, a notch processing jig that can be inserted into and extracted from the mold space is used to form a partial thinned part in the air bag grid part. Yes.
[0010]
According to the invention according to claim 1 or 2 configured as described above, a high-quality air bag grid portion having a skin material that can be compressed / restored by elastic deformation is inserted into a thin-walled processing portion such as a cleavage line. It becomes possible to mold.
[0011]
The invention described in claim 1 or 2 is characterized in that the notch processing jig is inserted into or extracted from the mold space before the core resin is cured in the mold.
[0012]
According to the invention concerning Claim 1 or 2 comprised in this way, the skin material which can be elastically deformed is made by performing insertion / extraction operation of the notch processing jig before the core resin hardens. The air bag grid portion having a high quality can be molded well in a state where a thin-walled processing portion such as a cleavage line is included.
[0013]
In the invention described in claim 1, the insertion operation of the notching tool I line before completion of filling of the core material resin, to increase the pressure of the core resin of a portion notching tool is projected The skin material is partially compressed by this pressure to improve the flow reduction of the core resin, and the pulling operation of the notching jig is performed after the completion of the filling of the core resin and the pressure holding state of the core resin. This is done just before cooling, when the cut is cut, and the notched part is crushed with the thinned part remaining unfused by the restoring force of the partially compressed skin material and the residual stress inside the core resin. It is characterized by that.
[0014]
According to the thus configured invention according to claim 1, said notching tool be pulled out from the mold space when pressure holding state of the filling completion a and the core material resin of the core material resin has expired Thus, the notched portion attached by the notching jig is crushed by the restoring force of the skin material and the residual stress inside the core material resin during the curing of the core material resin, thereby restoring the skin material. The force and the residual stress inside the core material resin are relieved and eliminated. Therefore, the portion compressed by the notch processing jig of the skin material is prevented from expanding after being released from the mold, and a good airbag grid portion can be obtained.
[0015]
In addition, when the notch processing jig is removed, a resin film is formed on the surface by cooling and hardening a portion of the core resin that is in contact with the notch processing jig. Even if the material is crushed, the resin coatings are not fused together, and the thin-wall processed portion remains.
[0016]
And since the intensity | strength of this part is improved when a notch process part is crushed, the feeling of stickiness of an air bag grid part is reduced.
[0017]
In the invention described in claim 2, I-line insertion operation of the notching tool after completion filling of the core material resin, to increase the pressure of the core resin of a portion notching tool is protruded, The skin material is partially compressed with this pressure, and the pulling operation of the notch processing jig is performed after completion of filling of the core material resin and immediately before cooling when the pressure holding state of the core material resin is cut off. The notched portion is crushed in a state in which the thin-walled portion remains without being fused by the restoring force of the skin material that is compressed and the residual stress inside the core resin .
[0018]
According to the invention of claim 2 configured as described above, the same operation as that of claim 1 can be obtained.
[0019]
The invention described in claim 3 is characterized in that a cleavage line is formed on the back surface side of the air bag grid portion by inserting the notch processing jig into the back surface side of the skin material.
[0020]
According to the invention concerning Claim 3 comprised in this way, a cleavage line can be obtained in the back surface side of an airbag grid part.
[0021]
In the invention described in claim 4 , by inserting another notch processing jig from the surface side of the skin material, a character line or a thin skin portion on the surface side of the air bag grid portion with respect to the thin wall processing portion. It is characterized by being formed partially or entirely.
[0022]
According to the invention concerning Claim 4 comprised in this way, a character line or a thin skin part can be partially or entirely formed in the surface side of an airbag grid part with respect to the said thin processed part.
[0023]
In the invention described in claim 5 , by inserting another notch processing jig from the surface side of the skin material in the mold for forming the thinned portion, a character is formed on the surface side of the airbag grid portion. A thin part of the line or skin is formed partially or entirely with respect to the thin-wall processed part.
[0024]
According to the invention concerning Claim 5 comprised in this way, using the shaping | molding die which forms a thin wall processing part, a character line or an outer skin thin part is a part with respect to the said thin wall processing part on the surface side of an airbag grid part. Or overall.
[0025]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Hereinafter, a specific first exemplary embodiment of the present invention will be described together with illustrated examples.
[0026]
1 to 8 show a first embodiment of the present invention.
