JPH0615759A - Method for molding structual part having hollow pipe part - Google Patents
Method for molding structual part having hollow pipe partInfo
- Publication number
- JPH0615759A JPH0615759A JP17555092A JP17555092A JPH0615759A JP H0615759 A JPH0615759 A JP H0615759A JP 17555092 A JP17555092 A JP 17555092A JP 17555092 A JP17555092 A JP 17555092A JP H0615759 A JPH0615759 A JP H0615759A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- resin
- hollow pipe
- pipe
- injected
- 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
Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14344—Moulding in or through a hole in the article, e.g. outsert moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基板部分と連続した中
空パイプ状部分とからなる構造部品において、該基板が
樹脂もしくは金属からなり、連続した中空パイプ状部分
が熱可塑性樹脂よりなる構造部品の成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural component comprising a substrate portion and a continuous hollow pipe-shaped portion, the substrate being made of resin or metal, and the continuous hollow pipe-shaped portion being made of a thermoplastic resin. Molding method.
【０００２】前記基板部分と連続したパイプ状部分から
なる構造部品は、例えば放熱または加熱のためにパイプ
内に温度調節された流体（液体もしくは気体）を通した
り、該連続した中空パイプ状部分に電線を通すなど種々
の分野に使用することができる。A structural component consisting of a pipe-shaped portion which is continuous with the substrate portion allows a temperature-regulated fluid (liquid or gas) to pass through the pipe for heat dissipation or heating, or to the continuous hollow pipe-shaped portion. It can be used in various fields such as passing an electric wire.
【０００３】[0003]
【従来の技術】基板部分と連続したパイプ状部分からな
る構造部品を成形する従来技術では以下に記載の問題点
を有していた。 基板部分に金属パイプを折り曲げ加工して取り付け
た構造部品を作製する際、金属の折り曲げ加工が困難で
あったり、折り曲げた金属パイプを基板に溶接する場合
熱歪みが生ずる等の種々の加工上の困難を伴う場合があ
る。2. Description of the Related Art The prior art for molding a structural component consisting of a pipe-shaped portion continuous with a substrate portion has the following problems. When manufacturing a structural part in which a metal pipe is bent and attached to the substrate part, it is difficult to fold the metal, or when the bent metal pipe is welded to the substrate, various strains occur such as thermal distortion. It can be difficult.
【０００４】 従来の射出成形法にて、基板部分とパ
イプ状部分とからなる構造部品を作製する場合、通常は
型開き方向にピンを立てたり、複雑なスライドピン機構
を金型内に設置する必要があった。このため、パイプ形
状に制約があり、自由な製品設計ができず、他の板材や
箱材等の基材と一体化した形状のものは少なかった。When manufacturing a structural part composed of a substrate part and a pipe-shaped part by a conventional injection molding method, a pin is usually set up in the mold opening direction or a complicated slide pin mechanism is installed in the mold. There was a need. For this reason, there are restrictions on the shape of the pipe, it is not possible to freely design products, and there are few shapes that are integrated with other base materials such as plate materials and box materials.
【０００５】 最近注目をあびているガスインジェク
ション法による成形法にて該基板部分とパイプ状部分と
からなる構造部品を同時に成形しようとする場合、例え
ば金型キャビティ内に溶融樹脂を充填した後、ひけ部分
に対して加圧ガス体を注入する方法では、通常金型キャ
ビティ内にガスの通路となるガスチャンネルを設けて成
形を行うが、この場合、ガスチャンネル内の溶融樹脂を
押出しながらガス体が樹脂内を伸びていくため、ガスチ
ャンネルの末端部では、押し出し切れない樹脂がガスチ
ャンネル内に残り、充分なパイプ形状が作製できない。In the case of simultaneously molding a structural part including the substrate portion and the pipe-shaped portion by a molding method using a gas injection method, which has recently attracted attention, for example, after filling a mold cavity with a molten resin, a sink mark is formed. In the method of injecting a pressurized gas body into a portion, molding is usually performed by providing a gas channel that serves as a gas passage in the mold cavity. Since it extends in the resin, the resin that cannot be extruded remains in the gas channel at the end portion of the gas channel, and a sufficient pipe shape cannot be manufactured.
【０００６】 金型キャビティ内に複数のガスチャン
ネルを平行設置した場合、製品肉厚が部分的に厚かった
りすると一方のガスチャンネルから加圧ガス体がはみ出
し、となりのガスチャンネルへ入り込んだりする。そう
すると、となりのガスチャンネル内には樹脂が残こり、
このため、該基板部分と連続した中空パイプ状部分を有
した構造部品を作製するのは困難である。When a plurality of gas channels are installed in parallel in the mold cavity, if the product wall thickness is partially thick, the pressurized gas body protrudes from one gas channel and enters the next gas channel. Then, the resin remains in the gas channel next to it,
Therefore, it is difficult to manufacture a structural component having a hollow pipe-shaped portion continuous with the substrate portion.
【０００７】 ガスインジェクション法による成形法
で、金型キャビティー内を樹脂で充填しないうちに、加
圧ガス体を注入する方法を用い該基板部分とパイプ状部
分を有した構造部品を成形した場合、パイプ状部分の加
圧ガス体の押出し樹脂のみでは、基板部分が未充填とな
りやすい。In the case of molding a structural part having the substrate portion and the pipe-shaped portion by a method of injecting a pressurized gas body before the mold cavity is filled with resin by a molding method by gas injection method The substrate portion is likely to be unfilled only with the extruded resin of the pressurized gas body of the pipe-shaped portion.
【０００８】[0008]
【発明が解決しようとする課題】本発明の目的は、該基
板部分とパイプ状部分とからなる構造部品において、基
板部分に自由に連続した中空化パイプ状部分を配置し、
また該パイプ状部分の長手方向形状の自由度をひろげ、
パイプ状部分の折曲げ部の管内径を充分にとる製造方法
と、該基板部分とパイプ状部分の材質差による線膨脹率
の違いによる反りを防止する方法を提供することにあ
る。DISCLOSURE OF THE INVENTION An object of the present invention is to arrange a hollowed pipe-shaped portion which is freely continuous with the substrate portion in a structural part composed of the substrate portion and the pipe-shaped portion.
Moreover, the degree of freedom of the longitudinal shape of the pipe-shaped portion is expanded,
It is an object of the present invention to provide a manufacturing method in which a pipe inner diameter of a bent portion of a pipe-shaped portion is sufficiently made, and a method of preventing warpage due to a difference in linear expansion coefficient due to a material difference between the substrate portion and the pipe-shaped portion.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、上記課題
を解決するため鋭意検討した結果、予め形成した基板部
分上のパイプ形成部分、もしくは第１段として射出成形
された基板部分上のパイプ形成部分に、溶融した熱可塑
性樹脂を金型キャビティ内に必要量射出後、加圧ガス体
を注入して中空構造物を得ることを利用して、基板部分
上または複数の基板部分の間に各々独立した中空パイプ
状部分を１箇所以上配置することが可能なことを見い出
し、本発明を完成させた。DISCLOSURE OF THE INVENTION As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a pipe-formed portion on a preformed substrate portion or a substrate portion injection-molded as a first stage After injecting a required amount of molten thermoplastic resin into the mold cavity in the pipe forming part, and then injecting a pressurized gas body to obtain a hollow structure, use it on the substrate part or between multiple substrate parts. It has been found that it is possible to arrange one or more independent hollow pipe-shaped portions in each of the above-mentioned embodiments, and the present invention has been completed.
【００１０】本発明は、Ａ法、即ち、射出成形機を使用
して、熱可塑性樹脂からなる中空パイプ状部分と樹脂も
しくは金属からなる基板部分から構成される構造部品を
成形するに際し、（１）該基板部分を予め射出成形機の
金型キャビティ内に装着し、（２）溶融樹脂を少なくと
も金型キャビティ内の該基板部上の中空パイプを形成す
る部分に必要量射出し、（３）更に、該パイプを形成す
る部分に加圧ガス体を注入して、該基板上に中空形状を
形成することを特徴とする中空パイプ部を有する構造部
品の成形方法およびThe present invention relates to a method A, that is, when an injection molding machine is used to mold a structural part composed of a hollow pipe-shaped portion made of a thermoplastic resin and a substrate portion made of a resin or a metal. ) The substrate part is mounted in advance in a mold cavity of an injection molding machine, and (2) a necessary amount of molten resin is injected into at least a part of the mold cavity where a hollow pipe is formed on the substrate part, and (3) Further, a method for molding a structural component having a hollow pipe portion, characterized by forming a hollow shape on the substrate by injecting a pressurized gas body into a portion where the pipe is formed, and
【００１１】Ｂ法、即ち、射出成形機を使用して、熱可
塑性樹脂からなる中空パイプ状部分と上記熱可塑性樹脂
と同一もしくは異種の樹脂からなる基板部分から構成さ
れる構造部品を成形するに際し、（１）第１段として、
金型キャビティの基板部分に溶融樹脂を射出して基板部
分を形成し、（２）第２段として、前記金型キャビティ
若しくは前記金型に他のキャビティを組み合わせて、同
一樹脂を使用する場合は同一射出シリンダーより、異種
の樹脂を使用する場合は他の射出シリンダーより溶融樹
脂を少なくとも前記金型キャビティ内の該基板部上の中
空パイプを形成する部分に必要量射出し、（３）更に、
該パイプを形成する部分に加圧ガス体を注入して、該基
板上に中空形状を形成することを特徴とする中空パイプ
部を有する構造部品の成形方法に関する発明である。In the method B, that is, when an injection molding machine is used to mold a structural part composed of a hollow pipe-shaped portion made of a thermoplastic resin and a substrate portion made of a resin which is the same as or different from the thermoplastic resin. , (1) As the first stage,
When the molten resin is injected into the substrate portion of the mold cavity to form the substrate portion, and (2) as the second stage, when the same resin is used by combining the mold cavity or another cavity with the mold, When using different resins from the same injection cylinder, a required amount of molten resin is injected from at least another injection cylinder into at least a portion forming the hollow pipe on the substrate portion in the mold cavity, and (3) further,
The invention relates to a method for molding a structural component having a hollow pipe portion, which comprises injecting a pressurized gas into a portion where the pipe is formed to form a hollow shape on the substrate.
