JPH10119692A - Skin material slash molding die and method of slash molding for air bag built-in instrument panel - Google Patents
Skin material slash molding die and method of slash molding for air bag built-in instrument panelInfo
- Publication number
- JPH10119692A JPH10119692A JP8278057A JP27805796A JPH10119692A JP H10119692 A JPH10119692 A JP H10119692A JP 8278057 A JP8278057 A JP 8278057A JP 27805796 A JP27805796 A JP 27805796A JP H10119692 A JPH10119692 A JP H10119692A
- Authority
- JP
- Japan
- Prior art keywords
- skin material
- instrument panel
- airbag
- mold body
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 77
- 238000000465 moulding Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011162 core material Substances 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005323 electroforming Methods 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Air Bags (AREA)
- Instrument Panels (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として自動車用
のインストルメントパネルに代表されるように、エアバ
ッグを内装するインストルメントパネルの表皮材を成形
する場合に用いられる金型で、詳しくは、金型本体を加
熱し、その加熱された金型本体の表面に樹脂パウダーを
付着させて溶融硬化させることによりインストルメント
パネルの表皮材を成形するエアバッグ内装インストルメ
ントパネル用表皮材のスラッシュ成形金型及びそのスラ
ッシュ成形方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold used for molding a skin material of an instrument panel in which an airbag is installed, as typified by an instrument panel for an automobile. Heating the mold body, applying resin powder to the surface of the heated mold body, and melting and curing the mold body to form the skin material of the instrument panel. The present invention relates to a mold and a slush molding method thereof.
【０００２】[0002]
【従来の技術】この種のスラッシュ成形方法としては、
図５に示すように、ニッケル製金型本体（電鋳型と通称
される）２１を、該金型本体２１の裏面に接触配置され
た加熱用配管２０に加熱オイルなどの加熱流体を流通さ
せることにより加熱する配管加熱法（モジュラー法）
と、金型本体２１を２５０〜３００℃に加熱されたオー
ブン内に入れて加熱するオーブン法（図示省略する）と
があるが、これら成形方法に用いる金型本体２１とし
て、従来一般には、その全域に亘って均一な型厚ｔ１に
形成したものが使用されていた。このように型厚ｔ１が
全域に亘って均一な金型本体２１からなるスラッシュ成
形金型を用いる場合は、加熱用配管２０内を流通する加
熱オイルなどの加熱流体、あるいは、オーブンを介して
金型本体２１を所定の温度にまで加熱したときの該金型
本体２１の表面温度が全域に亘ってほぼ均一に分布する
ために、その加熱された表面の全域に塩化ビニル系樹脂
や熱可塑性エラストマーを主成分とする樹脂パウダーを
付着させ溶融硬化させて表皮材２２をスラッシュ成形す
る際の熱容量もほぼ均等となって、成形された表皮材２
２の厚さが全域に亘って均一となり、このような均一な
厚さの表皮材２２はエアバッグ内装インストルメントパ
ネルの表皮材として使用することができない。2. Description of the Related Art This type of slush molding method includes:
As shown in FIG. 5, a heating fluid such as heating oil is passed through a nickel mold body (commonly referred to as an electroforming mold) 21 through a heating pipe 20 arranged in contact with the back surface of the mold body 21. Heating method (modular method)
And an oven method (not shown) in which the mold body 21 is placed in an oven heated to 250 to 300 ° C. and heated (not shown). A mold formed with a uniform mold thickness t1 over the entire area was used. When a slush molding die having the mold body 21 having a uniform thickness t1 over the entire region is used, a heating fluid such as a heating oil flowing through the heating pipe 20 or a metal through an oven is used. Since the surface temperature of the mold body 21 when the mold body 21 is heated to a predetermined temperature is substantially uniformly distributed over the entire area, a vinyl chloride resin or a thermoplastic elastomer is provided over the entire heated surface. The heat capacity when slush molding the skin material 22 by adhering and melting and curing a resin powder mainly comprising
2 becomes uniform over the entire area, and the skin material 22 having such a uniform thickness cannot be used as the skin material of the airbag interior instrument panel.
【０００３】すなわち、エアバッグ内装インストルメン
トパネルにおいては、エアバッグの展開に伴って瞬時に
一定箇所で破断し、かつ、その破断が一直線状に急速に
進行することが強く要望されるものであって、上述のよ
うに、全域に亘って厚さが均一な表皮材を有するインス
トルメントパネルでは、破断箇所も破断の進行方向も定
まらないために、上記の要望に応えることができない。[0003] That is, it is strongly desired that an instrument panel inside an airbag breaks at a certain point instantaneously with the deployment of the airbag, and that the breakage rapidly progresses in a straight line. As described above, an instrument panel having a skin material having a uniform thickness over the entire area cannot meet the above-mentioned demand because neither the fractured portion nor the direction in which the fracture proceeds is determined.
