JP2003127196A - Dwell control method for injection molding machine - Google Patents

Dwell control method for injection molding machine

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Publication number
JP2003127196A
JP2003127196A JP2001321979A JP2001321979A JP2003127196A JP 2003127196 A JP2003127196 A JP 2003127196A JP 2001321979 A JP2001321979 A JP 2001321979A JP 2001321979 A JP2001321979 A JP 2001321979A JP 2003127196 A JP2003127196 A JP 2003127196A
Authority
JP
Japan
Prior art keywords
pressure
holding
time
screw
low speed
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.)
Granted
Application number
JP2001321979A
Other languages
Japanese (ja)
Other versions
JP3875060B2 (en
Inventor
Manabu Sasane
学 笹根
Makoto Yukihiro
誠 行広
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP2001321979A priority Critical patent/JP3875060B2/en
Publication of JP2003127196A publication Critical patent/JP2003127196A/en
Application granted granted Critical
Publication of JP3875060B2 publication Critical patent/JP3875060B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To curtail an unnecessary time in a dwelling pressure application step. SOLUTION: A dwell completion switching operation SW8 is automatically set by a control unit 14 so that a dwell speed switching mode is executed (step S1). A low speed value (X) is set at a low speed value (X) setting part 9, and a molding process is initiated (step S2). It is judged whether or not a molded product is a good product (step S3). When it is judged as a good product, a molding process to complete a dwell pressure application step by turning loose a dwell pressure through setting the advancing speed of a screw 6 at the low speed value (X), is repeated 'n' times. When the molding process is repeated 'n' times, it is judged whether the dispersion of the dwell time has occurred (step S4), and when the dispersion of the dwell time falls within a tolerable range, a continuous molding process is performed in such a way that the advancing speed of the screw 6 reaches the low speed value (X), thereby turning the dwell pressure loose to complete the dwell pressure application step (step S5).

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、射出成形機の保圧
制御方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding pressure control method for an injection molding machine.

【0002】[0002]

【従来の技術】射出成形は、概ね、金型を閉じる型閉じ
工程と、金型を締め付ける型締め工程と、金型のスプル
にノズルを押しつけるノズルタッチ工程、シリンダ内の
スクリュを前進させて、スクリュ前方に溜まった溶融樹
脂を金型内に射出する射出工程と、その後、気泡、ヒケ
の発生を抑制するために保圧圧力をしばらくかける保圧
工程と、金型内に充填された樹脂が冷却されて固まるま
での間の時間に次のサイクルのために、スクリュを回転
させ、かつ、樹脂を溶解しながらシリンダの前方に溶解
樹脂をため込む可塑化工程と、ノズル先端に溜まった溶
解樹脂が金型により冷却固化されないように射出装置を
後退させる射出装置後退工程と、固化された成形品を金
型から取り出すために、金型を開き、成形品を金型に設
けられた突出しピンによって押し出す型開き・成形品突
出し工程とからなる。
2. Description of the Related Art Injection molding generally includes a mold closing process of closing a mold, a mold clamping process of clamping the mold, a nozzle touch process of pressing a nozzle against a sprue of the mold, and a screw in a cylinder being advanced. The injection process of injecting the molten resin accumulated in the front of the screw into the mold, the pressure holding process of applying a holding pressure for a while to suppress the generation of bubbles and sink marks, and the resin filled in the mold For the next cycle in the time between cooling and solidifying, the screw is rotated and the plasticizing process that accumulates the molten resin in front of the cylinder while melting the resin and the molten resin accumulated at the nozzle tip The injection device retracting step of retracting the injection device so that it is not cooled and solidified by the mold, and in order to take out the solidified molded product from the mold, the mold is opened and the molded product is provided with a protruding pin. Consisting of a mold opening-molded article ejection extruding by.

【0003】上記各工程のうち、射出保圧工程に要する
時間は、従来、射出速度で決まる射出時間と保圧圧力を
保持する保圧時間とで制御されるのが一般的であるが、
特に決められた時間はなく、成形技術者にて任意に設定
できるようにしている。
Of the above-mentioned processes, the time required for the injection pressure-holding process is conventionally controlled by the injection time determined by the injection speed and the pressure-holding time for holding the pressure-holding pressure.
There is no specific time, and the molding engineer can set it arbitrarily.

【0004】図4に、従来の射出保圧工程における、射
出ストローク・時間と、射出圧力・速度の関係を表すグ
ラフを示す。
FIG. 4 is a graph showing the relationship between the injection stroke / time and the injection pressure / speed in the conventional injection pressure-holding process.

【0005】射出保圧工程は、成形品の約9割近くを充
填する射出工程と、残りの約1割を充填する保圧工程と
からなる。保圧工程切換点で、射出工程から保圧工程に
移行すると、スクリュは低速で前進され、予め設定され
た時間だけ保圧がかけられる。
The injection pressure-holding step is composed of an injection step of filling about 90% of the molded product and a pressure-holding step of filling the remaining about 10%. At the pressure-holding process switching point, when the injection process shifts to the pressure-holding process, the screw is advanced at a low speed, and the pressure is applied for a preset time.

【0006】この保圧工程は、成形品の品質にとって最
も重要とされている。例えば、通常成形品に使用される
ダイレクトゲートでは、保圧圧力の設定が高い状態で保
圧時間が長ければ、成形品内部に残留ヒズミを生じ、耐
久性&耐熱性などの特性を低下させたり、薄肉成形品で
あれば、ソリの発生に繋がっていた。その逆に、保圧時
間が短ければ、未充填やヒケの現象が発生するなど、成
形品のゲート形状に依存し、成形技術者の経験値を必要
とするものである。
This pressure holding step is considered to be the most important for the quality of the molded product. For example, in a direct gate that is usually used for molded products, if the holding pressure is set high and the holding time is long, residual flaws may occur inside the molded product, and characteristics such as durability and heat resistance may deteriorate. If it is a thin-walled molded product, it has led to the generation of warpage. On the contrary, if the holding time is short, the phenomenon such as non-filling or sink marks occurs, and it depends on the gate shape of the molded product and requires the experience value of the molding engineer.

【0007】[0007]

【発明が解決しようとする課題】従来の射出保圧工程に
おける保圧工程の保圧時間は、個々の成形技術者による
経験値で設定しているが、図4に示したように、スクリ
ュが停止するまでの時間t2よりも保圧時間t1の設定が
長く、成形品に対する最適な保圧時間の設定がなされて
いない場合があった。
The pressure holding time of the pressure holding process in the conventional injection pressure holding process is set by an empirical value by an individual molding engineer. However, as shown in FIG. In some cases, the pressure holding time t 1 is set longer than the time t 2 before stopping, and the optimum pressure holding time for the molded product is not set.

【0008】射出保圧時間はプロセスコントローラにて
任意に設定できるため、成形品の品質を加味して時間短
縮を実施しているが、保圧時間の長短に伴う残留ヒズ
ミ、耐久性&耐熱性などの特性低下、ソリの発生、ある
いは未充填やヒケといった問題をなくすため、実際はト
ライ&エラーを繰返していた。
Since the injection pressure holding time can be arbitrarily set by the process controller, the time is shortened by taking the quality of the molded product into consideration. However, the residual flaw, durability and heat resistance due to the length of the pressure holding time are shortened. In order to eliminate problems such as characteristic deterioration, warpage, unfilling and sink marks, in practice, trial and error were repeated.

【0009】そこで、本発明は、保圧工程におけるムダ
時間を削減し、成形品の品質上のバラツキ低減と生産性
の向上を図ることが可能な射出成形機の保圧制御方法を
提供することを目的とする。
Therefore, the present invention provides a pressure holding control method for an injection molding machine, which can reduce waste time in the pressure holding process, reduce variations in quality of molded products, and improve productivity. With the goal.

【0010】[0010]

【課題を解決するための手段】上記目的を達成するた
め、本発明の射出成形機の保圧制御方法は、スクリュの
前方に溜まったシリンダ内の溶融樹脂を、前記スクリュ
を前進させることで金型内に射出した後に、前記金型内
に射出された樹脂に対して保圧圧力を印加する保圧工程
を含む、射出成形機の保圧制御方法において、前記保圧
工程にて、スクリュ(6)の前進速度が所定の低速値
(X)に到達した時点で前記保圧圧力を解放することを
特徴とする。
In order to achieve the above-mentioned object, a method for controlling the holding pressure of an injection molding machine according to the present invention is a method in which molten resin in a cylinder accumulated in front of a screw is advanced by moving the screw forward. In a pressure-holding control method for an injection molding machine, which includes a pressure-holding step of applying a pressure-holding pressure to the resin injected into the mold after being injected into the mold, the screw ( The holding pressure is released when the forward speed of 6) reaches a predetermined low speed value (X).

【0011】上記の通りの本発明の射出成形機の保圧制
御方法は、スクリュ(6)の前進速度が所定の低速値
(X)に到達した時点で保圧圧力を解放する。つまり、
スクリュ(6)の前進速度が予め設定しておいた低速値
(X)に達した時点で保圧工程を終了させるため、必要
以上の保圧時間、すなわち、ムダ時間を削減することが
できる。
According to the holding pressure control method for the injection molding machine of the present invention as described above, the holding pressure is released when the forward speed of the screw (6) reaches a predetermined low speed value (X). That is,
Since the pressure-holding process is terminated when the forward speed of the screw (6) reaches a preset low speed value (X), the pressure-holding time longer than necessary, that is, the waste time can be reduced.

【0012】また、本発明の射出成形機の保圧制御方法
は、保圧工程が開始された時点から、スクリュ(6)の
前進速度が低速値(X)に到達するまでの時間を測定す
る測定工程と、測定工程後の保圧工程にて、測定工程で
測定した時間が満了した時点で保圧圧力を解放する工程
を含むものであってもよい。例えば、スクリュ(6)の
前進速度が低速値(X)に到達するまでの時間にばらつ
きを生じてしまう場合には、スクリュ(6)の前進速度
が低速値(X)に到達するまでの時間を測定しておき、
この測定した時間が満了した時点で保圧工程を終了させ
る、この工程を選択することで低速値(X)に到達する
までの時間のばらつきの影響を受けずに、成形に要する
時間を安定させることができる。
Further, in the pressure holding control method for the injection molding machine of the present invention, the time from the time when the pressure holding process is started until the forward speed of the screw (6) reaches the low speed value (X) is measured. It may include a step of releasing the holding pressure when the time measured in the measuring step has expired in the holding step after the measuring step. For example, when the time until the forward speed of the screw (6) reaches the low speed value (X) varies, the time until the forward speed of the screw (6) reaches the low speed value (X) Is measured,
The pressure-holding step is terminated when the measured time has expired. By selecting this step, the time required for molding is stabilized without being affected by the variation in the time until the low speed value (X) is reached. be able to.

【0013】また、本発明の射出成形機の保圧制御方法
は、保圧圧力を印加する時間を予め任意に設定する保圧
時間設定工程と、保圧工程にて、保圧時間設定工程で設
定した時間が満了した時点で保圧圧力を解放する工程と
を含むものであってもよい。すなわち、本発明の射出成
形機の保圧制御方法は、保圧時間を任意に設定し、この
設定した時間が満了した時点で保圧工程を終了させるこ
ともできるため、成形技術者が成形品の品質を加味した
経験値による保圧時間を設定することが可能となり、厚
肉成形品等の成形にも対応することができる。
Further, the holding pressure control method for the injection molding machine according to the present invention comprises a holding pressure setting step of arbitrarily setting a holding pressure applying time in advance, and a holding pressure setting step of the holding pressure setting step. And a step of releasing the holding pressure at the time when the set time has expired. That is, in the pressure holding control method for the injection molding machine of the present invention, the pressure holding time can be arbitrarily set, and the pressure holding step can be terminated when the set time expires. It becomes possible to set the pressure holding time based on an empirical value that takes into account the quality of, and it is possible to cope with the molding of thick-walled molded products.

【0014】[0014]

【発明の実施の形態】次に、本発明の実施の形態につい
て図面を参照して説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

【0015】図1に、本発明の一実施形態である射出成
形機の射出装置の概略構成図を示す。
FIG. 1 is a schematic configuration diagram of an injection device of an injection molding machine which is an embodiment of the present invention.

【0016】射出成形機の射出装置は、シリンダ5と、
シリンダ5内に供給する樹脂を貯留しているホッパ15
と、シリンダ5内に回転可能に挿入されているスクリュ
6と、このスクリュ6をスクリュ6の軸方向に移動させ
ることで樹脂を不図示の金型内に射出させる射出サーボ
モータ4、射出サーボモータ4を制御するためのプロセ
スコントローラ1を有する制御部14等から構成されて
いる。
The injection device of the injection molding machine comprises a cylinder 5 and
A hopper 15 that stores the resin to be supplied into the cylinder 5.
And a screw 6 rotatably inserted in the cylinder 5, and an injection servo motor 4 and an injection servo motor for injecting resin into a mold (not shown) by moving the screw 6 in the axial direction of the screw 6. The control unit 14 has a process controller 1 for controlling the control unit 4 and the like.

【0017】スクリュ6は、射出サーボモータ4がタイ
ミングベルト3を介してボールネジ16を回転させるこ
とでスクリュ6の軸方向への移動がなされる構成となっ
ている。また、スクリュ6の先端には、樹脂を射出する
際、樹脂がシリンダ5内に逆流してくるのを防止するた
めの逆流防止リング7が取付けられている。
The screw 6 is constructed so that the injection servomotor 4 rotates the ball screw 16 via the timing belt 3 to move the screw 6 in the axial direction. A backflow prevention ring 7 is attached to the tip of the screw 6 to prevent the resin from flowing back into the cylinder 5 when the resin is injected.

【0018】制御部14は、プロセスコントローラ1の
他に、プロセスコントローラ1に接続されている、保圧
完了切換SW8、低速値(X)設定部9、良品SW1
0、速度比較部12、および時間測定演算部13を有
し、金型内に射出された樹脂に対して印加される保圧圧
力等を制御する。
In addition to the process controller 1, the control unit 14 is connected to the process controller 1, the holding pressure completion switching SW 8, the low speed value (X) setting unit 9, and the non-defective product SW1.
0, a speed comparison unit 12, and a time measurement calculation unit 13, and controls the holding pressure applied to the resin injected into the mold.

【0019】なお、低速値(X)とは、保圧工程におい
て、保圧圧力を解放するための閾値となる、実際に成形
品の中に充填される樹脂の速度、すなわち間接的なスク
リュ6の前進速度であり、本実施形態では、0〜0.5
mm/secの範囲内である。
The low speed value (X) is the speed of the resin actually filled in the molded product, which is a threshold value for releasing the holding pressure in the pressure holding step, that is, the indirect screw 6 Forward speed of 0 to 0.5 in the present embodiment.
It is within the range of mm / sec.

【0020】保圧完了切換SW8は、低速値(X)に基
づいて保圧を終了させる工程を経てから連続成形を実施
する保圧速度切換と、成形技術者の経験値に基づき保圧
時間を設定し、この設定した保圧時間に基づいて保圧を
終了させる工程を経てから連続成形を実施する保圧時間
切換との2つのモードの切換が可能なスイッチである。
本実施形態においては、保圧完了切換SW8は、予め保
圧速度切換が自動的に設定されているが、例えば、厚肉
成形品等を製造する際には、この設定を解除し、保圧時
間切換に切り換えておくことも可能である。
The pressure-holding completion switching switch SW8 switches the pressure-holding speed at which continuous molding is performed after the pressure-holding is terminated based on the low speed value (X), and the pressure-holding time is set based on the experience value of the molding engineer. This is a switch that can be switched between two modes, that is, a pressure-holding time is changed after performing a step of setting the pressure-holding time based on the set pressure-holding time and then performing continuous molding.
In the present embodiment, the pressure-holding completion switching SW8 is automatically set in advance to switch the pressure-holding speed. However, for example, when manufacturing a thick-walled molded product, this setting is released to hold the pressure It is also possible to switch to time switching.

【0021】低速値(X)設定部9では、0〜0.5m
m/secの範囲内で低速値(X)を設定可能である。
なお、低速値(X)は、必要に応じて0〜0.5mm/
sec以外の速度範囲としてもよい。
In the low speed value (X) setting unit 9, 0 to 0.5 m
The low speed value (X) can be set within the range of m / sec.
The low speed value (X) is 0 to 0.5 mm /
It may be a speed range other than sec.

【0022】良品SW10は、保圧速度切換のモードに
おいて、スクリュ6の前進速度が低速値(X)に到達す
ることで保圧圧力を解放する第1のモードと、低速値
(X)に到達するまでの時間を、速度比較部12および
時間測定演算部13により測定算出し、この測定した時
間が満了した時点で保圧圧力を解放する第2のモードと
に切り換えが可能なスイッチである。
The non-defective product SW10 reaches the low speed value (X) and the first mode in which the forward pressure speed of the screw 6 reaches the low speed value (X) to release the holding pressure in the pressure holding speed switching mode. This is a switch that can be switched to a second mode in which the time until it is measured is calculated by the speed comparison unit 12 and the time measurement calculation unit 13 and the holding pressure is released when the measured time expires.

【0023】すなわち、成形された成形品が良品であ
り、かつn回成形した際、保圧時間にバラツキがない場
合は、入力した低速値(X)にスクリュ6の前進速度が
到達した時点で保圧を終了させる第1のモードとすれば
よいが、一方、成形された成形品自体が良品であるにも
拘わらず、保圧時間にバラツキを生じてしまう場合は、
成形に要する時間を安定させるために、良品SW10を
第2のモードに切り換え、低速値(X)に到達するまで
の時間を測定し、この時間が満了した時点で保圧圧力を
解放する。
That is, if the molded product is a good product and there is no variation in the holding time when molded n times, when the forward speed of the screw 6 reaches the input low speed value (X). The first mode for terminating the holding pressure may be used, but on the other hand, when the holding time varies even though the molded product itself is a good product,
In order to stabilize the time required for molding, the non-defective product SW10 is switched to the second mode, the time until reaching the low speed value (X) is measured, and the holding pressure is released when this time expires.

【0024】なお、保圧時間のバラツキは、 スクリュ6の回転後のスクリュ6の先端部に溜めた樹
脂の絶対質量が、特にスクリュ6の回転後の待機時間と
サックバック量によりばらつく、 樹脂の混練状態によるシリンダ5内の樹脂圧が変動
し、逆流防止リング7前後の圧力差によりスクリュ6の
先端部に流れ込み、樹脂の絶対質量がばらつく、 射出速度の成形条件(超低速)によっては、逆流防止
リング7と逆流防止リング7を押さえる不図示のオシガ
ネのシール速度がばらつきスクリュ6の先端部に溜める
樹脂の絶対質量がばらつく、といった、スクリュ6の先
端部に溜める樹脂の絶対質量のバラツキに起因する。
The pressure holding time varies because the absolute mass of the resin accumulated at the tip of the screw 6 after the rotation of the screw 6 varies depending on the waiting time after the rotation of the screw 6 and the suck back amount. The resin pressure in the cylinder 5 fluctuates due to the kneading state and flows into the tip of the screw 6 due to the pressure difference around the backflow prevention ring 7, and the absolute mass of the resin varies. Due to variations in the absolute mass of the resin accumulated at the tip of the screw 6, such as the sealing speed of the unillustrated rod holding the prevention ring 7 and the backflow prevention ring 7 varies, and the absolute mass of the resin accumulated at the tip of the screw 6 varies. To do.

【0025】ここで、保圧時間の測定に関して概略を説
明する。
Here, the outline of the measurement of the pressure holding time will be described.

【0026】本実施形態の射出成形機は、保圧切換点
(図3参照)以降のスクリュ6の前進速度より保圧時間
を求めている。
In the injection molding machine of this embodiment, the pressure holding time is obtained from the forward speed of the screw 6 after the pressure holding switching point (see FIG. 3).

【0027】まず、射出サーボモータ4に設けられたエ
ンコーダ11による位置パルスをサーボアンプ2での演
算処理によりスクリュ6の速度を算出し、この算出値を
速度比較部12に送信する。
First, the speed of the screw 6 is calculated by the arithmetic processing in the servo amplifier 2 of the position pulse by the encoder 11 provided in the injection servomotor 4, and the calculated value is transmitted to the speed comparison unit 12.

【0028】速度比較部12では、低速値(X)設定部
9で予め設定しておいた低速値(X)と、サーボアンプ
2で算出された速度値との比較を行い、サーボアンプ2
で算出された速度値が低速値(X)に到達したら、スク
リュ6を停止させるストップ信号をプロセスコントロー
ラ1に送信する。
The speed comparing section 12 compares the low speed value (X) preset by the low speed value (X) setting section 9 with the speed value calculated by the servo amplifier 2, and the servo amplifier 2
When the speed value calculated in step 1 reaches the low speed value (X), a stop signal for stopping the screw 6 is transmitted to the process controller 1.

【0029】時間測定演算部13では、プロセスコント
ローラ1から、射出工程の終了の信号をスタート信号と
して受信するとともに、上述のようにして得たストップ
信号を受信し、スタート信号を受信してからストップ信
号を受けるまでの間の時間を保圧時間として算出する。
The time measuring / calculating section 13 receives from the process controller 1 a signal indicating the end of the injection process as a start signal, receives the stop signal obtained as described above, and then stops after receiving the start signal. The time until the signal is received is calculated as the pressure holding time.

【0030】プロセスコントローラ1は、保圧完了切換
SW8、低速値(X)設定部9、および良品SW10か
らの信号を入力することで、プロセスコントローラ1内
の機能を利用して、本実施形態の保圧制御を行うための
出力信号を出力し、この信号はサーボアンプ2を介して
射出サーボモータ4に伝えられる。
The process controller 1 inputs the signals from the pressure-holding completion switching SW 8, the low speed value (X) setting section 9 and the non-defective product SW 10 to utilize the functions in the process controller 1 to realize the function of the present embodiment. An output signal for performing the pressure holding control is output, and this signal is transmitted to the injection servo motor 4 via the servo amplifier 2.

【0031】次に、図2に示す本発明の保圧制御方法の
一例のフローチャートを用いて、保圧制御方法について
説明する。
Next, the pressure holding control method will be described with reference to the flow chart of an example of the pressure holding control method of the present invention shown in FIG.

【0032】本実施形態においては、制御部14の保圧
完了切換SW8は、保圧速度切換のモードを実行するよ
うに自動的に設定されている(ステップS1)。なお、
上述したように、この設定は解除可能であり、必要であ
れば従来の保圧時間切換に切り換えることも可能であ
る。
In the present embodiment, the pressure-holding completion switching SW8 of the controller 14 is automatically set to execute the mode of pressure-holding speed switching (step S1). In addition,
As described above, this setting can be canceled, and if necessary, the conventional pressure holding time can be switched.

【0033】次に、低速値(X)設定部9に、低速値
(X)を、例えば、0.5mm/secを設定し成形を
開始する(ステップS2)。
Next, the low speed value (X) is set to the low speed value (X) setting unit 9, for example, 0.5 mm / sec, and molding is started (step S2).

【0034】次に、ステップS2で設定した低速値
(X)で成形した成形品が、残留ヒズミ、耐久性&耐熱
性などの特性低下、ソリの発生、あるいは未充填やヒケ
のない良品であるかどうかを判断する(ステップS
3)。ここで成形品が良品であると判断されると、スク
リュ6の前進速度が低速値(X)に到達することで保圧
圧力を解放して保圧工程を完了させる成形をn回繰り返
す。
Next, the molded product molded at the low speed value (X) set in step S2 is a non-defective product having no residual flaw, deterioration of characteristics such as durability & heat resistance, warpage, or no filling or sinking. It is determined whether or not (step S
3). If it is determined that the molded product is a non-defective product, the forward pressure of the screw 6 reaches the low speed value (X), thereby releasing the holding pressure and completing the pressure holding process n times.

【0035】次に、n回繰り返し成形を行った際、保圧
時間にバラツキを生じたかどうかを判定し(ステップS
4)、保圧時間のバラツキがなければ、良品SW10を
第1のモード、すなわち、スクリュ6の前進速度が低速
値(X)に到達することで保圧圧力を解放して保圧工程
を完了する方法で連続成形を行う(ステップS5)。
Next, it is judged whether or not the holding time varies when the molding is repeated n times (step S
4) If there is no variation in the holding pressure, the non-defective product SW10 is released in the first mode, that is, when the forward speed of the screw 6 reaches the low speed value (X), the holding pressure is released and the holding process is completed. The continuous molding is performed by the method (step S5).

【0036】一方、保圧時間にバラツキを生じる場合、
良品SW10を第2のモードに切り換え、低速値(X)
に到達するまでの時間を測定し(ステップS6)、この
測定した時間を保圧時間としてプロセスコントローラ1
に自動入力する(ステップS7)。すなわち、予め設定
しておいた保圧時間が満了した時点で保圧工程を完了さ
せる従来の保圧方法と同様に、保圧時間が完了するまで
の時間を設定する。ただし、設定する保圧時間が成形技
術者の経験値に基づいていた従来の保圧方法に対し、本
実施形態で、設定される保圧時間は、スクリュ6が低速
値(X)に到達するまでの時間を測定した測定時間に基
づくため、従来の保圧方法で生じていた、保圧圧力が解
放される時間とスクリュ6が低速値(X)に到達するま
での時間との差分であるムダ時間を削減することができ
る。
On the other hand, when the holding time varies,
Switch the non-defective product SW10 to the second mode and set the low speed value (X).
Is measured (step S6), and the measured time is used as the pressure holding time.
Is automatically input to (step S7). That is, as in the conventional pressure-holding method in which the pressure-holding process is completed when the preset pressure-holding time has expired, the time until the pressure-holding time is completed is set. However, in the present embodiment, the screw 6 reaches the low speed value (X) as compared with the conventional pressure-holding method in which the pressure-holding time to be set is based on the experience value of the molding engineer. It is the difference between the time when the holding pressure is released and the time until the screw 6 reaches the low speed value (X), which is generated by the conventional holding method, because the time is measured based on the measurement time. Waste time can be reduced.

【0037】なお、この保圧時間としてプロセスコント
ローラ1に自動入力する測定値は、n回繰り返し成形を
行った際に予め測定しておいたn個の測定時間のなかか
ら選択するものであってもよい。
The measured value to be automatically input to the process controller 1 as the pressure holding time is selected from the n measured times preliminarily measured when the molding is repeated n times. Good.

【0038】ステップS3において、成形品が良品でな
いと判断された場合には、低速値(X)を変更し、再び
ステップS2に戻る(ステップS8)。
When it is determined in step S3 that the molded product is not a non-defective product, the low speed value (X) is changed and the process returns to step S2 (step S8).

【0039】なお、低速値(X)を変更したにも関わら
ず、良品が得られない場合には、ステップS8で低速値
(X)を変更するのではなく、保圧完了切換SW8を従
来の保圧時間切換に設定する(ステップS9)。そし
て、成形技術者が成形品の品質を加味した経験値による
保圧時間を設定し(ステップS10)、連続成形を行
う。この保圧時間切換のモードは、厚肉成形品など、ス
クリュ6の前進が止まってから、ある一定時間の保圧を
必要とする場合に好適である。
If a low-quality product cannot be obtained despite changing the low speed value (X), the low pressure value (X) is not changed in step S8, and the holding pressure completion switching SW8 is set to the conventional value. The holding pressure switching is set (step S9). Then, the molding engineer sets the pressure holding time based on an empirical value in consideration of the quality of the molded product (step S10), and performs continuous molding. This pressure-holding time switching mode is suitable for holding pressure for a certain period of time after the screw 6 stops advancing, such as a thick-walled molded product.

【0040】図3に、スクリュ6の前進速度が低速値
(X)に到達することで保圧工程を完了させる、あるい
は、低速値(X)に到達するまでの時間を測定し、この
測定した時間を保圧時間として設定し、この設定した保
圧時間が満了した時点で保圧工程を完了させる、本実施
形態の保圧制御方法における、射出ストローク・時間
と、射出圧力・速度の関係を表すグラフの一例を示す。
In FIG. 3, the pressure holding process is completed when the forward speed of the screw 6 reaches the low speed value (X), or the time until the low speed value (X) is reached is measured and measured. Time is set as the pressure holding time, and the pressure holding process is completed when the set pressure holding time expires. In the pressure holding control method of the present embodiment, the relationship between the injection stroke / time and the injection pressure / speed is shown. An example of the graph to represent is shown.

【0041】本実施形態の保圧制御方法によれば、スク
リュ6の前進速度が低速値(X)に達した時点で保圧工
程を完了しているため、従来、設定していた保圧完了ま
での時間t1と、スクリュ6の前進速度が低速値(X)
に達するまでの時間t2との差分であるムダ時間t3を削
減することができる。
According to the pressure-holding control method of this embodiment, the pressure-holding process is completed when the forward speed of the screw 6 reaches the low speed value (X). Until time t 1 and the forward speed of the screw 6 is a low speed value (X)
It is possible to reduce the waste time t 3 which is the difference from the time t 2 until the time reaches.

【0042】なお、本実施形態では、電動式の射出成形
機を一例として説明したが、これに限定されるものでは
なく、油圧式の射出成形機においても、上述した保圧制
御方法は適用可能である。
In this embodiment, the electric injection molding machine has been described as an example, but the present invention is not limited to this, and the above-mentioned holding pressure control method can be applied to a hydraulic injection molding machine. Is.

【0043】[0043]

【発明の効果】以上説明したように本発明によれば、ス
クリュ(6)の前進速度が所定の低速値(X)に到達し
た時点で保圧圧力を解放する、つまり、スクリュ(6)
の前進速度がある速度に達した時点で保圧工程を終了さ
せるため、必要以上の保圧時間、すなわち、ムダ時間を
削減することができるとともに、成形品の品質上のバラ
ツキ低減と生産性の向上を図ることができる。
As described above, according to the present invention, the holding pressure is released when the forward speed of the screw (6) reaches a predetermined low speed value (X), that is, the screw (6).
Since the pressure-holding process is terminated when the advancing speed reaches a certain speed, it is possible to reduce the pressure-holding time that is longer than necessary, that is, the waste time, and reduce the variation in the quality of the molded product and improve the productivity. It is possible to improve.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施形態である射出成形機の射出装
置の概略構成図である。
FIG. 1 is a schematic configuration diagram of an injection device of an injection molding machine that is an embodiment of the present invention.

【図2】本発明の保圧制御方法におけるフローチャート
の一例である。
FIG. 2 is an example of a flowchart in the pressure holding control method of the present invention.

【図3】本発明の保圧制御方法における、射出ストロー
ク・時間と、射出圧力・速度の関係を表すグラフの一例
である。
FIG. 3 is an example of a graph showing the relationship between injection stroke / time and injection pressure / speed in the pressure holding control method of the present invention.

【図4】従来の保圧制御方法における、射出ストローク
・時間と、射出圧力・速度の関係を表すグラフの一例で
ある。
FIG. 4 is an example of a graph showing the relationship between the injection stroke / time and the injection pressure / speed in the conventional pressure holding control method.

【符号の説明】[Explanation of symbols]

1 プロセスコントローラ 2 サーボアンプ 3 タイミングベルト 4 射出サーボモータ 5 シリンダ 6 スクリュ 7 逆流防止リング 8 保圧完了切換SW 9 低速値(X)設定部 10 良品SW 11 エンコーダ 12 速度比較部 13 時間測定演算部 14 制御部 15 ホッパ 16 ボールネジ 1 Process controller 2 Servo amplifier 3 Timing belt 4 injection servo motor 5 cylinders 6 screws 7 Backflow prevention ring 8 Pressure holding completion switching switch 9 Low speed value (X) setting section 10 Good product SW 11 encoder 12 Speed comparison section 13-hour measurement calculator 14 Control unit 15 hoppers 16 ball screws

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 4F206 AP072 AP10 AR022 AR025 JA07 JD03 JL02 JM05 JM14 JN21 JP12 JP13 JP17    ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F206 AP072 AP10 AR022 AR025                       JA07 JD03 JL02 JM05 JM14                       JN21 JP12 JP13 JP17

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 スクリュの前方に溜まったシリンダ内の
溶融樹脂を、前記スクリュを前進させることで金型内に
射出した後に、前記金型内に射出された樹脂に対して保
圧圧力を印加する保圧工程を含む、射出成形機の保圧制
御方法において、 前記保圧工程にて、スクリュ(6)の前進速度が所定の
低速値(X)に到達した時点で前記保圧圧力を解放する
工程を含むことを特徴とする射出成形機の保圧制御方
法。
1. A molten resin in a cylinder accumulated in front of a screw is injected into a mold by advancing the screw, and then a holding pressure is applied to the resin injected into the mold. In the pressure-holding control method for an injection molding machine, including the pressure-holding step, the pressure-holding pressure is released when the forward speed of the screw (6) reaches a predetermined low speed value (X) in the pressure-holding step. A method for controlling pressure holding of an injection molding machine, comprising:
【請求項2】 前記保圧工程が開始された時点から、前
記スクリュ(6)の前進速度が前記低速値(X)に到達
するまでの時間を測定する測定工程と、 前記測定工程後の前記保圧工程にて、前記測定工程で測
定した時間が満了した時点で前記保圧圧力を解放する工
程とを含む、請求項1に記載の射出成形機の保圧制御方
法。
2. A measuring step of measuring a time from when the pressure-holding step is started until the forward speed of the screw (6) reaches the low speed value (X), and the measuring step after the measuring step. The holding pressure control method for an injection molding machine according to claim 1, further comprising the step of releasing the holding pressure when the time measured in the measuring step has expired in the pressure holding step.
【請求項3】 前記保圧圧力を印加する時間を予め任意
に設定する保圧時間設定工程と、 前記保圧工程にて、前記保圧時間設定工程で設定した時
間が満了した時点で前記保圧圧力を解放する工程とを含
む、請求項1または2に記載の射出成形機の保圧制御方
法。
3. A holding pressure setting step of arbitrarily setting a time for applying the holding pressure in advance, and the holding step at the holding step when the time set in the holding time setting step has expired. The pressure holding control method for an injection molding machine according to claim 1, further comprising the step of releasing the pressure.
JP2001321979A 2001-10-19 2001-10-19 Pressure holding control method for injection molding machine Expired - Lifetime JP3875060B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001321979A JP3875060B2 (en) 2001-10-19 2001-10-19 Pressure holding control method for injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001321979A JP3875060B2 (en) 2001-10-19 2001-10-19 Pressure holding control method for injection molding machine

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Publication Number Publication Date
JP2003127196A true JP2003127196A (en) 2003-05-08
JP3875060B2 JP3875060B2 (en) 2007-01-31

Family

ID=19139101

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015024568A (en) * 2013-07-26 2015-02-05 宇部興産機械株式会社 Controlling method for injection filling step of injection molding machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015024568A (en) * 2013-07-26 2015-02-05 宇部興産機械株式会社 Controlling method for injection filling step of injection molding machine

Also Published As

Publication number Publication date
JP3875060B2 (en) 2007-01-31

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