JPH05154896A - Production of cylindrical body - Google Patents
Production of cylindrical bodyInfo
- Publication number
- JPH05154896A JPH05154896A JP32448291A JP32448291A JPH05154896A JP H05154896 A JPH05154896 A JP H05154896A JP 32448291 A JP32448291 A JP 32448291A JP 32448291 A JP32448291 A JP 32448291A JP H05154896 A JPH05154896 A JP H05154896A
- Authority
- JP
- Japan
- Prior art keywords
- parison
- blow molding
- molding machine
- injection molding
- cylindrical body
- 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.)
- Pending
Links
Landscapes
- 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、例えばパイプ等の筒状
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 manufacturing a tubular body such as a pipe.
【０００２】[0002]
【発明の背景】パイプ等の筒状体の製造方法として、従
来では、ダイレクトブロー法、押し出し成形法あるいは
特公昭５８−１４２９３号公報で示される如くのインジ
ェクションブロー成形法が実施されている。しかしなが
ら、ダイレクトブロー法では、寸法精度が出ない、
表面が美しくない、後加工が必要、肉厚が均一にな
らない、内径寸法が出ない、用いることが出来る樹
脂はポリエチレン等の僅かなものに限られており、メル
トフローレートが高い樹脂には適用できないと言った問
題点が有り、又、押し出し成形法では、簡単な形状の
ものしか製造出来ない、すなわち多少でも表面に凹凸と
か屈曲が有るものは製造出来ない、寸法精度が出ない
と言った問題点が有り、又、インジェクションブロー成
形法は、金型の構造が複雑で、高いものに付く、成形
出来る製品の形状に制限が有る、成形終了までに要す
る１サイクルの時間が長い、一度に成形出来る製品数
に制約が有り、コストが高いものに付くと言った問題点
が有り、改善が待たれている。BACKGROUND OF THE INVENTION As a method for manufacturing a tubular body such as a pipe, a direct blow method, an extrusion molding method, or an injection blow molding method as shown in Japanese Patent Publication No. 58-14293 is conventionally used. However, in the direct blow method, dimensional accuracy does not appear,
The surface is not beautiful, post processing is required, the wall thickness is not uniform, the inner diameter does not appear, and the resin that can be used is limited to a few such as polyethylene, and it is applicable to resins with high melt flow rate There is a problem that it can not be done, and it is said that the extrusion molding method can only manufacture simple shapes, that is, it is not possible to manufacture things with unevenness or bending on the surface even if it is a little, dimensional accuracy can not be obtained There are problems, and the injection blow molding method has a complicated structure of the mold, it has a high cost, there is a limit to the shape of the product that can be molded, the time of one cycle required to complete the molding is long, There is a limit to the number of products that can be molded, and there is a problem that it comes with high costs, so improvement is awaited.
【０００３】[0003]
【発明の開示】本発明の目的は、寸法精度が高く、か
つ、内径にムラが少なく、成形型の構成も簡単で、製造
コストが低廉であり、さらには種々の形状の筒状体が得
られるようになる技術を提供することである。この本発
明の目的は、射出成形手段により軸芯方向に貫通孔を有
するパリソンを成形するパリソン成形工程と、パリソン
成形工程で得られたパリソンを目的形状を有する中空成
形工程に移行し、空気を供給して中間周壁部を膨出させ
る膨出工程とを具備することを特徴とする筒状体の製造
方法によって達成される。DISCLOSURE OF THE INVENTION It is an object of the present invention to have high dimensional accuracy, little variation in inner diameter, simple mold construction, low manufacturing cost, and various tubular bodies. It is to provide the technology that will be realized. The object of the present invention is to transfer the parison obtained by the parison molding step of molding the parison having the through hole in the axial direction by the injection molding means and the parison obtained in the parison molding step to the hollow molding step having the target shape, and to remove air And a bulging step of bulging the intermediate peripheral wall portion to provide a bulging step.
