JPS634926A - Control of injection molder - Google Patents

Control of injection molder

Info

Publication number
JPS634926A
JPS634926A JP14829786A JP14829786A JPS634926A JP S634926 A JPS634926 A JP S634926A JP 14829786 A JP14829786 A JP 14829786A JP 14829786 A JP14829786 A JP 14829786A JP S634926 A JPS634926 A JP S634926A
Authority
JP
Japan
Prior art keywords
pressure
screw
stage
setter
holding
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
JP14829786A
Other languages
Japanese (ja)
Other versions
JPH0441894B2 (en
Inventor
Kenji Kasugai
春日井 賢治
Akira Yokota
明 横田
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 JP14829786A priority Critical patent/JPS634926A/en
Publication of JPS634926A publication Critical patent/JPS634926A/en
Publication of JPH0441894B2 publication Critical patent/JPH0441894B2/ja
Granted legal-status Critical Current

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  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To make an amount of retreatment of a screw, which is generated upon switching a keeping pressure, constant at all times and permit a stable molding of an injection molder, by a method wherein switching from a first stage pressure to a second stage pressure in a pressure keeping process is sffected based on a position of the screw. CONSTITUTION:When a screw 12 has arrived at a position set by an injection speed switching position setter 36(1), a pressure keeping process is started. In this case, the pressure becomes a first stage pressure P1, set by a keeping pressure setter 40(1). The first stage pressure P1 is set lower than a filling pressure PO, therefore, the screw 12 is retreated by being pushed by a resin pressure. When the amount of the retreatment has coincided with the set value of a screw retreating amount setter 34, the pressure becomes a second stage pressure P2, set by another keeping pressure setter 40(2). A condition under the second stage pressure P2 is continued for a period of time which is set by a pressure keeping time setter 42(2), thereafter, the pressure becomes a third stage pressure P3, set by another keeping pressure setter 40(3).

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明は、射出成形機の制御方法に関するものである。[Detailed description of the invention] (b) Industrial application fields The present invention relates to a method for controlling an injection molding machine.

(ロ)従来の技術 射出成形においては充てん工程に引き続いて保圧工程が
行われる。その際、保圧工程の第1段圧力を充てん圧力
よりも大幅に小さい値に設定する場合がある。これは、
例えば円盤状の成形品などのように投影面積が大きいた
め型締力に余裕がなくばつが発生しやすい場合や、金型
構造が複雑で小径のピンなどを有するために破損しやす
い場合などに、保圧工程の第1段圧力を低く設定し、ば
つの発生や過充てんなどを防止するためである。
(b) Conventional technology In injection molding, a pressure holding process is performed following the filling process. At that time, the first stage pressure of the pressure holding step may be set to a value significantly smaller than the filling pressure. this is,
For example, when the projected area is large, such as a disc-shaped molded product, there is not enough room for clamping force, which tends to cause fraying, or when the mold structure is complex and has small-diameter pins, etc., which can easily cause damage. This is to set the first stage pressure of the pressure holding process low to prevent occurrence of bubbles, overfilling, etc.

保圧工程の第1段圧力は充てん工程から保圧工程への切
換後所定時間保持され、次いで第2段圧力以下多段にわ
たって保圧工程の制御が行われる。
The first stage pressure of the pressure holding process is maintained for a predetermined time after switching from the filling process to the pressure holding process, and then the pressure holding process is controlled in multiple stages below the second stage pressure.

第2段以下の各段の圧力もそれぞれあらかじめ設定した
時間だけ保持される。
The pressure in each stage below the second stage is also maintained for a preset time.

(ハ)発明が解決しようとする問題点 しかし、上記のような従来の制御では、第1段圧力はあ
らかじめ設定した時間保持されるようになっているため
、第1段圧力から第2段圧力へ切換ねる際のスクリュー
の位置が変動するという問題点かある。すなわち、保圧
工程の第1段圧力は充てん圧力よりも大幅に低い値に設
定されているため、充てん済みの金型内の樹脂圧力に押
されてスクリューか後退するが、設定時間内におけるこ
のスクリューの後退量は、樹脂材料の混練むら、金型温
度の変化に基づく充てん状態の変動などにより、各ショ
ットことに変化する。このため、成形品重量のばらつき
が増大するなど成形条件か不安定となる。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, in the conventional control as described above, the first stage pressure is held for a preset period of time, so the pressure is changed from the first stage pressure to the second stage pressure. There is a problem that the position of the screw changes when switching. In other words, the first stage pressure in the pressure holding process is set to a value significantly lower than the filling pressure, so the screw is pushed back by the resin pressure in the filled mold, but this occurs within the set time. The amount of retraction of the screw changes with each shot due to uneven kneading of the resin material, fluctuations in the filling state due to changes in mold temperature, etc. As a result, molding conditions become unstable, such as increased variation in weight of molded products. 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、保圧T桿の第1段圧力から第2段圧力への切
換えを、スクリューの位置を基準として行うことにより
−に記問題点を解決する。すなわち、本発明による射出
成形機の制御方法においては、スクリューがあらかじめ
設定された所定量■に後退するまで保圧工程の第1段圧
力を保持し、スクリューが所定位置まで後退した後は、
保圧工程の第2段圧力以Jの圧力を各段ごとに設定され
た時間保持して保圧工程を行う。
(d) Means for solving the problem The present invention solves the problem described in - by switching the pressure holding T rod from the first stage pressure to the second stage pressure with reference to the screw position. do. That is, in the injection molding machine control method according to the present invention, the first stage pressure of the holding pressure step is maintained until the screw retreats to a preset predetermined amount (■), and after the screw retreats to the predetermined position,
The pressure holding step is performed by maintaining a pressure equal to or higher than the second stage pressure for a set time for each stage.

(ホ)作用 充てん工程が終了すると所定の保圧切換信号により保圧
工程が開始され、まず第1段月−力が負荷される状態と
なる。この第1段圧力は充てん圧力よりも低く設定しで
あるため、樹脂圧力によってスクリューが後退する。ス
クリューがあらかじめ設定された位置まで後退すると、
第2段圧力を負荷する状態に切換られる。第2段圧力を
負荷する状態はあらかじめ設定された時間保持される。
(E) Operation When the filling process is completed, the pressure holding process is started by a predetermined pressure holding switching signal, and the first stage force is first applied. Since this first stage pressure is set lower than the filling pressure, the screw is retracted by the resin pressure. When the screw retracts to the preset position,
The state is switched to the state where the second stage pressure is applied. The state in which the second stage pressure is applied is maintained for a preset time.

保圧工程の第3段以下の各段についてもそれぞれ所定の
設定時間保持される。これにより保圧切換え時に発生す
るスクリューの後退量か常に一定となり、安定した成形
を行うことができる。
Each of the third and subsequent stages of the pressure holding process is also held for a predetermined set time. As a result, the amount of screw retraction that occurs when changing the holding pressure is always constant, and stable molding can be performed.

(へ)実施例 第1図に本発明方法を実施する装置を示す。(f) Example FIG. 1 shows an apparatus for carrying out the method of the invention.

