JP2017087526A - Injection molding machine and control method of injection molding machine - Google Patents

Injection molding machine and control method of injection molding machine Download PDF

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JP2017087526A
JP2017087526A JP2015219344A JP2015219344A JP2017087526A JP 2017087526 A JP2017087526 A JP 2017087526A JP 2015219344 A JP2015219344 A JP 2015219344A JP 2015219344 A JP2015219344 A JP 2015219344A JP 2017087526 A JP2017087526 A JP 2017087526A
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mold
closing
injection molding
molding machine
mold thickness
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JP6188250B2 (en
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弘幸 樫内
Hiroyuki Kashiuchi
弘幸 樫内
一実 朝野
Kazumi Asano
一実 朝野
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Meiki Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine in which two or more molding dies are successively provided in a mold opening and closing direction and mold thickness size can be set to an appropriate value.SOLUTION: An injection molding machine 11 in which two or more molding dies A and B are successively provided in a mold opening and closing direction, comprises: mold thickness measuring means 26 and 27 measuring mold thickness dimensions of respective molding dies directly or indirectly; mold thickness correction means 43 which can correct individually the mold thickness dimensions t1 and t2 of the respective molding dies A and B measured by the mold thickness measuring means 26 and 27; and storing means 44 storing the corrected mold thickness dimensions t1a and t2b.SELECTED DRAWING: Figure 1

Description

本発明は、射出成形機および射出成形機の制御方法に関するものである。 The present invention relates to an injection molding machine and a method for controlling an injection molding machine.
射出成形機において成形金型が交換される際には成形金型の型厚寸法が測定され、測定された記型厚寸法は記憶手段に記憶され、成形中の射出成形機の型開閉制御等に用いられる。しかしながら射出成形機による成形時間が長くなるにつれて成形金型が昇温されて熱膨張するため予め測定した型厚寸法から誤差を生じる。そのため特許文献1のように型位置検出手段によって検出された可動型の位置に基づいて、型厚記憶手段に記憶された型厚寸法を補正する型厚補正手段を設けることが行われている。そしてまた特許文献1には型締装置本体における毎回の或いは数回おきの適当な型締作動回数ごとに型厚補正量を求めることが記載されている。しかしながら特許文献1には、2個以上の成形金型が型開閉方向に連設された射出成形機における型厚寸法の補正については何ら記載されていない。また特許文献1では、型閉の際にバネが圧縮される成形金型を用いた場合の型厚寸法の補正についても何も記載されていない。 When the molding die is replaced in the injection molding machine, the mold thickness dimension of the molding mold is measured, and the measured recording thickness dimension is stored in the storage means, and the mold opening / closing control of the injection molding machine during molding, etc. Used for. However, as the molding time by the injection molding machine becomes longer, the molding die is heated and thermally expanded, so that an error is generated from the mold thickness dimension measured in advance. For this reason, as in Patent Document 1, a mold thickness correcting means for correcting the mold thickness dimension stored in the mold thickness storage means based on the position of the movable mold detected by the mold position detecting means is provided. Further, Patent Document 1 describes that a mold thickness correction amount is obtained for each appropriate number of mold clamping operations every several or several times in the mold clamping device body. However, Patent Document 1 does not describe any correction of the mold thickness dimension in an injection molding machine in which two or more molding dies are continuously provided in the mold opening / closing direction. Further, Patent Document 1 does not describe anything about the correction of the mold thickness when using a mold in which a spring is compressed when the mold is closed.
一方、2個以上の成形金型が型開閉方向に連設された射出成形機の型厚の検出と制御については特許文献2に記載がされている。しかしながら特許文献2は、それぞれ使用される金型厚み等に合わせて回転盤を任意の位置に停止させることや、金型の厚み(それぞれの金型の厚みの合計)に応じて型厚調整機構によりリアプラテンの位置を調整することが記載されているに留まり、型厚寸法の補正については何ら記載されていない。 On the other hand, Patent Document 2 describes the detection and control of the mold thickness of an injection molding machine in which two or more molding dies are connected in the mold opening / closing direction. However, Japanese Patent Laid-Open No. 2004-228688 stops the rotating disk at an arbitrary position according to the thickness of the mold to be used, and the mold thickness adjusting mechanism according to the thickness of the mold (the total thickness of each mold). Only the adjustment of the position of the rear platen is described, and there is no description about correction of the mold thickness dimension.
特開平7−148740号公報(請求項1、0028、図1、図4)JP-A-7-148740 (Claims 1, 0028, FIG. 1, FIG. 4) 特開2011−31535号公報(請求項1、0023、0026、図1)JP 2011-31535 A (Claims 1, 0023, 0026, FIG. 1)
しかしながら2個以上の成形金型が型開閉方向に連設された射出成形機の場合、前記2個以上の成形金型の構造や、2個以上の成形金型を型開閉する型開閉手段の構造や作動が全て同一であることは殆ど無い。そういった中で2個以上の成形金型の型厚寸法をどのようにして適切な値に設定するかは重要な問題となる。 However, in the case of an injection molding machine in which two or more molding dies are connected in the mold opening / closing direction, the structure of the two or more molding dies or a mold opening / closing means for opening / closing the two or more molding dies is provided. The structure and operation are rarely the same. Under such circumstances, how to set the mold thickness dimension of two or more molding dies to an appropriate value is an important problem.
本発明では上記の問題を鑑みて、2個以上の成形金型が型開閉方向に連設された射出成形機において、型厚寸法を適切な値に設定することが可能な射出成形機を提供することを目的とする。 In view of the above problems, the present invention provides an injection molding machine capable of setting the mold thickness dimension to an appropriate value in an injection molding machine in which two or more molding dies are connected in the mold opening / closing direction. The purpose is to do.
本発明の請求項1に記載の射出成形機は、2個以上の成形金型が型開閉方向に連設される射出成形機において、直接的または間接的にそれぞれの成形金型の型厚寸法を測定する型厚測定手段と、型厚測定手段により測定されたそれぞれの成形金型の型厚寸法に対して個別に補正が可能な型厚補正手段と、補正された型厚寸法を保存する記憶手段と、が備えられたことを特徴とする。 The injection molding machine according to claim 1 of the present invention is an injection molding machine in which two or more molding dies are continuously arranged in the mold opening / closing direction, and the mold thickness dimensions of the respective molding dies directly or indirectly. A mold thickness measuring means for measuring the mold thickness, a mold thickness correcting means capable of individually correcting the mold thickness dimension of each molding die measured by the mold thickness measuring means, and storing the corrected mold thickness dimension And a storage means.
本発明の請求項2に記載の射出成形機は、請求項1において、型閉の際にバネが圧縮される成形金型が少なくとも一つ取付けられることを特徴とする。 The injection molding machine according to claim 2 of the present invention is characterized in that in claim 1, at least one molding die to which a spring is compressed when the mold is closed is attached.
本発明の請求項3に記載の射出成形機は、請求項2において、型閉の際にバネが圧縮される成形金型に対応する補正値を保存する記憶手段が備えらえたことを特徴とする。 An injection molding machine according to claim 3 of the present invention is characterized in that in claim 2, a storage means for storing a correction value corresponding to a molding die in which a spring is compressed when the mold is closed is provided. To do.
本発明の請求項4に記載の射出成形機の制御方法は、2個以上の成形金型が型開閉方向に連設された射出成形機の制御方法において、型閉された際にそれぞれの成形金型の型厚寸法を測定し、前記の測定された型厚寸法に対して個別に補正を行い、補正された型厚寸法を制御に用いることを特徴とする。 According to a fourth aspect of the present invention, there is provided a method for controlling an injection molding machine according to a control method for an injection molding machine in which two or more molding dies are continuously arranged in the mold opening / closing direction. The mold thickness dimension of the mold is measured, the measured mold thickness dimension is individually corrected, and the corrected mold thickness dimension is used for control.
