JP3680196B2 - Hollow double wall structure and manufacturing method thereof - Google Patents

Hollow double wall structure and manufacturing method thereof Download PDF

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Publication number
JP3680196B2
JP3680196B2 JP36950397A JP36950397A JP3680196B2 JP 3680196 B2 JP3680196 B2 JP 3680196B2 JP 36950397 A JP36950397 A JP 36950397A JP 36950397 A JP36950397 A JP 36950397A JP 3680196 B2 JP3680196 B2 JP 3680196B2
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Prior art keywords
wall
rod
reinforcing member
hollow double
shaped reinforcing
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JPH11192655A (en
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功 木村
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Kyoraku Co Ltd
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Kyoraku Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2008—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements inside the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2017—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements outside the article

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  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、熱可塑性プラスチックをブロー成形することにより得られる中空二重壁構造体、およびその製造方法に関する。
【０００２】
【従来の技術】
従来から、建築物の内装壁、パーティション、扉、あるいは自動車のフロアトランクリッドやリヤーパーセルシュエルフなどを構成するプラスチック製の中空二重壁構造体において、中空部内に形成するインナーリブに平板状でかつ曲面状の棒状体をインサートすることにより、強度および剛性を向上させる技術は、特開平９−１５５９５７号公報に記載されている。
【０００３】
【発明が解決しようとする課題】
前掲の特開平９−１５５９５７号公報に記載されている技術は、本出願人が開発したものであるが、その後の検討の結果、主にブロー成形上、次のような問題点のあることが分かった。
【０００４】
すなわち、特開平９−１５５９５７号公報に記載されている技術においては、ブロー成形される中空二重壁構造体にインサートされる棒状体が金属製であって冷却時に生じる樹脂との収縮差が２％以上と大きいので、例えば、長さが８００ｍｍの棒状体を中空二重壁構造体にインサートすると、冷却時に両端で１６ｍｍ以上の収縮差が発生し、この収縮差により、中空二重壁構造体が変形したり破損したりすることである。
【０００５】
そこで、本発明は、上述のような課題を解決しようとするものであって、中空部内に配設する棒状補強体を、その両端を棒状補強部材に対する中空二重構造体の変形歪を吸収する機能を備えた保持部材を介して中空二重壁構造体に保持することにより、ブロー成形後において中空二重壁構造体が冷却収縮する過程で、棒状補強体に対する変形歪を保持部材で吸収することができ、金属製の棒状補強部材をインサートすることにより強度および剛性の向上を図ったものであっても成形後の冷却収縮による変形歪みを生じない中空二重壁構造体、およびその製造方法を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、本発明に係る中空二重壁構造体は、表壁と、表壁に間隔をおいて対向する裏壁と、表壁および裏壁との間に中空部を形成する周囲壁とで構成される中空二重壁構造体であって、中空部内には棒状補強部材が配設されるとともに、裏壁の棒状補強部材の端部に対応する部位には棒状補強部材を中空二重壁構造体に保持する保持部材を有しており、この保持部材は棒状補強部材に対する中空二重構造体の変形歪を吸収する機能を備えていることを特徴とするものである。
【０００７】
本発明に係る中空二重壁構造体においては、それぞれ次のように構成するのが好適である。すなわち、棒状補強部材の周囲は、少なくとも裏壁と一体に連なる包囲壁で包囲されていること、棒状補強部材の周囲を包囲する包囲壁は、裏壁の表面側に棒状補強部材の一部を露出する溝部を有していること、棒状補強部材を中空二重壁構造体に保持する保持部材は、棒状補強部材をスライド自在に嵌挿支持する構成、あるいは変形歪を吸収する材料で構成されていることである。
【０００８】
また、本発明に係る中空二重壁構造体の製造方法は、表壁と、表壁に間隔をおいて対向する裏壁と、表壁および裏壁との間に中空部を形成する周囲壁とで構成される中空二重壁構造体をブロー成形する方法であって、一対の分割金型のうち裏壁を形成する金型のキャビティに、両端に保持部材を装着した棒状補強部材をインサートしてブロー成形することを特徴とする。
【０００９】
本発明に係る中空二重壁構造体の製造方法においては、それぞれ次のような手段をとることが好適である。すなわち、裏壁を形成する金型のキャビティに、保持部材の嵌合保持機構を備えており、棒状補強部材の両端に装着した保持部材を上記金型のキャビティに嵌合保持すること、保持部材は棒状補強部材をスライド自在に支持する構成であり、保持部材は棒状補強体の位置決め構造を有していることである。
【００１０】
【発明の実施の形態】
図１ないし図４は本発明の一実施の形態に係る中空二重壁構造体を示し、図１は裏面側から見た斜視図、図２は図１の一部の拡大断面図、図３は保持部材の側面図、図４は図３に示す保持部材の正面図である。
【００１１】
図５は本発明の他の実施の形態に係る図２に対応する部分の拡大断面図、図６は図５の一部の斜視図である。
【００１２】
図７ないし図１１は本発明の一実施の形態に係る中空二重壁構造体のブロー成形態様を示し、図７は型閉前の態様を示す断面図、図８は図７の破線円内の拡大断面図、図９は冷却後の態様を示す図７の破線円内の拡大断面図、図１０は図８のＡ−Ａ線断面図、図１１は図８のＢ−Ｂ線断面図である。
【００１３】
図１において、１は中空二重壁構造体である。この中空二重壁構造体１はパネル状を成しており、２は表壁、３は裏壁、４は周囲壁であって、図２に示すように、表壁２に対して裏壁３は間隔をおいて対向しており、周囲壁４によって表壁２および裏壁３との間に中空部５が形成されている。
【００１４】
上記中空二重壁構造体１の中空部５内には、金属製パイプの棒状補強部材６が配設されるとともに、この棒状補強部材６は裏壁３と一体に連なる包囲壁７でその周面が包囲されている。
【００１５】
図１に示すように、棒状補強部材６の両端にはそれに対応して保持部材８，８が設けられており、棒状補強部材６の両端は保持部材８，８を介して包囲壁７に保持されている。
【００１６】
上記保持部材８は、図２ないし図４に示すように、発泡材により構成されており、その一端には棒状補強部材７に嵌挿する嵌挿突部９を有し、かつ裏壁４側には嵌合溝１０を有している。この嵌合溝１０は、後述するようにブロー成形の分割金型のうち裏壁３を成形する金型のキャビティに嵌合保持するためのものである。
【００１７】
上記保持部材８は、発泡材で構成されていて変形自在のものであるから、棒状補強部材６に対する中空二重構造体１の変形歪を吸収する機能を備えている。保持部材８を構成する発泡材は、発泡ウレタン等である。
【００１８】
図５および図６には、本発明の他の実施の形態が示されている。この実施の形態においては、保持部材８が棒状補強部材６をスライド自在に嵌挿支持するする構成のものである。すなわち、１１は棒状補強部材６の嵌挿穴部であり、棒状補強部材６はこの嵌挿穴部１１に嵌挿され、長手方向にスライド自在に支持される。上記保持部材８には、後述するようにブロー成形の分割金型のうち裏壁３を成形する金型のキャビティに嵌合保持する嵌合溝１０が、さらに、包囲壁７に埋め込まれる埋込突条１２，１２を有している。
【００１９】
この実施の形態においては、保持部材８に対して棒状補強部材６がスライド自在であるから、両保持部材８，８間の棒状補強部材６の有効長が変化することにより、棒状補強部材６に対する中空二重構造体１の変形歪を吸収する機能を備えている。
【００２０】
図５に示す実施の形態では、包囲壁７の裏壁３側に、棒状補強部材６の周面の一部を外部に露出させる溝部１２が形成されている。
【００２１】
本発明に係る中空二重壁構造体１は、ＡＢＳ樹脂、変性ポリフェニレンオキサイド樹脂、ポリカーボネート樹脂、ポリアミド樹脂、ポリプロピレン樹脂、ポリエチレン樹脂等、ブロー成形可能な熱可塑性樹脂で構成される。また、棒状補強部材６は金属製やエンジニアリングプラスチックなどの剛性の高い樹脂などにより構成されるものであり、必要に応じて表面の滑り性を良くするため、メッキなどの表面処理を施すものとする。
【００２２】
本発明に係る中空二重壁構造体１は、図７ないし図１１に示すようにブロー成形される。図７に示すように、１３は表壁２を成形する一方の分割金型、１４は裏壁３を成形する他方の分割金型であり、他方の分割金型１４のキャビティ１５には棒状補強部材６の両端に嵌装した保持部材８，８が嵌合保持され、棒状補強部材６とその両端の保持部材８，８がインサートされる。図６において１６は押出ダイ、１７はパリソンである。
【００２３】
図７に示すブロー成形態様により、図１ないし図４に示す中空二重壁構造体１がブロー成形されるが、ブロー成形後の冷却により、金属製の棒状補強部材６に対して中空二重壁構造体１が大きく収縮しても、その収縮歪は発泡材からなる保持部材８，８の変形、またはスライド自在に嵌挿支持されている棒状補強部材６の有効長の変化によって吸収され、中空二重壁構造体１には冷却収縮による変形歪みが生じない。
【００２４】
また、図５に示すように、裏壁３側に棒状補強部材６の周面の一部を外部に露出させる溝部１２が形成されているものでは、中空二重壁構造体１の廃棄時に、中空二重壁構造体１に棒状補強材６がインサートされていることを容易に認識でき、その分別を確実かつ容易にできる。その際、溝部１２に割道具を噛ませることにより、中空二重壁構造体１を簡単に割ることができるので、分別作業がいっそう容易である。
【００２５】
図８および図９に示すように、棒状補強部材６がスライド自在に嵌挿支持する構成の保持部材８においては、嵌挿穴部１１内の奥面に、棒状補強部材６の位置決めのための弾性針状体１８を立設してある。棒状補強部材６はその両端に保持部材８，８を嵌挿すると弾性針状体１８に仮に支持されて位置決めが成され、この状態で他方の分割金型１４のキャビティ１５にインサートされる。したがって、ブロー成形時に棒状補強部材６および保持部材８，８が位置ずれを起こすことがない。
【００２６】
上記弾性針状体１８は、細い弾性体であるから、ブロー成形後の冷却により棒状補強部材６に対して中空二重壁構造体１が収縮すると、図９に示すように、弾性針状体１８が容易に屈曲するので、冷却収縮にともなう歪みの吸収に何ら支障が生じない。
【００２７】
【発明の効果】
本発明によれば、中空部内に配設する棒状補強体を、その両端を棒状補強部材に対する中空二重構造体の変形歪を吸収する機能を備えた保持部材を介して中空二重壁構造体に保持することにより、ブロー成形後において中空二重壁構造体が冷却収縮する過程で、棒状補強体に対する変形歪を保持部材で吸収することができ、金属製の棒状補強部材をインサートすることにより強度および剛性の向上を図ったものであっても成形後の冷却収縮による変形歪みを生じない中空二重壁構造体、およびその製造方法を提供することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る中空二重壁構造体を裏面側から見た斜視図である。
【図２】図１の一部の拡大断面図である。
【図３】保持部材の側面図である。
【図４】図３に示す保持部材の正面図である。
【図５】本発明の他の実施の形態に係る図２に対応する部分の拡大断面図である。
【図６】図５の一部の斜視図である。
【図７】本発明の一実施の形態に係る中空二重壁構造体のブロー成形態様を示し、型閉め前の態様を示す断面図である。
【図８】図７の破線円内の拡大断面図である。
【図９】冷却後の態様を示す図７の破線円内の拡大断面図である。
【図１０】図８のＡ−Ａ線断面図である。
【図１１】図８のＢ−Ｂ線断面図である。
【符号の説明】
１ 中空二重壁構造体
２ 表壁
３ 裏壁
４ 周囲壁
５ 中空部
６ 棒状補強部材
７ 包囲壁
８，８ 保持部材
９ 嵌挿突部
１０ 嵌合溝
１１ 嵌挿穴部
１２，１２ 埋込突条
１３ 一方の分割金型
１４ 他方の分割金型
１５ キャビティ
１６ 押出ダイ
１７ パリソン
１８ 弾性針状体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow double wall structure obtained by blow molding a thermoplastic and a method for producing the same.
