JPH07156235A - Heat control device for injection molding machine - Google Patents
Heat control device for injection molding machineInfo
- Publication number
- JPH07156235A JPH07156235A JP30632993A JP30632993A JPH07156235A JP H07156235 A JPH07156235 A JP H07156235A JP 30632993 A JP30632993 A JP 30632993A JP 30632993 A JP30632993 A JP 30632993A JP H07156235 A JPH07156235 A JP H07156235A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- zone
- heating
- metering
- heating cylinder
- 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
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は射出成形機の加熱制御装
置に関し、特に、射出成形機に備えられた加熱シリンダ
ーにおける樹脂焼け防止方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating control device for an injection molding machine, and more particularly to a method for preventing resin burning in a heating cylinder provided in the injection molding machine.
【0002】[0002]
【従来の技術】一般に射出成形機では加熱シリンダーに
よって樹脂を溶融(可塑化)した後スクリューを前進駆
動して溶融樹脂を金型内に射出するようにしている。こ
のような射出成形機では加熱シリンダーにおける樹脂溶
融の際、加熱シリンダー全体に亘って加熱温度を精度よ
く制御する必要がある。2. Description of the Related Art Generally, in an injection molding machine, a resin is melted (plasticized) by a heating cylinder and then a screw is driven forward to inject the molten resin into a mold. In such an injection molding machine, when melting the resin in the heating cylinder, it is necessary to accurately control the heating temperature throughout the heating cylinder.
【0003】従来、加熱シリンダーの加熱制御に当たっ
ては加熱シリンダーを複数のゾーンに区分して、各ゾー
ン毎に加熱温度を設定しこれら加熱温度に基づいて複数
のヒータへの通電を制御している。具体的には、各ゾー
ン毎に温度を検出してこの検出温度が設定加熱温度(目
標温度)に達するまでヒータがオンされ、目標温度に達
すると、検出温度に応じてヒータをオンオフ制御してい
る。Conventionally, in heating control of a heating cylinder, the heating cylinder is divided into a plurality of zones, a heating temperature is set for each zone, and energization to a plurality of heaters is controlled based on these heating temperatures. Specifically, the temperature is detected for each zone, the heater is turned on until the detected temperature reaches the set heating temperature (target temperature), and when the target temperature is reached, the heater is turned on / off according to the detected temperature. There is.
【0004】このような加熱制御では、特に、加熱初期
において各ゾーン毎にその特性(昇温能力と放熱量との
バランス)に応じて温度が上昇していく。このため、ス
クリューヘッドの切損防止の観点から加熱シリンダーが
十分に加熱されしかもシリンダー内部に熱が十分伝わっ
て樹脂が完全に溶融するまでスクリュー駆動を行わない
ようにしている。In such heating control, in particular, in the initial stage of heating, the temperature rises in each zone according to its characteristics (balance between temperature rising ability and heat radiation amount). Therefore, from the viewpoint of preventing the screw head from being damaged, the screw is not driven until the heating cylinder is sufficiently heated and the heat is sufficiently transmitted to the inside of the cylinder to completely melt the resin.
【0005】[0005]
【発明が解決しようとする課題】ところで、加熱シリン
ダーの加熱制御を行う際には、一般に、ヒーターの発熱
線の密度を局部的に変更する等して局部的な温度変動を
極力少なくしているが、スクリューヘッドの前方に供給
された樹脂が十分に溶融されスクリューヘッドがロック
されないだけの加熱時間を確保すると、加熱シリンダー
に備えられた水冷シリンダー部(冷却部)に密接する樹
脂供給部の加熱時間が長くなって、この結果、放熱量が
少ない圧縮部側が過度に加熱されてしまい、樹脂に所謂
焼けが発生してしまうという問題点がある。By the way, in controlling the heating of the heating cylinder, generally, the density of the heating wire of the heater is locally changed to locally reduce the temperature fluctuation. However, if the heating time is secured so that the resin supplied in front of the screw head is sufficiently melted and the screw head is not locked, the heating of the resin supply part that is in close contact with the water cooling cylinder part (cooling part) equipped in the heating cylinder As a result, the time becomes long, and as a result, there is a problem that the compression portion side, which has a small amount of heat radiation, is excessively heated, and so-called burning occurs in the resin.
【0006】本発明の目的はスクリューヘッドに切損が
発生することなくしかも樹脂に焼けが生じることのない
射出成形機の加熱制御装置を提供することにある。An object of the present invention is to provide a heating control device for an injection molding machine in which the screw head is not damaged and the resin is not burnt.
