JPS62161520A - Process for molding hollow member - Google Patents

Process for molding hollow member

Info

Publication number
JPS62161520A
JPS62161520A JP351486A JP351486A JPS62161520A JP S62161520 A JPS62161520 A JP S62161520A JP 351486 A JP351486 A JP 351486A JP 351486 A JP351486 A JP 351486A JP S62161520 A JPS62161520 A JP S62161520A
Authority
JP
Japan
Prior art keywords
parison
pipe
cavity
mold
tube
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
Application number
JP351486A
Other languages
Japanese (ja)
Other versions
JPH0467496B2 (en
Inventor
Takumi Yamashita
巧 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyoraku Co Ltd
Original Assignee
Kyoraku Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kyoraku Co Ltd filed Critical Kyoraku Co Ltd
Priority to JP351486A priority Critical patent/JPS62161520A/en
Publication of JPS62161520A publication Critical patent/JPS62161520A/en
Publication of JPH0467496B2 publication Critical patent/JPH0467496B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/48Moulds
    • B29C49/482Moulds with means for moulding parts of the parisons in an auxiliary cavity, e.g. moulding a handle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04Extrusion blow-moulding

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain a molding process of providing leakless pipes and unnecessary of secondary processing as formed integrally at the molding time, by setting up the cavity of the pipe at a position that is in a parting surface and rectangular to the setting direction of a parison, and by supporting under interposing the parison at the base of the cavity of the pipe on the time of mold closing. CONSTITUTION:A parison sags into the space of divided molds 11, 11, and an inserting mold 12 set up on the center line of a parison 22 is retained at a position corresponding to mold retaining portion 14. The divided molds 11, 11 are closed and the end 22' of the parison 22 is abutted against the inserting mold 12, then covers the surface of the divided molds side of the pipe cavity concaved portion 15. When pressurized fluid is flowed into the parison 22 and blow molding is executed, the end 22' of the parison 22 is adhered under swelling out to the pipe cavity concaved portion. After the divided molds 11, 11 are opened and the moldings is released from the molds, flashes 17 are separated from pinch-off portion 16 and the outer end of the pipe is cut off. By this molding process, it is possible to finish the outer and inner surface of the pipe very smooth, and therefore to prevent completely the leakage of a liquid when the pipe is connected.

Description

【発明の詳細な説明】 産業上の利用分野 広〈産業用として供されるプラスチック製のタンクの製
造方法に関し、特に一部に管体を有するタンクの製造方
法に関する。
DETAILED DESCRIPTION OF THE INVENTION Wide range of industrial applications <Regarding a method of manufacturing a plastic tank used for industrial use, in particular, a method of manufacturing a tank partially having a pipe body.

従来技術 外部からパイプなどを接続して、その内部に流体を入れ
たりあるいは内部から外部へ出したりするための管体を
有するタンクは、パイプと管体との接続部分での流体の
洩れをなくするために、様々な提案がされている(例へ
ば、特開昭54−43269号公報、特開昭53−66
962号公報、特開昭60−13521号公報など)。
Prior Art A tank that has a pipe body to which a pipe or the like is connected from the outside and allows fluid to enter or exit from the inside is designed to prevent fluid leakage at the connection between the pipe and the pipe body. Various proposals have been made in order to
962, JP-A-60-13521, etc.).

発明が解決しようとする問題点 特開昭54−43269号公報は、管体の寸法は精密に
仕上げることができ上記洩れを防止することはできるが
プロー成形後、タンク壁の切削及び管体の溶着という二
次加工が必要で作業が煩雑であった。特開昭53−66
962号公報は、管体の切削加工が必要であるばかりで
なく、切削作業時に切削抵抗力のために管体が基部(つ
け根部分)で折れるという欠点があった。
Problems to be Solved by the Invention Japanese Patent Application Laid-Open No. 54-43269 discloses that although the dimensions of the tube body can be precisely finished and the above-mentioned leakage can be prevented, after blow molding, cutting of the tank wall and cutting of the tube body are necessary. The work was complicated because it required a secondary process called welding. Japanese Unexamined Patent Publication 1983-1966
Publication No. 962 not only requires cutting of the tubular body, but also has the disadvantage that the tubular body breaks at the base (root portion) due to cutting resistance during cutting work.

また特開昭60−13521号公報は、管体の寸法は精
密に仕上げることができるが、穿孔しなければならずさ
らにその際の切りこがタンク内に入りその清掃工程が必
要という欠点を有していた。
Furthermore, although the dimensions of the pipe body can be precisely finished according to Japanese Patent Application Laid-open No. 60-13521, it has the disadvantage that holes must be drilled and the resulting cut ends up entering the tank, requiring a cleaning process. Was.

そこで本願発明は、このような種々の問題点に鑑み、上
記洩れの発生することのない管体を得るとともにこれら
を成形時に一体に形成して二次加工の必要のない成形方
法を提供することを目的とするものである。
Therefore, in view of these various problems, the present invention provides a molding method that provides a pipe body that does not cause the above-mentioned leakage, and also forms these pipes integrally during molding, thereby eliminating the need for secondary processing. The purpose is to

問題点を解決するための手段 本願発明は、その目的を達成するための技術的手段を次
のように構成した。すなわち、互いの対向する内面に管
体を有する中空体の形状を賦型したキャビティを有する
分割金型の間にパリスンを配置するとともに分割金型を
締めてパリスン内部に圧力流体を導入して中空体をブロ
ー成形する方法において管体のキャビティをパーティン
グ面でかつパリスンの配置方向と直交する位置に配置す
るとともに分割金型の型締め時にパリスンを管体のキャ
ビティの基部にて挟持することを特徴とするものである
Means for Solving the Problems The present invention has the following technical means for achieving the object. That is, a parison is placed between split molds each having a cavity formed into the shape of a hollow body with a tube on the opposing inner surfaces, and the split molds are tightened to introduce pressure fluid into the inside of the parison to create a hollow body. In the method of blow molding a body, the cavity of the tube is arranged on the parting surface and at a position perpendicular to the arrangement direction of the parison, and the parison is held at the base of the cavity of the tube when the split mold is clamped. This is a characteristic feature.

作用 上記の如く構成された本願発明の成形方法は、パリスン
を管体のキャビティの基部にて挟持するので、管体の外
方にあってはピンチオフ部を有しないので管体の内面及
び外面に凹陥部、変形等を発生させることなく表面を平
滑に仕上げることができ、さらに管体と中空体とのつけ
根部分である基部は中空体に比べて管体が肉薄になるこ
とがないので強度を有し外部からの力により折れること
がない。
Operation The molding method of the present invention configured as described above pinches the parison at the base of the cavity of the tube, so there is no pinch-off part on the outside of the tube, so there is no pinch-off on the inner and outer surfaces of the tube. The surface can be finished smooth without causing any recesses or deformation, and the base, which is the joint between the tube and the hollow body, is not thinner than a hollow body, so the strength is increased. It does not break due to external force.

実施例 本願発明の実施例を図面に基づいて説明する。Example Embodiments of the present invention will be described based on the drawings.

第1図は、本願発明により得られたタンク1の全体斜視
図である。2は管体でタンク1内部と外部とが連通しタ
ンクlと一体に形成されている。
FIG. 1 is an overall perspective view of a tank 1 obtained by the present invention. Reference numeral 2 denotes a pipe body that communicates between the inside and outside of the tank 1 and is formed integrally with the tank 1.

3は注入口で、4はブロー成形時のパーティングライン
である。このパーティングライン4は、管体2の基部B
を通過して中央部Aにて消失しており、管体2の内部及
び外部には凹状部を有していない。
3 is an injection port, and 4 is a parting line during blow molding. This parting line 4 is located at the base B of the tube body 2.
It passes through and disappears at the central part A, and there is no concave part inside or outside the tube body 2.

第2図は、本願発明の実施に供する金型の全体斜視図で
ある。図中11は分割金型で一面には内方へ凹設された
キャビティ13を有する。キャビティ13は、胴部キャ
ビティ13a、口部キャビティ13b、管体キャビティ
13cより構成される。12は、挿入金型で分割金型1
1とは別体に形成され、その分割金型11例の面には管
体2に対応した管体キャビティ凹部15が凹設されてい
る。尚、分割金型11の挿入金型12側の面には挿入金
型12の外周面の形状に対応した金型保持部14を備え
ている。
FIG. 2 is an overall perspective view of a mold used for implementing the present invention. In the figure, reference numeral 11 denotes a split mold, and one side thereof has a cavity 13 recessed inward. The cavity 13 includes a body cavity 13a, a mouth cavity 13b, and a tube cavity 13c. 12 is an insertion mold and split mold 1
A tubular body cavity recess 15 corresponding to the tubular body 2 is formed in the surface of the split mold 11. A mold holding portion 14 corresponding to the shape of the outer peripheral surface of the insertion mold 12 is provided on the surface of the split mold 11 on the insertion mold 12 side.

次に本願発明の製造方法を工程順に説明する。Next, the manufacturing method of the present invention will be explained step by step.

先ず分割金型11.11間にパリスン22を押出頭21
より押出して垂下させる。このときのパリスン22の直
径を、Dとする(第3図参照)。
First, the parison 22 is extruded between the split molds 11 and 11.
Push it out more and let it hang down. The diameter of the parison 22 at this time is assumed to be D (see FIG. 3).

次にパリスン22の中心線上に配置された挿入金型12
を直進させて金型保持部14に対応する位置に保持する
(第4図参照)。
Next, the insertion mold 12 is placed on the center line of the parison 22.
is moved straight and held at a position corresponding to the mold holding part 14 (see FIG. 4).

そして、分割金型11.11を締めることによりパリス
ン22の端部22′を挿入金型12に当接させ、管体キ
ャビティ凹部15の分割金型側の面を覆う(第5図参照
、第6図参照)。このとき分割金型により挾まれたパリ
スン22の巾Wは、一般にπD W = −(1) から設定される。
Then, by tightening the split mold 11.11, the end 22' of the parison 22 is brought into contact with the insertion mold 12, and the surface of the tube cavity recess 15 on the split mold side is covered (see FIG. 5, (See Figure 6). At this time, the width W of the parison 22 held between the split molds is generally set from πD W =−(1).

さらに、バリスフ22内に圧力流体を吹込むことにより
ブロー成形する(第7図参照)。このとき上記パリスン
端部22′は管体キャビティ凹部に膨出密着する。なお
、図中16はピンチオフ部分である。
Furthermore, blow molding is performed by blowing pressure fluid into the burr sleeve 22 (see FIG. 7). At this time, the parison end 22' bulges into the concave portion of the tube cavity. Note that 16 in the figure is a pinch-off portion.

分割金型11.11を開いて、成形品を離型後、バリ1
7をピンチオフ部分16より分離して管体2の外方端を
切除して本願発明の製造方法を終了する。
Open the split mold 11.11, release the molded product, and remove the burr 1.
7 is separated from the pinch-off portion 16 and the outer end of the tube body 2 is cut off, thereby completing the manufacturing method of the present invention.

この成形方法によれば、管体キャビティ凹部15が挿入
金型12に形成されているので管体のこの部分にピンチ
オフ部が形成されないばかりでなくパーティングライン
も表われないので管体の内外の表面をきわめて平滑に仕
上ることができ、パイプを接続したときに液洩れを完全
に防止できるのである。なお、第1図中人はパーティン
グライン4の管体における終点である。この終点Aは、
少なくとも管体の基部Bより外方にあることが必要であ
り、かつパイプを接続する部分より内方にあることが必
要である。
According to this molding method, since the tubular body cavity recess 15 is formed in the insertion mold 12, not only no pinch-off part is formed in this part of the tubular body, but also a parting line does not appear. The surface can be finished extremely smooth, completely preventing liquid leakage when connecting pipes. Note that the center line in FIG. 1 is the end point of the parting line 4 on the pipe body. This end point A is
It is necessary that it is located at least outwardly from the base B of the tube body, and it is necessary that it be located inwardly from the part where the pipe is connected.

ところで、本発明の中空体の管体は、基部の直径をD′
とし、その長さをLとすると、直径に対する長さの比(
L/D’)は、2〜10のものである。
By the way, the hollow tube of the present invention has a base diameter of D'.
and its length is L, then the ratio of length to diameter (
L/D') is from 2 to 10.

なお、上記実施例ではパリスン挟着の巾Wは、挿入金型
12の管体キャビティ凹部15の分割金型側の面を覆う
ように(1)式により設定したが、本発明の実施例に当
っては、この手段のほか上式で得られた直径りよりも小
さい径であっても真空吸着などの手段により分割金型の
型締前に管体キャビティ凹部側のパリスンを移動させる
ことにより分割金型側の面を覆うようにしてもよい。
In the above embodiment, the width W of the parison clamping was set according to formula (1) so as to cover the surface of the tube cavity recess 15 of the insertion mold 12 on the split mold side. In addition to this method, even if the diameter is smaller than the diameter obtained by the above formula, by moving the parison on the concave side of the tube cavity before clamping the split mold by means such as vacuum suction. The surface on the split mold side may be covered.

発明の効果 以上のように構成したので、本願発明により得られたタ
ンクの管体のパイプ接続部分の内部及び外部にパリスン
のピンチオフに起因する凹陥部分あるいは突起を発生さ
せることがないのでパイプを管体との接続部分から液洩
れがすることがないタンクが得られ、かつ成形後に二次
加工するとこなく管体が容易に製造できるのである。
Effects of the Invention With the structure as described above, there will be no recesses or protrusions caused by pinch-off of the parison on the inside and outside of the pipe connecting portion of the tank body obtained according to the present invention, so that the pipe can be connected easily. It is possible to obtain a tank that does not leak liquid from the connection part with the body, and the tube body can be easily manufactured without performing any secondary processing after molding.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本願発明の一実施例を示すもので、第1図は本願
発明の製造方法により得られたタンクの全体斜視図、第
2図は本願発明の実施に供する金型の斜視図、第3図か
ら第5図は製造工程を説明する正面図、第6図は型締時
の一部拡大断面図、第7図はブロ一時の一部拡大断面図
である。 1・・・タンク    2・・・管体 11.11  ・・・分割金型 12・・・挿入金型1
3・・・キャビティ  14・・・金型保持部15・・
・管体キャビティ凹部
The drawings show one embodiment of the present invention, and FIG. 1 is an overall perspective view of a tank obtained by the manufacturing method of the present invention, FIG. 2 is a perspective view of a mold used for carrying out the present invention, and FIG. 5 is a front view for explaining the manufacturing process, FIG. 6 is a partially enlarged sectional view during mold clamping, and FIG. 7 is a partially enlarged sectional view during blowing. 1...Tank 2...Pipe body 11.11...Divided mold 12...Insertion mold 1
3... Cavity 14... Mold holding part 15...
・Pipe body cavity recess

Claims (1)

【特許請求の範囲】[Claims] 互いの対向する内面に管体を有する中空体の形状を賦型
したキャビティを有する分割金型の間にパリスンを配置
するとともに分割金型を締めてパリスン内部に圧力流体
を導入して中空体をブロー成形する方法において、管体
のキャビティをパーティング面でかつパリスンの配置方
向と直交する位置に配置するとともに分割金型の型締め
時にパリスンを管体のキャビティの基部にて挟持するこ
とを特徴とする中空体の成形方法。
A parison is placed between split molds having a cavity shaped into the shape of a hollow body having a tubular body on the opposing inner surfaces, and the split molds are tightened to introduce pressure fluid into the parison to form the hollow body. The blow molding method is characterized by arranging the cavity of the tube at a position perpendicular to the direction of arrangement of the parison on the parting surface, and holding the parison at the base of the cavity of the tube when the split mold is clamped. A method for forming a hollow body.
JP351486A 1986-01-13 1986-01-13 Process for molding hollow member Granted JPS62161520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP351486A JPS62161520A (en) 1986-01-13 1986-01-13 Process for molding hollow member

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP351486A JPS62161520A (en) 1986-01-13 1986-01-13 Process for molding hollow member

Publications (2)

Publication Number Publication Date
JPS62161520A true JPS62161520A (en) 1987-07-17
JPH0467496B2 JPH0467496B2 (en) 1992-10-28

Family

ID=11559468

Family Applications (1)

Application Number Title Priority Date Filing Date
JP351486A Granted JPS62161520A (en) 1986-01-13 1986-01-13 Process for molding hollow member

Country Status (1)

Country Link
JP (1) JPS62161520A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62108026A (en) * 1985-11-06 1987-05-19 Ishikawajima Harima Heavy Ind Co Ltd Holing process for plastic tank

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62108026A (en) * 1985-11-06 1987-05-19 Ishikawajima Harima Heavy Ind Co Ltd Holing process for plastic tank

Also Published As

Publication number Publication date
JPH0467496B2 (en) 1992-10-28

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