【０００４】その対策として、従来では、図５に示すよ
うな配管加熱法のスラッシュ成形金型あるいはオーブン
法のスラッシュ成形金型を用いて、全域に亘って均一な
厚さにスラッシュ成形した表皮材の所定箇所に専用の治
具を用いて溝付けするなどして、エアバッグの展開部に
対応する箇所の厚さを局所的に薄くする手段が採用され
ていた。Conventionally, as a countermeasure, a skin material which has been slush-molded to a uniform thickness over the entire area using a slush molding mold of a pipe heating method or a slush molding mold of an oven method as shown in FIG. For example, means for locally reducing the thickness of a portion corresponding to the deployed portion of the airbag by, for example, forming a groove at a predetermined portion using a dedicated jig has been adopted.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
たように、一旦、スラッシュ成形した後の表皮材に溝付
けなどの薄肉化加工を施すとなると、それだけ表皮材
（製品）の製作工程が多くなって製作コストが上昇する
だけでなく、専用の治具を用いるとしても、製品毎の精
度にばらつきを発生しやすく、表皮材全体としての必要
強度が確保できなかったり、エアバッグの展開に伴う破
断挙動が不安定になる可能性があった。However, as described above, once the slash-molded skin material is subjected to a thinning process such as grooving, the number of manufacturing steps of the skin material (product) increases accordingly. Not only does the production cost increase, but even if a special jig is used, the accuracy of each product tends to vary, and the strength required for the entire skin material cannot be secured, or breakage due to the deployment of the airbag Behavior could be unstable.
【０００６】本発明は上記のような実情に鑑みてなされ
たもので、表皮材のスラッシュ成形時にエアバッグの展
開部に対応する箇所に破断特性に優れた薄肉部を精度よ
く形成させることができるエアバッグ内装インストルメ
ントパネル用表皮材のスラッシュ成形金型およびスラッ
シュ成形方法を提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to accurately form a thin portion having excellent breaking characteristics at a location corresponding to a deployed portion of an airbag during slush molding of a skin material. An object of the present invention is to provide a slush molding die and a slush molding method for a skin material for an instrument panel for an airbag interior.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、請求項１に記載の発明に係るエアバッグ内装インス
トルメントパネル用表皮材のスラッシュ成形金型は、所
定の温度にまで加熱された金型本体の表面に樹脂パウダ
ーを付着させて溶融硬化させることによりエアバッグを
内装するインストルメントパネルの表皮材を成形するス
ラッシュ成形金型であって、スラッシュ成形される上記
表皮材におけるエアバッグの展開部に対応する箇所の金
型本体にその裏面側から表面側に向けて凹んだ凹部を形
成して該凹部の形成された部分の型厚を、その周辺部分
の型厚よりも薄く構成していることを特徴とするもので
ある。In order to achieve the above object, a slush molding die for a skin material for an instrument panel for an airbag interior according to the present invention is heated to a predetermined temperature. A slush molding mold for molding a skin material of an instrument panel that houses an airbag by applying a resin powder to a surface of a mold body and melting and curing the resin material. A concave portion is formed in the mold body at a position corresponding to the unfolded portion from the back side to the front side, and the mold thickness of the portion where the concave portion is formed is smaller than the mold thickness of the peripheral portion. It is characterized by having.
【０００８】上記のような構成の請求項１に記載の発明
によれば、スラッシュ成形前に金型本体を所定の温度ま
で加熱した場合、該金型本体の表面温度が裏面側に凹部
の形成された型厚の薄い部分とその周辺部分とで偏差を
生じることになり、このような表面温度に偏差のある状
態で、金型本体の表面全域に樹脂パウダーを付着させる
と、型厚の薄い表面部分の熱容量がその周辺の表面部分
の熱容量よりも小さくなって、型厚の薄い表面部分に付
着された樹脂パウダーの溶融が抑制され、その結果、エ
アバッグの展開部に対応する箇所の厚さがその周辺部の
厚さよりも局所的に薄くて、エアバッグの展開時に応力
集中によって瞬時に破断され、かつ、その破断が一直線
状に急速に進行するといった優れた破断特性を有する薄
肉部をインストルメントパネルの表皮材のスラッシュ成
形時に一挙に精度よく形成することが可能となり、これ
によって、表皮材のスラッシュ成形後に専用治具による
溝付けなどの薄肉化加工が不要で、表皮材の成形コスト
の低減が図れるとともに、薄肉部の厚さのばらつきも非
常に少なくて必要強度を保ちつつ、エアバッグの展開に
伴う破断挙動を安定のよいものとすることができる。According to the first aspect of the present invention, when the mold main body is heated to a predetermined temperature before the slush molding, the surface temperature of the mold main body forms a concave portion on the back surface side. Deviation occurs between the thin part of the mold and its peripheral part, and when resin powder is adhered to the entire surface of the mold body in a state where there is a deviation in the surface temperature, the mold becomes thin. The heat capacity of the surface portion becomes smaller than the heat capacity of the peripheral surface portion, and the melting of the resin powder attached to the thin surface portion is suppressed, and as a result, the thickness of the portion corresponding to the deployment portion of the airbag is reduced. Is thinner locally than the thickness of its peripheral portion, and is instantaneously broken due to stress concentration when the airbag is deployed, and the thin portion has excellent breaking characteristics such that the breaking progresses rapidly in a straight line. Instrument This makes it possible to form the skin of the front panel in a single step with high precision during slush molding, which eliminates the need for thinning such as grooving with a special jig after the slush molding of the skin, and reduces the cost of molding the skin In addition, the thickness variation of the thin portion is very small, and the required strength can be maintained, and the breaking behavior accompanying the deployment of the airbag can be made stable.