【0007】[0007]
【課題を解決するための手段】本発明によれば、原料樹
脂が供給されるホッパーと、該ホッパーに連結され前記
原料樹脂を溶融して溶融樹脂として蓄える加熱シリンダ
ーと、該加熱シリンダー内に回転可能にしかも前進及び
後退可能に配置されたスクリューとを有する射出成形機
に用いられ、前記加熱シリンダーはその前端部から順に
計量部ゾーン、圧縮部ゾーン、及び供給部ゾーンに区分
されており、さらに、前記計量部ゾーン、前記圧縮部ゾ
ーン、及び前記供給部ゾーン毎に前記加熱シリンダーを
加熱するヒーター手段と、前記計量部ゾーン、前記圧縮
部ゾーン、及び前記供給部ゾーン毎に前記加熱シリンダ
ーの温度をそれぞれ計量部検出温度、圧縮部検出温度、
及び供給部検出温度として検出する温度検出手段と、前
記計量部検出温度、前記圧縮部検出温度、及び前記供給
部検出温度と前記計量部ゾーン、前記圧縮部ゾーン、及
び前記供給部ゾーン毎に設定された設定温度に基づいて
前記ヒーター手段を制御する制御手段とを有し、前記制
御手段には前記計量部ゾーン、前記圧縮部ゾーン、及び
前記供給部ゾーンに対応して前記設定温度がそれぞれ計
量部設定温度、圧縮部設定温度、および供給部設定温度
として設定されており、前記制御手段は前記計量部検出
温度が前記計量部設定温度に達すると、前記供給部ゾー
ンの設定温度を前記供給部設定温度から予め定められた
温度だけ低い予備供給部設定温度に設定し、予め定めら
れた時間経過後前記供給部ゾーンの設定温度を再び前記
供給部設定温度に設定し、前記予め定められた時間経過
後前記スクリューが回転駆動されるようにしたことを特
徴とする射出成形機の加熱制御装置が得られる。According to the present invention, a hopper to which a raw material resin is supplied, a heating cylinder connected to the hopper for melting the raw material resin and storing the molten resin as a molten resin, and a rotating cylinder in the heating cylinder. It is used in an injection molding machine having a screw arranged so that it can move forward and backward, and the heating cylinder is divided into a metering zone zone, a compression zone, and a feeding zone in order from the front end thereof. Heater means for heating the heating cylinder for each of the measuring section zone, the compression section zone, and the supply section zone, and the temperature of the heating cylinder for each of the measuring section zone, the compression section zone, and the supply section zone The measuring part detection temperature, the compression part detection temperature,
And temperature detection means for detecting as a supply portion detection temperature, the measurement portion detection temperature, the compression portion detection temperature, and the supply portion detection temperature and the measurement portion zone, the compression portion zone, and set for each supply portion zone And a control means for controlling the heater means based on the set temperature, and the control means measures the set temperature corresponding to the metering zone, the compression zone, and the supply zone, respectively. The temperature is set as a section setting temperature, a compression section setting temperature, and a supply section setting temperature. When the measuring section detection temperature reaches the measuring section setting temperature, the control means sets the setting temperature of the supplying section zone to the supplying section. It is set to a temperature lower than the preset temperature by a preset temperature, and the preset temperature in the feed zone is set to the preset temperature again after a preset time. Constant, and the heating control device for an injection molding machine is preset time has elapsed after the screw is characterized in that so as to be rotated is obtained.
【0008】[0008]
【作用】本発明では計量部ゾーンの検出温度が設定温度
に達すると供給部ゾーンの設定温度を予め定められた温
度だけ低く設定するようにしたから、予め定められた時
間(切損防止時間)経過後スクリューを回転駆動するよ
うにした際、供給部ゾーンにおいて樹脂に焼けが生じる
ことがない。In the present invention, when the detected temperature of the metering zone reaches the set temperature, the set temperature of the supply zone is set lower by a predetermined temperature. Therefore, the predetermined time (cutting prevention time) When the screw is driven to rotate after a lapse of time, the resin does not burn in the supply zone.
【0009】[0009]
【実施例】以下本発明について実施例によって説明す
る。EXAMPLES The present invention will be described below with reference to examples.
【0010】図1を参照して、図示の加熱シリンダー装
置は加熱シリンダー11を備えており、この加熱シリン
ダーの後端は水冷シリンダー12に取り付けられてい
る。また、加熱シリンダー11の前端にはノズル部11
aが形成されている。水冷シリンダー12にはホッパー
13が備えられ、このホッパー13から加熱シリンダー
11内に樹脂が供給される。Referring to FIG. 1, the illustrated heating cylinder device includes a heating cylinder 11, and the rear end of the heating cylinder is attached to a water cooling cylinder 12. Further, the nozzle portion 11 is provided at the front end of the heating cylinder 11.
a is formed. The water cooling cylinder 12 is provided with a hopper 13, and the resin is supplied into the heating cylinder 11 from the hopper 13.
