JP2004351666A

JP2004351666A - Multicolor or composite injection molding machine

Info

Publication number: JP2004351666A
Application number: JP2003149457A
Authority: JP
Inventors: Hiroyuki Handa; 裕幸半田
Original assignee: Nissei Plastic Industrial Co Ltd
Current assignee: Nissei Plastic Industrial Co Ltd
Priority date: 2003-05-27
Filing date: 2003-05-27
Publication date: 2004-12-16
Anticipated expiration: 2023-05-27
Also published as: JP3865393B2

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the ejection of a core mold while keeping the curing time in the molding of a thermosetting resin by preceding the mold opening of a fixed mold and an intermediate plate by preventing the bending of a movable platen when the injection pressure due to two injection devices is received by one mold clamping cylinder and pressing and supporting the intermediate plate by a pressure pin. <P>SOLUTION: In this injection molding machine constituted by arranging a fixed mold for primary molding and a fixed mold for secondary molding side by side at the asymmetric position of a fixed platen, the intermediate plate for rotationally transferring a primary molded product to the fixed mold for secondary molding is attached to the rotary shaft inserted in the center part of the movable platen in a freely rotating, advancing and retreating state between the fixed platen and the movable platen connected to the mold clamping ram of the mold clamping cylinder and provided so as to freely advance and retreat with respect to the fixed platen. In this molding machine, two injection devices are parallelly provided at every fixed mold in a nozzle touch relation and two cylinders are provided so as to be individually and opposedly arranged on the same axial line as the injection devices and a support device due to a cylinder and a pin for pressing the intermediate plate to the fixed molds at the time of mold opening is provided in the movable platen on the axial line of the cylinders. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、固定盤と可動盤との間に設けた中間板の回転により、射出成形した一次成形品を二次成形側に移送して、一次成形品に異色又は異材質の樹脂を二次成形する多色又は複合成形品の射出成形機に関するものである。
【０００２】
【従来の技術】
周知の多色又は複合射出成形機は、金型ごとに樹脂の射出を行う２基の射出装置を備え、両射出装置による射出力を１基の型締シリンダにより受ける構造からなり、一次成形品の二次成形側への回転移送を、コア型を取付けた可動盤側の回転盤により行っている。
また一次成形品の二次成形側への移送を、固定盤と可動盤側の移動金型との間に設けた回転移送台により行う際に、回転軸と共に押し出しピンを前進して回転移送台を移動金型本体から離すと同時に、突出ピンの抜き出しを行っているものもある（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開平３−２６４３１８号公報（第３−４頁、図１−３）。
【０００４】
【発明が解決しようとする課題】
周知の２基の射出装置に対して１基の型締シリンダを配した構造では、型締シリンダの位置が可動盤の中央となるのに対し、射出力は可動盤の両側に集中することから、金型を取付けた両端部の型締力が不十分となりやすく、射出力が増大すると可動盤が撓んで、場合によってはパーティングラインにずれが生ずる。この撓みは可動盤の厚さを増すことによって解決されるが、厚みの増加は型締装置の大型化となり、また可動盤の重量増加ともなって、型開閉速度に影響を与える等の課題を有する。
【０００５】
