JP2005231176A - Method for controlling injection molding machine - Google Patents

Method for controlling injection molding machine Download PDF

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Publication number
JP2005231176A
JP2005231176A JP2004042750A JP2004042750A JP2005231176A JP 2005231176 A JP2005231176 A JP 2005231176A JP 2004042750 A JP2004042750 A JP 2004042750A JP 2004042750 A JP2004042750 A JP 2004042750A JP 2005231176 A JP2005231176 A JP 2005231176A
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injection
mold
cavity
mold clamping
stopper
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Japanese (ja)
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Kazumitsu Omori
和光 大森
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Meiki Seisakusho KK
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Meiki Seisakusho KK
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Priority to JP2004042750A priority Critical patent/JP2005231176A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/5615—Compression stroke, e.g. length thereof

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling an injection molding machine which prevents the change of a prescribed mold opening position even in injection of high injection force in injection compression molding and can obtain a high quality molding. <P>SOLUTION: It is installed between the fixed mold 11 and movable mold 12 of the injection molding machine 47 implementing injection compression molding. After a movable platen 12 is positioned by a stopper 24 which enlarges the volume of the cavity 23 of a mold 45 by a prescribed quantity, when a molten material 44 is injected into the cavity 23, after a mold clamping device 10 is controlled to generate mold clamping force larger than injection force determined by the projected area of the cavity 23 and injection pressure, the molten material 44 in the cavity 23 is compressed by the mold clamping device 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、射出成形機の制御方法に関し、特には射出圧縮成形を実施する射出成形機の制御方法に関する。   The present invention relates to a method for controlling an injection molding machine, and more particularly to a method for controlling an injection molding machine that performs injection compression molding.

射出圧縮成形は、可動金型を固定金型との型合わせ面から所定量開いた位置で位置決めし、容積を拡大させたキャビティへ溶融材料を射出し、その後、可動金型と固定金型を圧締してキャビティ内の溶融材料を圧縮し展延させてキャビティに溶融材料を充填させる成形方法である。   In injection compression molding, the movable mold is positioned at a position that is a predetermined amount away from the mold mating surface with the fixed mold, the molten material is injected into the cavity whose volume has been expanded, and then the movable mold and the fixed mold are assembled. In this molding method, the molten material in the cavity is compressed and compressed and spread to fill the cavity with the molten material.

特許文献１には、前記射出圧縮成形における可動金型（可動盤）の位置決めを位置決め用シリンダ装置で高精度に行う技術が開示されている。しかしながら、特許文献１による可動金型の位置決めは、ブースタラムにより発生する低い出力に基づく力で行われているため、高射出力で溶融材料を射出したときには可動盤は射出力に負けて位置決め位置から開いて、型開き位置が変化してしまう。その結果、容積がより拡大されたキャビティへ射出され厚くなった溶融材料を、所定の成形品厚さまで圧縮・展延させることが困難となる。特に、流動性の低い溶融材料を用いる燃料電池用セパレータの成形ではこの問題は顕著であり、歪みのない均一な板厚のセパレータを成形することが困難であった。
実公昭６１−２７７１３号公報（第１頁〜２頁、図１〜図３） Patent Document 1 discloses a technique for positioning a movable mold (movable platen) in the injection compression molding with high accuracy using a positioning cylinder device. However, since the positioning of the movable mold according to Patent Document 1 is performed with a force based on a low output generated by the booster ram, when the molten material is injected with a high radiation output, the movable plate loses the radiation output and opens from the positioning position. As a result, the mold opening position changes. As a result, it becomes difficult to compress and spread the molten material that has been injected into the cavity having a larger volume and has become thicker to a predetermined molded product thickness. In particular, in the formation of a separator for a fuel cell using a molten material having low fluidity, this problem is remarkable, and it has been difficult to form a separator having a uniform plate thickness without distortion.
Japanese Utility Model Publication No. 61-27713 (pages 1 to 2, FIGS. 1 to 3)

本発明は上記の課題を解決するためになされたものであり、射出圧縮成形において、高射出力の射出であっても所定の型開き位置が変化せず高品質の成形品が得られる射出成形機の制御方法を提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and in injection compression molding, an injection molding machine capable of obtaining a high-quality molded product without changing a predetermined mold opening position even when high-injection-power injection is performed. It is an object to provide a control method.

すなわち、請求項１の発明は、射出圧縮成形を実施する射出成形機の固定盤と可動盤との間に設けられて金型のキャビティの容積を所定量拡大させるストッパにより前記可動盤を位置決めした後、前記キャビティへ溶融材料を射出するとき、前記キャビティの投影面積と射出圧力から規定される射出力より大きな型締力が発生するように型締装置を制御した後、キャビティ内の溶融材料を圧縮することを特徴とする射出成形機の制御方法に係る。   That is, according to the first aspect of the present invention, the movable platen is positioned by a stopper provided between the fixed platen and the movable platen of the injection molding machine for performing the injection compression molding and expanding the volume of the cavity of the mold by a predetermined amount. Thereafter, when injecting the molten material into the cavity, the mold clamping device is controlled so that a mold clamping force larger than the projection power defined by the projected area of the cavity and the injection pressure is generated, and then the molten material in the cavity is removed. The present invention relates to a method for controlling an injection molding machine characterized by compression.

請求項２の発明は、請求項１において、前記ストッパは、油圧シリンダ装置からなり、該油圧シリンダ装置のピストンの前進限度位置で前記可動盤の位置決めを行う射出成形機の制御方法に係る。   The invention of claim 2 relates to a control method for an injection molding machine according to claim 1, wherein the stopper comprises a hydraulic cylinder device, and the movable platen is positioned at a forward limit position of a piston of the hydraulic cylinder device.

請求項３の発明は、請求項２において、前記型締力は、前記射出力に前記油圧シリンダ装置の反抗力を加えた力より小さくなるように制御される射出成形機の制御方法に係る。   A third aspect of the present invention relates to a control method for an injection molding machine according to the second aspect, wherein the mold clamping force is controlled to be smaller than a force obtained by adding a reaction force of the hydraulic cylinder device to the shot output.

請求項１の発明は、射出圧縮成形を実施する射出成形機の固定盤と可動盤との間に設けられて金型のキャビティの容積を所定量拡大させるストッパにより前記可動盤を位置決めした後、前記キャビティへ溶融材料を射出するとき、前記キャビティの投影面積と射出圧力から規定される射出力より大きな型締力が発生するように型締装置を制御した後、キャビティ内の溶融材料を圧縮するので、キャビティの容積を変化させずに圧縮が開始でき高品質の成形品が得られる。   In the invention of claim 1, after positioning the movable platen by a stopper provided between the fixed platen and the movable platen of the injection molding machine for performing the injection compression molding and expanding the volume of the cavity of the mold by a predetermined amount, When the molten material is injected into the cavity, the mold clamping device is controlled so as to generate a mold clamping force larger than the projection power defined by the projected area of the cavity and the injection pressure, and then the molten material in the cavity is compressed. Therefore, compression can be started without changing the volume of the cavity, and a high-quality molded product can be obtained.

請求項２の発明は、前記ストッパは、油圧シリンダ装置からなり、該油圧シリンダ装置のピストンの前進限度位置で前記可動盤の位置決めを行うので、反抗力を効果的に発生させることができる。   According to a second aspect of the present invention, the stopper is composed of a hydraulic cylinder device, and the movable platen is positioned at the forward limit position of the piston of the hydraulic cylinder device, so that a reaction force can be effectively generated.

請求項３の発明は、前記型締力は、前記射出力に前記油圧シリンダ装置の反抗力を加えた力より小さくなるように制御されるので、射出時の可動盤の位置決めを効果的に実行できる。   According to the invention of claim 3, since the mold clamping force is controlled to be smaller than the force obtained by adding the reaction force of the hydraulic cylinder device to the shooting output, positioning of the movable platen at the time of injection is effectively executed. it can.

本発明の実施の形態を図面に基づいて詳細に説明する。図１は本発明を実施する射出成形機を可動盤の位置決め時の状態で示すブロック図、図２は本発明を実施する射出成形機を射出時の状態で示すブロック図、図３は本発明を実施する射出成形機を圧縮時の状態で示すブロック図、図４はストッパの一例を示す拡大断面図、図５は射出時に金型へ作用する力の状態を示す概念図である。   Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an injection molding machine embodying the present invention in a state in which a movable platen is positioned, FIG. 2 is a block diagram showing an injection molding machine embodying the present invention in a state during injection, and FIG. FIG. 4 is an enlarged sectional view showing an example of a stopper, and FIG. 5 is a conceptual diagram showing a state of a force acting on a mold during injection.

図１ないし図３に示すように、射出成形機４７は、型締装置１０、射出装置２５、油圧装置４６および制御装置４３から構成される。射出成形機４７は、射出装置２５においてプラスチック、金属またはセラミック等からなる材料を可塑化して生成した溶融材料４４を型締装置１０の固定金型２０と可動金型２１よりなる金型４５へ射出するものである。   As shown in FIGS. 1 to 3, the injection molding machine 47 includes a mold clamping device 10, an injection device 25, a hydraulic device 46, and a control device 43. The injection molding machine 47 injects a molten material 44 generated by plasticizing a material made of plastic, metal, ceramic, or the like in the injection apparatus 25 into a mold 45 including the fixed mold 20 and the movable mold 21 of the mold clamping apparatus 10. To do.

型締装置１０は、固定盤１１と、取付盤１３と、固定盤１１と取付盤１３との間に架設された複数のタイバ２２と、タイバ２２を摺動して固定盤１１に接近し離隔する可動盤１２と、当該可動盤１２において固定盤１１側の反対側に固着された型締ピストン１６と、型締ピストン１６を往復動可能に嵌挿し取付盤１３に固着された型締シリンダ１４と、ブースタラム１５とから構成される。前記ブースタラム１５は、型締ピストン１６において可動盤１２側と反対側の端面中心部に穿孔された型閉室１９を形成する穴に嵌挿され型締シリンダ１４の底面中心部に固着された中空円筒状である。そして、固定盤１１と可動盤１２の対向面には、金型４５となす固定金型２０と可動金型２１とがそれぞれ取付けられ、可動盤１２の固定盤１１への接近移動によって型合わせされ、キャビティ２３が形成される。   The mold clamping device 10 includes a fixed platen 11, a mounting platen 13, a plurality of tie bars 22 installed between the fixed platen 11 and the mounting platen 13, and slides on the tiebars 22 to approach the fixed platen 11 and separate them. The movable platen 12, the mold clamping piston 16 fixed to the opposite side of the fixed platen 11 in the movable platen 12, and the mold clamping cylinder 14 fixedly attached to the mounting plate 13 by inserting the mold clamping piston 16 so as to reciprocate. And a booster ram 15. The booster ram 15 is inserted into a hole forming a mold closing chamber 19 perforated in the center of the end surface of the mold clamping piston 16 opposite to the movable platen 12 side, and is fixed to the center of the bottom surface of the mold clamping cylinder 14. Is. A fixed mold 20 and a movable mold 21 are attached to the opposing surfaces of the fixed platen 11 and the movable platen 12, respectively, and are matched by moving the movable platen 12 toward the fixed platen 11. A cavity 23 is formed.

金型４５が取付けられた固定盤１１と可動盤１２の対向面のいずれかの面には、複数のストッパ２４が取付けられる。ストッパ２４は、図４に示すように、固定盤１１と可動盤１２の対向面のいずれかの面に取付けられる取付板５０と、取付板５０に液圧密に固着されるストッパシリンダ５１と、ストッパシリンダ５１に往復動自在に嵌挿されるストッパピストン５２と、ストッパピストン５２において取付板５０側と反対側に固着されるロッド５３と、ロッド５３の中心穴に螺刻された雌螺子に螺合する調整螺子５５と、調整螺子５５の緩みを防止するロックナット５４とからなる。ストッパシリンダ５１におけるストッパピストン５２の取付板５０側はストッパ室５６が形成される。ストッパ室５６に供給される圧油によりストッパピストン５２はストッパシリンダ５１の端面５７に押圧されて、可動盤１２の衝止が実行される。図示の実施例によると、取付板５０は固定盤１１に取付けられている。なお、ストッパ２４は油圧シリンダ装置からなり、該装置のピストンとはストッパピストン５２に相当する。   A plurality of stoppers 24 are attached to one of the opposing surfaces of the fixed platen 11 and the movable platen 12 to which the mold 45 is attached. As shown in FIG. 4, the stopper 24 includes a mounting plate 50 that is attached to one of the opposing surfaces of the fixed platen 11 and the movable platen 12, a stopper cylinder 51 that is liquid-tightly fixed to the mounting plate 50, and a stopper A stopper piston 52 that is removably inserted into the cylinder 51, a rod 53 that is fixed to the stopper piston 52 on the opposite side of the mounting plate 50, and a female screw that is screwed into the center hole of the rod 53. The adjustment screw 55 includes a lock nut 54 that prevents the adjustment screw 55 from loosening. A stopper chamber 56 is formed on the stopper cylinder 51 on the mounting plate 50 side of the stopper piston 52. The stopper piston 52 is pressed against the end surface 57 of the stopper cylinder 51 by the pressure oil supplied to the stopper chamber 56, and the movable platen 12 is stopped. According to the illustrated embodiment, the mounting plate 50 is attached to the stationary platen 11. The stopper 24 includes a hydraulic cylinder device, and the piston of the device corresponds to the stopper piston 52.

射出装置２５は、加熱筒２６と、加熱筒２６に回転往復動可能に嵌挿されたスクリュ２７と、加熱筒２６の先端面に螺着され固定金型２０に当接するノズル２８と、スクリュ２７を往復駆動する射出シリンダ２９と、スクリュ２７を回転駆動するモータ３１とからなる。加熱筒２６の後部から供給された成形材料は、スクリュ２７により前方に搬送されつつ、加熱筒２６の外周に捲着された図示しないヒータにより溶融されて可塑化される。そして、可塑化された成形材料は、加熱筒２６内のスクリュ２７前方に、キャビティ２３の容積に応じた所定量が溶融材料４４として蓄積される。   The injection device 25 includes a heating cylinder 26, a screw 27 that is rotatably fitted in the heating cylinder 26, a nozzle 28 that is screwed onto the front end surface of the heating cylinder 26 and abuts against the fixed mold 20, and the screw 27. Is composed of an injection cylinder 29 that reciprocally drives the motor 27 and a motor 31 that rotationally drives the screw 27. The molding material supplied from the rear part of the heating cylinder 26 is melted and plasticized by a heater (not shown) attached to the outer periphery of the heating cylinder 26 while being conveyed forward by the screw 27. A predetermined amount of the plasticized molding material corresponding to the volume of the cavity 23 is accumulated as the molten material 44 in front of the screw 27 in the heating cylinder 26.

油圧装置４６は、型締装置１０や射出装置２５のアクチュエータを油圧駆動するための機器である。ポンプ３７は、タンク３８に貯留された作動油を汲み上げて加圧し圧油となす。切換弁３６は、ポンプ３７の圧油を、タンク３８へ戻すニュートラル位置、型閉室１９と型締室１８へ供給する位置、または型開室１７へ供給する位置のいずれかを択一的に切り換え、可動盤１２を開閉制御する。切換弁３４は、切換弁３６が圧油を型閉室１７と型締室１８へ供給する位置に切り換えられているとき、圧油を型閉室１９に加えて型締室１８にも供給してより大きな型締力を発生可能にする。逆止弁３３は、型締室１８に供給された圧油の逆流を防止するとともに、切換弁３６が圧油を型開室１７へ供給する位置に切り換えられたときには強制的に逆止が解除されて型締室１８の圧油をタンク３８へ戻すように作動する。   The hydraulic device 46 is a device for hydraulically driving the actuators of the mold clamping device 10 and the injection device 25. The pump 37 pumps up the hydraulic oil stored in the tank 38, pressurizes it, and uses it as pressure oil. The switching valve 36 selectively switches between a neutral position for returning the pressure oil of the pump 37 to the tank 38, a position for supplying the pressure oil to the mold closing chamber 19 and the mold clamping chamber 18, and a position for supplying the pressure oil to the mold opening chamber 17. The movable platen 12 is controlled to open and close. When the switching valve 36 is switched to the position where the pressure oil is supplied to the mold closing chamber 17 and the mold clamping chamber 18, the switching valve 34 supplies the pressure oil to the mold clamping chamber 18 in addition to the mold closing chamber 19. A large mold clamping force can be generated. The check valve 33 prevents the backflow of the pressure oil supplied to the mold clamping chamber 18 and forcibly releases the check when the switching valve 36 is switched to a position where the pressure oil is supplied to the mold opening chamber 17. Then, the pressure oil in the mold clamping chamber 18 is operated to return to the tank 38.

切換弁３５は、切換弁３６が圧油を型閉室１９と型締室１８へ供給する位置に切り換えられているとき、圧油を複数のストッパ２４のストッパ室５６（図４参照）に供給可能にして、ストッパ２４、特にはストッパピストン５２が前進限度位置に達したときに、固定盤１１と可動盤１２とを所定間隔で衝止させ、可動盤１２の位置決めを行う。電磁リリーフ弁３９は、切換弁３６が圧油を型閉室１９と型締室１８へ供給する位置に切り換えられているとき、その圧油の油圧力を制御装置４３からの駆動電流によって自在に制御する。そのため、電磁リリーフ弁３９は、型締装置１０の型閉室１９、型締室１８およびストッパ室５６の油圧力を制御可能であり、ブースタラム１５の受圧面積Ａと型締ピストン１６の受圧面積Ｂで定まる型締力を制御することができるとともに、複数のストッパピストン５２の受圧面積Ｃの総計で定まる反抗力も制御することができる。なお、切換弁３５は、ポンプ３７と電磁リリーフ弁３９とによる油圧源とは別に設けたポンプと電磁リリーフ弁に接続されることにより、反抗力を型締力とは関係なく単独に制御するように構成してもよい。   The switching valve 35 can supply pressure oil to the stopper chambers 56 (see FIG. 4) of the plurality of stoppers 24 when the switching valve 36 is switched to a position where the pressure oil is supplied to the mold closing chamber 19 and the mold clamping chamber 18. Thus, when the stopper 24, in particular, the stopper piston 52 reaches the forward limit position, the fixed platen 11 and the movable platen 12 are stopped at a predetermined interval, and the movable platen 12 is positioned. When the switching valve 36 is switched to a position where the pressure oil is supplied to the mold closing chamber 19 and the mold clamping chamber 18, the electromagnetic relief valve 39 freely controls the oil pressure of the pressure oil by a drive current from the control device 43. To do. Therefore, the electromagnetic relief valve 39 can control the hydraulic pressure in the mold closing chamber 19, the mold clamping chamber 18, and the stopper chamber 56 of the mold clamping device 10, and is based on the pressure receiving area A of the booster ram 15 and the pressure receiving area B of the mold clamping piston 16. The fixed mold clamping force can be controlled, and the reaction force determined by the total pressure receiving area C of the plurality of stopper pistons 52 can also be controlled. The switching valve 35 is connected to a pump and an electromagnetic relief valve provided separately from the hydraulic pressure source by the pump 37 and the electromagnetic relief valve 39, so that the reaction force is controlled independently of the mold clamping force. You may comprise.

切換弁４０は、ポンプ４１の圧油を、タンク３８へ戻すニュートラル位置、射出室４８へ供給する位置、または後退室４９へ供給する位置のいずれかを択一的に切り換え、スクリュ２７を前進または後退させて射出および可塑化の制御を行う。圧力センサ４２は、射出室４８へ圧油を供給する管路に設けられ、射出室４８の油圧力を検出して制御装置４３へその信号を伝送する。   The switching valve 40 selectively switches between a neutral position where the pressure oil of the pump 41 is returned to the tank 38, a position where the pressure oil is supplied to the injection chamber 48, and a position where the pressure oil is supplied to the retreat chamber 49. Retract and control injection and plasticization. The pressure sensor 42 is provided in a pipeline that supplies pressure oil to the injection chamber 48, detects the oil pressure in the injection chamber 48, and transmits the signal to the control device 43.

制御装置４３は、マイクロプロセッサに基づいて構成されたプログラマブルなものであり、中央演算処理装置としてのＣＰＵと、成形条件等を設定入力・表示する操作部と、設定値、定数およびプログラムを格納するＲＡＭ・ＲＯＭ等の記憶部と、圧力センサ４２や各種手動スイッチ等に接続される入力部と、切換弁３４，３５，３６，４０および電磁リリーフ弁３９への駆動電流やヒータへの駆動電流を出力する出力部とからなる。制御装置４３は、射出成形機４７の型締装置１０や射出装置２５等のアクチュエータをシーケンス制御しそれらの速度や力を制御する他、加熱筒２６のヒータの温度制御を行う。図中、各切換弁と制御装置４３との信号線は省略されている。   The control device 43 is a programmable device configured based on a microprocessor, and stores a CPU as a central processing unit, an operation unit for setting and inputting molding conditions and the like, setting values, constants, and programs. A drive unit for a storage unit such as a RAM / ROM, an input unit connected to the pressure sensor 42 and various manual switches, a switching valve 34, 35, 36, 40, and an electromagnetic relief valve 39, and a driving current for a heater. And an output unit for outputting. The control device 43 performs sequence control of actuators such as the mold clamping device 10 and the injection device 25 of the injection molding machine 47 to control their speed and force, and also controls the temperature of the heater of the heating cylinder 26. In the figure, signal lines between the switching valves and the control device 43 are omitted.

次に、射出成形機４７における射出圧縮成形の制御方法について詳細に説明する。図１に示すように、制御装置４３は、切換弁３６および切換弁３５のソレノイドを励磁し、ブースタラム１５を介して型閉室１９に圧油を供給し可動盤１２を固定盤１１に接近させるとともに、ストッパ室５６に圧油を供給してストッパ２４を限度位置まで伸長させておく。可動金型２１が固定金型２０に係合して所定の圧縮代を残す位置まで到達したとき、可動盤１２の固定盤１１との対向面にストッパ２４の突出量が調整された調整螺子５５が当接する。すなわち、ストッパピストン５２の前進限度位置で可動盤１２と調整螺子５５が当接することにより位置決めが行われる。このとき、ブースタラム１５の受圧面積Ａは、複数のストッパピストン５２の受圧面積Ｃの総計よりも小さくなるように設計されているかまたは、ストッパ室５６の油圧力が型閉室１９の油圧力より十分高く制御されているので、電磁リリーフ弁３９の設定油圧力の如何に関わらず、ブースタラム１５のみによる型締力はストッパ２４の反抗力より小さくなる。そのため、ストッパ２４のストッパピストン５２は端面５７に当接して保持するので、可動盤１２は、ストッパピストン５２が前進限度位置まで伸長したストッパ２４により精確かつ安定して位置決めされる。   Next, the injection compression molding control method in the injection molding machine 47 will be described in detail. As shown in FIG. 1, the control device 43 excites the solenoids of the switching valve 36 and the switching valve 35, supplies pressure oil to the mold closing chamber 19 via the booster ram 15, and moves the movable platen 12 closer to the fixed platen 11. Then, pressure oil is supplied to the stopper chamber 56 to extend the stopper 24 to the limit position. When the movable die 21 is engaged with the fixed die 20 and reaches a position where a predetermined compression allowance is left, an adjustment screw 55 in which the protruding amount of the stopper 24 is adjusted to the surface of the movable plate 12 facing the fixed platen 11 is adjusted. Abut. That is, the positioning is performed by bringing the movable platen 12 and the adjusting screw 55 into contact at the forward limit position of the stopper piston 52. At this time, the pressure receiving area A of the booster ram 15 is designed to be smaller than the sum of the pressure receiving areas C of the plurality of stopper pistons 52 or the oil pressure in the stopper chamber 56 is sufficiently higher than the oil pressure in the mold closing chamber 19. Since the pressure is controlled, the mold clamping force only by the booster ram 15 becomes smaller than the reaction force of the stopper 24 regardless of the set oil pressure of the electromagnetic relief valve 39. Therefore, since the stopper piston 52 of the stopper 24 is held in contact with the end surface 57, the movable platen 12 is accurately and stably positioned by the stopper 24 in which the stopper piston 52 extends to the advance limit position.

その後、図２に示すように、固定金型２０に当接した射出装置２５から溶融材料４４がキャビティ２３へ射出される。これは、切換弁４０のソレノイドが励磁され、射出ピストン３０の射出室４８へ圧油が供給されて行われる。それと同時に、切換弁３４のソレノイドも励磁され、圧油は型締室１８へも供給される。   Thereafter, as shown in FIG. 2, the molten material 44 is injected into the cavity 23 from the injection device 25 in contact with the fixed mold 20. This is done by exciting the solenoid of the switching valve 40 and supplying pressure oil to the injection chamber 48 of the injection piston 30. At the same time, the solenoid of the switching valve 34 is also excited, and the pressure oil is supplied to the mold clamping chamber 18.

射出装置２５からキャビティ２３へ溶融材料４４が射出されるとき、可動金型２１すなわち可動盤１２が固定盤１１に対して受ける力は、図５中の矢印として示すように、型締力（Ｐ2）、射出力（Ｐ1）および反抗力（Ｐ3）である。型締力（Ｐ2）は、ブースタラム１５の受圧面積Ａと型締ピストン１６の受圧面積Ｂの加算値に、電磁リリーフ弁３９で制御された圧油の油圧値を乗じたものである。射出力（Ｐ1）は、型締力の作用する方向に垂直な面であるキャビティ２３の投影面積に、圧力センサ４２の検出値に基づいて求められる溶融材料４４の射出圧力を乗じたものである。また、反抗力（Ｐ3）は、複数のストッパピストン５２の受圧面積Ｃの総計に、電磁リリーフ弁３９で制御された圧油の油圧値を乗じたものである。 When the molten material 44 is injected from the injection device 25 into the cavity 23, the force that the movable mold 21, that is, the movable platen 12 receives against the fixed platen 11 is the mold clamping force (P 2 ), firing power (P 1 ) and reaction force (P 3 ). The mold clamping force (P 2 ) is obtained by multiplying the sum of the pressure receiving area A of the booster ram 15 and the pressure receiving area B of the mold clamping piston 16 by the hydraulic pressure value of the pressure oil controlled by the electromagnetic relief valve 39. The shot power (P 1 ) is obtained by multiplying the projected area of the cavity 23, which is a plane perpendicular to the direction in which the mold clamping force acts, by the injection pressure of the molten material 44 obtained based on the detection value of the pressure sensor 42. is there. The reaction force (P 3 ) is obtained by multiplying the total pressure receiving area C of the plurality of stopper pistons 52 by the hydraulic pressure value of the pressure oil controlled by the electromagnetic relief valve 39.

射出装置２５からキャビティ２３へ溶融材料４４が射出されるとき、可動盤１２がその位置決め位置を保持できるための条件は、図５に示すように、型締力（Ｐ2）が射出力（Ｐ1）より大であり、かつ、射出力（Ｐ1）と反抗力（Ｐ3）の加算値が型締力（Ｐ2）より大であることである。つまり、｛Ｐ1＜Ｐ2＜（Ｐ1＋Ｐ3）｝とする関係式が成立することである。なお、反抗力と型締力とを比較すると、それぞれの受圧面積の設計上、反抗力は型締力の１０〜２０％程度であり、この反抗力が前記したように型締力の制御許容範囲となる。したがって、型締力の制御を容易にするためには、反抗力を可及的に大きくする必要がある。そのため、ストッパピストン５２の受圧面積Ｃを大きくするか、前記したようにストッパピストン５２の油圧源をポンプ３７と電磁リリーフ弁３９による回路から切り離して単独のものとし、ストッパピストン５２に型締力とは関係のない高い油圧力が供給されるようにすることが好ましい。 When the molten material 44 is injected from the injection device 25 into the cavity 23, the condition for the movable platen 12 to be able to maintain its positioning position is that the mold clamping force (P 2 ) is the injection power (P 2 ) as shown in FIG. 1) from a large, and is that the sum of the injection force (P 1) and resistance force (P 3) is larger than the clamping force (P 2). That is, the relational expression {P 1 <P 2 <(P 1 + P 3 )} holds. When the reaction force and the mold clamping force are compared, the reaction force is about 10 to 20% of the mold clamping force due to the design of each pressure receiving area, and the reaction force is allowed to control the mold clamping force as described above. It becomes a range. Therefore, in order to facilitate the control of the mold clamping force, it is necessary to increase the reaction force as much as possible. Therefore, the pressure receiving area C of the stopper piston 52 is increased, or the hydraulic pressure source of the stopper piston 52 is separated from the circuit of the pump 37 and the electromagnetic relief valve 39 as described above, and the stopper piston 52 is separated from the circuit. It is preferable to supply a high irrelevant oil pressure.

制御装置４３は、射出装置２５からキャビティ２３へ溶融材料４４が射出されるとき、型締力が上記条件となるように、電磁リリーフ弁３９を制御する。具体的には、制御装置４３は、その操作部で入力設定されたキャビティ２３の投影面積に圧力センサ４２で検出した射出圧力を乗算して射出力を求める。ブースタラム１５の受圧面積Ａ、型締ピストン１６の受圧面積Ｂおよび、複数のストッパピストン５２の受圧面積Ｃの総計は、射出成形機４７に固有の値であり、予め制御装置４３の記憶部に格納されている。また、電磁リリーフ弁３９で制御された圧油の油圧値は、制御装置４３の操作部を介して記憶部に格納されているその設定値を用いるか、電磁リリーフ弁３９の管路に別途設けた圧力センサにより検出して求めてもよい。上記のようにして求めた値により、制御装置４３は、型締力と反抗力も演算することができる。そして、制御装置４３は、求めた射出力、型締力および反抗力を比較演算して、型締力が前出の関係式を満足するように電磁リリーフ弁３９を制御する。   The control device 43 controls the electromagnetic relief valve 39 so that the mold clamping force satisfies the above condition when the molten material 44 is injected from the injection device 25 into the cavity 23. Specifically, the control device 43 multiplies the projected area of the cavity 23 input and set by the operation unit by the injection pressure detected by the pressure sensor 42, and obtains a fire output. The total of the pressure receiving area A of the booster ram 15, the pressure receiving area B of the clamping piston 16, and the pressure receiving areas C of the plurality of stopper pistons 52 is a value unique to the injection molding machine 47 and is stored in advance in the storage unit of the control device 43. Has been. Further, the hydraulic pressure value of the pressure oil controlled by the electromagnetic relief valve 39 uses the set value stored in the storage unit via the operation unit of the control device 43 or is provided separately in the conduit of the electromagnetic relief valve 39. It may be obtained by detecting with a pressure sensor. The control device 43 can also calculate the mold clamping force and the reaction force based on the values obtained as described above. Then, the control device 43 compares and calculates the calculated radiant power, mold clamping force, and reaction force, and controls the electromagnetic relief valve 39 so that the mold clamping force satisfies the above-described relational expression.

型締力は、上記のように、変数である射出圧力に基づいて演算され制御されるので、射出力の変化に対して数十ミリ秒の遅れが生ずる。この遅れが問題となるような高速の射出を行う場合は、電磁リリーフ弁３９をサーボ弁に代えることが好ましい。また他の方法として、一旦射出圧力の挙動パターンを記憶部に記憶させておき、射出の開始時に、射出の開始より略作動遅れに相当する時間先立って、型締力を前記記憶させた射出圧力パターンに基づいて制御することがより好ましい。   As described above, the mold clamping force is calculated and controlled based on the variable injection pressure, and therefore, a delay of several tens of milliseconds occurs with respect to the change in the injection power. When performing high-speed injection in which this delay becomes a problem, it is preferable to replace the electromagnetic relief valve 39 with a servo valve. As another method, the behavior pattern of the injection pressure is once stored in the storage unit, and the injection pressure in which the mold clamping force is stored at the time of the start of the injection is preceded by a time corresponding to a substantially operation delay from the start of the injection. It is more preferable to control based on the pattern.

射出装置２５からキャビティ２３へ溶融材料４４が射出された後、図３に示すように、型締装置１０は溶融材料４４の圧縮を行う。これは、図２に示す射出時の状態に加えて、切換弁３５のソレノイドを解磁してストッパ２４の反抗力を解除した状態で行われる。さらにこのとき、射出圧力は、図示しない油圧調整機構により保持圧力に切り換えられ、キャビティ２３内の溶融材料４４が圧縮により射出装置２５側へ逆流するのを防止する。溶融材料４４の逆流は、ノズル２８部分に設ける開閉弁で行うこともある。キャビティ２３内の溶融材料４４の圧縮は、制御装置４３が電磁リリーフ弁３９を介して型締力を制御することにより行われる。   After the molten material 44 is injected from the injection device 25 into the cavity 23, the mold clamping device 10 compresses the molten material 44 as shown in FIG. This is performed in a state where the solenoid of the switching valve 35 is demagnetized to release the reaction force of the stopper 24 in addition to the state at the time of injection shown in FIG. Further, at this time, the injection pressure is switched to a holding pressure by a hydraulic pressure adjusting mechanism (not shown), and the molten material 44 in the cavity 23 is prevented from flowing back to the injection device 25 side due to compression. The reverse flow of the molten material 44 may be performed by an on-off valve provided in the nozzle 28 portion. The molten material 44 in the cavity 23 is compressed by the control device 43 controlling the mold clamping force via the electromagnetic relief valve 39.

このようにして、本発明の射出圧縮成形によれば、射出装置２５からキャビティ２３へ溶融材料４４が射出されるとき、可動盤１２はストッパ２４の位置決め位置（ストッパピストン５２の前進限度位置）に停止するように型締力が制御されるので、キャビティ２３の容積を変化させずに溶融材料４４の圧縮を開始させることができ、流動性の悪い溶融材料を用いた薄肉の成形品であっても歪みや板厚の変化がない高品質の成形品が得られる。   Thus, according to the injection compression molding of the present invention, when the molten material 44 is injected from the injection device 25 into the cavity 23, the movable platen 12 is brought to the positioning position of the stopper 24 (the advance limit position of the stopper piston 52). Since the mold clamping force is controlled so as to stop, the compression of the molten material 44 can be started without changing the volume of the cavity 23, and the thin molded product using the molten material having poor fluidity is provided. High quality molded products without distortion and plate thickness change can be obtained.

なお、本発明は、当業者の知識に基づいて様々な変更、修正、改良等を加えた態様において実施され得るものを含む。また、前記変更等を加えた実施態様が、本発明の趣旨を逸脱しない限りいずれも本発明の範囲内に含まれるものであることは言うまでもない。例えば、型締装置１０は油圧方式のもので説明したが、型締力が本発明のように制御できるものであれば、サーボモータとボール螺子等による機械方式のものでもよい。   In addition, this invention includes what can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art. Further, it goes without saying that any of the embodiments to which the above-mentioned changes are added is included in the scope of the present invention without departing from the gist of the present invention. For example, although the mold clamping device 10 has been described as a hydraulic system, a mechanical system using a servo motor and a ball screw may be used as long as the mold clamping force can be controlled as in the present invention.

また、実施例においてはストッパとして油圧シリンダ装置を用いたもので説明したが、そのストッパ２４に代えて、ブロック状の部材を固定盤１１と可動盤１２との間に挿脱するようにしてもよい。その場合は、本発明の課題を解決する条件としては、型締力が射出力より大であるというもののみとなる。そして、型締力は射出力に基づいて演算し制御するのではなく、射出力の最高値より大きい一定の型締力が生成されるように予め設定して制御してもよい。   In the embodiment, the hydraulic cylinder device is used as a stopper. However, instead of the stopper 24, a block-like member may be inserted and removed between the fixed platen 11 and the movable platen 12. Good. In that case, the only condition for solving the problem of the present invention is that the mold clamping force is greater than the firing force. The mold clamping force is not calculated and controlled based on the shot output, but may be set and controlled in advance so that a fixed mold force larger than the maximum value of the shot output is generated.

本発明を実施する射出成形機を可動盤の位置決め時の状態で示すブロック図である。It is a block diagram which shows the injection molding machine which implements this invention in the state at the time of positioning of a movable board. 本発明を実施する射出成形機を射出時の状態で示すブロック図である。It is a block diagram which shows the injection molding machine which implements this invention in the state at the time of injection. 本発明を実施する射出成形機を圧縮時の状態で示すブロック図である。It is a block diagram which shows the injection molding machine which implements this invention in the state at the time of compression. ストッパの一例を示す拡大断面図である。It is an expanded sectional view showing an example of a stopper. 射出時に金型へ作用する力の状態を示す概念図である。It is a conceptual diagram which shows the state of the force which acts on a metal mold | die at the time of injection.

符号の説明Explanation of symbols

１０ 型締装置
１１ 固定盤
１２ 可動盤
２３ キャビティ
２４ ストッパ
２５ 射出装置
４３ 制御装置
４４ 溶融材料
４５ 金型
４７ 射出成形機
５２ ストッパピストン DESCRIPTION OF SYMBOLS 10 Clamping device 11 Fixed platen 12 Movable platen 23 Cavity 24 Stopper 25 Injection device 43 Control device 44 Molten material 45 Mold 47 Injection molding machine 52 Stopper piston

Claims (3)

射出圧縮成形を実施する射出成形機の固定盤と可動盤との間に設けられて金型のキャビティの容積を所定量拡大させるストッパにより前記可動盤を位置決めした後、前記キャビティへ溶融材料を射出するとき、前記キャビティの投影面積と射出圧力から規定される射出力より大きな型締力が発生するように型締装置を制御した後、キャビティ内の溶融材料を圧縮することを特徴とする射出成形機の制御方法。   The movable platen is positioned between a fixed platen and a movable platen of an injection molding machine that performs injection compression molding and expands the volume of the cavity of the mold by a predetermined amount, and then the molten material is injected into the cavity. Injection molding, wherein a mold clamping device is controlled to generate a larger clamping force than a projected power defined by a projected area of the cavity and an injection pressure, and then the molten material in the cavity is compressed. How to control the machine. 前記ストッパは、油圧シリンダ装置からなり、該油圧シリンダ装置のピストンの前進限度位置で前記可動盤の位置決めを行う請求項１に記載の射出成形機の制御方法。   The control method for an injection molding machine according to claim 1, wherein the stopper is composed of a hydraulic cylinder device, and the movable platen is positioned at a forward limit position of a piston of the hydraulic cylinder device. 前記型締力は、前記射出力に前記油圧シリンダ装置の反抗力を加えた力より小さくなるように制御される請求項２に記載の射出成形機の制御方法。   The method of controlling an injection molding machine according to claim 2, wherein the mold clamping force is controlled to be smaller than a force obtained by adding a reaction force of the hydraulic cylinder device to the shot output.
JP2004042750A 2004-02-19 2004-02-19 Method for controlling injection molding machine Pending JP2005231176A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1034658C2 (en) * 2007-11-08 2009-05-11 Green Invest Bvba Injection molding method and injection molding device.
CN103612368A (en) * 2013-11-28 2014-03-05 广州市香港科大***研究院 Automatic-locking and automatic-pressure-maintaining injection mold
CN106671375A (en) * 2016-12-13 2017-05-17 东莞富强鑫塑胶机械制造有限公司 Method for shortening injection molding period

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1034658C2 (en) * 2007-11-08 2009-05-11 Green Invest Bvba Injection molding method and injection molding device.
WO2009061200A3 (en) * 2007-11-08 2009-06-25 Green Invest Bvba Injection molding method and injection molding apparatus
CN103612368A (en) * 2013-11-28 2014-03-05 广州市香港科大***研究院 Automatic-locking and automatic-pressure-maintaining injection mold
CN103612368B (en) * 2013-11-28 2016-01-27 广州市香港科大***研究院 A kind of self-locking self-insurance pressure injection mould
CN106671375A (en) * 2016-12-13 2017-05-17 东莞富强鑫塑胶机械制造有限公司 Method for shortening injection molding period

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