【0011】加熱シリンダー内には回転可能にかつ進退
自在にスクリュー14が配置されており、このスクリュ
ー14はスクリュー本体部14aとこのスクリュー本体
部14aの前端にねじ部141によって取り付けられた
スクリューヘッド14bとを備えている。図示のよう
に、スクリュー本体部14aの外周面には所定の間隔を
おいて溝部14cが形成され、各溝部14c間の外周面
は加熱シリンダー11の内周面に当接している(この部
分はフライト部14dと呼ばれる)。A screw 14 is disposed in the heating cylinder so as to be rotatable and movable back and forth. The screw 14 is a screw body portion 14a and a screw head 14b attached to the front end of the screw body portion 14a by a screw portion 141. It has and. As shown in the figure, groove portions 14c are formed on the outer peripheral surface of the screw body portion 14a at a predetermined interval, and the outer peripheral surface between the groove portions 14c is in contact with the inner peripheral surface of the heating cylinder 11 (this portion is Called flight part 14d).
【0012】加熱シリンダー11は複数の加熱ゾーンに
区分されており、図示の例では、加熱シリンダー11の
前端から順にノズル部ゾーン15、計量部ゾーン16、
圧縮部ゾーン17、供給部ゾーン18に区分されてい
る。各加熱ゾーンに対応して加熱シリンダー11の外周
面にヒーター19が配設されており、これらヒーター1
9への通電を制御することによって加熱シリンダー11
の制御が行われる。図示の例では、計量部ゾーン16に
は1台のヒーター19が配置され、圧縮部ゾーン17に
は1台のヒーター19が配置されている。そして、供給
部ゾーン18には2台のヒーター19が配置されてい
る。なお、ノズル部ゾーン15にもヒーター20が取り
付けられている。The heating cylinder 11 is divided into a plurality of heating zones. In the example shown in the figure, the nozzle zone 15, the metering zone 16 and the measuring zone 16 are arranged in this order from the front end of the heating cylinder 11.
It is divided into a compression zone 17 and a supply zone 18. A heater 19 is provided on the outer peripheral surface of the heating cylinder 11 corresponding to each heating zone.
The heating cylinder 11 is controlled by controlling the energization of 9
Is controlled. In the illustrated example, one heater 19 is arranged in the metering zone 16 and one heater 19 is arranged in the compression zone 17. Further, two heaters 19 are arranged in the supply zone 18. The heater 20 is also attached to the nozzle zone 15.
【0013】各加熱ゾーンに対応して加熱シリンダー1
1には熱電対21が取り付けられ、さらに、図示の例で
はノズル部11aの後端にも熱電対22が取り付けられ
ている。A heating cylinder 1 corresponding to each heating zone
1, a thermocouple 21 is attached, and in the illustrated example, a thermocouple 22 is also attached to the rear end of the nozzle portion 11a.
【0014】加熱シリンダー11内に樹脂を供給する際
には、つまり、計量工程においては、まず、ヒータ19
及び20に通電され、加熱シリンダーが加熱される。加
熱シリンダー11の温度は熱電対19及び20によって
検出されており、それぞれノズル部検出温度、計量部検
出温度、圧縮部検出温度、及び供給部検出温度として温
度調節装置(図示せず)に与えられる。そして、この温
度調節装置にはノズル部ゾーン15、計量部ゾーン1
6、圧縮部ゾーン17、及び供給部ゾーン18毎に設定
温度が設定されており、ここではそれぞれノズル部設定
温度、計量部設定温度、圧縮部設定温度、及び供給部設
定温度と呼ぶことにする。When supplying the resin into the heating cylinder 11, that is, in the measuring step, first, the heater 19 is used.
And 20 are energized to heat the heating cylinder. The temperature of the heating cylinder 11 is detected by thermocouples 19 and 20, and is supplied to a temperature controller (not shown) as a nozzle detection temperature, a metering detection temperature, a compression detection temperature, and a supply detection temperature, respectively. . The temperature adjusting device includes a nozzle zone 15 and a measuring zone 1
6, the set temperature is set for each of the compression zone 17, and the supply zone 18. Here, they are referred to as nozzle set temperature, metering set temperature, compression set temperature, and supply set temperature, respectively. .
【0015】起動初期において、つまり、計量工程初期
において、温度調節装置では計量部設定温度と計量部検
出温度とを比較して、計量部検出温度が計量部設定温度
に達すると、予め定められた時間(加熱シリンダー内部
にまで熱が伝わるのに十分な時間(以下切損防止時間と
呼ぶ)、例えば、15分間)経過後、スクリュー14が
モーター(図示せず)等により実線矢印で示す方向に回
転駆動可能な状態となる。In the initial stage of start-up, that is, in the initial stage of the weighing process, the temperature controller compares the set temperature of the measuring unit with the detected temperature of the measuring unit, and when the detected temperature of the measuring unit reaches the set temperature of the measuring unit, it is determined in advance. After a lapse of time (a time sufficient to transfer heat to the inside of the heating cylinder (hereinafter, referred to as cut-off prevention time), for example, 15 minutes), the screw 14 is moved in a direction indicated by a solid arrow by a motor (not shown) or the like. It is ready to rotate.
