JP5426515B2

JP5426515B2 - Injection foam molding machine and injection foam molding method using the same

Info

Publication number: JP5426515B2
Application number: JP2010232596A
Authority: JP
Inventors: 三郎藤田; 俊彦苅谷
Original assignee: Mitsubishi Heavy Industries Plastic Techonologies Co Ltd
Current assignee: U MHI Platech Co Ltd
Priority date: 2010-10-15
Filing date: 2010-10-15
Publication date: 2014-02-26
Anticipated expiration: 2030-10-15
Also published as: JP2012086382A

Description

本発明は、キャビティ内に射出充填した発泡性溶融樹脂を、金型を寸開することにより発泡させ、高精度の発泡成形品が得られるようにする射出発泡成形機に関し、特に、固定型盤に対して可動型盤を進退可能に駆動するコアバック装置の構成と作動方法に関する。 The present invention relates to an injection foam molding machine in which foamable molten resin injected into a cavity is foamed by opening a mold so that a highly accurate foam molded product can be obtained, and in particular, a fixed mold platen. The present invention relates to a configuration and an operating method of a core back device that drives a movable platen so as to be movable back and forth.

射出発泡成形は、射出成形機により可塑化した発泡性樹脂を金型内に高速で射出充填し、射出充填が終わり金型に接している成形品の表面が冷却して硬化した後、金型の間隔を広げてキャビティの容積を拡大し、成形品の内圧を下げ成形品の内部を発泡膨張させて、軽くて丈夫な成形品を得ることを狙いとしたもので、この射出発泡成形方法は従来から知られている。 In the injection foam molding, foamable resin plasticized by an injection molding machine is injected and filled into the mold at high speed, and after the injection filling is finished, the surface of the molded product in contact with the mold is cooled and cured, and then the mold The injection foam molding method is intended to obtain a light and durable molded product by expanding the space of the cavity to expand the volume of the cavity, lowering the internal pressure of the molded product, and expanding and expanding the inside of the molded product. Conventionally known.

特許文献１に示す従来例の発泡性樹脂成形装置は、固定型盤に設けられた固定金型と、可動型盤に設けられた可動金型との間に、形成されるキャビティへ発泡剤混合樹脂を射出後、可動金型を型開き方向へ所定距離移動させて成形を行う発泡成形用の射出成形機において、可動型盤と固定型盤のいずれか一方に、サーボモータとねじを用いて他方の盤と当接し、可動金型と固定金型を離間させるための可動金型移動機構（コアバック装置）を設けたもので、サーボモータとねじの組合せによって可動金型を型開き方向へ移動させる際の速度、および停止位置を高精度に制御することで、高品質の発泡成形品を得ることを目的としている。 In the conventional foamable resin molding apparatus shown in Patent Document 1, a foaming agent is mixed into a cavity formed between a fixed mold provided on a fixed mold and a movable mold provided on a movable mold. In an injection molding machine for foam molding that performs molding by moving the movable mold a predetermined distance in the mold opening direction after resin injection, a servo motor and screws are used for either the movable mold platen or the fixed mold platen. A movable mold moving mechanism (core back device) is provided to contact the other board and separate the movable mold and the fixed mold. The combination of the servo motor and screw moves the movable mold in the mold opening direction. An object of the present invention is to obtain a high-quality foam molded article by controlling the moving speed and stop position with high accuracy.

特開２００２−３２１２６２号公報JP 2002-321262 A

特許文献１のように、可動型盤に固定されてはいるが、固定型盤とは当接しているだけで固定されていないコアバック装置は、可動型盤が型開き方向へ移動しすぎた場合、コアバック装置が固定型盤と当接していた面が離れてしまい、可動型盤を引き戻すなどの位置補正ができないので可動型盤の位置制御精度および成形品の肉厚精度を高めることが難しい。このため型締油室側に背圧を加えてバックアップ力を作用させ、コアバック装置が常に固定型盤から離れないようにする必要があった。しかし、バックアップ力はコアバック力と逆方向の力であり、コアバックの抵抗となるため、バックアップ力が過度に大きいとコバック力も過剰に大きな力が必要となる。過大なバックアップ力に抗して可動型盤を動作させるためには、コアバック装置を高容量の大型の装置が必要となる不具合が生じる。このためバックアップ力は当接している面が離れない程度の必要最小限にして、コアバック装置を大型にしない方が望ましい。しかし、コアバック装置が固定型盤と当接して離れない程度にするには、バックアップ力を成形品の発泡力と同等レベルに抑えることが望ましいが、発泡性樹脂の発泡力は樹脂原料や成形条件により異なるため、必要最小限のコアバック力を得るための調整は樹脂原料毎あるいは成形条件毎の試行錯誤が必要となり多くの手間を要した。 As in Patent Document 1, in the core back device that is fixed to the movable mold plate but is in contact with the fixed mold plate but not fixed, the movable mold plate has moved too much in the mold opening direction. In this case, the surface on which the core back device is in contact with the fixed mold plate is separated, and position correction such as pulling back the movable mold plate cannot be performed, so that the position control accuracy of the movable mold plate and the thickness accuracy of the molded product can be improved. difficult. For this reason, it is necessary to apply a back pressure to the mold clamping chamber side to apply a backup force so that the core back device does not always move away from the fixed mold platen. However, since the backup force is a force in the opposite direction to the core back force and becomes a resistance of the core back, if the backup force is excessively large, an excessively large force is also required. In order to operate the movable platen against an excessive backup force, there arises a problem that a large-capacity device having a high capacity is required for the core back device. For this reason, it is desirable that the backup force is kept to the minimum necessary so that the abutting surfaces are not separated and the core back device is not made large. However, in order to keep the core back device from coming into contact with the fixed mold plate, it is desirable to keep the backup force at the same level as the foaming force of the molded product. Since it differs depending on the conditions, adjustment to obtain the minimum required core back force requires trial and error for each resin raw material or each molding condition, which requires much labor.

上記の問題点に対し、本発明は以下の各手段により課題の解決を図る。
（１）第１の手段の射出発泡成形機は、可動型盤と、固定型盤と、両型盤の４隅に型締め用の油圧シリンダと、該油圧シリンダにより型締駆動されるタイバーと、可動型盤を固定型盤から離間する方向に移動させるコアバック装置と、該コアバック装置による可動型盤の移動速度、停止位置を制御する制御装置と、を備えた射出発泡成形機であって、
コアバック装置が、進退動作部材と、該進退動作部材を型開閉方向に進退動作させる進退駆動部材と、進退動作部材が前進して当接するストッパー部材と、進退動作部材とストッパー部材が当接後に、進退動作部材とストッパー部材を連結する連結装置と、を備えたコアバック装置であり、
進退動作部材と進退駆動部材は、可動型盤又は固定型盤のいずれか一方の型盤に固定され、ストッパー部材はもう一方の型盤に固定されていることを特徴とする。 With respect to the above problems, the present invention aims to solve the problems by the following means.
(1) An injection foam molding machine as a first means includes a movable mold platen, a fixed mold platen, hydraulic cylinders for clamping at four corners of both mold plates, and a tie bar driven by the hydraulic cylinder for clamping. The injection foam molding machine includes a core back device that moves the movable platen away from the fixed platen, and a control device that controls the moving speed and stop position of the movable platen by the core back device. And
The core back device includes an advancing / retreating member, an advancing / retreating drive member for advancing / retreating the advancing / retreating member in the mold opening / closing direction, a stopper member for advancing and abutting the advancing / retreating member, and after the advancing / retreating member and the stopper member abut A core back device comprising a connecting device for connecting the advancing / retreating operation member and the stopper member,
The advancing / retreating operation member and the advancing / retreating drive member are fixed to either the movable mold platen or the fixed mold platen, and the stopper member is fixed to the other mold platen.

（２）第２の手段の射出発泡成形機は、上記第１の手段の射出発泡成形機において、コアバック装置の連結装置が、ストッパー部材側に備えられたことを特徴とする。 (2) The injection foam molding machine of the second means is the injection foam molding machine of the first means, characterized in that the connecting device for the core back device is provided on the stopper member side.

（３）第３の手段の射出発泡成形機は、上記第１の手段の射出発泡成形機において、コアバック装置の連結装置が、進退動作部材側に備えられたことを特徴とする。 (3) The injection foam molding machine of the third means is characterized in that, in the injection foam molding machine of the first means, the connecting device of the core back device is provided on the advancing / retreating member side.

（４）第４の手段の射出発泡成形機は、上記第１の手段〜第３の手段のいずれかの手段の射出発泡成機において、コアバック装置の連結装置が割りナット部材と該割りナット部材を開閉する割りナット部材開閉駆動装置を備えたことを特徴とする。 (4) The injection foam molding machine of the fourth means is the injection foam molding machine of any one of the first to third means, wherein the connecting device of the core back device is the split nut member and the split nut. A split nut member opening / closing drive device for opening and closing the member is provided.

（５）第５の手段の射出発泡成形機は、上記第４の手段の射出発泡成形機において、コアバック装置の進退動作部材およびストッパー部材のそれぞれの当接部にフランジ形状を備え、当該フランジ部の進退動作部材およびストッパー部材のそれぞれの当接面の反対側面に傾斜を設け、割りナット部材の内側面に進退動作部材およびストッパー部材のフランジ部の傾斜と対応する傾斜を設けたことを特徴とする。 (5) The injection foam molding machine of the fifth means is the same as the injection foam molding machine of the fourth means, wherein the abutting portions of the advancing / retreating operation member and the stopper member of the core back device are provided with flange shapes, and the flange Inclination is provided on the side surface opposite to the contact surface of each of the advancing / retreating operation member and the stopper member, and an inclination corresponding to the inclination of the flange portion of the advancing / retreating operation member and the stopper member is provided on the inner surface of the split nut member And

（６）第６の手段の射出発泡成形機は、上記第１の手段または第２の手段の射出発泡成形機において、進退動作部材が端部に雌ねじを形成したナット部材を備えた進退動作部材であり、ストッパー部材側に備えられた連結装置が、端部にナット部材の雌ねじ形状と対応する雄ねじを有し回転自由に支持されたねじ部材と、該ねじ部材を回転駆動するねじ回転駆動装置を備え、ねじ部材の回転により進退動作部材とストッパー部材を螺合連結する連結装置であることを特徴とする。 (6) The injection foam molding machine of the sixth means is the advance / retreat operation member provided with a nut member in which the advance / retreat operation member forms a female screw at the end in the injection foam molding machine of the first means or the second means. And a connecting device provided on the stopper member side includes a screw member that has a male screw corresponding to the female screw shape of the nut member at the end and is rotatably supported, and a screw rotation driving device that rotationally drives the screw member And a connecting device for screwing and connecting the advancing / retreating operation member and the stopper member by rotation of the screw member.