【００１２】本発明において、中空パイプ状部分を形成
する樹脂として、通常の熱可塑性樹脂すなわちポリオレ
フィン樹脂、ポリスチレン樹脂、ＡＢＳ樹脂、ＡＳ樹
脂、ＰＶＣ樹脂、メタアクリル樹脂、含フッ素樹脂等で
例示される汎用の熱可塑性樹脂はもとより、ナイロン樹
脂、飽和ポリエステル樹脂、ポリカーボネート樹脂、ポ
リアクリレート樹脂、ポリアセタール樹脂、ポリスルホ
ン樹脂、変性ポリフェニレンエーテル樹脂等で例示され
るいわゆるエンジニアリングプラスチックスを使用する
ことができる。本発明のＡ法において、基板部分を構成
する金属として、鉄、銅、アルミニウム、およびステン
レススチールを例示することができ、又、基板部分を構
成する樹脂として、前記中空パイプ状部分を形成する熱
可塑性樹脂の他、フェノール樹脂、不飽和ポリエステル
樹脂、メラミン樹脂等の熱硬化性樹脂を使用することが
できる。In the present invention, as the resin forming the hollow pipe-shaped portion, a usual thermoplastic resin, that is, a polyolefin resin, a polystyrene resin, an ABS resin, an AS resin, a PVC resin, a methacrylic resin, a fluorine-containing resin or the like is exemplified. In addition to general-purpose thermoplastic resins, so-called engineering plastics exemplified by nylon resins, saturated polyester resins, polycarbonate resins, polyacrylate resins, polyacetal resins, polysulfone resins, modified polyphenylene ether resins and the like can be used. In the method A of the present invention, examples of the metal forming the substrate portion include iron, copper, aluminum, and stainless steel, and as the resin forming the substrate portion, heat for forming the hollow pipe-shaped portion. In addition to the plastic resin, a thermosetting resin such as phenol resin, unsaturated polyester resin or melamine resin can be used.
【００１３】又、本発明のＢ法において、基板部分を構
成する樹脂として、前記中空パイプ状部分を形成する熱
可塑性樹脂が例示できる。基板と中空パイプ部に使用す
る樹脂は同種であっても異種であってもよいが、異種の
場合両樹脂が溶着するものを選択することが好ましい。In the method B of the present invention, the resin forming the substrate portion may be a thermoplastic resin forming the hollow pipe-shaped portion. The resin used for the substrate and the hollow pipe portion may be the same or different, but in the case of different types, it is preferable to select a resin that both resins are welded to.
【００１４】本発明の好ましい成形方法を以下に詳述す
る。 （１）Ａ法 基板部分をまず金型キャビティー内に装着した場合、金
型キャビティー内の中空パイプ部を形成部分が一連の流
路を形成できるように金型キャビティーを設計する必要
がある。この場合、一連の流路の幅および高さが必要と
するパイプ形状の外側形状となるように、またパイプ形
状の長手方向の端部は、後加工としておこなわれる機械
化工と中空部確保のため、必要寸法より１０ｍｍ以上は
長くとるように、固定側金型キャビティーブロックに彫
り込むのが望ましい。ただし、このパイプ形状は型開き
方向に対してスムースに抜ける形状でなければならな
い。また、樹脂ゲートは、この一連の流路の端部に配置
され且つ、加圧ガス体が注入されるガスゲートも同じ流
路の同じ側の端部に設置される。The preferred molding method of the present invention is described in detail below. (1) Method A When the substrate part is first mounted in the mold cavity, it is necessary to design the mold cavity so that the part forming the hollow pipe part in the mold cavity can form a series of flow paths. is there. In this case, the width and height of the series of flow paths should be the outer shape of the pipe shape that is required, and the end of the pipe shape in the longitudinal direction should be used as a post-processing mechanic and to secure the hollow portion. It is desirable to engrave in the fixed side mold cavity block so that the length is 10 mm or more longer than the required size. However, this pipe shape must be a shape that can smoothly escape in the mold opening direction. Further, the resin gate is arranged at the end of this series of flow paths, and the gas gate into which the pressurized gas body is injected is also installed at the end on the same side of the same flow path.
【００１５】金型内に装着する該基板部分が金属の場
合、または樹脂の場合でもパイプ状部分に用いる熱可塑
性樹脂との接着性の悪い樹脂である場合は、該パイプ状
部分との接合箇所に応じて、プレートの上または側面に
アンダーカット処理をおこなうか、または砂や紙やす
り、薬品、電極等で接合面にきづをつけて荒い面にして
おくか、あるいは、エポキシ樹脂等の接着剤を塗布して
おく等の前処理を施しておく必要がある。If the substrate portion to be mounted in the mold is a metal, or even if it is a resin that has poor adhesion to the thermoplastic resin used for the pipe-shaped portion, the joint portion with the pipe-shaped portion Depending on the situation, undercut the top or side of the plate, or make a rough surface by scratching the joint surface with sand, sandpaper, chemicals, electrodes, etc., or by adhering epoxy resin, etc. It is necessary to carry out a pretreatment such as applying the agent.
【００１６】また、該基板部分とパイプ状部分との材質
差による線膨脹率の違いにより、製品に反りが発生する
恐れのある場合は、図１に例示するように該基板部分と
パイプ状部分のあわせまたはつなぎ面に、０．０１〜１
０ｍｍ程度の間隙幅をとり、且つ図２に示すようなかん
合状態（アンダーカット）となるように金型キャビティ
ーを加工するか別部品をインサートするかまたは、基板
部分とパイプ状部分をスポット的に接合するようにす
る。When there is a possibility that the product warps due to the difference in linear expansion coefficient due to the material difference between the substrate portion and the pipe-shaped portion, the substrate portion and the pipe-shaped portion are exemplified as shown in FIG. 0.01 to 1 on the mating or joining surface
Take a gap of about 0 mm and process the mold cavity so that the mating state (undercut) as shown in FIG. 2 is obtained, or insert another part, or spot the substrate part and the pipe part. To be joined together.
【００１７】上記のように、基板部分を金型キャビティ
内に装着した後、シリンダー内にて溶融した熱可塑性樹
脂を一定量に計量したのち、金型キャビティー内へ射出
注入する。但し、この溶融樹脂の注入量は、金型キャビ
ティーを充填するに足らない量であり、且つ加圧ガス体
が注入された場合にキャビティー内を充填する量とする
必要がである。As described above, after the substrate portion is mounted in the mold cavity, the molten thermoplastic resin is weighed in a predetermined amount in the cylinder and then injected and injected into the mold cavity. However, the amount of the molten resin injected is not enough to fill the mold cavity, and it is necessary to fill the cavity when the pressurized gas body is injected.
【００１８】前記溶融した熱可塑性樹脂が該キャビティ
ー内へすべて射出注入されたと同時かやや遅くに、加圧
ガス体を金型内に設置されたガスノズルを介して該ガス
ゲート内へ注入する。加圧ガス体としては通常窒素ガス
を用いるのが望ましい。該溶融した樹脂は加圧ガス体に
より押し延ばされながら、金型内に設けられたキャビテ
ィーの流路に添って流れる。該溶融樹脂が流路末端まで
加圧ガス体にて押し延ばされたのち、該加圧ガス体によ
り溶融樹脂の内部から圧力がかかり、金型に転写され、
且つ、基板部分との接合が金型キャビティー内でなされ
る。該溶融樹脂が、冷却固化したのち、中空部内の圧力
を大気圧とし、型開きをおこなって、基板部分と連続し
た中空構造部分が一体化した製品を取り出す。At the same time as the molten thermoplastic resin is completely injected and injected into the cavity, a pressurized gas body is injected into the gas gate through a gas nozzle installed in the mold. As the pressurized gas body, it is usually desirable to use nitrogen gas. The molten resin flows along the flow path of the cavity provided in the mold while being pushed and spread by the pressurized gas body. After the molten resin is pushed to the end of the flow path with a pressurized gas body, pressure is applied from the inside of the molten resin by the pressurized gas body and transferred to a mold,
Moreover, the bonding with the substrate portion is made in the mold cavity. After the molten resin is cooled and solidified, the pressure in the hollow portion is set to atmospheric pressure, the mold is opened, and a product in which a hollow structure portion continuous with the substrate portion is integrated is taken out.