【０００９】上記請求項１に記載の発明に係るエアバッ
グ内装インストルメントパネル用表皮材のスラッシュ成
形金型において、上記金型本体の加熱手段としては、請
求項２に記載したように、該金型本体を所定温度に加熱
されたオーブンに入れて加熱するもの、あるいは、請求
項３に記載したように、該金型本体の裏面に接触配置さ
れた加熱流体流通用配管に加熱オイルなどの加熱流体を
流通させて加熱するもののいずれであってもよい。In the slash molding die for a skin material for an airbag interior instrument panel according to the present invention, the means for heating the die body may be, as described in claim 2, as Heating the mold body by placing it in an oven heated to a predetermined temperature, or heating the heating fluid or the like to a heating fluid distribution pipe arranged in contact with the back surface of the mold body as described in claim 3. Any of those that heat by flowing a fluid may be used.
【００１０】また、上記請求項１ないし３のいずれかに
記載の発明に係るエアバッグ内装インストルメントパネ
ル用表皮材のスラッシュ成形金型において、請求項４に
記載したように、上記金型本体はニッケル製とし、か
つ、上記表皮材のスラッシュ成形用樹脂パウダーとして
塩化ビニル系樹脂を主成分とするものを用いることによ
り、表皮材の外観性能を高めるとともに、温度依存性を
改善して広い温度範囲でエアバッグの展開に伴う破断挙
動の安定化を図ることができる。Further, in the slash molding die for a skin material for an instrument panel for an airbag interior according to the invention according to any one of claims 1 to 3, as described in claim 4, the die body is By using a nickel-based resin and a resin containing a vinyl chloride resin as the main component as the resin powder for slush molding of the skin material, the appearance performance of the skin material is improved, and the temperature dependency is improved to cover a wide temperature range. Thus, the breaking behavior associated with the deployment of the airbag can be stabilized.
【００１１】また、上記請求項１ないし３のいずれかに
記載の発明に係るエアバッグ内装インストルメントパネ
ル用表皮材のスラッシュ成形金型において、請求項５に
記載したように、上記金型本体はニッケル製とし、か
つ、上記表皮材のスラッシュ成形用樹脂パウダーとして
熱可塑性エラストマーを主成分とするものを用いること
によって、軽量性およびクリーン性に優れた表皮材を得
ることができる。なお、この熱可塑性エラストマーとし
ては、オレフィン系熱可塑性エラストマーまたはスチレ
ン系熱可塑性エラストマーのいずれであってもよい。Further, in the slush molding die for a skin material for an airbag interior instrument panel according to the invention according to any one of claims 1 to 3, as described in claim 5, the die body is By using a material made of nickel and having a thermoplastic elastomer as a main component as the resin powder for slush molding of the skin material, a skin material excellent in lightness and cleanness can be obtained. The thermoplastic elastomer may be either an olefin-based thermoplastic elastomer or a styrene-based thermoplastic elastomer.
【００１２】また、上記請求項１ないし５に記載の発明
に係るエアバッグ内装インストルメントパネル用表皮材
のスラッシュ成形金型において、上記凹部の形成された
部分の型厚は、表皮材の全体強度およびエアバッグの展
開に伴う破断挙動の両面から考慮して、請求項６に記載
したように、周辺部分の型厚の７０％未満に設定するこ
とが望ましい。この凹部の形成された部分の型厚をその
周辺部分の型厚の７０％以上に設定すると、エアバッグ
の展開部に対応する箇所の厚みが大きくなって、エアバ
ッグの展開に伴う破断を均一化しにくくなる。In the slush molding die for a skin material for an airbag interior instrument panel according to the first to fifth aspects of the present invention, the thickness of the portion where the recess is formed is determined by the overall strength of the skin material. In view of both aspects of the rupture behavior associated with the deployment of the airbag, it is desirable to set the thickness to less than 70% of the mold thickness of the peripheral portion. When the mold thickness of the portion where the concave portion is formed is set to 70% or more of the mold thickness of the peripheral portion, the thickness of the portion corresponding to the deployed portion of the airbag becomes large, and the breakage accompanying the deployment of the airbag becomes uniform. Less likely to occur.
【００１３】さらに、請求項７に記載の発明に係るエア
バッグ内装インストルメントパネル用表皮材のスラッシ
ュ成形方法は、所定の温度にまで加熱された金型本体の
表面に樹脂パウダーを付着させて溶融硬化させることに
よりエアバッグを内装するインストルメントパネルの表
皮材を成形するエアバッグ内装インストルメントパネル
用表皮材のスラッシュ成形方法であって、スラッシュ成
形される上記表皮材におけるエアバッグの展開部に対応
する箇所の金型本体にその裏面側から表面側に向けて凹
み、その周辺部分の型厚よりも小さい型厚部分を作る凹
部が形成されており、上記金型本体を上記所定の温度に
まで加熱した後、上記金型本体の表面全域に樹脂パウダ
ーを付着させることにより、上記凹部に対応する表面部
分の熱容量を上記凹部の周辺部分の熱容量よりも小さく
して該表面部分に付着された樹脂パウダーの溶融を抑制
してエアバッグの展開部に対応する箇所の厚さが局所的
に薄いインストルメントパネルの表皮材を成形すること
を特徴とするものであり、このような成形方法の採用に
よって、加熱温度のコントロールなど非常に難しい制御
技術を駆使しなくても、通常一般的なスラッシュ成形工
程をもって、必要強度を保ちつつ、エアバッグの展開に
伴う破断挙動の安定性に優れたエアバッグ内装インスト
ルメントパネル用表皮材を精度よく成形することができ
る。Further, in the slash molding method for a skin material for an instrument panel for an airbag interior according to the present invention, a resin powder is adhered to a surface of a mold body heated to a predetermined temperature and melted. A slash molding method for a skin material for an airbag interior instrument panel that forms a skin material for an instrument panel that houses an airbag by curing, and corresponds to a deployment portion of the airbag in the skin material that is slush-molded. A concave portion is formed in the mold body at a position to be recessed from the back surface side to the front surface side to form a mold thickness portion smaller than the mold thickness of the peripheral portion, and the mold body is brought to the predetermined temperature. After heating, by adhering resin powder to the entire surface of the mold body, the heat capacity of the surface portion corresponding to the concave portion is reduced. The heat capacity of the peripheral portion of the portion is made smaller, the melting of the resin powder attached to the surface portion is suppressed, and the thickness of the portion corresponding to the deployed portion of the airbag is locally reduced, and the skin material of the instrument panel is thinned. It is characterized by molding, and by adopting such a molding method, it is possible to maintain the required strength by a general slush molding process without using very difficult control technology such as heating temperature control. In addition, it is possible to accurately form a skin material for an instrument panel for an airbag interior instrument panel, which is excellent in stability of a breaking behavior accompanying deployment of the airbag.
