JP2002028969A - Fastening structure of blow-molded body and method for preparing the same - Google Patents
Fastening structure of blow-molded body and method for preparing the sameInfo
- Publication number
- JP2002028969A JP2002028969A JP2000214723A JP2000214723A JP2002028969A JP 2002028969 A JP2002028969 A JP 2002028969A JP 2000214723 A JP2000214723 A JP 2000214723A JP 2000214723 A JP2000214723 A JP 2000214723A JP 2002028969 A JP2002028969 A JP 2002028969A
- Authority
- JP
- Japan
- Prior art keywords
- fastening structure
- blow
- hole
- pin
- parison
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶着リブによって補強
された筒状の貫通穴を有するブロー成形体における締結
構造及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure for a blow molded article having a cylindrical through hole reinforced by welding ribs and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】ブロー成形体は、軽量で取り扱い易いた
めに自動車や農業機械などの様々な分野における部品と
して利用価値が高い。そのような部品として利用するた
めには強固で安全な締結構造を有することが不可欠であ
る。ブロー成形法ではパリソンと称する溶融樹脂の管状
体を作り、この内部に圧縮空気を吹き込んで材料を膨張
させ、所望の形状の金型に密着固化させて中空体を作成
する。従来、中空体に締結部を形成するには、例えば、
ブロー成形時にパリソンを金型内で締結部分を溶着して
ボルト用の穴をあけ、周囲の溶着部でボルト又はナット
の締め付け座を形成する方法、または中空部の相対する
壁間にパイプ状のボルト締結穴を設ける方法がとられて
いる（図２４（ａ）〜（ｃ））。2. Description of the Related Art Blow molded articles are highly useful as parts in various fields such as automobiles and agricultural machines because they are lightweight and easy to handle. In order to use such components, it is essential to have a strong and safe fastening structure. In the blow molding method, a tubular body of a molten resin called a parison is made, the material is expanded by blowing compressed air into the inside, and solidified in a mold having a desired shape to form a hollow body. Conventionally, to form a fastening portion in a hollow body, for example,
At the time of blow molding, the parison is welded at the fastening part in the mold to make holes for bolts, and a bolt or nut tightening seat is formed at the surrounding welded part, or a pipe-shaped between the opposing walls of the hollow part A method of providing a bolt fastening hole is employed (FIGS. 24A to 24C).
【０００３】[0003]
【発明が解決しようとする課題】しかし、金型内で溶着
した場合、周囲の溶着部で締め付け座を形成している部
分が１枚の板状であり肉厚がパリソンの２枚合わせ分以
上に厚くならないため、大きい引抜き力がかかる場合
や、ボルトが傾く力には耐えられないという問題があ
る。However, when welding is performed in a mold, a portion where a fastening seat is formed at a peripheral welded portion is a single plate and the thickness is equal to or greater than the thickness of two parisons. Therefore, there is a problem in that a large pulling force is applied and the bolt cannot withstand a tilting force.
【０００４】また、壁同士の間に筒状の貫通穴を設けた
場合、締付力が大きいと貫通穴の部分が潰れ易い。そこ
でボルトの締付力を弱くすると、完成品のブロー成形体
中空部分の潰れやへたりが発生し、締結力が低下すると
いう問題があった。Further, when a cylindrical through hole is provided between the walls, if the tightening force is large, the portion of the through hole is easily crushed. Therefore, if the tightening force of the bolt is weakened, there is a problem that the hollow portion of the blow molded body of the finished product is crushed or set, and the fastening force is reduced.
【０００５】また、ボルトを引抜くときや、何らかの事
情でボルトが傾くと、貫通穴の筒状の壁のみでは対抗力
が弱く使用中に破損する可能性が大きいので、穴部分を
肉厚にして強化する方法もとられる。しかし、この方法
では成形品全体の重量が大きくなって取扱いが困難にな
るばかりか原材料の使用量が増加し、しかも製造に時間
が多くかかるという問題がある。Further, when the bolt is pulled out or the bolt is tilted for some reason, the cylindrical wall of the through-hole alone has a low opposing force and is likely to be damaged during use. There is a way to strengthen it. However, this method has a problem that not only the weight of the entire molded article becomes large and handling becomes difficult, but also the amount of raw materials used increases, and the production takes a long time.
【０００６】上記のように、従来のブロー成形法で得ら
れる締結構造では締結部分が弱く亀裂が発生したり破損
する恐れがあるために引っ張り強度の大きいボルトや太
いボルトを使用することができず、多数のボルトを使用
することで対処する必要があった。また、締結部分の補
強を目的として肉厚にすると重量が大きくなり部品とし
ての用途が制限されることにもなる。従って、ブロー成
形体を、その軽量で取り扱いやすいという長所を活かし
て重要な機械の部品としても安心して効果的に使用する
ためには、充分な強度を有する締結構造を設ける必要が
ある。As described above, in the fastening structure obtained by the conventional blow molding method, since the fastening portion is weak and there is a possibility of cracking or breakage, a bolt having a large tensile strength or a thick bolt cannot be used. Had to be addressed by using a large number of bolts. Further, if the thickness is increased for the purpose of reinforcing the fastening portion, the weight is increased, and the use as a part is restricted. Therefore, in order to use the blow molded body as an important machine component with the advantage of being lightweight and easy to handle, it is necessary to provide a fastening structure having sufficient strength.
【０００７】このような状況に鑑みて、本発明の第１の
目的は、樹脂原料の使用量を増量することなく、ブロー
成形の長所を活かして、充分な強度の締結構造を有する
ブロー成形体を得ることである。さらに詳しくは、本発
明は様々な力に対して充分に補強された筒状の貫通穴を
有するブロー成形体における締結構造を得ることを目的
とする。本発明の他の目的は、上記の締結構造の、簡便
で応用範囲が広い製造方法を提供することである。In view of such circumstances, a first object of the present invention is to provide a blow-molded article having a fastening structure with sufficient strength by utilizing the advantages of blow molding without increasing the amount of resin material used. It is to get. More specifically, an object of the present invention is to obtain a fastening structure in a blow molded article having a cylindrical through hole sufficiently reinforced against various forces. Another object of the present invention is to provide a simple and wide-ranging method for manufacturing the above-mentioned fastening structure.
【０００８】[0008]
【課題を解決するための手段】本発明は上記の課題を解
決するために、中空体の相対する壁を貫く筒状の貫通穴
の外壁面に溶着し、少なくとも一方の壁面に基部を有し
対向する壁面に向けて延びる補強リブを設けていること
を特徴とするブロー成形体の締結構造を提供している。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem by welding a cylindrical through hole to an outer wall surface penetrating an opposing wall of a hollow body and having a base on at least one wall surface. There is provided a fastening structure for a blow molded body, wherein a reinforcing rib extending toward an opposing wall surface is provided.
【０００９】本発明はまた、上記のブロー成形体の締結
構造の製造方法であって、対向して配置された二つのブ
ロー成形用金型の間に、ヘッドから加熱軟化した合成樹
脂製の筒状パリソンを降下させ、次いで、両金型を閉じ
る方向に動かすとともに、ブローノズルから高圧空気を
吹き込むことにより両金型の内部形状をかたどった外形
状を有する成形体を製造するブロー成形法において、少
なくとも一方の金型に貫通穴用のピンを設けると共に、
上記筒状パリソンに縦方向の弛みをもたせ、加圧空気を
吹き込むと同時に折皺を形成せしめることを特徴とする
ブロー成形体における締結構造の製造方法を提供する。The present invention also relates to a method of manufacturing the above-mentioned fastening structure for a blow-molded article, comprising a synthetic resin tube heated and softened from a head between two blow-molding dies arranged opposite to each other. In a blow molding method for manufacturing a molded body having an outer shape that resembles the inner shape of both dies by lowering the parison and then moving both dies in the closing direction and blowing high-pressure air from a blow nozzle, Along with providing a pin for a through hole in at least one mold,
A method for manufacturing a fastening structure in a blow-molded article, characterized in that the cylindrical parison has a slack in a vertical direction and blows pressurized air and simultaneously forms wrinkles.
【００１０】本明細書中、筒状の貫通穴において、該貫
通穴の筒状周壁の内側を内壁、外側を外壁と称する。従
って、締結時には、ボルト等の締結具は貫通穴の内壁面
に沿って中空体を貫通することになる。In the present specification, in a cylindrical through hole, the inside of the cylindrical peripheral wall of the through hole is called an inner wall, and the outside is called an outer wall. Therefore, at the time of fastening, fasteners such as bolts penetrate the hollow body along the inner wall surface of the through hole.
【００１１】本発明の締結構造は、中空体の相対する壁
を貫く筒状の貫通穴の外壁面に、一方の壁から他の壁に
向けて延びる補強リブを溶着させているので、この貫通
穴にボルト等の締結具を通して締結した場合、中空体の
壁面は締付力に対して充分な強度を有している。また、
ボルト等を傾かせる力や引抜こうとする力に対する対応
力は約１．５倍〜３倍に増大していることが示された
（試験例参照）。このように、本発明の締結構造を有す
るブロー成形体では締結に伴う亀裂の発生や破損が回避
され、引っ張り強度の大きいボルトや太いボルトを使用
することが可能になる。また、それによりボルトの締結
本数を減少しブロー成形体の適用範囲を拡大することが
できる。従って、貫通穴の補強のために多量の樹脂を用
いることなく、充分な強度の締結構造を有するブロー成
形体が得られるので、重要な機械部品のブロー成形法に
よる製造が可能になる。In the fastening structure of the present invention, since the reinforcing rib extending from one wall to the other wall is welded to the outer wall surface of the cylindrical through hole penetrating the opposing wall of the hollow body, When the hole is fastened through a fastener such as a bolt, the wall surface of the hollow body has a sufficient strength against the tightening force. Also,
It was shown that the corresponding force to the force for tilting the bolts and the like and the force for pulling out increased about 1.5 to 3 times (see Test Examples). As described above, in the blow-molded article having the fastening structure of the present invention, generation and breakage of cracks due to fastening are avoided, and bolts having large tensile strength and thick bolts can be used. In addition, it is possible to reduce the number of bolts to be fastened, thereby expanding the applicable range of the blow molded body. Therefore, a blow-molded article having a fastening structure with sufficient strength can be obtained without using a large amount of resin for reinforcing the through-hole, and thus it is possible to manufacture important mechanical parts by the blow-molding method.
【００１２】本発明の締結構造の補強リブは、中空体の
内壁に基部を有し、他の壁に向けて貫通穴の外壁面に溶
着している。好ましくは、リブの先端はもう一方の壁に
到達していると、より大きな効果がある。The reinforcing rib of the fastening structure according to the present invention has a base portion on the inner wall of the hollow body and is welded to the outer wall surface of the through hole toward another wall. Preferably, the effect is greater if the rib tips reach the other wall.
【００１３】また、補強リブの数及び位置としては、補
強効果が得られる限り、任意であり、外圧のかかる方向
を考慮して目的に応じて適宜配することができる。筒状
の貫通穴の外壁面に１〜数個、通常は１〜４個程度設け
るとよい。使用目的に応じてリブの数及び位置を適宜選
択することができる。The number and positions of the reinforcing ribs are arbitrary as long as the reinforcing effect is obtained, and can be appropriately arranged according to the purpose in consideration of the direction in which external pressure is applied. It is preferable to provide one to several, usually about one to four, on the outer wall surface of the cylindrical through hole. The number and positions of the ribs can be appropriately selected according to the purpose of use.
【００１４】本発明の１つの態様では、補強リブはその
基部を中空体の一方の壁のみに有する。また、他の実施
態様では補強リブは両方の壁に基部を有し、中間部で接
近するか、一体となる。In one embodiment of the invention, the reinforcing rib has its base on only one wall of the hollow body. Also, in other embodiments, the reinforcing ribs have bases on both walls, approaching or integral in the middle.