（７）第７の手段の射出発泡成形機は、上記第１の手段または第２の手段の射出発泡成形機において、進退動作部材が端部に雄ねじ部材を設けた進退動作部材であり、前記ストッパー部材側に備えられた前記連結装置が、端部に前記進退動作部材の雄ねじ部材と対応する雌ねじを形成し、該雌ねじを回転自由に支持したナット部材と、ナット部材を回転駆動するナット回転駆動装置とを備え、ナット部材の回転により前記進退動作部材と前記ストッパー部材を螺合連結する連結装置であることを特徴とする。 (7) The injection foam molding machine of the seventh means is the advance / retreat operation member in which the advance / retreat operation member is provided with a male screw member at an end in the injection foam molding machine of the first means or the second means, The connecting device provided on the stopper member side forms a female screw corresponding to the male screw member of the advancing / retracting member at the end, and a nut member that rotatably supports the female screw, and a nut rotation that drives the nut member to rotate And a drive device, wherein the advance / retreat operation member and the stopper member are screwed and connected by rotation of a nut member.

（８）第８の手段の射出発泡成形機は、上記第１の手段または第２の手段の射出発泡成形機において、コアバック装置が進退動作部材の端部に磁性体製のフランジを備えと、ストッパー部材の端部に環状の電磁石を取付けた電磁石フランジを設けたストッパー部材とを備え、適時に前記電磁石に電流を通して進退動作部材とストッパー部材を磁力連結するコアバック装置であることを特徴とする。 (8) In the injection foam molding machine of the eighth means, in the injection foam molding machine of the first means or the second means, the core back device includes a magnetic flange at the end of the advancing / retreating member. And a stopper member provided with an electromagnet flange having an annular electromagnet attached to an end portion of the stopper member, and a core back device that magnetically connects the advancing / retreating member and the stopper member by passing current through the electromagnet at an appropriate time. To do.

（９）第９の手段の射出発泡成形機は、上記第１の手段及び第３の手段の射出発泡成形機において、コアバック装置が進退動作部材の端部に環状の電磁石を取付けた電磁石フランジを備え、ストッパー部材の端部に磁性体製のフランジを備え、適時に前記電磁石に電流を通して進退動作部材とストッパー部材を磁力連結するコアバック装置であることを特徴とする。 (9) An ninth aspect of the injection foam molding machine is the electromagnet flange in which the core back device has an annular electromagnet attached to the end of the advancing and retracting operation member in the first and third means of the injection foam molding machine. The core back device includes a flange made of a magnetic material at the end of the stopper member, and magnetically couples the advancing / retreating member and the stopper member through current through the electromagnet at an appropriate time.

（１０）第１０の手段の射出発泡成形方法は、上記第１〜第９のいずれかの手段の射出発泡成形機を用いた発泡成形方法であって、型締め用の油圧シリンダで型締駆動されるタイバーにより可動型盤と固定型盤を型締めし、可動側金型と固定側金型とで形成されたキャビティ内に発泡性樹脂を射出して発泡成形を行うとき、コアバック装置の進退動作部材を前進させてストッパー部材に当接させるステップと、コアバック装置の連結装置を作動させて進退動作部材とストッパー部材を隙間無く連結するステップと、進退動作部材を更に前進させて可動型盤を固定型盤から離間する方向に所定距離移動させて金型を開くステップと、コアバック装置の連結装置を作動させて進退動作部材とストッパー部材の連結を解くステップと、を含むことを特徴とする。 (10) The injection foam molding method of the tenth means is a foam molding method using the injection foam molding machine of any one of the first to ninth means, and is clamped by a hydraulic cylinder for mold clamping. When the mold mold is fixed by the tie bar, the foamable resin is injected into the cavity formed by the movable mold and the fixed mold, and the core back device is The step of advancing and retracting the advancing / retracting member to contact the stopper member, operating the connecting device of the core back device to connect the advancing / retreating member and the stopper member without gaps, and moving the advancing / retreating member further forward to move Moving the board away from the fixed mold board by a predetermined distance to open the mold, and operating the connecting device of the core back device to release the connection between the advancing and retracting member and the stopper member. And features.

請求項１〜請求項９に係わる発明は上記第１の手段〜第９の手段の射出発泡成形機であり、コアバック装置の連結装置を作動させて進退動作部材とストッパー部材を連結することで、可動型盤と固定型盤とをコアバック装置を介して連結させることができるので、コアバック装置を進退駆動制御する制御装置によって、発泡成形品の肉厚に大きく影響する可動型盤と固定型盤間の距離を高精度で制御できる。 The invention according to claims 1 to 9 is an injection foam molding machine according to the first to ninth means, wherein the advance / retreat operation member and the stopper member are connected by operating the connecting device of the core back device. The movable mold platen and the fixed mold platen can be connected via the core back device, so that the movable mold platen and the fixed mold plate, which greatly affect the thickness of the foam molded product, are controlled by the control device that controls the back and forth of the core back device. The distance between molds can be controlled with high accuracy.

請求項１０に係わる発明は上記第１０の手段の射出発泡成形方法であり、可動型盤と固定型盤を型締めしたとき、コアバック装置の連結装置を作動させて進退動作部材とストッパー部材を連結した状態でコアバック動作を行うので、可動金型のコアバック移動（寸開動作制御）および停止位置制御の精度が向上し、可動金型のオーバーランを防止し、コアバック装置の作動速度と寸開距離を制御することが容易となり、コアバック制御の設定が容易となるとともに、可動型盤の位置制御精度および成形品の肉厚精度を向上させることができる。 The invention according to claim 10 is the injection foam molding method of the tenth means, wherein when the movable mold platen and the fixed mold platen are clamped, the connecting device of the core back device is operated to move the advance / retreat operation member and the stopper member. Since the core back operation is performed in the connected state, the accuracy of the movable mold core back movement (dimensioning operation control) and stop position control is improved, the overrun of the movable mold is prevented, and the operating speed of the core back device is increased. Therefore, it is easy to control the opening distance, the setting of the core back control is facilitated, and the position control accuracy of the movable mold and the thickness accuracy of the molded product can be improved.

請求項２に係わる発明は、上記第２の手段の射出発泡成形機であり、重さのある連結装置を、固定部材であり高剛性構造を容易に得られるストッパー側に設けたので、連結装置の位置保持、振動抑制が容易となる。 The invention according to claim 2 is the injection foam molding machine of the second means, wherein the heavy connecting device is provided on the stopper side which is a fixed member and can easily obtain a high rigidity structure. It is easy to maintain the position of the lens and suppress vibration.

請求項３に係わる発明は、上記第３の手段の射出発泡成形機であり、連結装置及び進退動作駆動措置を動作軸側に集約して設けたので、動作ユニットを1体としてモジュール構造として、組み立て精度向上および取付作業性向上が容易となる。 The invention according to claim 3 is the injection foam molding machine of the third means, and since the connecting device and the advance / retreat operation drive measure are gathered on the operation shaft side, the operation unit is made into one unit as a module structure. Assembling accuracy and mounting workability can be improved easily.

請求項４及び請求項５に係わる発明は、上記第４及び第５の手段の射出発泡成形機であり、コアバック装置の連結装置割りナット部材に進退動作部材およびストッパー部材に設けた傾斜と対応する傾斜を設けたもので、当該斜面のクサビ効果により、割りナット部材を前進させる（割りナットを閉める）だけで、割りナット部材、進退動作部材、およびストッパー部材を隙間無く連結でき、且つ進退動作部材とストッパー部材を引き離すような力が加わっても、斜面同士の摩擦により割りナット部材開閉装置が小型であっても、進退動作部材とストッパー部材の連結を維持することができる。 The inventions according to claims 4 and 5 are the injection foam molding machines of the fourth and fifth means, which correspond to the inclination provided in the advance / retreat operation member and the stopper member in the connecting device split nut member of the core back device. With the wedge effect of the slope, the split nut member, the advance / retreat operation member, and the stopper member can be connected without gaps by simply moving the split nut member forward (closing the split nut), and the advance / retreat operation. Even if a force that separates the member and the stopper member is applied, even if the split nut member opening / closing device is small due to friction between the inclined surfaces, the connection between the advancing / retreating operation member and the stopper member can be maintained.

請求項６及び請求項７に係わる発明は、上記第６及び７の手段の射出発泡成形機であり、コアバック装置の連結手段は進退動作部材とストッパー部材のいずれか一方の部材に設置したボルトと、もう一方の部材に設置した前記のボルトに螺合するナットによるもので、進退動作部材とストッパー部材の連結力を向上させる必要がある場合、ボルトおよびナットの組数を増やすだけで、連結力を容易に向上させることができる。 The invention according to claims 6 and 7 is the injection foam molding machine according to the sixth and seventh means, wherein the connecting means of the core back device is a bolt installed on one of the advancing / retreating operation member and the stopper member. And if it is necessary to improve the connecting force between the advancing / retracting operation member and the stopper member, it can be connected by simply increasing the number of bolts and nuts. The power can be easily improved.

請求項８及び請求項９に係わる発明は、上記第８及び９の手段の射出発泡成形機であり、進退動作部材とストッパー部材を電磁力結合しようとするもので、連結装置自体には機械的動作部材がないので、摩耗が発生する箇所が少なく、かつ構造を簡略化できるため故障などの不具合を抑制することができる。 The inventions according to claims 8 and 9 are the injection foam molding machines according to the eighth and ninth means, wherein the advancing / retracting operation member and the stopper member are to be electromagnetically coupled. Since there is no moving member, there are few places where wear occurs and the structure can be simplified, so that problems such as failures can be suppressed.

本発明に係わる射出発泡成形機の側面図及び油圧制御系統図である。It is the side view and hydraulic control system diagram of the injection foam molding machine concerning this invention. 図１のコアバック装置とタイバーの配置を示す可動型盤の正面図である。It is a front view of the movable mold | type board | substrate which shows arrangement | positioning of the core back apparatus and tie bar of FIG. 図１の第１の実施形態のコアバック装置の配置を示す上面図である。It is a top view which shows arrangement | positioning of the core back apparatus of 1st Embodiment of FIG. 図３のコアバック装置のＡ部拡大図である（２点鎖線は型閉工程後の進退動作部材側を示す）。FIG. 4 is an enlarged view of a portion A of the core back device of FIG. 3 (a chain double-dashed line indicates the advancing / retracting operation member side after the mold closing step). 図３のコアバック装置の動作軸部材とストッパー部材が連結された状態を示す側面図である。It is a side view which shows the state with which the operating shaft member and stopper member of the core back apparatus of FIG. 3 were connected. 図５の連結部の詳細図である。It is detail drawing of the connection part of FIG. 図５のＢ方向矢視図である。It is a B direction arrow directional view of FIG. 図５のＣ方向矢視図である。It is a C direction arrow directional view of FIG. 図１の射出発泡成形機に取付けた第２の実施形態のコアバック装置の配置を示す上面図である。It is a top view which shows arrangement | positioning of the core back apparatus of 2nd Embodiment attached to the injection foam molding machine of FIG. 図９のコアバック装置のＤ部拡大図である。It is the D section enlarged view of the core back apparatus of FIG. 図１０のＥ方向矢視図である。It is an E direction arrow directional view of FIG. 図９のコアバック装置の動作軸部材が移動してストッパー部材に当接した状態を示す側面図である。FIG. 10 is a side view showing a state in which an operation shaft member of the core back device of FIG. 図９のコアバック装置の動作軸部材とストッパー部材が連結された状態を示す側面図である。FIG. 10 is a side view showing a state in which an operation shaft member and a stopper member of the core back device of FIG. 9 are connected. 図１の射出発泡成形機に取付けた第３の実施形態のコアバック装置の配置を示す上面図である。It is a top view which shows arrangement | positioning of the core back apparatus of 3rd Embodiment attached to the injection foam molding machine of FIG. 図１４のコアバック装置のＦ部拡大図である。It is the F section enlarged view of the core back apparatus of FIG. 図１５のＧ方向矢視図である。It is a G direction arrow line view of FIG. 図１５のコアバック装置の動作軸部材が移動してストッパー部材に当接した状態を示す側面図である。FIG. 16 is a side view showing a state in which an operation shaft member of the core back device of FIG. 図１７のＨ方向矢視図である。It is a H direction arrow line view of FIG.

この実施の形態は油圧型締式射出成形機を発泡成形に適応させたものである。
［第１の実施の形態］
第１の実施形態を図に基づいて説明する。図１は射出発泡成形機の側面図及び油圧制御系統図、図２は図１のコアバック装置とタイバーの配置を示す可動型盤の正面図、図３は図１の第１の実施形態のコアバック装置の配置を示す上面図、図４は図３のコアバック装置のＡ部拡大図（２点鎖線は型閉工程後の進退動作部材側を示す）、図５は図３のコアバック装置の進退動作部材とストッパー部材が連結された状態を示す側面図、図６は図５の連結部の詳細図、図７は図５のＢ方向矢視図、図８は図５のＣ方向矢視図である。 In this embodiment, a hydraulic mold-clamping injection molding machine is adapted to foam molding.
[First Embodiment]
A first embodiment will be described with reference to the drawings. 1 is a side view of an injection foam molding machine and a hydraulic control system diagram, FIG. 2 is a front view of a movable mold platen showing the arrangement of the core back device and tie bars of FIG. 1, and FIG. 3 is a diagram of the first embodiment of FIG. 4 is a top view showing the arrangement of the core back device, FIG. 4 is an enlarged view of part A of the core back device in FIG. 3 (the two-dot chain line shows the advancing and retracting member side after the mold closing process), and FIG. 5 is the core back in FIG. FIG. 6 is a detailed view of the connecting portion of FIG. 5, FIG. 7 is a view in the direction of arrow B in FIG. 5, and FIG. 8 is a direction of C in FIG. It is an arrow view.

図１において、符号１は基盤で、基盤１の一端には固定側金型４を取付けた固定型盤２が固設されている。固定型盤２にはストロークが短く断面積の大きな４基の型締シリンダ２ａが内蔵され、型締シリンダ２ａによって駆動されるラム６はタイバー７に直結され、図２に示すように、固定型盤２の各角隅に中心線に対して対称に設けられ油圧による型締動作を行うことができる。 In FIG. 1, reference numeral 1 denotes a base, and a fixed mold plate 2 to which a fixed mold 4 is attached is fixed to one end of the base 1. The fixed mold platen 2 includes four mold clamping cylinders 2a having a short stroke and a large cross-sectional area. A ram 6 driven by the mold clamping cylinder 2a is directly connected to a tie bar 7, and as shown in FIG. It is provided symmetrically with respect to the center line at each corner of the panel 2 and can perform a clamping operation by hydraulic pressure.

基盤１の上には固定型盤２に対向して可動側金型５を取付けた可動型盤３が移動可能に載置される。可動型盤３はボールねじ軸２２と同ボールねじ２２軸に螺合し可動型盤３に固設しているボールねじナット２３を組み合わせた型盤開閉手段４０によって基盤１の上を移動して可動側金型５を固定側金型４に対して開閉させることができる。 A movable mold plate 3 having a movable mold 5 attached thereto is movably mounted on the base 1 so as to face the fixed mold plate 2. The movable mold platen 3 is moved on the base plate 1 by a mold plate opening / closing means 40 combined with a ball screw shaft 22 and a ball screw nut 23 which is screwed to the ball screw shaft 22 and fixed to the movable mold platen 3. The movable mold 5 can be opened and closed with respect to the fixed mold 4.

型盤開閉手段４０は、ボールねじ軸２２が基盤１に固設された支持台４１、支持台４２において軸受けを介してラジアル方向、スラスト方向を支え、回転自由に支持される構成である。ボールねじ軸２２はサーボモータ４６、小コグベルトプーリー４５、コグベルト４３、大コグベルトプーリー４４を経て回転駆動される。 The platen opening / closing means 40 is configured such that the ball screw shaft 22 is supported on the support base 41 and the support base 42 fixed to the base 1 in the radial direction and the thrust direction via bearings, and is freely supported for rotation. The ball screw shaft 22 is rotationally driven through a servo motor 46, a small cog belt pulley 45, a cog belt 43, and a large cog belt pulley 44.

制御装置３０からの制御信号によりサーボモータ４６が回されるとボールねじ軸２２が回転駆動され、ボールねじナット２３が軸方向に押圧されて可動型盤３を移動（可動型盤３の前進または後退）させる。 When the servo motor 46 is rotated by a control signal from the control device 30, the ball screw shaft 22 is rotationally driven, and the ball screw nut 23 is pressed in the axial direction to move the movable mold 3 (advance of the movable mold 3 or Back).

型締シリンダ２ａの中を摺動するラム６はその可動型盤３側面にタイバー７が一体に直結され、固定型盤２に対向する可動型盤３が型閉のため近づいてきたとき、タイバー７は可動型盤３の角隅に空けられた複数の挿通孔をそれぞれ貫通する。 When the ram 6 that slides in the mold clamping cylinder 2a is directly connected to the side of the movable mold plate 3 with the tie bar 7 and the movable mold plate 3 facing the fixed mold plate 2 approaches to close the mold, 7 penetrates through a plurality of insertion holes formed in the corners of the movable mold 3.

型閉時、可動型盤３が固定型盤２側へ移動し、各タイバー７が可動型盤３の挿通孔を突き通り、固定側金型４と可動側金型５が当接した時、タイバー固定手段１１がタイバー７を可動型盤３に固定するようになっている。８は射出シリンダである。 When the mold is closed, the movable mold platen 3 moves to the fixed mold platen 2 side, each tie bar 7 passes through the insertion hole of the movable mold platen 3, and the fixed mold 4 and the movable mold 5 come into contact with each other. A tie bar fixing means 11 fixes the tie bar 7 to the movable platen 3. 8 is an injection cylinder.

型閉後、型締シリンダ２ａにより型締めされ、射出シリンダ８より溶融樹脂がキャビティ９内に射出される。その後、金型接触面の樹脂が固化した時点で、コアバック装置２０が寸開作動して固定側金型４，可動側金型５を開き、キャビティ９内の樹脂圧を降下させて溶融樹脂が発泡膨張する。可動型盤３に単数又は複数の型内圧センサ２９が取付けられ、可動側金型５を貫通してキャビティ９内の樹脂圧を検出することができる。この型内圧センサ２９は、キャビティ９内の発泡圧力を把握するために設けたものの、発泡圧力を把握する必要がない場合は、設けなくても支障ない。コアバック装置２０は、図１、図２、図３に示すように、固定型盤２、可動型盤３の４角に４組設置される。 After the mold is closed, the mold is clamped by the mold clamping cylinder 2 a, and the molten resin is injected into the cavity 9 from the injection cylinder 8. Thereafter, when the resin on the mold contact surface is solidified, the core back device 20 opens and opens the fixed side mold 4 and the movable side mold 5, and lowers the resin pressure in the cavity 9 to melt the resin. Expands and expands. One or a plurality of mold internal pressure sensors 29 are attached to the movable mold platen 3, and the resin pressure in the cavity 9 can be detected through the movable mold 5. Although this mold internal pressure sensor 29 is provided for grasping the foaming pressure in the cavity 9, if it is not necessary to grasp the foaming pressure, there is no problem even if it is not provided. As shown in FIGS. 1, 2, and 3, four sets of core back devices 20 are installed at four corners of the stationary mold plate 2 and the movable mold plate 3.

コアバック装置２０の具体的な構造を、図３及びそのＡ部拡大図である図４によって説明する。コアバック装置２０は、ボールねじナット１３と、ボールねじナット１３と螺合してボールねじナット１３を進退動作させる動作軸部材１２のボールねじ軸と、動作軸部材１２を駆動する駆動機構４８（減速機付サーボモータ）と、ボールねじナット１３が前進により当接するストッパー部材１８と、ボールねじナット１３とストッパー部材１８が当接後に、ボールねじナット１３とストッパー部材１８を連結する連結装置７０を備えている。 A specific structure of the core back device 20 will be described with reference to FIG. 3 and FIG. The core back device 20 includes a ball screw nut 13, a ball screw shaft of the operation shaft member 12 that is screwed into the ball screw nut 13 and moves the ball screw nut 13 forward and backward, and a drive mechanism 48 ( A servomotor with a speed reducer), a stopper member 18 with which the ball screw nut 13 abuts by advancing, and a connecting device 70 for coupling the ball screw nut 13 and the stopper member 18 after the ball screw nut 13 and the stopper member 18 abut. I have.

ボールねじ軸である動作軸部材１２は、図３に示すように、可動型盤３に固設された取付け部材４９に取付けられた図示しない多重のボールベアリングによってラジアル方向は自由に、スラスト方向を拘束して支えられている。ストッパー部材１８は固定型盤２に固設された支持板４７に取付けられる。 As shown in FIG. 3, the operation shaft member 12, which is a ball screw shaft, freely adjusts the thrust direction in the radial direction by a plurality of ball bearings (not shown) attached to an attachment member 49 fixed to the movable mold 3. Restrained and supported. The stopper member 18 is attached to a support plate 47 fixed to the fixed mold platen 2.

図４及び図６に示すように、ボールねじナット１３の端部には、割りナット部材１７に嵌めるテーパー面１５ａを有するテーパーフランジ１５が設けられている。図３に示す駆動機構４８（減速機付サーボモータ）が図１に示す制御装置３０の指令により回転速度と停止位置を制御しながら動作軸部材１２を回転駆動するとき、ボールねじナット１３が軸方向に移動する。ボールねじナット１３は、図７及び図８に示す回り止めバー１９により回転を抑えられている。 As shown in FIGS. 4 and 6, the end of the ball screw nut 13 is provided with a tapered flange 15 having a tapered surface 15 a that can be fitted to the split nut member 17. When the drive mechanism 48 (servo motor with speed reducer) shown in FIG. 3 rotates the operating shaft member 12 while controlling the rotation speed and stop position according to the command of the control device 30 shown in FIG. Move in the direction. The rotation of the ball screw nut 13 is suppressed by a detent bar 19 shown in FIGS.

動作軸部材１２にはボールねじナット１３が螺合され、ボールねじナット１３は可動型盤３に取付けられた回り止めバー１９により回り止めされているので、動作軸部材１２が回転駆動されるとボールねじナット１３は回転方向を拘束された状態で動作軸部材１２の軸方向に移動することができる。型締が行われたときに、ボールねじの回転は、図５に示すようにボールねじナット１３の端面に取付けられたテーパーフランジ１５の端面が丁度ストッパー部材１８の端面に当るように制御される。 A ball screw nut 13 is screwed onto the operation shaft member 12, and the ball screw nut 13 is prevented from rotating by a detent bar 19 attached to the movable platen 3, so that the operation shaft member 12 is rotationally driven. The ball screw nut 13 can move in the axial direction of the operation shaft member 12 in a state where the rotation direction is constrained. When the mold clamping is performed, the rotation of the ball screw is controlled so that the end surface of the taper flange 15 attached to the end surface of the ball screw nut 13 just contacts the end surface of the stopper member 18 as shown in FIG. .

本実施形態では進退動作部材をボールねじナット１３として示したが、進退動作部材をボールねじナット１３ではなく、ボールねじ軸としてもよい。この場合、ボールねじナット１３は型開閉方向に固定で、且つ回転自由に支持されるように型盤側に固定され、ボールねじ軸は回転方向に固定で、型開閉方向に移動自由に支持される必要がある。 In this embodiment, the advancing / retreating member is shown as the ball screw nut 13, but the advancing / retreating member may be a ball screw shaft instead of the ball screw nut 13. In this case, the ball screw nut 13 is fixed to the mold platen side so as to be supported in the mold opening / closing direction and to be freely rotated, and the ball screw shaft is fixed in the rotation direction and supported to be freely movable in the mold opening / closing direction. It is necessary to

連結装置７０は、図４に示すように、ボールねじナット１３に固設したナットフランジ１４と、割りナット部材１７と、ナットフランジ１４の側面の突き出し部材１４ａと、該突き出し部材１４ａに対称に取り付けられ割りナット部材１７を上下に開閉する一対のエアシリンダ１６を備えている。本実施形態では連結装置７０はボールねじナット１３に固設した例を示したが、連結装置７０をボールねじナット１３ではなくストッパー部材１８側に備えても良い。 As shown in FIG. 4, the coupling device 70 is mounted symmetrically on the nut flange 14 fixed to the ball screw nut 13, the split nut member 17, the projecting member 14a on the side surface of the nut flange 14, and the projecting member 14a. A pair of air cylinders 16 that open and close the split nut member 17 are provided. In the present embodiment, the connecting device 70 is fixed to the ball screw nut 13, but the connecting device 70 may be provided not on the ball screw nut 13 but on the stopper member 18 side.

ストッパー部材１８の端部にもテーパーフランジ１５のテーパー面１５ａに相対するテーパーフランジ１８ａが形成されており、動作軸部材１２とストッパー部材１８が当接し、連結装置７０が連結作用を行ったとき、図６に示すように、動作軸部材のテーパーフランジ１５のテーパー面１５ａとストッパー部材１８のテーパーフランジ１８ａが割りナット部材１７に挟まれて、クサビ効果により型開閉方向に隙間無く連結されるようになっている。このとき割りナット部材１７を上下に開閉するエアシリンダは、リンクを用いて１つのエアシリンダで、上下の割りナット部材１７を開閉する構造としてもよい。 A tapered flange 18a is formed at the end of the stopper member 18 so as to be opposed to the tapered surface 15a of the tapered flange 15. When the operating shaft member 12 and the stopper member 18 come into contact with each other and the connecting device 70 performs a connecting action, As shown in FIG. 6, the taper surface 15a of the taper flange 15 of the operation shaft member and the taper flange 18a of the stopper member 18 are sandwiched between the split nut members 17 so that they are connected without gaps in the mold opening and closing direction by the wedge effect. It has become. At this time, the air cylinder that opens and closes the split nut member 17 up and down may be configured to open and close the upper and lower split nut members 17 with one air cylinder using a link.

型締め、発泡膨張のための可動型盤３の移動等を行う油圧系統について説明する。図１において、型締シリンダ２ａの油圧制御回路は、制御装置３０、油圧ポンプ２６、油圧ポンプ２６から送り出される作動油の油圧を高圧、低圧の２段階に切り換え可能な電磁比例制御リリーフ弁２７、各型締シリンダ２ａへの作動油を型締用油室２ｂと型開用油室２ｃと切換えることができるロジック弁２８と油タンク２５とで構成される。 A hydraulic system for moving the movable mold platen 3 for mold clamping and foam expansion will be described. In FIG. 1, the hydraulic control circuit of the mold clamping cylinder 2a includes a control device 30, a hydraulic pump 26, an electromagnetic proportional control relief valve 27 that can switch the hydraulic pressure of hydraulic fluid fed from the hydraulic pump 26 into two stages, high pressure and low pressure. It is composed of a logic valve 28 and an oil tank 25 that can switch hydraulic oil to each mold clamping cylinder 2a between the mold clamping oil chamber 2b and the mold opening oil chamber 2c.

型締シリンダ２ａはタイバー７を進退させるためのラム６により型開用油室２ｃと型締用油室２ｂに仕切られており、更に型開用油室２ｃと型締用油室２ｂを連通させるバイパス油圧配管３３，３６と、バイパス油圧配管３３，３６上に型開用油室２ｃと型締用油室２ｂを連通／非連通を切換えるロジック弁２８を備え、型締め時は型開用油室２ｃと型締用油室２ｂを非連通とし、コアバック動作中はロジック弁２８を開いて型開用油室２ｃと型締用油室２ｂと油タンク２５を連通できるように構成してある。 The mold clamping cylinder 2a is divided into a mold opening oil chamber 2c and a mold clamping oil chamber 2b by a ram 6 for moving the tie bar 7 forward and backward, and further communicates the mold opening oil chamber 2c and the mold clamping oil chamber 2b. There are provided bypass hydraulic pipes 33 and 36, and a logic valve 28 on the bypass hydraulic pipes 33 and 36 for switching between communication / non-communication of the mold opening oil chamber 2c and the mold clamping oil chamber 2b. The oil chamber 2c and the mold clamping oil chamber 2b are disconnected, and the logic valve 28 is opened during the core back operation so that the mold opening oil chamber 2c, the mold clamping oil chamber 2b, and the oil tank 25 can communicate with each other. It is.

射出発泡成形機における型締め、および樹脂射出充填後のコアバック動作と金型内の成形品の発泡膨張工程を説明する。
型締時には型盤開閉手段４０により型閉した後、タイバー固定手段１１によりタイバー７を可動型盤３に固定し、型盤開閉手段４０は可動型盤３に対してフリー状態を保ち、ロジック弁２８を型開用油室２ｃと型締用油室２ｂを非連通に切換え、油圧ポンプ２６と電磁比例制御リリーフ弁２７により発生させた高圧油を４個の油圧シリンダに送って型締めする。 A description will be given of the core clamping operation in the injection foam molding machine, the core back operation after the resin injection filling, and the foam expansion process of the molded product in the mold.
At the time of mold clamping, after the mold is closed by the mold plate opening / closing means 40, the tie bar 7 is fixed to the movable mold board 3 by the tie bar fixing means 11, and the mold plate opening / closing means 40 is kept free with respect to the movable mold board 3, and the logic valve 28, the mold opening oil chamber 2c and the mold clamping oil chamber 2b are switched to the non-communication, and the high pressure oil generated by the hydraulic pump 26 and the electromagnetic proportional control relief valve 27 is sent to the four hydraulic cylinders for mold clamping.

型締め直前あるいは型締め中あるいは型締め後、コアバック装置２０の動作軸部材１２を駆動して、ボールねじナット１３を前進させ、ボールねじナット端面のテーパーフランジ１５を固定型盤２に固設されたストッパー部材１８の端面に当てる。このときテーパーフランジ１５端面がストッパー部材１８の端面に当接する位置を制御プログラムに記憶してあれば、その位置に止めておけば良い。あるいは、型締めによる金型圧縮に伴う固定型盤２と可動型盤３の距離の縮小時に、コアバック装置が共に圧縮され、コアバック装置に過大な負荷が発生しないように、あるいは位置精度に狂いが生じないように、テーパーフランジ１５端面がストッパー部材１８の端面に当接する位置から、型締時の金型圧縮量程度、テーパーフランジ１５の端面を予め後退させた状態で待機させてもよい。 Immediately before or during mold clamping or after mold clamping, the operation shaft member 12 of the core back device 20 is driven to advance the ball screw nut 13, and the taper flange 15 on the end surface of the ball screw nut is fixed to the fixed mold platen 2. It is applied to the end face of the stopper member 18 thus made. At this time, if the position where the end face of the taper flange 15 abuts against the end face of the stopper member 18 is stored in the control program, it may be stopped at that position. Alternatively, when the distance between the fixed mold platen 2 and the movable mold platen 3 is reduced due to mold compression by clamping, the core back device is compressed together so that an excessive load is not generated on the core back device or the positional accuracy is increased. In order not to cause a deviation, the taper flange 15 may be on standby from a position where the end surface of the taper flange 15 abuts against the end surface of the stopper member 18 with the end surface of the taper flange 15 retracted in advance by a mold compression amount at the time of mold clamping. .

この状態で溶融樹脂をキャビティ９内に射出する。射出後、キャビティ９の内面に接する溶融樹脂表面が固化した時点で以下に説明するような発泡寸開膨張行程が行われる。
上記の手順にてテーパーフランジ１５の端面を予め後退させた場合は、型締め終了後の金型の圧縮が復元した後に、テーパーフランジ１５の端面がストッパー部材１８の端面に当接するように、端面を前進させてテーパーフランジ１５端面がストッパー部材１８の端面に当接させた後、そうでない場合は、射出前あるいは射出中あるいは射出後であり、且つテーパーフランジ１５とストッパー部材１８が当接した状態で、連結装置７０のエアシリンダ１６を前進させて割りナット部材１７を閉め、動作軸部材のテーパーフランジ１５のテーパー面１５ａとストッパー部材のテーパーフランジ１８ａが割りナット部材１７のテーパー面に挟まれて型開閉方向に隙間無く連結する。 In this state, molten resin is injected into the cavity 9. After the injection, when the surface of the molten resin in contact with the inner surface of the cavity 9 is solidified, the expansion and expansion process as described below is performed.
When the end face of the taper flange 15 is retracted in advance by the above procedure, the end face is set so that the end face of the taper flange 15 comes into contact with the end face of the stopper member 18 after the mold compression after the completion of mold clamping is restored. The taper flange 15 is brought into contact with the end surface of the stopper member 18, and if not, before, during or after injection, and the taper flange 15 and the stopper member 18 are in contact with each other. Then, the air cylinder 16 of the coupling device 70 is advanced to close the split nut member 17, and the taper surface 15 a of the taper flange 15 of the operation shaft member and the taper flange 18 a of the stopper member are sandwiched between the taper surfaces of the split nut member 17. Connect with no gap in the mold opening and closing direction.

この後、コアバック作動が行われる。制御装置３０に内蔵されたコアバック専用プログラムは、４組のコアバック装置２０の寸開制御の停止目標位置を設定し、各コアバック装置２０のコアバック速度と停止位置を独立に制御する。このとき、４組のコアバック装置２０はそれぞれ制御装置３０により独立に制御されても、又は、同期制御されてもどちらでもよい。また発泡成形品の形状によっては、故意に発泡後の成形品肉厚に差を持たせる、或いは、成形品部位による固化速度に差に対応して発泡状態を均一化するために、寸開の速度や停止位置を均等にしないで、計算又は実測の結果より、各コアバック装置２０毎に、停止目標位置を独立に設定してもよい。 Thereafter, the core back operation is performed. The core back dedicated program built in the control device 30 sets the stop target position of the opening control of the four sets of core back devices 20 and independently controls the core back speed and the stop position of each core back device 20. At this time, the four sets of core back devices 20 may be controlled independently by the control device 30 or may be controlled synchronously. Depending on the shape of the foamed molded product, it may be necessary to deliberately open the molded product in order to make a difference in the thickness of the molded product after foaming, or to make the foamed state uniform according to the difference in the solidification rate of the molded product part. The target stop position may be set independently for each core back device 20 from the result of calculation or actual measurement without equalizing the speed and the stop position.

キャビティ９内の樹脂が発泡膨張し、可動側金型５に型開方向に発泡力Ｆｐがかかる。樹脂の発泡膨張時に、発泡力Ｆｐとコアバックの力Ｆｃを加えた力Ｆｐ＋Ｆｃによって可動型盤３を型開方向に移動する。この可動型盤３の移動とともにタイバー固定手段１１によって可動型盤３に一端を固定されているタイバー７も型開方向に移動する。タイバー７のもう一方の一端に一体となっているラム６が型締シリンダ２ａ内を移動する際に、型締シリンダ２ａの型締用油室２ｂに背圧を生じる。この型締用油室２ｂの圧油はＦｐ＋Ｆｃとバランスをとるように、徐々に抜き、抜けた圧油の分量だけ、ラム６、タイバー７は金型の開側に移動する。 The resin in the cavity 9 expands and expands, and a foaming force Fp is applied to the movable mold 5 in the mold opening direction. During the expansion of the resin, the movable mold platen 3 is moved in the mold opening direction by the force Fp + Fc obtained by adding the foaming force Fp and the core back force Fc. Along with the movement of the movable mold plate 3, the tie bar 7 having one end fixed to the movable mold plate 3 by the tie bar fixing means 11 is also moved in the mold opening direction. When the ram 6 integrated with the other end of the tie bar 7 moves in the mold clamping cylinder 2a, a back pressure is generated in the mold clamping oil chamber 2b of the mold clamping cylinder 2a. The pressure oil in the mold clamping oil chamber 2b is gradually extracted so as to balance Fp + Fc, and the ram 6 and the tie bar 7 are moved to the open side of the mold by the amount of pressure oil that has been removed.

この型締用油室２ｂの背圧がコアバックを安定して制御するためのバックアップ力となるが、型締用油室２ｂの背圧が大きいと、この背圧に対向するコアバック装置２０の駆動力を大きくしなければならないので、電磁比例制御リリーフ弁２７を操作して油圧配管３５に流入する作動油圧を低圧に切換え、ロジック弁２８を操作して油圧配管３７の作動油を型開用油室２ｃに通じるバイパス油圧配管３６に供給することにより、ラム６が型開方向に移動するにともなう型開用油室２ｃが拡大するに伴い発生する型開用油室２ｃ内の負圧を減じ、ラム６の動作抵抗を減らすことによって必要コアバック力を縮減することができる。これによりコアバック装置２０を小型にしてコスト減を図ることができる。
また、型締用油室２ｂの背圧は、Ｆｐ＋Ｆｃとバランスをとるように、徐々に抜くのではなく、コアバック動作の安定制御のために、積極的に一定圧力値に制御してもよい。 The back pressure in the mold clamping oil chamber 2b serves as a backup force for stably controlling the core back. However, if the back pressure in the mold clamping oil chamber 2b is large, the core back device 20 facing the back pressure is used. Therefore, the operating hydraulic pressure flowing into the hydraulic pipe 35 is switched to a low pressure by operating the electromagnetic proportional control relief valve 27, and the hydraulic oil in the hydraulic pipe 37 is opened by operating the logic valve 28. The negative pressure in the mold opening oil chamber 2c generated as the mold opening oil chamber 2c expands as the ram 6 moves in the mold opening direction by supplying the bypass hydraulic pipe 36 leading to the oil chamber 2c. And the required core back force can be reduced by reducing the operating resistance of the ram 6. Thereby, the core back apparatus 20 can be reduced in size and cost reduction can be aimed at.
Further, the back pressure of the mold clamping oil chamber 2b may be positively controlled to a constant pressure value for stable control of the core back operation, instead of gradually releasing it so as to balance Fp + Fc. .