[0027]
First, the configuration will be described. FIG. 1 shows an instrument panel 1 of a vehicle such as an automobile, and the airbag device is provided on the passenger seat side of the instrument panel 1. The airbag grid part 2 of the airbag device is formed integrally with the instrument panel 1, and a tear line 3 is formed on the back side of the airbag grid part 2, which becomes an inflation opening of the airbag body by cleavage. Has been. The cleavage line 3 has an H shape in plan view. The cleavage line 3 may be U-shaped or the like.
[0028]
The airbag grid 2 may be configured separately from the instrument panel 1 and attached to an opening formed in the instrument panel 1. Further, although not shown in particular, the airbag grid part 2 may be provided on a boss part of a steering wheel or a door trim part.
[0029]
As shown in FIG. 2, the airbag grid part 2 sets a skin material 10 that can be elastically deformed in a mold space 9 of a mold 8 including a cavity mold 6 and a core mold 7, and the back surface side of the skin material 10. The core material 13 is manufactured by injection-filling the core material resin 12 through the gate 11 formed in the cavity type 6.
[0030]
As the skin material 10 that can be elastically deformed, as shown in FIG. 4A, a multilayer material 18 such as a three-layer laminate sheet integrally having a skin layer 15, a foam layer 16, a barrier layer 17, and the like is used. The multilayer material 18 may be a two-layer laminate sheet or a multilayer laminate sheet having four or more layers.
[0031]
The core mold 7 has a notch processing jig 22 that can be inserted / extracted in the thickness direction of the molded product (air bag grid part 2) in the mold space 9 to form a partially thinned part 21 in the air bag grid part 2. Is provided.
[0032]
At this time, by inserting the notch processing jig 22 into the back surface side of the skin material 10, the thin processed portion 21 such as the cleavage line 3 is formed on the back surface side of the airbag grid portion 2.
[0033]
As shown in FIG. 5, the notching jig 22 has a substantially convex tip shape in which a rectangular portion 23 and a triangular portion 24 are combined in a side view. The triangular portion 24 has, for example, a sharp isosceles triangle shape with a base of 2 mm and a height of 4 mm. An inclined guide surface 25 is formed at the rear end of the notching jig 22. The core die 7 is provided with a drive mechanism 27 such as a cylinder having a rod 26 capable of moving back and forth in a direction perpendicular to the insertion / extraction direction of the notch processing jig 22. A tapered surface 28 is formed which can be slidably contacted. As shown in FIG. 3, the guide surface 25 and the tapered surface 28 are fitted and locked by a slide fitting portion 46 so as to be slidable in the surface direction. The drive mechanism 27 and the working medium supply / discharge mechanism 30 that supplies / discharges a working medium 29 such as hydraulic oil or compressed air to / from the drive mechanism 27 constitute an insertion / extraction mechanism 31 for the notch processing jig 22. Further, an ejector pin 33 that can be driven by a drive mechanism 32 such as a cylinder is provided in the core mold 7.
[0034]
And it sets so that insertion / extraction operation of the notch processing jig | tool 22 to the type | mold space 9 may be performed before hardening of the core resin 12. FIG.
[0035]
As shown in FIG. 6, one molding cycle of the air grid portion 2 includes setting of the skin material 10 to the mold 8, clamping of the mold 8, injection filling of the core resin 12 into the mold space 9, and pressure holding. , Cooling, mold opening, and mold release. In FIG. 6, one molding cycle starts with mold clamping.
[0036]
More specifically, the notch processing jig 22 is inserted before the core resin 12 is filled (before injection, at the beginning of injection, or during injection, immediately after the start of injection in FIG. 6). The drawing operation of the notching jig 22 is performed after the filling of the core material resin 12 is completed and when the pressure holding state of the core material resin 12 is cut (immediately before cooling).
[0037]
Here, the pressure holding state is a state where an injection pressure, an injection secondary pressure, an injection tertiary pressure, an injection quaternary pressure or the like is acting in the case of injection molding, or in the case of injection press molding. The resin filling pressure is acting, or the resin filling process is performed by the mold clamping pressure or the mold clamping speed.
[0038]
Note that ultrasonic vibration may be applied to the notching jig 22 being inserted. Further, the amount of protrusion of the notch processing jig 22 toward the back side of the air grid portion 2 may be such that it does not reach the barrier layer 17 or reaches the barrier layer 17. Further, when the barrier layer 17 is reached, a part of the barrier layer 17 may be broken through, or the barrier layer 17 may not be broken through.
[0039]
When the air bag grid portion 2 is molded in the first embodiment, as shown in FIGS. 2 and 6, the skin material 10 is set on the mold 8, the mold 8 is clamped, and the mold space 9 is set. The core resin 12 is injected to the back surface side of the skin material 10 in FIG. Then, immediately after the start of injection of the core material resin 12, the notch processing jig 22 is inserted into the back surface side of the skin material 10. After the filling of the core material resin 12 is completed, pressure is maintained so that the core material resin 12 is spread in the mold space 9. Then, when the pressure holding state is cut, the notching jig 22 is pulled out of the core resin 12. Thereafter, the core resin 12 is cooled and cured. When the core resin 12 is cured, the mold is opened and the molded product is released. Thereafter, the above is repeated.
[0040]
Through the above steps, the air bag grid portion 2 as shown in FIG. 4A is manufactured. On the other hand, when the notching jig 22 is pulled out after the core resin 12 is cured, the air bag grid portion 2 as shown in FIG. 4A is manufactured.
[0041]
According to the first embodiment, an elastically deformable skin material 10 is set in the mold space 9 of the mold 8, and the core resin 12 is injected and filled on the back surface side of the skin material 10 to mold the airbag grid portion 2. At the same time, by using the notch processing jig 22 that can be inserted into and extracted from the mold space 9 to form the partial thinned portion 21 in the airbag grid portion 2, the quality of the skin material 10 that can be elastically deformed is high. The air bag grid portion 2 can be molded in a state in which the thinned portion 21 such as the cleavage line 3 is included. Thereby, it is not necessary to separately form the thinned portion 21 such as the tear line 3 after the air bag grid portion 2 is molded, and the manufacturing cost of the air grid portion 2 can be reduced.
[0042]
At this time, by inserting / extracting the notch processing jig 22 before the core material resin 12 is cured, the high-quality air bag grid portion 2 having the elastically deformable skin material 10 is formed as the cleavage line 3 or the like. Good molding can be performed in a state in which the thin wall processed portion 21 is contained.
[0043]
That is, if the notch processing jig 22 is inserted before the core resin 12 is completely filled, as shown in FIG. As a result, the pressure of the core material resin 12 is increased, and the skin material 10 that can be elastically deformed is partially compressed by this pressure. In this way, the skin material 10 is partially compressed, so that the flow reduction of the core material resin 12 is improved and molding defects are prevented.
[0044]
Then, when the notching jig 22 is pulled out from the mold space 9 when the pressure holding state of the core resin 12 is cut, the core resin 12 is not yet cured, and as shown in FIG. In addition, the notched portion (thin wall portion 21) is crushed from the imaginary line state to the solid line state by the restoring force of the compressed skin material 10 and the residual stress inside the core resin 12. As a result, the restoring force of the skin material 10 and the residual stress inside the core resin 12 are alleviated and eliminated. Therefore, as shown in FIG. 4B, the portion compressed by the notch processing jig 22 of the skin material 10 is prevented from bulging after the mold release, and a good air bag grid portion 2 can be obtained.
[0045]
Further, when the notching jig 22 is removed, a portion of the core resin 12 that is in contact with the notching jig 22 is cooled and hardened to form a resin film 35 on the surface of the notching portion. Therefore, even if the notched portion is crushed, the resin coatings 35 are not fused together, and the thinned portion 21 such as the cleavage line 3 remains.
[0046]
And since the intensity | strength of this part is improved when a notch process part is crushed, the feeling of stickiness of the airbag grid part 2 is reduced.
[0047]
At this time, by inserting the notch processing jig 22 into the back surface side of the skin material 10, the thin processed portion 21 such as the cleavage line 3 is obtained at the notch processing portion on the back surface side of the airbag grid portion 2.
[0048]
[Modification]
FIG. 9 shows a modification of the first embodiment of the present invention, and shows a case where a skin material 10 in which a character line 40 is preformed on the surface side is used.
[0049]
Even if it does in this way, the effect similar to Embodiment 1 can be acquired. In addition, the airbag grid part 2 provided with the cleavage line 3 and the character line 40 can be manufactured.
[0050]
As another modification of the first embodiment of the present invention, although not shown in particular, the notch processing jig 22 is inserted into the back surface side of the skin material 10 so that the airbag body on the back surface side of the airbag grid portion 2 is A thin processed portion 21 such as a door hinge may be formed at the root portion of the bulge opening.
[0051]
Embodiment 2 of the Invention
FIG. 10 shows a second embodiment of the present invention. Note that portions that are the same as or equivalent to those in the first embodiment will be described with the same reference numerals.
[0052]
In the second embodiment, the notch processing jig 22 is inserted after the core resin 12 is filled, and the notch processing jig 22 is pulled out after the core resin 12 is filled and the core resin. This is performed when the 12 holding pressure state has expired.
[0053]
Even if it does in this way, the effect similar to the said Embodiment 1 can be acquired. Other parts are the same as those in the first embodiment.
[0054]
Embodiment 3 of the Invention
FIG. 11 shows a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected and demonstrated about the part thru | or equivalent to Embodiment 1,2.
[0055]
In the third embodiment, another notch processing jig 47 is inserted from the surface side of the skin material 10 in the same manner as in the first and second embodiments, so that the character line ( Alternatively, the thin skin portion 40) is formed partially or entirely on the thin processed portion 21.
[0056]
By doing in this way, the character line (or thin skin part) 40 can be partially or entirely formed on the thin-wall processed part 21 on the surface side of the airbag grid part 2. This character line (or thin skin portion) 40 is fused in the same manner as in the first and second embodiments since the other notching jig 47 is pulled out when the core resin 12 is not yet cured. The remaining portion is crushed and inconspicuous, so that the air bag grid portion 2 with good surface quality can be obtained.
[0057]
In this case, by inserting another notch processing jig 47 from the surface side of the skin material 10 in the mold 8 that forms the thin wall processed portion 21, the character line (or The thin skin portion 40) may be formed partially or entirely on the thin processed portion 21.
[0058]
In this way, the character line (or skin thin-walled portion) 40 is partially or entirely with respect to the thin-wall processed portion 21 by using the mold 8 that forms the thin-wall processed portion 21. Can be formed.
[0059]
Note that the cleavage line 3 may be processed by forming the ridge 45 on the core mold 7 as shown in FIG. 11 or may be processed by the notch processing jig 22 as in the first and second embodiments. Good.
[0060]
Other parts are the same as those in the first embodiment.
[0061]
【The invention's effect】
As described above, according to the invention of claim 1 or 2, a high-quality air bag grid portion having a skin material that can be compressed / restored by elastic deformation is inserted into a thin-walled processing portion such as a cleavage line. It becomes possible to mold.
[0062]
According to the first or second aspect of the present invention, a high quality air bag grid portion having a skin material that can be elastically deformed is opened by causing the notch processing jig to be inserted and extracted before the core resin is cured. It becomes possible to mold well in a state where a thin-wall processed portion such as a wire is included.
[0063]
According to the first aspect of the present invention, after the filling of the core material resin is completed and when the pressure holding state of the core material resin is cut, the notch processing jig is removed from the mold space, whereby the notch attached with the notch processing jig. The processed part is crushed by the restoring force of the skin material and the residual stress inside the core resin while the core resin is cured, so that the restoring force of the skin material and the residual stress inside the core resin are alleviated and eliminated. The Rukoto. Therefore, the portion compressed by the notch processing jig of the skin material is prevented from expanding after being released from the mold, and a good airbag grid portion can be obtained. Also, when the notching jig is removed, the resin film is formed on the surface by cooling and hardening the portion of the core resin that was in contact with the notching jig, so that the notched portion is crushed. However, the resin coatings are not fused with each other, and the thin processed portion is left. And since the intensity | strength of this part is improved when a notch process part is crushed, the feeling of stickiness of an air bag grid part is reduced.
[0064]
According to the invention of claim 2 , the same effect as that of claim 1 can be obtained.
[0065]
According to the invention of claim 3, a tear line can be obtained on the back surface side of the air bag grid portion.
[0066]
According to the invention of claim 4 , the character line or the thin skin portion can be partially or entirely formed on the surface side of the airbag grid portion with respect to the thin processed portion.
[0067]
According to the invention of claim 5 , the character line or the thin skin portion is formed partially or entirely on the thin-wall processed portion on the surface side of the airbag grid portion using the mold for forming the thin-wall processed portion. Can produce a practically beneficial effect.
[Brief description of the drawings]
FIG. 1 is a perspective view of an instrument panel according to a first embodiment of the present invention.
FIG. 2 is a side cross-sectional view of a mold for forming an air bag grid portion.
3 is a cross-sectional view taken along line III-III in FIG.
4A is a partial side cross-sectional view of the air bag grid portion according to the first embodiment, and FIG. 4B is a partial side cross sectional view of the air bag grid portion when the notching jig is pulled out after the core resin is cured. FIG.
FIG. 5 is an enlarged view of a tip portion of a notching jig.
FIG. 6 is a time chart showing one molding cycle of an air bag grid portion.
FIG. 7 is a partial side cross-sectional view of an airbag grid portion showing a state when a notching jig is inserted.
FIG. 8 is a partial side cross-sectional view of an air bag grid portion showing a state when a notching jig is pulled out.
FIG. 9 is a partial side cross-sectional view of an air bag grid portion according to a modification of the first embodiment.
FIG. 10 is a time chart showing one molding cycle of the air bag grid portion according to the second embodiment of the present invention;
FIG. 11 is a partial side sectional view of an air bag grid portion according to a third embodiment of the present invention;
[Explanation of symbols]
2 Airbag grid part 3 Cleavage line 8 Mold 9 Mold space 10 Skin material 12 Core resin 21 Thin wall processing part 22 Notch processing jig 40 Character line 47 Other notch processing jig

Claims (5)

When setting the skin material that can be compressed and restored by elastic deformation in the mold space of the molding die, and molding the air bag grid portion by injection filling the core material resin on the back side of the skin material,
Using a notch processing jig that can be inserted into and extracted from the mold space to form a partially thinned portion in the airbag grid portion,
The insertion / extraction operation of the notch processing jig into the mold space is performed before the core resin is cured in the mold, and in particular,
The insertion operation of the notching tool I line before completing the filling of the core material resin, to increase the pressure of the core resin of a portion notching tool is protruded, the skin material partially at this pressure Compress to improve the core resin flow drop,
The pulling operation of the notching jig is performed after completion of filling of the core material resin and immediately before cooling after the pressure holding state of the core resin is cut off, and the restoring force and core of the partially compressed skin material A method for manufacturing an air bag grid part, wherein the notched part is crushed in a state where the thin-walled part remains without being fused by residual stress inside the material resin . When setting the skin material that can be compressed and restored by elastic deformation in the mold space of the molding die, and molding the air bag grid portion by injection filling the core material resin on the back side of the skin material,
Using a notch processing jig that can be inserted into and extracted from the mold space to form a partially thinned portion in the airbag grid portion,
The insertion / extraction operation of the notch processing jig into the mold space is performed before the core resin is cured in the mold, and in particular,
What line insertion operation of the notching tool after completion filling of the core material resin, to increase the pressure of the core resin of a portion notching tool is protruded, the skin material partially compressed at this pressure Let
The pulling operation of the notching jig is performed after completion of filling of the core material resin and immediately before cooling after the pressure holding state of the core resin is cut off, and the restoring force and core of the partially compressed skin material A method for manufacturing an air bag grid part, wherein the notched part is crushed in a state where the thin-walled part remains without being fused by residual stress inside the material resin .   3. A manufacturing method for an air bag grid part according to claim 1 or 2, wherein the notch processing jig is inserted into the back side of the skin material to form a tear line on the back side of the air bag grid part. Method.   By inserting another notch processing jig from the surface side of the skin material, a character line or a thin skin portion is partially or entirely formed on the surface side of the airbag grid portion with respect to the thin wall processing portion. The manufacturing method of the air bag grid part of Claim 1 or 2 characterized by these.   By inserting another notch processing jig from the surface side of the skin material in the mold for forming the thin wall processing portion, the character line or the thin skin portion is formed on the surface side of the airbag grid portion. The method according to claim 1, wherein the airbag grid part is formed partially or entirely.

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