【００１５】本発明の締結構造を有するブロー成形体と
しては、ブロー成型法で製造可能なあらゆるプラスチッ
ク製品及びその部品が含まれ、例えば自動車のエアース
ポイラー、バンパービーム、シート用フレーム、フロア
パネル、浮桟橋、デスクボード、中空部のある工具箱、
大型の組立中空パネル、チャイルドシート用の締結部分
に強度の必要な部品などすべてに使用できるが、これら
に限定されない。The blow-molded article having the fastening structure according to the present invention includes all plastic products and parts thereof which can be manufactured by a blow-molding method, such as an air spoiler for automobiles, a bumper beam, a seat frame, a floor panel, and a float. Pier, desk board, tool box with hollow part,
The present invention can be used for, but not limited to, large assembled hollow panels, parts requiring strength in a fastening portion for a child seat, and the like.
【００１６】ブロー成形体の原料は熱可塑性樹脂であ
り、例えば、ポリエチレン、ポリプロピレン、ポリカー
ボネート、ポリスチレン、ＡＢＳ、およびそれらの複合
体材料が用いられる。The raw material of the blow molded article is a thermoplastic resin, for example, polyethylene, polypropylene, polycarbonate, polystyrene, ABS, and a composite material thereof.
【００１７】本発明の締結構造は従来のブロー成形法の
改良法で容易に製造することができる。即ち、従来のブ
ロー成形法では、図２５（ａ）に示すように、所定の内
部形状を有し対向して配置された二つのブロー成形用金
型Ｔ１、Ｔ２の間に、ヘッドＨから加熱軟化した合成樹
脂製の筒状パリソンＰを所定量降下させ、次いで、両金
型１及び２を閉じる方向に動かすとともに、ブローノズ
ルＢを上昇させ、図２５（ｂ）に示すように、両金型Ｔ
１及びＴ２よりブローノズルＢ及びパリソンＰの両端部
を挟持し、この状態で、ブローノズルＢから高圧空気を
吹き込むことにより、両金型Ｔ１及びＴ２の内部形状
（キャビティ）をかたどった外形状を有する成形体を製
造するというものである。The fastening structure of the present invention can be easily manufactured by an improved method of the conventional blow molding method. That is, in the conventional blow molding method, as shown in FIG. 25A, a head H heats between two blow molding dies T1 and T2 having a predetermined internal shape and arranged opposite to each other. The cylindrical parison P made of the softened synthetic resin is lowered by a predetermined amount, and then both the molds 1 and 2 are moved in the closing direction, and the blow nozzle B is raised, as shown in FIG. Type T
Both ends of the blow nozzle B and the parison P are sandwiched between 1 and T2, and in this state, high-pressure air is blown from the blow nozzle B to form an outer shape that models the inner shape (cavity) of both dies T1 and T2. Is to produce a molded article having the same.
【００１８】本発明の締結構造をブロー成形体に付与す
るには、上記の従来法において、貫通穴用のピンを有す
る一対の金型の間に、縦方向の弛みを有する筒状パリソ
ンＰを垂下させて折皺を成形させることで貫通穴外周壁
に溶着した補強リブを形成する。このリブを「折皺リ
ブ」と称する。この弛みを生じさせるには、当業者既知
の方法が利用できる。例えば、金型の間にパリソンが降
下すると同時にブローノズルから空気を入れてパリソン
に張りを持たせるプリブローの工程を、通常のパリソン
の空気量の約３０から約８０％、好ましくは約５０〜６
０％の空気量で行う。In order to apply the fastening structure of the present invention to a blow-molded article, a cylindrical parison P having a slack in a vertical direction is provided between a pair of dies having pins for through holes in the above-mentioned conventional method. A reinforcing rib welded to the outer peripheral wall of the through hole is formed by hanging down and forming a crease. This rib is referred to as a "folded rib." In order to cause this slack, a method known to those skilled in the art can be used. For example, the pre-blowing step of injecting air from the blow nozzle to make the parison tight while the parison descends between the molds is performed by a process of about 30 to about 80% of the normal parison air volume, preferably about 50 to 6%.
Perform with 0% air volume.
【００１９】あるいは、プリブローを完全に行わず、適
量の空気量が入った時点で止めることにより、弛みを与
えることができる。または、貫通穴用のピンの近傍に板
状のピンを突出させ、金型を閉じてパリソンの端を挟持
したとき、板状ピンでパリソンに弛みを生じさせ、金型
が閉まる直前に後退させる方法がある。あるいは、板状
ピンを後退させず、そのまま対向する壁面に接するか、
近接させて成形すると、パリソンが板状ピンで一方に押
圧され、皺が生じることによる折皺のリブと、いわゆる
板状の溶着リブができるので、より強力に補強すること
ができる。このようにして形成されるリブを「板状リ
ブ」と称する。板状ピンは貫通穴を形成するためのピン
の近傍に任意の数設けることができるが、縦方向のたる
みを生じるためには通常、ピンの上及び／又は下側に、
縦方向に設けるとよい。長さは目的に応じて適宜選択す
ることができる。Alternatively, slack can be given by stopping pre-blowing completely when an appropriate amount of air has entered. Alternatively, when a plate-shaped pin is protruded near the pin for a through-hole, and the mold is closed and the end of the parison is clamped, the parison is loosened by the plate-shaped pin and is retracted immediately before the mold is closed. There is a way. Alternatively, the plate-like pin does not recede, and directly contacts the opposing wall surface,
When the parisons are formed close to each other, the parison is pressed to one side by a plate-like pin, and a wrinkled rib caused by wrinkles and a so-called plate-shaped welding rib are formed, so that the reinforcement can be strengthened more strongly. The rib thus formed is referred to as a “plate-like rib”. Although any number of plate-like pins can be provided near the pins for forming the through-holes, in order to cause the vertical sag, usually, the pins above and / or below the pins are provided.