【0016】スクリュー14の回転駆動によってホッパ
ー13から加熱シリンダー11に供給された樹脂は供給
部ゾーン18を経て圧縮部ゾーン17に達する。圧縮部
ゾーン17ではスクリュー本体部14aに形成された溝
部14cは前方に向かうにつれて図示のようにその深さ
が徐々に浅くなっており、これによって、圧縮部ゾーン
17で樹脂が溶融され計量部ゾーン16に溶融樹脂とし
て蓄積される。そして、スクリュー14は溶融樹脂圧力
によって徐々に後退する。なお、樹脂が十分に溶融して
いない状態でスクリュー14が回転駆動されると、ねじ
部141が切損する関係上上記の切損防止時間が経過す
るまでスクリュー14は回転できない状態となってい
る。以後、温度調節装置は計量部設定温度と計量部検出
温度とに基づいて計量部ゾーン16に備えられたヒータ
19をオンオフ制御する。The resin supplied from the hopper 13 to the heating cylinder 11 by the rotational driving of the screw 14 reaches the compression section zone 17 through the supply section zone 18. In the compression portion zone 17, the groove portion 14c formed in the screw main body portion 14a gradually becomes shallower in depth as shown in the figure, whereby the resin is melted in the compression portion zone 17 and the measurement portion zone is formed. It is accumulated in 16 as a molten resin. Then, the screw 14 is gradually retracted by the molten resin pressure. When the screw 14 is rotationally driven in a state where the resin is not sufficiently melted, the screw 14 cannot be rotated until the above-mentioned breakage prevention time elapses due to the breakage of the screw portion 141. After that, the temperature control device controls ON / OFF of the heater 19 provided in the metering zone 16 based on the metering section set temperature and the metering section detected temperature.
【0017】ところで、前述のように供給部ゾーン18
が水冷シリンダー12に接続されている点及びナイロン
のように溶融し始めると熱を奪う樹脂がある点を考慮し
て、供給部ゾーン18に備えられたヒータ19は単位面
積当りの容量(発熱量)を大きくしてある。この結果、
供給部ゾーン18において供給部設定温度と供給部検出
温度とに基づいてヒータを単にオンオフ制御すると、供
給部ゾーン18の前側(つまり、水冷シリンダー12か
ら離れた部分)における温度が供給部設定温度よりも高
くなってしまう。しかも、前述のように、切損防止時間
が経過するまで、スクリュー14の回転駆動は停止され
ているので、ホッパー13からの樹脂が供給部ゾーン1
8の前側において加熱シリンダー11の内壁面(高温部
分)に付着した状態となり、ここで樹脂焼けの核が発生
する。この核はスクリュー14が回転駆動された際大部
分がかき落とされるけれどもその一部が被膜状となって
内壁面に残留する。By the way, as described above, the supply zone 18
Is connected to the water-cooled cylinder 12 and there is a resin such as nylon that absorbs heat when it begins to melt. ) Is increased. As a result,
If the heater is simply turned on and off in the supply zone 18 based on the supply set temperature and the supply detected temperature, the temperature at the front side of the supply zone 18 (that is, the portion away from the water cooling cylinder 12) is higher than the supply set temperature. Will also be high. Moreover, as described above, the rotational drive of the screw 14 is stopped until the cut-off prevention time elapses, so that the resin from the hopper 13 is supplied to the supply zone 1.
At the front side of the heating cylinder 11, it becomes attached to the inner wall surface (high-temperature portion) of the heating cylinder 11, where a resin burning nucleus is generated. Although most of the nuclei are scraped off when the screw 14 is driven to rotate, some of the nuclei remain in the form of a film on the inner wall surface.
【0018】一般に、樹脂が10分程度で焼け始める温
度に対して20乃至50℃程度低い温度では長時間樹脂
が加熱状態にあっても焼けが生じることがない。そこ
で、本発明ではノズル部検出温度及び計量部検出温度が
それぞれノズル部設定温度及び計量部設定温度に達した
後切損防止時間が経過するまでの間、圧縮部設定温度及
び供給部設定温度を予め定められた温度(例えば、30
℃)低い温度に設定する(以下この設定温度を予備圧縮
部設定温度及び予備供給部設定温度と呼ぶ)。つまり、
温度調節装置には圧縮部設定温度及び供給部設定温度に
加えて予備圧縮部設定温度及び予備供給部設定温度が設
定され、起動後、ノズル部検出温度及び計量部検出温度
がそれぞれノズル部設定温度及び計量部設定温度に達す
ると、温度調節装置は予備圧縮部設定温度及び予備供給
部設定温度に設定温度を切り替えて、圧縮部ゾーン17
及び供給部ゾーン18の温度制御を行う。そして、切損
防止時間が経過すると、温度調節装置は圧縮部設定温度
及び供給部設定温度を再び設定温度として温度制御を実
行する。このようにして、加熱シリンダーを加熱制御す
ることによって樹脂焼けを防止することができる。Generally, at a temperature lower by about 20 to 50 ° C. than the temperature at which the resin starts to burn in about 10 minutes, burning does not occur even if the resin is heated for a long time. Therefore, in the present invention, the compression part set temperature and the supply part set temperature are set until the cut-off prevention time elapses after the nozzle part detected temperature and the metering part detected temperature reach the nozzle part set temperature and the metering part set temperature, respectively. Predetermined temperature (for example, 30
(° C.) set to a low temperature (hereinafter, these set temperatures are referred to as the pre-compression section set temperature and the pre-supply section set temperature). That is,
In the temperature control device, in addition to the compression section setting temperature and the supply section setting temperature, the preliminary compression section setting temperature and the preliminary supply section setting temperature are set, and after starting, the nozzle section detection temperature and the metering section detection temperature are respectively set to the nozzle section set temperature. And when the temperature reaches the metering section set temperature, the temperature controller switches the set temperature to the pre-compression section set temperature and the pre-supply section set temperature, and the compression section zone 17
Also, the temperature of the supply zone 18 is controlled. Then, after the cut-off prevention time has elapsed, the temperature control device sets the compression unit set temperature and the supply unit set temperature again as set temperatures and executes temperature control. In this way, by controlling the heating of the heating cylinder, resin burning can be prevented.
【0019】加えて、温度調節装置では圧縮部検出温度
及び供給部検出温度がそれぞれ圧縮部設定温度及び供給
部設定温度に達した後、予め設定された時間(例えば、
5分間)経過してもスクリュー14が回転駆動されない
と、アラームを出すとともに再び予備圧縮部設定温度及
び予備供給部設定温度に設定温度を切り替えて、圧縮部
ゾーン17及び供給部ゾーン18の温度制御を行う。こ
れによって、オペレータに異常を通知するとともに樹脂
焼けを最小限度に抑える。In addition, in the temperature control device, after the compression section detection temperature and the supply section detection temperature reach the compression section set temperature and the supply section set temperature, respectively, a preset time (for example,
If the screw 14 is not rotationally driven even after 5 minutes), an alarm is generated and the preset temperature is switched to the preset compression section set temperature and the preliminary supply section set temperature again to control the temperature of the compression section zone 17 and the supply section zone 18. I do. As a result, the operator is notified of the abnormality and the resin burn is suppressed to the minimum.
【0020】なお、計量工程終了後は、公知のようにス
クリュー14を前進駆動して、加熱シリンダー11から
ノズル部11aを介して金型(図示せず)内に溶融樹脂
を射出して射出成形が実行される。After the end of the measuring step, the screw 14 is driven forward as is known, and the molten resin is injected from the heating cylinder 11 into the mold (not shown) through the nozzle portion 11a to perform injection molding. Is executed.
【0021】上述の実施例ではノズル部検出温度及び計
量部検出温度がそれぞれノズル部設定温度及び計量部設
定温度になると圧縮部ゾーンの設定温度及び供給部ゾー
ンの設定温度を予め設定された温度だけ低く設定するよ
うにしたが、計量部検出温度が計量部設定温度になると
圧縮部ゾーンの設定温度及び供給部ゾーンの設定温度を
予め設定された温度だけ低く設定するようにしてもよ
く、また、供給部ゾーンのみの設定温度を予め設定され
た温度だけ低く設定するようにしてもよい。いずれにし
ても、計量部検出温度が計量部設定温度になると供給部
ゾーンの設定温度を予め設定された温度だけ低く設定す
るようにすれば、同様に樹脂焼けを防止することができ
る。In the above-described embodiment, when the nozzle detection temperature and the metering section detection temperature reach the nozzle section setting temperature and the metering section setting temperature, respectively, the set temperature of the compression section zone and the set temperature of the supply section zone are set to the preset temperatures. Although it is set to be low, the set temperature of the compression zone and the set temperature of the supply zone may be set to be lower by a preset temperature when the detected temperature of the measurement section reaches the set temperature of the measurement section. The set temperature only in the supply zone may be set lower by a preset temperature. In any case, if the temperature detected by the measuring section reaches the setting temperature of the measuring section, the setting temperature of the supply section zone is set lower by a preset temperature, so that the resin burn can be similarly prevented.
【0022】さらに、計量部ゾーン(ノズル部ゾーンを
含む)における加熱を他のゾーンよりも所定の時間早く
開始するようにしても同様にして樹脂焼けを防止するこ
とができ、その他、計量部ゾーン(ノズル部ゾーンを含
む)を除く他のゾーンの加熱を所定時間中断するように
してもよい。また、計量部ゾーン(ノズル部ゾーンを含
む)を除く他のゾーンにおいて、ヒーターに供給する電
力の実効値を所定時間の間所定量だけ低減させるように
してもよい。Further, even if the heating in the measuring zone (including the nozzle zone) is started earlier than the other zones by a predetermined time, the resin burning can be prevented in the same manner. The heating of other zones (including the nozzle zone) may be interrupted for a predetermined time. Further, in the zones other than the metering zone (including the nozzle zone), the effective value of the electric power supplied to the heater may be reduced by a predetermined amount for a predetermined time.
【0023】[0023]
【発明の効果】以上説明したように、本発明では計量部
ゾーンの検出温度が設定温度に達すると供給部ゾーンの
設定温度を予め定められた温度だけ低く設定するように
したから、つまり、計量部ゾーン以外のゾーンの加熱量
を低く設定したから、切損防止時間経過後スクリューを
回転駆動するようにした際、スクリューヘッドに切損が
発生することなくしかも供給部ゾーンにおいて樹脂に焼
けが生じないという効果がある。As described above, according to the present invention, when the detected temperature of the measuring section zone reaches the set temperature, the set temperature of the supply section zone is set lower by a predetermined temperature. Since the heating amount of the zones other than the partial zone is set low, when the screw is driven to rotate after the breakage prevention time has elapsed, the resin does not burn in the screw head and the resin burns in the feeding zone. There is an effect that there is no.
【図1】本発明のよる射出成形機の加熱制御装置の一実
施例を説明するための図である。FIG. 1 is a diagram for explaining an embodiment of a heating control device for an injection molding machine according to the present invention.
11 加熱シリンダー 12 水冷シリンダー 13 ホッパー 14 スクリュー 15 ノズル部ゾーン 16 計量部ゾーン 17 圧縮部ゾーン 18 供給部ゾーン 19,20 ヒータ 21 熱電対 11 Heating Cylinder 12 Water Cooling Cylinder 13 Hopper 14 Screw 15 Nozzle Zone 16 Measuring Zone 17 Compression Zone 18 Supply Zone 19, 20 Heater 21 Thermocouple
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡村 裕幸 千葉県千葉市稲毛区長沼原町731番地1 住友重機械工業株式会社千葉製造所内 (72)発明者 数面 博義 千葉県千葉市稲毛区長沼原町731番地1 住友重機械工業株式会社千葉製造所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Okamura, Inventor 731-1 Naganumahara-cho, Inage-ku, Chiba-shi, Chiba Sumitomo Heavy Industries, Ltd. Chiba Plant (72) Hiroyoshi Naganuma-cho, Inage-ku, Chiba, Chiba Prefecture 731 Address 1 Sumitomo Heavy Industries, Ltd. Chiba Works
Claims (7)
る加熱シリンダーと、該加熱シリンダー内に回転可能に
しかも前進及び後退可能に配置されたスクリューとを有
する射出成形機に用いられ、前記加熱シリンダーはその
前端部から順に計量部ゾーン、圧縮部ゾーン、及び供給
部ゾーンの3つのゾーンに区分されており、さらに、前
記3つのゾーン毎に前記加熱シリンダーを加熱するヒー
ター手段と、前記3つのゾーン毎に前記加熱シリンダー
の温度をそれぞれ計量部検出温度、圧縮部検出温度、及
び供給部検出温度として検出する温度検出手段と、前記
計量部検出温度、前記圧縮部検出温度、及び前記供給部
検出温度と前記3つのゾーン毎に設定された設定温度に
基づいて前記ヒーター手段を制御する制御手段とを有
し、前記制御手段には前記3つのゾーンのそれぞれに対
応して前記設定温度がそれぞれ計量部設定温度、圧縮部
設定温度、および供給部設定温度として設定されてお
り、前記制御手段は前記計量部検出温度が前記計量部設
定温度に達すると、前記供給部ゾーンの設定温度を前記
供給部設定温度から予め定められた温度だけ低い予備供
給部設定温度に設定し、予め定められた時間経過後前記
供給部ゾーンの設定温度を再び前記供給部設定温度に設
定し、前記予め定められた時間経過後前記スクリューが
回転駆動されるようにしたことを特徴とする射出成形機
の加熱制御装置。1. A heating cylinder, which is used in an injection molding machine having a heating cylinder that melts a raw material resin and stores it as a molten resin, and a screw that is rotatably arranged in the heating cylinder so that the heating cylinder can move forward and backward. Is divided into three zones, that is, a metering zone, a compression zone, and a feeding zone, in that order from the front end thereof, and further, heater means for heating the heating cylinder in each of the three zones, and the three zones. Temperature detecting means for detecting the temperature of the heating cylinder as the metering part detection temperature, the compression part detection temperature, and the supply part detection temperature respectively, and the metering part detection temperature, the compression part detection temperature, and the supply part detection temperature. And a control means for controlling the heater means based on the set temperatures set for each of the three zones, and the control means includes The set temperature is set as the metering section set temperature, the compression section set temperature, and the supply section set temperature corresponding to each of the three zones, and the control unit sets the metering section detection temperature to the metering section setting temperature. When the temperature is reached, the set temperature of the supply zone is set to a preliminary supply set temperature which is lower than the supply set temperature by a predetermined temperature, and the set temperature of the supply zone is set after the elapse of a predetermined time. A heating control device for an injection molding machine, wherein the temperature is set again at the supply part set temperature, and the screw is rotationally driven after the lapse of the predetermined time.
制御装置において、前記予め定められた時間経過後所定
の時間が経過しても前記スクリューが回転駆動されない
と、前記制御手段はアラームを送出し前記供給部ゾーン
の設定温度を前記予備供給部設定温度に設定するように
したことを特徴とする射出成形機の加熱制御装置。2. The heating control device for an injection molding machine according to claim 1, wherein if the screw is not rotationally driven even after a lapse of a predetermined time after the lapse of the predetermined time, the control means outputs an alarm. The heating control device for the injection molding machine is characterized in that the set temperature of the supply zone is set to the set temperature of the preliminary supply section.
制御装置において、前記制御手段は、前記計量部検出温
度が前記計量部設定温度に達すると、前記圧縮部ゾーン
の設定温度を前記圧縮部設定温度から予め定められた温
度だけ低い予備圧縮部設定温度に設定し、前記予め定め
られた時間経過後前記圧縮部ゾーンの設定温度を再び前
記圧縮部設定温度に設定するようにしたことを特徴とす
る射出成形機の加熱制御装置。3. The heating control device for an injection molding machine according to claim 1, wherein the control means sets the set temperature of the compression section zone to the set temperature when the measured temperature of the measuring section reaches the set temperature of the measuring section. The pre-compression section set temperature lower than the compression section set temperature by a predetermined temperature is set, and the set temperature of the compression section zone is set again to the compression section set temperature after the lapse of the predetermined time. A heating control device for an injection molding machine.
制御装置において、前記予め定められた時間経過後所定
の時間が経過しても前記スクリューが回転駆動されない
と、前記制御手段はアラームを送出し前記供給部ゾーン
の設定温度を前記予備供給部設定温度に設定するととも
に前記圧縮部ゾーンの設定温度を前記予備圧縮部設定温
度に設定するようにしたことを特徴とする射出成形機の
加熱制御装置。4. The heating control device for an injection molding machine according to claim 3, wherein the control means outputs an alarm if the screw is not rotationally driven even after a lapse of a predetermined time after the lapse of the predetermined time. Of the injection molding machine, wherein the set temperature of the supply section zone is set to the preliminary supply section set temperature and the set temperature of the compression section zone is set to the preliminary compression section set temperature. Heating control device.
る加熱シリンダーと、該加熱シリンダー内に回転可能に
しかも前進及び後退可能に配置されたスクリューとを有
する射出成形機に用いられ、前記加熱シリンダーはその
前端部から順に計量部ゾーン、圧縮部ゾーン、及び供給
部ゾーンに区分されており、さらに、前記3つのゾーン
毎に前記加熱シリンダーを加熱するヒーター手段と、前
記3つのゾーン毎に前記加熱シリンダーの温度をそれぞ
れ計量部検出温度、圧縮部検出温度、及び供給部検出温
度として検出する温度検出手段と、前記計量部検出温
度、前記圧縮部検出温度、及び前記供給部検出温度と前
記3つのゾーン毎に設定された設定温度に基づいて前記
ヒーター手段を制御する制御手段とを有し、前記制御手
段は前記ヒーター手段を制御して前記計量部ゾーンにお
ける加熱を他のゾーンよりも予め定められた時間量だけ
早く開始するようにしたことを特徴とする射出成形機の
加熱制御装置。5. A heating cylinder, which is used in an injection molding machine having a heating cylinder that melts a raw material resin and stores it as a molten resin, and a screw that is rotatably arranged in the heating cylinder and that can move forward and backward. Is divided into a metering zone, a compression zone, and a feeding zone from the front end thereof in order, and further, heater means for heating the heating cylinder in each of the three zones, and heating in each of the three zones. Temperature detecting means for detecting the temperature of the cylinder as a metering section detection temperature, a compression section detection temperature, and a supply section detection temperature, respectively, the metering section detection temperature, the compression section detection temperature, and the supply section detection temperature, and the three Control means for controlling the heater means based on the set temperature set for each zone, the control means being the heater means. The heating control device for the injection molding machine is characterized in that the heating in the metering zone is started earlier than the other zones by a predetermined amount of time.