[0002]
[Prior art]
Conventionally, a plastic hollow double wall structure that constitutes an interior wall, partition, door, or automobile floor trunk lid, rear parcel schelf, etc., has a flat inner rib formed in the hollow portion. A technique for improving strength and rigidity by inserting a curved rod-shaped body is described in Japanese Patent Application Laid-Open No. 9-155957.
[0003]
[Problems to be solved by the invention]
The technique described in the above-mentioned Japanese Patent Application Laid-Open No. 9-155957 has been developed by the present applicant, but as a result of subsequent studies, there are the following problems mainly in blow molding. I understood.
[0004]
That is, in the technique described in JP-A-9-155957, the rod-shaped body inserted into the blow-molded hollow double wall structure is made of metal, and the difference in shrinkage from the resin generated during cooling is 2 For example, when a rod-shaped body having a length of 800 mm is inserted into a hollow double wall structure, a shrinkage difference of 16 mm or more occurs at both ends during cooling, and the hollow double wall structure is caused by this shrinkage difference. Is deformed or damaged.
[0005]
Therefore, the present invention is intended to solve the above-described problems, and the rod-shaped reinforcing member disposed in the hollow portion absorbs deformation strain of the hollow double structure with respect to the rod-shaped reinforcing member at both ends. By holding the hollow double wall structure through a holding member having a function, the holding member absorbs the deformation strain of the rod-shaped reinforcing body in the process of cooling shrinkage after the blow molding. A hollow double-walled structure that can be deformed by cooling shrinkage after molding, even if the strength and rigidity are improved by inserting a metal bar-shaped reinforcing member, and a method for producing the same Is intended to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a hollow double wall structure according to the present invention forms a hollow portion between a front wall, a back wall facing the front wall with a space therebetween, and the front wall and the back wall. A hollow double-wall structure composed of a peripheral wall, and a rod-shaped reinforcing member is disposed in the hollow portion, and a rod-shaped reinforcing member is provided at a portion corresponding to the end of the rod-shaped reinforcing member on the back wall. It has the holding member hold | maintained at a hollow double wall structure, This holding member is provided with the function to absorb the deformation distortion of the hollow double structure with respect to a rod-shaped reinforcement member.
[0007]
The hollow double wall structure according to the present invention is preferably configured as follows. That is, the periphery of the rod-shaped reinforcing member is surrounded by at least an encircling wall continuous with the back wall, and the surrounding wall surrounding the bar-shaped reinforcing member has a part of the rod-shaped reinforcing member on the surface side of the back wall. The holding member for holding the bar-shaped reinforcing member in the hollow double wall structure having an exposed groove part is configured to be slidably inserted and supported by the bar-shaped reinforcing member or a material that absorbs deformation strain. It is that.
[0008]
The method for producing a hollow double-wall structure according to the present invention includes a front wall, a back wall facing the front wall with a space therebetween, and a peripheral wall that forms a hollow portion between the front wall and the back wall. A hollow double-wall structure comprising: a rod-shaped reinforcing member with holding members attached to both ends is inserted into a cavity of a mold that forms a back wall of a pair of split molds. And blow molding.
[0009]
In the method for producing a hollow double wall structure according to the present invention, it is preferable to take the following measures, respectively. In other words, the mold cavity forming the back wall is provided with a fitting holding mechanism for the holding member, and the holding members attached to both ends of the rod-shaped reinforcing member are fitted and held in the mold cavity, the holding member Is a structure which supports a rod-shaped reinforcement member so that sliding is possible, and the holding member has the positioning structure of a rod-shaped reinforcement body.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show a hollow double wall structure according to an embodiment of the present invention, FIG. 1 is a perspective view seen from the back side, FIG. 2 is an enlarged sectional view of a part of FIG. Is a side view of the holding member, and FIG. 4 is a front view of the holding member shown in FIG.
