JP3172650B2 - Injection press molding method and injection press molding apparatus - Google Patents
Injection press molding method and injection press molding apparatusInfo
- Publication number
- JP3172650B2 JP3172650B2 JP07876395A JP7876395A JP3172650B2 JP 3172650 B2 JP3172650 B2 JP 3172650B2 JP 07876395 A JP07876395 A JP 07876395A JP 7876395 A JP7876395 A JP 7876395A JP 3172650 B2 JP3172650 B2 JP 3172650B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- mold
- mold clamping
- filling
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Press Drives And Press Lines (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【0001】[0001]
【産業上の利用分野】金型を所定の隙間に離間させた状
態で金型キャビティ内へ溶融樹脂を充填し、射出充填完
了後に型締機構により型締して圧縮を行なう射出プレス
成形方法および射出プレス成形装置に関する。BACKGROUND OF THE INVENTION An injection press molding method in which a molten resin is filled into a mold cavity with a mold separated from a predetermined gap, and after the injection and filling is completed, the mold is clamped and compressed by a mold clamping mechanism. The present invention relates to an injection press molding device.
【0002】[0002]
【従来の技術】トグル機構により型締を行なう射出成形
装置を用いて射出プレス成形する場合、(1)トグル機
構が伸び切った状態で型締を完了するとともに、この状
態で金型に所定の隙間を確保しておく。そして溶融樹脂
を金型内に射出充填後、可動盤あるいは固定盤に別途付
設した圧縮専用の油圧シリンダなどにより圧縮を行な
う。(2)トグル式の型締機構では、トグル機構が伸び
切らない状態下で金型に所定の隙間を確保した状態とな
るように、トグル機構のクロスヘッド位置と可動盤の変
位量(型開量、型締力)の幾何学的関係を用いてクロス
ヘッドの位置に換算した設定値に基づく制御によりトグ
ル機構を停止させて型締を行なった後、金型キャビティ
内に射出充填し、その後トグル機構を再駆動により伸び
切った状態にして圧縮を行なう。2. Description of the Related Art When performing injection press molding using an injection molding apparatus that performs mold clamping by a toggle mechanism, (1) mold clamping is completed in a state where the toggle mechanism is fully extended, and in this state, a predetermined amount is applied to a mold. Keep a gap. Then, after the molten resin is injected and filled into the mold, compression is performed by a hydraulic cylinder for compression or the like separately provided on the movable platen or the fixed platen. (2) In the toggle-type mold clamping mechanism, the crosshead position of the toggle mechanism and the displacement of the movable platen (the mold opening amount) are set so that a predetermined gap is secured in the mold while the toggle mechanism is not fully extended. After the toggle mechanism is stopped and the mold is clamped by control based on the set value converted to the position of the crosshead using the geometrical relationship of (amount, mold clamping force), the mold cavity is injected and filled. The compression is performed with the toggle mechanism fully extended by re-driving.
【0003】[0003]
【発明が解決しようとする課題】従来の射出圧縮成形で
は、次のような問題があった。まず、 (1)トグル機構が伸び切った状態で型締を完了し、こ
の状態で金型内に溶融樹脂を射出充填する方法では、 トグル機構側には何ら特別な改造を必要としない
が、トグル機構とは別に圧縮専用の油圧シリンダなどが
必要なため、成形機の複雑・コスト高を招く。 型開量の適正値の設定が難しく、その上、圧縮開始
タイミング設定との整合性を必要とする。また、射出側
と圧縮側との同期制御が必要であることを考えれば、駆
動部が大型化するに伴い制御のソフト面とハード面から
高度化が要求されるため複雑となり、成形の操作性を著
しく低下させることになるといった問題がある。 (2)トグル機構の幾何学的関係により、型開量や型締
力をクロスヘッド位置に換算した設定値で型締を制御す
る方法では、 前記(1)のように、トグル機構とは別に圧縮専
用の油圧シリンダなどを必要としないものの、トグル機
構のクロスヘッド位置と可動盤の変位量、換言すれば型
開量や型締力の幾何学的関係は、取付ける金型の厚さに
応じた型厚設定値と金型の大きさに応じて型締完了時の
最大発生型締力を増減させるダイハイト調整値の組合せ
によって関係式は無限大に存在するため、使用する金型
毎に幾何学的関係に基づいて計算しなければならず操作
性は極めて悪く非実用的である。 仮に、上記トグル機構の幾何学的関係をプログラミ
ングし自動演算処理させる手段を組込んで、無限大に近
い種々の変数の組合せ数を演算処理によって所望の結果
を得ようとすると、ソフト・ハードの複雑でかつ大型化
は避けられずコスト高を招き適切でないといった問題が
ある。 本発明は、上記問題点に鑑みてなされたもので、本発明
の目的は、現行のトグル機構の成形機を大幅に改造する
ことなく、射出圧力と型締シリンダ油圧の圧力制御のみ
の簡単な制御で、高精度な射出プレス成形ができ、安定
して良品を連続的に供給する。The conventional injection compression molding has the following problems. First, (1) In the method in which the mold clamping is completed with the toggle mechanism fully extended and the molten resin is injected and filled in the mold in this state, no special modification is required on the toggle mechanism side. In addition to a toggle mechanism, a dedicated hydraulic cylinder or the like for compression is required, which leads to an increase in complexity and cost of the molding machine. It is difficult to set an appropriate value of the mold opening amount, and further, it needs consistency with the setting of the compression start timing. Also, considering that the injection side and the compression side need to be controlled synchronously, as the drive unit becomes larger, sophistication is required from the software and hardware aspects of the control, which is complicated, and the molding operability is increased. Is significantly reduced. (2) In the method of controlling the mold clamping by a set value obtained by converting the mold opening amount and the mold clamping force into the crosshead position due to the geometric relationship of the toggle mechanism, as described in (1) above, separately from the toggle mechanism. Although there is no need for a dedicated hydraulic cylinder for compression, etc., the geometric relationship between the crosshead position of the toggle mechanism and the displacement of the movable platen, in other words, the mold opening and mold clamping force, depends on the thickness of the mold to be mounted. Since the relational expression is infinite due to the combination of the die height adjustment value that increases or decreases the maximum generated mold clamping force at the completion of mold clamping according to the mold thickness setting value and the size of the mold, the geometrical shape is different for each mold used. Operability is extremely poor and impractical. If the geometrical relationship of the toggle mechanism is programmed and a means for automatic calculation processing is incorporated to obtain a desired result by the calculation processing of the number of combinations of various variables close to infinity, a software and hardware There is a problem in that it is complicated and inevitable to increase the size, which leads to high costs and is not appropriate. The present invention has been made in view of the above problems, and an object of the present invention is to provide a simple control of only the injection pressure and the pressure of the mold clamping cylinder hydraulic pressure without significantly modifying the existing molding machine of the toggle mechanism. Control enables high-precision injection press molding, and stably supplies good products continuously.
【0004】[0004]
【課題を解決するための手段】以上の課題を解決するた
めに、本発明の方法では、あらかじめ樹脂の冷却固化収
縮量を算出したうえ、型締工程では油圧式の型締シリン
ダを駆動してトグル機構を介して金型を型閉する際該冷
却固化収縮量に相当する型開量位置に該トグル機構が伸
び切らない状態で保持し、射出充填工程では該冷却固化
収縮量を加えた樹脂量を金型キャビティ内に充填可能な
射出圧力制御を行なうとともに、射出充填完了の検知後
該トグル機構を伸び切る方向に伸張させて型締力を付加
させることとした。また、第2の発明では、さらに、第
1の発明における射出圧力制御を射出充填開始から射出
充填完了までを充填可能な一定圧力の圧力制御で行な
い、収縮量を残さずにすべて充填するようにした。さら
に、第3の発明では、第1の発明において、あらかじめ
タイバーに組込んだ型締力検出部を用いて両金型がタッ
チした状態を検知してトグル機構に連結される型締シリ
ンダのストロークを原点設定し、樹脂の冷却固化収縮量
に相当する型開量位置を該原点設定位置からの型締シリ
ンダのストローク後退量により設定するとともに、型締
完了後は設定した後退位置に可動金型を保持するように
型締シリンダの油圧を制御することとした。また、第4
の発明では、第1の発明の射出充填完了を射出機構の射
出駆動力が急激に上昇し始めた時点とし、該射出駆動力
の変化の後型締を開始することとした。そして、第5の
発明では、第1の発明の射出充填完了を射出機構の射出
駆動部の移動が停止した時点とし、該射出駆動部の停止
位置への到達の後型締を開始することとした。一方、第
6の発明の射出プレス成形装置においては、射出充填量
設定手段と射出圧力設定手段を備え該両設定手段で設定
された設定値に基づいて射出充填を行なう射出制御部
と、樹脂の冷却固化収縮量に相当する型開量を設定する
型開量設定手段と、金型の型開量を検出する型開量検出
部と、型締シリンダのストロークを検出する型締シリン
ダストロークセンサと、型締工程における金型タッチ点
の検知をタイバーに組込まれた型締力検出部で行ない該
型締力検出部の検出信号に基づいて型締シリンダのスト
ロークを原点設定する金型タッチ点設定部と、前記型開
量設定手段の設定値と前記型開量検出部の検出信号およ
び型締ストロークセンサの検出信号を比較してトグル機
構と連結される型締シリンダのストロークを制御して型
締を行なう型締制御部とを具備するとともに、射出機構
の射出駆動力が急激に上昇し始めた時、あるいは射出駆
動部の移動が停止した時に射出充填完了信号を発信させ
る射出充填完了検出部と、該射出充填完了検出部からの
検出信号に基づいて前記型締制御部へ型締開始信号を発
信させる比較制御部とを有する構成とした。In order to solve the above-mentioned problems, according to the method of the present invention, the amount of cooling, solidification and shrinkage of the resin is calculated in advance, and a hydraulic clamping cylinder is driven in the clamping process. When the mold is closed via the toggle mechanism, the toggle mechanism is held at a mold opening position corresponding to the cooling solidification shrinkage in a state where the toggle mechanism does not extend completely. The injection pressure is controlled so that the amount can be filled in the mold cavity, and after the completion of the injection filling is detected, the toggle mechanism is extended in the direction in which the mold is fully extended to apply a mold clamping force. Further, in the second invention, the injection pressure control in the first invention is performed by a pressure control of a constant pressure capable of filling from the start of the injection filling to the completion of the injection filling, so that all the filling is performed without leaving the contraction amount. did. Further, in a third aspect based on the first aspect, the stroke of the mold clamping cylinder connected to the toggle mechanism by detecting a state in which both molds are touched by using a mold clamping force detector previously incorporated in the tie bar. Is set as the origin, and the mold opening position corresponding to the amount of cooling, solidification, and shrinkage of the resin is set by the stroke retreat amount of the mold clamping cylinder from the origin setting position, and after the mold clamping is completed, the movable mold is moved to the set retracted position. The hydraulic pressure of the mold clamping cylinder is controlled so as to maintain the pressure. Also, the fourth
According to the invention, the injection filling of the first invention is completed when the injection driving force of the injection mechanism suddenly starts increasing, and after the injection driving force changes, the mold clamping is started. In the fifth invention, the completion of the injection filling of the first invention is defined as a point in time when the movement of the injection drive unit of the injection mechanism is stopped, and after the injection drive unit reaches the stop position, mold clamping is started. did. On the other hand, in the injection press molding apparatus of the sixth invention, an injection control unit that includes injection filling amount setting means and injection pressure setting means and performs injection filling based on the set values set by both setting means, A mold opening amount setting means for setting a mold opening amount corresponding to a cooling solidification shrinkage amount, a mold opening amount detecting unit for detecting a mold opening amount of a mold, a mold clamping cylinder stroke sensor for detecting a stroke of a mold clamping cylinder, and A mold touch point setting for detecting a mold touch point in a mold clamping process by a mold clamping force detector incorporated in a tie bar and setting a stroke of a mold clamping cylinder to an origin based on a detection signal of the mold clamping force detector. And comparing the set value of the mold opening amount setting means with the detection signal of the mold opening amount detection unit and the detection signal of the mold clamping stroke sensor to control the stroke of the mold clamping cylinder connected to the toggle mechanism. To tighten An injection / fill completion detecting unit for transmitting an injection / fill completion signal when the injection driving force of the injection mechanism suddenly starts rising or when the movement of the injection driving unit is stopped, and And a comparison control unit for transmitting a mold clamping start signal to the mold clamping control unit based on a detection signal from the filling completion detecting unit.
【0005】[0005]
【作用】射出充填工程時は充填可能な圧力制御とするこ
とで充填初期には金型のキャビティ内の樹脂流動抵抗が
小さいため高速充填となり、充填後期には樹脂流動抵抗
が大きくなるため充填速度は自然減速されるため、樹脂
充填中は自動的に連続的な速度勾配を有し、かつパック
圧を生じない理想的な自然充填流れ(ナチュラルフロ
ー)となり得る。また、樹脂の冷却固化収縮量を加えた
樹脂量を充填し、かつ、樹脂の冷却固化収縮量に相当す
る型開量設定とすることで射出充填完了時においても、
金型へ樹脂はほぼ満充填(ジャストパック)の状態であ
るため、型締開始の切替えに際しても金型内の樹脂流速
の不連続に起因するフローマークなどの欠陥発生の影響
を全く受けない。したがって、従来行なわれてきた型締
開始の複雑かつ高度なタイミング制御が不要となる。さ
らに、型締力の検知をタイバーに組込んだ型締力検出部
で行なっているので、型厚設定、ダイハイト調整の影響
を全く受けず高精度な型締力が直接検出でき、その結
果、型開量の設定に際して基準となる金型のタッチ状態
が高精度に安定して検知でき、型開量の設定が極めて容
易にできる。また、圧縮工程において、射出充填完了を
検知してから型締圧力を増圧させているので射出側と型
締側との連動が避けられるため成形機を大型化しなくて
よい。In the injection filling process, the filling is controlled so that the filling can be performed at a high speed in the initial stage of filling because the flow resistance of the resin in the mold cavity is small, and in the latter stage of the filling, the flow resistance of the resin increases so that the filling speed is increased. Is naturally decelerated, so that the resin has a continuous speed gradient automatically during resin filling, and can be an ideal natural filling flow (natural flow) that does not generate pack pressure. In addition, even when the injection filling is completed by filling the resin amount obtained by adding the cooling solidification shrinkage amount of the resin, and by setting the mold opening amount corresponding to the cooling solidification shrinkage amount of the resin.
Since the mold is almost completely filled with resin (just pack), the switching of the mold clamping start is not affected at all by the occurrence of defects such as flow marks due to the discontinuity of the resin flow velocity in the mold. Therefore, complicated and sophisticated timing control of the mold clamping start conventionally performed becomes unnecessary. In addition, since the mold clamping force is detected by the mold clamping force detector built into the tie bar, highly accurate mold clamping force can be directly detected without being affected by mold thickness setting and die height adjustment. The touch state of the mold as a reference when setting the mold opening amount can be stably detected with high accuracy and the mold opening amount can be set very easily. Further, in the compression step, since the mold clamping pressure is increased after the completion of the injection filling is detected, the interlocking between the injection side and the mold clamping side can be avoided, so that the molding machine does not need to be enlarged.
【0006】[0006]
【実施例】以下、図面に基づいて本発明の実施例の詳細
について説明する。図1〜図2は本発明の実施例に係
り、図1は射出成形機の全体構成図、図2は射出プレス
成形方法の状態説明図である。図1の射出成形機の上半
分は、圧縮工程前の型開量設定時の状態を示し、下半分
は圧縮工程時の型締完了状態を示している。Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 relate to an embodiment of the present invention, FIG. 1 is an overall configuration diagram of an injection molding machine, and FIG. 2 is a state explanatory diagram of an injection press molding method. The upper half of the injection molding machine in FIG. 1 shows a state at the time of setting the mold opening amount before the compression step, and the lower half shows a state of completion of mold clamping during the compression step.
【0007】図1に示すように、射出成形プレスを行な
う射出成形機100は、大別すると型締装置20と射出
装置40と制御部60とから構成され、型締装置20
は、リンクハウジング1、固定盤2、可動盤3、型締シ
リンダ8、トグル機構6(トグルリンク6a、ミッドリ
ンク6b、クロスヘッドリンク6c)、クロスヘッド
7、ピストンロッド9、ガイドロッド10、金型4(可
動金型4a、固定金型4b)、キャビティ5、タイバー
11などから構成される。As shown in FIG. 1, an injection molding machine 100 for performing an injection molding press is roughly composed of a mold clamping device 20, an injection device 40, and a control unit 60.
Are the link housing 1, fixed plate 2, movable plate 3, mold clamping cylinder 8, toggle mechanism 6 (toggle link 6a, mid link 6b, crosshead link 6c), crosshead 7, piston rod 9, guide rod 10, gold It comprises a mold 4 (movable mold 4a, fixed mold 4b), cavity 5, tie bar 11, and the like.
【0008】つぎに、射出装置40について述べる。本
実施例における射出装置40はバレル41内にスクリュ
42が配設され、ホッパ43内の樹脂原料が供給ゾー
ン、圧縮ゾーンにおいて加熱圧縮され、計量ゾーンにお
いて溶融計量され、そして射出ゾーンを経てノズル44
内へ射出されるように構成されている。そして、バレル
41の外周面には樹脂原料を外部加熱するためのヒータ
が設けられており、樹脂原料がスクリュ42の回転によ
って前方へ送られるようになっている。符号46は射出
シリンダ、47は正逆転用モータであってスクリュ42
に直結されており、スクリュ42を正逆回転するように
なっている。Next, the injection device 40 will be described. In the injection device 40 in this embodiment, a screw 42 is provided in a barrel 41, and a resin material in a hopper 43 is heated and compressed in a supply zone and a compression zone, melted and weighed in a measurement zone, and passed through an injection zone to a nozzle 44.
It is configured to be injected into the interior. A heater for externally heating the resin material is provided on the outer peripheral surface of the barrel 41, and the resin material is sent forward by the rotation of the screw 42. Reference numeral 46 denotes an injection cylinder, and 47 denotes a forward / reverse rotation motor.
, So that the screw 42 rotates forward and backward.
【0009】つぎに、制御部60について述べる。制御
部60は射出充填量設定手段61、射出圧力設定手段6
2、射出制御部63、油圧制御弁64、圧力センサ6
5、油圧制御弁67、油圧供給源68a、68b、射出
充填完了検出部69、タイマ70、時間設定部71、比
較制御部72、型締制御部73、型締シリンダストロー
クセンサ74、型開量検出部75、型開量設定手段7
6、型締力検出部77、金型タッチ点設定部78などか
ら構成される。そして、射出充填量設定手段61と射出
圧力設定手段62が射出制御部63に接続され、射出制
御部63は射出シリンダ46の動作を制御する油圧制御
弁64と正逆転用モータ47の動作を制御する図示しな
い制御装置にそれぞれ接続されている。また、射出シリ
ンダ46内の作動油圧が圧力センサ65で検知され、射
出充填完了検出部69、タイマ70、比較制御部72を
経由して型締制御部73へ送られるとともに、型締シリ
ンダストロークセンサ74によって検知される位置情報
と型開量検出部75によって検知される型開量情報とタ
イバー11に組込まれている型締力検出部77で検知さ
れる型締力情報がそれぞれ型開量設定手段へ送信され、
型締制御部へ動作信号が発信され、型締シリンダ8を制
御する油圧制御弁67へ動作指令を与えるようになって
いる。なお、型締力検出部77はタイバー11に組込ま
れ、例えばロードメータなどが使用される。また、型開
量検出部75はエンコーダやリニアスケールが採用さ
れ、可動盤位置で計測される。型締シリンダストローク
センサ74は型締シリンダ8のピストンロッド9に取り
付けられ、エンコーダやリニアスケールが採用される。Next, the control unit 60 will be described. The control unit 60 includes an injection filling amount setting unit 61 and an injection pressure setting unit 6
2. Injection controller 63, hydraulic control valve 64, pressure sensor 6
5. Hydraulic control valve 67, hydraulic supply sources 68a, 68b, injection filling completion detecting section 69, timer 70, time setting section 71, comparison control section 72, mold clamping control section 73, mold clamping cylinder stroke sensor 74, mold opening amount Detector 75, mold opening amount setting means 7
6, a mold clamping force detecting unit 77, a mold touch point setting unit 78, and the like. The injection filling amount setting means 61 and the injection pressure setting means 62 are connected to the injection control section 63, and the injection control section 63 controls the operation of the hydraulic control valve 64 for controlling the operation of the injection cylinder 46 and the operation of the forward / reverse rotation motor 47. Connected to control devices (not shown). The operating oil pressure in the injection cylinder 46 is detected by a pressure sensor 65 and sent to a mold clamping control unit 73 via an injection filling completion detection unit 69, a timer 70, and a comparison control unit 72. The position information detected by 74, the mold opening information detected by the mold opening detecting unit 75, and the mold clamping force information detected by the mold clamping force detecting unit 77 incorporated in the tie bar 11 are respectively set to the mold opening amount. Sent to the means,
An operation signal is transmitted to the mold clamping control unit, and an operation command is given to a hydraulic control valve 67 that controls the mold clamping cylinder 8. Note that the mold clamping force detection unit 77 is incorporated in the tie bar 11, and for example, a load meter or the like is used. The mold opening amount detection unit 75 employs an encoder or a linear scale, and measures the position at the movable platen. The mold clamping cylinder stroke sensor 74 is attached to the piston rod 9 of the mold clamping cylinder 8, and employs an encoder and a linear scale.
【0010】このように構成された射出成形機100に
おける射出プレス成形方法の操作手順について次に説明
する。まず、固定金型4bと可動金型4aで画成される
キャビティ5の容積に樹脂物性に係り算出される樹脂の
冷却固化収縮量を加えた樹脂量を計量値として射出充填
量設定手段61で設定するとともに、キャビティ5内へ
充填可能でバリを発生しない射出充填圧力範囲から射出
効率の最もよい射出圧力条件を射出圧力値として射出圧
力設定手段62で設定する。同時に、設定した計量値お
よび射出圧力値と、キャビティ5の容積およびキャビテ
ィ投影面積から、射出充填完了時に樹脂の冷却固化収縮
量に相当する型開量を型開量設定手段76で設定する。The operation procedure of the injection press molding method in the injection molding machine 100 configured as described above will be described below. First, the injection filling amount setting means 61 sets the resin amount obtained by adding the cooling solidification shrinkage amount of the resin calculated according to the resin physical properties to the volume of the cavity 5 defined by the fixed mold 4b and the movable mold 4a as a measured value. At the same time, the injection pressure setting means 62 sets the injection pressure condition with the highest injection efficiency from the injection filling pressure range in which the cavity 5 can be filled and does not generate burrs. At the same time, based on the set measurement value and injection pressure value, the volume of the cavity 5 and the projected area of the cavity, a mold opening amount corresponding to the amount of cooling, solidification and shrinkage of the resin is set by the mold opening amount setting means 76 when the injection filling is completed.
【0011】すなわち、射出充填完了時に溶融樹脂が金
型4へほぼ満充填されている状態(ジャストパック)を
適正型開量とする。こうすることにより、射出充填完了
から圧縮工程へ移行する際に、樹脂の流動変化が生じな
いためにこれに起因するフローマークなどの欠陥の発生
はなく、射出工程と圧縮工程を連動させる必要はない。
なお、適正型開量よりも大きい型開量設定では、射出充
填完了時には充填した樹脂とキャビティ間に大きな隙間
が生じているため、圧縮工程へ移行した際に樹脂の流動
速度が不連続となり、フローマークなどの欠陥が発生す
る。この場合においては、射出工程と圧縮工程を連動さ
せるなどの極めて制御の難しい成形方法が要求される。
逆に型開量が極端に小さい設定では、キャビティ内の樹
脂の流動抵抗が大きくなるので、ショートショットなど
の成形不良が生じやすくなる。That is, a state in which the molten resin is almost completely filled in the mold 4 when the injection filling is completed (just pack) is defined as an appropriate mold opening amount. By doing so, when transitioning from the completion of injection filling to the compression step, there is no occurrence of defects such as flow marks due to no change in resin flow, and it is not necessary to link the injection step and the compression step. Absent.
In addition, when the mold opening amount is set to be larger than the appropriate mold opening amount, a large gap is generated between the filled resin and the cavity at the time of completion of the injection filling, so that the flow speed of the resin becomes discontinuous when moving to the compression process, Defects such as flow marks occur. In this case, a molding method that is extremely difficult to control, such as linking the injection step and the compression step, is required.
Conversely, if the opening amount of the mold is extremely small, the flow resistance of the resin in the cavity becomes large, and molding defects such as short shots are likely to occur.
【0012】以上述べたような初期設定を完了したあ
と、次に成形動作に入る。成形動作は、図2に示すよう
に、下記の手順にしたがって遂行する。 (1)型開量設定手段76で設定した適正型開量の設定
値に基づいて、型締制御部73は型締シリンダ8の動作
を制御して型締を行なう。 (2)まず、型開量設定の際の原点設定(金型タッチ状
態)を行なう。型締動作中の金型タッチ状態の検知(す
なわち型締力の検知)は、タイバー11に組込まれた型
締力検出部77で行なう。そのメリットは、下記のとお
りである。 トグル機構6の型締力の発生原理であるタイバー1
1の伸延(応力)挙動を直接計測しているので最も計測
精度は高い。 従来のトグル機構6の幾何学的関係に基づいて算出
する方法の場合の欠点(無限大に近い演算プログラムの
蓄積、あくまでも演算推定による精度の低さ)は皆無で
ある。 金型取付部とは無関係の位置なので、取扱性が極め
て良好。After completing the above-described initialization, the molding operation is started. The molding operation is performed according to the following procedure, as shown in FIG. (1) The mold clamping control unit 73 controls the operation of the mold clamping cylinder 8 to perform mold clamping based on the set value of the appropriate mold opening set by the mold opening setting means 76. (2) First, the origin is set at the time of setting the mold opening amount (the mold touch state). The detection of the mold touch state during the mold clamping operation (that is, the detection of the mold clamping force) is performed by the mold clamping force detecting unit 77 incorporated in the tie bar 11. The advantages are as follows. Tie bar 1 which is the principle of generation of mold clamping force of toggle mechanism 6
Since the elongation (stress) behavior of No. 1 is directly measured, the measurement accuracy is the highest. There is no disadvantage in the conventional method of calculating based on the geometric relationship of the toggle mechanism 6 (accumulation of operation programs close to infinity, low accuracy due to operation estimation). Extremely good handling because it is independent of the mold mounting area.
【0013】(3)金型タッチ状態の時の型締シリンダ
ストロークを0点リセットして原点設定する。次に型開
量検出部75で金型4の移動量を検知しながら、適正型
開量の位置まで金型4を後退させる。なお、本実施例で
は以下の理由により、金型4の移動量の検知を可動盤3
で計測した。 型締力は全く発生していない状態であるので、各部
材の変形はほとんどなく、金型4と可動盤3の移動量は
1対1であるため。 金型取付部とは無関係の位置であるので、取扱性が
極めて良好。 (4)適正型開量の位置まで金型4を後退させた時の型
締シリンダ8のストロークを型締シリンダストロークセ
ンサ74で検出し、この検出信号値でもって型開量の制
御を行なう。すなわち、射出充填中は検出信号値をキー
プするように型締シリンダ油圧を制御する(型締シリン
ダ位置保持制御)。ここで、トグル機構6の特性(型締
シリンダストロークが1mm程度変動しても可動盤3の
位置変動は1/数十mm以下であり(図1中Sとtとの
関係)、したがって型開量の設定精度は極めて高い。実
際型締シリンダストロークは1mm〜1/10mmの精
度で保持できる。)により、極めて高精度な型開量制御
が容易にできる。(3) The stroke of the mold closing cylinder in the state of touching the mold is reset to zero and the origin is set. Next, while detecting the amount of movement of the mold 4 by the mold opening detection unit 75, the mold 4 is retracted to the position of the appropriate mold opening. In this embodiment, the detection of the moving amount of the mold 4 is performed by the movable platen 3 for the following reason.
Was measured. Since no mold clamping force is generated, there is almost no deformation of each member, and the amount of movement between the mold 4 and the movable platen 3 is one-to-one. Very easy to handle because it is independent of the mold mounting area. (4) The stroke of the mold clamping cylinder 8 when the mold 4 is retracted to the position of the proper mold opening is detected by the mold clamping cylinder stroke sensor 74, and the amount of mold opening is controlled based on the detected signal value. That is, during injection filling, the hydraulic pressure of the mold clamping cylinder is controlled so as to keep the detected signal value (clamp cylinder position holding control). Here, the characteristics of the toggle mechanism 6 (the position fluctuation of the movable platen 3 is 1 / several tens mm or less even if the mold clamping cylinder stroke fluctuates by about 1 mm (the relationship between S and t in FIG. 1). The accuracy of setting the amount is extremely high, and the actual mold clamping cylinder stroke can be held with an accuracy of 1 mm to 1/10 mm.
【0014】(5 )なお、上記(2 )〜(4 )は、
金型および圧縮工程時の型締力設定値(ダイハイト調整
による)を変更しない限り、成形動作前に1回設定すれ
ばよく、実際の成形動作における型締制御は、型締動作
中に先に設定した適正型開量に相当する型締シリンダ8
のストローク位置になった時点で、型締シリンダ位置
保持制御を行なう。 (6 )型開量設定後、射出充填動作に入る。射出充填
量設定手段61 、射出圧力設定手段62で設定した樹
脂計量値、射出充填圧力の設定値に基づいて射出制御部
63は、充填可能な一定圧力の圧力制御で射出充填を行
なう。すなわち、射出初期にはキャビティ5内の流動抵
抗が小さいので高速充填となり、射出後期にはキャビテ
ィ5内の流動抵抗の増加に伴い、充填速度は自然減速
し、その結果連続的な速度勾配を有し、かつパック圧を
発生しない理想的な自然充填流れ(ナチュラルフロー)
となる。さらに、射出充填工程時には射出シリンダ46
の圧力制御よりスクリュ42が前進限に至るまでのいわ
ゆるクッション量を残さない射切り状態に射出制御され
る。こうすることにより、後述する射出充填完了の確認
のための検知が極めて容易かつ正確となる上に計量およ
び射出充填制御も簡単となる。(5) The above (2) to (4)
Unless the mold and the mold clamping force set value (due to die height adjustment) during the compression process are changed, it may be set once before the molding operation. The mold clamping control in the actual molding operation is performed first during the mold clamping operation. Mold clamping cylinder 8 corresponding to the set appropriate mold opening
When the stroke position is reached, the mold clamping cylinder position holding control is performed. (6) After the mold opening is set, the injection filling operation starts. The injection control unit 63 performs injection filling under pressure control of a constant pressure at which filling is possible, based on the resin metering value set by the injection filling amount setting means 61 and the injection filling pressure setting value set by the injection pressure setting means 62. That is, in the early stage of injection, the flow resistance in the cavity 5 is small, so that high-speed filling is performed. In the late stage of injection, the filling speed is naturally reduced with an increase in the flow resistance in the cavity 5, resulting in a continuous speed gradient. Ideal natural filling flow that does not generate pack pressure
Becomes Further, during the injection filling process, the injection cylinder 46 is used.
Injection control is performed so that the screw 42 does not leave a so-called cushion amount until the screw 42 reaches the forward limit due to the pressure control described above. By doing so, the detection for confirming the completion of injection filling described later is extremely easy and accurate, and the weighing and injection filling control are also simplified.
【0015】(7)射出充填完了後は型締側で圧縮工程
を行なう。ここで、射出充填完了後、金型内の溶融樹脂
はジャストパック状態であるので、充填完了に引続いて
圧縮(型締)を開始すれば、フローマークなどの欠陥の
発生は全くない。なお、圧縮に伴い、射出シリンダ46
内の作動油圧を上昇させれば(ただし射出シリンダ46
は前進しない)ノズル44内からキャビティ5までの通
路中には樹脂が充満されているので、金型内の樹脂の逆
流は完全に防止できる。 (8)射出充填完了検知は前述した射切り状態において
射出シリンダ46内の作動油圧値の変化、あるいは射出
ピストン48の前進動作(射出速度)の変化により求ま
る。すなわち、射出充填開始から射出完了直前までは射
出充填圧力が一定となるようにスクリュ42の前進動作
と合せて射出シリンダ46内の作動油圧値は一定に制御
されているために射出完了時、すなわちスクリュ42が
前進限に達するとスクリュ42の前進動作は停止し、射
出シリンダ46内の作動油圧値は一時的に急激に上昇す
る。したがって、射出シリンダ46内の作動油圧値を検
出することにより射出充填完了が正確に検知できる。し
かしながら、これに限定するものでなくスクリュ42の
前進動作あるいは射出ピストン48の前進動作を停止し
た時を射出充填完了として検知してもよい。さらに、前
記のような射出充填完了を確認検知する方法を組合せて
使うことも可能である。(7) After the injection filling is completed, a compression step is performed on the mold clamping side. Here, since the molten resin in the mold is in a just-packed state after the completion of the injection filling, if compression (mold clamping) is started following the completion of the filling, no defect such as a flow mark is generated. In addition, with the compression, the injection cylinder 46
If the operating oil pressure in the
Since the resin is filled in the passage from the nozzle 44 to the cavity 5, backflow of the resin in the mold can be completely prevented. (8) The detection of the completion of the injection filling is obtained by a change in the operating oil pressure value in the injection cylinder 46 or a change in the forward movement (injection speed) of the injection piston 48 in the above-described cutoff state. That is, since the working oil pressure value in the injection cylinder 46 is controlled to be constant along with the forward movement of the screw 42 so that the injection filling pressure is constant from the start of the injection filling to just before the injection is completed, When the screw 42 reaches the forward limit, the forward movement of the screw 42 stops, and the operating oil pressure value in the injection cylinder 46 temporarily and rapidly rises. Therefore, by detecting the operating oil pressure value in the injection cylinder 46, the completion of the injection filling can be accurately detected. However, the present invention is not limited to this, and when the forward movement of the screw 42 or the forward movement of the injection piston 48 is stopped, the completion of the injection filling may be detected. Furthermore, it is also possible to use a method for confirming and detecting the completion of injection filling as described above in combination.
【0016】(9)こうして射出充填完了検出部69で
射出充填完了を検知すると型締制御部73へ型締開始の
信号を発生させるとともにタイマ70が起動して圧縮工
程を制御するのである。ここで、時間設定部71にあら
かじめ計量開始時間および保圧冷却時間を入力させてお
く。計量開始はゲートシールをする時間を基準とし、シ
ャットオフバルブが組込まれている成形機ではシャット
オフバルブ閉動作完了時間を基準として設定する。保圧
冷却時間は、樹脂温度、金型冷却能力、成形品形状など
によって樹脂の冷却固化時間を算出し、圧縮完了時間と
して設定する。 (10)タイマ70のタイムアウト信号と時間設定部7
1の設定値を比較制御部72で比較して各々の設定値に
達していることが判明すると計量開始信号を射出制御部
63へ出力し、圧縮完了信号を型締制御部73へ出力し
て型開きに引続き製品取出しを行なった後次の成形動作
に入る。 (11)なお、圧縮工程の型締力値は成形品の転写性を
アップさせる目的で付加させるのであって、射出プレス
成形のメリットの1つである型締力の低減化と合せて成
形機の最大型締圧力範囲の中で、例えば成形後の成形品
の転写性を評価して必要最小型締力値をあらかじめ設定
しておく。(9) When the injection / fill completion detecting section 69 detects the completion of the injection / filling operation, a signal of the mold closing start is generated to the mold closing control section 73 and the timer 70 is started to control the compression process. Here, the measurement start time and the holding pressure cooling time are input to the time setting unit 71 in advance. The start of metering is set on the basis of the gate sealing time, and in a molding machine incorporating a shut-off valve, the shut-off valve closing operation completion time is set as a reference. The holding pressure cooling time is calculated as the compression solidification time of the resin based on the resin temperature, the mold cooling capacity, the shape of the molded product, and the like, and set as the compression completion time. (10) Timeout signal of timer 70 and time setting section 7
The set value of 1 is compared by the comparison control unit 72, and when it is found that each set value has been reached, a measurement start signal is output to the injection control unit 63, and a compression completion signal is output to the mold clamping control unit 73. After the product is removed following the mold opening, the next molding operation is started. (11) The value of the mold clamping force in the compression step is added for the purpose of improving the transferability of the molded product, and is combined with the reduction of the mold clamping force which is one of the advantages of injection press molding. Within the maximum mold clamping pressure range, for example, the transferability of the molded article after molding is evaluated, and the necessary minimum mold clamping force value is set in advance.
【0017】[0017]
【発明の効果】以上説明したことからも明らかなよう
に、本発明においては、 射出充填工程および圧縮工程は射出圧力と型締シリ
ンダ油圧の圧力制御のみの簡単な制御方法でよいため操
作性は極めて容易となる。 また、射出充填可能な射出圧力制御とすることで、
製品形状に応じた連続的な速度勾配を有し、パック圧発
生のない、かつ短時間充填が可能な理想的な射出充填制
御が極めて簡単に自動設定できるため、制御の操作性が
極めて容易である。 射出充填完了時においても、溶融樹脂はジャストパ
ック状態であるため、樹脂流れの不連続に起因するフロ
ーマークなどの欠陥発生が皆無となり、その結果、射出
充填工程から圧縮工程切替に際しての極めて高度なタイ
ミング制御が不要となるため、さらに制御の操作性を簡
単にすることができる。 射出充填制御は射出圧力制御とするとともにクッシ
ョン量を残さずに充填することにより、射出充填完了検
知は簡単かつ正確に検出できることと、型締開始制御が
簡単にできることと合せて、射出充填完了以降の圧縮工
程および計量開始などの制御はタイマによる簡単な制御
で可能となり、高品質な成形品を極めて容易な操作で得
ることができる。 型締力の検知を、トグル式型締機構の型締力の発生
原理であるタイバー部で直接行なっているため、計測精
度が極めて高く、いかなる条件の金型サイズあるいは型
締力設定に対して対応可能であるために、制御の操作性
・精度が極めて良好となる。As is apparent from the above description, in the present invention, the injection filling step and the compression step need only be performed by a simple control method of controlling the injection pressure and the mold cylinder pressure, so that the operability is improved. It becomes very easy. In addition, by using injection pressure control that allows injection filling,
The ideal injection filling control that has a continuous speed gradient according to the product shape, does not generate pack pressure, and enables short-time filling can be set very easily and automatically, making control operability extremely easy. is there. Even when the injection filling is completed, the molten resin is in a just-packed state, so that there is no defect such as a flow mark caused by the discontinuity of the resin flow. Since timing control is not required, operability of control can be further simplified. Injection filling control is injection pressure control and filling is performed without leaving a cushion amount, so that injection filling completion detection can be detected easily and accurately, and mold clamping start control can be simplified. The control of the compression process and the start of weighing can be performed by simple control using a timer, and a high-quality molded product can be obtained by an extremely easy operation. Since the mold clamping force is detected directly at the tie bar, which is the principle of the mold clamping force of the toggle mold clamping mechanism, the measurement accuracy is extremely high, and the mold clamping force can be set under any conditions. Because it can be handled, the operability and accuracy of the control are extremely good.
【図1】本発明の実施例に係る射出成形機の全体構成図
である。FIG. 1 is an overall configuration diagram of an injection molding machine according to an embodiment of the present invention.
【図2】本発明の実施例に係る射出プレス成形方法の状
態説明図である。FIG. 2 is a state explanatory view of an injection press molding method according to an example of the present invention.
1 リンクハウジング 2 固定盤 3 可動盤 4 金型 4a 可動金型 4b 固定金型 5 キャビティ 6 トグル機構 7 クロスヘッド 8 型締シリンダ 9 ピストンロッド 10 ガイドロッド 11 タイバー 20 型締装置 40 射出装置 41 バレル 42 スクリュ 43 ホッパ 44 ノズル 46 射出シリンダ 47 正逆転用モータ 48 ピストン 60 制御部 61 射出充填量設定手段 62 射出圧力設定手段 63 射出制御部 64 油圧制御弁 65 圧力センサ 67 油圧制御弁 68a、68b 油圧供給源 69 射出充填完了検出部 70 タイマ 71 時間設定部 72 比較制御部 73 型締制御部 74 型締シリンダストロークセンサ 75 型開量検出部 76 型開量設定手段 77 型締力検出部 78 金型タッチ点設定部 100 射出成形機 DESCRIPTION OF SYMBOLS 1 Link housing 2 Fixed board 3 Movable board 4 Mold 4a Movable mold 4b Fixed mold 5 Cavity 6 Toggle mechanism 7 Crosshead 8 Mold clamping cylinder 9 Piston rod 10 Guide rod 11 Tie bar 20 Mold clamping device 40 Injection device 41 Barrel 42 Screw 43 Hopper 44 Nozzle 46 Injection cylinder 47 Forward / reverse rotation motor 48 Piston 60 Control unit 61 Injection filling amount setting unit 62 Injection pressure setting unit 63 Injection control unit 64 Hydraulic control valve 65 Pressure sensor 67 Hydraulic control valve 68a, 68b Hydraulic supply source 69 Injection and filling completion detection unit 70 Timer 71 Time setting unit 72 Comparison control unit 73 Mold clamping control unit 74 Mold clamping cylinder stroke sensor 75 Mold opening detection unit 76 Mold opening setting means 77 Mold clamping force detection unit 78 Mold touch point Setting unit 100 Injection molding machine
Claims (6)
したうえ、型締工程では油圧式の型締シリンダを駆動し
てトグル機構を介して金型を型閉する際該冷却固化収縮
量に相当する型開量位置に該トグル機構が伸び切らない
状態で保持し、射出充填工程では該冷却固化収縮量を加
えた樹脂量を金型キャビティ内に充填可能な射出圧力制
御を行なうとともに、射出充填完了の検知後該トグル機
構を伸び切る方向に伸張させて型締力を付加させること
を特徴とする射出プレス成形方法。1. The amount of cooling, solidification, and shrinkage of a resin is calculated in advance, and is equivalent to the amount of cooling, solidification, and shrinkage when a mold is closed via a toggle mechanism by driving a hydraulic clamping cylinder in a mold clamping process. In the injection filling process, the injection mechanism controls the injection pressure so that the amount of resin plus the amount of cooling, solidification, and shrinkage can be filled in the mold cavity. An injection press molding method, wherein after the completion is detected, the toggle mechanism is extended in a direction in which the toggle mechanism is fully extended to apply a mold clamping force.
填開始から射出充填完了までを充填可能な一定圧力の圧
力制御で行ない、収縮量を残さずにすべて充填すること
を特徴とする射出プレス成形方法。2. The injection press according to claim 1, wherein the injection pressure is controlled from a start of the injection filling to a completion of the injection filling by a pressure control of a constant pressure capable of filling, and the filling is performed without leaving a contraction amount. Molding method.
出部を用いて両金型がタッチした状態を検知してトグル
機構に連結される型締シリンダのストロークを原点設定
し、樹脂の冷却固化収縮量に相当する型開量位置を該原
点設定位置からの型締シリンダのストローク後退量によ
り設定するとともに、型締完了後は設定した後退位置に
可動金型を保持するように型締シリンダの油圧を制御す
ることを特徴とする請求項1記載の射出プレス成形方
法。3. Using a mold clamping force detector incorporated in a tie bar in advance, detecting a state in which both molds are touched, setting the stroke of a mold clamping cylinder connected to a toggle mechanism to an origin, and cooling and solidifying the resin. The mold opening position corresponding to the contraction amount is set by the stroke retracting amount of the mold clamping cylinder from the origin setting position, and after the mold clamping is completed, the mold clamping cylinder is moved so as to hold the movable mold at the set retracted position. The injection press molding method according to claim 1, wherein the hydraulic pressure is controlled.
の射出駆動力が急激に上昇し始めた時点とし、該射出駆
動力の変化の後型締を開始する射出プレス成形方法。4. An injection press molding method according to claim 1, wherein the completion of the injection filling is defined as a point in time when the injection driving force of the injection mechanism starts to rise rapidly, and after the injection driving force changes, the mold clamping is started.
の射出駆動部の移動が停止した時点とし、該射出駆動部
の停止位置への到達の後型締を開始する射出プレス成形
方法。5. The injection press molding method according to claim 1, wherein the completion of the injection filling is defined as a point in time when the movement of the injection driving unit of the injection mechanism is stopped, and the mold clamping is started after the injection driving unit reaches the stop position.
を備え該両設定手段で設定された設定値に基づいて射出
充填を行なう射出制御部と、樹脂の冷却固化収縮量に相
当する型開量を設定する型開量設定手段と、金型の型開
量を検出する型開量検出部と、型締シリンダのストロー
クを検出する型締シリンダストロークセンサと、型締工
程における金型タッチ点の検知をタイバーに組込まれた
型締力検出部で行ない該型締力検出部の検出信号に基づ
いて型締シリンダのストロークを原点設定する金型タッ
チ点設定部と、前記型開量設定手段の設定値と前記型開
量検出部の検出信号および型締ストロークセンサの検出
信号を比較してトグル機構と連結される型締シリンダの
ストロークを制御して型締を行なう型締制御部とを具備
するとともに、射出機構の射出駆動力が急激に上昇し始
めた時、あるいは射出駆動部の移動が停止した時に射出
充填完了信号を発信させる射出充填完了検出部と、該射
出充填完了検出部からの検出信号に基づいて前記型締制
御部へ型締開始信号を発信させる比較制御部とを有する
射出プレス成形装置。6. An injection control unit comprising injection filling amount setting means and injection pressure setting means for performing injection filling based on the set values set by the both setting means , and a mold opening corresponding to the amount of cooling, solidification and shrinkage of the resin. Mold opening amount setting means for setting an amount, a mold opening amount detecting unit for detecting a mold opening amount of a mold, a mold clamping cylinder stroke sensor for detecting a stroke of a mold clamping cylinder, and a mold touch point in a mold clamping process. A mold touch point setting unit for detecting the position of the mold by setting a stroke of a mold clamping cylinder based on a detection signal of the mold clamping force detection unit, the mold opening setting unit; And a mold clamping control unit that performs mold clamping by controlling the stroke of a mold clamping cylinder connected to a toggle mechanism by comparing the set value of the mold opening detection unit and the detection signal of the mold clamping stroke sensor. Equipped and injection When the injection driving force of the mechanism suddenly starts to increase or when the movement of the injection driving unit stops, an injection filling completion detection unit that transmits an injection filling completion signal, and based on a detection signal from the injection filling completion detection unit. And a comparison control unit for transmitting a mold clamping start signal to the mold clamping control unit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07876395A JP3172650B2 (en) | 1995-04-04 | 1995-04-04 | Injection press molding method and injection press molding apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07876395A JP3172650B2 (en) | 1995-04-04 | 1995-04-04 | Injection press molding method and injection press molding apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08276476A JPH08276476A (en) | 1996-10-22 |
JP3172650B2 true JP3172650B2 (en) | 2001-06-04 |
Family
ID=13670948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP07876395A Expired - Fee Related JP3172650B2 (en) | 1995-04-04 | 1995-04-04 | Injection press molding method and injection press molding apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3172650B2 (en) |
-
1995
- 1995-04-04 JP JP07876395A patent/JP3172650B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH08276476A (en) | 1996-10-22 |
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