また引用文献１では、押し出しピンを回転移送台に当接しているが、その押し出しピンは、固定金型本体から移動金型本体を離す際に、回転移送台を前方に押し出して、その後の回転移送台の回転移送に、成形品の突き出ピンと押えピンが障害とならないように、回転移送台から抜き出すものであるから、その押し出しピンの利用をもって回転移送台と移動金型本体の型開を先に行うことはできない課題を有する。
【０００６】
この発明の目的は、１基の型締シリンダにより２基の射出装置による射出圧を受ける場合の可動盤の撓みを解決するとともに、可動金型と中間板の型開を先行して、抜きテーパーの角度が小さなコア型の抜出しが容易に行え、また熱硬化性樹脂の成形における硬化時間の維持にも適用可能な新たな多色又は複合射出成形機を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的によるこの発明は、固定盤の対称位置に一次成形用の固定型と二次成形用の固定型を並設し、その固定盤と、型締シリンダの型締ラムと連結して固定盤に対し進退自在に設けた可動盤との間に、一次成形品を二次成形用の固定型に回転移送する中間板を、可動盤の中心部に回転かつ進退自在に挿通した回転軸に取付けて設け、２基の射出装置を上記固定型ごとに並行にノズルタッチして設けた多色又は複合射出成形機において、上記型締シリンダを２基として、各型締シリンダを上記射出装置と同一軸線上に個々に正対配置し、その型締シリンダの何れか一方又は両方の軸線上の可動盤内に、上記中間板を型開時に上記固定型に押圧するシリンダとピンとによる支持装置を設けてなる、というものである。
【０００８】
上記回転軸は、可動盤の後方に突出した後端部に、駆動軸を軸端に連結した回転用モータと、進退移動装置とを備え、その進退移動装置は縮径軸部に中央部をベアリングを介し嵌挿して、回転軸と軸方向に一体的に結合した進退作動板と、その進退作動板の両端にピストンロッドをそれぞれ連結して可動盤側に横設した一対の移動用シリンダとからなり、その進退移動装置の上記進退作動板に上記回転用モータを取付けてなる、というものである。
【０００９】
上記中間板は、上記一次成形用の固定型と二次成形用の固定型と臨む板面に、上記可動盤に設けた可動型の一次側と二次側のコア型を嵌挿する穴部を有し、その穴部両側を上記支持装置の押圧ピンが型開時に当接される構成からなる、というものである。
【００１０】
また上記中間板は、上記一次成形用の固定型と二次成形用の固定型に臨む板面に、固定型と共にキャビティを形成する凹所を有し、その穴部の可動盤側の板面を上記支持装置の押圧ピンが型開時に当接する構成からなる、というものでもある。
【００１１】
上記構成では、２基の射出装置ごとに型締シリンダを正対配置したことから、可動盤が同時に受ける射出圧が両側の二個所であっても、射出圧は各型締シリンダにより受け止められるので、中央部部に配置した１基の型締シリンダにより両側二個所の射出圧を受けた場合に起き易い可動盤の撓みが防止され、可動盤の盤厚を増して射出圧に対抗させる必要がなくなるので、成形機の小型化と高速型開閉化を図ることができる。
【００１２】
また離型時には、型締シリンダの軸線上の可動盤内に設けた支持装置の押圧ピンにより、中間板を固定型に押圧支持して可動盤と中間板の型開を先行させることができるので、抜きテーパーの角度が小さなコア型の抜出しが容易に行え、また一次成形品と製品の両方を固定型内に長く置くことができるので、熱硬化性樹脂の成形では、硬化時間を長く維持して良品の成形を図ることができる。
【００１３】
【発明の実施の形態】
図中１は型締装置、２は型締装置１に向けて並行に設けた２基の射出装置で、型締装置１と共に機台３に設置してある。
【００１４】
上記型締装置１は、複数本のタイバー４により連結して機台３上に対設した固定盤５及び受圧盤６と、上記タイバー４に挿通支持して両盤間に進退自在に設けた可動盤７と、固定盤５の対称位置に並設した一次成形用の固定型８及び二次成形用の固定型９と、その固定型８，９にノズルタッチした上記射出装置２，２と同一の軸線Ｘ−Ｘ上に個々に配置して後側の受圧盤６に取付け、型締ラム１０を継ぎ部材１１を介し可動盤７に連結して、各射出装置２，２に正対配置した２基の型締シリンダ１２，１２とを有する。
【００１５】
また上記可動盤７は、固定盤５の対向面に取付けた設置板１３と、その設置板１３に取付けた可動型１４とを有する。可動型１４には上記固定型８，９とそれぞれ型閉して、キャビティを形成する一次成形用のコア型８ａと二次成形用のコア型９ａが突設してあり、その可動型１４と上記固定盤５との間に、固定型８，９のそれぞれに臨む板面に、コア型８ａ，９ａを嵌挿する穴部を設けた中間板１６が、可動盤７の中心部に回転かつ進退自在に挿通した回転軸１５（図２参照）の先端に取付けて設けてある。この中間板１６のコア型８ａを嵌挿する穴部周囲には、図７に示すような一次成形品４０の開口縁を成形するキャビティの一部が凹設してある。
【００１６】
上記回転軸１５の両側の可動盤内には、中間板１６の支持装置１７が設けてあり、可動盤７から突出した回転軸１５の後端部には、中間板１６の回転用モータ１８と進退移動装置１９（図２参照）とが設けてある。
【００１７】
上記回転軸１５はスプライン軸からなり、図２に示すように、可動盤７の中心部に穿設した両端密閉の軸受穴２０に回転自在に嵌挿した支持筒２１に挿通するとともに、外周囲に施したスプラインを支持筒内のボールスプライン部材２１ａを介し噛合して可動盤７に設けられ、その回転軸１５の設置板１３及び可動型１４を貫通して外部に突出した先端に、中間板１６が水平に取付けてある。
【００１８】
また可動盤７の後方に突出した回転軸１５の後端には、可動盤７の後面に突設した左右一対の支持部材２２の間に位置した油圧又は電動の上記回転用モータ１８が、駆動軸１８ａをキーや角軸等により嵌合して連結してあり、その駆動軸１８ａにより中間板１６と支持筒２１とが回転するようにしてある。この支持筒２１の前端には回転板２１ｂが連結してあり、これにより中間板１６が上記固定型８，９間を回転移動するように設けた図示しない位置決めピンが、設置板１３に設けたブッシュに当たることで回転角を制御している。
【００１９】
上記回転軸１５の後端部は、図２に示すように、縮径軸部１５ａに形成してあり、その縮径軸部１５ａに縦長の進退作動板２４が軸方向に一体的に取付けてある。この進退作動板２４の取付けは、可動盤７の背面に一端を固定した上下一対のガイドロッド２３，２３の他端を、両方の継ぎ部材１１，１１にわたり横架した上下の支持杆２２，２２に止着して、回転軸１５の上下に並行に設け、そのガイドロッド２３，２３に進退作動板２４を挿通支持するとともに、前後面板２４ａ，２４ｂと共に中央部を軸部周囲のベアリングを介し嵌挿して行われ、その進退作動板２４の上下両端に、可動盤７の上下面に横設した油圧作動の移動用シリンダ２５，２５のピストン２５ａ、２５ａをピンにより連結して、上記進退移動装置１９を構成している。
【００２０】
また進退作動板２４の後面板２４ｂには、上記回転用モータ１８が取付けてあり、これにより進退作動板２４を固定側として回転用モータ１８により回転軸１５及び上記中間板１６の回転が行えるとともに、上記移動用シリンダ２５，２５により回転用モータ１８を、回転軸１５及び進退作動板２４と一緒に進退移動するようにしてある。
【００２１】
上記支持装置１７は、図３に示すように、上記継ぎ部材１１の先端部内に形成したシリンダ２６と、そのシリンダ内のピストン２７の先端に取付けて、可動盤内の空所２８に進退自在に設けた突出板２９と、その突出板２９の両端に取付けて上記設置板１３及び可動型１４に貫挿し、先端を上記中間板１６に当接した押圧ピン３０，３０とからなる。
【００２２】
なお、３１，３１は受圧盤６の両側に設けた油圧作動の開閉シリンダ、３１ａ，３１ａは先端を可動盤７に連結したピストンである。３２は中間板１６の温調管路（図は省略）を内装した支軸で、固定盤５の中心部に挿通支持して、回転軸１５の先端に共に進退移動するように接続してある。
【００２３】
次に図４〜図６により型開閉及び型締動作について説明する。
図１に示す型開状態において、開閉シリンダ３１，３１の作動によりピストン３１ａ，３１ａが伸長すると、中間板１６が固定型８，９に接するまで可動盤７が固定盤５に向かって前進し、固定型８，９とコア型８ａ，９ａが中間板１６を挟んで型閉する。
【００２４】
この型閉後に、２基の型締シリンダ１２，１２に同時に油圧を加えると、一次成形側と二次成形側の二個所で、型締ラム１０，１０による可動盤７の加圧が生じて型締が行われる。この型締後に２基の射出装置２，２からノズルタッチした固定型８，９のそれぞれに溶融樹脂が射出されると、射出圧は射出装置２，２ごとに正対位置した型締シリンダ１２，１２の型締ラム１０，１０により受け止められる。これにより射出圧が掛かる部位が可動盤７の両側の二個所であっても、型締シリンダ１２，１２の油圧によりそれぞれ加圧支持されるので、可動盤７に射出圧による撓みの発生はなく、また撓み防止のために盤厚を増す必要もなくなる。
【００２５】
樹脂の射出終了後に、２基の型締シリンダ１２，１２に対する油圧力を除き、開閉シリンダ３１，３１及び移動用シリンダ２５，２５のピストン縮小側と、支持装置１７のシリンダ２６のピストン伸長側とに油圧力を加えると、可動盤７が後退移動する一方、進退作動板２４と突出板２９が回転軸１５と押圧ピン３０，３０を前進するようになり、そこに生じた相対的な移動によって、中間板１６が可動盤７の後退にかかわらず回転軸１５と押圧ピン３０，３０とにより固定型８，９に強く押し付けられる。
【００２６】
これにより図５及び図７に示すように、可動型１４が中間板１６から離れ、コア型８ａが固定型８内の一次成形品４０から、またコア型９ａは固定型９内の異色又は異材質樹脂が複合成形された製品４１とからそれぞれ同時に抜け出て、可動型１４と中間板１６の離型が先に行われるようになる。
【００２７】
この可動型１４の先行離型では、中間板１６のコア型８ａ，９ａの両側の板面を複数本の押圧ピン３０が押さえ付けるので、製品構造によって抜きテーパーの角度が小さく制限されたコア型８ａ，９ａでも容易に抜き出すことができるようになる。また樹脂が熱硬化性樹脂の場合には、中間板１６の後退移動まで固定型８，９に置かれるので、固定型８，９からの離型を先行する場合よりも硬化時間を長く維持することができる。
【００２８】
次に、上記可動盤７が型開位置まで後退すると、支持装置１７のシリンダ２６のピストン縮小側に油圧力が加えられて、ピストン２６により突出板２９と押圧ピン３０，３０とが可動型１４の盤面まで引き戻される。これに引き続いて移動用シリンダ２５，２５のピストン伸長側にも油圧力が加えられ、進退作動板２４による回転軸１５の後退により、中間板１６の可動盤側への引き戻しが、コア型８ａ，９ａから離れた後の回転移送に支障を来さない位置まで行われる（図６参照）。
【００２９】
この引き戻しにより一次成形品４０及び製品４１が、中間板１６に付着して固定型８，９から離型する。製品４１の取出しは固定盤５と中間板１６との間にて、エアブローやロボットなどを用いて行われる。この製品取出し後に上記回転用モータ１８を作動すると、中間板１６が回転軸１５により１８０°回転して、一次成形品４０が二次成形側に移送され、固定型９とコア型９ａとの間に位置するようになる。一次成形側では製品４１が除かれた穴部が固定型８とコア型８ａとの間に位置する。
【００３０】
その後に、上記移動用シリンダ２５，２５を更に伸長作動して進退作動板２４により回転軸１５と共に中間板１６を後退移動し、型開位置にある可動盤７の盤面まで戻してから、上記開閉シリンダ３１，３１の伸長作動による型閉と、型締シリンダによる型締を行って、次の射出行程に移行する。
【００３１】
図８は、上記コア型８ａ，９ａを要せず、固定型８，９と中間板１６の固定型当接面に形成した凹所とによるキャビティに、一次成形品４０と製品４１とをそれぞれ形成する場合の部分図であって、この場合には、上記可動型１４に代えて、設置板１３に中間板１６の受け盤３３を取付けるだけで他に変更はなく、上記工程と同様な順序をもって固定型８，９と中間板１６及び可動盤７の型締を行い得る。このようなことから支持装置１７の押圧ピン３０により中間板１６の押えは、コア型８ａ，９ａの有無に関係なく行え、それなりの効果を奏する。
【図面の簡単な説明】
【図１】この発明に係わる多色又は複合射出成形機の平面図である。
【図２】可動盤の縦断側面図である。
【図３】可動盤の端部平断面図である。
【図４】型閉状態を示す型締装置の部分平面図である。
【図５】可動型と中間板の型開状態を示す型締装置の部分平面図である。
【図６】可動型と中間板及び固定型の型開状態を示す型締装置の部分平面図である。
【図７】一次成形側（Ａ）と二次成形側（Ｂ）の可動型と中間板の型開状態を示す平断面図である。
【図８】他の実施形態の一次成形側（Ａ）と二次成形側（Ｂ）の可動型と中間板の型開状態を示す平断面図である。
【符号の説明】
１型締装置
２射出装置
３機台
４タイバー
５固定盤
６受圧盤
７可動盤
８一次成形用の固定型
