JPH0565333B2 - - Google Patents
Info
- Publication number
- JPH0565333B2 JPH0565333B2 JP59084648A JP8464884A JPH0565333B2 JP H0565333 B2 JPH0565333 B2 JP H0565333B2 JP 59084648 A JP59084648 A JP 59084648A JP 8464884 A JP8464884 A JP 8464884A JP H0565333 B2 JPH0565333 B2 JP H0565333B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- molding operation
- heating cylinder
- temperature controller
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/74—Heating or cooling of the injection unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は射出成形機、加熱シリンダを有する成
形機等に応用できるスクリユシリンダの温度制御
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for controlling the temperature of a screw cylinder, which can be applied to injection molding machines, molding machines having heating cylinders, and the like.
（従来技術）
第１図は従来の射出成形機の側断面図を示し、
１は加熱シリンダ、２はスクリユ、３はバンドヒ
ータ、４は熱電対、５はノズル、６はホツパ、７
は温調計を示す。(Prior art) Figure 1 shows a side sectional view of a conventional injection molding machine.
1 is a heating cylinder, 2 is a screw, 3 is a band heater, 4 is a thermocouple, 5 is a nozzle, 6 is a hopper, 7
indicates a temperature controller.
さてホツパ６からの原料は、その自重によつて
加熱シリンダ１の内部１ａに落下し、スクリユ２
の回転により混練されつつ、その溝に沿つて加熱
シリンダ１の先端部１ｂに送られる。この際原料
は加熱シリンダ１の外周に装着されたバンドヒー
タ３によつて加熱されると共に、混練作用によつ
て発生する摩擦熱が加わつて内部からも温度上昇
して溶融状態となり、加熱シリンダ１の先端部１
ｂに溶融樹脂が貯えられるにつれて、その反力
（背圧）によりスクリユ２は後方に押戻される。 Now, the raw material from the hopper 6 falls into the interior 1a of the heating cylinder 1 due to its own weight, and the raw material from the hopper 6 falls into the interior 1a of the heating cylinder 1.
While being kneaded by the rotation, the mixture is sent to the tip 1b of the heating cylinder 1 along the groove. At this time, the raw material is heated by the band heater 3 attached to the outer periphery of the heating cylinder 1, and the frictional heat generated by the kneading action is added to the raw material, causing the temperature to rise from the inside and become molten. Tip part 1
As the molten resin is stored in b, the screw 2 is pushed back rearward by its reaction force (back pressure).
この後退量を図示しないリミツトスイツチ等に
より感知し、スクリユ２の回転を設定位置で停止
させることにより射出量をきめる。この後図示し
ない金型が閉じられて射出工程に入る。この時図
示しない油圧シリンダ（射出シリンダ）によつ
て、スクリユ２に射出力が加えられ、同スクリユ
２は射出プランジヤとなつて、加熱シリンダ１の
先端部にあるノズル５より金型内に溶融樹脂を射
出する。またバンドヒータ３は３〜５個のグルー
プに分けられ、各グループ毎に加熱ゾーンを構成
し、各ゾーンに対応して熱電対４、温調計７があ
る。 The amount of retraction is sensed by a limit switch (not shown) or the like, and the rotation of the screw 2 is stopped at a set position to determine the amount of injection. After this, the mold (not shown) is closed and the injection process begins. At this time, an injection force is applied to the screw 2 by a hydraulic cylinder (injection cylinder) not shown, and the screw 2 acts as an injection plunger to inject the molten resin into the mold from the nozzle 5 at the tip of the heating cylinder 1. Inject. Furthermore, the band heaters 3 are divided into three to five groups, each group forming a heating zone, and a thermocouple 4 and a temperature controller 7 are provided corresponding to each zone.
しかしながら前記第１図の従来の射出成形機で
は、何らかの異常で成形運転を中断した場合で
も、温調計の設定温度は成形運転中のままである
ので、高温度の樹脂が長時間同じ場所に停滞する
ことになり、樹脂の種類によつては、熱分解をお
こして成形品の黒条、やけ、その他の外観欠陥を
生ずる欠点があつた。また運転中断時に、バンド
ヒータの電源を切つてしまうと、樹脂温が下がり
過ぎ、再運転時に昇温に時間がかかる欠点があつ
た。 However, in the conventional injection molding machine shown in Fig. 1, even if the molding operation is interrupted due to some abnormality, the set temperature of the temperature controller remains in the molding operation, so the high temperature resin remains in the same place for a long time. Depending on the type of resin, thermal decomposition may occur, resulting in black streaks, burns, and other appearance defects on molded products. Furthermore, if the power to the band heater is turned off when the operation is interrupted, the resin temperature will drop too much and it will take time to raise the temperature when restarting the operation.
（発明が解決しようとする問題点）
本発明は前記従来の欠点を解消するために提案
されたもので、樹脂が熱分解を起こすのを防止し
て成形品に黒条、やけ等の発生するのを防止し成
形品の品質の向上を図ることを目的とするもので
ある。(Problems to be Solved by the Invention) The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and it prevents the thermal decomposition of the resin and causes black streaks, stains, etc. on the molded product. The purpose is to prevent this and improve the quality of molded products.
（問題点を解決するための手段）
この目的を達成するために本発明は、加熱シリ
ンダ内に供給された樹脂をスクリユの回転により
混練しつつ加熱シリンダの先端部に溶融樹脂とし
て貯え、先端のノズルより金型内に射出するよう
にし、かつ前記加熱シリンダの外周に数グループ
に分けられたバンドヒータを設け、同バンドヒー
タの各グループ毎に加熱ゾーンを構成し、同各ゾ
ーンに対応して熱電対及び温調計を設けた成形機
において、前記温調計の制御温度を通常成形運転
時温度T1と、成形運転中断時温度T2に設定した
２段式温調計とすると共に、無人運転中に異常発
生を検知すると、この検知した信号により成形運
転を中断し、成形運転時温度を中断時温度に下げ
るようにしてなるもので、これを問題点解決のた
めの手段とするものである。(Means for solving the problem) In order to achieve this object, the present invention kneads the resin supplied into the heating cylinder by rotating the screw and stores it as molten resin at the tip of the heating cylinder. Injection is made into the mold from a nozzle, and band heaters divided into several groups are provided on the outer periphery of the heating cylinder, and each group of the band heaters constitutes a heating zone, and a heating zone is formed corresponding to each zone. In a molding machine equipped with a thermocouple and a temperature controller, the control temperature of the temperature controller is set to a temperature T1 during normal molding operation and a temperature T2 during interruption of molding operation, and a two-stage temperature controller, When an abnormality is detected during unattended operation, the molding operation is interrupted based on the detected signal, and the temperature during the molding operation is lowered to the temperature at the time of interruption.This is a means to solve the problem. It is.
（作用）
さて前記構成において、温調計の通常成形運転
時温度T1で成形運転中、何らかの異常で成形中
断した時には、成形運転中断時温度T2に制御温
度を自動的に切替える。(Function) Now, in the above configuration, when molding is interrupted due to some abnormality during the molding operation at the temperature T 1 during the normal molding operation of the temperature controller, the control temperature is automatically switched to the temperature T 2 at the time of interruption of the molding operation.
（実施例）
以下本発明の実施例を図面について説明する
と、第２図は本発明の実施例を示す。なお、第２
図において、前述の従来構造と同一の部分につい
ては、同一の符号を付し、その詳細な説明は省略
する。即ち、１は加熱シリンダ、１ａは内部、１
ｂは先端部、２はスクリユ、３はバンドヒータ、
４は熱電対、５はノズル、６はホツパである。第
２図において第１図の従来のものと相違する点
は、温調計７の代りに２段設定式の温調計１１を
使用した点である。(Example) An example of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of the present invention. In addition, the second
In the figures, parts that are the same as those in the conventional structure described above are designated by the same reference numerals, and detailed explanation thereof will be omitted. That is, 1 is the heating cylinder, 1a is the inside, 1
b is the tip, 2 is the screw, 3 is the band heater,
4 is a thermocouple, 5 is a nozzle, and 6 is a hopper. The difference in FIG. 2 from the conventional one shown in FIG. 1 is that a two-stage temperature controller 11 is used in place of the temperature controller 7.
次に以上の如く構成された実施例について作用
を説明すると、２段設定式温調計１１の１段を通
常成形運転温度をT1に設定し、他の１段を成形
運転中断時の温度としてT2に設定する。なお、
T1＞T2の関係とする。 Next, to explain the operation of the embodiment configured as above, one stage of the two-stage temperature controller 11 is set to the normal molding operation temperature, and the other stage is set to the temperature at the time of interruption of the molding operation. Set to T 2 as . In addition,
The relationship is T 1 > T 2 .
ここで通常成形運転中は、加熱シリンダ１の温
度は、設定温度T1になる様温調計１１により制
御されている。そして成形運転中何らかの以上に
より成形運転を中断した場合には、図示しない他
の制御部より、温調計１１に成形運転中断の信号
が入る。 During the normal molding operation, the temperature of the heating cylinder 1 is controlled by the temperature controller 11 so as to reach the set temperature T1 . If the molding operation is interrupted for some reason during the molding operation, a signal to interrupt the molding operation is input to the temperature controller 11 from another control section (not shown).
温調計１１に前記のような信号が入ると、温調
計１１の制御温度はT2に切替り、加熱シリンダ
１はT2温度に保たれる。また温調計１１に図示
しない他の制御部より成形運転の信号が入ると、
温調計１１の制御温度はT1に切替り、加熱シリ
ンダ１はT1温度に保たれる。 When the above signal is input to the temperature controller 11, the control temperature of the temperature controller 11 is switched to T2 , and the heating cylinder 1 is maintained at the T2 temperature. Furthermore, when a molding operation signal is input to the temperature controller 11 from another control section (not shown),
The control temperature of the temperature controller 11 is switched to T1 , and the heating cylinder 1 is maintained at the T1 temperature.
（発明の効果）
以上詳細に説明した如く本発明は、温調計の制
御温度を通常成形運転時温度T1と、成形運転中
断時温度T2に設定した２段式温調計とすると共
に、無人運転中に異常発生を検知すると、この検
知した信号により成形運転を中断し、成形運転時
温度を中断時温度に下げるようにしたので、樹脂
の物性が悪化するのを防止することができ、成形
品に黒条、やけ等が発生するのを防ぎ、成形品の
品質向上を図ることができる。従つて従来の如く
バンドヒータの電源を切つて樹脂温度が下がり過
ぎることにより、再運転時に樹脂温度が設定温度
に上がるまで待つような必要はなく、再運転時の
立上げ時間を短縮することができ、生産性が向上
する。(Effects of the Invention) As explained in detail above, the present invention provides a two-stage temperature controller in which the control temperature of the temperature controller is set to the temperature T 1 during normal molding operation and the temperature T 2 during interruption of molding operation. When an abnormality is detected during unattended operation, the molding operation is interrupted based on the detected signal and the temperature during the molding operation is lowered to the temperature at the time of interruption, which prevents the physical properties of the resin from deteriorating. , it is possible to prevent black streaks, discoloration, etc. from occurring in the molded product, and to improve the quality of the molded product. Therefore, there is no need to turn off the power to the band heater and wait until the resin temperature rises to the set temperature when restarting operation, as in the past, and the start-up time at restarting can be shortened. and improve productivity.
第１図は従来の射出成形機１の１例を示す側断
面図、第２図は本発明の実施例を示す射出成形機
の側断面図である。
図の主要部分の説明、１……加熱シリンダ、２
……スクリユ、３……バンドヒータ、４……熱電
対、５……ノズル、６……ホツパ、１１……２段
設定式温調計。
FIG. 1 is a side sectional view showing an example of a conventional injection molding machine 1, and FIG. 2 is a side sectional view of an injection molding machine showing an embodiment of the present invention. Explanation of the main parts of the figure, 1... Heating cylinder, 2
... Screw, 3 ... Band heater, 4 ... Thermocouple, 5 ... Nozzle, 6 ... Hopper, 11 ... Two-stage temperature controller.
Claims (1)
の回転により混練しつつ加熱シリンダの先端部に
溶融樹脂として貯え、先端のノズルより金型内に
射出するようにし、かつ前記加熱シリンダの外周
に数グループに分けられたバンドヒータを設け、
同バンドヒータの各グループ毎に加熱ゾーンを構
成し、同各ゾーンに対応して熱電対及び温調計を
設けた成形機において、前記温調計の制御温度を
通常成形運転時温度T1と、成形運転中断時温度
T2に設定した２段式温調計とすると共に、無人
運転中に異常発生を検知すると、この検知した信
号により成形運転を中断し、成形運転時温度を中
断時温度に下げることを特徴とするスクリユシリ
ンダの温度制御方法。1. The resin supplied into the heating cylinder is kneaded by the rotation of the screw and stored as molten resin at the tip of the heating cylinder, and is injected into the mold from the nozzle at the tip, and several groups are formed on the outer periphery of the heating cylinder. A band heater divided into
In a molding machine in which heating zones are configured for each group of band heaters and thermocouples and temperature controllers are installed corresponding to each zone, the control temperature of the temperature controller is set to the temperature T 1 during normal molding operation. , temperature when molding operation is interrupted
It has a two-stage temperature controller set to T 2 , and when an abnormality is detected during unattended operation, the molding operation is interrupted by the detected signal and the temperature during the molding operation is lowered to the temperature at the time of interruption. Temperature control method for screw cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8464884A JPS60242029A (en) | 1984-04-26 | 1984-04-26 | Method of controlling temperature of screw cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8464884A JPS60242029A (en) | 1984-04-26 | 1984-04-26 | Method of controlling temperature of screw cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60242029A JPS60242029A (en) | 1985-12-02 |
| JPH0565333B2 true JPH0565333B2 (en) | 1993-09-17 |
Family
ID=13836518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8464884A Granted JPS60242029A (en) | 1984-04-26 | 1984-04-26 | Method of controlling temperature of screw cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60242029A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62211120A (en) * | 1986-03-12 | 1987-09-17 | Fanuc Ltd | Injection molder provided with temperature control of heating cylinder upon generation of abnormality |
| JPH07267Y2 (en) * | 1988-08-22 | 1995-01-11 | 三菱重工業株式会社 | Cylinder temperature control device |
| JPH0518121Y2 (en) * | 1989-03-29 | 1993-05-14 | ||
| JPH0520511Y2 (en) * | 1989-11-07 | 1993-05-27 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5421574Y2 (en) * | 1973-08-14 | 1979-07-31 | ||
| JPS58148740A (en) * | 1982-02-27 | 1983-09-03 | Fujikura Ltd | Controlling method for resin temperature at plastic molding machine |
| JPS58185237A (en) * | 1982-04-26 | 1983-10-28 | Sumitomo Heavy Ind Ltd | Detection of temperature pattern of injection molder, etc. |
-
1984
- 1984-04-26 JP JP8464884A patent/JPS60242029A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60242029A (en) | 1985-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |