JP2004142246A - Method and mold for molding resin molded article - Google Patents

Method and mold for molding resin molded article Download PDF

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Publication number
JP2004142246A
JP2004142246A JP2002309698A JP2002309698A JP2004142246A JP 2004142246 A JP2004142246 A JP 2004142246A JP 2002309698 A JP2002309698 A JP 2002309698A JP 2002309698 A JP2002309698 A JP 2002309698A JP 2004142246 A JP2004142246 A JP 2004142246A
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Japan
Prior art keywords
mold
molding
cavity block
support
molded product
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JP2002309698A
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JP4033751B2 (en
Inventor
Takemi Yoshida
吉田 竹巳
Hiroshi Abe
阿部 洋
Teruaki Yamamoto
山本 輝昭
Katsuyuki Morita
盛田 勝幸
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Mitsui Chemicals Inc
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Mitsui Chemicals Inc
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Priority to JP2002309698A priority Critical patent/JP4033751B2/en
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    • 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
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/14598Coating tubular articles
    • 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
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/261Moulds having tubular mould cavities
    • B29C45/2614Moulds having tubular mould cavities for manufacturing bent tubular articles using an undercut forming mould core

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

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability, safety and stability of production when works for setting a sleeve of an insert part in a mold and taking out a joint after molding are performed by hands. <P>SOLUTION: In this method for molding the resin molded article, a supporting fitment 23 fitted on a base 24 is moved in the longitudinal direction of a receptacle 25, and a molding position A and a retreating position B are made switchable. Works for fitting the sleeve 28 on which an electric heating wire is wound in a coil-like shape and for removing the joint 32 after molding from the supporting fitment 23 are performed at the retreating position B, so that the works can be performed with better workability and safety than they are performed in a narrow space between a movable mold 2 and a fixed mold, under a bad foothold where there exist a tie bar and a guide bar 14 and 19, and under a high temperature environment where the work is suffered from thermal influence of the heated mold. At the molding position A, when the movable mold 2 is closed to join it to the fixed mold, the supporting fitment 23 is assembled into the movable mold 2 with the receptacle 25, and it can be pushed out from the mold 2 by a pushing bar 21. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明が属する技術分野】