It may be provided in the vertical direction. The length can be appropriately selected according to the purpose.
【００２０】また、相対する金型の互いに対照的な位置
に貫通穴用のピン、あるいは該ピンと板状ピンとを設け
ることにより、中空体の相対する壁に基部を有し、先端
が中間部で合体するか極めて近接している、折皺リブ又
は板状リブで補強された貫通穴を得ることができる。Further, by providing a pin for a through-hole or a pin and a plate-shaped pin at positions opposite to each other on a mold opposite to each other, the hollow body has a base at opposite walls, and a tip is an intermediate part. Through holes reinforced with folded wrinkles or plate-like ribs can be obtained which are merged or very close together.
【００２１】さらに、貫通穴用のピンに板状ピンを一体
に設けても、折皺リブと同様のリブが形成される。ある
いは従来の補強リブの形成法に従い、金型の側面から、
ピンと、場合によっては板状ピンとを挿入することで、
貫通穴に複数の板状リブを設けることができる。Further, even if a plate-like pin is provided integrally with a pin for a through hole, a rib similar to a crease rib is formed. Or according to the conventional method of forming the reinforcing rib, from the side of the mold,
By inserting pins and, in some cases, plate pins,
A plurality of plate-like ribs can be provided in the through hole.
【００２２】従来、内部構造そのものを補強するために
リブを設けたブロー成形体の構造は知られている（特開
平６−７１７３８、米国特許第４９５１９８６号）。し
かし、これらの方法では、スライド板などを用いる方法
であり複雑な金型と熟練した技術が必要であった。本発
明方法は、これら従来法とは異なり、極めて簡便な方法
で、充分な効果のある補強リブを有する締結構造を得る
ことができる。本発明以前には、このような溶着リブで
補強された貫通穴を有する締結構造は存在しなかった。Conventionally, the structure of a blow-molded article provided with ribs for reinforcing the internal structure itself has been known (JP-A-6-71738, US Pat. No. 4951986). However, these methods use a slide plate or the like, and require a complicated mold and a skilled technique. According to the method of the present invention, unlike the conventional methods, it is possible to obtain a fastening structure having a sufficiently effective reinforcing rib by an extremely simple method. Prior to the present invention, there was no fastening structure having a through hole reinforced with such welding ribs.
【００２３】[0023]
【発明の実施の形態】以下、本発明の実施形態を図面を
参照して説明する。 実施例１ 折皺リブで補強された貫通穴を有するブロー
成形体 図１は、実施例１の締結構造の使用状態を示す縦断面
図、図２は図１から９０度回転した位置の矢視方向から
見た締結構造の縦断面図である。実施例１の締結構造で
は、ブロー成形で得られた中空体１の相対する壁２１、
２２に筒状の貫通穴２３を設け、その貫通穴２３の周壁
の外壁面に一対の補強リブ３１、３２を、一方の壁２１
から他の壁２２に向けて溶着させている。図１に示すよ
うに、中空体１は貫通穴２３にボルト４及びナット５に
よって締結対象Ｓに固定的に締結されている。この例で
は貫通穴２３は、ボルト穴として使用するように、ボル
ト４の形状に合わせて形成されているが、他の締結具を
使用する場合は、それぞれの形状に合わせて成形するこ
とができる。また、またナット５を挿入しても良い。Embodiments of the present invention will be described below with reference to the drawings. Example 1 Blow Molded Body Having Through Hole Reinforced by Folded Rib FIG. 1 is a longitudinal sectional view showing a use state of the fastening structure of Example 1, and FIG. 2 is a direction rotated by 90 degrees from FIG. FIG. 3 is a longitudinal sectional view of the fastening structure as viewed from the side. In the fastening structure of the first embodiment, the opposing walls 21 of the hollow body 1 obtained by blow molding,
22 is provided with a cylindrical through hole 23, and a pair of reinforcing ribs 31, 32 is provided on the outer wall surface of the peripheral wall of the through hole 23,
And the other wall 22 is welded. As shown in FIG. 1, the hollow body 1 is fixedly fastened to a fastening target S by a bolt 4 and a nut 5 in a through hole 23. In this example, the through hole 23 is formed according to the shape of the bolt 4 so as to be used as a bolt hole. However, when another fastener is used, the through hole 23 can be formed according to each shape. . Further, the nut 5 may be inserted.
【００２４】（１）図３〜６は、上記の締結構造を有す
るブロー成形体の製造工程を示す説明図である。図３は
金型６１の斜視図であり、図４は金型が開いている状態
のブロー成形の側面図、図５はその平面図である。６
１、６２は成形用キャビティを構成する一対の金型であ
り、その一方の金型６１の内壁に貫通穴形成用のピン７
１が設けられている。Ｈはヘッド、Ｐは合成樹脂製のパ
リソン、８は吹込みノズルである。(1) FIGS. 3 to 6 are explanatory views showing the steps of manufacturing a blow molded article having the above-described fastening structure. 3 is a perspective view of the mold 61, FIG. 4 is a side view of blow molding with the mold open, and FIG. 5 is a plan view thereof. 6
Reference numerals 1 and 62 denote a pair of molds constituting a molding cavity, and a pin 7 for forming a through hole is formed on the inner wall of one mold 61.
1 is provided. H is a head, P is a parison made of synthetic resin, and 8 is a blowing nozzle.
【００２５】一連の工程を説明すると、（ａ)ヘッドＨ
から加熱軟化した合成樹脂製の筒状パリソンＰを降下さ
せ、（ｂ）両金型６１及び６２を閉じる方向に動かすと
ともに、ブローノズル８を上昇させ、プリブローする。
このときの空気量は６０％である。ついで両金型６１及
び６２より吹込みノズル８及びパリソンＰの両端部を挟
持すると、プリブロー量が通常値（１００％）の約６０
％なので、パリソンＰに縦方向の弛みが生じる。A series of steps will be described. (A) Head H
Then, the cylindrical parison P made of synthetic resin which has been softened by heating is lowered, and (b) both dies 61 and 62 are moved in the closing direction, and the blow nozzle 8 is raised and pre-blown.