【００１４】上記請求項７に記載の発明に係るエアバッ
グ内装インストルメントパネル用表皮材のスラッシュ成
形方法において、上記金型本体の加熱手段としては、請
求項８に記載したように、該金型本体を所定温度に加熱
されたオーブンに入れて加熱する手段、あるいは、請求
項９に記載したように、該金型本体の裏面に接触配置さ
れた加熱流体流通用配管に加熱オイルなどの加熱流体を
流通させて加熱する手段のいずれを使用してもよい。In the slush molding method for a skin material for an instrument panel for an airbag interior according to the present invention, the means for heating the mold body may be a mold as described in claim 8. A means for heating the body by placing the body in an oven heated to a predetermined temperature, or, as described in claim 9, a heating fluid such as a heating oil in a heating fluid circulation pipe arranged in contact with the back surface of the mold body. And any means for heating while flowing.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態を図面
にもとづいて説明する。図１は本発明に係るエアバッグ
内装インストルメントパネル用表皮材のスラッシュ成形
方法のうち配管加熱法（モジュラー法）に適用される金
型の要部の断面構造図であり、同図において、２は電鋳
型と通称されるニッケル製金型本体で、その裏面２ｂに
は加熱オイルなどの加熱流体が流通する加熱用配管１が
等間隔に配置されている。この金型本体２の裏面２ｂ
で、スラッシュ成形されるエアバッグ内装インストルメ
ントパネル用表皮材（後述する）におけるエアバッグの
展開部に対応する箇所には、その展開部の形状に合致す
る形状、例えばＨ型やＵ型、ダブルＹ型などの形状をも
ち、金型本体２の表面２ａ側に向けて凹んだ凹部４が形
成されている。この凹部４は、図２に明示するように、
該凹部４の形成された薄肉部分２Ａの型厚ｔがその周辺
部分２Ｂの型厚Ｔの７０％未満に設定されるような深さ
で形成されている。具体的には、周辺部分２Ｂの型厚Ｔ
が５ｍｍの場合、凹部４の形成された薄肉部分２Ａの型
厚ｔは３ｍｍ以下、かつ、凹部４の入口部幅ｗは１０〜
２０ｍｍ程度に設定されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional structural view of a main part of a mold applied to a pipe heating method (modular method) in a slush molding method for a skin material for an airbag interior instrument panel according to the present invention. Is a nickel mold main body commonly referred to as an electroforming mold, and heating pipes 1 through which a heating fluid such as heating oil flows are arranged at equal intervals on the back surface 2b. Back surface 2b of this mold body 2
In a slash-molded skin material for an airbag interior instrument panel (described later), a portion corresponding to the deployed portion of the airbag has a shape that matches the shape of the deployed portion, for example, an H shape, a U shape, or a double shape. A concave portion 4 having a shape such as a Y shape and concave toward the surface 2a of the mold body 2 is formed. As shown in FIG.
The thickness t of the thin portion 2A where the concave portion 4 is formed is set to a depth such that it is set to be less than 70% of the thickness T of the peripheral portion 2B. Specifically, the mold thickness T of the peripheral portion 2B
Is 5 mm, the mold thickness t of the thin portion 2A in which the concave portion 4 is formed is 3 mm or less, and the entrance width w of the concave portion 4 is 10 to 10.
It is set to about 20 mm.
【００１６】次に、上記のようなスラッシュ成形金型を
用いて上記表皮材を成形する方法を説明する。まず、上
記金型本体２を上記加熱用配管１内を流通する加熱オイ
ルなどの加熱流体を介して所定の温度、つまり、２００
〜２２０℃にまで加熱した後、上記金型本体２の表面２
ａの全域に塩化ビニル系樹脂を主成分とし、これに可塑
剤、安定剤、流動化剤などを適量に配合してなる樹脂パ
ウダーを付着させて溶融硬化させる。このとき、上記金
型本体２の表面温度は、裏面側に凹部４の形成された型
厚ｔの小さい薄肉部分２Ａと型厚Ｔの大きい周辺部分２
Ｂとで偏差を生じているために、表面２ａ全域に樹脂パ
ウダーを付着させると、型厚ｔの小さい薄肉部分２Ａの
表面の熱容量が型厚Ｔの大きい周辺部分２Ｂの表面の熱
容量よりも小さくなって、薄肉部分２Ａの表面に付着さ
れた樹脂パウダーの溶融が抑制され、その結果、図１に
示すように、エアバッグの展開部に対応する箇所３ａの
厚さがその周辺部３ｂの厚さよりも局所的に薄いインス
トルメントパネル用表皮材３がスラッシュ成形されるこ
とになる。Next, a method for molding the skin material using the slush molding die as described above will be described. First, the mold body 2 is heated to a predetermined temperature, that is, 200 mm, through a heating fluid such as heating oil flowing through the heating pipe 1.