【０００４】又、射出成形手段により軸芯方向に貫通孔
を有するパリソンを成形するパリソン成形工程と、パリ
ソン成形工程で得られたパリソンを延伸手段を備えた目
的形状を有する中空成形工程に移行し、中間周壁部を延
伸する延伸工程と、空気を供給して中間周壁部を膨出さ
せる膨出工程とを具備することを特徴とする筒状体の製
造方法によって達成される。Further, the parison molding process for molding the parison having the through hole in the axial direction by the injection molding means and the hollow molding process for forming the parison obtained in the parison molding process having the target shape with the stretching means are performed. This is achieved by a method for producing a tubular body, comprising: a stretching step of stretching the intermediate peripheral wall portion and a swelling step of supplying air to swell the intermediate peripheral wall portion.
【０００５】すなわち、本発明にあっては、射出成形手
段が用いられてなるから、両端部が確実に構成され、従
って筒状体の接続が行われるような場合にも極めて好都
合なものとなる。そして、一つのパリソンから中空成形
機次第で各種の筒状体が得られることになり、多品種の
製造に適用出来るようになる。つまり、多品種少量生産
に適用出来るのである。さらには、パリソンと最終製品
が別工程で作られるから、生産調整も容易に行える。
又、生産性も高い。かつ、金型の構造は簡単なもので済
む。そして、得られた筒状体は内径にムラが少ないもの
である。尚、中空成形工程で用いられる中空成形機はパ
リソン成形工程で用いられるものであっても、そうでな
く別の機械であっても良い。That is, according to the present invention, since the injection molding means is used, both ends are surely constructed, and therefore, it is extremely convenient even when the cylindrical bodies are connected. . Then, various tubular bodies can be obtained from one parison depending on the blow molding machine, and can be applied to the production of various kinds. In other words, it can be applied to high-mix low-volume production. Furthermore, since the parison and the final product are manufactured in separate processes, production adjustment can be easily performed.
It also has high productivity. Moreover, the structure of the mold is simple. Then, the obtained tubular body has little unevenness in the inner diameter. The blow molding machine used in the blow molding step may be that used in the parison molding step, or may be another machine.
【０００６】以下、本発明の具体的な実施例を述べる。Specific examples of the present invention will be described below.
【０００７】[0007]
〔実施例１〕図１〜図４は本発明に係る筒状体の製造方
法の第１実施例を示すもので、図１はパリソン成形段階
の説明図、図２は得られたパリソンの断面図、図３はパ
リソンをブロー成形機に装着した段階の説明図、図４は
最終製品の断面図である。[Embodiment 1] FIGS. 1 to 4 show a first embodiment of a method for producing a tubular body according to the present invention. FIG. 1 is an explanatory view of a parison forming step, and FIG. 2 is a cross section of the obtained parison. FIG. 3 is an explanatory view of a stage where the parison is mounted on the blow molding machine, and FIG. 4 is a sectional view of the final product.
【０００８】各図中、１は射出成形機の金型、２はコア
ピンであり、金型１内に熱可塑性樹脂が射出成形され、
これによって図２に示す如くのパリソン３が得られる。
このパリソン３の孔４における内形は、コアピン２が抜
きピンであることから、テーパー状に形成されざるを得
ないものである。すなわち、中央部側の内径ａが端側の
内径ｂより短いものとならざるを得ないのである。In each drawing, 1 is a mold of an injection molding machine, 2 is a core pin, and a thermoplastic resin is injection-molded in the mold 1.
As a result, the parison 3 as shown in FIG. 2 is obtained.
The inner shape of the hole 4 of the parison 3 is inevitably formed in a tapered shape because the core pin 2 is a removal pin. That is, the inner diameter a on the center side is inevitably shorter than the inner diameter b on the end side.
【０００９】次に、上記射出成形手段で構成されたパリ
ソン３を射出成形機から取り出し、図３に示す如く、別
のブロー成形機５に装着し、加熱する。そして、孔４内
側に空気を供給すると、パリソン３の中央部側の内壁部
６がブロー成形金型のキャビティ７の分だけ膨出し、図
４に示される如くの筒状体８が得られる。上記のような
筒状体の製造方法は、先ず射出成形が行われた後に別の
ブロー成形機５によりブロー成形が行われるものである
から、得られた筒状体８は、その両端部分８ａ，８ｂの
寸法精度が高いものであり、しかも得られた筒状体８の
内径寸法に場所による差が少ないものである。Next, the parison 3 constituted by the injection molding means is taken out from the injection molding machine, mounted on another blow molding machine 5 as shown in FIG. 3, and heated. Then, when air is supplied to the inside of the hole 4, the inner wall portion 6 on the central portion side of the parison 3 expands by the amount corresponding to the cavity 7 of the blow molding die, and the cylindrical body 8 as shown in FIG. 4 is obtained. In the method for manufacturing the tubular body as described above, the injection molding is first performed, and then the blow molding is performed by another blow molding machine 5. Therefore, the obtained tubular body 8 has both end portions 8a. , 8b have high dimensional accuracy, and there is little difference in the inner diameter of the obtained tubular body 8 depending on the location.
【００１０】そして、一つのパリソンからブロー成形機
次第で各種の筒状体が得られることになり、多品種の製
造に適用出来るようになる。例えば、図２に示す如くの
一種類のパリソン３から図５〜図７に示すような種々の
形状の筒状体８Ａ，８Ｂ，８Ｃが得られる。又、パリソ
ン３と最終製品である筒状体８，８Ａ，８Ｂ，８Ｃが別
工程で作られるから、生産調整も容易に行える。又、生
産性も高い。かつ、金型の構造は簡単なもので済む。Various cylinders can be obtained from one parison depending on the blow molding machine, and can be applied to the production of various kinds. For example, from one type of parison 3 as shown in FIG. 2, tubular bodies 8A, 8B, 8C having various shapes as shown in FIGS. 5 to 7 can be obtained. Further, since the parison 3 and the final product cylindrical bodies 8, 8A, 8B, 8C are manufactured in separate steps, production adjustment can be easily performed. It also has high productivity. Moreover, the structure of the mold is simple.
【００１１】尚、本実施例においては、図示していない
が、筒状体８，８Ａ，８Ｂ，８Ｃの端部外面にはネジ溝
が形成されており、このような製品の場合にあっても簡
単、かつ、高精度にして得られる。 〔実施例２〕図８〜図１３は本発明に係る筒状体の製造
方法の第２実施例を示すもので、図８はパリソン成形段
階の説明図、図９は得られたパリソンの断面図、図１０
はパリソンをブロー成形機に装着した段階の説明図、図
１１は延伸段階の説明図、図１２はブロー段階の説明
図、図１３は最終製品の断面図である。In the present embodiment, although not shown, a thread groove is formed on the outer surface of the end of the cylindrical body 8, 8A, 8B, 8C. Is also easy and highly accurate. [Embodiment 2] FIGS. 8 to 13 show a second embodiment of the method for producing a tubular body according to the present invention. FIG. 8 is an explanatory view of a parison forming step, and FIG. 9 is a cross section of the obtained parison. Figure, Figure 10
Is an explanatory view of a stage in which a parison is mounted on a blow molding machine, FIG. 11 is an explanatory view of a stretching step, FIG. 12 is an explanatory view of a blowing step, and FIG. 13 is a sectional view of a final product.
【００１２】各図中、１１は射出成形機の金型、１２は
コアピンであり、金型１１内に熱可塑性樹脂が射出成形
され、これによって図９に示す如くのパリソン１３が得
られる。このパリソン１３の孔１４における内形は、コ
アピン１２が抜きピンであることから、テーパー状に形
成されざるを得ないものである。すなわち、中央部側の
内径ａが端側の内径ｂより短いものとならざるを得ない
のである。In each drawing, 11 is a die of an injection molding machine, 12 is a core pin, and a thermoplastic resin is injection-molded in the die 11 to obtain a parison 13 as shown in FIG. The inner shape of the hole 14 of the parison 13 is inevitably formed in a tapered shape because the core pin 12 is a removal pin. That is, the inner diameter a on the center side is inevitably shorter than the inner diameter b on the end side.
【００１３】次に、上記射出成形手段で構成されたパリ
ソン１３を射出成形機から取り出し、図１０に示す如
く、延伸ブロー成形機１５に装着し、加熱する。そし
て、図１１に示す如く、ブロー型１５ａ，１５ｂを各々
左右方向に引張し、パリソン１３を延伸する。この後、
図１２に示す如く、ブロー型１５ｃ，１５ｄを配置し、
この段階で孔１４内側に空気を供給すると、パリソン１
３の中央部側の内壁部１６がブロー成形金型のキャビテ
ィ１７の分だけ膨出し、図１３に示される如くの筒状体
１８が得られる。Next, the parison 13 constituted by the above injection molding means is taken out from the injection molding machine, mounted on the stretch blow molding machine 15 and heated as shown in FIG. Then, as shown in FIG. 11, the blow molds 15a and 15b are respectively pulled in the left-right direction to stretch the parison 13. After this,
As shown in FIG. 12, blow molds 15c and 15d are arranged,
If air is supplied to the inside of the hole 14 at this stage, the parison 1
The inner wall portion 16 on the central portion side of 3 bulges by the amount of the cavity 17 of the blow molding die, and a tubular body 18 as shown in FIG. 13 is obtained.
【００１４】本実施例においても、先ず射出成形が行わ
れた後に別のブロー成形機によりブロー成形が行われる
ものであるから、得られた筒状体１８は、その両端部分
１８ａ，１８ｂの寸法精度が高いものであり、しかも得
られた筒状体１８の内径寸法に場所による差が少ないも
のである。そして、一つのパリソンからブロー成形機次
第で各種の筒状体が得られることになり、多品種の製造
に適用出来るようになる。又、パリソン１３と最終製品
である筒状体１８が別工程で作られるから、生産調整も
容易に行える。又、生産性も高い。かつ、金型の構造は
簡単なもので済む。Also in this embodiment, since the injection molding is first performed and then the blow molding is performed by another blow molding machine, the dimensions of both end portions 18a and 18b of the obtained tubular body 18 are determined. The accuracy is high, and the difference in the inner diameter of the obtained tubular body 18 from place to place is small. Then, various cylinders can be obtained from one parison depending on the blow molding machine, and can be applied to the production of various kinds. Further, since the parison 13 and the tubular body 18 as the final product are manufactured in separate steps, production adjustment can be easily performed. It also has high productivity. Moreover, the structure of the mold is simple.
【００１５】[0015]
【効果】本発明によれば、先ず射出成形が行われた後に
別のブロー成形機によりブロー成形が行われるものであ
るから、得られた筒状体の両端部分の寸法精度が高いも
のであり、しかも得られた筒状体の内径寸法に場所によ
る差が少ないものである。According to the present invention, since the injection molding is first performed and then the blow molding is performed by another blow molding machine, the dimensional accuracy of both end portions of the obtained tubular body is high. Moreover, there is little difference in the inner diameter of the obtained tubular body depending on the location.
【００１６】そして、一つのパリソンから中空成形機次
第で各種の筒状体が得られることになり、多品種の製造
に適用出来るようになる。又、パリソンと最終製品であ
る筒状体が別工程で作られるから、生産調整も容易に行
える。又、生産性も高い。かつ、金型の構造は簡単なも
ので済む。Various tubular bodies can be obtained from one parison depending on the blow molding machine, and can be applied to the production of various kinds. Also, since the parison and the final product, the tubular body, are manufactured in separate steps, production adjustment can be easily performed. It also has high productivity. Moreover, the structure of the mold is simple.
【図１】パリソン成形段階の説明図である。FIG. 1 is an explanatory diagram of a parison molding stage.
【図２】パリソンの断面図である。FIG. 2 is a sectional view of a parison.
【図３】パリソンをブロー成形機に装着した段階の説明
図である。FIG. 3 is an explanatory diagram of a stage in which the parison is mounted on the blow molding machine.
【図４】最終製品（筒状体）の断面図である。FIG. 4 is a cross-sectional view of the final product (cylindrical body).
【図５】最終製品（筒状体）の断面図である。FIG. 5 is a cross-sectional view of the final product (cylindrical body).
【図６】最終製品（筒状体）の断面図である。FIG. 6 is a cross-sectional view of the final product (cylindrical body).
【図７】最終製品（筒状体）の断面図である。FIG. 7 is a cross-sectional view of the final product (cylindrical body).
【図８】パリソン成形段階の説明図である。FIG. 8 is an explanatory diagram of a parison molding step.
【図９】パリソンの断面図である。FIG. 9 is a sectional view of a parison.
【図１０】パリソンをブロー成形機に装着した段階の説
明図である。FIG. 10 is an explanatory diagram of a stage in which the parison is mounted on the blow molding machine.
【図１１】パリソン延伸段階の説明図である。FIG. 11 is an explanatory diagram of a parison stretching step.
【図１２】ブロー段階の説明図である。FIG. 12 is an explanatory diagram of a blowing stage.
【図１３】最終製品（筒状体）の断面図である。FIG. 13 is a cross-sectional view of the final product (cylindrical body).
１，１１ 射出成形機の金型 ３，１３ パリソン ５，１５ ブロー成形機 ８，８Ａ，８Ｂ，８Ｃ，１８ 筒状体 1,11 Mold of injection molding machine 3,13 Parison 5,15 Blow molding machine 8,8A, 8B, 8C, 18 Cylindrical body
Claims (2)
有するパリソンを成形するパリソン成形工程と、パリソ
ン成形工程で得られたパリソンを目的形状を有する中空
成形工程に移行し、空気を供給して中間周壁部を膨出さ
せる膨出工程とを具備することを特徴とする筒状体の製
造方法。1. A parison molding step of molding a parison having a through hole in an axial direction by injection molding means, and a parison obtained in the parison molding step is transferred to a hollow molding step having a target shape, and air is supplied. And a bulging step of bulging the intermediate peripheral wall portion.
有するパリソンを成形するパリソン成形工程と、パリソ
ン成形工程で得られたパリソンを延伸手段を備えた目的
形状を有する中空成形工程に移行し、中間周壁部を延伸
する延伸工程と、空気を供給して中間周壁部を膨出させ
る膨出工程とを具備することを特徴とする筒状体の製造
方法。2. A parison molding step of molding a parison having a through hole in the axial direction by injection molding means, and a parison obtained in the parison molding step are transferred to a hollow molding step having a target shape equipped with a stretching means. A method for manufacturing a tubular body, comprising: a stretching step of stretching the intermediate peripheral wall portion; and a swelling step of supplying air to swell the intermediate peripheral wall portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32448291A JPH05154896A (en) | 1991-12-09 | 1991-12-09 | Production of cylindrical body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32448291A JPH05154896A (en) | 1991-12-09 | 1991-12-09 | Production of cylindrical body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05154896A true JPH05154896A (en) | 1993-06-22 |
Family
ID=18166298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32448291A Pending JPH05154896A (en) | 1991-12-09 | 1991-12-09 | Production of cylindrical body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05154896A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008002126A1 (en) | 2007-06-01 | 2008-12-04 | Denso Corp., Kariya-shi | Method for producing a sewer pipe |
| JP2009208403A (en) * | 2008-03-05 | 2009-09-17 | Frontier:Kk | Manufacturing process of tubular component made of resin |
| CN112848246A (en) * | 2021-01-25 | 2021-05-28 | 宜宾天亿新材料科技有限公司 | Forming die and forming method for biaxial orientation plastic pipe |
-
1991
- 1991-12-09 JP JP32448291A patent/JPH05154896A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008002126A1 (en) | 2007-06-01 | 2008-12-04 | Denso Corp., Kariya-shi | Method for producing a sewer pipe |
| JP2009208403A (en) * | 2008-03-05 | 2009-09-17 | Frontier:Kk | Manufacturing process of tubular component made of resin |
| CN112848246A (en) * | 2021-01-25 | 2021-05-28 | 宜宾天亿新材料科技有限公司 | Forming die and forming method for biaxial orientation plastic pipe |
| CN112848246B (en) * | 2021-01-25 | 2023-02-03 | 宜宾天亿新材料科技有限公司 | Forming method of biaxial orientation plastic pipe |
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