本発明は、金属その他の材質よりなるインサート部品を金型にセットして成形する樹脂成形品の成形方法と、該方法で用いる金型に関する。
【0002】
【従来技術】
樹脂成形品の一つに樹脂管同志或いは樹脂管と金属管を接続するのに用いる電気融着継手がある。この継手は、樹脂管管端部が差し込まれる差込口に電熱線をコイル状に埋設し、電熱線への通電により電熱線を発熱させて、その周りの樹脂を溶融し、これにより樹脂管との融着を行うようになっており、その成形方法として、固定金型と開閉可能な可動金型よりなる金型を用い、電熱線をコイル状に巻き付けた熱可塑性樹脂又は金属製のスリーブを固定金型又は可動金型のキャビティにセットしたのち、可動金型を閉じて射出成形する方法が知られる。
【0003】
金属管と樹脂管を連結するための継手で、金属管を接続する金属製の接続金具をインサートした継手についても、その成形は接続金具を固定金型又は可動金型のキャビティにセットしたのち可動金型を閉じて射出成形することにより行われる。
【0004】
こうしたスリーブや接続金具(以下、こうしたスリーブや接続金具その他金型にインサートされる部品を単に「インサート部品」という)の金型へのセット、成形後の金型からの成形品である継手の取り出しは多くの場合、ロボットによって自動的に行われているが、人手によって行われることもある。
【0005】
【発明が解決しようとする課題】
上述する継手を例にとっていえば、インサート部品の金型へのセット、成形後の金型からの継手の取り出しは、可動金型を開いてから行われるが、この作業をロボットによって行う場合、作業エリアが狭いためにロボットの動作が制限される一方、人手によって行う場合、同じく作業エリアが狭いこと、金型が熱せられて金型付近の作業環境が高温となっていること、開いた可動金型と固定金型の間にはタイバーやガイドバーなどがあって、足元が悪く、両金型の間を行き来するときの障害となること等のため作業性が悪く、生産の安定性を欠くうえ、安全性についても問題があった。
【0006】
こうした問題は、上述の継手に限らず、一般のインサート成形品でもインサート部品を金型にセットしたり、成形後、成形品を金型から取り出す作業を人手によって行う場合において同様に生ずる。
本発明は、インサート部品を金型にセットしたり、成形後、成形品を金型から取り出す作業を人手によって行う場合において生ずる上記の問題を解消することができる樹脂成形品の成形方法と、該方法で用いる金型を提供することを目的とする。
【0007】
【課題の解決手段】
本発明の成形方法は、可動金型を開いた状態で、固定金型と、可動金型のうちのいずれか一方、若しくは相方の金型における下記(1)〜(3)のいずれかを成形を行う成形位置と、作業スペースが十分に取れる退避位置とに切換えできるようにし、インサート部品を金型にセットするとき、或いは金型から成形品を取り出すときには成形位置よりスライド或いは旋回して退避位置に切換えられることを特徴とする。
(1)固定金型及び若しくは可動金型の金型全体
(2)キャビティブロックのみ、又は該キャビティブロック及び該キャビティブロックと一体をなす部分
(3)キャビティブロックに着脱可能で、インサート部品及び若しくはインサート部品を組み込んだ成形品を支持する支持金具
【0008】
本発明によると、インサート部品を金型にセットするとき、或いは金型から成形品を取り出すときには、可動金型を開いたのち両金型のうち、いずれか一方又は相方の金型における上記(1)〜(3)のいずれかがスライド或いは旋回して退避位置に切換えられ、退避位置に切換わった状態では、上記(1)〜(3)の前面に作業スペースが十分に取れ、金型の熱的影響も受けにくゝなるため作業性が向上し、更に退避位置を障害物がない場所に設定すれば、作業性がより一層向上し、サイズや重量の大なるインサート部品や成形品でも金型のキャビティや支持金具への着脱が容易に行え、安全性も向上する。
【0009】
なお、本発明で用いるインサート部品は、成形品に組み込まれて一体化されて用いられるものであってもよいし、例えば継手における電熱線を巻き付けた金属製のスリーブ金具のように、成形後、成形品から取り出されるものであってもよい。
【0010】
本発明に係わる金型は、固定金型と開閉可能な可動金型よりなる金型において、下記(1)〜(3)のいずれかを成形を行う成形位置と、作業スペースが十分に取れる退避位置とにスライド或いは旋回して切換できるように構成したことを特徴とする。
(1)固定金型及び若しくは可動金型の金型全体
(2)キャビティブロックのみ、又は該キャビティブロック及び該キャビティブロックと一体をなす部分
(3)キャビティブロックに着脱可能で、インサート部品及び若しくはインサート部品を組み込んだ成形品を支持する支持金具
【0011】
好ましい発明においては、上記(1)〜(3)のなかで、サイズ及び重量の小さな支持金具が成形位置と退避位置に切換できるようにされる。
更に別の好ましい発明においては、上記(2)のキャビティブロック又は該ブロックと一体をなす部分か或いは上記(3)の支持金具を金型より押出す押出手段と、金型より押し出されたキャビティブロック又は該ブロックと一体をなす部分、或いは支持金具を支持して退避位置まで案内させる支持手段が設けられる。
【0012】
ここで押出手段としては、キャビティブロック又は該ブロックと一体をなす部分或いは支持金具(これらを以下、単に「支持金具等」という)を押し出す機能を有するものであればよく、特に限定されないが、敢えて例示すれば、油圧シリンダーや空気圧シリンダーが挙げられる。
【0013】
また支持手段としては、例えばレール、テーブル、受台等を例示することができ、支持金具等を移動手段に沿って移動させるときには、例えば油圧シリンダーや空気圧シリンダー、支持金具等に設けたラックと、該ラックと噛合し、モータにより回転駆動されるピニオンよりなるピニオンラック機構、両端を支持金具等に連結した無端チェーンと、該チェーンに噛合し、モータによって回転駆動されるスプロケットよりなるもの、支持金具等に連結したワイヤーやロープを巻き取ることにより支持金具等を牽引する巻取装置等、動力装置を用いることもできるし、人手によって押し動かすこともできる。人手によって押し動かす場合にはことに、移動がスムースに行えるように、支持金具等にはコロや車輪を取付け、支持手段を転動して移動できるようにするのが望ましい。
【0014】
なお、支持金具等を金型から押出す場合、支持金具等を押出手段により支持手段上に押し出すようにしてもよいし、支持金具等を支持手段上に支持したまゝ支持手段と共に押し出されるようにしてもよい。
金型を以上のような構造とすることにより、自動化を考えた場合、ロボット等の作業エリアが広くなり、動作、作業性が向上する。
【0015】
【発明の実施の形態】
以下、本発明の一実施形態であるエルボ継手の金型について説明する。
金型は図1に示すように、固定金型1と開閉可能な可動金型2よりなり、射出成形時においては閉じ、成形の前後においては図示するように開くことができるようになっている。
【0016】
上記固定金型1は、図示しない土台上に固定される取付板3と、該取付板3に固着されるキャビティプレート4と、キャビティプレート4の凹所内にキャビティプレート4と面一をなして嵌合し固定され、正面(図1においては左側面)から見て台形をなすキャビティブロック5とよりなっており、キャビティブロック5下には後述のベースと受台の一側が着脱可能に嵌合する凹溝6が形成されている。
【0017】
可動金型2は、図示しない上記土台上に移動可能に支持されている。そして固定金型1と連結されるタイバー(図示しない)に案内されて油圧シリンダーにより固定金型1に向かって進退し開閉するようになっており、固定金型1と同様、取付板8と、該取付板8に固定されるキャビティプレート9と、キャビティプレート9に取着されるキャビティブロック10を有し、図1に示すキャビティプレート9の左方には更にエジェクタープレート11と押出板12が配置されている。
【0018】
以下、これらについて詳述する。
キャビティプレート9は、固定側のキャビティプレート4の上下にそれぞれ一対ずつ突設されるガイドバー14が嵌挿する嵌挿孔15を上下において図1の前後(図2においては左右)にそれぞれ一対ずつ有し(図1には下側のみ図示している)、各嵌挿孔15に嵌挿されるガイドバー14に案内されて固定側のキャビティプレート4に向かって進退するようになっており、図2に示すように、正面にはスライドコア16と該スライドコア16を矢印の斜め方向に進退させる油圧シリンダーよりなる装置17を左右対称形に配置し、左右のスライドコア16は図示しない制御装置によって装置17を制御することにより同期して進退するようになっている。
【0019】
キャビティプレート9はまた、キャビティプレート4に向かって突出し、該キャビティプレート4に形成される嵌挿孔7に嵌挿されるガイドバー19と、キャビティブロック10を押し出す押出手段を有している。この押出手段は、図1及び図2に示されるように、キャビティブロック10の両側に取着される一対の油圧シリンダー20と、両油圧シリンダー20のピストンロッド21に連結される押出板12と、該押出板12の下側部両側に横向きに突設される押出棒21よりなっており、この押出棒21の機能については後述する。
【0020】
キャビティブロック10もキャビティブロック5と同様、キャビティプレート9の凹所内にキャビティプレート9と面一をなして固定され、その周りには図示していないが、台形枠状の支持金具23が嵌合する台形枠状の凹部が形成され、キャビティブロック10下には上記凹溝6に対向する凹溝24が該凹部に連通して形成されている。
【0021】
支持金具23はベース24上に固定され、ベース24は支持手段の受台25上に置かれ、受台25の長手方向に形成されるレール溝にベース24より突設される突条27が嵌合することによりベース24が支持金具23と共に受台25の長手方向にのみ移動できるようになっており、受台25は更にガイドバー19に通され、該ガイドバー19に沿って進退してベース24及び支持金具23と共にガイドブロック10の周りの凹部と、上記凹溝24に着脱可能に装着され、右側部の突出部分は、可動金型2を閉じて固定金型1に合体させたとき固定金型側の上記凹溝6に嵌合し装着される。
【0022】
こうして支持金具23はベース24及び受台25と共に、キャビティブロック10の周りの凹部や凹溝24に嵌合し、上述の押出棒21がベース24に側面から当たってベース24を突き出すことにより図1に示す位置にガイドバー19に案内されて押し出され、また油圧シリンダー20により押出板12が図1の左方に移動し、押出棒21が左方に後退したのち、可動金型2が図1の右方に移動して閉じ、各ガイドバー14及び19が各嵌挿孔7、15に嵌挿して固定金型1と合体するとき、ベース24と受台25の右側部が先ず固定金型側の凹溝6に嵌合し、ついで可動金型側のキャビティブロック10の周りの凹部や凹溝24に支持金具23と、ベース24及び受台25の右側部が嵌合するようになっている。
【0023】
支持金具23は左右の傾斜部にインサート部品である、金属製のスリーブ28が嵌合する半円形の凹部29を形成し、凹部29の周面にはスリーブ28のフランジ30が嵌合する周溝31(図3参照)を形成し、スリーブ28が着脱可能に取着されて保持されるようになっている。図中、33は凹部29に嵌合されるスリーブ28を支持する支持部である。
【0024】
図1に示すエジェクタープレート11は図示していないが、押出板12と同様、押出棒を有し、油圧シリンダーにより進退して押出棒でスリーブ28を僅かに押出してスリーブ28や成形品の継手32を支持金具23の凹部29より浮かし、取出しが容易に行えるようにしている。
【0025】
次に上記金型を用いたエルボ継手の成形方法について説明する。
図1に示すように、可動金型2を閉じて油圧シリンダー20により押出棒21を突き出し、支持金具23をベース24及び受台25と共に可動金型2より押出したのち、支持金具23とベース24を受台25の長手方向に押し動かし、可動金型2より引き離して図3の一点鎖線で示す退避位置に退避させる。
【0026】
退避位置において、電熱線をコイル状に巻き付けた一対のスリーブ28を支持金具23の各凹部29にフランジ30を周溝31に嵌合させてそれぞれ装着したのち、図3の実線で示す元の成形位置まで押し動かして戻す。そして図1の状態で油圧シリンダー20の作動により押出棒21を図1の一点鎖線位置に引込めたのち、可動金型2を閉じて固定金型1に合体させる(図4)。この状態で支持金具23は可動金型側のキャビティブロック10の周りの凹部に嵌合し、かつベース24と受台25が固定金型1と可動金型2の凹溝6及び24に嵌合する。そしてスリーブ28と支持部33が固定金型側のキャビティブロック5に形成される凹部(図示しない)に嵌合する。
【0027】
次に図2に示す油圧シリンダーよりなる装置17により左右のスライドコア16をそれぞれスリーブ28内に通して突出させ、突き合わせる。こうして図2に示すようにスリーブ28とスライドコア16の周りにキャビティ34を形成する。この状態で射出成形を行い、成形後、可動金型2を後退して開き、エジェクタープレート11の押出棒でスリーブ28を僅かに押出して成形品の継手32を支持金具23に若干の遊びを持たせた状態で支持させておく。ついで押出板12及び押出棒21を図1の実線位置に動かして支持金具23をベース24や受台25と共に押出す。その後、支持金具23をベース24と共に受台25の長手方向に図3の一点鎖線で示す退避位置まで押し動かし退避させる。そして継手32をスリーブ28と共に支持金具23より取出す。図3は継手32を取出した状態を示す。継手32を取り出したのちは支持金具23に電熱線を巻付けた新たなスリーブ28を装着し、上記動作を繰り返す。なお、継手32に組み込まれるスリーブ28は継手冷却後、継手32より抜き取られる。
【0028】
本方法によると、スリーブの取付け、成形後の継手の取り出しは、支持金具23を退避位置に退避させて行われ、退避位置は固定金型1や可動金型2から離れて両金型1及び2の熱的影響を受けることが少ないうえ、両金型1、2間のように足元にタイバー、ガイドバー14、19等がなく、支持金具23の前面に十分な作業スペースが確保できるため作業性及び安全性が向上し、これにより生産の安定性も向上する。また支持金具23を押し動かすだけでよいから労力の負担も少なくてすむ。
【0029】
以上は金属製のスリーブを用いたエルボ継手の成形方法について説明したが、樹脂製のスリーブを用いた場合でも、また他の継手、例えばソケット継手、チーズ継手、サドル継手についても、更には継手以外の他のインサート部品を組み込んだ成形品についても同様の方法で成形することができ、同様の効果を奏することができる。
【0030】
【発明の効果】
請求項1及び2に係わる発明によると、退避位置を足元に障害物がなく、インサート部品や成形品の着脱作業を行う作業スペースを十分にとることができる箇所に設定することが可能で、少なくとも退避位置では成形位置より金型がない分、作業スペースに余裕ができ、ロボット等による自動化を考えた場合、ロボット等の作業エリアが広くなり、動作作業性が向上する。また作業を人手によって行う場合でも金型の熱的影響を受けることも少ないため、作業性や安全性が向上し、生産の安定性も向上する。
【0031】
請求項3に係わる発明によると、支持金具のみを成形位置と退避位置との間で切り換えるようにしたことにより、切換えに要する動力或いは労力を最小限にすることができる。
請求項4に係わる発明によると、キャビティブロック又はそれと一体をなす部分或いは支持金具が押出手段により金型から押し出されたのち、支持手段に案内されて退避位置まで退避される。
【0032】
請求項5に係わる発明によると、押出手段は支持金具のみを押し出すから押出に要する動力を最小限にすることができ、請求項6に係わる発明においては、支持金具を支持手段と共に押し出すから支持金具を成形位置と退避位置との間で切り換える際、支持金具を一方向のみに移動できるように構成することが容易にできる。
【図面の簡単な説明】
【図1】可動金型を開いた状態を示す金型の部分断面側面図。
【図2】支持金具を取り付けた可動金型の正面図。
【図3】成形位置と退避位置に切換えられる可動金型の要部の正面図。
【図4】可動金型を固定金型に合体させたときの態様を示す図。
【符号の説明】
1・・固定金型
2・・可動金型
3、8・・取付板
4、9・・キャビティプレート
5、10・・キャビティブロック
6、24・・凹溝
7、15・・嵌挿孔
12・・押出板
14、19・・ガイドバー
16・・スライドコア
17・・油圧シリンダーよりなる装置
20・・油圧シリンダー
21・・押出棒
23・・支持金具
24・・ベース
25・・受台
27・・突条
28・・スリーブ
29・・凹部
30・・フランジ
31・・周溝
32・・継手
34・・キャビティ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for molding a resin molded product in which an insert part made of metal or other material is set in a mold and molded, and a mold used in the method.
[0002]
[Prior art]
As one of the resin molded products, there is an electric fusion joint used to connect the resin pipes or the resin pipe and the metal pipe. In this joint, a heating wire is buried in a coil shape at an insertion port into which an end of a resin tube is inserted, and the heating wire is heated by energizing the heating wire to melt the resin around the heating wire. And a mold made of a fixed mold and a movable mold that can be opened and closed, and a heating sleeve wound in a coil shape of a thermoplastic resin or a metal sleeve. Is set in a cavity of a fixed mold or a movable mold, and then the movable mold is closed to perform injection molding.
[0003]
For a joint that connects a metal tube and a resin tube and that has a metal connection fitting for connecting the metal tube inserted, the molding is performed after setting the connection fitting in the cavity of the fixed mold or movable mold. This is performed by closing the mold and performing injection molding.
[0004]
Setting such a sleeve or connection fitting (hereinafter, such a sleeve or connection fitting or other part inserted into a mold simply as an “insert part”) in a mold, and taking out a joint as a molded product from the mold after molding. Is often done automatically by robots, but can also be done manually.
[0005]
[Problems to be solved by the invention]
Taking the above-mentioned joint as an example, setting the insert part in the mold and taking out the joint from the mold after molding are performed after opening the movable mold. While the movement of the robot is limited due to the small area, when performing manually, the work area is also small, the mold is heated and the working environment near the mold is high, and the open movable mold There is a tie bar or guide bar between the mold and the fixed mold, and the feet are poor, which may be an obstacle when moving between the two dies, resulting in poor workability and lack of production stability. In addition, there was a problem regarding safety.
[0006]
Such a problem is not limited to the above-described joints, but also occurs in a case where an insert part is set in a mold or a work of taking out the molded article from the mold after molding is performed by a general insert molded article.
The present invention provides a method for molding a resin molded product, which can solve the above-mentioned problem that occurs when an operation of setting an insert part in a mold or taking out the molded product from the mold after molding is performed manually. An object is to provide a mold used in the method.
[0007]
[Means for solving the problem]
In the molding method of the present invention, one of the fixed mold and the movable mold or one of the following (1) to (3) in the other mold is molded with the movable mold opened. And the retracted position where the working space can be sufficiently taken out. When the insert part is set in the mold or when the molded product is taken out from the mold, the retracted position is slid or swiveled from the molding position. It is characterized by being switched to.
(1) The whole mold of the fixed mold and / or the movable mold (2) Only the cavity block, or a part integral with the cavity block (3) The insert part and / or insert which can be attached to and detached from the cavity block Supporting bracket for supporting a molded product incorporating parts
According to the present invention, when the insert part is set in the mold or when the molded article is taken out from the mold, the movable mold is opened, and then the above (1) in one or both molds is opened. In the state where any one of (3) to (3) slides or turns and is switched to the retracted position, and in the state switched to the retracted position, a sufficient working space is provided on the front surface of the above (1) to (3), and Workability is improved because it is hardly affected by thermal effects.Furthermore, if the retreat position is set to a place where there are no obstacles, workability is further improved, and even insert parts and molded products with large size and weight can be improved. The mold can be easily attached to and detached from the cavity and the support bracket, and safety is improved.
[0009]
Incidentally, the insert part used in the present invention may be used by being incorporated into a molded article and integrated, for example, after molding, such as a metal sleeve fitting around a heating wire in a joint, It may be removed from a molded article.
[0010]
The mold according to the present invention is a mold composed of a fixed mold and a movable mold that can be opened and closed, and a retracting position at which any of the following (1) to (3) is molded, and a retractable work space. It is characterized in that it can be switched by sliding or turning to the position.
(1) The whole mold of the fixed mold and / or the movable mold (2) Only the cavity block, or a part integral with the cavity block (3) The insert part and / or insert which can be attached to and detached from the cavity block Supporting bracket for supporting a molded product incorporating parts
In a preferred aspect of the present invention, among the above items (1) to (3), a small-size and heavy-weight support fitting can be switched between a molding position and a retracted position.
In still another preferred invention, an extrusion means for extruding the cavity block of (2) or a part integral with the block or the support fitting of (3) from a mold, and a cavity block extruded from the mold. Alternatively, a part integral with the block or a support means for supporting the support fitting and guiding it to the retracted position is provided.
[0012]
Here, the extrusion means is not particularly limited as long as it has a function of extruding the cavity block, a part integral with the block, or a support bracket (hereinafter simply referred to as “support bracket or the like”). Examples include hydraulic cylinders and pneumatic cylinders.
[0013]
Further, as the support means, for example, rails, tables, pedestals and the like can be exemplified, when moving the support brackets and the like along the moving means, for example, a hydraulic cylinder and a pneumatic cylinder, a rack provided on the support bracket and the like, A pinion rack mechanism comprising a pinion which meshes with the rack and is driven to rotate by a motor; an endless chain having both ends connected to a support fitting; and a sprocket which meshes with the chain and is driven to rotate by a motor; A power device such as a winding device that pulls a supporting bracket or the like by winding a wire or a rope connected to the device or the like can be used, or can be manually pushed and moved. In particular, when pushing and moving by hand, it is desirable that a roller or a wheel be attached to a support fitting or the like so that the support means can be rolled and moved so that the movement can be performed smoothly.
[0014]
In the case where the support fitting or the like is extruded from the mold, the support fitting or the like may be extruded onto the support means by the extrusion means, or the support fitting or the like may be extruded together with the support means while being supported on the support means. It may be.
By considering the mold as described above, when automation is considered, the work area of the robot or the like is widened, and the operation and workability are improved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a mold for an elbow joint according to an embodiment of the present invention will be described.
As shown in FIG. 1, the mold comprises a fixed mold 1 and a movable mold 2 which can be opened and closed. The mold can be closed at the time of injection molding, and can be opened before and after molding as shown. .
[0016]
The fixed mold 1 is fitted on a mounting plate 3 fixed on a base (not shown), a cavity plate 4 fixed to the mounting plate 3, and flush with the cavity plate 4 in a recess of the cavity plate 4. The cavity block 5 has a trapezoidal shape as viewed from the front (the left side in FIG. 1), and a base and one side of a receiving base, which will be described later, are detachably fitted under the cavity block 5. A concave groove 6 is formed.
[0017]
The movable mold 2 is movably supported on the base (not shown). Then, it is guided by a tie bar (not shown) connected to the fixed mold 1, and advances and retreats toward the fixed mold 1 by a hydraulic cylinder to open and close. It has a cavity plate 9 fixed to the mounting plate 8, and a cavity block 10 attached to the cavity plate 9, and an ejector plate 11 and an extruding plate 12 are further disposed on the left side of the cavity plate 9 shown in FIG. Have been.
[0018]
Hereinafter, these will be described in detail.
The cavity plate 9 has a pair of insertion holes 15 in which guide bars 14 projecting from the upper and lower sides of the fixed-side cavity plate 4 are respectively inserted into the front and rear of FIG. 1 (left and right in FIG. 2). 1 (only the lower side is shown in FIG. 1), and is guided by a guide bar 14 inserted into each insertion hole 15 to advance and retreat toward the fixed-side cavity plate 4. As shown in FIG. 2, on the front side, a device 17 composed of a slide core 16 and a hydraulic cylinder for moving the slide core 16 forward and backward in the diagonal direction of the arrow is symmetrically arranged, and the left and right slide cores 16 are controlled by a control device (not shown). By controlling the device 17, it advances and retreats synchronously.
[0019]
The cavity plate 9 also has a guide bar 19 that protrudes toward the cavity plate 4 and is inserted into the insertion hole 7 formed in the cavity plate 4, and a pushing unit that pushes out the cavity block 10. As shown in FIGS. 1 and 2, the pushing means includes a pair of hydraulic cylinders 20 attached to both sides of the cavity block 10, an extruding plate 12 connected to piston rods 21 of both hydraulic cylinders 20, The extruding plate 12 includes an extruding rod 21 protruding laterally on both sides of a lower portion thereof. The function of the extruding rod 21 will be described later.
[0020]
Similarly to the cavity block 5, the cavity block 10 is fixed in the recess of the cavity plate 9 so as to be flush with the cavity plate 9, and a trapezoidal frame-shaped support fitting 23 is fitted around the cavity block 10, though not shown. A concave portion having a trapezoidal frame shape is formed, and a concave groove 24 facing the concave groove 6 is formed below the cavity block 10 so as to communicate with the concave portion.
[0021]
The support bracket 23 is fixed on a base 24, and the base 24 is placed on a support 25 of the support means, and a ridge 27 projecting from the base 24 is fitted into a rail groove formed in the longitudinal direction of the support 25. The base 24 can move only in the longitudinal direction of the pedestal 25 together with the support fitting 23 by the engagement, and the pedestal 25 is further passed through the guide bar 19, and advances and retreats along the guide bar 19 to move the base 24. The recess around the guide block 10 together with the support 24 and the support fitting 23 are detachably mounted in the recessed groove 24, and the protruding portion on the right side is fixed when the movable mold 2 is closed and integrated with the fixed mold 1. It is fitted and mounted in the concave groove 6 on the mold side.
[0022]
In this manner, the support fitting 23 is fitted into the concave portion or the concave groove 24 around the cavity block 10 together with the base 24 and the receiving stand 25, and the pushing rod 21 hits the base 24 from the side and projects the base 24 as shown in FIG. 1 is pushed out by being guided by the guide bar 19, the extruding plate 12 is moved leftward in FIG. 1 by the hydraulic cylinder 20, and the extruding rod 21 is retreated leftward. When the guide bars 14 and 19 are inserted into the respective insertion holes 7 and 15 to be combined with the fixed mold 1, the right sides of the base 24 and the receiving table 25 are first fixed to the fixed mold. The support fitting 23 and the right sides of the base 24 and the pedestal 25 are fitted into concave portions and concave grooves 24 around the cavity block 10 on the movable mold side. I have.
[0023]
The support fitting 23 forms a semicircular concave portion 29 in which a metal sleeve 28 as an insert part is fitted in the left and right inclined portions, and a circumferential groove in which a flange 30 of the sleeve 28 is fitted on the peripheral surface of the concave portion 29. 31 (see FIG. 3), and the sleeve 28 is detachably attached and held. In the drawing, reference numeral 33 denotes a support portion for supporting the sleeve 28 fitted into the concave portion 29.
[0024]
Although not shown, the ejector plate 11 shown in FIG. 1 has an extruding rod like the extruding plate 12, and is advanced and retracted by a hydraulic cylinder to slightly extrude the sleeve 28 with the extruding rod so that the sleeve 28 and the joint 32 of the molded product are formed. Is lifted from the concave portion 29 of the support fitting 23 so that it can be easily taken out.
[0025]
Next, a method of forming an elbow joint using the above-described mold will be described.
As shown in FIG. 1, the movable mold 2 is closed, the push rod 21 is pushed out by the hydraulic cylinder 20, and the support metal 23 is extruded from the movable mold 2 together with the base 24 and the receiving stand 25. Is pushed in the longitudinal direction of the pedestal 25, separated from the movable mold 2, and retracted to the retracted position shown by the dashed line in FIG.
[0026]
At the retracted position, a pair of sleeves 28 around which a heating wire is wound in a coil shape are fitted to the respective recesses 29 of the support fitting 23 by fitting the flanges 30 to the peripheral grooves 31 and then to the original molding shown by solid lines in FIG. Push back to position and return. Then, after the push rod 21 is retracted to the position indicated by the dashed line in FIG. 1 by the operation of the hydraulic cylinder 20 in the state shown in FIG. 1, the movable mold 2 is closed and united with the fixed mold 1 (FIG. 4). In this state, the support fitting 23 is fitted into the concave portion around the cavity block 10 on the movable mold side, and the base 24 and the pedestal 25 are fitted into the concave grooves 6 and 24 of the fixed mold 1 and the movable mold 2. I do. Then, the sleeve 28 and the support portion 33 are fitted into a concave portion (not shown) formed in the cavity block 5 on the fixed mold side.
[0027]
Next, the right and left slide cores 16 are respectively protruded into the sleeves 28 by the device 17 including a hydraulic cylinder shown in FIG. Thus, a cavity 34 is formed around the sleeve 28 and the slide core 16 as shown in FIG. In this state, injection molding is performed. After molding, the movable mold 2 is retracted and opened, and the sleeve 28 is slightly pushed out by the push rod of the ejector plate 11 so that the joint 32 of the molded product has some play in the support fitting 23. It is supported in a state where it is laid. Next, the extruding plate 12 and the extruding rod 21 are moved to the position indicated by the solid line in FIG. Thereafter, the support metal 23 is pushed and moved together with the base 24 in the longitudinal direction of the pedestal 25 to a retracted position shown by a dashed line in FIG. Then, the joint 32 is taken out from the support fitting 23 together with the sleeve 28. FIG. 3 shows a state in which the joint 32 has been removed. After taking out the joint 32, a new sleeve 28 around which a heating wire is wound is attached to the support fitting 23, and the above operation is repeated. The sleeve 28 incorporated in the joint 32 is extracted from the joint 32 after cooling the joint.
[0028]
According to this method, the attachment of the sleeve and the removal of the joint after molding are performed by retracting the support fitting 23 to the retracted position, and the retracted position is separated from the fixed mold 1 and the movable mold 2 and the two molds 1 and 2 are separated from each other. 2 is hardly affected by heat, and there are no tie bars, guide bars 14, 19, etc. at the feet as between the two dies 1, 2, and a sufficient working space can be secured on the front surface of the support fitting 23. The safety and the safety are improved, and the stability of the production is also improved. Further, since it is only necessary to push and move the support fitting 23, the burden of labor can be reduced.
[0029]
The above describes the method of forming an elbow joint using a metal sleeve.However, even when a resin sleeve is used, other joints such as a socket joint, a cheese joint, a saddle joint, and even a joint other than the joint are used. A molded product incorporating another insert part can be molded in the same manner, and the same effect can be obtained.
[0030]
【The invention's effect】
According to the first and second aspects of the present invention, the retracted position can be set at a position where there is no obstacle at the foot and a sufficient working space for attaching and detaching the insert part and the molded product can be obtained. At the retreat position, since there is no mold than the molding position, a work space can be provided, and when automation by a robot or the like is considered, the work area of the robot or the like is widened, and the operability is improved. Further, even when the work is performed manually, there is little thermal influence of the mold, so that workability and safety are improved, and production stability is also improved.
[0031]
According to the third aspect of the present invention, since only the support fitting is switched between the molding position and the retracted position, the power or labor required for switching can be minimized.
According to the fourth aspect of the present invention, the cavity block, a part integral with the cavity block, or the supporting metal is pushed out of the mold by the pushing means, and then guided by the supporting means and retracted to the retracted position.
[0032]
According to the fifth aspect of the present invention, since the pushing means pushes out only the support fitting, the power required for extrusion can be minimized. In the invention according to the sixth aspect, the support fitting is pushed out together with the support means, so that the support fitting is pushed out. When switching between the molding position and the retracted position, it is easy to configure so that the support fitting can be moved in only one direction.
[Brief description of the drawings]
FIG. 1 is a partial sectional side view of a mold showing a state where a movable mold is opened.
FIG. 2 is a front view of a movable mold to which a support fitting is attached.
FIG. 3 is a front view of a main part of a movable mold that can be switched between a molding position and a retracted position.
FIG. 4 is a diagram showing an aspect when a movable mold is combined with a fixed mold.
[Explanation of symbols]
1. Fixed mold 2. Movable mold 3, 8, Mounting plate 4, 9, Cavity plate 5, 10, Cavity block 6, 24, Groove groove 7, 15, Fitting hole 12, · Extrusion plates 14 and 19 ··· Guide bar 16 ··· Slide core 17 ··· Device consisting of hydraulic cylinder 20 ··· Hydraulic cylinder 21 ··· Extrusion rod 23 ··· Support bracket 24 ··· Base 25 ··· Stand 27. Ridge 28 sleeve 29 recess 30 flange 31 circumferential groove 32 joint 34 cavity

Claims (6)

可動金型を開いた状態で、固定金型と、可動金型のうちのいずれか一方、若しくは相方の金型における下記(1)〜(3)のいずれかを成形を行う成形位置と、作業スペースが十分に取れる退避位置とに切換えできるようにし、インサート部品を金型にセットするとき、或いは金型から成形品を取り出すときには成形位置よりスライド或いは旋回して退避位置に切換えられることを特徴とする樹脂成形品の成形方法。
(1)固定金型及び若しくは可動金型の金型全体
(2)キャビティブロックのみ、又は該キャビティブロック及び該キャビティブロックと一体をなす部分
(3)キャビティブロックに着脱可能で、インサート部品及び若しくはインサート部品を組み込んだ成形品を支持する支持金具
In the state where the movable mold is opened, a molding position for molding one of the fixed mold and the movable mold, or one of the following molds (1) to (3), and a work When the insert part is set in the mold or when the molded product is taken out from the mold, it can be switched to the retracted position by sliding or turning from the molding position when the insert part can be switched to the retracted position where sufficient space can be taken. Molding method for molded resin products.
(1) The whole mold of the fixed mold and / or the movable mold (2) Only the cavity block, or the cavity block and a part integral with the cavity block (3) Insertable parts and / or inserts that are detachable from the cavity block Support bracket for supporting molded products incorporating components
固定金型と開閉可能な可動金型よりなる樹脂成形品用の金型において、下記(1)〜(3)のいずれかを成形を行う成形位置と、作業スペースが十分に取れる退避位置とにスライド或いは旋回して切換できるように構成したことを特徴とする樹脂成形品用の金型。
(1)固定金型及び若しくは可動金型の金型全体
(2)キャビティブロックのみ、又は該キャビティブロック及び該キャビティブロックと一体をなす部分
(3)キャビティブロックに着脱可能で、インサート部品及び若しくはインサート部品を組み込んだ成形品を支持する支持金具
In a mold for a resin molded product composed of a fixed mold and a movable mold that can be opened and closed, a molding position for molding any of the following (1) to (3) and a retreat position where a sufficient working space can be obtained. A mold for a resin molded product, characterized in that it can be switched by sliding or turning.
(1) The whole mold of the fixed mold and / or the movable mold (2) Only the cavity block, or the cavity block and a part integral with the cavity block (3) Insertable parts and / or inserts that are detachable from the cavity block Support bracket for supporting molded products incorporating components
支持金具が成形位置と退避位置に切換可能である請求項2記載の樹脂成形品用の金型。The mold for a resin molded product according to claim 2, wherein the support fitting is switchable between a molding position and a retracted position. 上記(2)のキャビティブロック又は該ブロックと一体をなす部分か或いは(3)の支持金具を金型より押出す押出手段と、金型より押し出されたキャビティブロック又は該ブロックと一体をなす部分、或いは支持金具を支持して退避位置まで案内させる支持手段が設けられる請求項2又は3記載の樹脂成形品用の金型。An extruding means for extruding the cavity block of (2) or a part integral with the block or the supporting bracket of (3) from a mold, and a cavity block extruded from the mold or a part integral with the block; 4. A mold for a resin molded product according to claim 2, wherein a support means for supporting the support fitting and guiding it to the retracted position is provided. 押出手段が支持金具を金型から支持手段上に押し出す請求項4記載の樹脂成形品用の金型。The mold for a resin molded product according to claim 4, wherein the pushing means pushes the support fitting from the mold onto the support means. 支持金具は支持手段上に支持されて押出手段により支持手段と共に金型から押し出される請求項4記載の樹脂成形品用の金型。The mold for a resin molded product according to claim 4, wherein the support fitting is supported on the support means and is extruded from the mold together with the support means by an extrusion means.
JP2002309698A 2002-10-24 2002-10-24 Molding method and mold for resin molded products Expired - Fee Related JP4033751B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216158A1 (en) * 2009-02-05 2010-08-11 Etervind AB Core assembly for an injection moulding-machine
CN104890192A (en) * 2015-04-30 2015-09-09 陈伟娅 Quarter bend joint thread demolding mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216158A1 (en) * 2009-02-05 2010-08-11 Etervind AB Core assembly for an injection moulding-machine
WO2010089362A1 (en) * 2009-02-05 2010-08-12 Etervind Ab Core assembly for an injection moulding-machine
US8585955B2 (en) 2009-02-05 2013-11-19 Etervind Ab Core assembly for an injection moulding-machine
CN104890192A (en) * 2015-04-30 2015-09-09 陈伟娅 Quarter bend joint thread demolding mechanism

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