The amount of air at this time is 60%. Next, when the both ends of the blowing nozzle 8 and the parison P are sandwiched by the two dies 61 and 62, the pre-blow amount is about 60% of the normal value (100%).
%, The parison P is slackened in the vertical direction.
【００２６】（ｃ）この状態で、吹込みノズル８から高
圧空気を吹き込むことにより、両金型６１及び６２の内
部形状（キャビティ）をかたどった形状と、ピン７１に
相当する位置に相対する壁面２１、２２を貫通する貫通
穴２３を有する中空体１が製造される。このとき、金型
６１、６２が閉じることで縦方向に弛みを有するパリソ
ンＰの弛み部分に生じた折皺が、貫通穴２３の外壁面縦
方向に溶着し、金型６１側の壁２１に基部を有する補強
リブ３１、３２が相対する壁２２に向けて形成されるこ
とになる（図６）。次いで、金型６１、６２を開いて常
法通り、成形体１を取り出して仕上げる。(C) In this state, high-pressure air is blown from the blowing nozzle 8 to form the shapes of the internal shapes (cavities) of the two dies 61 and 62 and the wall surface facing the position corresponding to the pin 71. The hollow body 1 having the through-hole 23 penetrating through 21 and 22 is manufactured. At this time, the wrinkles generated in the slack portion of the parison P having the slack in the vertical direction due to the closing of the molds 61 and 62 are welded in the longitudinal direction of the outer wall surface of the through hole 23, and the base portion is formed on the wall 21 on the mold 61 side. Is formed toward the opposing wall 22 (FIG. 6). Next, the molds 61 and 62 are opened, and the molded body 1 is taken out and finished as usual.
【００２７】実施例２ 相対する折皺リブで補強された
貫通穴を有するブロー成形体 図７〜９に記載の締結構造では、中空体１の相対する壁
２１及び２２の両方から、それぞれに基部を有する補強
リブ３１、３２及び３３，３４が貫通穴２３の両側外壁
面に形成されている。図９はボルト４を貫通穴２３に挿
入して締結対象Ｓに締結した状態を示す図である。この
折皺リブ３１〜３４で補強された貫通穴を有する締結構
造は上記実施例１に記載の方法において、金型６１、６
２の相対する位置に貫通穴用のピン７１を設けることに
よって製造することができる。Example 2 Blow Molded Body Having Through Holes Reinforced by Opposite Wrinkled Ribs In the fastening structure described in FIGS. 7 to 9, the base is formed from both opposing walls 21 and 22 of hollow body 1. Reinforcing ribs 31, 32 and 33, 34 are formed on both outer wall surfaces of the through hole 23. FIG. 9 is a view showing a state in which the bolt 4 is inserted into the through hole 23 and fastened to the fastening object S. The fastening structure having the through holes reinforced by the crease ribs 31 to 34 is the same as the method described in the first embodiment, except that the dies 61, 6
It can be manufactured by providing a pin 71 for a through hole at a position opposite to the position 2.
【００２８】実施例３ 板状リブで補強された貫通穴を
有するブロー成形体 （１）図１０は折皺リブ３５と板状リブ３６を各１個有
する貫通穴２３の構造を示す側面図である。即ち、貫通
穴２３の一方には、中空体１の相対する壁２１から２２
に向けて折皺リブ３１が、反対側には同じく相対する壁
２１から２２に至る板状リブ３５が溶着形成されてい
る。図１１はボルト４を貫通穴２３に挿入して締結した
状態を示す図である。Example 3 Blow Molded Body Having Through Hole Reinforced by Plate Rib (1) FIG. 10 is a side view showing the structure of a through hole 23 having one crease rib 35 and one plate rib 36. . That is, in one of the through holes 23, the opposite walls 21 to 22 of the hollow body 1 are provided.
And a plate-like rib 35 extending from the opposite wall 21 to 22 is welded to the opposite side. FIG. 11 is a view showing a state in which the bolt 4 is inserted into the through hole 23 and fastened.
【００２９】図１２〜１５は、本実施例の締結構造を有
するブロー成形体の製造工程を示す説明図である。図１
２は金型の斜視図である。金型６１にはボルト穴を形成
するためのピン７２が上下に設けられておりその中間に
板状ピン７２が同一方向に向けて突出させて設けられて
いる。FIGS. 12 to 15 are explanatory views showing the steps of manufacturing a blow molded article having the fastening structure of the present embodiment. Figure 1
2 is a perspective view of a mold. The mold 61 is provided with pins 72 for forming bolt holes at upper and lower sides, and a plate-like pin 72 is provided in the middle thereof so as to protrude in the same direction.
【００３０】図１３は金型が開いている状態のブロー成
形の側面図、図１４はその平面図、図１５は金型が閉じ
た状態である。６１、６２は成形用キャビティを構成す
る一対の金型であり、その一方の金型６１の内壁に貫通
穴形成用のピン７１と板状ピン７２が設けられている。
図ではピン７１を上下に２つ設けているが、その数及び
位置は目的に応じて適宜調整される。また、Ｈはヘッ
ド、Ｐは合成樹脂製のパリソン、８は吹込みノズルであ
る。ピン７１の長さ、板状ピン７２の長さは任意である
が、図１のごとくボルト４の頭部が貫通穴２３内に埋ま
った状態で締結するためには、図１３〜１５に示すよう
に板状ピン７２を貫通穴用ピン７１よりもやや長くする
とよい。FIG. 13 is a side view of blow molding with the mold open, FIG. 14 is a plan view thereof, and FIG. 15 is a state in which the mold is closed. Reference numerals 61 and 62 denote a pair of molds constituting a molding cavity. A pin 71 for forming a through hole and a plate-like pin 72 are provided on the inner wall of one mold 61.
In the figure, two pins 71 are provided on the upper and lower sides, but the number and position thereof are appropriately adjusted according to the purpose. H is a head, P is a parison made of synthetic resin, and 8 is a blowing nozzle. The length of the pin 71 and the length of the plate-like pin 72 are arbitrary. However, in order to fasten the bolt 4 in a state where the head of the bolt 4 is buried in the through hole 23 as shown in FIG. The plate-like pin 72 may be slightly longer than the through-hole pin 71 as described above.
【００３１】一連の工程を説明すると、（ａ）ヘッドＨ
から加熱軟化した合成樹脂製の筒状パリソンＰを降下さ
せ、（ｂ）両金型６１及び６２を閉じる方向に動かすと
ともに、ブローノズル８を上昇させ、両金型６１及び６
２より吹込みノズル８及びパリソンＰの両端部を挟持す
ると、板状ピン７２によってパリソンＰに縦方向の弛み
が生じる（図１３）。（ｃ）この状態で、吹込みノズル
８から高圧空気を吹き込むことにより、両金型６１及び
６２の内部形状（キャビティ）をかたどった形状と、ピ
ン７１に相当する位置に相対する壁面２１、２２を貫通
する貫通穴２３を有する中空体１が製造される。この貫
通穴２３には、板状ピン７２によって縦方向の弛みが付
与されているパリソンＰは、金型６１、６２が閉じるこ
とで弛み部分に折れ皺が生じ、最終的に貫通穴２３の外
壁面縦方向に溶着して、金型６１側の壁２１に基部を有
する折皺リブ３１と板状リブ３５が相対する壁２２に向
けて形成されることになる（図１５）。次いで、金型６
１、６２を開いて常法通り、成形体１を取り出して仕上
げる。A series of steps will be described. (A) Head H
Then, the cylindrical parison P made of heat-softened synthetic resin is lowered, and (b) the two dies 61 and 62 are moved in the closing direction, and the blow nozzle 8 is raised, and the two dies 61 and 6 are raised.
When the both ends of the blowing nozzle 8 and the parison P are sandwiched from 2, the plate-like pin 72 causes the parison P to loosen in the vertical direction (FIG. 13). (C) In this state, high-pressure air is blown from the blowing nozzle 8 to form the inner shapes (cavities) of the two dies 61 and 62 and the wall surfaces 21 and 22 facing the position corresponding to the pin 71. The hollow body 1 having the through-hole 23 penetrating through is manufactured. The parison P, in which the through holes 23 are provided with a slack in the vertical direction by the plate-like pins 72, is bent when the molds 61 and 62 are closed, and finally the wrinkles are formed in the slack portions. Folded ribs 31 having bases on the wall 21 on the side of the mold 61 and plate-shaped ribs 35 are welded in the vertical direction of the wall surface and formed toward the opposing wall 22 (FIG. 15). Next, mold 6
After opening 1, 62, the molded body 1 is taken out and finished as usual.
【００３２】実施例４ 一対の板状リブで補強された貫
通穴を有するブロー成形体 図１６は貫通穴２３の対称な位置に中空体１の相対する
壁２１から２２に至る板状リブ３５及び３６を有する締
結構造の側面図である。この締結構造を有する成形体
は、図１７に示すように、貫通穴用のピン７１、その両
側に板状ピン７２及び７３を設けた金型６１を用い、上
記実施例３と同様にして製造することができる。Example 4 Blow Molded Body Having Through Hole Reinforced by a Pair of Plate Ribs FIG. 16 shows plate ribs 35 extending from opposite walls 21 to 22 of hollow body 1 at symmetrical positions of through holes 23. It is a side view of the fastening structure which has 36. As shown in FIG. 17, a molded body having this fastening structure was manufactured in the same manner as in Example 3 above, using a mold 61 provided with through-hole pins 71 and plate-like pins 72 and 73 on both sides thereof. can do.
【００３３】実施例５ ３個のリブで補強された貫通穴
を有するブロー成形体 図１８は貫通穴２３の３個所に中空体１の相対する壁２
１から２２に向かう補強リブ３５、３６、３７を有する
締結構造の平面図である。図１９はこの締結構造を製造
するための金型６１の要部を示す図であって、貫通穴用
のピン７１と板状ピン７２を有し、このピン７１に、前
記板状ピン７２と反対側に翼状片７１ａ及び７１ｂを設
けている。この実施態様では、翼状片の数及び位置を適
宜変化させることにより、リブの数や形状を調節するこ
とができる。Example 5 Blow-molded body having a through-hole reinforced with three ribs FIG.
It is a top view of the fastening structure which has the reinforcement rib 35,36,37 from 1 to 22. FIG. 19 is a view showing a main part of a mold 61 for manufacturing this fastening structure, which has a pin 71 for a through hole and a plate-like pin 72, and the pin 71 On the opposite side, wings 71a and 71b are provided. In this embodiment, the number and shape of the ribs can be adjusted by appropriately changing the number and position of the wings.
【００３４】実施例６ ４個のリブで補強された貫通穴
を有するブロー成形体 図２０は貫通穴２３の対称な計４個所に中空体１の相対
する壁２１から２２に至る補強リブ３８〜４１を有する
締結構造の平面図である。なお、図２１及び図２２はそ
れぞれ９０度ずらした対置から見た縦断面図である。こ
の相対する壁２１、２２を連結する補強リブを４個所に
有する締結構造の製造は、上記各実施例に記載の方法に
おいて、板状ピン７２を金型６１，６２の適当な位置か
ら突出させることにより製造することができる。Example 6 Blow Molded Body Having Through Holes Reinforced by Four Ribs FIG. 20 shows reinforcing ribs 38 to extending from opposite walls 21 to 22 of hollow body 1 to a total of four symmetrical positions of through holes 23. It is a top view of the fastening structure which has 41. FIGS. 21 and 22 are vertical cross-sectional views as viewed from the opposite direction by 90 degrees. In the manufacture of the fastening structure having four reinforcing ribs connecting the opposed walls 21 and 22 in the method described in each of the above embodiments, the plate-like pin 72 is projected from an appropriate position of the molds 61 and 62. It can be manufactured by the following.
【００３５】試験例 締結構造の強度の測定 本発明の締結構造を有する中空体１の貫通穴にボルトを
挿入して該中空体１を支持体Ｓに固定し、その締結強度
を測定した。図２３（Ａ）、（Ｂ）、（Ｃ）に示すよう
に、中空体１に対し、支持体Ｓから剥離する方向に圧力
をかけ締結部が破損される強度を測定した。（Ａ）及び
（Ｂ）は比較例として従来の締結構造（それぞれ、図２
４の（ａ）及び（ｃ））を示す。また、（Ｃ）は本発明
（実施例３）の締結構造である。Test Example Measurement of Strength of Fastening Structure A bolt was inserted into a through hole of the hollow body 1 having the fastening structure of the present invention, the hollow body 1 was fixed to the support S, and the fastening strength was measured. As shown in FIGS. 23 (A), (B), and (C), pressure was applied to the hollow body 1 in a direction in which the hollow body 1 was separated from the support S, and the strength at which the fastening portion was broken was measured. (A) and (B) show a conventional fastening structure as a comparative example (FIG. 2).
4 (a) and (c)). (C) is a fastening structure of the present invention (Example 3).
【００３６】[0036]
【表１】 上記の結果は、本発明の締結構造が従来の締結構造に比
較して極めて強度が高いことを示している。[Table 1] The above results show that the fastening structure of the present invention has extremely high strength as compared with the conventional fastening structure.
【００３７】[0037]
【発明の効果】本発明の締結構造は、中空体の相対する
壁を貫く筒状の貫通穴の外壁面に、一方の壁から他の壁
に向けて延びる補強リブを溶着させているので、この貫
通穴にボルト等の締結具を通して締結した場合、中空体
の壁面及び締結部は締付力に対して充分な強度を有して
いる。実際、ボルト等を傾かせる力や引抜こうとする力
に対する対応力は約１．５倍〜３倍に増大しているの
で、引っ張り強度の大きいボルトや太いボルトを使用す
ることが可能になる。また、それによりボルトの締結本
数を減少させることができるので、ブロー成形体の適用
範囲が大いに拡大される。According to the fastening structure of the present invention, the reinforcing rib extending from one wall to the other wall is welded to the outer wall surface of the cylindrical through hole penetrating the opposing wall of the hollow body. When the fastener is fastened to the through hole through a fastener such as a bolt, the wall surface and the fastening portion of the hollow body have sufficient strength against the fastening force. In fact, since the force corresponding to the force for tilting the bolt or the like or the force for pulling it out is increased about 1.5 to 3 times, it is possible to use a bolt having a large tensile strength or a thick bolt. In addition, since the number of bolts to be fastened can be reduced, the application range of the blow molded article is greatly expanded.
【００３８】また、貫通穴の補強のために多量の樹脂を
用いる必要がないので、軽量で取り扱いやすいという長
所を活かして充分な強度の締結構造を有するブロー成形
体を得ることができ、ブロー成形体を重要な機械部品と
して使用することが可能となる。これはまた省資源にも
貢献すると考えられる。Further, since it is not necessary to use a large amount of resin for reinforcing the through-holes, it is possible to obtain a blow-molded article having a fastening structure with sufficient strength by taking advantage of its light weight and easy handling. The body can be used as an important mechanical part. This will also contribute to resource savings.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 実施例１の締結構造の使用状態を示す縦断面
図である。FIG. 1 is a longitudinal sectional view illustrating a use state of a fastening structure according to a first embodiment.
【図２】 図１の締結構造において矢視方向から見た縦
断面図である。FIG. 2 is a longitudinal sectional view of the fastening structure of FIG. 1 as viewed from the direction of the arrow.
【図３】 実施例１の締結構造を有するブロー成形体の
製造に用いる金型の斜視図である。FIG. 3 is a perspective view of a mold used for manufacturing a blow molded body having the fastening structure of the first embodiment.
【図４】 実施例１の締結構造の締結構造を有するブロ
ー成形体の製造工程を説明するための側面図である。FIG. 4 is a side view for explaining a manufacturing process of the blow molded body having the fastening structure of the fastening structure of the first embodiment.
【図５】 同じく平面図である。FIG. 5 is a plan view of the same.
【図６】 同じく製造工程を説明するための側面図であ
る。FIG. 6 is a side view for explaining the manufacturing process.
【図７】 実施例２の締結構造の縦断面図である。FIG. 7 is a longitudinal sectional view of a fastening structure according to a second embodiment.
【図８】 図４の締結構造における９０度回転した位置
の縦断面図である。FIG. 8 is a longitudinal sectional view of a position rotated by 90 degrees in the fastening structure of FIG. 4;
【図９】 図４の締結構造における使用状態を示す図で
ある。FIG. 9 is a diagram showing a use state in the fastening structure of FIG. 4;
【図１０】 実施例３の締結構造の縦断面図である。FIG. 10 is a longitudinal sectional view of a fastening structure according to a third embodiment.
【図１１】 図１１の締結構造における使用状態を示す
図である。FIG. 11 is a view showing a use state in the fastening structure of FIG. 11;
【図１２】 実施例３の締結構造を有するブロー成形体
の製造に用いる金型の斜視図である。FIG. 12 is a perspective view of a mold used for manufacturing a blow molded body having the fastening structure of the third embodiment.
【図１３】 実施例３の締結構造の締結構造を有するブ
ロー成形体の製造工程を説明するための側面図である。FIG. 13 is a side view for explaining a manufacturing process of a blow molded body having the fastening structure of the fastening structure of the third embodiment.