る加熱シリンダーと、該加熱シリンダー内に回転可能に
しかも前進及び後退可能に配置されたスクリューとを有
する射出成形機に用いられ、前記加熱シリンダーはその
前端部から順に計量部ゾーン、圧縮部ゾーン、及び供給
部ゾーンに区分されており、さらに、前記3つのゾーン
毎に前記加熱シリンダーを加熱するヒーター手段と、前
記3つのゾーン毎に前記加熱シリンダーの温度をそれぞ
れ計量部検出温度、圧縮部検出温度、及び供給部検出温
度として検出する温度検出手段と、前記計量部検出温
度、前記圧縮部検出温度、及び前記供給部検出温度と前
記3つのゾーン毎に設定された設定温度に基づいて前記
ヒーター手段を制御する制御手段とを有し、前記制御手
段は、前記ヒータ手段を制御して前記加熱シリンダーの
加熱を開始した後前記計量部ゾーン以外の他のゾーンの
加熱を予め設定された時間中断するようにしたことを特
徴とする射出成形機の加熱制御装置。6. A heating cylinder, which is used in an injection molding machine having a heating cylinder that melts a raw material resin and stores it as a molten resin, and a screw that is rotatably arranged in the heating cylinder so that the heating cylinder can move forward and backward. Is divided into a metering zone, a compression zone, and a feeding zone from the front end thereof in order, and further, heater means for heating the heating cylinder in each of the three zones, and heating in each of the three zones. Temperature detecting means for detecting the temperature of the cylinder as a metering section detection temperature, a compression section detection temperature, and a supply section detection temperature, respectively, the metering section detection temperature, the compression section detection temperature, and the supply section detection temperature, and the three Control means for controlling the heater means based on a set temperature set for each zone, wherein the control means is the heater means. Is controlled to start heating of the heating cylinder, and then heating of zones other than the metering zone is interrupted for a preset time.
る加熱シリンダーと、該加熱シリンダー内に回転可能に
しかも前進及び後退可能に配置されたスクリューとを有
する射出成形機に用いられ、前記加熱シリンダーはその
前端部から順に計量部ゾーン、圧縮部ゾーン、及び供給
部ゾーンに区分されており、さらに、前記3つのゾーン
毎に前記加熱シリンダーを加熱するヒーター手段と、前
記3つのゾーン毎に前記加熱シリンダーの温度をそれぞ
れ計量部検出温度、圧縮部検出温度、及び供給部検出温
度として検出する温度検出手段と、前記計量部検出温
度、前記圧縮部検出温度、及び前記供給部検出温度と前
記3つのゾーン毎に設定された設定温度に基づいて前記
ヒーター手段を制御する制御手段とを有し、前記制御手
段は、前記ヒータ手段を制御して前記加熱シリンダーの
加熱を開始した後前記計量部ゾーン以外の他のゾーンに
おいて前記ヒータ手段に供給する交流電力の実効値を予
め定められた時間所定量だけ低減させるようにしたこと
を特徴とする射出成形機の加熱制御装置。7. A heating cylinder, which is used in an injection molding machine having a heating cylinder that melts a raw material resin and stores it as a molten resin, and a screw that is rotatably arranged in the heating cylinder and can be moved forward and backward. Is divided into a metering zone, a compression zone, and a feeding zone from the front end thereof in order, and further, heater means for heating the heating cylinder in each of the three zones, and heating in each of the three zones. Temperature detecting means for detecting the temperature of the cylinder as a metering section detection temperature, a compression section detection temperature, and a supply section detection temperature, respectively, the metering section detection temperature, the compression section detection temperature, and the supply section detection temperature, and the three Control means for controlling the heater means based on a set temperature set for each zone, wherein the control means is the heater means. After starting the heating of the heating cylinder by controlling the above, the effective value of the AC power supplied to the heater means in a zone other than the metering zone is reduced by a predetermined amount for a predetermined time. A heat control device for injection molding machines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30632993A JP2857971B2 (en) | 1993-12-07 | 1993-12-07 | Heating control device for injection molding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30632993A JP2857971B2 (en) | 1993-12-07 | 1993-12-07 | Heating control device for injection molding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07156235A true JPH07156235A (en) | 1995-06-20 |
JP2857971B2 JP2857971B2 (en) | 1999-02-17 |
Family
ID=17955802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30632993A Expired - Lifetime JP2857971B2 (en) | 1993-12-07 | 1993-12-07 | Heating control device for injection molding machine |
Country Status (1)
Country | Link |
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JP (1) | JP2857971B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007276189A (en) * | 2006-04-04 | 2007-10-25 | Nissei Plastics Ind Co | Temperature control method of injection moulding machine |
DE102010048501A1 (en) * | 2010-10-14 | 2012-04-19 | Kraussmaffei Technologies Gmbh | Method for operating a plasticizing a plastic processing machine |
-
1993
- 1993-12-07 JP JP30632993A patent/JP2857971B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007276189A (en) * | 2006-04-04 | 2007-10-25 | Nissei Plastics Ind Co | Temperature control method of injection moulding machine |
JP4533337B2 (en) * | 2006-04-04 | 2010-09-01 | 日精樹脂工業株式会社 | Temperature control method for injection molding machine |
DE102010048501A1 (en) * | 2010-10-14 | 2012-04-19 | Kraussmaffei Technologies Gmbh | Method for operating a plasticizing a plastic processing machine |
Also Published As
Publication number | Publication date |
---|---|
JP2857971B2 (en) | 1999-02-17 |
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