JP2001287255A - Control method for injection molding machine - Google Patents

Control method for injection molding machine

Info

Publication number
JP2001287255A
JP2001287255A JP2000103421A JP2000103421A JP2001287255A JP 2001287255 A JP2001287255 A JP 2001287255A JP 2000103421 A JP2000103421 A JP 2000103421A JP 2000103421 A JP2000103421 A JP 2000103421A JP 2001287255 A JP2001287255 A JP 2001287255A
Authority
JP
Japan
Prior art keywords
heater
heating cylinder
temperature
resin
molding machine
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
JP2000103421A
Other languages
Japanese (ja)
Other versions
JP3794611B2 (en
Inventor
Akira Ito
晃 伊藤
Yoshihiko Makino
嘉彦 牧野
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries 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 Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP2000103421A priority Critical patent/JP3794611B2/en
Publication of JP2001287255A publication Critical patent/JP2001287255A/en
Application granted granted Critical
Publication of JP3794611B2 publication Critical patent/JP3794611B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a control method for an injection molding machine capable of stabilizing the back pressure of a screw at the time of metering regardless of a lot of a resin by making it possible to control a ratio of the melting of a resin caused by the heat generated by shearing and the melting of the resin caused by the heat of a heater. SOLUTION: A model of the back pressure of the screw at the time of metering when an excellent article is obtained is preliminarily calculated. A controller 13 controls a current supply control part 14 so as to approach the model at the time of actual molding and the current supply control part calculates a ratio of the quantity of heat generated by the heater 11 and the quantity of heat generated by shearing the resin in the model of the back pressure of the screw to control the temperature of a heating cylinder 10 so as to approach the ratio model.

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制御方
法に関し、特に加熱シリンダの温度制御方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an injection molding machine, and more particularly to a method for controlling a temperature of a heating cylinder.

【0002】[0002]

【従来の技術】射出成形機においては、加熱シリンダ内
で樹脂を溶融させ、この溶融樹脂を金型のキャビティ内
に射出して成形を行う。加熱シリンダの温度、溶融樹脂
の射出圧力や保圧等の制御の良し悪しは成型品の品質に
大きな影響を与える。このうち、特に加熱シリンダの温
度について言えば、内部の樹脂の溶融状態に影響を与え
る。
2. Description of the Related Art In an injection molding machine, a resin is melted in a heating cylinder, and the molten resin is injected into a cavity of a mold for molding. The control of the temperature of the heating cylinder, the injection pressure of the molten resin, the holding pressure, etc., has a great effect on the quality of the molded product. Of these, the temperature of the heating cylinder, in particular, affects the molten state of the resin inside.

【0003】射出成形機において樹脂を溶融する手段と
して次の2種類がある。
There are the following two types of means for melting a resin in an injection molding machine.

【0004】A.加熱シリンダの周囲に配設されたヒー
タに加えられる熱量による溶融。
A. Melting due to the amount of heat applied to the heater arranged around the heating cylinder.

【0005】B.加熱シリンダ内に配置されたスクリュ
によって樹脂がせん断されることにより発生する、いわ
ゆるせん断発熱による溶融。
B. Melting due to so-called shear heat generated when resin is sheared by a screw arranged in a heating cylinder.

【0006】通常の射出成形機では、上記の2つが合わ
さった状態で樹脂の溶融が行われており、それぞれの比
率が変わると樹脂の溶融状態も異なってくる。言い換え
れば、加熱シリンダ内の樹脂の溶融の割合は、Aによる
溶融と、Bによる溶融の割合が時間によってばらつくこ
とが避けられない。これによって、樹脂の溶融状態がば
らつき、計量時のスクリュ背圧・計量時間等がばらつい
てしまう。これらのばらつきは、成型品の品質がばらつ
く原因となる。
In an ordinary injection molding machine, the resin is melted in a state where the above two are combined, and the molten state of the resin changes when the ratio of each changes. In other words, the rate of melting of the resin in the heating cylinder is inevitable that the rate of melting by A and the rate of melting by B vary with time. As a result, the molten state of the resin varies, and the screw back pressure and the measuring time during measurement vary. These variations cause the quality of the molded product to vary.

【0007】一方、成形に用いる樹脂は、同じ種類であ
ってもロット毎に平均分子量や分子量の分布が微妙に異
なるために、同じ温度条件で可塑化しても樹脂の溶融状
態に違いが現れる。その結果、計量時のスクリュ背圧を
ロット毎に変える必要があった。これも成型品の品質が
ばらつく原因となる。
On the other hand, the average molecular weight and the distribution of molecular weights are slightly different from lot to lot even if the resin used for molding is the same kind, so that even if the resin is plasticized under the same temperature condition, a difference appears in the molten state of the resin. As a result, it was necessary to change the screw back pressure during weighing for each lot. This also causes the quality of the molded product to vary.

【0008】[0008]

【発明が解決しようとする課題】これまで、加熱シリン
ダの周囲に配設されたヒータの制御は以下のようにして
行われている。加熱シリンダには、その温度を検出する
ために熱電対等による温度センサが設置されている。そ
して、この温度センサからの検出信号に基づいてヒータ
への通電を制御するためのコントローラが備えられてい
る。コントローラは、ソリッドステートリレー(以下、
SSRと呼ぶ)のような通電制御手段を介してヒータへ
の通電を制御する。すなわち、加熱シリンダの温度を安
定に保つために、温度センサを用いて加熱シリンダの温
度を計測し、その結果から、ヒータに流す電流をコント
ロールしているSSRをコントローラで制御し、温度を
制御するようにしている。
Heretofore, control of a heater arranged around a heating cylinder has been performed as follows. The heating cylinder is provided with a temperature sensor such as a thermocouple for detecting the temperature. A controller is provided for controlling energization of the heater based on a detection signal from the temperature sensor. The controller is a solid state relay (hereinafter
The power supply to the heater is controlled through power supply control means such as SSR. That is, in order to keep the temperature of the heating cylinder stable, the temperature of the heating cylinder is measured using a temperature sensor, and based on the result, the SSR controlling the current flowing through the heater is controlled by the controller to control the temperature. Like that.

【0009】しかし、温度条件が同じでロットの異なる
樹脂を用いた場合、前に述べたように、加熱シリンダ内
の樹脂の溶融状態の割合(せん断発熱とヒータ発熱との
割合)が異なる。その結果、計量時のスクリュ背圧が樹
脂のロットにより異なってしまう。これに対して、従来
は熟練技能者が成型品の品質を確認しながら、加熱シリ
ンダの温度設定又はスクリュ背圧を手動で変えて対処し
ており、熟練を必要としていた。
However, when resins of different lots are used under the same temperature conditions, as described above, the ratio of the molten state of the resin in the heating cylinder (the ratio of shear heat generation and heater heat generation) differs. As a result, the screw back pressure at the time of measurement differs depending on the lot of the resin. On the other hand, conventionally, a skilled technician has to manually change the temperature setting of the heating cylinder or the screw back pressure while checking the quality of the molded product, which requires skill.

【0010】そこで、本発明の課題は、樹脂のせん断発
熱による溶融とヒータ発熱による溶融の割合を制御でき
るようにして、樹脂のロットによらずに計量時の背圧を
安定させることのできる射出成形機の制御方法を提供す
ることにある。
Accordingly, an object of the present invention is to provide an injection capable of stabilizing the back pressure at the time of weighing regardless of the lot of the resin by controlling the ratio of the melting caused by the shear heat of the resin and the melting caused by the heater. An object of the present invention is to provide a method for controlling a molding machine.

【0011】[0011]

【課題を解決するための手段】本発明による射出成形機
の制御方法は、加熱シリンダの周囲にヒータが配設され
ると共に、温度センサが設置され、前記温度センサから
の検出信号を受けて前記ヒータへの通電を通電制御手段
を介して制御するコントローラを備えた射出成形機にお
いて、あらかじめ良品が得られる時の計量時のスクリュ
背圧のモデルを求めておき、前記コントローラは、実成
形に際しては、前記スクリュ背圧のモデルに近付くよう
に前記通電制御手段を制御し、しかも該通電制御手段は
スクリュ背圧のモデルにおけるヒータによる発熱量と樹
脂のせん断発熱量との比率を求めておき、その比率モデ
ルに近付くように前記加熱シリンダの温度を制御するこ
とを特徴とする。
According to a method of controlling an injection molding machine according to the present invention, a heater is provided around a heating cylinder, a temperature sensor is provided, and a detection signal is received from the temperature sensor. In an injection molding machine equipped with a controller that controls energization of a heater through an energization control unit, a model of a screw back pressure at the time of measurement when a non-defective product is obtained is obtained in advance, and the controller is used for actual molding. Controlling the energization control means so as to approach the model of the screw back pressure, and the energization control means obtains the ratio between the calorific value of the heater in the model of the screw back pressure and the shear calorific value of the resin. The temperature of the heating cylinder is controlled so as to approach a ratio model.

【0012】特に、前記加熱シリンダ内に樹脂が充填さ
れしかもスクリュを回転させない状態にて、前記ヒータ
により発生される熱量と前記加熱シリンダの温度との対
応関係をあらかじめ計測しておき、前記コントローラ
は、実成形において前記スクリュを回転させた状態にて
得られる前記温度センサからの検出信号を受け、前記通
電制御手段により前記ヒータに与えられた電流及び時間
とに基づいて前記ヒータにより発生される熱量を算出す
ると共に、前記対応関係と算出された熱量とに基づい
て、実成形において検出された加熱シリンダ温度とヒー
タの発熱による温度上昇分との差又は割合を前記せん断
発熱による温度上昇分として算出し、更にロギングデー
タとして出力することを特徴とする。
In particular, in a state in which the heating cylinder is filled with resin and the screw is not rotated, the correspondence between the amount of heat generated by the heater and the temperature of the heating cylinder is measured in advance, and the controller determines The amount of heat generated by the heater based on the current and time supplied to the heater by the power supply control means, upon receiving a detection signal from the temperature sensor obtained in a state where the screw is rotated in actual molding. And the difference or ratio between the heating cylinder temperature detected in the actual molding and the temperature rise due to the heat generated by the heater is calculated as the temperature rise due to the shear heat based on the correspondence and the calorie calculated. In addition, the data is output as logging data.

【0013】[0013]

【発明の実施の形態】図1を参照して、本発明の実施の
形態について説明する。図1において、加熱シリンダ1
0の周囲にはヒータ11が配設されている。図1ではヒ
ータ11は象徴的に1個のみ示しているが、実際には加
熱シリンダ10の軸方向に間隔をおいて複数箇所に設置
される。ヒータ11には、その温度を加熱シリンダ10
の温度として検出するために熱電対等による温度センサ
12が設置されている。そして、温度センサ12からの
検出信号及び後述する情報に基づいてヒータ11への通
電を制御するためのコントローラ13が備えられてい
る。コントローラ13は、SSRによる通電制御部14
を介してヒータ11への通電を制御する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In FIG. 1, a heating cylinder 1
A heater 11 is provided around 0. Although only one heater 11 is shown symbolically in FIG. 1, actually, the heater 11 is installed at a plurality of locations at intervals in the axial direction of the heating cylinder 10. The heater 11 is supplied with the temperature of the heating cylinder 10.
A temperature sensor 12 such as a thermocouple is provided to detect the temperature as a temperature. Further, a controller 13 is provided for controlling energization of the heater 11 based on a detection signal from the temperature sensor 12 and information described later. The controller 13 includes a power supply control unit 14 based on the SSR.
The power supply to the heater 11 is controlled via the.

【0014】本発明による制御方法は以下のようにして
実行される。
The control method according to the present invention is executed as follows.

【0015】(1)条件出し作業において良品が得られ
た時のスクリュ背圧モデルをあらかじめ基準モデルとし
て求めておく。この基準モデルは、1ショット当たりの
スクリュ位置とスクリュ背圧との対応関係を示してお
り、コントローラ13内のメモリに保存される。また、
スクリュ背圧のモデルにおけるヒータによる発熱量と樹
脂のせん断発熱量との比率モデルを求めておく。この比
率モデルは、1ショット当たりのスクリュ位置に対する
前記ヒータによる発熱量と樹脂によるせん断発熱量の比
率を示しており、コントローラ13内のメモリに保存さ
れる。なお、スクリュ位置は既設のスクリュ位置センサ
で知ることができ、スクリュ背圧は既設のスクリュ背圧
で知ることができる。
(1) A screw back pressure model when a non-defective product is obtained in the condition setting work is obtained in advance as a reference model. This reference model indicates the correspondence between the screw position per shot and the screw back pressure, and is stored in the memory in the controller 13. Also,
A model of the ratio of the calorific value by the heater to the shear calorific value of the resin in the screw back pressure model is obtained in advance. This ratio model indicates the ratio of the amount of heat generated by the heater and the amount of heat generated by shearing by the resin to the screw position per shot, and is stored in the memory in the controller 13. In addition, the screw position can be known by the existing screw position sensor, and the screw back pressure can be known by the existing screw back pressure.

【0016】図2は求められた基準モデルの一例を示
す。
FIG. 2 shows an example of the obtained reference model.

【0017】(2)コントローラ13は、実成形に際し
ては、上記の基準モデルに近付くように通電制御部14
を制御する。図3は、実成形における1ショット当たり
のスクリュ位置とスクリュ背圧との対応関係の一例を示
している。前に述べた理由で、実際のスクリュ位置とス
クリュ背圧との対応関係と、図2に示された基準モデル
との間には差が生じる。コントローラ13は、1ショッ
トの間にスクリュ位置センサから得られるスクリュ位置
とスクリュ背圧センサから得られるスクリュ背圧をサン
プリングしてこれらの対応関係を基準モデルと比較す
る。そして、実際の対応関係と基準モデルとの間の差を
無くすように通電制御部14を制御する。
(2) During actual molding, the controller 13 controls the energization control unit 14 so as to approach the reference model.
Control. FIG. 3 shows an example of the correspondence between the screw position per shot and the screw back pressure in actual molding. For the reasons described above, there is a difference between the correspondence between the actual screw position and the screw back pressure and the reference model shown in FIG. The controller 13 samples the screw position obtained from the screw position sensor and the screw back pressure obtained from the screw back pressure sensor during one shot, and compares the corresponding relationship with the reference model. Then, the power supply control unit 14 is controlled so as to eliminate the difference between the actual correspondence and the reference model.

【0018】すなわち、上記の制御に際しては、通電制
御部14に対する制御ゲインを、上記比率モデルから加
熱シリンダ10内の樹脂のせん断発熱量とヒータ11の
発熱量の割合を求めて、その割合に近付くように制御す
る。
That is, in the above control, the control gain for the energization control unit 14 is calculated from the ratio model to obtain the ratio between the amount of heat generated by the resin in the heating cylinder 10 and the amount of heat generated by the heater 11, and approaches the ratio. Control.

【0019】せん断発熱による温度上昇分の算出は以下
のようにして行われる。
The calculation of the temperature rise due to shear heat is performed as follows.

【0020】(A)あらかじめ、せん断発熱させない場
合、すなわち加熱シリンダ10内に樹脂を充填ししかも
スクリュを回転させない場合における、ヒータ11によ
り発生される熱量(ヒータに流れる電流値と通電時間と
により算出される)とヒータ11における温度上昇、す
なわち加熱シリンダ10の温度上昇(温度センサ12の
検出値)との対応関係を求めておく。この対応関係もコ
ントローラ13内のメモリに保存される。図3は、上記
の対応関係の一例を示す。
(A) The amount of heat generated by the heater 11 (calculated from the value of the current flowing through the heater and the energizing time) when no shear heat is generated in advance, that is, when the resin is filled in the heating cylinder 10 and the screw is not rotated. ) And the temperature rise in the heater 11, that is, the temperature rise of the heating cylinder 10 (the value detected by the temperature sensor 12) is determined in advance. This correspondence is also stored in the memory in the controller 13. FIG. 3 shows an example of the above correspondence.

【0021】(B)実成形に入ると、コントローラ13
は温度センサ12による検出温度をサンプリングして記
憶すると共に、ヒータ11に流される電流とその時間と
によりヒータ11で発生される熱量を上記サンプリング
周期で算出して記憶する。
(B) When the actual molding starts, the controller 13
Samples the temperature detected by the temperature sensor 12 and stores it, and calculates and stores the amount of heat generated by the heater 11 based on the current flowing through the heater 11 and the time thereof in the sampling cycle.

【0022】(C)コントローラ13は更に、上記
(A)、(B)で得られた情報、すなわち前記対応関係
と算出された熱量とに基づいて、実成形において検出さ
れた加熱シリンダ温度とヒータ11の発熱による温度上
昇分との差又は割合をせん断発熱による温度上昇分とし
て算出して出力する。これはプリンタにより記録した
り、ディスプレイにて表示することができる。
(C) The controller 13 further calculates the heating cylinder temperature and the heater temperature detected in the actual molding on the basis of the information obtained in the above (A) and (B), ie, the correspondence and the calculated heat quantity. The difference or ratio from the temperature rise due to the heat generation of No. 11 is calculated and output as the temperature rise due to the shear heat. This can be recorded by a printer or displayed on a display.

【0023】図5には、実際の加熱シリンダ10の温度
上昇(せん断発熱よる上昇分を含む)とヒータ11の発
熱量との関係の一例を示す。ここで、図4に示されたあ
るヒータ発熱量での加熱シリンダ温度と、図3に示され
た上記あるヒータ発熱量での加熱シリンダ温度との差又
は割合が、せん断発熱によるものであることは明らかで
ある。
FIG. 5 shows an example of the relationship between the actual temperature rise of the heating cylinder 10 (including the rise due to shear heat generation) and the amount of heat generated by the heater 11. Here, the difference or ratio between the heating cylinder temperature at a certain heater heating value shown in FIG. 4 and the heating cylinder temperature at the certain heater heating value shown in FIG. 3 is due to shear heating. Is clear.

【0024】このようにして、上記の対応関係からせん
断発熱分を知ることができ、その推移を知ることもでき
る。これは、樹脂の溶融状態を左右しているせん断発熱
とヒータ11の発熱との割合の変化の推移が分かること
を意味する。せん断発熱分の推移は、コントローラ13
から成型品の品質情報の1つとして出力される。
In this way, it is possible to know the shear heat generation from the above-mentioned correspondence, and also to know its transition. This means that the change in the ratio between the shear heat and the heat generated by the heater 11 that determines the molten state of the resin can be understood. The change in the amount of shear heat is determined by the controller 13.
Is output as one of the quality information of the molded product.

【0025】(D)上記のようにして、せん断発熱量と
ヒータによる発熱量とを求め、それらを前記比率モデル
に近付くように制御ゲインによってヒータ11への通電
が制御されることにより、樹脂のせん断発熱による溶融
とヒータ11の発熱による溶融の割合が制御される。そ
の結果、樹脂のロットが変わっても樹脂の溶融状態が安
定し、計量時のスクリュ背圧が基準モデルに近付いて安
定する。
(D) As described above, the amount of heat generated by the shear and the amount of heat generated by the heater are determined, and the energization to the heater 11 is controlled by the control gain so as to approach the ratio model. The ratio of melting due to shear heat and melting due to heat generated by the heater 11 is controlled. As a result, even if the lot of the resin changes, the molten state of the resin is stabilized, and the screw back pressure at the time of the measurement approaches the reference model and is stabilized.

【0026】本形態によれば、加熱シリンダ10の温度
とヒータ11に流す電流を調整している通電制御部14
の出力とにより、加熱シリンダ10の温度上昇における
せん断発熱の割合がわかる。よって、コントローラ13
の出力により、せん断発熱の推移がわかり、樹脂の溶融
状態の推移を知ることができると共に、成型品の品質情
報として出力することができる。勿論、上記(1)、
(3)、(A)〜(C)におけるヒータ11の温度設定
条件は同じである。
According to the present embodiment, the energization control unit 14 that adjusts the temperature of the heating cylinder 10 and the current flowing through the heater 11
The output of (1) indicates the ratio of the shear heat generated when the temperature of the heating cylinder 10 rises. Therefore, the controller 13
With the output of (1), the transition of the heat generated by shearing can be known, the transition of the molten state of the resin can be known, and the quality information of the molded product can be output. Of course, the above (1),
(3) The temperature setting conditions of the heater 11 in (A) to (C) are the same.

【0027】なお、コントローラ13は、射出成形機本
体を制御するために備えられている制御装置で実現する
ことのできるし、この制御装置とは別に専用に備えられ
ても良い。また、本発明は、油圧式、電動式のいずれの
タイプの射出成形機にも適用できることは言うまでも無
い。
The controller 13 can be realized by a control device provided for controlling the main body of the injection molding machine, or may be provided separately from this control device. Needless to say, the present invention can be applied to both hydraulic and electric injection molding machines.

【0028】[0028]

【発明の効果】本発明によれば、樹脂のロットが変わっ
ても加熱シリンダにおけるヒータによる樹脂溶融とせん
断発熱による樹脂溶融との割合を安定させることができ
て樹脂の溶融状態を均一にすることができるので、計量
時のスクリュ背圧が安定し、もって成型品の品質のばら
つきを無くすことができる。また、せん断発熱の推移も
ロギングデータとして知ることができる。
According to the present invention, even if the lot of the resin changes, the ratio of the melting of the resin by the heater in the heating cylinder and the melting of the resin by the shear heat can be stabilized, and the molten state of the resin can be made uniform. Therefore, the screw back pressure at the time of weighing is stabilized, and the variation in the quality of the molded product can be eliminated. Also, the transition of the shear heat can be known as logging data.

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

【図1】本発明による制御方法を実施するための構成を
示したブロック図である。
FIG. 1 is a block diagram showing a configuration for implementing a control method according to the present invention.

【図2】本発明において求められる計量時のスクリュ背
圧とスクリュ位置との関係の基準モデルの一例を示した
図である。
FIG. 2 is a diagram showing an example of a reference model of a relationship between a screw back pressure and a screw position at the time of measurement, which is obtained in the present invention.

【図3】実成形における計量時のスクリュ背圧とスクリ
ュ位置との関係の例を示した図である。
FIG. 3 is a diagram illustrating an example of a relationship between a screw back pressure and a screw position during weighing in actual molding.

【図4】スクリュを回転させずヒータのみの発熱で樹脂
の溶融を行った場合のヒータ発熱量と加熱シリンダ温度
との関係を示した図である。
FIG. 4 is a diagram showing a relationship between a heating value of a heater and a heating cylinder temperature in a case where a resin is melted only by a heater without rotating a screw.

【図5】スクリュを回転させてせん断発熱とヒータの発
熱で樹脂の溶融を行った場合のヒータ発熱量と加熱シリ
ンダ温度との関係を示した図である。
FIG. 5 is a diagram showing a relationship between a heating value of a heater and a heating cylinder temperature when a resin is melted by shearing heat generation and heat generation of a heater by rotating a screw.

【符号の説明】[Explanation of symbols]

10 加熱シリンダ 11 ヒータ 12 温度センサ 13 コントローラ 14 通電制御部 Reference Signs List 10 heating cylinder 11 heater 12 temperature sensor 13 controller 14 energization control unit

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 加熱シリンダの周囲にヒータが配設され
ると共に、温度センサが設置され、前記温度センサから
の検出信号を受けて前記ヒータへの通電を通電制御手段
を介して制御するコントローラを備えた射出成形機にお
いて、 あらかじめ良品が得られる時の計量時のスクリュ背圧の
モデルを求めておき、 前記コントローラは、実成形に際しては、前記スクリュ
背圧のモデルに近付くように前記通電制御手段を制御
し、しかも該通電制御手段はスクリュ背圧のモデルにお
けるヒータによる発熱量と樹脂のせん断発熱量との比率
を求めておき、その比率モデルに近付くように前記加熱
シリンダの温度を制御することを特徴とする射出成形機
の制御方法。
A heater is provided around a heating cylinder, a temperature sensor is provided, and a controller that receives a detection signal from the temperature sensor and controls energization to the heater through energization control means is provided. In the injection molding machine provided, a model of the screw back pressure at the time of measurement when a good product is obtained is obtained in advance, and the controller controls the energization control means so as to approach the model of the screw back pressure during actual molding. In addition, the power supply control means obtains a ratio between a calorific value of the heater in the model of the screw back pressure and a shearing calorific value of the resin, and controls the temperature of the heating cylinder so as to approach the ratio model. A control method for an injection molding machine, characterized in that:
【請求項2】 請求項1記載の射出成形機の制御方法に
おいて、 前記加熱シリンダ内に樹脂が充填されしかもスクリュを
回転させない状態にて、前記ヒータにより発生される熱
量と前記加熱シリンダの温度との対応関係をあらかじめ
計測しておき、 前記コントローラは、実成形において前記スクリュを回
転させた状態にて得られる前記温度センサからの検出信
号を受け、前記通電制御手段により前記ヒータに与えら
れた電流及び時間とに基づいて前記ヒータにより発生さ
れる熱量を算出し、更に前記対応関係と算出された熱量
とに基づいて、実成形において検出された加熱シリンダ
温度とヒータの発熱による温度上昇分との差又は割合を
前記せん断発熱による温度上昇分として算出し、更にロ
ギングデータとして出力することを特徴とする射出成形
機の制御方法。
2. The method of controlling an injection molding machine according to claim 1, wherein the amount of heat generated by the heater, the temperature of the heating cylinder, and the temperature of the heating cylinder are set in a state in which the heating cylinder is filled with resin and the screw is not rotated. The controller receives a detection signal from the temperature sensor obtained in a state where the screw is rotated in actual molding, receives a detection signal from the temperature sensor, and supplies a current supplied to the heater by the energization control unit. And the amount of heat generated by the heater based on the time, and further, based on the correspondence and the calculated amount of heat, the heating cylinder temperature detected in actual molding and the temperature rise due to the heat generated by the heater. The difference or ratio is calculated as a temperature rise due to the shear heating, and further output as logging data. Control method for a molding machine.
【請求項3】 請求項2記載の射出成形機の制御方法に
おいて、前記通電制御手段はソリッドステートリレーで
あることを特徴とする射出成形機の制御方法。
3. The control method for an injection molding machine according to claim 2, wherein said energization control means is a solid state relay.
【請求項4】 請求項1あるいは2記載の射出成形機の
制御方法において、前記算出された差又は割合を成型品
の品質情報として記録あるいは表示することを特徴とす
る射出成形機の制御方法。
4. The method for controlling an injection molding machine according to claim 1, wherein the calculated difference or ratio is recorded or displayed as quality information of a molded product.
JP2000103421A 2000-04-05 2000-04-05 Control method of injection molding machine Expired - Fee Related JP3794611B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000103421A JP3794611B2 (en) 2000-04-05 2000-04-05 Control method of injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000103421A JP3794611B2 (en) 2000-04-05 2000-04-05 Control method of injection molding machine

Publications (2)

Publication Number Publication Date
JP2001287255A true JP2001287255A (en) 2001-10-16
JP3794611B2 JP3794611B2 (en) 2006-07-05

Family

ID=18617139

Family Applications (1)

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

Country Link
JP (1) JP3794611B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7261538B2 (en) 2003-02-24 2007-08-28 Fanuc Ltd Monitoring device for an injection molding machine
JP2013001015A (en) * 2011-06-17 2013-01-07 Fanuc Ltd Temperature control device for injection molding machine including feedforward function
JP2021020382A (en) * 2019-07-29 2021-02-18 ファナック株式会社 Temperature control device for injection molding machine having abnormality detecting function

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7261538B2 (en) 2003-02-24 2007-08-28 Fanuc Ltd Monitoring device for an injection molding machine
JP2013001015A (en) * 2011-06-17 2013-01-07 Fanuc Ltd Temperature control device for injection molding machine including feedforward function
JP2021020382A (en) * 2019-07-29 2021-02-18 ファナック株式会社 Temperature control device for injection molding machine having abnormality detecting function
JP7260434B2 (en) 2019-07-29 2023-04-18 ファナック株式会社 Temperature control device for injection molding machine with abnormality detection function

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