本発明の請求項5に記載の射出成形機の制御方法は、請求項4において、少なくとも一つの成形金型の型厚寸法の正の補正値を他の成形金型の型厚寸法の正の補正値以上にすることを特徴とする。 According to a fifth aspect of the present invention, there is provided a method for controlling an injection molding machine according to the fourth aspect, wherein a positive correction value of a mold thickness dimension of at least one molding die is set to a positive value of a mold thickness dimension of another molding mold. It is characterized by having a correction value or more.
本発明の射出成形機は、2個以上の成形金型が型開閉方向に連設される射出成形機において、直接的または間接的にそれぞれの成形金型の型厚寸法を測定する型厚測定手段と、型厚測定手段により測定されたそれぞれの成形金型の型厚寸法に対して個別に補正が可能な型厚補正手段と、補正された型厚寸法を保存する記憶手段と、が備えられているので、型開閉方向に連設された2以上の成形金型の型厚寸法をそれぞれ適切な値に設定することができ、成形時により正確な制御を行うことができる。 The injection molding machine of the present invention is an injection molding machine in which two or more molding dies are continuously arranged in the mold opening / closing direction, and a mold thickness measurement that directly or indirectly measures the mold thickness dimension of each molding dies. Means, a mold thickness correcting means capable of individually correcting the mold thickness dimension of each molding die measured by the mold thickness measuring means, and a storage means for storing the corrected mold thickness dimension. Therefore, the mold thickness dimensions of two or more molding dies arranged continuously in the mold opening / closing direction can be set to appropriate values, and more accurate control can be performed during molding.
本発明の本実施形態の射出成形機の平面図であって、型開時の状態を示す図である。It is a top view of the injection molding machine of this embodiment of this invention, Comprising: It is a figure which shows the state at the time of a mold opening. 本発明の本実施形態の射出成形機の平面図であって、型閉時(型厚測定時)の状態を示す図である。It is a top view of the injection molding machine of this embodiment of this invention, Comprising: It is a figure which shows the state at the time of a mold closing (at the time of mold thickness measurement). 本発明の射出成形機の制御方法のフローチャート図である。It is a flowchart figure of the control method of the injection molding machine of this invention. 本発明の射出成形機の別の制御方法を示す概略図である。It is the schematic which shows another control method of the injection molding machine of this invention. 本発明の別の実施形態の射出成形機を示す概略図である。It is the schematic which shows the injection molding machine of another embodiment of this invention. 本発明の更に別の実施形態の射出成形機を示す概略図である。It is the schematic which shows the injection molding machine of another embodiment of this invention.
本発明の実施形態の射出成形機11について、図1、図2を参照して説明する。射出成形機11は、2個以上の成形金型A,Bが型開閉方向に連設される射出成形機である。ベッド12の上面には型締装置13が配置されている。型締装置13は、可動金型14が取付けられ型開閉方向に移動自在な可動盤15と固定金型16が取付けられ固定的に設けられた固定盤17との間に、型開閉方向に移動自在な中間部材19が設けられている。中間部材19にはその一部を構成する回転盤20が回転可能に取付けられ、回転盤20の両面にはそれぞれ中間金型18,18が取付けられる。そして型閉時および型締時には固定金型16と前記中間金型18の一方とにより固定側の成形金型Aが形成され、可動金型14と前記中間金型18の他方とにより可動側の成形金型Bが形成される。なお成形金型Aは中間金型18が成形の際に回転盤20の180°反転とともに反転されるので、常時同じ中間金型18と固定金型16によって形成される訳ではなく、異なる中間金型18とも形成される。また成形金型Bも常時同じ中間金型18と可動金型14によって形成される訳ではなく、異なる中間金型18とも形成される。 An injection molding machine 11 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The injection molding machine 11 is an injection molding machine in which two or more molding dies A and B are continuously provided in the mold opening / closing direction. A mold clamping device 13 is disposed on the upper surface of the bed 12. The mold clamping device 13 moves in the mold opening / closing direction between the movable platen 15 to which the movable mold 14 is attached and movable in the mold opening / closing direction and the fixed platen 16 to which the fixed die 16 is fixedly provided. A free intermediate member 19 is provided. A rotating plate 20 constituting a part of the intermediate member 19 is rotatably attached, and intermediate molds 18 and 18 are attached to both surfaces of the rotating plate 20, respectively. When the mold is closed and when the mold is clamped, the fixed mold 16 and one of the intermediate molds 18 form a fixed mold A, and the movable mold 14 and the other of the intermediate molds 18 move the movable mold. A molding die B is formed. The molding die A is not always formed by the same intermediate die 18 and the fixed die 16 because the intermediate die 18 is inverted together with the 180 ° reversal of the turntable 20 when the intermediate die 18 is molded. A mold 18 is also formed. Further, the molding die B is not always formed by the same intermediate mold 18 and the movable mold 14, but is also formed by different intermediate molds 18.
前記固定盤17の四隅近傍には型締手段21である油圧によって作動される型締シリンダ22が設けられ、型締シリンダ22のロッドがタイバ23を構成している。タイバ23は、前記可動盤15と、前記中間部材19にも挿通されている。また可動盤15の外側面のタイバ23の挿通部分の近傍にはハーフナット24が設けられ、タイバ23に設けられた係止部25に係止されるようになっている。なお型締手段21の配置はこれに限定されず可動盤15側に型締シリンダが設けられたものやトグル機構を用いたものでもよい。 In the vicinity of the four corners of the fixed platen 17, mold clamping cylinders 22 that are operated by hydraulic pressure as mold clamping means 21 are provided, and the rods of the mold clamping cylinders 22 constitute tie bars 23. The tie bar 23 is also inserted through the movable platen 15 and the intermediate member 19. Further, a half nut 24 is provided in the vicinity of the insertion portion of the tie bar 23 on the outer side surface of the movable platen 15 so as to be locked to a locking portion 25 provided on the tie bar 23. The arrangement of the mold clamping means 21 is not limited to this, and a mold clamping cylinder provided on the movable platen 15 side or a toggle mechanism may be used.
また射出成形機11は可動盤15(可動金型14を含む)を型開閉方向に移動させる型開閉手段26と、中間部材19(中間金型18,18および回転盤20を含む)を型開閉方向に移動させる型開閉手段27が設けられている。可動盤の型開閉手段26(可動金型の型開開閉手段)は、ベッド12上に固定されたサーボモータ28の駆動軸とベッド12上に軸支されたボールねじ29とがベルト等を介して連結されている。サーボモータ28にはロータリエンコーダ31が設けられている。 The injection molding machine 11 also opens and closes a mold opening / closing means 26 for moving the movable platen 15 (including the movable mold 14) in the mold opening / closing direction, and an intermediate member 19 (including the intermediate molds 18, 18 and the rotating plate 20). A mold opening / closing means 27 for moving in the direction is provided. The movable plate mold opening / closing means 26 (movable mold mold opening / closing means) includes a drive shaft of a servo motor 28 fixed on the bed 12 and a ball screw 29 pivotally supported on the bed 12 via a belt or the like. Are connected. The servo motor 28 is provided with a rotary encoder 31.
可動盤15の側面のブラケットにはボールねじナット33が固定され、ボールねじナット33にはボールねじ29が挿入されている。またサーボモータ28は、サーボアンプ34を介して射出成形機11全体を統括する制御装置35に接続されている。上記のベッド12または固定盤17に対する可動盤15の位置を検出することができるサーボモータ28、ロータリエンコーダ31を含む可動盤の型開閉手段26は、本発明の型厚測定手段も構成する。なお、図1,図2では1基の可動盤の型開閉手段26しか図示されていないが、一般的には2基〜4基が設けられる。 A ball screw nut 33 is fixed to a bracket on the side surface of the movable platen 15, and a ball screw 29 is inserted into the ball screw nut 33. The servo motor 28 is connected to a control device 35 that controls the entire injection molding machine 11 via a servo amplifier 34. The mold opening / closing means 26 of the movable plate including the servo motor 28 and the rotary encoder 31 capable of detecting the position of the movable plate 15 with respect to the bed 12 or the fixed plate 17 also constitutes the mold thickness measuring unit of the present invention. 1 and 2, only one movable plate mold opening / closing means 26 is shown, but generally two to four groups are provided.
可動盤15と中間部材19の間を型開閉する中間部材の型開閉手段27(中間金型の型開開閉手段)については、可動盤15の側面のブラケットにサーボモータ36が固定され、中間部材19にボールねじナット37が固定され、前記ボールねじナット37に挿通されるボールねじ38が、サーボモータ36の駆動軸と連結されている。そしてサーボモータ36にはロータリエンコーダ39が設けられている。またサーボモータ36は、サーボアンプ40を介して射出成形機11全体を統括する制御装置35に接続されている。上記の中間部材19の位置を検出することができるサーボモータ36、ロータリエンコーダ39を含む中間部材の型開閉手段27は、本発明の型厚測定手段も構成する。なお、図1,図2では1基の中間部材の型開閉手段27しか図示されていないが、一般的には2基〜4基が設けられる。なお可動盤の型開閉手段26と中間部材の型開閉手段27の取付けられる盤やベッド、サーボモータ28,36の駆動軸とボールねじ29,38の連結方法などもこれに限定されない。またサーボモータ28,36は、電磁ブレーキを備えたものでもよい。 As for the mold opening / closing means 27 (middle mold opening / closing means) of the intermediate member for opening and closing the mold between the movable platen 15 and the intermediate member 19, a servo motor 36 is fixed to the bracket on the side surface of the movable platen 15, and the intermediate member A ball screw nut 37 is fixed to the ball screw nut 19, and a ball screw 38 inserted through the ball screw nut 37 is connected to the drive shaft of the servo motor 36. The servo motor 36 is provided with a rotary encoder 39. The servo motor 36 is connected to a control device 35 that controls the entire injection molding machine 11 via a servo amplifier 40. The mold opening / closing means 27 of the intermediate member including the servo motor 36 and the rotary encoder 39 capable of detecting the position of the intermediate member 19 also constitutes the mold thickness measuring means of the present invention. 1 and 2, only one intermediate member mold opening / closing means 27 is shown, but generally two to four groups are provided. It should be noted that the method of connecting the plate and bed to which the mold opening / closing means 26 of the movable plate 26 and the mold opening / closing means 27 of the intermediate member are attached, the drive shafts of the servo motors 28 and 36, and the ball screws 29 and 38 are not limited thereto. The servo motors 28 and 36 may be provided with an electromagnetic brake.
また固定盤17の外側のベッド12上には第1の射出装置41が設けられ、可動盤15の外側には可動盤15とともに移動する第2の射出装置42が設けられている。制御装置35は射出成形機11の全体の制御を行うが、本発明の型厚寸法の補正に関する部分においては、型厚測定手段により測定されたそれぞれの成形金型A,Bの型厚寸法t1,t2を取り込んで前記型厚寸法t1,t2に対して個別に補正が可能な型厚補正手段43と、補正された型厚寸法t1a,t2bを保存する記憶手段44を備えている。また制御装置35は設定画面45に接続されている。 A first injection device 41 is provided on the bed 12 outside the fixed platen 17, and a second injection device 42 that moves together with the movable platen 15 is provided outside the movable platen 15. The control device 35 performs overall control of the injection molding machine 11, but in the part relating to the correction of the mold thickness dimension of the present invention, the mold thickness dimension t1 of the respective molding dies A and B measured by the mold thickness measuring means. , T2 and a mold thickness correcting means 43 capable of individually correcting the mold thickness dimensions t1 and t2, and a storage means 44 for storing the corrected mold thickness dimensions t1a and t2b. The control device 35 is connected to the setting screen 45.
次に射出成形機11の制御方法について説明する。射出成形機11では成形を開始する前(特に初回には必ず)に固定側の成形金型A、可動側の成形金型Bの型厚寸法を測定し、制御に用いる。より具体的には成形金型Aと成形金型Bの型厚寸法の測定・設定により、可動盤の型開閉手段26の制御原点を定め、制御原点を基準にして、可動盤15の型閉完了位置、金型保護開始位置、型開閉の速度の変更位置、型開完了位置などが設定される。また中間部材19についても中間部材の型開閉手段27の制御原点を定め、制御原点を基準にして、中間部材の型閉完了位置、金型保護開始位置、型開閉の速度の変更位置、型開完了位置などが設定される。従って成形金型Aと成形金型Bの型厚寸法を正確に設定することは非常に重要である。 Next, a control method of the injection molding machine 11 will be described. The injection molding machine 11 measures the mold thickness dimensions of the fixed-side mold A and the movable-side mold B before starting molding (especially the first time), and uses it for control. More specifically, the control origin of the mold opening / closing means 26 of the movable platen is determined by measuring and setting the mold thickness dimensions of the molding die A and the molding die B, and the mold closing of the movable platen 15 is performed based on the control origin. A completion position, a mold protection start position, a mold opening / closing speed changing position, a mold opening completion position, and the like are set. For the intermediate member 19, the control origin of the mold opening / closing means 27 of the intermediate member is determined, and the mold closing completion position of the intermediate member, the mold protection start position, the mold opening / closing speed change position, the mold opening are determined based on the control origin. The completion position is set. Therefore, it is very important to accurately set the mold thickness dimensions of the mold A and the mold B.
しかしながら本発明の2個以上の成形金型A、成形金型Bが型開閉方向に連設される射出成形機11の場合、中間部材の型開閉手段27と可動盤の型開閉手段26が相互に関与しており、成形金型Aと成形金型Bの構造や、中間部材の型開閉手段27と可動盤の型開閉手段26の構造や作動がそれぞれ異なるので、成形金型Aと成形金型Bの型厚寸法をそれぞれ単独で正確に測定することは難しい。また型厚測定時の型閉完了の判断は、可動金型14と中間金型18、固定金型16と中間金型18がそれぞれ型当接した際の型開閉手段のサーボモータ28,36のトルクを検出して行うので、型閉完了と判断した際にボールねじ29,38に負荷が発生して伸びが生じたり成形金型A、成形金型Bが圧縮されたりしている場合に正確な型厚測定に影響を与えるといった問題もある。 However, in the case of the injection molding machine 11 in which two or more molding dies A and B are continuously provided in the mold opening / closing direction, the mold opening / closing means 27 of the intermediate member and the mold opening / closing means 26 of the movable plate are mutually connected. Since the structure of the molding die A and the molding die B and the structure and operation of the mold opening / closing means 27 of the intermediate member and the mold opening / closing means 26 of the movable plate are different, respectively. It is difficult to accurately measure the mold thickness dimensions of the mold B individually. The determination of the completion of mold closing at the time of mold thickness measurement is performed by the servo motors 28 and 36 of the mold opening / closing means when the movable mold 14 and the intermediate mold 18 and the fixed mold 16 and the intermediate mold 18 are in contact with the mold, respectively. Since the torque is detected, it is accurate when a load is generated on the ball screws 29 and 38 when it is determined that the mold closing is completed, and the mold A and the mold B are compressed. There is also a problem of affecting the mold thickness measurement.
次に型厚測定および型厚補正の具体的な手順について図3のフローチャート図で説明する。まず射出成形機の制御装置35の記憶手段44には、成形金型Aの型厚寸法の補正値a(オフセット値)と成形金型Bの型厚寸法の補正値b(オフセット値)が前もって保存されている。成形金型Aと成形金型Bの型厚寸法の補正値a,b(オフセット値)は、上記したように型開閉用のボールねじ29,38の伸びや成形金型A、成形金型Bの圧縮に対応するものであり、通常の場合、正の補正値a,b(オフセット値)がそれぞれ保存されている。ただし変形例として成形金型Aと成形金型Bの型厚寸法の補正値a,b(オフセット値)はそれぞれ作業者が設定画面から個別に設定可能なものであってもよい。また結果的に同じ補正値を用いる場合も本発明に含まれる。更にまたいずれかの型厚寸法t1,t2の補正を行わない場合も本発明に含まれる。また前記の固定型と可動側の型厚寸法の個別の補正値a,b(オフセット値)は、出荷時から組込まれているものでもよい。 Next, a specific procedure for mold thickness measurement and mold thickness correction will be described with reference to the flowchart of FIG. First, in the storage means 44 of the control device 35 of the injection molding machine, the correction value a (offset value) of the mold thickness dimension of the molding die A and the correction value b (offset value) of the mold thickness dimension of the molding die B are stored in advance. Saved. As described above, the correction values a and b (offset values) of the mold thickness dimensions of the molding die A and the molding die B are the elongations of the ball screws 29 and 38 for opening and closing the die, the molding die A, and the molding die B. In normal cases, positive correction values a and b (offset values) are stored. However, as a modification, the correction values a and b (offset values) of the mold thickness dimensions of the molding die A and the molding die B may be individually set by the operator from the setting screen. Further, the case where the same correction value is used as a result is also included in the present invention. Furthermore, the present invention includes a case where any of the mold thickness dimensions t1 and t2 is not corrected. The individual correction values a and b (offset values) of the fixed mold and movable mold thickness dimensions may be incorporated from the time of shipment.
射出成形機11の成形金型A、成形金型Bが初回の成形金型に交換した場合には必ず型厚寸法の測定を行う。そして測定された型厚寸法(補正された型厚寸法を含む)は記憶手段44に保存され、次回以降の成形の際に使用される。後日に射出成形機11の金型を再び成形金型A、成形金型Bに交換した場合は、前回測定した型厚寸法が記憶手段44に保存されているので、型厚寸法の測定は実施してもよいが、必ずしも必要ではない。 When the molding die A and the molding die B of the injection molding machine 11 are replaced with the first molding die, the mold thickness dimension is always measured. Then, the measured mold thickness dimension (including the corrected mold thickness dimension) is stored in the storage means 44 and used in the next molding. When the mold of the injection molding machine 11 is replaced with the molding mold A and the molding mold B at a later date, the mold thickness dimension measured last time is stored in the storage means 44, so the mold thickness dimension is measured. You may, but it is not necessary.
型厚寸法の測定は、固定盤17、中間部材19の回転盤20、可動盤15に成形金型A、成形金型Bが取付られた後、半自動成形を含む成形を開始する前に行う。まず中間部材19および中間金型18,18、可動盤15および可動金型14がそれぞれ型開完了位置にある状態から説明を開始する。作業者が設定画面45の型閉スイッチを入力して(s1)自動型厚調整モードをスタートする。すると次に可動盤の型開閉手段26のサーボモータ28と中間部材の型開閉手段27のサーボモータ36が作動開始して(s2)、可動盤15と可動金型14が中間部材19および中間金型18,18に向けて移動される。この際中間部材の型開閉手段27のサーボモータ36は、可動盤15と中間部材19の距離を縮小する方向に作動する。そしてこの際の固定盤17に対する中間部材19の位置は変更されない。そして可動金型14と中間金型18の型当接の判断は、サーボモータ36のトルクが設定されたトルク制限値を感知したことにより行われ(s3)、型当接されたと判断されると前記サーボモータ36をサーボフリーにする(s4)。 The mold thickness dimension is measured after the molding die A and the molding die B are attached to the stationary platen 17, the rotating plate 20 of the intermediate member 19, and the movable platen 15, and before molding including semi-automatic molding is started. First, the description starts from a state in which the intermediate member 19 and the intermediate molds 18 and 18, the movable platen 15, and the movable mold 14 are in the mold opening completion position. The operator inputs the mold closing switch on the setting screen 45 (s1) to start the automatic mold thickness adjustment mode. Then, the servo motor 28 of the mold opening / closing means 26 of the movable plate and the servo motor 36 of the mold opening / closing means 27 of the intermediate member start operation (s2), and the movable plate 15 and the movable mold 14 are moved to the intermediate member 19 and the intermediate mold. It is moved toward the mold 18,18. At this time, the servo motor 36 of the mold opening / closing means 27 of the intermediate member operates in a direction to reduce the distance between the movable platen 15 and the intermediate member 19. At this time, the position of the intermediate member 19 with respect to the fixed platen 17 is not changed. Then, the determination of the mold contact between the movable mold 14 and the intermediate mold 18 is made by detecting the torque limit value in which the torque of the servo motor 36 is set (s3). The servo motor 36 is made servo-free (s4).
次に再度可動盤の型開閉手段26のサーボモータ28を作動開始して(s5)、可動盤15、可動金型14、中間部材19、および中間金型18,18が固定盤17および固定金型16に向けて移動される。そして固定金型16と中間金型18(固定金型側)の型当接の判断は、サーボモータ28のトルクがトルク制限値を感知したことにより行われる(s6)。そして固定金型16と中間金型18が型当接されたと判断されると、次に型厚測定手段である中間部材の型開閉手段27のサーボモータ36のロータリエンコーダ39の検出値を読取って可動盤15に対する中間部材19の位置検出が行われる(s7)。そして前記可動盤15に対する中間部材19の位置から成形金型Bの型厚寸法t2(可動側型厚)の測定値を演算する(s8)。従って成形金型Bの型厚寸法の測定は直接的に行われる。また型厚測定手段である可動盤の型開閉手段26のサーボモータ28のロータリエンコーダ31の検出値を読取って固定盤17に対する可動盤15の位置検出が行われる(s9)。そして固定盤17に対する可動盤15の位置から前記成形金型Bの型厚寸法を減算処理して成形金型Aの型厚寸法t1(固定側型厚)の測定値を演算する(s10)。従って成形金型Aの型厚寸法の測定は間接的に行われる。 Next, the servo motor 28 of the mold opening / closing means 26 of the movable plate is started again (s5), and the movable plate 15, the movable mold 14, the intermediate member 19, and the intermediate molds 18, 18 are replaced with the fixed plate 17 and the fixed mold. It is moved toward the mold 16. The determination of the mold contact between the fixed mold 16 and the intermediate mold 18 (on the fixed mold side) is made when the torque of the servo motor 28 senses the torque limit value (s6). When it is determined that the fixed mold 16 and the intermediate mold 18 are in contact with each other, the detection value of the rotary encoder 39 of the servo motor 36 of the mold opening / closing means 27 of the intermediate member which is the mold thickness measuring means is read next. The position of the intermediate member 19 relative to the movable platen 15 is detected (s7). Then, the measured value of the mold thickness dimension t2 (movable side mold thickness) of the molding die B is calculated from the position of the intermediate member 19 with respect to the movable platen 15 (s8). Therefore, the measurement of the mold thickness dimension of the molding die B is performed directly. Further, the detection value of the rotary encoder 31 of the servo motor 28 of the mold opening / closing means 26 of the movable plate which is the mold thickness measuring means is read to detect the position of the movable plate 15 relative to the fixed plate 17 (s9). The mold thickness dimension of the molding die B is subtracted from the position of the movable platen 15 with respect to the fixed platen 17 to calculate the measured value of the mold thickness dimension t1 (fixed side mold thickness) of the molding die A (s10). Therefore, the measurement of the mold thickness dimension of the molding die A is performed indirectly.
次に記憶手段44に予め設定保存した成形金型Bの型厚寸法の補正値b(オフセット値)を用いて、型厚補正手段43により成形金型Bの型厚寸法の補正を行う(s11)。そして補正後の成形金型Bの型厚寸法t2bを記憶手段44に保存する(s12)。また記憶手段に予め設定保存した成形金型Aの型厚寸法の補正値a(オフセット値)を用いて、型厚補正手段43により固定側の型厚寸法の補正を行い(s13)、補正後の成形金型Aの型厚寸法t1aを記憶手段44に保存する(s14)。これに限定されないが本実施形態では、成形金型Bの測定された型厚寸法t2に対して正の補正値bを加算して補正された型厚寸法t2bを求める。また成形金型Aの測定された型厚寸法t1に対して成形金型Bの補正値b以上の正の補正値aを加算して補正された型厚寸法t1aを求める。このように成形金型Aの側の補正値aを成形金型Bの補正値b以上(または補正値bよりも大きく)にするのは、可動盤の型開閉手段26のボールねじ29の長さのほうが中間部材の型開閉手段27のボールねじ38の長さよりも長くて伸びが生じやすく、型厚寸法を測定する際に成形金型Aの型厚寸法t1の測定値のほうが成形金型Bの型厚寸法t2の測定値よりも実際の金型寸法と比較して小さく測定される傾向にあるからである。ただし成形金型Aの側の補正値aと成形金型Bの補正値bは同じ値となること有り得る。そして記憶手段44に保存された補正後の型厚寸法t1aおよびt2bは、次に記載されるように射出成形機11の成形サイクルの制御に用いられる。ただし補正後の型厚寸法t1a,t2bで成形を行って問題がある場合は、補正値a、補正値bを変更し、制御に用いる型厚寸法t1a,t2bを変更し直してもよい。 Next, using the correction value b (offset value) of the mold thickness dimension of the molding die B preset and stored in the storage means 44, the mold thickness dimension of the molding mold B is corrected by the mold thickness correction means 43 (s11). ). Then, the corrected mold thickness dimension t2b of the molding die B is stored in the storage means 44 (s12). Further, using the correction value a (offset value) of the mold thickness dimension of the molding die A preset and stored in the storage means, the mold thickness correction means 43 corrects the fixed-side mold thickness dimension (s13), and after correction The mold thickness dimension t1a of the molding die A is stored in the storage means 44 (s14). Although not limited to this, in the present embodiment, a corrected mold thickness dimension t2b is obtained by adding a positive correction value b to the measured mold thickness dimension t2 of the molding die B. Further, a corrected mold thickness dimension t1a is obtained by adding a positive correction value a equal to or larger than the correction value b of the molding mold B to the measured mold thickness dimension t1 of the molding mold A. The reason why the correction value a on the side of the molding die A is set to be equal to or larger than the correction value b of the molding die B (or larger than the correction value b) is that the length of the ball screw 29 of the mold opening / closing means 26 of the movable platen. The length is longer than the length of the ball screw 38 of the mold opening / closing means 27 of the intermediate member and is likely to be stretched. When measuring the mold thickness dimension, the measured value of the mold thickness dimension t1 of the mold A is the molding mold. This is because the measured value of the mold thickness dimension t2 of B tends to be measured smaller than the actual mold dimension. However, the correction value a on the mold A side and the correction value b on the mold B may be the same value. The corrected mold thickness dimensions t1a and t2b stored in the storage means 44 are used for controlling the molding cycle of the injection molding machine 11 as described below. However, in the case where there is a problem by performing molding with the corrected mold thickness dimensions t1a and t2b, the correction value a and the correction value b may be changed, and the mold thickness dimensions t1a and t2b used for control may be changed again.
次に型厚寸法t1a,t2bを設定後の射出成形機11の成形サイクルの制御について説明する。射出成形機11の型閉工程では、固定金型16、中間金型18,18、可動金型14が型開きされた状態から中間部材19の型開閉手段27のサーボモータ36、可動盤15の型開閉手段26のサーボモータ28が作動されると、記憶手段44に記憶された成形金型Bの補正後の型厚寸法t2bと成形金型Aの補正後の型厚寸法t1aに基づいて、それぞれ型閉完了位置まで中間金型18,18、可動金型14がクローズドループ制御により移動される。その際に型開閉速度が変化する位置や金型保護開始位置についてもサーボモータ28,36のロータリエンコーダ31,39の検出値を読取って制御がなされることは言うまでもない。そして固定金型16と中間金型18による成形金型Aの型閉完了と中間金型18と可動金型14による成形金型Bの型閉完了がほぼ同時に行われる。 Next, the control of the molding cycle of the injection molding machine 11 after setting the mold thickness dimensions t1a and t2b will be described. In the mold closing process of the injection molding machine 11, the servo motor 36 of the mold opening / closing means 27 of the intermediate member 19 and the movable plate 15 are moved from the state in which the fixed mold 16, the intermediate molds 18, 18 and the movable mold 14 are opened. When the servo motor 28 of the mold opening / closing means 26 is actuated, based on the corrected mold thickness dimension t2b of the molding die B and the corrected mold thickness dimension t1a of the molding mold A stored in the storage means 44, The intermediate molds 18 and 18 and the movable mold 14 are moved by closed loop control to the respective mold closing completion positions. Needless to say, the positions at which the mold opening / closing speed changes and the mold protection start position are controlled by reading the detection values of the rotary encoders 31 and 39 of the servo motors 28 and 36. Then, the mold closing of the molding die A by the fixed mold 16 and the intermediate mold 18 and the mold closing of the molding die B by the intermediate mold 18 and the movable mold 14 are completed almost simultaneously.
型締工程を開始するに際して可動盤15が型閉完了位置に停止した状態で、可動盤15のハーフナット24の係止歯がタイバ23の係止部25に係止され、次に型締シリンダ22を作動させて成形金型Aおよび成形金型Bの型締を行う。型締が完了すると射出工程が開始され、第1の射出装置41から成形金型Aに1次成形用の樹脂の射出が行われ、第2の射出装置42から成形金型Bに2次成形用の樹脂の射出が行われる(この際に前回の1次成形品は成形金型Bのキャビティ内に残存しており2次成形によって樹脂が追加・結合される。そして所定時間、冷却工程が行われる。冷却工程が完了すると型締シリンダ22を用いて成形金型Aまたは成形金型Bの離型(強力型開工程)が行われる。また次の型開工程では、可動盤の型開閉手段26のサーボモータ28、中間部材の型開閉手段27のサーボモータ36が作動され、成形金型Aと成形金型Bがそれぞれ型開される。中間金型18,18と可動金型14が型開完了位置に到達すると取出工程が行われ、図示しない取出機により成形金型Bの一方の金型から2次成形の終了した複合成形品が取出される。そして回転盤20が180°回転され、1次成形品が貼り付いた中間金型18が可動金型側に移動される。そして再度、次の型閉工程が開始される。 With the movable platen 15 stopped at the mold closing completion position when the mold clamping process is started, the locking teeth of the half nut 24 of the movable platen 15 are locked to the locking portion 25 of the tie bar 23, and then the mold clamping cylinder. 22 is operated to clamp the mold A and the mold B. When the mold clamping is completed, an injection process is started, and the primary injection resin is injected from the first injection device 41 to the molding die A, and the secondary molding is performed from the second injection device 42 to the molding die B. (In this case, the previous primary molded product remains in the cavity of the molding die B, and the resin is added and bonded by secondary molding. The cooling process is performed for a predetermined time. When the cooling process is completed, the mold A or the mold B is released (strong mold opening process) using the clamping cylinder 22. In the next mold opening process, the movable plate is opened and closed. The servo motor 28 of the means 26 and the servo motor 36 of the mold opening / closing means 27 of the intermediate member are operated to open the molds A and B. The intermediate molds 18 and 18 and the movable mold 14 are opened. When the mold opening completion position is reached, an unloading process is performed and unillustrated unloading As a result, the composite molded product that has been subjected to the secondary molding is taken out from one mold of the molding die B. Then, the rotating plate 20 is rotated 180 °, and the intermediate mold 18 to which the primary molded product is attached is the movable mold. Then, the next mold closing process is started again.
次に本発明の射出成形機11の別の制御方法について図4により説明する。別の制御方法に用いる射出成形機11の構造については、図1と同じであるので説明を省略する。別の制御方法の型厚寸法の測定は、最初に可動金型14および中間金型18,18が型開完了位置にある状態(図4の(a)の状態)から、可動盤の型開閉手段26のサーボモータ28のみを作動させて、可動盤15、可動金型14、中間部材19、および中間金型18,18を型閉完了方向へ移動させる。この際に中間部材の型開閉手段27のサーボモータ36はロックされている。そして固定金型16に対して中間金型18の型当接が検出されたら(図4の(b)の状態)、成形金型Aの型厚寸法をロータリエンコーダ31により測定する。そして記憶手段44に予め設定保存した成形金型Aの補正値a(オフセット値)を用いて、型厚補正手段43により型厚寸法の補正を行い、補正後の成形金型Aの型厚寸法t1aを記憶手段44に保存する。 Next, another control method of the injection molding machine 11 of the present invention will be described with reference to FIG. The structure of the injection molding machine 11 used for another control method is the same as that shown in FIG. In another control method, the mold thickness dimension is measured by firstly opening and closing the movable plate from the state where the movable mold 14 and the intermediate molds 18 and 18 are in the mold opening completion position (the state of FIG. 4A). Only the servo motor 28 of the means 26 is operated, and the movable platen 15, the movable mold 14, the intermediate member 19, and the intermediate molds 18 and 18 are moved in the mold closing completion direction. At this time, the servo motor 36 of the mold opening / closing means 27 of the intermediate member is locked. When the contact of the intermediate mold 18 with the fixed mold 16 is detected (the state shown in FIG. 4B), the mold thickness dimension of the mold A is measured by the rotary encoder 31. Then, using the correction value a (offset value) of the molding die A preset and stored in the storage means 44, the die thickness dimension is corrected by the mold thickness correcting means 43, and the corrected mold thickness dimension of the molding die A is corrected. t1a is stored in the storage means 44.
次に可動盤の型開閉手段26のサーボモータ28をサーボロックした状態として、中間部材の型開閉手段27のサーボモータ36のみを作動させて、中間部材19、および中間金型18,18を可動金型14へ向けて移動させる。そして可動金型14と中間金型18の型当接が検出されたら(図4の(c)の状態)、成形金型Bの型厚寸法をロータリエンコーダ39により測定する。そして記憶手段44に予め設定保存した成形金型Bの補正値b(オフセット値)を用いて、型厚補正手段43により型厚寸法の補正を行い、補正後の成形金型Bの型厚寸法t2bを記憶手段44に保存する。そして補正後の成形金型Aの型厚寸法t1aと補正後の成形金型Bの型厚寸法t2bは成形時の制御に用いられる。なお図4において成形金型Bの型厚寸法を先に測定してから成形金型Aの型厚寸法を後で測定してもよい。また上記の実施形態以外の方法で射出成形機11を用いての型厚寸法の測定と補正と保存を行ってもよい。 Next, in a state where the servo motor 28 of the mold opening / closing means 26 of the movable plate is servo-locked, only the servo motor 36 of the mold opening / closing means 27 of the intermediate member is operated to move the intermediate member 19 and the intermediate molds 18, 18. Move toward the mold 14. When the mold contact between the movable mold 14 and the intermediate mold 18 is detected (the state shown in FIG. 4C), the mold thickness dimension of the molding mold B is measured by the rotary encoder 39. Then, using the correction value b (offset value) of the molding die B set and stored in advance in the storage unit 44, the mold thickness dimension is corrected by the mold thickness correcting unit 43, and the corrected mold thickness dimension of the molding die B is obtained. t2b is stored in the storage means 44. The corrected mold thickness dimension t1a of the molding die A and the corrected mold thickness dimension t2b of the molding die B are used for control during molding. In FIG. 4, the mold thickness dimension of the molding die A may be measured after the mold thickness dimension of the molding die B is measured first. Further, measurement, correction, and storage of the mold thickness dimension using the injection molding machine 11 may be performed by a method other than the above embodiment.
なお図1の射出成形機11において、回転盤20と中間金型18,18は回転させないで、両方の成形金型A、成形金型Bを同時に型締し、第1の射出装置41から成形金型Aのみに、第2の射出装置42から成形金型Bのみに溶融樹脂を射出して単色の成形品を成形するものでもよい。また射出成形機11の変形例として、中間部材(中間盤)に中間金型を回転させる機構が備えられておらず、固定金型と中間部材の一方の面に取付けられる中間金型(常時同じ中間金型)とにより成形金型Aが形成され、可動金型と中間部材の他方の面に取付けられる中間金型(常時同じ中間金型)により成形金型Bが形成されるものでもよい。前記変形例の場合も成形金型の数は2個以上であればよい。 In the injection molding machine 11 of FIG. 1, both the molding die A and the molding die B are clamped at the same time without rotating the turntable 20 and the intermediate dies 18 and 18, and molding is performed from the first injection device 41. Only the mold A may be formed by injecting a molten resin only from the second injection device 42 to the molding mold B to form a single-color molded product. Further, as a modification of the injection molding machine 11, the intermediate member (intermediate disk) is not provided with a mechanism for rotating the intermediate mold, and the intermediate mold attached to one surface of the fixed mold and the intermediate member (always the same) The molding die A may be formed by the intermediate die), and the molding die B may be formed by the intermediate die (always the same intermediate die) attached to the movable die and the other surface of the intermediate member. In the case of the modification, the number of molding dies may be two or more.
また本発明は2個以上の金型が型開閉方向に連設される射出成形機であればよく、図5に示されるように3個の成形金型C,D,Eが型開閉方向に連設された射出成形機51でもよい。図5では固定盤52に固定金型53が取付けられる。そして180°反転可能な第1の中間部材54の両面に第1の中間金型55、55がそれぞれ取付けられる。また180°反転可能な第2の中間部材56の両面に第2の中間金型57,57がそれぞれ取付けられる。そして可動盤58に可動金型59が取付けられる。 Further, the present invention may be an injection molding machine in which two or more molds are connected in the mold opening / closing direction. As shown in FIG. 5, three molding dies C, D, E are arranged in the mold opening / closing direction. The injection molding machine 51 provided continuously may be used. In FIG. 5, a fixed mold 53 is attached to the fixed platen 52. Then, first intermediate molds 55 and 55 are attached to both surfaces of the first intermediate member 54 that can be turned 180 °. Further, second intermediate molds 57 and 57 are attached to both surfaces of the second intermediate member 56 that can be turned 180 °. A movable mold 59 is attached to the movable platen 58.
第1の中間部材54は第1の型開閉機構60により型開閉方向に移動可能であり、第2の中間部材56は第2の型開閉機構61により型開閉方向に移動可能であり、可動盤58は第3の型開閉機構62により型開閉方向に移動可能である。そしてそれぞれ第1の型開閉機構60、第2の型開閉機構61、および第3の型開閉機構62の作動によりそれぞれの成形金型C,D,Eの型閉が行われる。また図5の実施形態では、図示しない型締機構により成形金型C,D,Eは型締がなされる。射出成形機51についても図示しない射出装置が複数設けられる。 The first intermediate member 54 can be moved in the mold opening / closing direction by the first mold opening / closing mechanism 60, and the second intermediate member 56 can be moved in the mold opening / closing direction by the second mold opening / closing mechanism 61. 58 is movable in the mold opening / closing direction by the third mold opening / closing mechanism 62. The molds C, D, and E are closed by the operations of the first mold opening / closing mechanism 60, the second mold opening / closing mechanism 61, and the third mold opening / closing mechanism 62, respectively. In the embodiment of FIG. 5, the molds C, D, and E are clamped by a mold clamping mechanism (not shown). The injection molding machine 51 is also provided with a plurality of injection devices (not shown).
そして型厚寸法の測定の際には、それぞれの型厚測定手段である第1の型開閉機構60,第2の型開閉機構61,第3の型開閉機構62により成形金型C,D,Eの型厚寸法が測定されるが、それぞれ成形金型や型開閉機構の構造の相違から初期の型厚寸法が正確に行われない場合があるので、型厚補正手段により個別に型厚寸法の補正が可能となっている。なお型厚寸法の補正については、補正が可能でも補正を行わないものでもよく、補正の有無の設定が可能なものでもよい。補正された型厚寸法は記憶手段に格納され、成形時の制御に用いられる。 When measuring the mold thickness dimension, the first mold opening / closing mechanism 60, the second mold opening / closing mechanism 61, and the third mold opening / closing mechanism 62, which are the respective mold thickness measuring means, are used to form the molds C, D, Although the mold thickness dimension of E is measured, the initial mold thickness dimension may not be accurately performed due to the difference in the structure of the molding die and the mold opening / closing mechanism. Correction is possible. As for the correction of the mold thickness dimension, it may be possible to correct or not perform the correction, or it may be possible to set whether or not to correct. The corrected mold thickness dimension is stored in the storage means and used for control during molding.
次に本発明の図6の2個以上の金型が型開閉方向に連設される射出成形機71について説明する。射出成形機71は中央に固定盤72が固定的に設けられ、固定盤72には縦方向の軸を中心に回転する中間盤73が設けられている。そして前記中間盤73の両面にそれぞれ中間金型74,74が取付けられている。また図6において左側には固定盤72に対して第1の型開閉機構75により型開閉される第1の可動盤76が設けられ、第1の可動盤76には第1の可動金型77が取付けられている。また図6において右側には固定盤72に対して第2の型開閉機構78により型開閉される第2の可動盤79が設けられ、第2の可動盤79には第2の可動金型80が取付けられている。そして図示しない型締装置が設けられ、型締時には中間金型74,74のいずれか一方と第1の可動金型77が成形金型Fを構成し、中間金型74,74のいずれか他方と第2の可動金型80が成形金型Gを構成する。また第1の可動盤76および第2の可動盤79の外側には図示しない射出装置がそれぞれ設けられている。 Next, an injection molding machine 71 in which two or more molds of FIG. 6 according to the present invention are connected in the mold opening / closing direction will be described. The injection molding machine 71 is fixedly provided with a fixed platen 72 at the center, and the fixed platen 72 is provided with an intermediate plate 73 that rotates about a vertical axis. Intermediate molds 74 and 74 are attached to both surfaces of the intermediate plate 73, respectively. Further, on the left side in FIG. 6, a first movable plate 76 that is opened / closed by a first mold opening / closing mechanism 75 with respect to the fixed platen 72 is provided, and the first movable plate 76 has a first movable mold 77. Is installed. Further, on the right side in FIG. 6, a second movable plate 79 that is opened / closed by a second mold opening / closing mechanism 78 with respect to the fixed platen 72 is provided, and the second movable plate 79 has a second movable mold 80. Is installed. A mold clamping device (not shown) is provided, and at the time of mold clamping, one of the intermediate molds 74 and 74 and the first movable mold 77 constitute the molding mold F, and the other of the intermediate molds 74 and 74 is the other. The second movable mold 80 constitutes a molding mold G. In addition, an injection device (not shown) is provided outside each of the first movable plate 76 and the second movable plate 79.
射出成形機71についても型閉時に第1の型開閉機構75および第2の型開閉機構78の図示しないサーボモータのロータリエンコーダ等により、固定盤72に対する第1の可動盤76の位置、固定盤72に対する第2の可動盤79の位置を検出することにより成形金型Fおよび成形金型Gの型厚を測定することができる。測定された型厚は、成形金型Fと成形金型Gではそれぞれキャビティの形状等が異なるから型厚補正手段により型厚寸法の補正が行われる(いずれか一方の型厚寸法については補正しない場合も含む) Also in the injection molding machine 71, the position of the first movable plate 76 with respect to the fixed platen 72, the fixed platen by the rotary encoder of the servo motor (not shown) of the first mold opening / closing mechanism 75 and the second mold opening / closing mechanism 78 when the mold is closed. By detecting the position of the second movable platen 79 with respect to 72, the mold thicknesses of the molding die F and the molding die G can be measured. Since the measured mold thickness is different between the mold F and the mold G, the mold thickness is corrected by the mold thickness correcting means (one of the mold thickness is not corrected). Including cases)
また射出成形機71と同じ配置の型開閉機構が設けられた射出成形機において、79が固定盤であり、73が中間部材、76が可動盤であるものでもよい。 Further, in an injection molding machine provided with a mold opening / closing mechanism having the same arrangement as the injection molding machine 71, 79 may be a fixed platen, 73 may be an intermediate member, and 76 may be a movable platen.
また上記の射出成形機11,51,71において型開閉手段のアクチュエータが油圧シリンダの場合等において、金型位置を検出して型厚寸法を測定する型厚測定手段は、ロータリエンコーダ以外に直線方向の位置を検出可能な変位センサであってもよい。また固定盤と中間盤(回転盤)、中間盤(回転盤)と可動盤といった盤面間の距離を非接触式の超音波センサやレーザーセンサ等のセンサ等により測定するものでもよい。 In the above injection molding machines 11, 51, 71, when the actuator of the mold opening / closing means is a hydraulic cylinder, the mold thickness measuring means for detecting the mold position and measuring the mold thickness dimension is a linear direction other than the rotary encoder. It may be a displacement sensor that can detect the position. Further, the distance between the surface of the fixed plate and the intermediate plate (rotary plate) or the intermediate plate (rotary plate) and the movable plate may be measured by a sensor such as a non-contact ultrasonic sensor or a laser sensor.
更に射出成形機11,51,71において、取付けられる成形金型は、型閉の際にバネが圧縮される成形金型(バネ金型)が少なくとも一つ取付けられるものであってもよい。バネが圧縮される成形金型の場合、型開閉手段により型閉完了位置まで型閉する際に他の成形金型よりも大きな型閉力を必要とする。そのため型閉完了位置を検出するためのトルク制限値等も大きな設定値が必要となる。その結果、型閉完了して型厚寸法を測定する際にはボールねじ等の更に大きな負荷がかかって伸びが発生した状態となる。その結果、型厚測定手段により測定される型厚寸法は実際の値よりも小さくなり、比較的大きな補正値(オフセット値)が必要となる場合が多い。なお型閉の際にバネが圧縮される成形金型(バネ金型)に対応する補正値c(オフセット値)は、別途に記憶手段44に保存しておくようにしてもよい。また射出成形機11の固定側金型用と可動側金型用の補正値a,b(オフセット値)が予め設定されているところに、更にバネ金型を取付ける場合、バネ金型用の補正値c(オフセット値)を更に加算することも想定される。 Further, in the injection molding machines 11, 51, 71, the molding die to be attached may be one in which at least one molding die (spring die) in which a spring is compressed when the die is closed is attached. In the case of a molding die in which the spring is compressed, a mold closing force larger than that of other molding dies is required when the mold is closed to the mold closing completion position by the mold opening / closing means. Therefore, a large set value is also required for a torque limit value for detecting the mold closing completion position. As a result, when the mold thickness is measured after the mold closing is completed, a larger load such as a ball screw is applied to cause elongation. As a result, the mold thickness dimension measured by the mold thickness measuring means is smaller than the actual value, and a relatively large correction value (offset value) is often required. The correction value c (offset value) corresponding to the molding die (spring die) whose spring is compressed when the die is closed may be stored in the storage unit 44 separately. Further, when a spring mold is further mounted at a position where correction values a and b (offset values) for the fixed mold and the movable mold of the injection molding machine 11 are set in advance, correction for the spring mold is performed. It is also assumed that the value c (offset value) is further added.
更に射出成形機11,71において、中間金型18,74を180°回転させる前とさせた後での2回、成形金型Aと成形金型Bの型厚寸法の測定と補正をそれぞれ行うものでもよい。例えば射出成形機11では、中間金型18,18は同一厚みとなるように製造されるが実際には僅かな誤差等があることもあり、中間金型18,18の反転の成形サイクル(奇数回の成形と、偶数回の成形)に応じて制御に用いる型厚寸法を変更してもよい。 Further, in the injection molding machines 11 and 71, the mold thickness dimensions of the molding die A and the molding die B are measured and corrected twice, respectively, before the intermediate molds 18 and 74 are rotated by 180 °. It may be a thing. For example, in the injection molding machine 11, the intermediate molds 18 and 18 are manufactured to have the same thickness, but there may actually be a slight error or the like. The mold thickness dimension used for the control may be changed according to the number of times of molding and the number of times of molding.
また本発明において、特許文献1のように成形時の金型の熱膨張等に対応するために成形途中でも型厚寸法の補正を行ってもよい。型厚寸法の補正は、成形ショット、成形時間、金型温度等を検出して行ってもよく、型閉時の型開閉用のサーボモータのトルクやタイバーセンサ等により型締力を検出して行ってもよい。 In the present invention, as in Patent Document 1, in order to cope with thermal expansion of the mold during molding, the mold thickness dimension may be corrected even during the molding. The mold thickness dimension may be corrected by detecting the molding shot, molding time, mold temperature, etc., and the mold clamping force is detected by the torque of the servo motor for opening and closing the mold and the tie bar sensor. You may go.
本発明については、一々列挙はしないが、上記した本実施形態のものに限定されず、当業者が本発明の趣旨を踏まえて変更を加えたものについても、適用されることは言うまでもないことである。射出成形については、材料は限定されず、射出圧縮成形、発泡成形、サンドイッチ成形、インサート成形などの成形を行うものも含まれる。また本発明は2個以上の金型が縦方向の型開閉方向に連設される縦型射出成形機やプレス成形機であってもよい。 The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and it goes without saying that those skilled in the art also apply modifications made in accordance with the spirit of the present invention. is there. For injection molding, the material is not limited, and includes materials that perform molding such as injection compression molding, foam molding, sandwich molding, and insert molding. Further, the present invention may be a vertical injection molding machine or a press molding machine in which two or more molds are continuously provided in the vertical mold opening / closing direction.
11,51、71 射出成形機
13 型締装置
14,59,77,80 可動金型
15,58,76,79 可動盤
16,53,固定金型
17,52,72 固定盤
18,55,57,74 中間金型
19,57 中間部材
26 可動盤の型開閉手段(型厚測定手段)
27 中間部材の型開閉手段(型厚測定手段)
22 型締シリンダ
28,36 サーボモータ
43 型厚補正手段
44 記憶手段
A,B,C,D,E,F,G 成形金型
11, 51, 71 Injection molding machine 13 Clamping device 14, 59, 77, 80 Movable die 15, 58, 76, 79 Movable platen 16, 53, Fixed die 17, 52, 72 Fixed platen 18, 55, 57 , 74 Intermediate molds 19, 57 Intermediate member 26 Mold opening / closing means (mold thickness measuring means) of movable platen
27 Mold opening / closing means (mold thickness measuring means) for intermediate member
22 Clamping cylinders 28, 36 Servo motor 43 Mold thickness correcting means 44 Storage means A, B, C, D, E, F, G Mold

Claims (5)

  1. 2個以上の成形金型が型開閉方向に連設される射出成形機において、
    直接的または間接的にそれぞれの成形金型の型厚寸法を測定する型厚測定手段と、
    型厚測定手段により測定されたそれぞれの成形金型の型厚寸法に対して個別に補正が可能な型厚補正手段と、
    補正された型厚寸法を保存する記憶手段と、が備えられたことを特徴とする射出成形機。
    In an injection molding machine in which two or more molding dies are continuously provided in the mold opening and closing direction,
    Mold thickness measuring means for directly or indirectly measuring the mold thickness dimension of each molding die;
    Mold thickness correcting means capable of individually correcting the mold thickness dimension of each molding die measured by the mold thickness measuring means;
    An injection molding machine comprising: storage means for storing the corrected mold thickness dimension.
  2. 型閉の際にバネが圧縮される成形金型が少なくとも一つ取付けられることを特徴とする請求項1に記載の射出成形機。 2. The injection molding machine according to claim 1, wherein at least one molding die is attached to which a spring is compressed when the mold is closed.
  3. 型閉の際にバネが圧縮される成形金型に対応する補正値を保存する記憶手段が備えらえたことを特徴とする請求項2に記載の射出成形機。 The injection molding machine according to claim 2, further comprising storage means for storing a correction value corresponding to a molding die whose spring is compressed when the mold is closed.
  4. 2個以上の成形金型が型開閉方向に連設された射出成形機の制御方法において、
    型閉された際にそれぞれの成形金型の型厚寸法を測定し、
    前記の測定された型厚寸法に対して個別に補正を行い、補正された型厚寸法を制御に用いることを特徴とする射出成形機の制御方法。
    In a control method of an injection molding machine in which two or more molding dies are continuously provided in the mold opening / closing direction,
    When the mold is closed, measure the mold thickness of each mold,
    A method for controlling an injection molding machine, wherein the measured mold thickness dimension is individually corrected, and the corrected mold thickness dimension is used for control.
  5. 少なくとも一つの成形金型の型厚寸法の正の補正値を他の成形金型の型厚寸法の正の補正値以上にすることを特徴とする請求項4に記載の射出成形機の制御方法。
    5. The method of controlling an injection molding machine according to claim 4, wherein the positive correction value of the mold thickness dimension of at least one molding die is set to be equal to or greater than the positive correction value of the mold thickness dimension of other molding dies. .
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JPS5346356A (en) * 1976-10-07 1978-04-25 Japan Steel Works Ltd Mold cramping device for injection molder
JPH02171221A (en) * 1988-12-23 1990-07-02 Niigata Eng Co Ltd Injection molding machine
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