After heating to about 220 ° C., the surface 2
A resin powder containing a vinyl chloride-based resin as a main component, a plasticizer, a stabilizer, a fluidizing agent, and the like in an appropriate amount is adhered to the entire area of a and melt-cured. At this time, the surface temperature of the mold body 2 is reduced to a thin portion 2A having a small mold thickness t and a peripheral portion 2 having a large mold thickness T in which a concave portion 4 is formed on the back surface side.
Since resin powder adheres to the entire surface 2a due to the deviation from B, the heat capacity of the surface of the thin portion 2A having a small mold thickness t is smaller than the heat capacity of the surface of the peripheral portion 2B having a large mold thickness T. As a result, the melting of the resin powder attached to the surface of the thin portion 2A is suppressed. As a result, as shown in FIG. 1, the thickness of the portion 3a corresponding to the deployed portion of the airbag is reduced by the thickness of the peripheral portion 3b. The instrument panel skin material 3 that is thinner locally than that is formed by slash molding.
【００１７】上記のように成形された表皮材３は、図３
に示すように、樹脂板や複合樹脂板などの所要形状の芯
材５と一体に発泡成形されるもので、芯材５の表面に積
層されるポリウレタンフォームなどのパッド材６の外周
に被覆されるものであって、これら芯材５、パッド材６
および表皮材３により構成される自動車用のインストル
メントパネル７の所定箇所にエアバッグ８が内装され
る。このエアバッグ８の内装された後のインストルメン
トパネル７の要部断面構造は、図４に明示するように、
上記表皮材３の薄肉部分３ａが上記エアバッグ８の展開
部に対応しているとともに、上記パッド材６における上
記エアバッグ展開部に対応する部分６ａの厚みも薄く形
成されており、したがって、自動車の衝突に伴ってエア
バッグ８が展開したとき、その展開部に対向するパッド
材６の薄肉部分６ａおよび表皮材３の薄肉部分３ａに応
力が集中して、それら部分６ａ，３ａの一部が瞬時に破
断されるとともに、その破断がＨ型などの所定形状に形
成されている薄肉部分６ａ，３ａに沿って直線的に急速
に進行し、エアバッグ８による衝撃吸収機能が確実に発
揮されることになる。The skin material 3 formed as described above is shown in FIG.
As shown in the figure, the foam is molded integrally with a core material 5 having a required shape such as a resin plate or a composite resin plate, and is coated on the outer periphery of a pad material 6 such as a polyurethane foam laminated on the surface of the core material 5. The core material 5 and the pad material 6
In addition, an airbag 8 is provided at a predetermined position on an instrument panel 7 for a vehicle constituted by the skin material 3. The cross-sectional structure of the main part of the instrument panel 7 after the interior of the airbag 8 is provided, as clearly shown in FIG.
The thin portion 3a of the skin material 3 corresponds to the deployment portion of the airbag 8, and the portion 6a of the pad material 6 corresponding to the deployment portion of the airbag is formed to be thin. When the airbag 8 is deployed with the collision of the airbag, stress concentrates on the thin portion 6a of the pad material 6 and the thin portion 3a of the skin material 3 facing the deployed portion, and a part of the portions 6a, 3a While being instantaneously broken, the breakage proceeds linearly and rapidly along the thin portions 6a, 3a formed in a predetermined shape such as an H-shape, and the shock absorbing function of the airbag 8 is reliably exhibited. Will be.
【００１８】なお、上記実施の形態では、配管加熱法
（モジュラー法）によるエアバッグ内装インストルメン
トパネル用表皮材のスラッシュ成形金型およびスラッシ
ュ成形方法について説明したが、これ以外に、上記金型
本体２を２５０〜３００℃に加熱されたオーブンに入れ
て２００〜２５０℃にまで間接加熱した後に樹脂パウダ
ーを付着させて溶融硬化させるオーブン法によるエアバ
ッグ内装インストルメントパネル用表皮材のスラッシュ
成形方法に適用しても上記実施の形態と同様な効果を奏
する。In the above-described embodiment, the slush molding die and the slush molding method for the skin material for the instrument panel for the airbag interior by the pipe heating method (modular method) have been described. 2 is placed in an oven heated to 250-300 ° C., heated indirectly to 200-250 ° C., and then slush-molded for a skin material for an airbag interior instrument panel by an oven method in which resin powder is adhered and melt-cured. Even when applied, the same effects as in the above embodiment can be obtained.
【００１９】また、スラッシュ成形用樹脂パウダーとし
て、上記実施の形態では、塩化ビニル系樹脂を主成分と
し、これに可塑剤、安定剤、流動化剤などを適量に配合
してなる樹脂パウダーを使用したもので説明したが、こ
れ以外に、オレフィン系熱可塑性エラストマーまたはス
チレン系熱可塑性エラストマーといった熱可塑性エラス
トマーを主成分とする樹脂パウダーを使用してもよく、
この場合は、表皮材の軽量性およびクリーン性を向上す
ることが可能である。In the above embodiment, as the resin powder for slush molding, a resin powder comprising a vinyl chloride resin as a main component and a suitable amount of a plasticizer, a stabilizer, a fluidizing agent and the like is used. However, in addition to this, a resin powder mainly containing a thermoplastic elastomer such as an olefin-based thermoplastic elastomer or a styrene-based thermoplastic elastomer may be used,
In this case, it is possible to improve the lightness and cleanness of the skin material.
【００２０】さらに、上記エアバッグ８を内装する自動
車用のインストルメントパネル７としては、助手席側の
インストルメントパネルであっても、ドア一体のインス
トルメントパネルであってもよい。Further, the instrument panel 7 for a vehicle in which the airbag 8 is provided may be an instrument panel on the passenger side or an instrument panel with a door.
【００２１】[0021]
【発明の効果】以上のように、請求項１〜３および請求
項７〜９に記載の発明によれば、エアバッグの展開部に
対応する箇所の厚さがその周辺部の厚さよりも局所的に
薄くて、エアバッグの展開時に応力集中によって瞬時に
定位置で破断され、かつ、その破断を一直線状に急速に
進行させるといった優れた破断特性を有する薄肉部をイ
ンストルメントパネルの表皮材のスラッシュ成形時に一
挙に精度よく形成することができる。したがって、スラ
ッシュ成形後の表皮材に専用治具を用いて溝付けなどの
薄肉化加工を施すことが全く不要で、表皮材（製品）の
製作工程を少なくして製作コストを低減することができ
るとともに、薄肉部の厚さにばらつきを生じることが非
常に少なく、表皮材全体としての必要強度を十分に保ち
つつ、エアバッグの展開に伴う破断挙動の安定性を向上
することができるという効果を奏する。As described above, according to the first to third and seventh to ninth aspects of the present invention, the thickness of the portion corresponding to the deployed portion of the airbag is more local than the thickness of its peripheral portion. The thin part of the skin material of the instrument panel is a thin part that has excellent rupture characteristics such that it is instantaneously broken at a fixed position due to stress concentration when the airbag is deployed, and the rupture proceeds rapidly in a straight line. It can be formed at once with high precision during slush molding. Therefore, it is not necessary to perform a thinning process such as grooving using a dedicated jig on the skin material after the slash molding, and the manufacturing cost of the skin material (product) can be reduced by reducing the number of manufacturing processes. At the same time, there is very little variation in the thickness of the thin portion, and the effect of improving the stability of the breaking behavior associated with the deployment of the airbag can be improved while maintaining the necessary strength of the entire skin material sufficiently. Play.
【００２２】また、請求項４に記載の発明によれば、上
記の効果に加えて、表皮材の外観性能を高めるととも
に、温度依存性を改善して広い温度範囲でエアバッグの
展開に伴う破断挙動の安定化を図ることができる。According to the fourth aspect of the present invention, in addition to the above-described effects, the appearance performance of the skin material is enhanced, and the temperature dependency is improved, so that the rupture associated with the deployment of the airbag in a wide temperature range. Behavior can be stabilized.
【００２３】また、請求項５に記載の発明によれば、上
記１〜３および請求項７〜９に記載の発明の効果に加え
て、表皮材を含む自動車用インストルメントパネル全体
の軽量化および廃車時の焼却処分に発生する酸性物質に
よる大気汚染や酸性雨等を惹起しないクリーン性の向上
を図ることができる。According to the fifth aspect of the present invention, in addition to the effects of the first to third aspects and the seventh to ninth aspects, the weight of the entire instrument panel for a vehicle including the skin material can be reduced. It is possible to improve cleanliness that does not cause air pollution, acid rain, and the like due to acidic substances generated during incineration disposal of a scrapped vehicle.
【００２４】さらに、請求項６に記載の発明によれば、
上記１〜３および請求項７〜９に記載の発明の効果に加
えて、エアバッグの展開に伴う破断特性を均一化して、
製品歩留まりの向上を図ることができる。Further, according to the invention described in claim 6,
In addition to the effects of the inventions described in the above 1-3 and claims 7-9, the breaking characteristics accompanying the deployment of the airbag are made uniform,
The product yield can be improved.
【図１】本発明に係るエアバッグ内装インストルメント
パネル用表皮材のスラッシュ成形方法のうち配管加熱法
に適用されるスラッシュ成形金型の要部の断面構造図で
ある。FIG. 1 is a sectional structural view of a main part of a slush molding die applied to a pipe heating method in a slush molding method for a skin material for an airbag interior instrument panel according to the present invention.
【図２】図１の要部の拡大図である。FIG. 2 is an enlarged view of a main part of FIG.
【図３】エアバッグが内装された自動車用インストルメ
ントパネルの横断面図である。FIG. 3 is a cross-sectional view of an automobile instrument panel in which an airbag is installed.
【図４】図４のＡ部の拡大断面図である。FIG. 4 is an enlarged sectional view of a portion A in FIG. 4;
【図５】従来のエアバッグ内装インストルメントパネル
用表皮材のスラッシュ成形方法のうち配管加熱法に適用
されるスラッシュ成形金型の要部の断面構造図である。FIG. 5 is a cross-sectional structural view of a main part of a slush molding die applied to a pipe heating method in a conventional slush molding method for a skin material for an airbag interior instrument panel.
１ 加熱用配管 ２ 金型本体 ２Ａ 薄肉部分 ２Ｂ 厚肉部分 ３ 表皮材 ４ 凹部 ７ インストルメントパネル ８ エアバッグ DESCRIPTION OF SYMBOLS 1 Heating pipe 2 Mold main body 2A Thin part 2B Thick part 3 Skin material 4 Concave part 7 Instrument panel 8 Airbag
───────────────────────────────────────────────────── フロントページの続き (72)発明者 尾崎 志郎 大阪府大阪市西区江戸堀１丁目17番18号 東洋ゴム工業株式会社内 (72)発明者 山地 猛 大阪府大阪市西区江戸堀１丁目17番18号 東洋ゴム工業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shiro Ozaki 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. (72) Inventor Takeshi Yamaji 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka No. Toyo Tire & Rubber Co., Ltd.
Claims (9)
表面に樹脂パウダーを付着させて溶融硬化させることに
よりエアバッグを内装するインストルメントパネルの表
皮材を成形するスラッシュ成形金型であって、 スラッシュ成形される上記表皮材におけるエアバッグの
展開部に対応する箇所の金型本体にその裏面側から表面
側に向けて凹んだ凹部を形成して該凹部の形成された部
分の型厚を、その周辺部分の型厚よりも薄く構成してい
ることを特徴とするエアバッグ内装インストルメントパ
ネル用表皮材のスラッシュ成形金型。1. A slush molding die for forming a skin material of an instrument panel in which an airbag is installed by adhering resin powder to a surface of a die body heated to a predetermined temperature and melting and curing the resin powder. In the skin material to be slush-molded, a concave portion is formed in the mold body at a position corresponding to the deployed portion of the airbag from the back side to the front side, and the mold thickness of the portion where the concave portion is formed is formed. A slash molding die for a skin material for an instrument panel for an airbag interior, wherein the slash molding is made thinner than a thickness of a peripheral portion thereof.
を所定温度に加熱されたオーブンに入れて加熱する手段
である請求項１に記載のエアバッグ内装インストルメン
トパネル用表皮材のスラッシュ成形金型。2. The airbag interior instrument panel skin material according to claim 1, wherein the means for heating the mold body is means for heating the mold body by placing the mold body in an oven heated to a predetermined temperature. Slash molding die.
の裏面に接触配置された加熱流体流通用配管である請求
項１に記載のエアバッグ内装インストルメントパネル用
表皮材のスラッシュ成形金型。3. The slush molding of a skin material for an instrument panel inside an airbag according to claim 1, wherein the heating means of the mold body is a piping for flowing a heating fluid, which is disposed in contact with the back surface of the mold body. Mold.
つ、上記表皮材のスラッシュ成形用樹脂パウダーが塩化
ビニル系樹脂を主成分とするものである請求項１ないし
３のいずれかに記載のエアバッグ内装インストルメント
パネル用表皮材のスラッシュ成形金型。4. The method according to claim 1, wherein the mold body is made of nickel, and the resin powder for slush molding of the skin material is mainly composed of a vinyl chloride resin. A slush molding mold for skin material for instrument panels inside airbags.
つ、上記表皮材のスラッシュ成形用樹脂パウダーが熱可
塑性エラストマーを主成分とするものである請求項１な
いし３のいずれかに記載のエアバッグ内装インストルメ
ントパネル用表皮材のスラッシュ成形金型。5. The air according to claim 1, wherein the mold body is made of nickel, and the resin powder for slush molding of the skin material is mainly composed of a thermoplastic elastomer. Slash molding die for skin material for instrument panel for bag interior.
辺部分の型厚の７０％未満に設定されている請求項１な
いし５のいずれかに記載のエアバッグ内装インストルメ
ントパネル用表皮材のスラッシュ成形金型。6. The skin for an airbag interior instrument panel according to claim 1, wherein a mold thickness of a portion where the concave portion is formed is set to be less than 70% of a mold thickness of a peripheral portion. Slush molding die for materials.
表面に樹脂パウダーを付着させて溶融硬化させることに
よりエアバッグを内装するインストルメントパネルの表
皮材を成形するエアバッグ内装インストルメントパネル
用表皮材のスラッシュ成形方法であって、 スラッシュ成形される上記表皮材におけるエアバッグの
展開部に対応する箇所の金型本体にその裏面側から表面
側に向けて凹み、その周辺部分の型厚よりも小さい型厚
部分を作る凹部が形成されており、 上記金型本体を上記所定の温度にまで加熱した後、 上記金型本体の表面全域に樹脂パウダーを付着させるこ
とにより、上記凹部に対応する表面部分の熱容量を上記
凹部の周辺部分の熱容量よりも小さくして該表面部分に
付着された樹脂パウダーの溶融を抑制してエアバッグの
展開部に対応する箇所の厚さが局所的に薄いインストル
メントパネルの表皮材を成形することを特徴とするエア
バッグ内装インストルメントパネル用表皮材のスラッシ
ュ成形方法。7. An airbag interior instrument panel for forming a skin material of an instrument panel in which an airbag is interior by adhering resin powder to the surface of a mold body heated to a predetermined temperature and melting and curing the resin powder. A slush molding method for a skin material for use, wherein the mold body at a portion corresponding to the deployment portion of the airbag in the skin material to be slush molded is dented from the back side to the front side, and the mold thickness of the peripheral portion thereof A concave portion for forming a smaller mold thickness portion is formed. After the mold body is heated to the predetermined temperature, a resin powder is adhered to the entire surface of the mold body to correspond to the concave portion. The heat capacity of the surface portion to be formed is made smaller than the heat capacity of the peripheral portion of the concave portion to suppress the melting of the resin powder attached to the surface portion, and A slash forming method for a skin material for an instrument panel for an airbag interior, wherein a skin material of an instrument panel having a locally thin thickness at a portion corresponding to a deployment portion is formed.
本体を所定温度に加熱されたオーブンに入れて加熱する
手段を使用する請求項７に記載のエアバッグ内装インス
トルメントパネル用表皮材のスラッシュ成形方法。8. The skin material for an instrument panel in an airbag according to claim 7, wherein a means for heating the mold body by placing the mold body in an oven heated to a predetermined temperature is used as the means for heating the mold body. Slush molding method.
本体の裏面に接触配置された加熱用配管内に加熱流体を
流通させて加熱する手段を使用する請求項７に記載のエ
アバッグ内装インストルメントパネル用表皮材のスラッ
シュ成形方法。9. The airbag according to claim 7, wherein the means for heating the mold body uses a means for flowing a heating fluid through a heating pipe arranged in contact with the back surface of the mold body to heat the mold body. A slush molding method for skin materials for interior instrument panels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8278057A JPH10119692A (en) | 1996-10-21 | 1996-10-21 | Skin material slash molding die and method of slash molding for air bag built-in instrument panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8278057A JPH10119692A (en) | 1996-10-21 | 1996-10-21 | Skin material slash molding die and method of slash molding for air bag built-in instrument panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10119692A true JPH10119692A (en) | 1998-05-12 |
Family
ID=17592063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8278057A Pending JPH10119692A (en) | 1996-10-21 | 1996-10-21 | Skin material slash molding die and method of slash molding for air bag built-in instrument panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10119692A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040016293A (en) * | 2002-08-16 | 2004-02-21 | 현대모비스 주식회사 | The making method of deployment line for air bag |
| FR2873054A1 (en) * | 2004-07-15 | 2006-01-20 | Faurecia Interieur Ind Snc | Roto-moulding procedure for skin with weakened section e.g. to release airbag uses mould with contact surface zones that can be regulated to different temperatures |
| JP2014148150A (en) * | 2013-01-10 | 2014-08-21 | Shigeru Co Ltd | Tailored section sickness process and tailored section sickness device |
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|---|---|---|---|---|
| JPH06279642A (en) * | 1993-03-26 | 1994-10-04 | Shin Etsu Chem Co Ltd | Vinyl chloride-based resin composition for powder slash molding |
| JPH06285876A (en) * | 1993-03-31 | 1994-10-11 | Inoac Corp | Manufacture of vehicle interior trim having airbag cover |
| JPH081696A (en) * | 1994-06-23 | 1996-01-09 | Inoac Corp | Method and apparatus for molding skin of instrument panel |
| JPH08230517A (en) * | 1995-02-27 | 1996-09-10 | Toyo Tire & Rubber Co Ltd | Method for molding instrument panel for air bag |
| JPH08258658A (en) * | 1995-03-23 | 1996-10-08 | Inoac Corp | Structure of cabin side member having air bag door and manufacture of cabin side member |
| JPH08295863A (en) * | 1995-03-02 | 1996-11-12 | Sumitomo Chem Co Ltd | Adhesive composition, adhesive molded form therefrom and its production, composite molded form and multilayer molded form each having adhesive layer from the composition and their production |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06279642A (en) * | 1993-03-26 | 1994-10-04 | Shin Etsu Chem Co Ltd | Vinyl chloride-based resin composition for powder slash molding |
| JPH06285876A (en) * | 1993-03-31 | 1994-10-11 | Inoac Corp | Manufacture of vehicle interior trim having airbag cover |
| JPH081696A (en) * | 1994-06-23 | 1996-01-09 | Inoac Corp | Method and apparatus for molding skin of instrument panel |
| JPH08230517A (en) * | 1995-02-27 | 1996-09-10 | Toyo Tire & Rubber Co Ltd | Method for molding instrument panel for air bag |
| JPH08295863A (en) * | 1995-03-02 | 1996-11-12 | Sumitomo Chem Co Ltd | Adhesive composition, adhesive molded form therefrom and its production, composite molded form and multilayer molded form each having adhesive layer from the composition and their production |
| JPH08258658A (en) * | 1995-03-23 | 1996-10-08 | Inoac Corp | Structure of cabin side member having air bag door and manufacture of cabin side member |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040016293A (en) * | 2002-08-16 | 2004-02-21 | 현대모비스 주식회사 | The making method of deployment line for air bag |
| FR2873054A1 (en) * | 2004-07-15 | 2006-01-20 | Faurecia Interieur Ind Snc | Roto-moulding procedure for skin with weakened section e.g. to release airbag uses mould with contact surface zones that can be regulated to different temperatures |
| JP2014148150A (en) * | 2013-01-10 | 2014-08-21 | Shigeru Co Ltd | Tailored section sickness process and tailored section sickness device |
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