シリフタ10内にスクリュー12が回転可能かつ軸方向
に移動可能に設けられている。スクリュー12は射出シ
リンダ14のピストン16とピストンロッド18によっ
て連結されており、これによりスクリュー12の軸方向
位置の制御が行われる。なお、スクリュー12を回転駆
動する機構については図示を省略しである。ピストンロ
ッド18と軸方向に一体に移動するように、ブラケット
20が設けられており、これにスクリュー(i’7置装
出器22が設けられている。これによりスクリュー12
の位置を検出可能である。スクリュー位置検出器22に
よって検出されたスクリュー12の位置を示す信号は、
制御装置24に人力される。射出シリンダ14の作動圧
は、オイルポンプ26の吐出圧を電磁圧力制御弁28及
び電磁流量制御弁30によって制御したものである。電
磁圧力制御弁28及び電磁流量制御弁30の作動は、制
御装置24からの信号に基づいて制御される。制御装置
24には条件設定装置32からの設定信号も人力されて
いる。条件設定装置32には、スクリュー後退量設定器
34、射出速度切換位置設定器群36 (++〜36(
。)、速度設定器群38 (11〜38 (yl−11
、保圧圧力設定器群40 N1〜40 (m) 、保圧
時間設定器群42(2)〜42 、、、及び充てん圧力
設定器44を有している。スクリュー後退量設定器34
は、保圧切換え時点からのスクリュー12の後退量を設
定する設定器である。射出速度切換位置設定器群36 
(11〜36 fnl は、充て)V工程時における射
出速度を切換えるべき位置を設定する設定器である。速
度設定器群38 N1〜38.。−〇は、射出速度切換
位置設定器群36 (11〜36.。、によって分割設
定された各ストロークの射出速度を設定する設定器であ
る。保圧圧力設定器群40 N1〜40 (ml は、
保圧工程における各段の保圧圧力を設定する設定器であ
る。保圧時間設定器群42 (21〜421.は、保圧
圧力設定器群40 T21〜401.によって設定され
た各圧力の保圧時間を設定する設定器である。充てん圧
力設定器44は、充てん工程における最大圧力を設定す
る設定器である。
A screw 12 is provided within the syrifter 10 so as to be rotatable and movable in the axial direction. The screw 12 is connected to a piston 16 of an injection cylinder 14 by a piston rod 18, thereby controlling the axial position of the screw 12. Note that illustration of a mechanism for rotationally driving the screw 12 is omitted. A bracket 20 is provided so as to move together with the piston rod 18 in the axial direction, and a screw (i'7 device extractor 22) is provided on this.
The position of can be detected. The signal indicating the position of the screw 12 detected by the screw position detector 22 is
It is manually operated by the control device 24. The operating pressure of the injection cylinder 14 is the discharge pressure of the oil pump 26 controlled by an electromagnetic pressure control valve 28 and an electromagnetic flow control valve 30. The operation of the electromagnetic pressure control valve 28 and the electromagnetic flow control valve 30 is controlled based on signals from the control device 24. The control device 24 also receives setting signals from the condition setting device 32 manually. The condition setting device 32 includes a screw retraction amount setting device 34 and an injection speed switching position setting device group 36 (++~36(
. ), speed setter group 38 (11 to 38 (yl-11
, a holding pressure setting device group 40 N1 to 40 (m), a holding pressure setting device group 42 (2) to 42 (m), , and a filling pressure setting device 44. Screw retraction amount setting device 34
is a setting device for setting the amount of retraction of the screw 12 from the time of switching the holding pressure. Injection speed switching position setter group 36
(11 to 36 fnl are reserved) This is a setting device that sets the position at which the injection speed should be switched during the V process. Speed setter group 38 N1-38. . -〇 is a setting device that sets the injection speed of each stroke divided and set by the injection speed switching position setting device group 36 (11 to 36..).The holding pressure setting device group 40 N1 to 40 (ml is ,
This is a setting device that sets the holding pressure at each stage in the holding pressure process. Holding pressure setting device group 42 (21 to 421. are setting devices for setting the holding time of each pressure set by the holding pressure setting device group 40 T21 to 401. The filling pressure setting device 44 is This is a setting device that sets the maximum pressure in the filling process.

次にこの実施例の作用について説明する。充てん工程開
始前においては、スクリュー12の回転により樹脂材料
が所定量だけ混練・可塑化され、スクリュー12は先端
部側にたまる溶融樹脂の圧力により後退しく第1図中で
右方向に移動し)、射出速度切換位置設定器36(。)
によって設定された位置まできて停止する。すなわち、
射出速度切換位置設定器36(。、は溶融樹脂の計量値
の設定器でもあることになる。スクリュー12が射出速
度切換位置設定器36 (n)に設定された位置まで後
退すると、充てん工程が開始される。すなわち、制御装
置24からの信号により電磁圧力制御弁28及び電磁流
量制御弁30が作動し、作動油が射出シリンダ14に送
られ、スクリュー12が前進する。その際のスクリュー
12の速度は射出速度切換位置設定器群36.。、〜3
6 (11によって区切られた各ストロークごとにそれ
ぞれ速度設定器群38.。−1,〜3 B (n によ
って設定された速度により前進する。こうすることによ
って、スクリュー12が射出速度切換位置設定器36 
(1)によって設定された位置まで達すると(このとき
の充てん圧力は充てん圧力設定器によって設定されたP
oとなっている)、制御装置24から信号が出力され保
圧工程が開始される。すなわち、制御装置24は保圧圧
力設定器40(1)によって設定された第1段圧力P1
となるように電磁圧力制御弁28及び電磁流量制御弁3
0の作動を制御する。この第1段圧力P1は前述の充て
ん圧力P。
Next, the operation of this embodiment will be explained. Before the filling process starts, the resin material is kneaded and plasticized by a predetermined amount by the rotation of the screw 12, and the screw 12 moves backward and to the right in Fig. 1 due to the pressure of the molten resin accumulated on the tip side. , injection speed switching position setter 36 (.)
It will come to the position set by and stop. That is,
The injection speed switch position setter 36 (.) is also a setter for the measured value of the molten resin. When the screw 12 retreats to the position set in the injection speed switch position setter 36 (n), the filling process starts. That is, the electromagnetic pressure control valve 28 and the electromagnetic flow control valve 30 are operated by a signal from the control device 24, hydraulic oil is sent to the injection cylinder 14, and the screw 12 moves forward. The speed is determined by the injection speed switching position setter group 36..,~3
For each stroke divided by 6 (11), the speed setter group 38..-1, ~3 B (n) moves forward at the speed set by n. 36
When the position set by (1) is reached (the filling pressure at this time is P set by the filling pressure setting device)
o), a signal is output from the control device 24 and the pressure holding process is started. That is, the control device 24 controls the first stage pressure P1 set by the holding pressure setting device 40(1).
The electromagnetic pressure control valve 28 and the electromagnetic flow control valve 3
Controls the operation of 0. This first stage pressure P1 is the above-mentioned filling pressure P.

よりも大幅に小さく設定されているため、スクリュー1
2は金型側の樹脂圧力に押されて後退する。スクリュー
12の後退量がスクリュー後退量設定器34の設定値と
一致したとき、制御装置24は保圧圧力を保圧圧力設定
器40 T21 によって設定された第2段圧力P2と
なるように電磁圧力制御弁28及び電磁流量制御弁30
の作動を制御する。この第2段圧力P2の状態が保圧時
間設定器42 (2)によって設定された時間だけ継続
した後、保圧圧力設定器40 (31によって設定され
た第3段圧力P3となり、これが保圧時間設定器42 
(s、によって設定された時間だけ保持される。以下、
同様にして、保圧圧力設定器40 (mlによって設定
された第m段圧力P。の圧力が保圧時間設定器42 (
m)によって設定された時間だけ保持された時点で保圧
工程が終了する。上述のように、保圧圧力設定器40(
1)によって設定された第1段圧力P1は時間に基づい
て制御されるのではなく、スクリュー12の後退量に基
づいて制御される。従って、樹脂材料の混線状態の変動
、金型温度の変動などが発生しても常に同じスクリュー
12の後退位置で第2段圧力P2への切換えか行われる
ことになる。これにより常に安定した成形を行うことが
でき、成形品重量のばらつきを減少させることができる
Because it is set much smaller than screw 1
2 is pushed back by the resin pressure on the mold side. When the retraction amount of the screw 12 matches the setting value of the screw retraction amount setting device 34, the control device 24 sets the electromagnetic pressure so that the holding pressure becomes the second stage pressure P2 set by the holding pressure setting device 40T21. Control valve 28 and electromagnetic flow control valve 30
control the operation of After this second stage pressure P2 continues for the time set by the holding pressure setting device 42 (2), it becomes the third stage pressure P3 set by the holding pressure setting device 40 (31), and this is the holding pressure. Time setting device 42
(It is retained for the time set by s. Below,
Similarly, the pressure of the m-th stage pressure P set by the holding pressure setting device 40 (ml) is adjusted to the holding pressure time setting device 42 (
The pressure holding process ends when the pressure is maintained for the time set by m). As mentioned above, the holding pressure setting device 40 (
The first stage pressure P1 set in step 1) is not controlled based on time, but based on the amount of retraction of the screw 12. Therefore, even if there is a change in the cross-wire state of the resin material, a change in the mold temperature, etc., the switching to the second stage pressure P2 is always performed at the same retracted position of the screw 12. As a result, stable molding can be performed at all times, and variations in the weight of molded products can be reduced.

なお、この実施例では充てん工程から保圧工程への切換
えはスクリュー12の位置信号に基づいて行うようにし
たが、スクリュー12の速度信号、射出シリンダ14の
油圧信号などを用いて保圧切換えを行っても、本発明を
同様に実施することができる。また、この実施例ではス
クリュー12の位置を射出シリンダ14によって制御す
るようにしであるが、電動機の回転力をボールねじ機構
などによって直進力に変換して射出制御を行う電動式射
出成形機の場合であっても、電動機のトルク及び回転数
を制御することにより同様の制御を行うことができるこ
とも明らかである。
In this embodiment, the switching from the filling process to the pressure holding process was performed based on the position signal of the screw 12, but the pressure holding process could also be performed using the speed signal of the screw 12, the oil pressure signal of the injection cylinder 14, etc. However, the present invention can be practiced similarly. Further, in this embodiment, the position of the screw 12 is controlled by the injection cylinder 14, but in the case of an electric injection molding machine in which injection control is performed by converting the rotational force of an electric motor into linear force by a ball screw mechanism, etc. However, it is clear that similar control can be performed by controlling the torque and rotational speed of the electric motor.

(ト)発明の詳細 な説明してきたように、本発明によると、保圧工程の第
1段圧力をスクリューが所定位置まで後退するまでの間
保持するようにしたので、保圧切換え時に発生するスク
リュー後退量を常に一定とすることができ、安定した成
形が可能となるという効果を得ることができる。
(g) As described in detail, according to the present invention, the first stage pressure of the holding pressure process is maintained until the screw retreats to a predetermined position, so that the pressure generated at the time of switching the holding pressure is reduced. The amount of screw retraction can be kept constant at all times, resulting in the effect that stable molding is possible.

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

第1図は本発明方法を実施する装置を示す図である。 10・・・シリンダ、12・・・スクリュー、14・・
・射出シリンダ、22・・・スクリュー位置検出器、2
4・・・制御装置、28・・・電磁圧力制御弁、30・
・・電磁流量制御弁、32・・・条件設定装置、34・
・・スクリュー後退量設定器、36゜)〜36.。、・
・・射出速度切換位置設定器群、38 (11〜36(
n−1+”・・速度設定器群、40 (11〜40 (
m)  ・・・保圧圧力設定器群、42 (21〜42
(1・・・保圧時間設定器群。
FIG. 1 shows an apparatus for carrying out the method of the invention. 10...Cylinder, 12...Screw, 14...
・Injection cylinder, 22...Screw position detector, 2
4...control device, 28...electromagnetic pressure control valve, 30.
・・Solenoid flow control valve, 32・・Condition setting device, 34・
...Screw retraction amount setting device, 36°) ~ 36. . ,・
... Injection speed switching position setter group, 38 (11 to 36 (
n-1+”...Speed setter group, 40 (11 to 40 (
m) ... Holding pressure setting device group, 42 (21 to 42
(1... Pressure holding time setting device group.

Claims (1)

【特許請求の範囲】[Claims] 保圧工程の第1段圧力が充てん工程時の圧力よりも低く
設定されているため充てん工程から保圧工程に切換わっ
た直後にスクリューが後退する状態が発生する射出成形
機の制御方法において、スクリューがあらかじめ設定さ
れた所定位置に後退するまで保圧工程の第1段圧力を保
持し、スクリューが所定位置まで後退した後は、保圧工
程の第2段圧力以下の圧力を各段ごとに設定された時間
保持して保圧工程を行うことを特徴とする射出成形機の
制御方法。
In a control method for an injection molding machine in which the screw retreats immediately after switching from the filling process to the pressure holding process because the first stage pressure of the pressure holding process is set lower than the pressure during the filling process, The first stage pressure of the holding process is maintained until the screw retreats to a preset position, and after the screw retreats to the predetermined position, the pressure is increased at each stage below the second stage pressure of the holding process. A method for controlling an injection molding machine, characterized in that a pressure holding process is performed by holding the pressure for a set time.
JP14829786A 1986-06-26 1986-06-26 Control of injection molder Granted JPS634926A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14829786A JPS634926A (en) 1986-06-26 1986-06-26 Control of injection molder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14829786A JPS634926A (en) 1986-06-26 1986-06-26 Control of injection molder

Publications (2)

Publication Number Publication Date
JPS634926A true JPS634926A (en) 1988-01-09
JPH0441894B2 JPH0441894B2 (en) 1992-07-09

Family

ID=15449626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14829786A Granted JPS634926A (en) 1986-06-26 1986-06-26 Control of injection molder

Country Status (1)

Country Link
JP (1) JPS634926A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03242439A (en) * 1990-02-16 1991-10-29 Mitsubishi Motors Corp Fuel blend rate detection method
WO2013051098A1 (en) * 2011-10-04 2013-04-11 東洋機械金属株式会社 Method of controlling pressure-maintaining step for injection-molding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03242439A (en) * 1990-02-16 1991-10-29 Mitsubishi Motors Corp Fuel blend rate detection method
WO2013051098A1 (en) * 2011-10-04 2013-04-11 東洋機械金属株式会社 Method of controlling pressure-maintaining step for injection-molding machine
JPWO2013051098A1 (en) * 2011-10-04 2015-03-30 東洋機械金属株式会社 Pressure holding process control method in injection molding machine

Also Published As

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JPH0441894B2 (en) 1992-07-09

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