JP3241490B2 - Method for producing resin tubular body - Google Patents
Method for producing resin tubular bodyInfo
- Publication number
- JP3241490B2 JP3241490B2 JP13541293A JP13541293A JP3241490B2 JP 3241490 B2 JP3241490 B2 JP 3241490B2 JP 13541293 A JP13541293 A JP 13541293A JP 13541293 A JP13541293 A JP 13541293A JP 3241490 B2 JP3241490 B2 JP 3241490B2
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- resin
- mold
- tubular body
- molten resin
- 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.)
- Expired - Fee Related
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
- B29C45/17—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
- B29C2045/1719—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 making tubular 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
- B29C45/17—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
- B29C2045/1724—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 hollows used as conduits
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、内面が滑らかでしかも
肉厚の均一な樹脂製管状体の製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a resin tubular body having a smooth inner surface and a uniform wall thickness.
【０００２】[0002]
【従来の技術】従来、自動車のフューエルディストリビ
ュータパイプ等の成形方法としては、次に説明するよう
な方法が知られている。2. Description of the Related Art Conventionally, the following method has been known as a method for forming a fuel distributor pipe of an automobile.
【０００３】この従来の方法は、図６の（ａ）に示すよ
うに、キャビティ１０５内へ溶融樹脂を射出する樹脂通
路１０４をもつ分割型式の金型１０１，１０２を用い、
予め成形しておいた小径筒部材１０３を樹脂通路１０４
に連通するようにセットした状態で型閉じしたのち、樹
脂通路１０４を通してキャビティ１０５内へ所定量の樹
脂成形材料１０６を射出する。ついで、図６の（ｂ）お
よび（ｃ）に示すように、射出された樹脂成形材料１０
６中に加圧気体を注入することによってキャビティ１０
５に沿って中空成形品本体１０９を成形する。In this conventional method, as shown in FIG. 6A, divided molds 101 and 102 having a resin passage 104 for injecting a molten resin into a cavity 105 are used.
The small-diameter cylindrical member 103 formed in advance is
After the mold is closed in a state where it is set so as to communicate with the resin, a predetermined amount of resin molding material 106 is injected into the cavity 105 through the resin passage 104. Next, as shown in FIGS. 6B and 6C, the injected resin molding material 10
6 by injecting a pressurized gas into the cavity 10.
The hollow molded article main body 109 is formed along 5.
【０００４】[0004]
【発明が解決しようとする課題】しかし上記従来の技術
では、キャビティ内へ射出された樹脂成形材料中に注入
される加圧気体の圧力によって前記樹脂成形材料の先端
壁面が内部から突き破られてピンホールが開いてしまい
成形不良となるおそれがある。また、例え中空成形品本
体を無事成形できたとしても、加圧気体による内圧によ
ってキャビティ内に射出された樹脂成形材料を一挙にキ
ャビティ全体に膨張させるため、前記樹脂成形材料がキ
ャビティ内で良好に流展することができず、中空成形品
本体内面に波のような凹凸が形成されて肉厚が不均一と
なるという問題点があった。However, in the above-mentioned prior art, the front wall of the resin molding material is pierced from the inside by the pressure of the pressurized gas injected into the resin molding material injected into the cavity. There is a possibility that a pinhole is opened and molding failure occurs. Further, even if the hollow molded article main body can be molded safely, the resin molding material injected into the cavity by the internal pressure of the pressurized gas expands all over the cavity at once, so that the resin molding material is favorably formed in the cavity. There is a problem that the flow cannot be carried out, and irregularities such as waves are formed on the inner surface of the hollow molded article main body, and the thickness becomes uneven.
【０００５】本発明は、上記従来の技術の有する問題点
に鑑みてなされたものであって、内面が滑らかであって
しかも肉厚の均一な樹脂製管状体を簡単に成形すること
ができる樹脂製管状体の製造方法を実現することを目的
とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in view of the above circumstances. An object of the present invention is to realize a method for manufacturing a tubular body.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の樹脂製管状体の製造方法は、樹脂製管状体
となる部分およびその両端に一体成形された不要部から
なる中空成形品の外周面を規制するキャビティを有する
分割型式の金型を前記キャビティの一端へコア型の先端
部を突出させて型締めしたのち、前記コア型の先端部を
包み込むように溶融樹脂を前記キャビティ内へ射出注入
して溶融樹脂からなる有底筒状体を形成し、ついで前記
コア型を介して加圧流体を前記有底筒状体内へ注入して
膨張させつつ前記溶融樹脂の射出注入を継続して行うこ
とで、前記有底筒状体の膨張に見合う前記溶融樹脂を補
充して前記キャビティに沿って前記中空成形品を成形
し、ついで金型中で冷却したのち、前記不要部を切除す
ることを特徴とするものである。In order to achieve the above object, a method of manufacturing a resin tubular body according to the present invention is directed to a method of forming a hollow body comprising a portion to be a resin tubular body and unnecessary portions integrally formed at both ends thereof. After the mold of the split type having a cavity for regulating the outer peripheral surface of the product is clamped by projecting the tip of the core mold to one end of the cavity, the molten resin is filled into the cavity so as to wrap the tip of the core mold. To form a bottomed cylindrical body made of a molten resin by injecting into the inside, and then injecting and injecting the molten resin while injecting and expanding a pressurized fluid into the bottomed cylindrical body through the core mold. By continuously performing, the hollow resin article is refilled with the molten resin corresponding to the expansion of the bottomed cylindrical body, the hollow molded article is molded along the cavity, and then cooled in a mold. Characterized by excision Than it is.
【０００７】[0007]
【作用】溶融樹脂をキャビティ内へ射出注入してコア型
の先端部を包み込むように溶融樹脂からなる有底筒状体
を形成し、ついで前記コア型を介して加圧流体を前記有
底筒状体内へ注入して膨張させつつ、前記溶融樹脂の射
出注入を継続して行うことで前記有底筒状体の膨張に見
合う溶融樹脂が補充されるため、キャビティに沿って均
一に膨張し、両端部の不要部以外は均一な肉厚の中空成
形品を成形できる。このため、前記中空成形品の両端部
の不要部を切除して均一な肉厚の樹脂製管状体を得るこ
とができる。The molten resin is injected into the cavity to form a bottomed cylindrical body made of the molten resin so as to surround the tip of the core mold, and then pressurized fluid is supplied through the core mold to the bottomed cylinder. While injecting and expanding into the body, molten resin is added to match the expansion of the bottomed tubular body by continuously performing injection and injection of the molten resin, so that it expands uniformly along the cavity, Except for unnecessary portions at both ends, a hollow molded product having a uniform thickness can be formed. Therefore, unnecessary portions at both ends of the hollow molded product can be cut off to obtain a resin-made tubular body having a uniform thickness.
【０００８】[0008]
【実施例】本発明の実施例を図面に基いて説明する。An embodiment of the present invention will be described with reference to the drawings.
【０００９】図１は、本発明によって製造された樹脂製
管状体の一例を示す斜視図であって、樹脂製管状体１
は、図示Ｘ軸方向に延在する一方の接続部２と、一方の
接続部２から一方の屈曲部５ａで屈曲し図示Ｙ軸方向へ
延在する中央部３と、中央部３から他方の屈曲部５ｂで
屈曲し図示Ｚ軸方向へ延在する他方の接続部４からなる
三次元方向に屈曲したものであって、各接続部２，４の
端部近傍の外周面にはそれぞれホース等を接続して固定
するための一対の突条２ａ，４ａが突設されている。図
１中において一点鎖線で示す一方の不要部６および他方
の不要部７は、樹脂製管状体１と一体成形されたのち、
切除されたものである。FIG. 1 is a perspective view showing an example of a resin tubular body manufactured according to the present invention.
Is a connecting portion 2 extending in the illustrated X-axis direction, a central portion 3 which is bent from one connecting portion 2 at one bent portion 5a and extends in the illustrated Y-axis direction, and It is bent in the three-dimensional direction including the other connecting portion 4 which is bent at the bent portion 5b and extends in the illustrated Z-axis direction, and a hose or the like is provided on the outer peripheral surface near the end of each of the connecting portions 2 and 4. A pair of ridges 2a, 4a for connecting and fixing are provided. In FIG. 1, one unnecessary portion 6 and the other unnecessary portion 7 indicated by a dashed line are integrally formed with the resin tubular body 1.
It has been resected.
【００１０】次に本発明の一実施例を図１に示す樹脂製
管状体を製造する場合を例にあげて説明する。Next, an embodiment of the present invention will be described with reference to an example in which a resin tubular body shown in FIG. 1 is manufactured.
【００１１】図２は、本実施例の一工程を示し、型締め
された金型の合わせ面に対して垂直方向の断面図、図３
は図２のＡ−Ａ線からみた図であって、有底筒状体を形
成した状態を示す説明図である。FIG. 2 shows one step of this embodiment, and is a sectional view in a direction perpendicular to the mating surface of the clamped mold.
FIG. 3 is a diagram viewed from the line AA in FIG. 2, and is an explanatory diagram showing a state where a bottomed tubular body is formed.
【００１２】分割形式の金型は、一方の金型１０と他方
の金型１１からなり、三次元方向へ屈曲する樹脂製管状
体１およびその両端に一体成形された不要部６，７を規
制するためのキャビティ１４と、キャビティ１４の一端
へコア型１３を挿入するためのコア型挿入孔１５と、樹
脂製管状体１の前記屈曲部５ａ，５ｂに対応する合わせ
面屈曲部１２ａ，１２ｂを備えている。また、キャビテ
ィ１４の両端寄りにはそれぞれ一対ずつの前記突条２
ａ，４ａを形成するための溝１４ａ，１４ｂが設けられ
ている。The split mold comprises one mold 10 and the other mold 11 and regulates a resin tubular body 1 bent in three dimensions and unnecessary portions 6 and 7 integrally formed at both ends thereof. And a core mold insertion hole 15 for inserting the core mold 13 into one end of the cavity 14, and mating surface bent portions 12a and 12b corresponding to the bent portions 5a and 5b of the resin tubular body 1. Have. Further, a pair of the ridges 2 is provided near both ends of the cavity 14.
Grooves 14a and 14b for forming a and 4a are provided.
【００１３】先ず、図２に示すように、一方の金型１０
および他方の金型１１を型締めするとともに、コア型挿
入孔１５にコア型１３を挿入しその先端部をキャビティ
１４の一端へ突出させた状態で、射出ノズル１７を挿入
穴１８内へ挿入してゲート１６に射出ノズル１７のノズ
ル孔（図示せず）を連通させる。First, as shown in FIG.
While the other mold 11 is closed, the injection nozzle 17 is inserted into the insertion hole 18 in a state where the core die 13 is inserted into the core insertion hole 15, and the tip of the core die 13 is projected to one end of the cavity 14. The nozzle 16 (not shown) of the injection nozzle 17 communicates with the gate 16.
【００１４】ついで、コア型１３とキャビティ１４の間
の間隙部１９から、図３に示すように、射出ノズル１７
より所定量の溶融樹脂をキャビティ１４内へ射出注入し
てコア型１３の先端部を包み込むように、溶融樹脂から
なる有底筒状体２０を形成する。Next, as shown in FIG. 3, an injection nozzle 17 is provided through a gap 19 between the core mold 13 and the cavity 14.
A more predetermined amount of the molten resin is injected and injected into the cavity 14 to form the bottomed cylindrical body 20 made of the molten resin so as to surround the tip of the core mold 13.
【００１５】そののち、コア型１３の通路１３ａを通し
て窒素ガス等の加圧流体を有底筒状体２０中へ注入して
膨張させつつ、前記溶融樹脂の射出注入を継続して行う
ことで、有底筒状体２０の膨張に見合う溶融樹脂を補充
して、図４に示すようにキャビティ１４の内面全体に膨
張させて樹脂製管状体１およびその両端に一体成形され
た両不要部６，７からなる中空成形品２１を成形する。
ここで、一方の不要部６は、予め溶融樹脂からなる有底
筒状体を形成する目的があり、他方の不要部７は、余剰
樹脂を移動させて中空率を向上する目的がある。Thereafter, while the pressurized fluid such as nitrogen gas is injected into the bottomed cylindrical body 20 through the passage 13a of the core mold 13 to expand the same, the injection of the molten resin is continuously performed. The molten resin corresponding to the expansion of the bottomed cylindrical body 20 is replenished and expanded over the entire inner surface of the cavity 14 as shown in FIG. 7 is molded.
Here, one unnecessary portion 6 has a purpose of forming a bottomed tubular body made of a molten resin in advance, and the other unnecessary portion 7 has a purpose of moving a surplus resin to improve a hollow ratio.
【００１６】ついで、中空成形品２１を金型内で冷却し
たのち、型開きして取出し、一方の不要部６および他方
の不要部７をそれぞれ一方の切断部Ａおよび他方の切断
部Ｂにおいて切除して樹脂製管状体１を得る。なお、各
不要部の切除は中空成形品が金型中にある間に行うこと
ができる。Then, after the hollow molded article 21 is cooled in a mold, the mold is opened and taken out, and one unnecessary portion 6 and the other unnecessary portion 7 are cut off at one cut portion A and the other cut portion B, respectively. Thus, a resin tubular body 1 is obtained. In addition, cutting of each unnecessary portion can be performed while the hollow molded product is in the mold.
【００１７】ここで、本発明の方法の実施に使用する成
形装置の一例について説明する。Here, an example of a molding apparatus used for carrying out the method of the present invention will be described.
【００１８】図５に示すように、コア型１３の通路１３
ａは給排気管路３１の一端に接続されており、給排気管
路３１の他端は電磁弁２７を介して逆止弁３１を介在さ
せた給気管路３２の一端側および逆止弁３０を介在させ
た排気管路３３の一端側とに選択的に連通されるように
接続されている。また、排気管路３３の他端側は加圧流
体回収タンク２６に接続されている。As shown in FIG.
a is connected to one end of an air supply / exhaust line 31, and the other end of the air supply / exhaust line 31 is connected via a solenoid valve 27 to one end of an air supply line 32 with a check valve 31 interposed therebetween and a check valve 30. Are connected so as to be selectively communicated with one end side of the exhaust pipe 33 interposed therebetween. The other end of the exhaust pipe 33 is connected to the pressurized fluid recovery tank 26.
【００１９】給気管路３２の他端側は図示しない駆動源
により駆動されるピストン２４ａを有するアキュームレ
ータ２４の加圧室２４ｂに接続されているとともに、加
圧室２４ｂは、加圧室２４ｂ側から順次逆止弁２９、減
圧弁２８を介在させた管路３４によって加圧流体供給タ
ンク２５に接続されている。電磁弁２７、射出装置２２
およびアキュームレータ２４のピストン２４ａの図示し
ない駆動源は制御装置２３によってそれぞれ制御される
ように構成されている。The other end of the air supply line 32 is connected to a pressurizing chamber 24b of an accumulator 24 having a piston 24a driven by a driving source (not shown). It is connected to the pressurized fluid supply tank 25 by a pipe 34 interposed with a check valve 29 and a pressure reducing valve 28 in order. Solenoid valve 27, injection device 22
The drive source (not shown) of the piston 24 a of the accumulator 24 is configured to be controlled by the control device 23.
【００２０】次に、図５に示す成形装置の動作について
説明する。Next, the operation of the molding apparatus shown in FIG. 5 will be described.