８ａコア型
９二次成形用の固定型
９ａコア型
１０型締ラム
１１継ぎ部材
１２型締シリンダ
１４可動型
１５回転軸
１６中間板
１７中間板の支持装置
１８回転用モータ
１９進退移動装置
２５開閉シリンダ
４０一次成形品
４１製品[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, by rotating an intermediate plate provided between a fixed platen and a movable platen, an injection-molded primary molded product is transferred to a secondary molding side, and a resin of a different color or a different material is secondarily applied to the primary molded product. The present invention relates to an injection molding machine for a multicolor or composite molded article to be molded.
[0002]
[Prior art]
A well-known multi-color or composite injection molding machine has a structure in which two injection devices for injecting resin for each mold are provided, and the output of both injection devices is received by one mold clamping cylinder. The rotary transfer to the secondary molding side is performed by the rotary plate on the movable platen side to which the core die is attached.
In addition, when the primary molded product is transferred to the secondary molding side by a rotary transfer table provided between the fixed platen and the movable mold on the movable platen side, the push pin is moved forward together with the rotating shaft to advance the rotary transfer table. In some cases, the protruding pin is pulled out at the same time when the protruding pin is separated from the movable mold body (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-3-264318 (page 3-4, FIG. 1-3).
[0004]
[Problems to be solved by the invention]
In a structure in which one mold clamping cylinder is arranged for two well-known injection devices, the position of the mold clamping cylinder is located at the center of the movable platen, whereas the injection power is concentrated on both sides of the movable platen. In addition, the mold clamping force at both ends where the mold is mounted tends to be insufficient, and when the firing power increases, the movable plate is bent, and in some cases, the parting line is shifted. This bending can be solved by increasing the thickness of the movable plate, but the increase in thickness causes an increase in the size of the mold clamping device, and also increases the weight of the movable plate, which has problems such as affecting the mold opening and closing speed. .
[0005]
Further, in the cited document 1, the push pin is in contact with the rotary transfer table. When the movable pin body is separated from the fixed mold body, the push pin pushes the rotary transfer table forward to rotate the rotary transfer table. Since the ejecting pin and the presser pin of the molded product do not hinder the rotational transfer of the transfer table, it is extracted from the rotary transfer table. There is a problem that can not be carried out.
[0006]
An object of the present invention is to solve the bending of the movable platen when receiving the injection pressure of two injection devices by one mold clamping cylinder, and to open the movable die and the intermediate plate before opening the die, The object of the present invention is to provide a new multi-color or composite injection molding machine which can easily pull out a core mold having a small angle and can be applied to maintenance of a curing time in molding of a thermosetting resin.
[0007]
[Means for Solving the Problems]
The present invention according to the above object is to provide a fixed mold for primary molding and a fixed mold for secondary molding side by side at a symmetrical position of a fixed board, and connecting the fixed board and a mold clamping ram of a mold clamping cylinder to the fixed board. The intermediate plate that rotates and transfers the primary molded product to the fixed mold for secondary molding is mounted on the rotating shaft that is inserted through the center of the movable plate so that it can rotate and move forward and backward In a multi-color or composite injection molding machine provided with two injection devices in parallel by nozzle touch for each of the fixed dies, two mold clamping cylinders are used, and each mold clamping cylinder is the same as the injection device. A support device is provided by a cylinder and a pin which are individually arranged directly on the axis, and which presses the intermediate plate against the fixed mold when the mold is opened, in a movable platen on one or both axes of the mold clamping cylinder. It becomes.
[0008]
The rotary shaft has a rear end protruding rearward of the movable platen, a rotating motor having a drive shaft connected to the shaft end, and an advance / retreat moving device. An advancing / retracting operation plate which is fitted and inserted through a bearing and is integrally connected to the rotating shaft in the axial direction, and a pair of moving cylinders laterally provided on the movable platen side by connecting piston rods to both ends of the advancing / retreating operation plate, respectively; And the rotation motor is attached to the advance / retreat operation plate of the advance / retreat moving device.
[0009]
The intermediate plate has a hole for fitting the primary and secondary core molds of the movable mold provided on the movable plate on a plate surface facing the fixed mold for primary molding and the fixed mold for secondary molding. And the pressing pin of the supporting device is in contact with both sides of the hole when the mold is opened.
[0010]
The intermediate plate has a recess forming a cavity together with the fixed mold on a plate surface facing the fixed mold for the primary molding and the fixed mold for the secondary molding, and a plate surface on the movable platen side of the hole portion. Is configured such that the pressing pin of the supporting device comes into contact when the mold is opened.
[0011]
In the above configuration, since the mold clamping cylinders are arranged facing each other for each of the two injection devices, the injection pressure is received by each mold clamping cylinder even if the movable plate receives two simultaneous injection pressures on both sides. In addition, it is necessary to increase the thickness of the movable plate to counter the injection pressure by preventing the movable plate from being easily bent when receiving the injection pressure at two places on both sides by one mold clamping cylinder disposed at the central portion. Therefore, the molding machine can be reduced in size and the mold can be opened and closed at high speed.
[0012]
Also, at the time of mold release, the intermediate plate can be pressed and supported on the fixed mold by the pressing pins of the support device provided in the movable plate on the axis of the mold clamping cylinder, and the movable plate and the intermediate plate can be opened earlier. The core die with a small taper angle can be easily pulled out, and both the primary molded product and the product can be placed in the fixed mold for a long time. Thus, a good product can be formed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
In the drawing, reference numeral 1 denotes a mold clamping device, and 2 denotes two injection devices provided in parallel to the mold clamping device 1, which are installed together with the mold clamping device 1 on a machine base 3.
[0014]
The mold clamping device 1 is provided with a fixed plate 5 and a pressure receiving plate 6 which are connected to each other by a plurality of tie bars 4 and opposed to the machine base 3, and is inserted into and supported by the tie bars 4 so as to be movable between the two plates. A movable platen 7, a fixed die 8 for primary molding and a fixed die 9 for secondary molding, which are juxtaposed at symmetrical positions of the fixed platen 5, and the injection devices 2 and 2 which nozzle-touch the fixed dies 8 and 9; They are individually arranged on the same axis XX and attached to the rear pressure receiving plate 6, and the mold clamping ram 10 is connected to the movable platen 7 via the joint member 11, and is directly opposed to each of the injection devices 2 and 2. And two mold clamping cylinders 12, 12.
[0015]
The movable platen 7 has an installation plate 13 attached to the facing surface of the fixed platen 5 and a movable die 14 attached to the installation plate 13. The movable mold 14 is provided with a core mold 8a for primary molding and a core mold 9a for secondary molding which are closed with the fixed molds 8 and 9 to form cavities, respectively. An intermediate plate 16 having a hole for inserting the core dies 8a and 9a on the plate surface facing each of the fixed dies 8 and 9 between the fixed plate 5 and the fixed plate 5 rotates at the center of the movable plate 7 and It is attached to the tip of a rotating shaft 15 (see FIG. 2) which is inserted to be able to move forward and backward. A part of the cavity for forming the opening edge of the primary molded product 40 as shown in FIG. 7 is recessed around the hole portion of the intermediate plate 16 in which the core die 8a is inserted.
[0016]
A support device 17 for an intermediate plate 16 is provided in the movable platen on both sides of the rotary shaft 15, and a rotation motor 18 for the intermediate plate 16 is provided at a rear end of the rotary shaft 15 protruding from the movable platen 7. An advance / retreat moving device 19 (see FIG. 2) is provided.
[0017]
The rotary shaft 15 is formed of a spline shaft. As shown in FIG. 2, the rotary shaft 15 is inserted through a support cylinder 21 rotatably fitted into a bearing hole 20 having a closed end at the both ends and formed in the center of the movable platen 7, and has an outer periphery. Is provided on the movable platen 7 through a ball spline member 21a in the support cylinder, and the intermediate plate is attached to the tip of the rotary shaft 15 which protrudes to the outside through the installation plate 13 and the movable die 14 and the intermediate plate. 16 is mounted horizontally.
[0018]
At the rear end of the rotating shaft 15 projecting rearward from the movable platen 7, the hydraulic or electric rotation motor 18 located between a pair of left and right support members 22 projecting from the rear surface of the movable platen 7 is driven. The shaft 18a is fitted and connected by a key, a square shaft or the like, and the intermediate plate 16 and the support cylinder 21 are rotated by the drive shaft 18a. A rotary plate 21 b is connected to the front end of the support cylinder 21, whereby positioning pins (not shown) provided so that the intermediate plate 16 rotates between the fixed dies 8 and 9 are provided on the installation plate 13. The rotation angle is controlled by hitting the bush.
[0019]
As shown in FIG. 2, the rear end of the rotary shaft 15 is formed in a reduced diameter shaft portion 15a, and a vertically elongated reciprocating operation plate 24 is integrally attached to the reduced diameter shaft portion 15a in the axial direction. is there. The reciprocating operation plate 24 is mounted by connecting the other ends of a pair of upper and lower guide rods 23, 23 having one ends fixed to the back surface of the movable plate 7, to the upper and lower support rods 22, 22, which span the two joining members 11, 11. And provided parallel to the upper and lower sides of the rotary shaft 15 so that the guide rods 23, 23 are inserted and supported by the reciprocating operation plate 24, and the center part is fitted together with the front and rear face plates 24a, 24b via bearings around the shaft part. The pistons 25a, 25a of hydraulically operated moving cylinders 25, 25 provided on the upper and lower surfaces of the movable platen 7 are connected to the upper and lower ends of the moving plate 24 by pins. 19.
[0020]
The rotation motor 18 is mounted on the rear face plate 24b of the advance / retreat operation plate 24, so that the rotation shaft 15 and the intermediate plate 16 can be rotated by the rotation motor 18 with the advance / retreat operation plate 24 fixed. The rotation motor 18 is moved forward and backward together with the rotating shaft 15 and the forward / backward operation plate 24 by the moving cylinders 25 and 25.
[0021]
As shown in FIG. 3, the support device 17 is attached to a cylinder 26 formed in the distal end of the joint member 11 and a distal end of a piston 27 in the cylinder so as to be able to advance and retreat to a space 28 in the movable platen. It comprises a protruding plate 29 provided, and pressing pins 30, 30 which are attached to both ends of the protruding plate 29, penetrate through the installation plate 13 and the movable mold 14, and have front ends in contact with the intermediate plate 16.
[0022]
Reference numerals 31 and 31 denote hydraulically operated open / close cylinders provided on both sides of the pressure receiving plate 6, and 31a and 31a denote pistons each having a distal end connected to the movable plate 7. Reference numeral 32 denotes a support shaft in which a temperature control pipe (not shown) of the intermediate plate 16 is provided. The support shaft 32 is inserted into and supported by the center of the fixed platen 5 and connected to the tip of the rotary shaft 15 so as to move forward and backward. .
[0023]
Next, the mold opening / closing and mold clamping operations will be described with reference to FIGS.
In the mold open state shown in FIG. 1, when the pistons 31a, 31a are extended by the operation of the open / close cylinders 31, 31, the movable platen 7 advances toward the fixed platen 5 until the intermediate plate 16 contacts the fixed dies 8, 9. The fixed dies 8, 9 and the core dies 8a, 9a are closed with the intermediate plate 16 therebetween.
[0024]
When hydraulic pressure is simultaneously applied to the two mold clamping cylinders 12 and 12 after the mold is closed, pressurization of the movable platen 7 by the mold clamping rams 10 and 10 occurs at two locations on the primary molding side and the secondary molding side. The mold is clamped. When the molten resin is injected from the two injection devices 2 and 2 into the fixed dies 8 and 9 to which the nozzles have been touched, respectively, after the mold clamping, the injection pressure is increased by the mold clamping cylinders 12 that are directly opposed to the injection devices 2 and 2 respectively. , 12 are received by the clamping rams 10, 10. Accordingly, even if the injection pressure is applied to two locations on both sides of the movable platen 7, the movable platen 7 is pressurized and supported by the hydraulic pressure of the mold clamping cylinders 12 and 12, so that the movable platen 7 is not bent by the injection pressure. In addition, it is not necessary to increase the thickness of the board for preventing bending.
[0025]
After the injection of the resin is completed, the hydraulic pressures on the two clamping cylinders 12, 12 are removed, and the piston reduction side of the opening / closing cylinders 31, 31 and the moving cylinders 25, 25, and the piston extension side of the cylinder 26 of the support device 17, When the hydraulic pressure is applied to the movable plate 7, the movable platen 7 moves backward, while the reciprocating operation plate 24 and the protruding plate 29 advance the rotary shaft 15 and the pressing pins 30, 30. The intermediate plate 16 is strongly pressed against the fixed dies 8 and 9 by the rotating shaft 15 and the pressing pins 30 and 30 regardless of the retreat of the movable platen 7.
[0026]
5 and 7, the movable mold 14 is separated from the intermediate plate 16, the core mold 8a is separated from the primary molded product 40 in the fixed mold 8, and the core mold 9a is differently colored or different in the fixed mold 9. The resin material is simultaneously released from the composite molded product 41, and the movable mold 14 and the intermediate plate 16 are released first.
[0027]
In the preceding mold release of the movable mold 14, since the plurality of pressing pins 30 press the plate surfaces on both sides of the core molds 8a and 9a of the intermediate plate 16, the core mold in which the angle of the extraction taper is limited by the product structure is small. 8a and 9a can be easily extracted. In the case where the resin is a thermosetting resin, the intermediate plate 16 is placed on the fixed dies 8 and 9 until the intermediate plate 16 retreats, so that the curing time is maintained longer than in the case where the release from the fixed dies 8 and 9 precedes. be able to.
[0028]
Next, when the movable platen 7 is retracted to the mold opening position, an oil pressure is applied to the piston reduction side of the cylinder 26 of the support device 17, and the projection plate 29 and the pressing pins 30, 30 are moved by the piston 26 to the movable mold 14. To the board. Subsequently, hydraulic pressure is also applied to the piston extension side of the transfer cylinders 25, 25, and the rotary shaft 15 is retracted by the advance / retreat operating plate 24, so that the intermediate plate 16 is pulled back to the movable platen side, and the core mold 8a, The rotation is performed to a position where it does not hinder the rotational transfer after leaving from 9a (see FIG. 6).
[0029]
By this pulling back, the primary molded product 40 and the product 41 adhere to the intermediate plate 16 and are released from the fixed dies 8 and 9. The product 41 is taken out between the fixed platen 5 and the intermediate plate 16 using an air blow or a robot. When the rotation motor 18 is operated after the product is taken out, the intermediate plate 16 is rotated by 180 ° by the rotation shaft 15 and the primary molded product 40 is transferred to the secondary molding side, and the intermediate mold 16 is moved between the fixed mold 9 and the core mold 9a. Will be located at On the primary molding side, the hole from which the product 41 is removed is located between the fixed die 8 and the core die 8a.
[0030]
After that, the moving cylinders 25, 25 are further extended, the intermediate plate 16 is moved backward together with the rotating shaft 15 by the advance / retreat operating plate 24, and returned to the surface of the movable platen 7 at the mold opening position. The mold is closed by the extension operation of the cylinders 31, 31 and the mold is clamped by the mold clamping cylinder, and the process proceeds to the next injection stroke.
[0031]
FIG. 8 does not require the core dies 8a and 9a, and the primary molded product 40 and the product 41 are respectively placed in the cavities formed by the fixed dies 8 and 9 and the recesses formed in the fixed die contact surface of the intermediate plate 16 respectively. It is a partial view in the case of forming, in this case, in place of the movable die 14, only the receiving plate 33 of the intermediate plate 16 is mounted on the installation plate 13, and there is no other change, and the same order as in the above process is performed. With this, the fixed dies 8, 9 and the intermediate plate 16 and the movable platen 7 can be clamped. For this reason, the pressing of the intermediate plate 16 by the pressing pins 30 of the support device 17 can be performed regardless of the presence or absence of the core dies 8a and 9a.
[Brief description of the drawings]
FIG. 1 is a plan view of a multicolor or composite injection molding machine according to the present invention.
FIG. 2 is a vertical sectional side view of a movable board.
FIG. 3 is a plan sectional view of an end of the movable platen;
FIG. 4 is a partial plan view of the mold clamping device showing a mold closed state.
FIG. 5 is a partial plan view of the mold clamping device showing a mold open state of the movable mold and the intermediate plate.
FIG. 6 is a partial plan view of the mold clamping device showing a mold open state of the movable mold, the intermediate plate, and the fixed mold.
FIG. 7 is a plan sectional view showing a movable mold and an intermediate plate in an open state on a primary molding side (A) and a secondary molding side (B).
FIG. 8 is a plan cross-sectional view showing a mold open state of a movable mold and an intermediate plate on a primary molding side (A) and a secondary molding side (B) of another embodiment.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 mold clamping device 2 injection device 3 machine base 4 tie bar 5 fixed plate 6 pressure receiving plate 7 movable plate 8 fixed mold 8a for primary molding 9 core mold 9 fixed mold 9a for secondary molding core mold 10 mold ram 11 joining member 12 Clamping cylinder 14 Movable mold 15 Rotary shaft 16 Intermediate plate 17 Intermediate plate support device 18 Rotation motor 19 Advance / retreat movement device 25 Opening / closing cylinder 40 Primary molded product 41 Product

Claims

固定盤の対称位置に一次成形用の固定型と二次成形用の固定型を並設し、その固定盤と、型締シリンダの型締ラムと連結して固定盤に対し進退自在に設けた可動盤との間に、一次成形品を二次成形用の固定型に回転移送する中間板を、可動盤の中心部に回転かつ進退自在に挿通した回転軸に取付けて設け、２基の射出装置を上記固定型ごとに並行にノズルタッチして設けた多色又は複合射出成形機において、
上記型締シリンダを２基として、各型締シリンダを上記射出装置と同一軸線上に個々に正対配置し、その型締シリンダの何れか一方又は両方の軸線上の可動盤内に、上記中間板を型開時に上記固定型に押圧するシリンダとピンとによる支持装置を設けてなることを特徴とする多色又は複合射出成形機。A fixed mold for primary molding and a fixed mold for secondary molding are arranged side by side at the symmetric position of the fixed plate, and the fixed plate and the mold clamping ram of the mold clamping cylinder are connected to the fixed plate so as to be able to move forward and backward with respect to the fixed plate. An intermediate plate for rotating and transferring a primary molded product to a fixed mold for secondary molding is attached to a rotating shaft inserted through the center of the movable plate so as to rotate and move back and forth between the movable plate and two injection units. In a multicolor or composite injection molding machine provided with a nozzle touching the apparatus in parallel for each fixed mold,
With the two clamping cylinders, each clamping cylinder is individually arranged on the same axis as the injection device, and the intermediate cylinder is placed in a movable platen on one or both axes of the clamping cylinder. A multi-color or composite injection molding machine, comprising a support device comprising a cylinder and a pin for pressing a plate against the fixed mold when the mold is opened.

上記回転軸は、可動盤の後方に突出した後端部に、駆動軸を軸端に連結した回転用モータと、進退移動装置とを備え、その進退移動装置は縮径軸部に中央部をベアリングを介し嵌挿して、回転軸と軸方向に一体的に結合した進退作動板と、その進退作動板の両端にピストンロッドをそれぞれ連結して可動盤側に横設した一対の移動用シリンダとからなり、その進退移動装置の上記進退作動板に上記回転用モータを取付けてなることを特徴とする請求項１記載の多色又は複合射出成形機。The rotating shaft includes a rotating motor having a drive shaft connected to a shaft end and a reciprocating moving device at a rear end protruding rearward of the movable platen. An advancing / retracting operation plate that is fitted and inserted through a bearing and is integrally connected to the rotating shaft in the axial direction; 2. The multi-color or composite injection molding machine according to claim 1, wherein said rotation motor is attached to said advance / retreat operation plate of said advance / retreat moving device.

上記中間板は、上記一次成形用の固定型と二次成形用の固定型と臨む板面に、上記可動盤に設けた可動型の一次側と二次側のコア型を嵌挿する穴部を有し、その穴部両側を上記支持装置の押圧ピンが型開時に当接される構成からなることを特徴とする請求項１記載の多色又は複合射出成形機。The intermediate plate has a hole for fitting the primary and secondary core molds of the movable mold provided on the movable plate on a plate surface facing the fixed mold for primary molding and the fixed mold for secondary molding. 2. The multi-color or composite injection molding machine according to claim 1, wherein the pressing pin of the supporting device is in contact with both sides of the hole when the mold is opened.

上記中間板は、上記一次成形用の固定型と二次成形用の固定型に臨む板面に、固定型と共にキャビティを形成する凹所を有し、その穴部の可動盤側の板面を上記支持装置の押圧ピンが型開時に当接する構成からなることを特徴とする請求項１記載の多色又は複合射出成形機。The intermediate plate has a recess forming a cavity together with the fixed mold on a plate surface facing the fixed mold for the primary molding and the fixed mold for the secondary molding. 2. The multi-color or composite injection molding machine according to claim 1, wherein the pressing pin of the supporting device is configured to abut when the mold is opened.