【００１９】次に、必要により前記基板部分と中空構造
部分が一体化した成形品の連続した中空構造部分の両端
を、機械加工にて必要な位置と形状に切削して、該基板
部分と連続した中空パイプ状部分が一体化した構造部品
を得る。Next, if necessary, both ends of the continuous hollow structure portion of the molded product in which the substrate portion and the hollow structure portion are integrated are machined to a required position and shape to be continuous with the substrate portion. A structural part in which the hollow pipe-shaped portion is integrated is obtained.
【００２０】（２）Ｂ法 本成形方法は、基板部分に熱可塑性樹脂を用いた場合に
限られ、第１段として基板部分を射出成形した後、第２
段として同一の射出成形機にて連続的に中空構造部分を
成形して、型開きおよび製品取り出し時に一体化した製
品を得る連続法である。(2) Method B This molding method is limited to the case where a thermoplastic resin is used for the substrate portion, and after the substrate portion is injection molded as the first stage, the second molding method is performed.
This is a continuous method in which a hollow structure portion is continuously molded by the same injection molding machine as a step to obtain an integrated product when the mold is opened and the product is taken out.
【００２１】Ｂ法においては、金型構造としては、基板
部分と中空構造部分の各々に樹脂ゲートを設ける必要が
あり、通常射出成形機のシリンダは２以上であるが、基
板部分と中空構造部分に同一樹脂を使用する場合は射出
成形機のシリンダは１とすることも可能である。In the method B, as the mold structure, it is necessary to provide a resin gate in each of the substrate portion and the hollow structure portion, and usually there are two or more cylinders of the injection molding machine, but the substrate portion and the hollow structure portion. When the same resin is used for the injection molding machine, the number of cylinders may be one.
【００２２】射出成形機のシリンダが１の場合、金型内
のランナー部で基板部分につながる流路と中空構造部分
につながる流路とに別け、尚かつ、一方の方向が選択さ
れる工夫、例えば電磁、油圧式または手動の３方向弁を
使用する必要がある。金型は、多材質射出成形法におい
て複数の樹脂を段階的に射出する際に使用されているよ
うな金型、すなわち、金型コアを回転させることによっ
て異なったキャビティ空間を連続的に形成する回転方
式、または金型コアの一部を可動とし、一次成形用二次
成形用のキャビティ空間を形成するコアバック方式を使
用することができる。When the number of cylinders of the injection molding machine is one, the runner portion in the mold is divided into a flow passage leading to the substrate portion and a flow passage leading to the hollow structure portion, and one direction is selected. For example, it is necessary to use electromagnetic, hydraulic or manual three-way valves. The mold is a mold that is used when a plurality of resins are injected in stages in a multi-material injection molding method, that is, different cavity spaces are continuously formed by rotating a mold core. A rotation system or a core back system in which a part of the mold core is movable to form a cavity space for primary molding and secondary molding can be used.
【００２３】加圧ガス体を注入するゲートは、樹脂ゲー
トと同じ側の中空部分の端部に設けるのが望ましい。The gate for injecting the pressurized gas body is preferably provided at the end of the hollow portion on the same side as the resin gate.
【００２４】樹脂の射出工程について以下に説明する。
先ず、金型キャビティの基板部分に相当する部分に溶融
樹脂を射出する。次に金型の回転や油圧駆動などで一段
目の成形品に接合した空間キャビティを形成させ、前記
一段目に射出した樹脂が流動性を失った後に、中空部を
形成するキャビティ部分に溶融樹脂を射出する。溶融樹
脂の射出量は パイプ状部分を充填するに足らなく、且
つ加圧ガス体が注入された場合、パイプ状部分が溶融樹
脂により充填される樹脂量を射出成形機より射出注入す
る。The resin injection process will be described below.
First, molten resin is injected into a portion of the mold cavity corresponding to the substrate portion. Next, a space cavity joined to the first-stage molded product is formed by rotation of the mold or hydraulic drive, and after the resin injected in the first stage loses fluidity, the molten resin is formed in the cavity forming the hollow portion. Inject. The injection amount of the molten resin is insufficient to fill the pipe-shaped portion, and when the pressurized gas body is injected, the amount of the resin that fills the pipe-shaped portion with the molten resin is injected from the injection molding machine.
【００２５】金型キャビティーの中空部を形成する部分
に溶融樹脂の注入が完了するのと同時かやや遅くに加圧
ガス体を該溶融樹脂内へ注入し、保圧をおこなう。金型
キャビティー内の溶融樹脂が冷却固化したのち、パイプ
状部分の加圧ガス体を大気圧に下げ、型開きをおこない
製品を取り出す。At the same time as the injection of the molten resin is completed in the portion forming the hollow portion of the mold cavity, the pressurized gas body is injected into the molten resin to hold the pressure. After the molten resin in the mold cavity is cooled and solidified, the pressurized gas body in the pipe-shaped portion is lowered to atmospheric pressure, the mold is opened, and the product is taken out.
【００２６】前記方法で、キャビティー内の基板部分と
なっている隙間からガス体が抜けることにより、中空構
造部分のガス保圧ができない場合、該板状部分として金
型内に設けられているキャビティー部分を別ブロックと
する。該中空構造部分を溶融樹脂に加圧ガス体を注入し
て成形する際は、キャビティー内の該板状部分のブロッ
クをスライド機構等により動かし、金型キャビティー内
の板状部分としての間隙をなくすることで、中空構造部
分に加圧ガス体による保圧をかけてもガス抜けはおこら
ず、中空構造部分を成形することができる。According to the above-mentioned method, when the gas pressure cannot be retained in the hollow structure portion due to the escape of the gas body from the gap serving as the substrate portion in the cavity, the plate-shaped portion is provided in the mold. Separate the cavity part. When molding the hollow structure portion by injecting a pressurized gas body into the molten resin, the block of the plate-shaped portion in the cavity is moved by a slide mechanism or the like to form a gap as the plate-shaped portion in the mold cavity. By eliminating the above, the hollow structure portion can be molded without degassing even if the pressure is applied to the hollow structure portion by the pressurized gas body.
【００２７】次に、別ブロックとなっている基板部分を
スライド機構等により、必要な基板肉厚となるように動
かして、再度基板部分を射出成形し、板状部分と中空構
造部分が一体化した成形品を金型内より、取り出す。つ
ぎに、連続した中空構造部分の両端部を機械加工にて必
要なパイプ形状とし、基板部分と連続したパイプ状部分
が一体化した構造部品を得る。Next, the substrate portion, which is a separate block, is moved by a slide mechanism or the like so as to have a required substrate thickness, and the substrate portion is injection-molded again, and the plate portion and the hollow structure portion are integrated. Take out the molded product from the mold. Next, both ends of the continuous hollow structure portion are machined into pipe shapes required to obtain a structural component in which the pipe portion continuous with the substrate portion is integrated.
【００２８】前記（１）及び（２）に記した製造方法に
より、基板部分と連続した中空パイプ状部分を有した構
造部品を得ることができるが、該金型内に設けた連続し
た中空構造部分の樹脂流路には、いろいろパターンがあ
る。例えば、曲がりくねったものや枝別れのもの、また
樹脂ゲートを２個以上設置し、樹脂ゲートと同数のガス
ゲートを設けて複数個の樹脂経路を有したものがある。
前述のいろいろな樹脂経路の金型を用いて中空構造部分
を成形し、両端部を機械加工することにより、いろいろ
な連続した中空パイプ状部分を得ることができる。By the manufacturing method described in the above (1) and (2), it is possible to obtain a structural component having a hollow pipe-shaped portion which is continuous with the substrate portion, but the continuous hollow structure provided in the mold. There are various patterns in the part of the resin flow path. For example, there are a winding type, a branch type, and a type having two or more resin gates, the same number of gas gates as the resin gates, and a plurality of resin paths.
Various continuous hollow pipe-shaped portions can be obtained by molding the hollow structure portion using the above-mentioned various resin path molds and machining both end portions.
【００２９】前記基板部分が２個以上の場合、該熱可塑
性樹脂によるパイプ状部分を該基板部分の間に設けた構
造部品も可能である。この場合、基板部分の間が樹脂流
路となり各基板部分の端部と一体化されるようになる。
また、この場合は、全体として板状あるいは箱状または
パイプ状とすることができる。When the number of the substrate portions is two or more, a structural part in which a pipe-shaped portion made of the thermoplastic resin is provided between the substrate portions is also possible. In this case, a resin flow path is formed between the substrate portions and integrated with the end portion of each substrate portion.
Further, in this case, the plate shape, the box shape, or the pipe shape can be used as a whole.
【００３０】そり低減方法として前記板状部分とパイプ
状部分に間隙を設ける方法の他、パイプ状部分の経路が
ストレートよりも湾曲して蛇行したものやクランク状の
ものがそりが少なくなる。また基板部分とパイプ状部分
を噛み合わせる方法もある。As a method of reducing warpage, in addition to the method of providing a gap between the plate-shaped portion and the pipe-shaped portion, there is less warpage when the path of the pipe-shaped portion is curved rather than straight and meandered or crank-shaped. There is also a method of engaging the substrate portion and the pipe-shaped portion.
【００３１】[0031]
【発明の効果】本発明によれば、基板部分とパイプ状部
分を有した構造部品を射出成形にて成形できるため、短
時間に多量の同一品が得られ、、生産性も向上する。According to the present invention, since a structural part having a substrate portion and a pipe-shaped portion can be molded by injection molding, a large amount of the same product can be obtained in a short time and the productivity is improved.