[0011]
FIG. 5 is an enlarged cross-sectional view of a portion corresponding to FIG. 2 according to another embodiment of the present invention, and FIG. 6 is a perspective view of a part of FIG.
[0012]
7 to 11 show a blow molding aspect of a hollow double wall structure according to an embodiment of the present invention, FIG. 7 is a cross-sectional view showing an aspect before mold closing, and FIG. FIG. 9 is an enlarged cross-sectional view in the broken-line circle of FIG. 7 showing the state after cooling, FIG. 10 is a cross-sectional view taken along the line AA in FIG. 8, and FIG. It is.
[0013]
In FIG. 1, 1 is a hollow double wall structure. The hollow double-wall structure 1 has a panel shape, 2 is a front wall, 3 is a back wall, 4 is a surrounding wall, and as shown in FIG. 3 is opposed to each other with a space therebetween, and a hollow portion 5 is formed between the front wall 2 and the back wall 3 by the peripheral wall 4.
[0014]
In the hollow portion 5 of the hollow double wall structure 1, a rod-shaped reinforcing member 6 of a metal pipe is disposed, and the rod-shaped reinforcing member 6 is surrounded by a surrounding wall 7 integrally connected to the back wall 3. The face is surrounded.
[0015]
As shown in FIG. 1, holding members 8 and 8 are provided corresponding to both ends of the rod-shaped reinforcing member 6, and both ends of the rod-shaped reinforcing member 6 are held by the surrounding wall 7 via the holding members 8 and 8. Has been.
[0016]
As shown in FIGS. 2 to 4, the holding member 8 is made of a foam material, and has an insertion protrusion 9 to be inserted into the rod-shaped reinforcing member 7 at one end, and the back wall 4 side. Has a fitting groove 10. As will be described later, the fitting groove 10 is for fitting and holding in a cavity of a mold for molding the back wall 3 in a blow mold divided mold.
[0017]
Since the holding member 8 is made of a foam material and is freely deformable, the holding member 8 has a function of absorbing deformation strain of the hollow double structure 1 with respect to the rod-shaped reinforcing member 6. The foam material constituting the holding member 8 is foamed urethane or the like.
[0018]
5 and 6 show another embodiment of the present invention. In this embodiment, the holding member 8 has a configuration in which the rod-like reinforcing member 6 is slidably inserted and supported. That is, 11 is an insertion hole portion of the rod-shaped reinforcing member 6, and the rod-shaped reinforcing member 6 is inserted into the insertion hole portion 11 and supported so as to be slidable in the longitudinal direction. As will be described later, the holding member 8 is further provided with a fitting groove 10 that fits and holds in a cavity of a mold for molding the back wall 3 among blow-molded divided molds. The protrusions 12 and 12 are provided.
[0019]
In this embodiment, since the rod-shaped reinforcing member 6 is slidable with respect to the holding member 8, the effective length of the rod-shaped reinforcing member 6 between the holding members 8, 8 changes, so that The hollow double structure 1 has a function of absorbing deformation strain.
[0020]
In the embodiment shown in FIG. 5, a groove portion 12 that exposes a part of the peripheral surface of the rod-shaped reinforcing member 6 to the outside is formed on the back wall 3 side of the surrounding wall 7.
[0021]
The hollow double wall structure 1 according to the present invention is made of a blow-moldable thermoplastic resin such as an ABS resin, a modified polyphenylene oxide resin, a polycarbonate resin, a polyamide resin, a polypropylene resin, or a polyethylene resin. Further, the rod-like reinforcing member 6 is made of a highly rigid resin such as metal or engineering plastic, and is subjected to a surface treatment such as plating in order to improve the surface slipperiness as necessary. .
[0022]
The hollow double wall structure 1 according to the present invention is blow-molded as shown in FIGS. As shown in FIG. 7, 13 is one split mold for molding the front wall 2, 14 is the other split mold for molding the back wall 3, and the cavity 15 of the other split mold 14 has a bar-shaped reinforcement. The holding members 8 and 8 fitted to both ends of the member 6 are fitted and held, and the rod-shaped reinforcing member 6 and the holding members 8 and 8 at both ends thereof are inserted. In FIG. 6, 16 is an extrusion die, and 17 is a parison.
[0023]
The hollow double wall structure 1 shown in FIGS. 1 to 4 is blow-molded by the blow molding mode shown in FIG. 7, but the hollow double-wall structure 1 shown in FIGS. Even if the wall structure 1 is greatly contracted, the contraction strain is absorbed by the deformation of the holding members 8 and 8 made of a foam material or the change in the effective length of the rod-shaped reinforcing member 6 that is slidably inserted and supported. The hollow double wall structure 1 is not deformed by cooling shrinkage.
[0024]
Further, as shown in FIG. 5, in the case where the groove portion 12 that exposes a part of the peripheral surface of the rod-shaped reinforcing member 6 to the outside is formed on the back wall 3 side, when the hollow double wall structure 1 is discarded, It can be easily recognized that the rod-shaped reinforcing material 6 is inserted into the hollow double-wall structure 1, and the separation can be performed reliably and easily. In that case, since the hollow double wall structure 1 can be easily cracked by biting the groove tool into the groove portion 12, the separation work is further facilitated.
[0025]
As shown in FIGS. 8 and 9, in the holding member 8 configured to be slidably fitted and supported by the rod-shaped reinforcing member 6, the rod-shaped reinforcing member 6 is positioned on the inner surface of the fitting insertion hole portion 11. An elastic needle 18 is erected. The rod-shaped reinforcing member 6 is temporarily supported by the elastic needle-shaped body 18 when the holding members 8 are inserted into both ends thereof, and positioned in this state, and is inserted into the cavity 15 of the other split mold 14 in this state. Therefore, the rod-shaped reinforcing member 6 and the holding members 8 and 8 are not displaced during blow molding.
[0026]
Since the elastic needle-shaped body 18 is a thin elastic body, when the hollow double-wall structure 1 contracts with respect to the rod-shaped reinforcing member 6 by cooling after blow molding, as shown in FIG. Since 18 bends easily, there is no problem in absorbing the strain accompanying the cooling shrinkage.
[0027]
【The invention's effect】
According to the present invention, a hollow double-wall structure is provided via a holding member having a function of absorbing deformation deformation of the hollow double structure with respect to the rod-shaped reinforcing member at both ends of the rod-shaped reinforcing body disposed in the hollow portion. By holding, the deformation deformation of the rod-shaped reinforcing body can be absorbed by the holding member in the process of cooling and shrinking after the blow molding, and by inserting the metal rod-shaped reinforcing member, Even if the strength and rigidity are improved, a hollow double-walled structure that does not cause deformation distortion due to cooling shrinkage after molding, and a method for producing the same can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a hollow double wall structure according to an embodiment of the present invention as viewed from the back side.
FIG. 2 is an enlarged cross-sectional view of a part of FIG.
FIG. 3 is a side view of a holding member.
4 is a front view of the holding member shown in FIG. 3. FIG.
FIG. 5 is an enlarged cross-sectional view of a portion corresponding to FIG. 2 according to another embodiment of the present invention.
6 is a perspective view of a part of FIG.
FIG. 7 is a cross-sectional view showing a blow molding aspect of a hollow double wall structure according to an embodiment of the present invention and showing an aspect before mold closing.
8 is an enlarged cross-sectional view within a broken-line circle in FIG.
9 is an enlarged cross-sectional view in a broken-line circle of FIG. 7 showing a state after cooling.
10 is a cross-sectional view taken along line AA in FIG.
11 is a sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow double wall structure 2 Front wall 3 Back wall 4 Perimeter wall 5 Hollow part 6 Bar-shaped reinforcement member 7 Enclosure walls 8, 8 Holding member 9 Insertion protrusion part 10 Fit groove 11 Insertion hole part 12,12 Embedding Ridge 13 one split mold 14 the other split mold 15 cavity 16 extrusion die 17 parison 18 elastic needle

Claims (7)

表壁と、表壁に間隔をおいて対向する裏壁と、表壁および裏壁との間に中空部を形成する周囲壁とで構成される中空二重壁構造体であって、中空部内には棒状補強部材が配設されるとともに、裏壁の棒状補強部材の端部に対応する部位には棒状補強部材を中空二重壁構造体に保持する保持部材を有しており、この保持部材は棒状補強部材に対する中空二重構造体の変形歪を吸収する機能を備えていることを特徴とする中空二重壁構造体。A hollow double-wall structure comprising a front wall, a back wall facing the front wall with a space therebetween, and a peripheral wall forming a hollow portion between the front wall and the back wall, Is provided with a holding member for holding the rod-like reinforcing member in the hollow double wall structure at a portion corresponding to the end of the rod-like reinforcing member on the back wall. The member has a function of absorbing the deformation distortion of the hollow double structure with respect to the rod-shaped reinforcing member. 棒状補強部材の周囲は、少なくとも裏壁と一体に連なる包囲壁で包囲されていることを特徴とする請求項１記載の中空二重壁構造体。The hollow double-wall structure according to claim 1, wherein the periphery of the rod-shaped reinforcing member is surrounded by at least an enclosing wall that is integrally connected to the back wall. 棒状補強部材の周囲を包囲する包囲壁は、裏壁の表面側に棒状補強部材の一部を露出する溝部を有していることを特徴とする請求項２記載の中空二重壁構造体。The hollow double wall structure according to claim 2, wherein the surrounding wall surrounding the periphery of the rod-shaped reinforcing member has a groove portion exposing a part of the rod-shaped reinforcing member on the surface side of the back wall. 棒状補強部材を中空二重壁構造体に保持する保持部材は、棒状補強部材をスライド自在に嵌挿支持する構成、あるいは変形歪を吸収する材料で構成されていることを特徴とする請求項１、２または３記載の中空二重壁構造体。2. The holding member for holding the rod-shaped reinforcing member on the hollow double-wall structure is configured to be slidably fitted into the rod-shaped reinforcing member or to be formed of a material that absorbs deformation strain. The hollow double-walled structure according to 2 or 3. 表壁と、表壁に間隔をおいて対向する裏壁と、表壁および裏壁との間に中空部を形成する周囲壁とで構成される中空二重壁構造体をブロー成形する方法であって、一対の分割金型のうち裏壁を形成する金型のキャビティに、両端に保持部材を装着した棒状補強部材をインサートしてブロー成形することを特徴とする中空二重壁構造体の製造方法。In a method of blow molding a hollow double wall structure composed of a front wall, a back wall facing the front wall with a space therebetween, and a peripheral wall forming a hollow portion between the front wall and the back wall A hollow double-wall structure characterized in that a rod-shaped reinforcing member having holding members attached to both ends is inserted into a mold cavity forming a back wall of a pair of split molds and blow-molded. Production method. 裏壁を形成する金型のキャビティに、保持部材の嵌合保持機構を備えており、棒状補強部材の両端に装着した保持部材を上記金型のキャブティに嵌合保持することを特徴とする請求項５記載の中空二重壁構造体の製造方法。A mold cavity forming a back wall is provided with a fitting holding mechanism for holding members, and the holding members attached to both ends of the rod-like reinforcing member are fitted and held in the cab of the mold. Item 6. A method for producing a hollow double-walled structure according to Item 5. 保持部材は棒状補強部材をスライド自在に支持する構成であり、保持部材は棒状補強体の位置決め構造を有していることを特徴とする請求項６記載の中空二重壁構造体の製造方法。7. The method of manufacturing a hollow double-walled structure according to claim 6, wherein the holding member is configured to slidably support the bar-shaped reinforcing member, and the holding member has a positioning structure of the bar-shaped reinforcing body.
JP36950397A 1997-12-26 1997-12-26 Hollow double wall structure and manufacturing method thereof Expired - Fee Related JP3680196B2 (en)

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