キャビティ９内の樹脂が発泡し、コアバック装置２０の圧力による移動量が発泡樹脂の厚さ（金型寸開量）が所定寸法になる値に到達したら、コアバック装置２０を停止する。このとき、成形品の高外観（高表面転写性）を得るためには、キャビティ内壁に成形品表面が押し付けられた状態を維持できるように、樹脂の膨張力（発泡圧力）が残った状態で金型の間隔を保持し、樹脂を固化させることが好ましい。 When the resin in the cavity 9 is foamed and the amount of movement by the pressure of the core back device 20 reaches a value at which the thickness of the foamed resin (die opening amount) reaches a predetermined dimension, the core back device 20 is stopped. At this time, in order to obtain a high appearance (high surface transferability) of the molded product, in a state where the expansion force (foaming pressure) of the resin remains so that the state where the surface of the molded product is pressed against the cavity inner wall can be maintained. It is preferable to hold the space between the molds and solidify the resin.

薄肉の成形品の場合、コアバック移動量は小さいが、可動側金型５の移動速度は樹脂の発泡膨張速度を超えないように制御することが好ましい。型内圧センサ２９によりキャビティ９内の樹脂圧を計測して、この樹脂圧がマイナスにならぬように、可動側金型５の移動速度、即ち、コアバック装置２０の前進速度を樹脂圧が一定値になるようにフィードバック制御しても良いし、樹脂の発泡膨張速度を予め計算、又は、実測して求めておき、その速度より低い速度になるように制御しても良い。 In the case of a thin molded product, the core back movement amount is small, but it is preferable to control the movement speed of the movable mold 5 so as not to exceed the foam expansion speed of the resin. The resin pressure in the cavity 9 is measured by the mold internal pressure sensor 29, and the movement speed of the movable mold 5, that is, the advance speed of the core back device 20, is constant so that the resin pressure does not become negative. Feedback control may be performed so as to obtain a value, or the foaming expansion speed of the resin may be calculated in advance or obtained by actual measurement, and control may be performed so that the speed becomes lower than that speed.

可動型盤３と固定型盤２を型締めしたとき、コアバック装置２０の連結装置７０を作動させて動作軸部材１２に螺合しているボールねじナット１３のテーパーフランジ１５とストッパー部材１８を隙間無く連結することにより、可動型盤３がコアバック装置２０から離れないので、可動側金型５（可動型盤３）のオーバーランを防止し、あるいは必要によっては可動型盤３を引き戻すことにより、コアバック装置２０の作動と寸開距離を精度良く目標の位置に制御することが容易となり、可動型盤３の位置制御精度および成形品の肉厚精度を向上させることができる。 When the movable mold platen 3 and the fixed mold platen 2 are clamped, the taper flange 15 and the stopper member 18 of the ball screw nut 13 screwed into the operation shaft member 12 by operating the connecting device 70 of the core back device 20 are moved. By connecting without any gap, the movable mold 3 is not separated from the core back device 20, so that the overrun of the movable mold 5 (movable mold 3) is prevented, or the movable mold 3 is pulled back if necessary. Thus, it becomes easy to accurately control the operation and the opening distance of the core back device 20 to the target position, and the position control accuracy of the movable mold platen 3 and the thickness accuracy of the molded product can be improved.

更には、ボールねじナット１３のテーパーフランジ１５とストッパー部材１８の連結動作は、割りナット部材１７の最内径位置がテーパーフランジ１５、およびストッパー部材１８の当接部の最外径位置よりも微少量外側の位置から、テーパー面同士が押し当てられる位置までエアシリンダを小ストローク前進させるだけで良く、且つ連結解放動作は、連結動作とは逆に、割りナット部材１７の最内径位置がテーパーフランジ１５、およびストッパー部材１８の当接部の最外径位置よりも微少量外側に至る程度までエアシリンダを小ストローク後退させるだけでよいので、連結装置の動作時間が短く、成形サイクルを短縮でき、生産性を向上できる。 Further, the connecting operation of the taper flange 15 of the ball screw nut 13 and the stopper member 18 is such that the innermost diameter position of the split nut member 17 is slightly smaller than the outermost diameter position of the contact portion of the taper flange 15 and the stopper member 18. It is only necessary to advance the air cylinder by a small stroke from the outer position to a position where the tapered surfaces are pressed against each other. In the connection release operation, the innermost diameter position of the split nut member 17 is the taper flange 15, contrary to the connection operation. And the air cylinder only needs to be retracted by a small stroke to the outside of the outermost diameter position of the abutting portion of the stopper member 18, so that the operating time of the coupling device is short, the molding cycle can be shortened, and production Can be improved.

また本実施例ではコアバック装置を固定型盤２、可動型盤３の４隅に４組設置した例を示したが、型盤開閉手段４０をコアバック装置と兼用できる場合は、型盤の中心軸に対し型盤開閉手段４０の設置されている位置と反対側に本発明のコアバック装置２０を２組設置してもよいし、型盤の上下あるいは左右の中心線に対し型盤開閉手段４０の設置されている位置と反対側に本発明のコアバック装置２０を２組設置してもよい。またこの場合、型盤開閉手段は電動モータ駆動でなく、油圧駆動（例えば油圧シリンダ）であっても支障ない。 Further, in this embodiment, an example in which four sets of core back devices are installed at the four corners of the stationary mold plate 2 and the movable mold plate 3 is shown. However, if the mold plate opening / closing means 40 can be used also as the core back device, Two sets of the core back device 20 of the present invention may be installed on the side opposite to the position where the mold plate opening / closing means 40 is installed with respect to the central axis. Two sets of the core back device 20 of the present invention may be installed on the side opposite to the position where the means 40 is installed. Further, in this case, there is no problem even if the platen opening / closing means is not an electric motor drive but a hydraulic drive (for example, a hydraulic cylinder).

またコアバック動作が停止し、連結装置７０により可動型盤３の動作を規制し、可動型盤３を停止させようとしても、可動型盤３が停止せずに、動作慣性などにより可動型盤３が移動を続けた場合で、連結装置７０に過度な引っ張り応力が発生し連結装置７０が破損してしまう虞がある場合は、連結装置７０の強度上、発生応力の許容応力を超えないように、何らかの応力リミッタを設けることが好ましい。 Further, when the core back operation is stopped and the operation of the movable platen 3 is restricted by the connecting device 70 and the movable platen 3 is to be stopped, the movable platen 3 is not stopped, but the movable platen is moved by the operation inertia or the like. 3, when the connection device 70 continues to move and excessive tensile stress is generated in the connecting device 70 and the connecting device 70 may be damaged, the allowable stress of the generated stress should not be exceeded due to the strength of the connecting device 70. It is preferable to provide some kind of stress limiter.

［第２の実施の形態］
本実施の形態が第１の実施の形態と異なる点は、コアバック装置２０の動作軸部材１２とストッパー部材１８とを連結する連結装置７０の構成であり、それ以外の構成は同じであり、作用も完全に同じであるので共通部分については説明を省くことにする。 [Second Embodiment]
This embodiment is different from the first embodiment in the configuration of the connecting device 70 that connects the operation shaft member 12 and the stopper member 18 of the core back device 20, and the other configurations are the same. Since the operation is completely the same, the description of the common parts will be omitted.

第２の実施の形態を図に基づいて説明する。図９は図１の射出発泡成形機に取付けた第２の実施形態のコアバック装置の配置を示す上面図、図１０は図９のコアバック装置のＤ部拡大図、図１１は図１０のＥ方向矢視図、図１２は図９のコアバック装置の動作軸部材が移動してストッパー部材に当接した状態を示す側面図、図１３は図９のコアバック装置の動作軸部材とストッパー部材が連結された状態を示す側面図である。 A second embodiment will be described with reference to the drawings. 9 is a top view showing the arrangement of the core back device of the second embodiment attached to the injection foam molding machine of FIG. 1, FIG. 10 is an enlarged view of a D portion of the core back device of FIG. 9, and FIG. FIG. 12 is a side view showing a state in which the operating shaft member of the core back device of FIG. 9 has moved and contacted the stopper member, and FIG. 13 is an operating shaft member and stopper of the core back device of FIG. It is a side view which shows the state in which the member was connected.

図において、コアバック装置５０の第１の実施の形態と同じ可動型盤３に取付け部材４９を介して固設されたボールねじ軸である動作軸部材１２に、第１の実施の形態と同じボールねじナット１３が螺合し、ボールねじナット１３に複数の雌ねじ５１ａを形成したナットフランジ５１が固設されている。このとき複数の雌ねじ５１ａは、同一円周上でも、上下でも、左右でも、ボールねじナット１３の中心軸を挟むように設けることが好ましい。特にボールねじナット１３の中心軸に対し対象に設けることが更に好ましい。ボールねじナット１３、ナットフランジ５１は取付け部材４９に固設された回り止めバー１９により回転を抑えられている。 In the figure, the operation shaft member 12 which is a ball screw shaft fixed to the same movable mold plate 3 as the first embodiment of the core back device 50 via an attachment member 49 is the same as that of the first embodiment. The ball screw nut 13 is screwed, and a nut flange 51 in which a plurality of female screws 51 a are formed is fixed to the ball screw nut 13. At this time, it is preferable that the plurality of female screws 51a are provided so as to sandwich the central axis of the ball screw nut 13 on the same circumference, top and bottom, and left and right. In particular, it is more preferable to provide the object with respect to the central axis of the ball screw nut 13. The rotation of the ball screw nut 13 and the nut flange 51 is suppressed by a detent bar 19 fixed to the mounting member 49.

ストッパー部材５２は固定型盤２に支持板４７を介して固設されており、ストッパー部材５２に固設されたフランジ５２ｂ、５２ｃにねじバー５３が回転自由に支持されている。ねじバー５３はナットフランジ５１のナットの雌ねじ５１ａに対向した位置に設置され、同雌ねじ５１ａに螺合可能な雄ねじ５３ａが形成されている。ねじバー５３は直結したモータ５４により回転駆動することができる。このとき、ねじバー５３は、プーリーや歯車を介してモータ５４と連結させてもよい。モータ５４はねじバー５３と同時に進退移動するが回り止め板５５により回転方向を抑制される。このとき、ねじバー５３をプーリーや歯車を介してモータ５４と連結した場合は、ねじバー５３のみ進退移動させる構造としても良い。ねじバー５３にはフランジ５３ｂが設けられ、ねじバー５３は外周に設けられた圧縮ばね６１により動作軸部材１２の方向に押されている。 The stopper member 52 is fixed to the fixed mold plate 2 via a support plate 47, and a screw bar 53 is rotatably supported by flanges 52b and 52c fixed to the stopper member 52. The screw bar 53 is installed at a position facing the female screw 51a of the nut of the nut flange 51, and a male screw 53a that can be screwed into the female screw 51a is formed. The screw bar 53 can be rotationally driven by a directly connected motor 54. At this time, the screw bar 53 may be connected to the motor 54 via a pulley or a gear. The motor 54 moves forward and backward simultaneously with the screw bar 53, but the rotation direction is suppressed by the rotation stop plate 55. At this time, when the screw bar 53 is connected to the motor 54 via a pulley or a gear, only the screw bar 53 may be moved forward and backward. The screw bar 53 is provided with a flange 53b, and the screw bar 53 is pushed in the direction of the operation shaft member 12 by a compression spring 61 provided on the outer periphery.

コアバック装置５０の動作について説明する。射出発泡成形機における型締め時、動作軸部材１２のボールねじを制御して、ボールねじナット１３を前進させ、ボールねじナット１３の端部に設けられたナットフランジ５１をストッパー部材５２の端面に当接させる。ねじバー５３はナットフランジ５１に押され圧縮ばね６１は縮み、ねじバー５３の先端に押力がかかる。この状態でモータ５４が回転駆動すれば、ねじバー５３の雄ねじ５３ａがナットフランジ５１のナットの雌ねじ５１aにねじ込まれ、動作軸部材１２とストッパー部材５２は連結される。 The operation of the core back device 50 will be described. During mold clamping in the injection foam molding machine, the ball screw of the operation shaft member 12 is controlled to advance the ball screw nut 13, and the nut flange 51 provided at the end of the ball screw nut 13 is attached to the end surface of the stopper member 52. Make contact. The screw bar 53 is pressed by the nut flange 51 and the compression spring 61 contracts, and a pressing force is applied to the tip of the screw bar 53. If the motor 54 is driven to rotate in this state, the male screw 53a of the screw bar 53 is screwed into the female screw 51a of the nut of the nut flange 51, and the operation shaft member 12 and the stopper member 52 are connected.

図示しないが、本実施形態とは異なる構造として、このコアバック装置５０は、ねじバー５３をナットフランジ５１に固設し、ストッパー部材５２側に雌ねじ５１ａを回転自由に支持し、雌ねじ５１ａを駆動するモータ５４とともに設置しても良いし、あるいは、ナットフランジ５１側にねじバー５３を回転自由に支持し、ねじバー５３を回転駆動するモータ５４とともに設置し、雌ねじ５１ａをストッパー部材５２に固設しても良い。 Although not shown, the core back device 50 has a structure different from that of the present embodiment. The core back device 50 has a screw bar 53 fixed to the nut flange 51, supports a female screw 51a on the stopper member 52 side, and rotates the female screw 51a. The screw bar 53 may be rotatably supported on the nut flange 51 side and installed with the motor 54 for rotationally driving the screw bar 53, and the female screw 51a is fixed to the stopper member 52. You may do it.

発泡射出成形工程におけるコアバック装置５０の動作については第１の実施の形態と同様であるので説明は省略する。 Since the operation of the core back device 50 in the foam injection molding process is the same as that of the first embodiment, the description thereof is omitted.

［第３の実施の形態］
本実施の形態が第１及び第２の実施の形態と異なる点は、コアバック装置２０の動作軸部材１２とストッパー部材１８とを連結する連結装置７０の構成であり、それ以外の構成は同じで、作用も完全に同じであるので共通部分については説明を省くことにする。 [Third Embodiment]
The present embodiment is different from the first and second embodiments in the configuration of the connecting device 70 that connects the operation shaft member 12 of the core back device 20 and the stopper member 18, and the other configurations are the same. Since the operation is completely the same, the description of the common parts will be omitted.

第３の実施の形態を図に基づいて説明する。図１４は図１の射出発泡成形機に取付けた第３の実施形態のコアバック装置の配置を示す上面図、図１５は図１４のコアバック装置のＦ部拡大図、図１６は図１５のＧ方向矢視図、図１７は図１５のコアバック装置の動作軸部材が移動してストッパー部材に当接した状態を示す側面図、図１８は図１７のＨ方向矢視図である。 A third embodiment will be described with reference to the drawings. 14 is a top view showing the arrangement of the core back device of the third embodiment attached to the injection foam molding machine of FIG. 1, FIG. 15 is an enlarged view of the F part of the core back device of FIG. 14, and FIG. FIG. 17 is a side view showing a state in which the operation shaft member of the core back device in FIG. 15 has moved and abutted against the stopper member, and FIG. 18 is a view in the H direction arrow of FIG.

図において、コアバック装置６０は、第１の実施の形態と同じ可動型盤３に取付け部材４９を介して固設された動作軸部材１２であるボールねじ軸に、第１の実施の形態と同じボールねじナット１３が螺合し、ボールねじナット１３に固設した磁性体製のフランジ６３と、環状の電磁石６５を取付けた電磁石フランジ６４ａを設けたストッパー部材６４と、電磁石６５を励起する電流をＯＮ、ＯＦＦしてフランジ６３と電磁石フランジ６４ａを連結する図示しない電源と制御装置とよりなり、ボールねじナット１３、フランジ６３は取付け部材４９に固設された回り止めバー１９により回転を抑えられている。 In the figure, the core back device 60 is connected to the ball screw shaft, which is the operation shaft member 12 fixed to the same movable mold platen 3 as the first embodiment via the mounting member 49, with the first embodiment. The same ball screw nut 13 is screwed, a magnetic material flange 63 fixed to the ball screw nut 13, a stopper member 64 provided with an electromagnet flange 64 a to which an annular electromagnet 65 is attached, and an electric current that excites the electromagnet 65. The power supply and the control device (not shown) for connecting the flange 63 and the electromagnet flange 64a by turning ON and OFF are controlled, and the rotation of the ball screw nut 13 and the flange 63 is suppressed by the detent bar 19 fixed to the mounting member 49. ing.

コアバック装置６０は、射出発泡成形機における型締め時、動作軸部材１２のボールねじ軸を回転駆動させてボールねじナット１３を前進させて、ボールねじナット１３の端部に設けられたフランジ６３の端面６３ａをストッパー部材６４の電磁石フランジ６４ａに当接させた後に、電磁石６５に電流を通して動作軸部材１２とストッパー部材６４を磁力連結する。 The core back device 60 rotates the ball screw shaft of the operation shaft member 12 to advance the ball screw nut 13 during mold clamping in the injection foam molding machine, and advances the flange 63 provided at the end of the ball screw nut 13. After the end surface 63a is brought into contact with the electromagnet flange 64a of the stopper member 64, the operation shaft member 12 and the stopper member 64 are magnetically coupled to each other by passing an electric current through the electromagnet 65.

このとき、コアバック装置６０の動作軸部材１２のボールねじナット１３に環状の電磁石６５を取付け、ストッパー部材６４の端部を磁性体製のフランジとした構成としても同様の連結手段が得られる。 At this time, the same connecting means can be obtained even if the annular electromagnet 65 is attached to the ball screw nut 13 of the operating shaft member 12 of the core back device 60 and the end of the stopper member 64 is made of a magnetic flange.

発泡射出成形工程におけるコアバック装置６０の動作については第１の実施の形態と同様であるので説明は省略する。 Since the operation of the core back device 60 in the foam injection molding process is the same as that of the first embodiment, description thereof is omitted.

１基盤
２固定型盤
２ａ型締シリンダ
２ｂ型締用油室
２ｃ型開用油室
３可動型盤
４固定側金型
５可動側金型
６ラム
７タイバー
８射出シリンダ
９キャビティ
１１タイバー固定手段
１２動作軸部材
１３ボールねじナット（進退動作部材）
１４，５１ナットフランジ
１４ａ突き出し部材
１５テーパーフランジ
１５ａテーパー面
１６エアシリンダ
１７割りナット部材
１８ストッパー部材
１８ａテーパーフランジ
１９回り止めバー
２０，５０，６０コアバック装置
２２ボールねじ軸
２３ボールねじナット
２５油タンク
２６油圧ポンプ
２７電磁比例制御リリーフ弁
２８ロジック弁
２９型内圧センサ
３０制御装置
３３バイパス油圧配管
３５油圧配管
３６バイパス油圧配管
３７油圧配管
４０型盤開閉手段
４１支持台
４２支持台
４３コグベルト
４４大コグベルトプーリー
４５小コグベルトプーリー
４６サーボモータ
４７支持板
４８駆動機構
４９取付け部材
５２ストッパー部材
５２ｂフランジ
５２ｃフランジ
５３ねじバー
５３ｂフランジ
５４モータ
５５回り止め板
６１圧縮ばね
６３フランジ
６３ａ端面
６４ストッパー部材
６４ａ電磁石フランジ
６５電磁石
７０連結装置
Ｆｃコアバックの力
Ｆｐ発泡力 DESCRIPTION OF SYMBOLS 1 Base 2 Fixed mold board 2a Mold clamping cylinder 2b Mold clamping oil chamber 2c Mold opening oil chamber 3 Movable mold board 4 Fixed side mold 5 Movable side mold 6 Ram 7 Tie bar 8 Injection cylinder 9 Cavity 11 Tie bar fixing means 12 Operation shaft member 13 Ball screw nut (advance / retreat operation member)
14, 51 Nut flange 14a Protruding member 15 Tapered flange 15a Tapered surface 16 Air cylinder 17 Split nut member 18 Stopper member 18a Taper flange 19 Non-rotating bar 20, 50, 60 Core back device 22 Ball screw shaft 23 Ball screw nut 25 Oil tank 26 Hydraulic pump 27 Electromagnetic proportional control relief valve 28 Logic valve 29 Internal pressure sensor 30 Control device 33 Bypass hydraulic piping 35 Hydraulic piping 36 Bypass hydraulic piping 37 Hydraulic piping 40 Mold plate opening / closing means 41 Support base 42 Support base 43 Cog belt 44 Large cog belt pulley 45 Small cog belt pulley 46 Servo motor 47 Support plate 48 Drive mechanism 49 Mounting member 52 Stopper member 52b Flange 52c Flange 53 Screw bar 53b Flange 54 Motor 55 Anti-rotation plate 6 Force Fp foaming force of the compression spring 63 the flange 63a end face 64 stopper member 64a electromagnet flange 65 electromagnet 70 coupled device Fc core back

Claims

可動型盤と、固定型盤と、両型盤の４隅に型締め用の油圧シリンダと、該油圧シリンダにより型締駆動されるタイバーと、可動型盤を固定型盤から離間する方向に移動させるコアバック装置と、該コアバック装置による前記可動型盤の移動速度、停止位置を制御する制御装置と、を備えた射出発泡成形機であって、
前記コアバック装置が、進退動作部材と、該進退動作部材を型開閉方向に進退動作させる進退駆動部材と、前記進退動作部材が前進して当接するストッパー部材と、前記進退動作部材と前記ストッパー部材が当接後に、前記進退動作部材と前記ストッパー部材を連結する連結装置と、を備えたコアバック装置であり、
前記進退動作部材と前記進退駆動部材は、前記可動型盤又は前記固定型盤のいずれか一方の型盤に固定され、前記ストッパー部材はもう一方の型盤に固定されていることを特徴とする射出発泡成形機。 Movable mold base, fixed mold base, hydraulic cylinders for clamping at the four corners of both mold bases, tie bars driven by the hydraulic cylinders, and movable mold base moving away from the fixed mold base An injection foam molding machine comprising: a core back device to be moved; and a control device for controlling a moving speed and a stop position of the movable mold platen by the core back device,
The core back device includes an advance / retreat operation member, an advance / retreat drive member that causes the advance / retreat operation member to advance / retreat in the mold opening / closing direction, a stopper member that the advance / retreat operation member advances and contacts, the advance / retreat operation member, and the stopper member. Is a core back device provided with a connecting device for connecting the advance / retreat operation member and the stopper member after contact,
The advance / retreat operation member and the advance / retreat drive member are fixed to one of the movable platen and the fixed platen, and the stopper member is fixed to the other platen. Injection foam molding machine.

請求項１に記載する射出発泡成形機において、前記コアバック装置の前記連結装置が、前記ストッパー部材側に備えられたことを特徴とする射出発泡成形機。 The injection foam molding machine according to claim 1, wherein the connecting device of the core back device is provided on the stopper member side.

請求項１に記載する射出発泡成形機において、前記コアバック装置の前記連結装置が、前記進退動作部材側に備えられたことを特徴とする射出発泡成形機。 2. The injection foam molding machine according to claim 1, wherein the connecting device of the core back device is provided on the advancing / retracting member side.

請求項１〜請求項３のいずれか１項に記載する射出発泡成形機において、前記コアバック装置の前記連結装置が割りナット部材と該割りナット部材を開閉する割りナット部材開閉駆動装置を備えたことを特徴とする射出発泡成形機。 The injection foam molding machine according to any one of claims 1 to 3, wherein the connecting device of the core back device includes a split nut member and a split nut member opening / closing drive device for opening and closing the split nut member. An injection foam molding machine characterized by that.

請求項４に記載する射出発泡成形機において、前記コアバック装置の前記進退動作部材および前記ストッパー部材のそれぞれの当接部にフランジ形状を備え、当該フランジ部の前記進退動作部材および前記ストッパー部材のそれぞれの当接面の反対側面に傾斜を設け、前記割りナット部材の内側面に前記進退動作部材および前記ストッパー部材のフランジ部の前記傾斜と対応する傾斜を設けたことを特徴とする射出発泡成形機。 5. The injection foam molding machine according to claim 4, wherein the abutting portions of the advance / retreat operation member and the stopper member of the core back device are provided with flange shapes, and the advance / retreat operation member and the stopper member of the flange portion are provided. An injection foam molding characterized in that an inclination is provided on the opposite side of each abutment surface, and an inclination corresponding to the inclination of the flange portion of the advance / retreat operation member and the stopper member is provided on the inner surface of the split nut member. Machine.

請求項１または請求項２に記載する射出発泡成形機において、前記進退動作部材が端部に雌ねじを形成したナット部材を備えた進退動作部材であり、前記ストッパー部材側に備えられた前記連結装置が、端部に前記ナット部材の雌ねじ形状と対応する雄ねじを有し回転自由に支持されたねじ部材と、該ねじ部材を回転駆動するねじ回転駆動装置を備え、前記ねじ部材の回転により前記進退動作部材と前記ストッパー部材を螺合連結する連結装置であることを特徴とする射出発泡成形機。 The injection foam molding machine according to claim 1 or 2, wherein the advance / retreat operation member is an advance / retreat operation member including a nut member having an internal thread formed at an end thereof, and the connecting device provided on the stopper member side. Comprises a screw member that has a male screw corresponding to the female screw shape of the nut member at its end and is rotatably supported, and a screw rotation driving device that rotationally drives the screw member. An injection foam molding machine comprising a connecting device for screwing and connecting an operating member and the stopper member.

請求項１または請求項２に記載する射出発泡成形機において、前記進退動作部材が端部に雄ねじ部材を設けた進退動作部材であり、前記ストッパー部材側に備えられた前記連結装置が、端部に前記進退動作部材の雄ねじ部材と対応する雌ねじを形成し、該雌ねじを回転自由に支持したナット部材と、前記ナット部材を回転駆動するナット回転駆動装置とを備え、前記ナット部材の回転により前記進退動作部材と前記ストッパー部材を螺合連結する連結装置であることを特徴とする射出発泡成形機。 3. The injection foam molding machine according to claim 1, wherein the advance / retreat operation member is an advance / retreat operation member provided with a male screw member at an end thereof, and the connecting device provided on the stopper member side includes an end portion A female screw corresponding to the male screw member of the advancing / retracting operation member, a nut member that rotatably supports the female screw, and a nut rotation driving device that rotationally drives the nut member, and the rotation of the nut member causes the An injection foam molding machine comprising a connecting device for screwing and connecting an advance / retreat operation member and the stopper member.

請求項１または請求項２に記載する射出発泡成形機において、前記コアバック装置が前記進退動作部材の端部に磁性体製のフランジを備えと、前記ストッパー部材の端部に環状の電磁石を取付けた電磁石フランジを設けたストッパー部材とを備え、適時に前記電磁石に電流を通して前記進退動作部材と前記ストッパー部材を磁力連結するコアバック装置であることを特徴とする射出発泡成形機。 3. The injection foam molding machine according to claim 1, wherein the core back device includes a magnetic flange at an end of the advance / retreat operation member, and an annular electromagnet is attached to the end of the stopper member. And a stopper member provided with an electromagnet flange, and a core back device that magnetically connects the advance / retreat operation member and the stopper member by passing an electric current through the electromagnet at an appropriate time.

請求項１または請求項３に記載する射出発泡成形機において、前記コアバック装置が前記進退動作部材の端部に環状の電磁石を取付けた電磁石フランジを備え、前記ストッパー部材の端部に磁性体製のフランジを備え、適時に前記電磁石に電流を通して前記進退動作部材と前記ストッパー部材を磁力連結するコアバック装置であることを特徴とする射出発泡成形機。 4. The injection foam molding machine according to claim 1, wherein the core back device includes an electromagnet flange having an annular electromagnet attached to an end portion of the advance / retreat operation member, and is made of a magnetic material at an end portion of the stopper member. An injection foam molding machine comprising: a core back device that magnetically connects the advancing / retracting member and the stopper member through a current through the electromagnet at an appropriate time.

請求項１〜請求項９のいずれか１項に記載する射出発泡成形機を用いた射出発泡成形方法であって、
前記型締め用の前記油圧シリンダで型締駆動される前記タイバーにより前記可動型盤と前記固定型盤を型締めし、可動側金型と固定側金型とで形成されたキャビティ内に発泡性樹脂を射出して発泡成形を行うとき、前記コアバック装置の前記進退動作部材を前進させて前記ストッパー部材に当接させるステップと、前記コアバック装置の前記連結装置を作動させて前記進退動作部材と前記ストッパー部材を隙間無く連結するステップと、前記進退動作部材を更に前進させて前記可動型盤を前記固定型盤から離間する方向に所定距離移動させて金型を開くステップと、前記コアバック装置の前記連結装置を作動させて前記進退動作部材と前記ストッパー部材の連結を解くステップと、を含むことを特徴とする射出発泡成形方法。 An injection foam molding method using the injection foam molding machine according to any one of claims 1 to 9,
The movable mold platen and the fixed mold platen are clamped by the tie bar that is clamped and driven by the hydraulic cylinder for mold clamping, and foamable in a cavity formed by the movable side mold and the fixed side mold. A step of advancing the advancing / retreating member of the core back device to abut against the stopper member when performing foam molding by injecting resin; and operating the connecting device of the core back device to operate the advancing / retreating operation member Connecting the stopper member without any gap, opening the mold by moving the movable mold plate a predetermined distance in a direction away from the fixed mold plate by further moving the advance / retreat operation member forward, and the core back And a step of releasing the connection between the advance / retreat operation member and the stopper member by operating the connection device of the apparatus.