【００２１】前述の如くコア型１３の先端部をキャビテ
ィ１４内へ突出させた状態で一方の金型１０および他方
の金型１１を型締めし、射出装置２２を前進させて射出
ノズル１７の先端をゲート１６の開口部に当接させる。With the tip of the core mold 13 protruding into the cavity 14 as described above, one mold 10 and the other mold 11 are clamped, and the injection device 22 is advanced to move the tip of the injection nozzle 17. Is brought into contact with the opening of the gate 16.
【００２２】ついで、射出ノズル１７より所定量の溶融
樹脂を前述の要領で射出注入して、コア型１３の先端部
を包み込むように溶融樹脂からなる有底筒状体２０を形
成する。Next, a predetermined amount of the molten resin is injected and injected from the injection nozzle 17 in the above-described manner to form a bottomed cylindrical body 20 made of the molten resin so as to surround the tip of the core mold 13.
【００２３】そののち、通路１３ａを通して加圧流体を
注入するが、この加圧流体の注入は次のように行われ
る。Thereafter, the pressurized fluid is injected through the passage 13a. The injection of the pressurized fluid is performed as follows.
【００２４】電磁弁２７を中立位置にして給気管路３２
および排気管路３３の一端をそれぞれ閉鎖しておく。そ
ののち、ピストン２４ａを後退させると、加圧流体供給
タンク２５の加圧流体は減圧弁２８によって５〜７気圧
程度に減圧されたのち、逆止弁２９を通り加圧室２４ｂ
内へ供給される。With the solenoid valve 27 in the neutral position, the air supply line 32
And one end of the exhaust pipe 33 are closed. Thereafter, when the piston 24a is retracted, the pressure of the pressurized fluid in the pressurized fluid supply tank 25 is reduced to about 5 to 7 atm by the pressure reducing valve 28, and then passes through the check valve 29 to the pressure chamber 24b.
Supplied inside.
【００２５】ついで、ピストン２４ａを前進させて圧縮
することにより、加圧室２４ｂ中の加圧流体の圧力を１
３０〜１６０気圧程度に昇圧したのち、電磁弁２７を切
換えて給気管路３２と給排気管路３１とを連通させる
と、通路１３ａを通して、昇圧された加圧流体が有底筒
状体２０内へ注入される。この昇圧された加圧流体の圧
力によって有底筒状体２０が膨張していくが、これと同
時にこの膨張に見合う量の溶融樹脂の射出注入を継続し
て行うことによって、キャビティ１４内へ溶融樹脂の補
充を行いながらキャビティ１４に沿って中空成形品２１
を成形する。Next, the pressure of the pressurized fluid in the pressurizing chamber 24b is reduced to 1 by advancing and compressing the piston 24a.
After the pressure is increased to about 30 to 160 atm, when the electromagnetic valve 27 is switched to connect the air supply line 32 and the supply / exhaust line 31, the pressurized pressurized fluid in the bottomed cylindrical body 20 passes through the passage 13 a. Injected into The bottomed tubular body 20 expands due to the pressure of the pressurized fluid that has been pressurized. At the same time, by continuously injecting and injecting an amount of molten resin corresponding to the expansion, the molten resin is melted into the cavity 14. While the resin is being replenished, the hollow molded article 21 is formed along the cavity 14.
Is molded.
【００２６】成形後、しばらく加圧流体の圧力を維持す
る保圧工程を行ったのち、電磁弁２７を切換えて給排気
管路３１を排気管路３３に連通させて、中空成形品２１
中の加圧流体を加圧流体回収タンク２６に回収すること
によって減圧する。After the molding, a pressure-holding step of maintaining the pressure of the pressurized fluid for a while is performed, and then the solenoid valve 27 is switched so that the supply / exhaust line 31 communicates with the exhaust line 33, and the hollow molded product 21 is formed.
The pressure is reduced by collecting the pressurized fluid in the pressurized fluid collection tank 26.
【００２７】減圧後、中空成形品２１をキャビティ１４
内で冷却したのち、型開きして取出し両端部の不要部
６，７をそれぞれ切断部Ａ，Ｂにおいて切除することで
樹脂製管状体１を得る。After the pressure reduction, the hollow molded article 21 is removed from the cavity 14.
After cooling in the inside, the mold is opened, and the unnecessary portions 6 and 7 at both ends of the take-out are cut off at the cut portions A and B, respectively, to obtain the resin tubular body 1.
【００２８】本発明により製造された樹脂製管状体は、
ポリエチレン、ポリプロピレン、ポリアミド、変性ポリ
フェニレンオキサイド、ポリブチレンテレフタレート、
その他ＥＰＤＭなどエラストマー的性質を有する熱可塑
性合成樹脂材料からなり、自動車分野、電気製品分野な
どでダクト、ホースまたはチューブとして使用される。
なお、前記熱可塑性合成樹脂材料は、公知の補強充填
剤、難然剤、顔料、発泡剤などを必要に応じて配合して
使用することができる。The resin tubular body produced according to the present invention comprises:
Polyethylene, polypropylene, polyamide, modified polyphenylene oxide, polybutylene terephthalate,
In addition, it is made of a thermoplastic synthetic resin material having an elastomeric property such as EPDM, and is used as a duct, a hose or a tube in the fields of automobiles and electric appliances.
In addition, the said thermoplastic synthetic resin material can mix | blend and use a well-known reinforcing filler, a refractory agent, a pigment, a foaming agent, etc. as needed.
【００２９】[0029]
【発明の効果】本発明は、上述のように構成されている
ので、次に記載するような効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００３０】溶融樹脂からなる有底筒状体がキャビティ
内で膨張する際に、前記膨張に見合う量の溶融樹脂の補
充が行われるため、従来例の如く有底筒状体の先端壁が
突き破られてピンホールが生じることもなく、キャビテ
ィ内面に沿って均一に膨張する。このため、両端部の不
要部を切除して得られる樹脂製管状体の内面の形状は滑
らかでしかも肉厚が均一なものとなり、また、長尺ある
いは三次元方向へ屈曲した樹脂製管状体であっても簡単
に製造することができる。When the bottomed cylindrical body made of the molten resin expands in the cavity, the molten resin is replenished in an amount corresponding to the expansion, so that the tip wall of the bottomed cylindrical body protrudes as in the conventional example. It is uniformly expanded along the inner surface of the cavity without being broken and generating a pinhole. For this reason, the shape of the inner surface of the resin-made tubular body obtained by cutting off unnecessary portions at both ends is smooth and uniform in thickness, and is a long or three-dimensionally bent resin-made tubular body. Even if there is, it can be easily manufactured.
【図１】本発明によって製造された樹脂製管状体の一例
を示す斜視図である。FIG. 1 is a perspective view showing an example of a resin tubular body manufactured according to the present invention.
【図２】本発明の一実施例の一工程を示し、型締めされ
た金型の合わせ面に対して垂直方向の断面図である。FIG. 2 is a cross-sectional view showing one process of one embodiment of the present invention, which is perpendicular to a mating surface of a mold that has been clamped.
【図３】図２のＡ−Ａ線からみた図であって、有底筒状
体を形成した状態を示す説明図である。FIG. 3 is a view seen from line AA of FIG. 2, and is an explanatory view showing a state where a bottomed cylindrical body is formed.
【図４】図３に示す工程の後、中空成形品の成形完了時
の状態を示す説明図である。FIG. 4 is an explanatory view showing a state at the time of completion of molding of a hollow molded article after the step shown in FIG. 3;
【図５】本発明の実施に用いる成形装置の一例を示す説
明図である。FIG. 5 is an explanatory view showing an example of a molding apparatus used for carrying out the present invention.
【図６】従来の管状体の製造方法の工程を示す主要部模
式断面図である。FIG. 6 is a schematic sectional view of a main part showing steps of a conventional method for manufacturing a tubular body.
１ 樹脂製管状体 ２ 一方の接続部 ３ 中央部 ４ 他方の接続部 ５ａ 一方の屈曲部 ５ｂ 他方の屈曲部 １０ 一方の金型 １１ 他方の金型 １２ 合わせ面 １２ａ，１２ｂ 合わせ面屈曲部 １３ コア型 １３ａ 通路 １４ キャビティ １５ コア型挿入孔 １６ ゲート １７ 射出ノズル １９ 間隙部 ２０ 有底筒状体 ２１ 中空成形品 DESCRIPTION OF SYMBOLS 1 Resin tubular body 2 One connection part 3 Central part 4 The other connection part 5a One bent part 5b The other bent part 10 One mold 11 The other mold 12 Fitting surface 12a, 12b Fitting surface bending part 13 Core Mold 13a Passage 14 Cavity 15 Core mold insertion hole 16 Gate 17 Injection nozzle 19 Gap part 20 Bottom cylindrical body 21 Hollow molded product
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 - 45/84 B29C 49/00 - 49/06 B29C 69/00 - 69/02 B29L 22:00 - 23:24 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B29C 45/00-45/84 B29C 49/00-49/06 B29C 69/00-69/02 B29L 22: 00-23:24
Claims (1)
に一体成形された不要部からなる中空成形品の外周面を
規制するキャビティを有する分割型式の金型を前記キャ
ビティの一端へコア型の先端部を突出させて型締めした
のち、前記コア型の先端部を包み込むように溶融樹脂を
前記キャビティ内へ射出注入して溶融樹脂からなる有底
筒状体を形成し、ついで前記コア型を介して加圧流体を
前記有底筒状体内へ注入して膨張させつつ前記溶融樹脂
の射出注入を継続して行うことで、前記有底筒状体の膨
張に見合う前記溶融樹脂を補充して前記キャビティに沿
って前記中空成形品を成形し、ついで金型中で冷却した
のち、前記不要部を切除することを特徴とする樹脂製管
状体の製造方法。1. A split mold having a cavity that regulates the outer peripheral surface of a hollow molded product composed of a portion to be a resin tubular body and unnecessary portions integrally molded at both ends thereof, a core mold is attached to one end of the cavity. After protruding the tip and clamping the mold, a molten resin is injected and injected into the cavity so as to wrap the tip of the core mold to form a bottomed cylindrical body made of the molten resin. By continuously performing the injection and injection of the molten resin while injecting and expanding the pressurized fluid into the bottomed cylindrical body through the replenishment of the molten resin corresponding to the expansion of the bottomed cylindrical body. A method of manufacturing a resin-made tubular body, comprising forming the hollow molded article along the cavity, cooling the molded article in a mold, and cutting off the unnecessary portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13541293A JP3241490B2 (en) | 1993-05-13 | 1993-05-13 | Method for producing resin tubular body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13541293A JP3241490B2 (en) | 1993-05-13 | 1993-05-13 | Method for producing resin tubular body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06320566A JPH06320566A (en) | 1994-11-22 |
| JP3241490B2 true JP3241490B2 (en) | 2001-12-25 |
Family
ID=15151128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13541293A Expired - Fee Related JP3241490B2 (en) | 1993-05-13 | 1993-05-13 | Method for producing resin tubular body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3241490B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2768960B1 (en) * | 1997-09-29 | 2001-07-13 | Polyplast | METHOD FOR MANUFACTURING A MONOBLOCK CONDUIT COMPRISING AN AXIAL CHANNEL AND CONDUIT THUS OBTAINED |
| DE102008023473A1 (en) * | 2008-05-14 | 2009-11-19 | Röchling Automotive AG & Co. KG | Calibrator for casting process with projectile injection (PIT) |
-
1993
- 1993-05-13 JP JP13541293A patent/JP3241490B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06320566A (en) | 1994-11-22 |
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