JP4582005B2 - Manufacturing method of airbag cover - Google Patents

Manufacturing method of airbag cover Download PDF

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JP4582005B2
JP4582005B2 JP2006007676A JP2006007676A JP4582005B2 JP 4582005 B2 JP4582005 B2 JP 4582005B2 JP 2006007676 A JP2006007676 A JP 2006007676A JP 2006007676 A JP2006007676 A JP 2006007676A JP 4582005 B2 JP4582005 B2 JP 4582005B2
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cutting blade
cutting
airbag
cutter
blade storage
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JP2007186163A (en
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真子 浅井
靖 岡田
隆二 横井
孝幸 伊藤
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Toyoda Gosei Co Ltd
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本発明は、折り畳まれたエアバッグを覆い、かつ、膨張するエアバッグに押されて破断してエアバッグを突出させる突出用開口を形成可能な線状に延びる薄肉の破断予定部を備えて、型成形によって形成される合成樹脂製のエアバッグカバーの製造方法に関する。 The present invention includes a thinly-scheduled breakable portion that extends in a linear shape that covers a folded airbag and that can be pushed by an inflating airbag to break and form a projecting opening that projects the airbag. The present invention relates to a method for manufacturing a synthetic resin airbag cover formed by molding.

従来、合成樹脂製のエアバッグカバーでは、エアバッグに押された際、扉部を開かせて、突出用開口を形成できるように、扉部の周囲に薄肉の破断予定部を形成していた（例えば、特許文献１参照）。この破断予定部は、射出成形されたエアバッグカバーの裏面側に凹溝を設けて構成されており、さらに、寸法精度を高めた深さに加工できるように、超音波カッタ等の加工具の切刃を利用して切れ目を入れる切り込み加工により、形成されていた。   Conventionally, in an air bag cover made of synthetic resin, when the air bag is pushed, a door portion is opened to form a protruding opening, so that a thin breakage planned portion is formed around the door portion. (For example, refer to Patent Document 1). This rupture-scheduled portion is configured by providing a groove on the back side of the injection-molded airbag cover, and further, a processing tool such as an ultrasonic cutter can be processed to a depth with improved dimensional accuracy. It was formed by a slitting process using a cutting blade to make a cut.

さらに、破断予定部の配置としては、一方の直線状部位に対して交差側部位を平面視の状態でＴ字状に交差させるＴ字状交差部を２箇所に配置させて、平面視の形状をＨ字形状とするものがあった（例えば、特許文献２参照）。このような破断予定部では、Ｈ字の横棒部位で分離されるような２枚の扉部をエアバッグカバーに形成し、Ｈ字の両側の縦棒部の対向する両端相互を結ぶ部位を、開き時のヒンジ部として、エアバッグの展開膨張時に、Ｈ字形状に配置された破断予定部を破断させて、２枚の扉部を開かせていた。
特開２００５−２８９２５４号公報 特開２０００−２６４１５９号公報 Furthermore, as arrangement | positioning of a plan part to fracture | rupture, the shape of a planar view is arrange | positioned by arrange | positioning the T-shaped intersection part which cross | intersects an intersection side site | part with respect to one linear site | part in the shape of a plane in two places Has an H-shape (see, for example, Patent Document 2). In such a portion to be broken, two door portions that are separated at the H-shaped horizontal bar portion are formed in the airbag cover, and the portions that connect the opposite ends of the vertical bar portions on both sides of the H-shape are connected to each other. As the hinge portion at the time of opening, when the airbag is deployed and inflated, the planned break portion arranged in an H shape is broken to open the two door portions.
JP 2005-289254 A JP 2000-264159 A

しかし、従来のエアバッグカバーの破断予定部を切り込み加工によって形成してＴ字状交差部を形成する際において、一方の直線状部位に対して、交差側部位を切り込み加工によって形成する際、加工具の切刃が、一方の直線状部位の領域を超えて、エアバッグカバーの部位に切れ目（切れ込み）を入れる虞れがある。このような切れ目は、破断予定部の破断時、交差側部位が直線状部位を越えて破断を延長させてしまう虞れが生じ、さらに、不要な部分を破断させて飛散させる虞れも生ずる。   However, when forming the T-shaped crossing portion by forming the expected breakage portion of the conventional airbag cover by cutting, it is necessary to add the crossover portion to the one straight portion by cutting. There is a possibility that the cutting edge of the tool may make a cut (cut) in the portion of the airbag cover beyond the region of the one linear portion. Such a break may cause the crossing portion to extend beyond the straight portion when the planned breakage portion breaks, and may cause the unnecessary portion to break and scatter.

本発明は、上述の課題を解決するものであり、破断予定部におけるＴ字状交差部の交差側部位を切り込み加工によって形成しても、不要な切れ目の発生を防止して加工できるエアバッグカバーの製造方法を提供することを目的とする。 The present invention solves the above-mentioned problem, and even if the crossing side portion of the T-shaped crossing portion in the planned breaking portion is formed by cutting, an air bag cover that can be processed while preventing generation of unnecessary cuts. It aims at providing the manufacturing method of.

本発明に係るエアバッグカバーの製造方法は、折り畳まれたエアバッグを覆い、かつ、膨張するエアバッグに押されて破断してエアバッグを突出させる突出用開口を形成可能な線状に延びる薄肉の破断予定部を備えて、型成形によって形成される合成樹脂製とし、
破断予定部が、裏面側から表面側に凹む凹溝を設けて形成されるとともに、一方の直線状部位に対して交差側部位を平面視の状態でＴ字状に交差させるＴ字状交差部を備え、さらに、成形後に、加工具を移動させて加工具の切刃により切れ目を入れる切り込み加工によって、形成される部位を備えて構成され、
破断予定部の少なくとも交差側部位が、切り込み加工によって形成される部位としているエアバッグカバーの製造方法であって、
加工具が、カッタから構成されて、
カッタの切刃が、先端から元部側にかけて、切り込み加工時の移動方向に向かって張り出すように、傾斜して形成され、
成形後のＴ字状交差部の部位に、エアバッグカバーの表面側に凹む切刃収納部が配設され、
切刃収納部が、
Ｔ字状交差部に向けて交差側部位を切り込み加工しつつ移動するカッタの切刃を交差側部位から離脱させた際に、交差側部位から直線状部位に向かう方向で対向する位置に配置される切刃収納部の面に対して切れ目を入れない状態として、切刃を収納可能に、
交差側部位側の底面を、交差側部位を切り込み加工するカッタの移動方向と平行な平坦面として、交差側部位から直線状部位に向かう方向で対向する位置に配置されている切刃収納部の面を、交差側部位から離れつつ切刃収納部の底面からも離れる傾斜面として、
形成されていることを特徴とする。 The method for manufacturing an airbag cover according to the present invention includes a thin-walled wire that covers a folded airbag and that can be formed into a protruding opening that is pushed by an inflating airbag and breaks to project the airbag. It is made of a synthetic resin formed by molding,
The T-shaped crossing portion that is formed by providing a groove to be recessed from the back surface side to the front surface side and intersecting the crossing side portion in a T shape in a plan view with respect to one linear portion. In addition, after forming, it is configured to include a portion to be formed by a cutting process in which a processing tool is moved and a cut is made by a cutting blade of the processing tool after molding,
A method for manufacturing an airbag cover , wherein at least the crossing side portion of the portion to be broken is a portion formed by cutting,
The processing tool consists of a cutter,
The cutting edge of the cutter is formed so as to be inclined from the tip to the base side so as to protrude toward the moving direction at the time of cutting,
A cutting blade storage portion that is recessed on the surface side of the airbag cover is disposed at the site of the T-shaped intersection after molding,
The cutting blade storage
When the cutting blade of the cutter that moves while cutting the crossing part toward the T-shaped crossing part is separated from the crossing part, it is arranged at a position facing in the direction from the crossing part to the linear part. The cutting blade can be stored so that there is no cut on the surface of the cutting blade storage section.
The bottom surface of the crossing side portion side is a flat surface parallel to the moving direction of the cutter that cuts the crossing side portion, and the cutting blade storage portion disposed at a position facing in the direction from the crossing side portion toward the linear portion. As an inclined surface that separates the surface from the bottom of the cutting blade storage part while separating from the crossing site,
It is formed.

本発明に係るエアバッグカバーの製造方法では、交差側部位を加工具によって切り込み加工する際、加工具の切刃をＴ字状交差部に向けて移動させて交差側部位を形成する。そして、交差側部位を切り込み加工した加工具の切刃は、Ｔ字状交差部の切刃収納部に到達する。その際、切刃収納部は、加工具の切刃が交差側部位から離脱した際に、交差側部位から直線状部位に向かう方向で対向する位置に配置される切刃収納部の面に対して、切れ目を入れない状態として、切刃を収納可能とする形状に形成されているため、カッタの切刃が、切刃収納部の内周面における交差側部位と対向する面（切刃と対向する面）に切れ目を入れるように接触せず、その対向面に切れ目（切れ込み）を入れることを防止することができて、膨張するエアバッグに押されて生ずる交差側部位の破断が、不必要に直線状部位を越えて進行することを防止できる。 In the method of manufacturing an airbag cover according to the present invention, when the crossing side portion is cut by the processing tool, the cutting edge of the processing tool is moved toward the T-shaped crossing portion to form the crossing side portion. And the cutting edge of the processing tool which cut and processed the crossing side part arrives at the cutting blade storage part of a T-shaped crossing part. At that time, when the cutting blade storage part is detached from the crossing side part, the cutting blade storage part is opposed to the surface of the cutting blade storage part arranged at a position facing the linear part from the crossing side part. Therefore, the cutting blade of the cutter is formed in a shape that allows the cutting blade to be stored so as not to be cut, so that the cutting blade of the cutter faces the crossing side portion of the inner peripheral surface of the cutting blade storage portion (the cutting blade and It is possible to prevent a cut (cut) from being made on the opposite surface without making a contact with the opposite surface), and to prevent the crossing portion from being broken by being pushed by the inflating airbag. It is possible to prevent advancing beyond the linear part as necessary.

したがって、本発明に係るエアバッグカバーの製造方法では、破断予定部におけるＴ字状交差部の交差側部位を切り込み加工によって形成しても、不要な切れ目の発生を防止して加工できて、エアバッグの展開膨張時におけるエアバッグカバーの不必要な破片の飛散を防止できる。 Therefore, in the method of manufacturing an airbag cover according to the present invention, even if the crossing side portion of the T-shaped crossing portion in the planned breaking portion is formed by cutting, it can be processed while preventing unnecessary breakage, It is possible to prevent unnecessary fragments of the airbag cover from being scattered when the bag is deployed and inflated.

そして、加工具がカッタから構成されて、カッタの切刃が、先端から元部側にかけて、切り込み加工時の移動方向に向かって張り出すように、傾斜して形成されて、切刃収納部が、交差側部位側の底面を、交差側部位を切り込み加工するカッタの移動方向と平行な平坦面として、交差側部位から直線状部位に向かう方向で対向する位置に配置されている切刃収納部の面を、交差側部位から離れつつ切刃収納部の底面からも離れる傾斜面としている。 Then, the processing tool is constituted by a cutter, the cutting edge of the cutter, toward the base portion side from the front end, so that protrude toward the moving direction during rebated, inclined is formed, the cutting edge housing part The cutting blade storage portion disposed at a position facing the crossing portion from the crossing portion toward the linear portion, with the bottom surface on the crossing portion side being a flat surface parallel to the moving direction of the cutter for cutting the crossing portion. This surface is an inclined surface that is also separated from the bottom surface of the cutting blade storage portion while being separated from the intersecting side portion.

このような構成では、破断予定部における交差側部位を切り込み加工するカッタが、切刃の先端を切刃収納部の平坦な底面に食い込ませた状態としていても、切刃における先端から離れる元部側部位では、傾斜面から離れた位置に配置させることができる。すなわち、平坦な底面に切刃の先端を食い込ませておくことが可能となり、逆に、切刃収納部の底面として、切刃を食い込ませるように構成して、その領域の肉厚を厚くすることができ、切刃収納部の薄肉化を防止できて、エアバッグカバーの表面側における切刃収納部の領域に、ヒケやツヤムラが生ずることを防止できる。   In such a configuration, even when the cutter for cutting the crossing side portion in the planned fracture portion has the cutting blade tip bite into the flat bottom surface of the cutting blade storage portion, the base portion that is separated from the leading edge of the cutting blade In the side part, it can arrange | position in the position away from the inclined surface. That is, it is possible to bite the tip of the cutting edge into the flat bottom surface, and conversely, the bottom edge of the cutting blade storage unit is configured to bite into the cutting edge, thereby increasing the thickness of the region. It is possible to prevent the cutting blade storage portion from being thinned, and to prevent the occurrence of sink marks and gloss unevenness in the region of the cutting blade storage portion on the surface side of the airbag cover.

上記のような構成の場合、直線状部位は、カッタを使用して切り込み加工される部位とするとともに、切刃収納部の平坦な底面の領域を通るように配設することが望ましい。   In the case of the above configuration, it is desirable that the linear part is a part that is cut using a cutter, and that the straight part passes through the flat bottom region of the cutting blade storage unit.

このような構成では、交差側部位と直線状部位とが、共に、切刃収納部の平坦な底面に食い込むように切り込み加工されていたり、一方だけが、切刃収納部の底面における平坦面に食い込むように切り込み加工されていても、膨張するエアバッグに押されて生ずる交差側部位の破断が、直線状部位を越え、さらに、切刃収納部の傾斜面を越えて進行することを防止できる。すなわち、交差側部位の切れ目の深さが、切刃収納部の底面に到達しない深さであれば、直線状部位の切れ目の深さが、切刃収納部の底面に到達していない、あるいは、到達している、に拘わらず、膨張するエアバッグに押されて生ずる交差側部位の破断は、切刃収納部の部位で、進行が停止される。また、交差側部位の切れ目の深さが切刃収納部の底面の深さを越えている場合であって、交差側部位の切れ目が、切刃収納部の底面の領域内で、かつ、直線状部位の領域を越えて形成されていても、その延長上には、切刃収納部の底面より肉厚を急激に厚くするような傾斜面の部位が形成されているため、膨張するエアバッグに押されて生ずる交差側部位の破断が、切刃収納部の傾斜面を越えて進行することを防止できる。   In such a configuration, both the crossing side portion and the linear portion are cut so as to bite into the flat bottom surface of the cutting blade storage portion, or only one of them is a flat surface on the bottom surface of the cutting blade storage portion. Even if the cutting process is performed so as to bite, it is possible to prevent the breakage of the crossing side portion caused by being pushed by the inflating airbag from going beyond the linear portion and further beyond the inclined surface of the cutting blade storage portion. . That is, if the depth of the cut at the intersecting portion is a depth that does not reach the bottom surface of the cutting blade storage portion, the depth of the cut at the straight portion does not reach the bottom surface of the cutting blade storage portion, or Regardless of whether or not it is reached, the breakage of the crossing side portion caused by being pushed by the inflating airbag is stopped at the portion of the cutting blade storage portion. Further, when the depth of the cut at the crossing portion exceeds the depth of the bottom surface of the cutting blade storage portion, the cut at the crossing portion is within the region of the bottom surface of the cutting blade storage portion and is a straight line Even if it is formed beyond the region of the shape-like part, an inflating airbag is formed on the extension because the part of the inclined surface is formed so that the wall thickness is sharply increased from the bottom surface of the cutting blade storage part. It is possible to prevent the breakage of the intersecting side portion caused by being pushed by the tip from proceeding beyond the inclined surface of the cutting blade storage portion.

以下、本発明の一実施形態を図面に基づいて説明すると、第１実施形態で製造するエアバッグカバー１０は、図１〜３に示すように、助手席用エアバッグ装置Ｓに使用されるものであり、オレフィン系熱可塑性エラストマー等から射出成形によって製造される合成樹脂製として、助手席前方のインストルメントパネル（以下、インパネとする）２の上面２ａ側の開口２ｂに配設されている。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An airbag cover 10 manufactured in the first embodiment is used for an airbag device S for a passenger seat as shown in FIGS. It is made of a synthetic resin manufactured by injection molding from an olefinic thermoplastic elastomer or the like, and is disposed in the opening 2b on the upper surface 2a side of the instrument panel (hereinafter referred to as instrument panel) 2 in front of the passenger seat.

なお、本明細書での上下、前後、及び、左右の方向は、エアバッグカバー１０の車両搭載状態を基準として、車両の直進状態における車両の上下、前後、及び、左右の方向に一致するものである。   In the present specification, the up / down, front / rear, and left / right directions correspond to the up / down, front / rear, and left / right directions of the vehicle in a straight traveling state of the vehicle with the airbag cover 10 mounted as a reference. It is.

また、助手席用エアバッグ装置Ｓは、折り畳まれたエアバッグ４と、エアバッグ４に膨張用ガスを供給するインフレーター７と、エアバッグ４及びインフレーター７を収納保持するケース８と、エアバッグ４をケース８に取り付けるためのリテーナ５と、折り畳まれたエアバッグ４を覆うエアバッグカバー１０と、を備えて構成されている。   The passenger airbag device S includes a folded airbag 4, an inflator 7 that supplies inflation gas to the airbag 4, a case 8 that stores and holds the airbag 4 and the inflator 7, and the airbag 4. Is provided with a retainer 5 for attaching to the case 8 and an airbag cover 10 that covers the folded airbag 4.

エアバッグ４は、膨張完了時の形状を、前端側を頂部とし、底面の後面側を乗員拘束部とする略四角錐形状とされている。このエアバッグ４は、車両への搭載時、助手席前方におけるインパネ２の上面２ａ側に折り畳まれて収納されて、膨張用ガスの流入時に、インパネ上面２ａとインパネ２上方の図示しないウインドシールドとの間を塞ぐように、上方へ突出するとともに後方側へ突出して、後面側の乗員拘束部によって、乗員を保護することとなる。   The airbag 4 has a substantially quadrangular pyramid shape with the front end side as a top portion and the rear surface side of the bottom surface as an occupant restraint portion when the inflation is completed. The air bag 4 is folded and housed on the upper surface 2a side of the instrument panel 2 in front of the passenger seat when mounted on a vehicle, and an unillustrated windshield above the instrument panel upper surface 2a and the instrument panel 2 when inflating gas flows in. In order to close the gap between the two, it protrudes upward and protrudes rearward, and the occupant restraint portion on the rear surface side protects the occupant.

また、インフレーター７は、複数のガス吐出口７ｂを有した略円柱状の本体部７ａと、インフレーター７をケース８に取り付けるためのフランジ部７ｃと、を備えて構成されている。   The inflator 7 includes a substantially cylindrical main body portion 7 a having a plurality of gas discharge ports 7 b and a flange portion 7 c for attaching the inflator 7 to the case 8.

さらに、ケース８は、上端側に長方形状の開口を有した板金製の略直方体形状に形成され、インフレーター７を下方から挿入させて取り付ける略長方形板状の底壁部８ａと、底壁部８ａの外周縁から上方に延びる周壁部８ｂと、を備えて構成され、周壁部８ｂの上端には、エアバッグカバー１０の側壁部３３を係止する複数の係止爪８ｃが、形成されている。ケース８には、底壁部８ａの部位に、車両のボディ１側に連結されるブラケット８ｄが、配設されている。   Further, the case 8 is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening on the upper end side, and a substantially rectangular plate-like bottom wall portion 8a to which the inflator 7 is inserted from below and attached, and the bottom wall portion 8a. And a plurality of locking claws 8c for locking the side wall 33 of the airbag cover 10 are formed at the upper end of the peripheral wall 8b. . The case 8 is provided with a bracket 8d connected to the body 1 side of the vehicle at the bottom wall 8a.

なお、エアバッグ４とインフレーター７とは、エアバッグ４内に配設される円環状のリテーナ５の複数のボルト５ａが、エアバッグ４の開口４ａの周縁４ｂ、インフレーター７のフランジ部７ｃ、及び、ケース底壁部８ａ、を貫通して、ナット６止めされることにより、ケース８に取り付けられている。   The airbag 4 and the inflator 7 include a plurality of bolts 5 a of an annular retainer 5 disposed in the airbag 4, a peripheral edge 4 b of the opening 4 a of the airbag 4, a flange portion 7 c of the inflator 7, and The nut 6 is fixed to the case 8 by passing through the case bottom wall portion 8a.

エアバッグカバー１０は、図１〜５に示すように、インパネ２の開口２ａを塞ぐように長方形板状の天井壁部１１と、天井壁部１１の下面（裏面）側から下方に延びる略四角筒形状の側壁部３３と、を備えて構成されている。側壁部３３の前後の壁部３３ａ・３３ｂには、ケース周壁部８ｂの係止爪８ｃに周縁を係止させるための複数の係止孔３３ｅが形成されている。側壁部３３は、折り畳んだエアバッグ４の周囲をケース周壁部８ｂとともに覆う部位となる。   As shown in FIGS. 1 to 5, the airbag cover 10 has a rectangular plate-like ceiling wall portion 11 so as to close the opening 2 a of the instrument panel 2, and a substantially square extending downward from the lower surface (back surface) side of the ceiling wall portion 11. And a cylindrical side wall portion 33. A plurality of locking holes 33e are formed in the front and rear wall portions 33a and 33b of the side wall portion 33 to lock the periphery of the locking claw 8c of the case peripheral wall portion 8b. The side wall portion 33 is a portion that covers the periphery of the folded airbag 4 together with the case peripheral wall portion 8b.

天井壁部１１は、側壁部３３で囲まれた部位に配置される突出用開口部１２と、その周囲の周縁部３１と、を備えて構成されている。周縁部３１には、エアバッグカバー１０がインパネ２の開口２ｂを塞ぐように配設された際に、ガタツキを無くすように、開口２ｂ周縁に形成される複数の係止脚３１ａが、下方へ突設されている。 The ceiling wall portion 11 is configured to include a protruding opening portion 12 disposed at a portion surrounded by the side wall portion 33 and a peripheral edge portion 31 around it. A plurality of locking legs 31 a formed on the periphery of the opening 2 b are provided on the periphery 31 so as to eliminate rattling when the airbag cover 10 is disposed so as to close the opening 2 b of the instrument panel 2. Projected.

突出用開口部１２は、長方形板状として、線状に延びる薄肉の破断予定部１６が配設されている。この破断予定部１６は、エアバッグカバー１０の裏面側から表面側に凹む凹溝１６ａ・１６ｂを設けて形成されるとともに、第１実施形態の場合、直線状部位１７・１８に対して交差側部位１９を平面視の状態でＴ字状に交差させるＴ字状交差部２０を２箇所に配置させて、平面視の形状をＨ字形状としている。そのため、破断予定部１６の破断時には、交差側部位１９を間にする前後二枚の扉部１３・１４が前後両側に開いて、エアバッグ４の突出用の長方形状の開口１２ａを形成することとなる。開き時の扉部１３は、前縁側に配置されたヒンジ部１５を回転中心として、上方へ向かいつつ前方側に開き、開き時の扉部１４は、後縁側のヒンジ部１５を回転中心として、上方へ向かいつつ後方側に開くこととなる。各ヒンジ部１５は、Ｈ字の両側の縦棒部（直線状部位１７・１８）の左右方向で対向する両端相互を結ぶ部位として、側壁部３３の前後の壁部３３ａ・３３ｂの内側面の位置に、配置されている。   The protruding opening 12 has a rectangular plate shape and is provided with a thin portion to be broken 16 extending linearly. The breakable portion 16 is formed by providing concave grooves 16a and 16b that are recessed from the rear surface side to the front surface side of the airbag cover 10, and in the case of the first embodiment, intersects the linear portions 17 and 18. The T-shaped intersections 20 that intersect the region 19 in a T shape in a plan view are arranged at two locations, and the shape in the plan view is an H shape. Therefore, when the planned breakage portion 16 is broken, the front and rear two door portions 13 and 14 with the intersecting side portion 19 in between are opened on both the front and rear sides to form a rectangular opening 12a for protruding the airbag 4. It becomes. The door 13 at the time of opening opens to the front side while turning upward, with the hinge portion 15 disposed on the front edge side as the rotation center, and the door 14 at the time of opening, with the hinge portion 15 on the rear edge side as the rotation center, It will open to the rear side while heading upward. Each hinge portion 15 is a portion connecting the opposite ends in the left-right direction of the vertical bar portions (linear portions 17 and 18) on both sides of the H-shape, on the inner side surfaces of the wall portions 33a and 33b before and after the side wall portion 33. In place.

そして、第１実施形態の場合、破断予定部１６は、二種類の凹溝１６ａ・１６ｂから形成され、２本の直線状部位１７・１８は、エアバッグカバー１０の射出成形時に型成形により形成される凹溝１６ｂを設けて構成され、交差側部位１９が、エアバッグカバー１０の成形後に、切削屑や切粉を排出せずに切れ目を入れるように、カッタ３５を使用して形成した凹溝１６ａを設けて構成されている。   And in the case of 1st Embodiment, the fracture | rupture scheduled part 16 is formed from two types of ditch | grooves 16a * 16b, and two linear part 17 * 18 is formed by mold shaping at the time of the injection molding of the airbag cover 10. FIG. The concave portion 16b is formed by using the cutter 35 so that the intersecting side portion 19 is cut after the airbag cover 10 is formed without discharging cutting chips and chips. A groove 16a is provided.

カッタ３５は、第１実施形態の場合、図６に示すように、本体部３６の厚さを０．５〜１．０ｍｍとした超音波カッタとして、片刃の切刃３７を備える構成として、切刃３７は、先端３７ａから元部３７ｂ側にかけて、切り込み加工時の移動方向に向かって張り出すように、傾斜して形成されている。そして、第１実施形態の場合、カッタ３５は、移動方向前方側に切刃３７を配置させて、移動させることにより、凹溝１６ａを形成する切れ目を形成することとなる。   In the case of the first embodiment, as shown in FIG. 6, the cutter 35 is an ultrasonic cutter in which the thickness of the main body 36 is 0.5 to 1.0 mm, and includes a single-edged cutting blade 37. The blade 37 is formed to be inclined so as to protrude from the tip 37a toward the base portion 37b toward the moving direction during the cutting process. And in the case of 1st Embodiment, the cutter 35 will form the cut | interruption which forms the ditch | groove 16a by arrange | positioning and moving the cutting edge 37 to the moving direction front side.

そして、エアバッグカバー１０の破断予定部１６の各Ｔ字状交差部２０には、カバー１０の表面側に凹む切刃収納部２１が形成されている。切刃収納部２１は、成形時に予め形成されているものであり、Ｔ字状交差部２０に向けて交差側部位１９を切り込み加工しつつ移動するカッタ３５の切刃３７を交差側部位１９から離脱させた際に、交差側部位１９から直線状部位１８に向かう方向で対向する位置に配置される切刃収納部２１の面２３に対して切れ目を入れない状態として、切刃３７を収納可能な形状に形成されている。   A cutting blade storage portion 21 that is recessed on the surface side of the cover 10 is formed in each T-shaped intersection 20 of the planned break portion 16 of the airbag cover 10. The cutting blade storage portion 21 is formed in advance at the time of molding, and the cutting blade 37 of the cutter 35 that moves while cutting the intersection side portion 19 toward the T-shaped intersection portion 20 is moved from the intersection side portion 19. The cutting blade 37 can be stored in a state in which no cut is made with respect to the surface 23 of the cutting blade storage portion 21 that is disposed at a position facing in the direction from the intersecting side portion 19 to the linear portion 18 when it is detached. It is formed in a simple shape.

第１実施形態の場合、切刃収納部２１は、交差側部位１９側の底面２２を、交差側部位１９を切り込み加工するカッタ３５の移動方向と平行な平坦面として、交差側部位１９から直線状部位１８に向かう方向で対向する位置に配置されている切刃収納部２１の面を、交差側部位１９から離れつつ切刃収納部２１の底面２２からも離れる傾斜面２３としている。傾斜面２３は、第１実施形態の場合、切り込み加工時におけるカッタ３５の切刃３７と平行となる角度に形成されている。なお、この傾斜面２３は、切刃収納部２１の開口面積を広げ過ぎない範囲で、切刃３７とに隙間を空ける角度として、底面２２からの開き角度を大きく傾斜させてもよい。そして、第１実施形態の場合、切刃収納部２１は、底面２２の前後の外周縁から側面側壁面２５・２６が拡開して下方に延び（図５参照）、傾斜面２３と対向している面２４を切刃３７が切刃収納部２１に侵入してくる入口側壁面２４として、底面２２の縁から上下方向に沿って下方に延びるように配設されている。   In the case of the first embodiment, the cutting blade storage portion 21 is a straight line from the crossing side part 19 with the bottom surface 22 on the crossing side part 19 side as a flat surface parallel to the moving direction of the cutter 35 that cuts the crossing side part 19. The surface of the cutting blade storage portion 21 arranged at a position facing in the direction toward the shaped portion 18 is an inclined surface 23 that is separated from the bottom surface 22 of the cutting blade storage portion 21 while being away from the intersecting side portion 19. In the case of the first embodiment, the inclined surface 23 is formed at an angle parallel to the cutting edge 37 of the cutter 35 during the cutting process. In addition, as for this inclined surface 23, you may make the opening angle from the bottom face 22 large as an angle which leaves a clearance gap with the cutting blade 37 in the range which does not enlarge the opening area of the cutting blade storage part 21 too much. In the case of the first embodiment, the cutting blade storage portion 21 has the side wall surfaces 25 and 26 expanded from the front and rear outer peripheral edges of the bottom surface 22 to extend downward (see FIG. 5), and faces the inclined surface 23. The surface 24 is formed as an inlet side wall surface 24 through which the cutting blade 37 enters the cutting blade storage portion 21 so as to extend downward from the edge of the bottom surface 22 along the vertical direction.

さらに、第１実施形態の場合、カッタ３５は、直線状部位１７から直線状部位１８に向かうように右方向に移動させて、交差側部位１９を形成するため、傾斜面２３が、切刃側対向面として側壁部３３の右壁部３３ｄ側に配置され、入口側壁面２４が、峰側対向面として左壁部３３ｃ側に配置されている。   Furthermore, in the case of the first embodiment, the cutter 35 is moved rightward from the linear portion 17 toward the linear portion 18 to form the intersecting side portion 19, so that the inclined surface 23 is formed on the cutting edge side. The opposing side surface is disposed on the right wall 33d side of the side wall 33, and the inlet side wall surface 24 is disposed on the left wall 33c side as the ridge side opposing surface.

なお、エアバッグカバー１０の肉厚は、天井壁部１１における側壁部３３から離れた周縁部３１や扉部１３・１４の中央付近の一般部１１ａの肉厚Ｔ０が４ｍｍ程度として、切刃収納部２１を含めた破断予定部１６の肉厚を０．６〜１．５ｍｍの範囲内とするように設定され、破断予定部１６の周囲の部位の肉厚Ｔ１が２〜３ｍｍ（第１実施形態では２ｍｍ）とし、切刃収納部２１の深さＤ０が１．０〜２．０ｍｍ（第１実施形態では１．２ｍｍ）とし、凹溝１６ａの深さＤ１が０．８〜１．０ｍｍ（第１実施形態では１．０ｍｍ）とし、凹溝１６ｂの深さＤ２が０．８〜１．０ｍｍ（第１実施形態では１．０ｍｍ）としている。そのため、切刃収納部２１の部位の肉厚Ｔ２が０．６〜０．８ｍｍ（第１実施形態では０．８ｍｍ）とし、凹溝１６ａ・１６ｂの部位の肉厚Ｔ３・Ｔ４は０．８〜１．０ｍｍ（第１実施形態では１．０ｍｍ）としている。凹溝１６ｂの幅Ｗ２は０．３〜１．５ｍｍ（第１実施形態では０．５ｍｍ）としている。   The thickness of the airbag cover 10 is set such that the thickness T0 of the peripheral portion 31 away from the side wall portion 33 of the ceiling wall portion 11 and the general portion 11a near the center of the door portions 13 and 14 is about 4 mm. The thickness of the planned fracture portion 16 including the portion 21 is set to be in the range of 0.6 to 1.5 mm, and the thickness T1 of the portion around the planned fracture portion 16 is 2 to 3 mm (first embodiment) In the embodiment, the depth D0 of the cutting blade storage portion 21 is 1.0 to 2.0 mm (1.2 mm in the first embodiment), and the depth D1 of the groove 16a is 0.8 to 1.0 mm. (1.0 mm in the first embodiment), and the depth D2 of the groove 16b is 0.8 to 1.0 mm (1.0 mm in the first embodiment). Therefore, the thickness T2 of the part of the cutting blade storage portion 21 is 0.6 to 0.8 mm (0.8 mm in the first embodiment), and the thicknesses T3 and T4 of the parts of the concave grooves 16a and 16b are 0.8. To 1.0 mm (1.0 mm in the first embodiment). The width W2 of the concave groove 16b is set to 0.3 to 1.5 mm (0.5 mm in the first embodiment).

また、切刃収納部２１の前後の側面側壁面２５・２６の間の底面２２側の幅Ｗ１は２〜３ｍｍ（第１実施形態では２ｍｍ）とし、切刃収納部２１の左右方向の長さＬ１も２〜３ｍｍ（第１実施形態では３ｍｍ）とし、底面２２の長さＬ２は、第１実施形態の場合、約１．５ｍｍとしている。なお、これらの幅Ｗ１や長さＬ１の寸法は、後述するように、切り込み加工でセットするカバー素材９が、セット台Ｊに対して位置ずれしてセットされる寸法分を考慮して、設定されている。   The width W1 on the bottom surface 22 side between the front and rear side wall surfaces 25 and 26 of the cutting blade storage portion 21 is 2 to 3 mm (2 mm in the first embodiment), and the length of the cutting blade storage portion 21 in the left-right direction is set. L1 is also 2 to 3 mm (3 mm in the first embodiment), and the length L2 of the bottom surface 22 is about 1.5 mm in the first embodiment. The dimensions of the width W1 and the length L1 are set in consideration of the dimension in which the cover material 9 to be set by cutting is set with a positional deviation with respect to the set base J, as will be described later. Has been.

さらに、側壁部３３の肉厚Ｂは２〜３ｍｍ（第１実施形態では２ｍｍ）としている。なお、天井壁部１１の側壁部３３の近傍には、扉部１３・１４側における直線状部位１７・１８近傍の薄肉部２８と、側壁部３３の外周側に位置して側壁部３３側に肉厚を漸減させる薄肉部２９と、が配設され、側壁部３３の部位の天井壁部１１の表面側にヒケやツヤムラ等が生じないように、これらの薄肉部２８・２９は、側壁部３３の肉厚Ｂに近似させるように、配設されている。   Further, the wall thickness B of the side wall 33 is 2 to 3 mm (2 mm in the first embodiment). In addition, in the vicinity of the side wall portion 33 of the ceiling wall portion 11, the thin portion 28 in the vicinity of the linear portions 17, 18 on the door portion 13, 14 side and the outer peripheral side of the side wall portion 33 are located on the side wall portion 33 side. A thin wall portion 29 for gradually reducing the wall thickness, and the thin wall portions 28 and 29 are provided on the side wall portion so that sink marks and gloss unevenness do not occur on the surface side of the ceiling wall portion 11 at the side wall portion 33. It is arranged so as to approximate the wall thickness B of 33.

このエアバッグカバー１０の製造について述べれば、先ず、所定の射出形成型を使用して、直線状部位１７・１８の凹溝１６ｂが形成されて凹溝１６ａが形成されていないカバー素材９を成形する。そして、このカバー素材９を成形型から取り出して、図６のＡに示すように、カッタ３５を配設させたカッタ装置Ｃのセット台Ｊに配置させる。なお、このセット台Ｊには、加工時のカバー素材９をずらさないように、セット台Ｊ側に吸着させる図示しない吸引装置が配設されている。また、カッタ装置Ｃは、カッタ３５のセット台Ｊに沿った平行移動やセット台Ｊと直交する上下移動のＸＹＺ軸方向の３軸移動を可能に、カッタ３５を保持する保持機構と、保持機構の作業を制御する制御回路と、を備えるとともに、さらに、加工部位を計測するレーザ変位計等を備えた測定機器と、を備えて構成されている。   When manufacturing the airbag cover 10 is described, first, the cover material 9 in which the concave grooves 16b of the linear portions 17 and 18 are formed and the concave grooves 16a are not formed is formed using a predetermined injection mold. To do. Then, the cover material 9 is taken out of the mold and placed on the set base J of the cutter device C on which the cutter 35 is disposed, as shown in FIG. The set table J is provided with a suction device (not shown) that sucks the cover material 9 at the side of the set table J so as not to shift the cover material 9 during processing. The cutter device C also includes a holding mechanism that holds the cutter 35 and a holding mechanism that can perform parallel movement along the set base J of the cutter 35 and three-axis movement in the XYZ-axis direction perpendicular to the set base J. And a control circuit for controlling the above work, and further, a measuring device including a laser displacement meter or the like for measuring the processing site.

すなわち、カッタ３５の切り込み加工を行う前に、予め、直線状部位１７の切刃収納部２１（これを始端側の切刃収納部２１Ａとする）の位置から直線状部位１８の切刃収納部２１（これを終端側の切刃収納部２１Ｂとする）までの凹溝１６ａの切れ目を入れるためのカッタ３５の切刃３７の移動距離Ｌ０（図３参照）、凹溝１６ａの切れ目を入れるために切刃収納部２１Ａ内に挿入させるカッタ３５の切刃３７の挿入深さＤ１、さらに、切刃収納部２１Ａ・２１Ｂ間での凹溝１６ａを形成するための切刃３７の挿入深さＤ１、を確認するため、レーザ変位計等を通過させて、セット台Ｊにセットしたカバー素材９の凹溝１６ａの形成部位９ａ（図６のＡ参照）の外表面形状を読み取っておく。なお、その際の読み取り基準点Ｘ１・Ｘ２は、図６のＡ・Ｂに示すように、例えば、切刃収納部２１の底面２２と壁面２４との屈曲部とし、そして、底面２２からの薄肉部２８の外表面やカバー素材９の凹溝形成部位９ａの外表面の高さ位置を測定し、そのデータに基づいて、制御回路が、切れ目を入れないで、カッタ３５の切刃３７を始端側切刃収納部２１Ａに挿入させ、ついで、カッタ３５の切刃３７を終端側切刃収納部２１Ｂ内に移動させ、その後、カッタ３５の切刃３７を終端側切刃収納部２１Ｂから離脱させることとなる。 That is, before the cutting process of the cutter 35 is performed, the cutting blade storage portion of the linear portion 18 is previously determined from the position of the cutting blade storage portion 21 of the linear portion 17 (this is referred to as the cutting edge storage portion 21A on the start end side). 21 for moving the cutting edge 37 of the cutter 35 to make a cut in the concave groove 16a up to 21 (this is the cutting edge storage portion 21B on the terminal side) (see FIG. 3), to make a cut in the concave groove 16a The insertion depth D1 of the cutting blade 37 of the cutter 35 to be inserted into the cutting blade storage portion 21A, and the insertion depth D1 of the cutting blade 37 for forming the concave groove 16a between the cutting blade storage portions 21A and 21B. In order to confirm the above, the outer surface shape of the formation portion 9a (see A of FIG. 6) of the concave groove 16a of the cover material 9 set on the set base J is read through a laser displacement meter or the like. The reading reference points X1 and X2 at that time are, for example, bent portions of the bottom surface 22 and the wall surface 24 of the cutting blade storage portion 21 as shown in FIGS. 6A and 6B. The height position of the outer surface of the portion 28 and the outer surface of the concave groove forming portion 9a of the cover material 9 is measured, and based on the data, the control circuit starts the cutting edge 37 of the cutter 35 without making a cut. The cutting edge 37 of the cutter 35 is inserted into the side cutting edge storage part 21A, and then the cutting edge 37 of the cutter 35 is moved into the terminal side cutting edge storage part 21B, and then the cutting edge 37 of the cutter 35 is detached from the terminal side cutting edge storage part 21B. It will be.

そして、切り込み加工時、カッタ装置Ｃは、まず、カッタ３５の切刃３７を、直線状部位１８側に向けた状態として、直線状部位１７の始端側切刃収納部２１Ａ内に切り込み深さＤ１まで挿入させて停止させ、ついで、図６のＡ・Ｂに示すように、カッタ３５の切刃３７を直線状部位１８側のＴ字状交差部２０に向けて移動させて交差側部位１９を形成する。この交差側部位１９の全域に切れ目（切れ込み）を付けて凹溝１６ａを形成すれば、図６のＢ・Ｃに示すように、切り込み加工したカッタ３５の切刃３７は、Ｔ字状交差部２０の終端側切刃収納部２１Ｂに到達する。その際、切刃収納部２１Ｂは、カッタ３５の切刃３７側が交差側部位１９から離脱した際に、交差側部位１９から直線状部位１８に向かう方向で対向する位置に配置される切刃収納部２１Ｂの傾斜面２３に対して、切れ目を入れない状態として、切刃３７を収納可能とする形状に形成されている。そのため、カッタ３５の切刃３７が、切刃収納部２１Ｂの内周面における交差側部位１９と対向する面２３に切れ目を入れるように接触せず、その対向面２３に切れ目（切れ込み）を入れることを防止することができる。勿論、実施形態では、始端側切刃収納部２１Ａにおいても、交差側部位１９から直線状部位１７に向かう方向の面２４には、切刃３７が切り込まれていない。   At the time of the cutting process, the cutter device C first sets the cutting edge 37 of the cutter 35 to the linear part 18 side, and inserts the cutting depth D1 into the start edge side cutting blade storage portion 21A of the linear part 17. Then, as shown in FIGS. 6A and 6B, the cutting edge 37 of the cutter 35 is moved toward the T-shaped intersecting portion 20 on the straight portion 18 side, and the intersecting portion 19 is moved. Form. If the groove 16a is formed by making a cut (cut) in the entire area of the crossing side portion 19, the cutting edge 37 of the cut cutter 35 is formed into a T-shaped crossing portion as shown in FIGS. 20 end-side cutting blade storage part 21B is reached. At that time, the cutting blade storage portion 21B is disposed at a position facing the cutting edge 37 side of the cutter 35 in the direction from the crossing side portion 19 toward the linear portion 18 when the cutting blade 37 side is separated from the crossing side portion 19. With respect to the inclined surface 23 of the part 21 </ b> B, the cutting blade 37 is formed in a shape that can be accommodated so as not to be cut. Therefore, the cutting edge 37 of the cutter 35 does not come into contact with the surface 23 facing the intersecting side portion 19 on the inner peripheral surface of the cutting blade storage portion 21B so as to make a cut, and makes a cut (cut) in the facing surface 23. This can be prevented. Of course, in the embodiment, the cutting edge 37 is not cut into the surface 24 in the direction from the intersecting side portion 19 toward the linear portion 17 in the starting end side cutting blade storage portion 21A.

そして、凹溝１６ａからなる交差側部位１９を形成すれば、エアバッグカバー１０の製造が完了し、エアバッグ装置Ｓを組み立てるようにエアバッグカバー１０をセット台Ｊから取り外す。エアバッグ装置Ｓの組み立ては、予め、リテーナ５を収納して折り畳んでおいたエアバッグ４やインフレーター７を、ボルト５ａやナット６を利用してケース８に収納保持させて、エアバッグ組立体を形成しておく。そして、このエアバッグ組立体に対し、エアバッグカバー１０を被せて、各係止爪８ｃに係止孔２８ｅの周縁を係止させ、その後、エアバッグカバー１０を組付済みのエアバッグ組立体を、予め車両に搭載されているインパネ２の開口２ｂから挿入し、各係止脚３１ａを開口周縁２ｃに係止させるとともに、ケース８のブラケット８ｄをボディ１側に締結する。そして、エアバッグ作動回路から延びる所定の作動信号入力用のリード線をインフレーター７に接続させれば、エアバッグ装置Ｓを車両に搭載することができる。 And if the cross | intersection part 19 which consists of the ditch | groove 16a is formed, manufacture of the airbag cover 10 will be completed and the airbag cover 10 will be removed from the set stand J so that the airbag apparatus S may be assembled. The assembly of the airbag device S is performed by storing and holding the airbag 4 and the inflator 7 that have been stored and folded in advance in the case 8 using the bolts 5a and nuts 6, and the airbag assembly is assembled. Form it. Then, the airbag assembly 10 is covered with the airbag cover 10, the peripheral edges of the locking holes 28 e are locked to the locking claws 8 c, and then the airbag cover 10 is assembled. Is inserted through the opening 2b of the instrument panel 2 mounted on the vehicle in advance, and the locking legs 31a are locked to the opening peripheral edge 2c, and the bracket 8d of the case 8 is fastened to the body 1 side. The airbag device S can be mounted on the vehicle by connecting a lead wire for inputting a predetermined actuation signal extending from the airbag actuation circuit to the inflator 7.

エアバッグ装置Ｓの作動時には、インフレーター７からの膨張用ガスがエアバッグ４に流入して、エアバッグ４が膨張すれば、エアバッグ４は、突出用開口部１２を急激に押すことから、破断予定部１６を破断させて、エアバッグカバー１０の扉部１３・１４を前後両側に開かせ、開いて形成された突出用開口１２ａから、助手席に着座している乗員を保護可能に、大きく突出することとなる。   When the airbag device S is operated, if the inflation gas from the inflator 7 flows into the airbag 4 and the airbag 4 is inflated, the airbag 4 abruptly pushes the protruding opening 12 and thus breaks. The planned portion 16 is broken so that the door portions 13 and 14 of the airbag cover 10 are opened to the front and rear sides, and the opening 12a formed to open can be used to protect a passenger seated in the passenger seat. It will protrude.

そして、第１実施形態のエアバッグカバー１０の製造方法では、既述したように、交差側部位１９を切り込み加工したカッタ３５の切刃３７が、Ｔ字状交差部２０の切刃収納部２１Ｂに到達して交差側部位１９から離脱した際、カッタ３５の切刃３７側が、交差側部位１９から直線状部位１８に向かう方向で対向する位置に配置される切刃収納部２１Ｂの面２３に対して、切れ目を入れない状態として、収納される形状に、終端側切刃収納部２１Ｂが形成されている。そのため、切刃収納部２１Ｂの対向面２３には切刃３７による切れ目（切れ込み）が形成されておらず、膨張するエアバッグ４に押されて生ずる交差側部位１９の破断は、切刃収納部２１Ｂを越えて進行するように、直線状部位１８を越えることを防止できる。 And in the manufacturing method of the airbag cover 10 of 1st Embodiment, as mentioned above, the cutting blade 37 of the cutter 35 which cut-in the intersection side site | part 19 is the cutting blade storage part 21B of the T-shaped intersection part 20. As shown in FIG. When the cutting blade 37 side of the cutter 35 is separated from the intersecting side portion 19 and reaches the surface 23 of the cutting blade storage portion 21B disposed at a position facing in the direction from the intersecting side portion 19 toward the linear portion 18. On the other hand, the terminal-side cutting blade storage portion 21B is formed in a shape that is stored so as not to be cut. For this reason, the cut surface (cut) by the cutting blade 37 is not formed on the opposing surface 23 of the cutting blade storage portion 21B, and the breakage of the intersecting side portion 19 caused by being pushed by the inflating airbag 4 is caused by the cutting blade storage portion. It is possible to prevent the linear portion 18 from being exceeded so as to advance beyond 21B.

勿論、切刃収納部２１Ａにおける交差側部位１９と対向する対向面２４にも、切刃３７による切れ目（切れ込み）が形成されておらず、膨張するエアバッグ４に押されて生ずる交差側部位１９の破断は、切刃収納部２１Ａを越えて進行するように、直線状部位１７を越えることを防止できる。   Needless to say, the cut surface (cut) by the cutting blade 37 is not formed on the facing surface 24 facing the crossing side portion 19 in the cutting blade storage portion 21 </ b> A, and the crossing side portion 19 generated by being pushed by the inflating airbag 4. Can be prevented from exceeding the linear portion 17 so as to proceed beyond the cutting edge storage portion 21A.

したがって、第１実施形態のエアバッグカバー１０の製造方法では、破断予定部１６におけるＴ字状交差部２０の交差側部位１９を切り込み加工によって形成しても、不要な切れ目の発生を防止して加工できて、エアバッグ４の展開膨張時におけるエアバッグカバー１０の不必要な破片の飛散を防止できる。 Therefore, in the method of manufacturing the airbag cover 10 according to the first embodiment, even if the intersecting side portion 19 of the T-shaped intersecting portion 20 in the planned breaking portion 16 is formed by cutting, an unnecessary cut is prevented. The air bag 4 can be processed and unnecessary fragments of the air bag cover 10 can be prevented from being scattered when the air bag 4 is deployed and inflated.

なお、カッタ３５の切り込み加工の際、側壁部３３の左・右壁部３３ｃ・３３ｄがカッタ３５自体やその保持機構等と干渉するような場合、図７に示すように、左・右壁部３３ｃ・３３ｄと直線状部位１７・１８との間の領域２８を、広くして対処すればよい。その場合、その領域２８の全域を薄肉とすれば、車両への搭載時、撓んで扉部１３・１４の領域全体を下降させて、天井壁部１１の表面側に不要な凹部を形成する虞れが生ずる。そのため、図７・９に示すエアバッグカバー１０Ａ・１０Ｂのように、側壁部３３の部位における天井壁部１１の表面側にヒケ等が生じないように、少なくとも側壁部３３の近傍の部位を薄肉として、その領域２８の撓みを防止できるように、図７・８に示すように、断面半円形の突条２８ａを設けたり、図９・１０に示すように、三角板状の多数の補強リブ２８ｂを配設することが望ましい。   In the case of cutting the cutter 35, when the left and right wall portions 33c and 33d of the side wall portion 33 interfere with the cutter 35 itself, its holding mechanism, etc., as shown in FIG. What is necessary is just to make wide the area | region 28 between 33c * 33d and the linear site | parts 17 * 18. In that case, if the entire area 28 is made thin, when mounted on the vehicle, the entire area of the door portions 13, 14 may be bent and bent to form unnecessary concave portions on the surface side of the ceiling wall portion 11. This happens. Therefore, as in the airbag covers 10A and 10B shown in FIGS. 7 and 9, at least a portion near the side wall portion 33 is thin so as not to cause sink marks or the like on the surface side of the ceiling wall portion 11 in the side wall portion 33 portion. As shown in FIGS. 7 and 8, a protrusion 28a having a semicircular cross section is provided as shown in FIGS. 7 and 8, and a large number of triangular rib-shaped reinforcing ribs 28b are used as shown in FIGS. It is desirable to arrange.

また、第１実施形態では、切刃収納部２１の形状を、交差側部位１９に沿った左右方向の断面として、台形とした凹形状を例示したが、図１１〜１５に示す第２実施形態のエアバッグカバー４０の製造方法のように、交差側部位１９に沿った左右方向の断面を、三角形の凹形状とした切刃収納部４１としてもよい。なお、この第２実施形態のエアバッグカバー４０は、第１実施形態と同様に、助手席用エアバッグ装置に使用されるとともに、２本の直線状部位１７・１８と１本の交差側部位１９とを備えたＨ字状の破断予定部１６を備えて、交差側部位１９の左右両端をＴ字状交差部２０として構成されている。但し、交差側部位１９とともに、直線状部位１７・１８もカッタ３５を使用したり切り込み加工によって形成されている点が、第１実施形態と相違している。すなわち、破断予定部１６が、切刃収納部４１を除いて、切り込み加工による凹溝１６ａだけで構成されている。さらに、直線状部位１７・１８のそれぞれの両端にも切刃収納部４１が配設されている。これらの点が第１実施形態と相違しているだけであり、他の構成は、第１実施形態と同様であり、同一符号を付して説明を省略する。 Moreover, in 1st Embodiment, although the shape of the cutting blade accommodating part 21 illustrated the trapezoidal concave shape as a cross section of the left-right direction along the cross | intersection side part 19, 2nd Embodiment shown to FIGS. It is good also as the cutting blade accommodating part 41 which made the cross section of the left-right direction along the cross | intersection side part 19 into the triangular concave shape like the manufacturing method of the airbag cover 40 of this . Note that the airbag cover 40 of the second embodiment is used in the passenger seat airbag device, as in the first embodiment, and has two linear portions 17 and 18 and one intersection side portion. 19, the left and right ends of the intersecting portion 19 are configured as T-shaped intersecting portions 20. However, it is different from the first embodiment in that the straight portions 17 and 18 are formed by using the cutter 35 or by the cutting process together with the intersecting portion 19. That is, the fracture | rupture scheduled part 16 is comprised only by the ditch | groove 16a by a cutting process except the cutting blade accommodating part 41. FIG. Further, the cutting blade storage portions 41 are also disposed at both ends of each of the linear portions 17 and 18. These points are only different from those of the first embodiment, and other configurations are the same as those of the first embodiment.

そして、第２実施形態の切刃収納部４１も、成形後のカバー素材３９に予め形成されているものであり、図１４に示すように、Ｔ字状交差部２０に向けて交差側部位１９を切り込み加工しつつ移動するカッタ３５の切刃３７を交差側部位１９から離脱させた際に、交差側部位１９から直線状部位１８に向かう方向で対向する位置に配置される切刃収納部４１の面４３に対して切れ目を入れない状態として、切刃３７を収納可能な形状に形成されている。この切刃収納部４１は、傾斜した面４３と、上下方向に沿って配置される壁面４４と、前後に位置する壁面４５・４６と、を備えて構成されいる。   And the cutting blade storage part 41 of 2nd Embodiment is also previously formed in the cover raw material 39 after shaping | molding, and as shown in FIG. When the cutting edge 37 of the cutter 35 that moves while cutting is removed from the intersecting side part 19, the cutting blade storage part 41 arranged at a position facing in the direction from the intersecting part 19 toward the linear part 18. The cutting edge 37 is formed in a shape that can be accommodated so as not to make a cut with respect to the surface 43. The cutting blade storage portion 41 includes an inclined surface 43, a wall surface 44 arranged along the vertical direction, and wall surfaces 45 and 46 positioned in the front-rear direction.

なお、第２実施形態でも、直線状部位１７側のＴ字状交差部２０の切刃収納部４１がカッタ３５の切刃３７が挿入される始端側切刃収納部４１Ａとし、直線状部位１８側のＴ字状交差部２０がカッタ３５の切刃３７が離脱する終端側切刃収納部４１Ｂとしている。   In the second embodiment as well, the cutting edge storage portion 41 of the T-shaped intersection 20 on the linear portion 17 side is the starting edge storage portion 41A into which the cutting blade 37 of the cutter 35 is inserted, and the linear portion 18 is used. The T-shaped intersecting portion 20 on the side serves as a terminal-side cutting blade storage portion 41B from which the cutting blade 37 of the cutter 35 is detached.

さらに、この第２実施形態では、直線状部位１７・１８の各両端の切刃収納部４１も、切り込み加工を行う際の一方が始端側切刃収納部４１Ａとし、他方が終端側切刃収納部４１Ｂとしている。そして、始端側切刃収納部４１Ａにカッタ３５の切刃３７が挿入される際には、上下方向に沿った対向面４４には、切れ込みが入らないように、切刃収納部４１Ａの内周形状が設定されている。なお、これらの切刃収納部４１の幅寸法や長さ寸法も、カバー素材３９をセット台Ｊにセットする際の位置ずれを考慮して設定されている。   Further, in the second embodiment, the cutting edge storage portions 41 at both ends of the linear portions 17 and 18 also have one end cutting edge storage portion 41A at the time of cutting and the other end end cutting edge storage. Part 41B. Then, when the cutting edge 37 of the cutter 35 is inserted into the starting end side cutting edge storage part 41A, the inner periphery of the cutting edge storage part 41A is set so that the opposing surface 44 along the vertical direction does not enter the cut. The shape is set. In addition, the width dimension and length dimension of these cutting blade storage parts 41 are also set in consideration of the positional deviation when the cover material 39 is set on the set base J.

そして、第２実施形態でも、図１４・１５に示すように、成形後のカバー素材３９をセット台Ｊにセットして、交差側部位１９や直線状部位１７・１８を切り込み加工することとなり、製造されたエアバッグカバー４０は、第１実施形態と同様な作用効果を得ることができる。すなわち、切刃収納部４１Ｂの交差側部位１９と対向する対向面４３や切刃収納部４１Ａの交差側部位１９と対向する対向面４４には、切刃３７による切れ目（切れ込み）が形成されておらず、膨張するエアバッグ４に押されて生ずる交差側部位１９の破断は、切刃収納部４１Ｂ・４１Ａを越えて進行するように、不必要に直線状部位１７・１８を越えることを防止でき、不要なエアバッグカバーの破断を防止できる。   And also in the second embodiment, as shown in FIGS. 14 and 15, the molded cover material 39 is set on the set base J, and the intersecting side portion 19 and the linear portions 17 and 18 are cut and processed. The manufactured airbag cover 40 can obtain the same effects as those of the first embodiment. That is, a cut (cut) by the cutting blade 37 is formed on the facing surface 43 facing the intersecting side portion 19 of the cutting blade storage portion 41B and the facing surface 44 facing the intersecting side portion 19 of the cutting blade storage portion 41A. The breakage of the crossing portion 19 caused by being pushed by the inflating airbag 4 is prevented from unnecessarily exceeding the linear portions 17 and 18 so as to proceed beyond the cutting blade storage portions 41B and 41A. This can prevent unnecessary breakage of the airbag cover.

なお、第２実施形態では、破断予定部１６の凹溝１６ａの深さが、切刃収納部４１より浅い場合を示したが、直線状部位１７・１８での凹溝１６ａは、図１６に示すように、Ｔ字状交差部２０の部位での切刃収納部４１より、深く形成してもよい。なぜなら、交差側部位１９の凹溝１６ａが、Ｔ字状交差部２０の切刃収納部４１より浅いことから、膨張するエアバッグに押されて破断する交差側部位１９は、その破断の進行が、Ｔ字状交差部２０の切刃収納部４１Ａの対向面４４や切刃収納部４１Ｂの対向面４３によって、停止されるからである。   In addition, in 2nd Embodiment, although the case where the depth of the ditch | groove 16a of the planned fracture | rupture part 16 was shallower than the cutting blade accommodating part 41 was shown, the ditch | groove 16a in the linear site | parts 17 and 18 is shown in FIG. As shown, it may be formed deeper than the cutting blade storage portion 41 at the site of the T-shaped intersection 20. This is because the groove 16a of the intersecting side portion 19 is shallower than the cutting edge storage portion 41 of the T-shaped intersecting portion 20, and the breaking of the intersecting side portion 19 that is broken by being pushed by the inflating airbag progresses. This is because it is stopped by the facing surface 44 of the cutting blade storage portion 41A of the T-shaped intersection 20 or the facing surface 43 of the cutting blade storage portion 41B.

また、第３実施形態のエアバッグカバー５０の製造方法のように、第１実施形態と同様な台形状の切刃収納部２１を配置させて、直線状部位１７・１８と交差側部位１９とからなるＨ字形状の破断予定部１６を、切刃収納部２１を除いて、切り込み加工による凹溝１６ａから形成してもよい。 Moreover, like the manufacturing method of the airbag cover 50 of 3rd Embodiment, the trapezoidal cutting blade accommodating part 21 similar to 1st Embodiment is arrange | positioned, and the linear site | parts 17 and 18 and the cross | intersection side site | part 19 and The H-shaped rupture scheduled portion 16 may be formed from the concave groove 16a formed by the cutting process except for the cutting blade storage portion 21.

なお、このエアバッグカバー５０では、Ｔ字状交差部２０の切刃収納部２１Ａ・２１Ｂの部位だけでなく、直線状部位１７・１８の各切刃収納部２１Ａ・２１Ｂの部位でも、カッタ３５の切刃３７が、その底面２２に食い込んで、凹溝１６ａを形成している。すなわち、セット台Ｊにセットしたカバー素材４９に対して、図２０・２１のＡに示すように、始端側切刃収納部２１Ａでは、凹溝１６ａと対向する面２４に切り込みを入れないように、切刃３７を底面２２に食い込ませ、ついで、カッタ３５を移動させて、図２０のＢ・Ｃや図２１のＢに示すように、交差側部位１９や直線状部位１７・１８の凹溝１６ａを、切刃３７によって形成し、終端側切刃収納部２１Ｂでは、入口側壁面２４を離脱した切刃３７を、傾斜面２３に切れ目を入れない状態で、底面２２に食い込ませた状態で壁面２４から離脱させ、さらに、その後、底面２２から離脱させるように切刃３７を引き抜いて、直線状部位１７・１８や交差側部位１９の各凹溝１６ａを形成している。   In this airbag cover 50, the cutter 35 is not only used for the cutting blade storage portions 21 </ b> A and 21 </ b> B of the T-shaped intersection 20 but also for the cutting blade storage portions 21 </ b> A and 21 </ b> B of the linear portions 17 and 18. The cutting edge 37 bites into the bottom surface 22 to form the concave groove 16a. That is, with respect to the cover material 49 set on the setting table J, as shown in A of FIGS. 20 and 21, in the starting edge side cutting blade storage portion 21A, the surface 24 facing the concave groove 16a is not cut. Then, the cutting edge 37 is made to bite into the bottom surface 22 and then the cutter 35 is moved so that the grooves 19 in the intersecting side portion 19 and the straight portions 17 and 18 as shown in FIGS. 16a is formed by the cutting edge 37, and in the end-side cutting edge storage portion 21B, the cutting edge 37 that has separated from the inlet side wall surface 24 is bitten into the bottom surface 22 without being cut into the inclined surface 23. The cutting edge 37 is pulled out so as to be detached from the wall surface 24 and then from the bottom surface 22, thereby forming the concave grooves 16 a in the linear portions 17, 18 and the intersecting side portion 19.

この第３実施形態のエアバッグカバー５０の製造方法では、使用するカッタ３５の切刃３７が、先端３７ａから元部３７ｂ側にかけて、切り込み加工時の移動方向に向かって張り出すように、傾斜して形成されている。さらに、終端側切刃収納部２１Ｂが、交差側部位１９側の底面２２を、交差側部位１９を切り込み加工するカッタ３５の移動方向と平行な平坦面として、交差側部位１９から直線状部位１８に向かう方向で対向する位置に配置されている切刃収納部２１Ｂの面２３を、交差側部位１９から離れつつ切刃収納部２１Ｂの底面２２からも離れる傾斜面としている。 In the method of manufacturing the airbag cover 50 according to the third embodiment, the cutting blade 37 of the cutter 35 to be used is inclined so as to protrude from the tip 37a toward the base portion 37b toward the moving direction during the cutting process. Is formed. Further, the terminal-side cutting blade storage portion 21 </ b> B uses the bottom surface 22 on the crossing side part 19 side as a flat surface parallel to the moving direction of the cutter 35 that cuts the crossing side part 19, and extends from the crossing side part 19 to the linear part 18. The surface 23 of the cutting blade storage portion 21B disposed at a position facing in the direction toward the surface is an inclined surface that is separated from the bottom surface 22 of the cutting blade storage portion 21B while being away from the intersecting side portion 19.

そのため、このような構成では、破断予定部１６における交差側部位１９を切り込み加工するカッタ３５が、切刃３７の先端３７ａを切刃収納部２１の平坦な底面２２に食い込ませた状態としていても、切刃３７における先端３７ａから離れる元部３７ｂ側部位では、傾斜面２３から離れた位置に配置させることができる。すなわち、平坦な底面２２に切刃３７の先端３７ａを食い込ませておくことが可能となり、切刃収納部２１の平坦な底面２２として、切刃３７を食い込ませて肉厚Ｔ２を厚くすることができ、切刃収納部２１Ｂの薄肉化を防止できて、エアバッグカバー５０の表面側における切刃収納部２１Ｂの領域に、ヒケやツヤムラが生ずることを防止できる。勿論、このような作用・効果は、交差側部位１９の始端側切刃収納部２１Ａや直線状部位１７・１８の切刃収納部２１Ａ・２１Ｂでも同様である。   Therefore, in such a configuration, even when the cutter 35 that cuts the intersecting side portion 19 in the planned fracture portion 16 is in a state where the tip 37a of the cutting blade 37 is bitten into the flat bottom surface 22 of the cutting blade storage portion 21. The base 37b side portion of the cutting edge 37 away from the tip 37a can be disposed at a position away from the inclined surface 23. That is, the tip 37a of the cutting blade 37 can be bitten into the flat bottom surface 22, and the cutting blade 37 can be bitten as the flat bottom surface 22 of the cutting blade storage portion 21 to increase the thickness T2. In addition, it is possible to prevent the cutting blade storage portion 21B from being thinned, and to prevent the occurrence of sink marks and gloss unevenness in the region of the cutting blade storage portion 21B on the front surface side of the airbag cover 50. Needless to say, such actions and effects are the same in the cutting edge storage portion 21A of the intersecting side portion 19 and the cutting blade storage portions 21A and 21B of the linear portions 17 and 18.

さらに、第３実施形態では、直線状部位１７・１８が、カッタ３５を使用して切り込み加工される部位とするとともに、Ｔ字状交差部２０の切刃収納部２１の平坦な底面２２の領域を通るように、配設されている。   Furthermore, in the third embodiment, the straight portions 17 and 18 are portions that are cut using the cutter 35, and the flat bottom surface 22 region of the cutting blade storage portion 21 of the T-shaped intersection portion 20 is used. It is arranged to pass through.

このような構成では、交差側部位１９と直線状部位１８とが、共に、切刃収納部２１の平坦な底面２２に食い込むように切り込み加工されていたり、一方だけが、切刃収納部２１の平坦な底面２２に食い込むように切り込み加工されていても、膨張するエアバッグに押されて生ずる交差側部位１９の破断が、直線状部位１８を越え、さらに、切刃収納部２１Ｂの傾斜面２３を越えて進行することを防止できる。すなわち、交差側部位１９の切れ目１６ａの深さＤ１が、切刃収納部２１Ｂの底面２２に到達しない深さであれば、直線状部位１８の切れ目１６ａの深さが、切刃収納部２１Ｂの底面２２に到達していない、あるいは、到達している、に拘わらず、膨張するエアバッグに押されて生ずる交差側部位１９の破断は、切刃収納部２１Ｂの部位で、進行が停止される。また、図２０に示すように、交差側部位１９の切れ目１６ａの深さＤ１が、切刃収納部２１Ｂの底面２２の深さＤ０を越えている場合あって、交差側部位１９の切れ目１６ａが、切刃収納部２１Ｂの底面２２の領域内で、かつ、直線状部位１８の領域を越えて（底面２２の領域に位置する直線状部位１８の切れ目１６ａを越えて）形成されていても、その延長上には、切刃収納部２１Ｂの底面２２より肉厚を急激に厚くするような傾斜面２３の部位が形成されているため、膨張するエアバッグに押されて生ずる交差側部位１９の破断が、切刃収納部２１Ｂの傾斜面２３を越えて進行することを防止できる。勿論、始端側切刃収納部２１Ａでも、底面２２より肉厚を急激に厚くするような対向面２４の部位が形成されているため、交差側部位１９の切れ目１６ａが、切刃収納部２１Ａの底面２２の領域内で、かつ、直線状部位１７の領域を越えて（底面２２の領域に位置する直線状部位１７の切れ目１６ａを越えて）形成されていても、膨張するエアバッグに押されて生ずる交差側部位１９の破断が、切刃収納部２１Ａの対向面２４を越えて進行することを防止できる。ちなみに、底面２２の領域に位置する直線状部位１７・１８の切れ目１６ａは、上記の場合、図２１に示すように、切刃収納部２１の底面２２に食い込む深さとしていても、あるいは、図２２に示すように、切刃収納部２１の底面２２に食い込まない深さであっても、どちらでもよい。   In such a configuration, the intersecting side portion 19 and the straight portion 18 are both cut so as to bite into the flat bottom surface 22 of the cutting blade storage portion 21, or only one of the cutting blade storage portion 21 is cut. Even if it is cut so as to bite into the flat bottom surface 22, the breakage of the intersecting side portion 19 caused by being pushed by the inflating airbag exceeds the linear portion 18, and further, the inclined surface 23 of the cutting blade storage portion 21 </ b> B. It is possible to prevent progressing beyond. That is, if the depth D1 of the cut 16a of the crossing side portion 19 is a depth that does not reach the bottom surface 22 of the cutting blade storage portion 21B, the depth of the cut 16a of the linear portion 18 is the depth of the cutting blade storage portion 21B. Regardless of whether or not the bottom surface 22 has been reached, the breakage of the crossing side portion 19 caused by being pushed by the inflating airbag stops at the portion of the cutting blade storage portion 21B. . Further, as shown in FIG. 20, there is a case where the depth D1 of the cut 16a of the intersecting side portion 19 exceeds the depth D0 of the bottom surface 22 of the cutting blade storage portion 21B. Even if it is formed within the region of the bottom surface 22 of the cutting blade storage portion 21B and beyond the region of the linear portion 18 (beyond the cut 16a of the linear portion 18 located in the region of the bottom surface 22), On the extension, a portion of the inclined surface 23 is formed so that the wall thickness is sharply increased from the bottom surface 22 of the cutting blade storage portion 21B. The breakage can be prevented from proceeding beyond the inclined surface 23 of the cutting blade storage portion 21B. Of course, since the part of the opposing surface 24 that is thicker than the bottom surface 22 is also formed in the starting edge side cutting blade storage part 21A, the cut 16a of the crossing side part 19 is formed on the cutting edge storage part 21A. Even if it is formed within the region of the bottom surface 22 and beyond the region of the linear portion 17 (beyond the cut 16a of the linear portion 17 located in the region of the bottom surface 22), it is pushed by the inflating airbag. Thus, it is possible to prevent the breakage of the intersecting side portion 19 from proceeding beyond the facing surface 24 of the cutting blade storage portion 21A. Incidentally, the cut 16a of the linear portions 17 and 18 located in the region of the bottom surface 22 may have a depth of biting into the bottom surface 22 of the cutting blade storage portion 21, as shown in FIG. As shown in FIG. 22, either the depth that does not bite into the bottom surface 22 of the cutting blade storage portion 21 may be used.

なお、各実施形態では、破断予定部１６として、Ｔ字状交差部２０を二つ配設させたようなＨ字形状の場合を示したが、一方の直線状部位１７を備えていない破断予定部１６を備えたエアバッグカバーに、本発明を適用できる。   In each of the embodiments, the H-shaped case in which two T-shaped intersections 20 are arranged as the planned fracture portion 16 is shown, but the planned fracture is not provided with one linear portion 17. The present invention can be applied to an airbag cover provided with the portion 16.

また、第２・３実施形態では、直線状部位１７・１８の両端にも、切刃収納部４１・２１を設けた場合を示したが、交差側部位２０から離れるにしたがって、肉厚を厚くするように、カッタ３５を操作して、エアバッグに押されて破断するヒンジ部１５側の端末が、延長しないように、構成してもよい。   Further, in the second and third embodiments, the case where the cutting blade storage portions 41 and 21 are provided at both ends of the linear portions 17 and 18 is shown, but the thickness increases as the distance from the intersecting portion 20 increases. Thus, the cutter 35 may be operated so that the terminal on the side of the hinge portion 15 that is pushed and broken by the airbag does not extend.

さらに、第２・３実施形態のように、直線状部位１７・１８も切り込み加工する凹溝１６ａから形成する構成において、それらの部位を加工するカッタ３５自体やその保持機構等が壁部３３ｃ・３３ｄと干渉する虞れがある場合には、図７〜１０に示すエアバッグカバー１０Ａ・１０Ｂのように、突条部２８ａやリブ２８ｂを設けて、直線状部位１７・１８と壁部３３ｃ・３３ｄとの間の領域２８を広げるように構成してもよい。   Further, as in the second and third embodiments, in the configuration in which the linear portions 17 and 18 are also formed from the recessed grooves 16a, the cutter 35 itself that processes these portions, its holding mechanism, and the like are provided in the wall portion 33c. When there is a possibility of interference with 33d, as shown in airbag covers 10A and 10B shown in FIGS. 7 to 10, protrusions 28a and ribs 28b are provided, and linear portions 17 and 18 and wall portions 33c and You may comprise so that the area | region 28 between 33d may be expanded.

さらにまた、直線状部位やその直線状部位に交差するように配設される交差側部位は、その全域を直線状としなくともよく、例えば、図２３・２４に示すエアバッグカバー５０Ａ・５０Ｂに示すように、直線状部位１７・１８の間の交差側部位１９を曲線状としていもよい。   Furthermore, the linear part and the intersecting part disposed so as to intersect the linear part do not have to be linear throughout, for example, the airbag covers 50A and 50B shown in FIGS. As shown, the crossing side portion 19 between the straight portions 17 and 18 may be curved.

また、各実施形態では、切り込み加工する切刃を有した加工具として、超音波カッタ３５を例示したが、通常のコールドカッタや細い棒状のエンドミル等を使用して、切れ目１６ａを形成してもよい。但し、切粉や切屑を発生させずに、切れ目を入れて凹溝１６ａを形成できるカッタを使用すれば、破断時に応力集中が生じ易い切れ目１６ａを形成できるとともに、切粉等の処理も不要となって、好ましい。なお、エンドミル等の切削加工によって凹溝状の切れ目１６ａを形成する場合には、その開口の幅寸法は、エンドミル等の回転する切刃が切刃収納部に収納される際に、不要な切れ目を設けることのない寸法として、０．３〜１．５ｍｍ程度とすることが望ましい。   Moreover, in each embodiment, although the ultrasonic cutter 35 was illustrated as a processing tool which has the cutting blade to cut, even if it forms the cut 16a using a normal cold cutter, a thin rod-shaped end mill, etc. Good. However, if a cutter that can cut and form the concave groove 16a without generating chips or chips can be used, the cut 16a that is likely to cause stress concentration at the time of breakage can be formed, and processing of chips and the like is unnecessary. It is preferable. When the groove 16a is formed by cutting with an end mill or the like, the width of the opening is such that an unnecessary cut when the rotating cutting blade such as an end mill is stored in the cutting blade storage portion. It is desirable that the dimension without providing the thickness is about 0.3 to 1.5 mm.

さらに、各実施形態では、助手席用エアバッグ装置Ｓに使用されるインパネ２を別体としたエアバッグカバー１０・４０・５０について説明したが、インパネと一体成形するエアバッグカバーに本発明を適用してもよく、さらに、他の運転席用やシートの側面に設けるエアバッグ装置等のエアバッグカバーに、本発明を適用してもよい。   Further, in each of the embodiments, the airbag cover 10, 40, 50 in which the instrument panel 2 used in the passenger airbag device S is separated is described. However, the present invention is applied to an airbag cover integrally formed with the instrument panel. Further, the present invention may be applied to an airbag cover such as an airbag device provided for another driver's seat or on the side of the seat.

本発明の第１実施形態で製造するエアバッグカバーの使用状態を示す斜視図である。It is a perspective view which shows the use condition of the airbag cover manufactured in 1st Embodiment of this invention. 第１実施形態のエアバッグカバーが使用されているエアバッグ装置の断面図であり、図１のII−II部位に対応する。It is sectional drawing of the airbag apparatus in which the airbag cover of 1st Embodiment is used, and respond | corresponds to the II-II site | part of FIG. 第１実施形態のエアバッグカバーの部分底面図であり、破断予定部付近を示す。It is a partial bottom view of the airbag cover of 1st Embodiment, and shows the fracture | rupture scheduled part vicinity. 第１実施形態のエアバッグカバーの部分省略縦断面図であり、図３のIV−IV部位に対応する。FIG. 4 is a partially omitted vertical cross-sectional view of the airbag cover of the first embodiment, corresponding to the IV-IV part of FIG. 3. 第１実施形態のエアバッグカバーの部分省略縦断面図であり、図３のＶ−Ｖ部位に対応する。FIG. 4 is a partially omitted vertical cross-sectional view of the airbag cover of the first embodiment and corresponds to a VV portion in FIG. 3. 第１実施形態のエアバッグカバーの切り込み加工を説明する図である。It is a figure explaining the cutting process of the airbag cover of 1st Embodiment. 第１実施形態の変形例を示すエアバッグカバーの部分底面図である。It is a partial bottom view of the airbag cover which shows the modification of 1st Embodiment. 図７に示すエアバッグカバーの部分省略縦断面図であり、図７のVIII−VIII部位に対応する。FIG. 8 is a partially omitted vertical cross-sectional view of the airbag cover shown in FIG. 7 and corresponds to the VIII-VIII portion of FIG. 7. 第１実施形態の他の変形例を示すエアバッグカバーの部分底面図である。It is a partial bottom view of the airbag cover which shows the other modification of 1st Embodiment. 図９に示すエアバッグカバーの部分省略縦断面図であり、図９のＸ−Ｘ部位に対応する。FIG. 10 is a partially omitted vertical cross-sectional view of the airbag cover shown in FIG. 9 and corresponds to a section XX in FIG. 9. 第２実施形態で製造するエアバッグカバーの部分底面図であり、破断予定部付近を示す。It is a fragmentary bottom view of the airbag cover manufactured in 2nd Embodiment , and shows the fracture | rupture planned part vicinity. 第２実施形態のエアバッグカバーの部分省略縦断面図であり、図１１のXII−XII部位に対応する。FIG. 12 is a partially omitted vertical cross-sectional view of the airbag cover of the second embodiment and corresponds to the XII-XII portion of FIG. 11. 第２実施形態のエアバッグカバーの部分省略縦断面図であり、図１のXIII−XIII部位に対応する。FIG. 4 is a partially omitted vertical cross-sectional view of an airbag cover according to a second embodiment and corresponds to the XIII-XIII portion of FIG. 1. 第２実施形態のエアバッグカバーの交差側部位の切り込み加工を示す図である。It is a figure which shows the cutting process of the cross | intersection side part of the airbag cover of 2nd Embodiment. 第２実施形態のエアバッグカバーの直線状部位の切り込み加工を示す図である。It is a figure which shows the cutting process of the linear site | part of the airbag cover of 2nd Embodiment. 第２実施形態のエアバッグカバーの直線状部位の切り込み加工における変形例を示す図である。It is a figure which shows the modification in the cutting process of the linear site | part of the airbag cover of 2nd Embodiment. 第３実施形態で製造するエアバッグカバーの部分底面図であり、破断予定部付近を示す。It is a partial bottom view of the airbag cover manufactured in 3rd Embodiment , and shows the fracture | rupture plan vicinity vicinity. 第３実施形態のエアバッグカバーの部分省略縦断面図であり、図１７のXVIII−XVIII部位に対応する。FIG. 18 is a partially omitted vertical cross-sectional view of the airbag cover of the third embodiment, corresponding to the XVIII-XVIII portion of FIG. 17. 第３実施形態のエアバッグカバーの部分省略縦断面図であり、図１７のXIX−XIX部位に対応する。FIG. 18 is a partially omitted vertical cross-sectional view of an airbag cover according to a third embodiment, corresponding to the XIX-XIX portion of FIG. 17. 第３実施形態のエアバッグカバーの交差側部位の切り込み加工を示す図である。It is a figure which shows the cutting process of the cross | intersection side part of the airbag cover of 3rd Embodiment. 第３実施形態のエアバッグカバーの直線状部位の切り込み加工を示す図である。It is a figure which shows the cutting process of the linear site | part of the airbag cover of 3rd Embodiment. 第３実施形態のエアバッグカバーの直線状部位の切り込み加工における変形例を示す図である。It is a figure which shows the modification in the cutting process of the linear part of the airbag cover of 3rd Embodiment. 第３実施形態のエアバッグカバーの変形例を示す部分底面図である。It is a partial bottom view which shows the modification of the airbag cover of 3rd Embodiment. 第３実施形態のエアバッグカバーの他の変形例を示す部分底面図である。It is a partial bottom view which shows the other modification of the airbag cover of 3rd Embodiment.

４…エアバッグ、
１０・１０Ａ・１０Ｂ・４０・５０・５０Ａ・５０Ｂ…エアバッグカバー、
１２ａ…突出用開口、
１６…破断予定部、
１６ａ…（切れ目・切り込み）凹溝、
１８…直線状部位、
１９…交差側部位、
２０…Ｔ字状交差部、
２１・４１…切刃収納部、
２２…底面、
２３…（対向する）面・傾斜面、
３５…カッタ、
３７…切刃、
３７ａ…先端、
３７ｂ…元部。 4 ... Airbag,
10 · 10A · 10B · 40 · 50 · 50A · 50B… Airbag cover,
12a ... projecting opening,
16 ... planned to break,
16a ... (cut / cut) concave groove,
18 ... linear part,
19 ... intersection part,
20 ... T-shaped intersection,
21.41 ... Cutting blade storage,
22 ... bottom surface,
23 ... (opposite) surface / slope,
35 ... Cutter,
37 ... Cutting blade,
37a ... tip,
37b ... The original part.

Claims (2)

折り畳まれたエアバッグを覆い、かつ、膨張する前記エアバッグに押されて破断して前記エアバッグを突出させる突出用開口を形成可能な線状に延びる薄肉の破断予定部を備えて、型成形によって形成される合成樹脂製とし、
前記破断予定部が、裏面側から表面側に凹む凹溝を設けて形成されるとともに、一方の直線状部位に対して交差側部位を平面視の状態でＴ字状に交差させるＴ字状交差部を備え、さらに、成形後に、加工具を移動させて前記加工具の切刃により切れ目を入れる切り込み加工によって、形成される部位を備えて構成され、
前記破断予定部の少なくとも前記交差側部位が、切り込み加工によって形成される部位としているエアバッグカバーの製造方法であって、
前記加工具が、カッタから構成されて、
前記カッタの切刃が、先端から元部側にかけて、切り込み加工時の移動方向に向かって張り出すように、傾斜して形成され、
成形後の前記Ｔ字状交差部の部位に、前記エアバッグカバーの表面側に凹む切刃収納部が配設され、
該切刃収納部が、
前記Ｔ字状交差部に向けて前記交差側部位を切り込み加工しつつ移動する前記カッタの切刃を前記交差側部位から離脱させた際に、前記交差側部位から前記直線状部位に向かう方向で対向する位置に配置される前記切刃収納部の面に対して切れ目を入れない状態として、前記切刃を収納可能に、
前記交差側部位側の底面を、前記交差側部位を切り込み加工する前記カッタの移動方向と平行な平坦面として、前記交差側部位から前記直線状部位に向かう方向で対向する位置に配置されている前記切刃収納部の面を、前記交差側部位から離れつつ前記切刃収納部の前記底面からも離れる傾斜面として、
形成されていることを特徴とするエアバッグカバーの製造方法。 Die-molding comprising a thinly-scheduled breakable portion that extends in a linear shape that covers a folded airbag and that can be pushed by the inflating airbag to break and form a projecting opening that projects the airbag Made of synthetic resin formed by
The to-be-ruptured portion is formed by providing a concave groove that is recessed from the back surface side to the front surface side, and intersects one linear portion with a T-shaped intersection in a T-shape in a plan view. Further comprising, after forming, a part to be formed by incision processing by moving the processing tool and making a cut with the cutting blade of the processing tool after molding,
The airbag cover manufacturing method , wherein at least the intersecting side portion of the planned breaking portion is a portion formed by cutting,
The processing tool is composed of a cutter,
The cutting blade of the cutter is formed to be inclined so as to protrude from the tip to the base side toward the moving direction at the time of cutting,
A cutting blade storage portion that is recessed on the surface side of the airbag cover is disposed at the portion of the T-shaped intersection after molding,
The cutting blade storage part is
When the cutting edge of the cutter that moves while cutting the crossing side part toward the T-shaped crossing part is detached from the crossing side part, in the direction from the crossing side part toward the linear part. As a state that does not make a cut with respect to the surface of the cutting blade storage portion disposed at the opposite position, the cutting blade can be stored.
The bottom surface on the side of the intersecting side is disposed as a flat surface parallel to the moving direction of the cutter that cuts the intersecting side, and is disposed at a position facing the linear portion from the intersecting side. As an inclined surface that separates the surface of the cutting blade storage portion from the bottom surface of the cutting blade storage portion while leaving the surface of the cutting blade storage portion,
A method for manufacturing an airbag cover , wherein the airbag cover is formed. 前記直線状部位が、前記カッタを使用して切り込み加工される部位とするとともに、前記切刃収納部の平坦な前記底面の領域を通るように配設されていることを特徴とする請求項１に記載のエアバッグカバーの製造方法。 Together with the linear sites, a site to be processed cut by using the cutter, claim 1, characterized in that it is arranged to pass through the area of the flat the bottom surface of the cutting blade housing portion The manufacturing method of the airbag cover as described in 1 ..
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0427638A (en) * 1990-05-24 1992-01-30 Takata Kk Air bag storage cover
JPH06336145A (en) * 1993-03-30 1994-12-06 Takata Kk Module cover for air bag device
JP2005022453A (en) * 2003-06-30 2005-01-27 Takata Corp Air bag cover and air bag module
JP2005022452A (en) * 2003-06-30 2005-01-27 Takata Corp Method for manufacturing air bag cover, air bag cover, and air bag module
JP2005289254A (en) * 2004-04-01 2005-10-20 Takata Corp Manufacturing method of air bag cover, air bag cover and air bag module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0427638A (en) * 1990-05-24 1992-01-30 Takata Kk Air bag storage cover
JPH06336145A (en) * 1993-03-30 1994-12-06 Takata Kk Module cover for air bag device
JP2005022453A (en) * 2003-06-30 2005-01-27 Takata Corp Air bag cover and air bag module
JP2005022452A (en) * 2003-06-30 2005-01-27 Takata Corp Method for manufacturing air bag cover, air bag cover, and air bag module
JP2005289254A (en) * 2004-04-01 2005-10-20 Takata Corp Manufacturing method of air bag cover, air bag cover and air bag module

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