【図１４】 同じく平面図である。FIG. 14 is a plan view of the same.
【図１５】 同じく製造工程を説明するための側面図で
ある。FIG. 15 is a side view for explaining the manufacturing process.
【図１６】 実施例４の締結構造における使用状態を示
す図である。FIG. 16 is a diagram illustrating a use state of the fastening structure according to the fourth embodiment.
【図１７】 実施例４の締結構造を有するブロー成形体
の製造に用いる金型の要部斜視図である。FIG. 17 is a perspective view of a main part of a mold used for manufacturing a blow molded article having the fastening structure of the fourth embodiment.
【図１８】 実施例５の締結構造の平面図である。FIG. 18 is a plan view of a fastening structure according to a fifth embodiment.
【図１９】 実施例５の締結構造を有するブロー成形体
の製造に用いる金型の要部斜視図である。FIG. 19 is a perspective view of a main part of a mold used for manufacturing a blow molded article having the fastening structure of the fifth embodiment.
【図２０】 実施例６の締結構造の平面図である。FIG. 20 is a plan view of a fastening structure according to a sixth embodiment.
【図２１】 実施例６の締結構造の縦断面図である。FIG. 21 is a longitudinal sectional view of a fastening structure according to a sixth embodiment.
【図２２】 図２１からさらに９０度回転した方向から
見た縦断面図である。FIG. 22 is a longitudinal sectional view seen from a direction further rotated by 90 degrees from FIG. 21;
【図２３】 締結強度の試験方法を示す説明図である。FIG. 23 is an explanatory view showing a method for testing a fastening strength.
【図２４】 従来の締結構造を示す縦断面図である。FIG. 24 is a longitudinal sectional view showing a conventional fastening structure.
【図２５】 従来技術によるブロー成形法を示す説明図
である。FIG. 25 is an explanatory view showing a blow molding method according to a conventional technique.
１ 中空体 ２１、２２ 壁 ２３ 貫通穴 ３１〜４１ 補強リブ ４ ボルト ５ ナット ６１、６２ 金型 ７１ 貫通穴用のピン ７２、７３ 板状ピン ８ 吹込みノズル DESCRIPTION OF SYMBOLS 1 Hollow body 21, 22 Wall 23 Through hole 31-41 Reinforcement rib 4 Bolt 5 Nut 61, 62 Die 71 Pin for through hole 72, 73 Plate pin 8 Blowing nozzle
Claims (6)
の外壁面に溶着し、少なくとも一方の壁面に基部を有し
対向する壁面に向けて延びる補強リブを設けていること
を特徴とするブロー成形体の締結構造。1. A reinforcing rib which is welded to the outer wall surface of a cylindrical through-hole penetrating the opposing wall of a hollow body, has a base on at least one wall surface, and extends toward the opposing wall surface. Blow molded body fastening structure.
１〜４個設けられている請求項１記載の締結構造。2. The fastening structure according to claim 1, wherein one to four reinforcing ribs are provided on an outer wall surface of the cylindrical through hole.
の両方に基部を有するものである請求項１又は２に締結
構造。3. The fastening structure according to claim 1, wherein the reinforcing ribs have base portions on both of the opposing walls.
金型の間に、ヘッドから加熱軟化した合成樹脂製の筒状
パリソンを降下させ、次いで、両金型を閉じる方向に動
かすとともに、ブローノズルから高圧空気を吹き込むこ
とにより両金型の内部形状をかたどった外形状を有する
成形体を製造するブロー成形法において、少なくとも一
方の金型に貫通穴用のピンを設けると共に、上記筒状パ
リソンに縦方向の弛みをもたせ、加圧空気を吹き込むと
同時に貫通穴に沿って折皺を形成せしめることを特徴と
するブロー成形体における締結構造の製造方法。4. A heat-softened cylindrical parison made of synthetic resin is lowered from a head between two blow molding dies arranged opposite to each other, and then both dies are moved in a closing direction. In a blow molding method for producing a molded body having an outer shape that models the inner shape of both molds by blowing high-pressure air from a blow nozzle, at least one mold is provided with a pin for a through hole, and A method for manufacturing a fastening structure in a blow-molded article, characterized in that a parison has a slack in a vertical direction, and pressurized air is blown to form wrinkles along a through hole.
ブローの、空気量を調整することにより、縦方向弛みを
もたせることを特徴とする請求項４記載の方法。5. The method according to claim 4, wherein the parison pre-blow that has fallen between the molds has a longitudinal slack by adjusting the amount of air.
ンを突出させ、金型を閉じてパリソンの端を挟持したと
き、板状ピンでパリソンに縦方向の弛みもたせるように
したことを特徴とする請求項４に記載の製造方法。6. A plate-like pin is protruded in the vicinity of a pin for a through hole of a mold, and when the mold is closed and an end of a parison is clamped, the parison is allowed to have a slack in the vertical direction by the plate-like pin. The method according to claim 4, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000214723A JP3739254B2 (en) | 2000-07-14 | 2000-07-14 | Method for manufacturing blow molded article having bolt fastening structure and blow molded article |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000214723A JP3739254B2 (en) | 2000-07-14 | 2000-07-14 | Method for manufacturing blow molded article having bolt fastening structure and blow molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002028969A true JP2002028969A (en) | 2002-01-29 |
| JP3739254B2 JP3739254B2 (en) | 2006-01-25 |
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ID=18710250
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005226228A (en) * | 2004-02-10 | 2005-08-25 | Yagikuma:Kk | Clamp mounting structure for supporting leg for barricade |
-
2000
- 2000-07-14 JP JP2000214723A patent/JP3739254B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005226228A (en) * | 2004-02-10 | 2005-08-25 | Yagikuma:Kk | Clamp mounting structure for supporting leg for barricade |
| JP4286161B2 (en) * | 2004-02-10 | 2009-06-24 | 株式会社八木熊 | Barricade support leg clamp mounting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3739254B2 (en) | 2006-01-25 |
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