【００３２】[0032]
【実施例】以下、本発明を実施例に基づき説明する。ポ
リカーボネート樹脂（三菱ガス化学（株）製、商品名：
ユーピロンＮＦ２０００）を長さ４５０ｍｍ、幅３００
ｍｍ、厚み３ｍｍのシート状に成形したものを金型キャ
ビティ内に装着し、該シート表面の中空パイプを形成す
る部分に、上辺８ｍｍ、底辺１２ｍｍ、高さ１０ｍｍの
台形状で長さ方向に平行に幅方向からそれぞれ１００ｍ
ｍの位置に、パイプ部がシートよりも両端が１０ｍｍ長
くなる２本のパイプを形成するような形状をしたキャビ
ティ内に溶融したポリカーボネート樹脂（三菱ガス化学
（株）製、商品名：ユーピロンＳ３０００）をキャビテ
ィの容積の７５％を満たすように射出した。射出する際
の射出シリンダー内の溶融樹脂の温度は２９０℃、射出
圧は８００ｋｇ／ｃｍ2 であった。EXAMPLES The present invention will be described below based on examples. Polycarbonate resin (Mitsubishi Gas Chemical Co., Ltd., trade name:
Iupilon NF2000) length 450mm, width 300
mm shaped sheet having a thickness of 3 mm is mounted in the mold cavity, and a trapezoidal shape having an upper side of 8 mm, a bottom side of 12 mm and a height of 10 mm is parallel to the length direction in the portion of the sheet surface where the hollow pipe is formed. 100m from the width direction
At the position of m, the polycarbonate resin melted in the cavity shaped to form two pipes whose both ends are 10 mm longer than the sheet at the position of m (Mitsubishi Gas Chemical Co., Ltd., trade name: Iupilon S3000) Was injected to fill 75% of the cavity volume. The temperature of the molten resin in the injection cylinder during injection was 290 ° C., and the injection pressure was 800 kg / cm 2 .
【００３３】樹脂の射出終了と同時に、パイプ状部分の
樹脂ゲートと同一端部にあるガスゲートより窒素ガスを
圧入した。溶融樹脂は窒素ガスの圧入した部位の反対方
向の端部まで押し出された後、窒素ガスの圧力４０ｋｇ
／ｃｍ2 で保持した状態で樹脂を冷却した。キャビティ
中空部内の窒素ガス圧を大気圧まで下げて離型後成形品
を取り出した。該成形品のパイプ部の両端１０ｍｍを切
断し、連続した中空部を有する構造部品を得た。Simultaneously with the completion of the injection of the resin, nitrogen gas was injected under pressure from the gas gate at the same end as the resin gate in the pipe-shaped portion. The molten resin was extruded to the end in the opposite direction of the site where nitrogen gas was injected, and then the pressure of nitrogen gas was 40 kg
The resin was cooled while being held at / cm 2 . The nitrogen gas pressure in the hollow portion of the cavity was lowered to atmospheric pressure, and the molded product was taken out after the mold release. Both ends of the pipe portion of the molded product were cut at 10 mm to obtain a structural component having a continuous hollow portion.
【図１】基板部分とパイプ状部分の間にそり防止のため
の間隙を設けた構造部品の長さ方向の断面図の例を示
す。FIG. 1 shows an example of a cross-sectional view in the lengthwise direction of a structural component in which a gap for preventing warpage is provided between a substrate portion and a pipe-shaped portion.
【図２】金属製の基板にかん合状態を形成するように中
空パイプを射出成形した構造部品の幅方向の断面図の例
を示す。FIG. 2 shows an example of a cross-sectional view in the width direction of a structural component in which a hollow pipe is injection-molded so as to form a mated state on a metal substrate.
１：金属製基板 ２：熱可塑性樹脂 ３：中空部 1: Metal substrate 2: Thermoplastic resin 3: Hollow part
Claims (4)
らなる中空パイプ状部分と樹脂もしくは金属からなる基
板部分から構成される構造部品を成形するに際し、
（１）該基板部分を予め射出成形機の金型キャビティ内
に装着し、（２）溶融樹脂を少なくとも金型キャビティ
内の該基板部上の中空パイプ部を形成する部分に必要量
射出し、（３）更に、該パイプを形成する部分に加圧ガ
ス体を注入して、該基板上に中空パイプ形状を形成する
ことを特徴とする中空パイプ部を有する構造部品の成形
方法。1. When molding a structural part composed of a hollow pipe-shaped portion made of a thermoplastic resin and a substrate portion made of a resin or a metal by using an injection molding machine,
(1) The substrate part is mounted in advance in a mold cavity of an injection molding machine, and (2) a required amount of molten resin is injected into at least a part of the mold cavity forming a hollow pipe part on the substrate part, (3) A method for molding a structural component having a hollow pipe portion, further comprising injecting a pressurized gas body into a portion where the pipe is formed to form a hollow pipe shape on the substrate.
らなる中空パイプ部分と熱可塑性樹脂からなる基板部分
から構成される構造部品を成形するに際し、（１）該基
板部分を予め射出成形機の金型キャビティ内に装着し、
（２）溶融樹脂を少なくとも金型キャビティ内の該基板
部上の中空パイプを形成する部分に必要量射出して該基
板部分に熱融着し、（３）更に、該パイプを形成する部
分に加圧ガス体を注入して、該基板上に中空形状を形成
することを特徴とする請求項１に記載の中空パイプ部を
有する構造部品の成形方法。2. When molding a structural part composed of a hollow pipe portion made of a thermoplastic resin and a substrate portion made of a thermoplastic resin by using an injection molding machine, (1) the substrate portion is previously injection-molded. Mounted in the mold cavity of the machine,
(2) A necessary amount of the molten resin is injected at least into a portion of the mold cavity where the hollow pipe is formed on the substrate portion, and heat fusion is performed to the substrate portion. (3) Further, to a portion where the pipe is formed. The method for molding a structural component having a hollow pipe portion according to claim 1, wherein a pressurized gas body is injected to form a hollow shape on the substrate.
らなる中空パイプ状部分と金属からなる基板部分から構
成される構造部品を成形するに際し、（１）該金属基板
部分を予め射出成形機の金型キャビティ内に装着し、
（２）溶融樹脂を少なくとも金型キャビティ内の該基板
部上の中空パイプを形成する部分に必要量射出して該金
属基板部分とかん合状態を形成させ、（３）更に、該パ
イプを形成する部分に加圧ガス体を注入して、該基板上
に中空形状を形成することを特徴とする請求項１に記載
の中空パイプ部を有する構造部品の成形方法。3. When molding a structural component composed of a hollow pipe-shaped portion made of a thermoplastic resin and a substrate portion made of a metal by using an injection molding machine, (1) the metal substrate portion is previously injection-molded. Mounted in the mold cavity of the machine,
(2) A required amount of molten resin is injected into at least a portion of the substrate cavity where a hollow pipe is formed in the mold cavity to form a mated state with the metal substrate portion. (3) Further, the pipe is formed. The method for molding a structural component having a hollow pipe portion according to claim 1, wherein a pressurized gas body is injected into a portion to be formed to form a hollow shape on the substrate.
らなる中空パイプ部分と上記熱可塑性樹脂と同一もしく
は異種の樹脂からなる基板部分から構成される構造部品
を成形するに際し、（１）第１段として、金型キャビテ
ィの基板を構成する部分に射出シリンダーより溶融樹脂
を射出して基板部分を形成し、（２）第２段として、前
記金型キャビティ若しくは前記金型に他のキャビティを
組み合わせて、同一樹脂を使用する場合は同一もしくは
他の射出シリンダーより、異種の樹脂を使用する場合は
他の射出シリンダーより溶融樹脂を少なくとも前記金型
キャビティ内の該基板部上の中空パイプ部を形成する部
分に必要量射出し、（３）更に、該パイプを形成する部
分に加圧ガス体を注入して、該基板上に中空形状を形成
することを特徴とする中空パイプ部を有する構造部品の
成形方法。4. When molding a structural part composed of a hollow pipe part made of a thermoplastic resin and a substrate part made of a resin which is the same as or different from the thermoplastic resin by using an injection molding machine, (1) As a first step, molten resin is injected from the injection cylinder into a portion of the mold cavity that constitutes the substrate to form a substrate portion. (2) As a second step, the die cavity or another cavity in the die. Hollow pipe part on the substrate part in the mold cavity at least the molten resin from the same or another injection cylinder when using the same resin, and from the other injection cylinder when using different resins A required amount is injected into a portion where the pipe is formed, and (3) a pressurized gas body is further injected into a portion where the pipe is formed to form a hollow shape on the substrate. A method of molding a structural part having a hollow pipe part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17555092A JP3326200B2 (en) | 1992-07-02 | 1992-07-02 | Method of forming structural part having hollow pipe-shaped part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17555092A JP3326200B2 (en) | 1992-07-02 | 1992-07-02 | Method of forming structural part having hollow pipe-shaped part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0615759A true JPH0615759A (en) | 1994-01-25 |
| JP3326200B2 JP3326200B2 (en) | 2002-09-17 |
Family
ID=15998045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17555092A Expired - Lifetime JP3326200B2 (en) | 1992-07-02 | 1992-07-02 | Method of forming structural part having hollow pipe-shaped part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3326200B2 (en) |
-
1992
- 1992-07-02 JP JP17555092A patent/JP3326200B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3326200B2 (en) | 2002-09-17 |
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