JPH0443493B2 - - Google Patents
Info
- Publication number
- JPH0443493B2 JPH0443493B2 JP25478486A JP25478486A JPH0443493B2 JP H0443493 B2 JPH0443493 B2 JP H0443493B2 JP 25478486 A JP25478486 A JP 25478486A JP 25478486 A JP25478486 A JP 25478486A JP H0443493 B2 JPH0443493 B2 JP H0443493B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- molding
- filling
- preforming
- steady
- 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
Links
- 238000000465 moulding Methods 0.000 claims description 78
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は、射出成形機の成形立上げ制御方法及
び装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a molding start-up control method and apparatus for an injection molding machine.
(ロ) 従来の技術
射出成形機を用いて定常的な成形を行つている
場合には、既に得られている定常成形条件により
成形を続行すれば良好な成形品を得ることができ
る。しかし、成形中断後の成形再開始時、金型交
換後の成形開始時などの成形立上げ時において
は、成形開始時のゲート詰まり、金型温度低下、
ゲートバランス不良などによる異常な高圧力によ
つて金型キヤビテイ内への過充てんが発生し、こ
れにより生ずるバリによつて金型の破損を発生す
る場合がある。このため、成形立上げ時には作業
者が過充てんが発生しないような条件を設定して
数のシヨツト又はそれ以上の回数成形し、試行錯
誤により徐々に定常成形条件に戻す作業が必要で
ある。(B) Prior art When steady molding is performed using an injection molding machine, a good molded product can be obtained by continuing molding under the steady molding conditions already obtained. However, when starting up molding, such as when restarting molding after a molding interruption, or when starting molding after replacing the mold, the gate may become clogged at the start of molding, the mold temperature may drop, etc.
Overfilling of the mold cavity may occur due to abnormally high pressure due to poor gate balance, and the resulting burrs may cause damage to the mold. Therefore, when starting up molding, it is necessary for the operator to set conditions to prevent overfilling, perform molding a few shots or more, and gradually return to steady molding conditions through trial and error.
(ハ) 発明が解決しようとする問題点
しかし、上記のような成形立上げ時の調整作業
は、熱練した作業者が経験及び勘に基づいて行う
ものであり、多大な時間及び労力を必要とし、ま
た樹脂材料もむだになつていた。すなわち、過充
てんを生じないようにするための条件変更の方法
として、射出シリンダの充てんストロークの短
縮、射出速度の低下、保圧力の低減、充てん保圧
時間の短縮、上記要素の組合わせなど多くの方法
があり、成形条件の変更を適切に行うことは容易
なものではない。また、変更された成形条件での
成形シヨツト数も作業者の経験によるため、成形
開始から定常成形条件への切換えまでの時間及び
成形品品質のばらつきが大きく安定しない場合が
多い。本発明は、このような問題点を解決するこ
とを目的としている。(c) Problems to be solved by the invention However, the above-mentioned adjustment work at the start-up of molding is performed by trained workers based on experience and intuition, and requires a great deal of time and effort. Moreover, the resin material was also wasted. In other words, there are many ways to change the conditions to prevent overfilling, such as shortening the filling stroke of the injection cylinder, lowering the injection speed, reducing the holding pressure, shortening the filling and holding pressure time, and combining the above factors. There are several methods, and it is not easy to change the molding conditions appropriately. Furthermore, since the number of molding shots under changed molding conditions also depends on the operator's experience, the time from the start of molding to switching to steady molding conditions and the quality of molded products often vary widely and are not stable. The present invention aims to solve these problems.
(ニ) 問題点を解決するための手段
本発明は、充てん圧力を検出し、これが所定値
に達した場合にはあらかじめ設定された予備成形
容充てん圧力のシヨツト数連続して成形を行い、
次いで定常成形条件に復帰することにより、上記
問題点を解決する。(d) Means for solving the problem The present invention detects the filling pressure, and when it reaches a predetermined value, continuously performs molding for a preset number of shots at a preset filling pressure.
Next, the above problem is solved by returning to steady molding conditions.
すなわち、本発明方法は、成形立上げの際の任
意のシヨツトの充てん圧力を検出し、充てん圧力
が所定値まで達しない場合にはそのまま定常成形
条件の充てん速度及び保圧力で射出充てん及び保
圧工程を行い、充てん圧力が所定値まで達した場
合には予備成形用充てん圧力所定のシヨツト数連
続して射出充てん及び保圧工程を行い、所定のシ
ヨツト数完了後、上記定常成形条件に自動的に切
換えることを要旨としている。 In other words, the method of the present invention detects the filling pressure of any shot at the time of molding start-up, and if the filling pressure does not reach a predetermined value, injection filling and holding pressure are continued at the filling speed and holding pressure of steady molding conditions. When the filling pressure reaches a predetermined value, injection filling and pressure holding processes are performed continuously for a preforming filling pressure for a predetermined number of shots, and after completing the predetermined number of shots, the above steady molding conditions are automatically set. The main idea is to switch to
また、本発明装置は、定常成形の充てん速度を
設定する定常成形用速度設定器と、定常成形の保
圧力を設定する定常成形用圧力説定器と、予備成
形時の充てん圧力を設定する予備成形用圧力設定
器と、予備成形時のシヨツト数を設定する予備成
形用シヨツト数設定器と、予備成形の際の圧力制
限値を設定する圧力制限設定器と、圧力制限値設
定器に設定された圧力制限値と圧力検出器によつ
て検出される実際の充てん圧力とを比較する比較
器と、比較器が実際の充てん圧力が圧力制限値よ
りも小さいと判断したときには定常成形用速度設
定器及び定常成形用圧力設定器の設定値をサーボ
増幅器に入力し、比較器が実際の充てん圧力が圧
力制限値に達したと判断したときには予備成形用
圧力設定器及び予備成形用ジヨツト数設定器の設
定値をサーボする増幅器に入力するコントローラ
と、を有している。 The device of the present invention also includes a speed setting device for steady molding that sets the filling speed for steady molding, a pressure regulator for steady molding that sets the holding pressure for steady molding, and a preliminary molding device that sets the filling pressure during preforming. The molding pressure setting device, the preforming shot number setting device that sets the number of shots during preforming, the pressure limit setting device that sets the pressure limit value during preforming, and the pressure limit value setting device. A comparator that compares the actual filling pressure detected by the pressure detector with the pressure limit value set by the pressure detector, and a speed setting device for steady-state molding when the comparator determines that the actual filling pressure is less than the pressure limit value. and the set values of the steady-state molding pressure setter are input to the servo amplifier, and when the comparator determines that the actual filling pressure has reached the pressure limit value, the preforming pressure setter and preforming joint number setter are input. and a controller for inputting set values to the servo amplifier.
(ホ) 作用
成形立上げ時に金型のゲート詰まり、金型温度
低下、ゲートバランス不良などにより過大な異常
圧力が発生した場合、低い予備成形用充てん圧力
により予備成形用シヨツト数だけ金型キヤビテイ
への充てんが行われる。予備成形用シヨツト数が
終了後、定常成形条件に切換られて開始される。
これにより成形立上げに必要な時間が一定とな
り、予備成形用シヨツト数完了後円滑に定常成形
へ移行することができ、成形品の品質も短時間に
安定する。(e) Effect If excessive abnormal pressure occurs during molding start-up due to mold gate clogging, mold temperature drop, poor gate balance, etc., the low preforming filling pressure will fill the mold cavity by the number of preforming shots. will be filled. After the number of shots for preforming is completed, steady molding conditions are switched to and started.
As a result, the time required to start up molding becomes constant, and after the number of shots for preforming is completed, it is possible to smoothly shift to steady molding, and the quality of the molded product is stabilized in a short time.
(ヘ) 実施例
第１図に本発明の実施例を示す。シリンダ１０
内に説けられるスクリユー１２は油圧モータ１４
によつて回転駆動されると共に射出シリンダ１６
内の射出ラム１８と一体に前後進する。射出ラム
１８に作用する射出シリンダ１６内の油圧は圧力
検出器２０によつて検出され、増幅器２２を介し
てサーボ増幅器２４及び後述の比較器２６に与え
られる。また、スクリユー１２の移動速度は速度
検出器２８によつて検出され、これからの信号も
増幅器３０を介してサーボ増幅器２４に与えられ
る。射出シリンダ１６には、油圧源４２から供給
される油圧をサーボ４４によつて調整したものが
供給される。比較器２６には予備成形の際の圧力
制限値を設定する圧力制限値設定器４８からの信
号が入力されており、比較器２６はこれと増幅器
２２からの信号とを比較し、コントローラ４８に
信号を出力する。コントローラ４８は定常成形用
速度設定器５０及び定常成形用圧力設定器５２か
らの定常成形条件、又は予備成形圧力設定器５４
及び予備成形用シヨツト数設定器５６からの予備
成形条件をサーボ増幅器２４に供給する。ただ
し、定常成形用速度設定器５０は多段速度設定可
能であり、定常成形用圧力設定器５２は多段圧力
設定可能である。(f) Example FIG. 1 shows an example of the present invention. cylinder 10
The screw 12 inside is a hydraulic motor 14
The injection cylinder 16 is rotationally driven by
It moves forward and backward together with the injection ram 18 inside. The hydraulic pressure within the injection cylinder 16 acting on the injection ram 18 is detected by a pressure detector 20 and is applied via an amplifier 22 to a servo amplifier 24 and a comparator 26, which will be described later. Further, the moving speed of the screw 12 is detected by a speed detector 28, and a signal from this is also provided to the servo amplifier 24 via an amplifier 30. The injection cylinder 16 is supplied with hydraulic pressure that is supplied from a hydraulic source 42 and adjusted by a servo 44 . A signal from a pressure limit value setter 48 that sets a pressure limit value during preforming is input to the comparator 26, and the comparator 26 compares this with the signal from the amplifier 22 and sends the signal to the controller 48. Output a signal. The controller 48 controls the steady molding conditions from the steady molding speed setter 50 and the steady molding pressure setter 52, or the preforming pressure setter 54.
And the preforming conditions from the preforming shot number setting device 56 are supplied to the servo amplifier 24. However, the steady molding speed setter 50 can set the speed in multiple stages, and the steady molding pressure setter 52 can set the pressure in multiple stages.
次にこの実施例の作用について説明する。射出
開始時、射出再開時などの成形立ち上げ時には、
まず定常成形用速度設定器５０及び定常成形用圧
力設定器５２に設定された定常成形条件により第
１回目の射出充てんが開始される。この際、圧力
検出器２０によつて検出される射出シリンダ１６
の圧力、すなわち充てん圧力が、増幅器２２を介
して比較器２６へ入力され、ここで圧力制限値設
定器４６に設定されている圧力制限値P1と比較
される。実際の充てん圧力が圧力制限値P1より
も小さい場合には、比較器２６はコントローラ４
８における予備成形条件と定常成形条件との切換
が第１に示す状態、すなわち定常成形用速度設定
器５０及び定常成形用圧力設定器５２からの定常
成形条件をサーボ増幅器２４に入力する状態に保
持される。従つて、第１回目の成形から定常成形
条件による成形が行なわれる。なお、定常成形用
速度設定器５０及び定常成形用圧力設定器５２に
設定された定常成形条件はコントローラ４８の指
令によりサーボ増幅器２４に与えられ、サーボ増
幅器２４はこれに基づいてサーボ弁４４に所定の
電流又は電圧を供給し、設定された速度及び圧力
となるように射出シリンダ１６へ供給する油圧を
調節する。実際の充てん速度及び充てん圧力はそ
れぞれ速度検出器２８及び圧力検出器２０によつ
て検出され、サーボ増幅器２４にフイードバツク
され、設定値と実際値との偏差がなくなるように
フイードバツク制御が行われる。 Next, the operation of this embodiment will be explained. At the start of molding, such as when starting injection or restarting injection,
First, the first injection filling is started under the steady molding conditions set in the steady molding speed setter 50 and the steady molding pressure setter 52. At this time, the injection cylinder 16 detected by the pressure detector 20
The pressure, that is, the filling pressure, is inputted via the amplifier 22 to the comparator 26, where it is compared with the pressure limit value P 1 set in the pressure limit value setting device 46. If the actual filling pressure is less than the pressure limit value P 1 , the comparator 26
The switching between the preforming conditions and the steady molding conditions in step 8 is maintained in the first state, that is, the state in which the steady molding conditions from the steady molding speed setter 50 and the steady molding pressure setter 52 are input to the servo amplifier 24. be done. Therefore, from the first molding, molding is performed under steady molding conditions. Note that the steady-state molding conditions set in the steady-state molding speed setter 50 and the steady-state molding pressure setter 52 are given to the servo amplifier 24 by commands from the controller 48, and the servo amplifier 24 sets the predetermined conditions to the servo valve 44 based on the commands from the controller 48. The current or voltage is supplied to the injection cylinder 16, and the hydraulic pressure supplied to the injection cylinder 16 is adjusted so that the set speed and pressure are achieved. The actual filling speed and filling pressure are detected by the speed detector 28 and the pressure detector 20, respectively, and are fed back to the servo amplifier 24, and feedback control is performed so that there is no deviation between the set value and the actual value.
一方、第１回目又は第２回目以降の射出充てん
時に、実際の充てん圧力制限値設定器４６に設定
された圧力制限値P1に達した場合には、比較器
２６らの指令によりコントローラ４８は、定常成
形条件から予備成形条件へ切換え、予備成形用圧
力設定器５４及び予備成形用シヨツト数設定器５
６からの設定値がサーボ増幅器２４へ入力され
る。これにより予備成形用圧力設定器５４に設定
された予備成形用の充てん圧力P2により射出充
てんが行われ、の射出充てんは予備成形用シヨツ
ト数設定器５６に設定されたシヨツト数ｎだけ実
行される。ｎ回の射出充てんが終了すると、コン
ローラ４８が切換わり、定常成形用速度設定器５
０及び定常成形用圧力設定器５２に設定された定
常成形条件により成形が行われる。上記のような
予備成形の間、金型温度が次第に上昇し樹脂の流
動性が向上していくので、徐々に充てんを負荷圧
力が低下して充てんしやすくなり、充てん圧力は
第２図に示すように変化し、定常成形時の充てん
を圧力特性に近づいていく。また、充てんストロ
ークも第３図に示すように定常成形時の充てんス
トロークに近づいていき、予備成形用シヨツト数
ｎ終了後は円滑に定常成形条件に移行していく。
このように予備成形が行われるので、過大な異常
充てん圧力が発生することがなく、金型の破損を
防止することができる。 On the other hand, when the pressure limit value P 1 set in the actual filling pressure limit value setting device 46 is reached during the first or second injection filling, the controller 48 is , switch from steady molding conditions to preforming conditions, preforming pressure setting device 54 and preforming shot number setting device 5
The set value from 6 is input to the servo amplifier 24. As a result, injection filling is performed using the filling pressure P 2 for preforming set in the preforming pressure setting device 54, and injection filling is performed for the number n of shots set in the preforming shot number setting device 56. Ru. When injection filling is completed n times, the controller 48 is switched and the speed setting device 5 for steady molding is switched.
Molding is performed under the steady molding conditions set at 0 and the steady molding pressure setting device 52. During preforming as described above, the mold temperature gradually rises and the fluidity of the resin improves, so the loading pressure gradually decreases and it becomes easier to fill.The filling pressure is shown in Figure 2. The filling changes as follows, and the filling becomes closer to the pressure characteristics during steady molding. Further, as shown in FIG. 3, the filling stroke approaches the filling stroke during steady molding, and after the number n of shots for preforming is completed, the condition smoothly shifts to steady molding conditions.
Since preforming is performed in this manner, excessive abnormal filling pressure does not occur, and damage to the mold can be prevented.
なお、この実施例では充てん圧力の検出は射出
シリンダ１６の油圧を検出することにより行つた
が、金型内の樹脂圧力又はシリンダ１０のノズル
先端樹脂圧力を検出するようにしても差し支えな
い。 In this embodiment, the filling pressure was detected by detecting the oil pressure of the injection cylinder 16, but the resin pressure within the mold or the resin pressure at the nozzle tip of the cylinder 10 may also be detected.
(ト) 発明の効果
以上説明してきたように、本発明によると、成
形立上げ時に充てん圧力が高くなる場合には、低
い充てん圧力で予備成形を所定シヨツト数だけ行
うようにしたので、金型キヤビテイへの過充てん
を発生せず、従つて過充てんによる種々のトラブ
ルを回避することができる。熟練した作業者によ
る面倒な調整作業を必要とせず、自動的に定常成
形条件へ切換えることができる。これにより成形
立上げ時間が一定となり、材料の損失も減少し、
金型の破損も防止することができる。(G) Effects of the Invention As explained above, according to the present invention, when the filling pressure increases at the start-up of molding, preforming is performed for a predetermined number of shots at a low filling pressure. Overfilling of the cavity does not occur, and various troubles caused by overfilling can therefore be avoided. It is possible to automatically switch to steady molding conditions without the need for troublesome adjustment work by skilled workers. This keeps the molding start-up time constant and reduces material loss.
Damage to the mold can also be prevented.
第１図は本発明の実施例を示す図、第２図は充
てん圧力の変化を示す図、第３図は充てんストロ
ークの変化を示す図である。
１０……シリンダ、１２……スクリユー、１６
……射出シリンダ、１８……射出ラム、２０……
圧力検出器、２４……サーボ弁増幅器、２６……
比較器、２８……速度検出器、４４……サーボ
弁、４６……圧力制限値設定器、４８……コント
ローラ、５０……定常成形用速度設定器、５２…
…定常成形用圧力設定器、５６……予備成形用シ
ヨツト数設定器。
FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing changes in filling pressure, and FIG. 3 is a diagram showing changes in filling stroke. 10...Cylinder, 12...Screw, 16
...Injection cylinder, 18...Injection ram, 20...
Pressure detector, 24... Servo valve amplifier, 26...
Comparator, 28... Speed detector, 44... Servo valve, 46... Pressure limit value setter, 48... Controller, 50... Steady molding speed setter, 52...
...Pressure setting device for steady forming, 56...Shot number setting device for preforming.
Claims (1)
力を検出し、充てん圧力が所定値まで達しない場
合にはそのまま定常成形条件の充てん速度及び保
圧力で射出充てん及び保圧工程を行い、充てん圧
力が所定値まで達した場合には予備成形用充てん
圧力で所定のシヨツト数連続して射出充てん及び
保圧工程を行い、所定のシヨツト数完了後、上記
定常成形条件に自動的に切換えることを特徴とす
る射出成形機の成形立上げ制御方法。 ２ 射出シリンダへの供給油圧を制御するサーボ
弁と、充てん圧力を検出する圧力検出器と、充て
ん速度を検出する速度検出器と、圧力検出器及び
速度検出器からの信号によりサーボ弁の作動をフ
イードバツク制御するサーボ増幅器と、を有する
射出成形機の成形立上げ制御装置において、 定常成形の充てん速度を設定する定常成形用速
度設定器と、定常成形の保圧力を設定する定常成
形用圧力設定器と、予備成形時の充てん圧力を設
定する予備成形用圧力設定器と、予備成形時のシ
ヨツト数を設定とする予備成形用シヨツト数設定
器と、予備成形の際の圧力制限値を設定とする圧
力制限値設定器と、圧力制限値設定器に設定され
た圧力制限値と圧力検出器によつて検出される実
際の充てん圧力とを比較する比較器と、比較器が
実際の充てん圧力が圧力制限値よりも小さいと判
断したときには定常成形用速度設定器及び定常成
形用圧力設定器の設定値をサーボ増幅器に入力
し、比較器が実際の充てん圧力が圧力制限値に達
したと判断したときには予備成形用圧力設定器及
び予備成形用シヨツト数設定器の設定値をサーボ
増幅器に入力するコントローラと、を有すること
を特徴とする射出成形機の成形立上げ制御装置。[Scope of Claims] 1. Detects the filling pressure of any shot during molding start-up, and if the filling pressure does not reach a predetermined value, injection filling and holding pressure are carried out at the filling speed and holding pressure of steady molding conditions. When the filling pressure reaches a predetermined value, injection filling and pressure holding processes are performed for a predetermined number of shots in succession at the filling pressure for preforming, and after the predetermined number of shots are completed, the above steady-state molding conditions are automatically applied. A molding start-up control method for an injection molding machine characterized by switching automatically. 2 A servo valve that controls the hydraulic pressure supplied to the injection cylinder, a pressure detector that detects the filling pressure, a speed detector that detects the filling speed, and a signal from the pressure detector and the speed detector that operates the servo valve. A molding start-up control device for an injection molding machine having a servo amplifier for feedback control, a steady molding speed setter for setting the filling speed for steady molding, and a steady molding pressure setter for setting the holding pressure for steady molding. , a preforming pressure setting device for setting the filling pressure during preforming, a preforming shot number setting device for setting the number of shots during preforming, and a pressure limit value for preforming. a pressure limit value setter, a comparator that compares the pressure limit value set in the pressure limit value setter and the actual filling pressure detected by the pressure detector; When the comparator determines that the actual filling pressure has reached the pressure limit value, the set values of the steady molding speed setter and the steady molding pressure setter are input to the servo amplifier. 1. A molding start-up control device for an injection molding machine, comprising: a controller for inputting setting values of a preforming pressure setting device and a preforming shot number setting device to a servo amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25478486A JPS63109035A (en) | 1986-10-28 | 1986-10-28 | Method and apparatus for controlling first molding transition in injection molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25478486A JPS63109035A (en) | 1986-10-28 | 1986-10-28 | Method and apparatus for controlling first molding transition in injection molder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63109035A JPS63109035A (en) | 1988-05-13 |
| JPH0443493B2 true JPH0443493B2 (en) | 1992-07-16 |
Family
ID=17269832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25478486A Granted JPS63109035A (en) | 1986-10-28 | 1986-10-28 | Method and apparatus for controlling first molding transition in injection molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63109035A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4889574B2 (en) * | 2007-06-08 | 2012-03-07 | パナソニック株式会社 | Control method of injection molding machine |
| JP5410663B2 (en) * | 2007-08-27 | 2014-02-05 | 東洋機械金属株式会社 | Injection molding machine |
| JP7317476B2 (en) * | 2018-09-19 | 2023-07-31 | 住友重機械工業株式会社 | Injection molding machine |
-
1986
- 1986-10-28 JP JP25478486A patent/JPS63109035A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63109035A (en) | 1988-05-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |