JPS6323897B2 - - Google Patents
Info
- Publication number
- JPS6323897B2 JPS6323897B2 JP54126785A JP12678579A JPS6323897B2 JP S6323897 B2 JPS6323897 B2 JP S6323897B2 JP 54126785 A JP54126785 A JP 54126785A JP 12678579 A JP12678579 A JP 12678579A JP S6323897 B2 JPS6323897 B2 JP S6323897B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- mold
- cavities
- gradient
- molten resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000465 moulding Methods 0.000 claims description 38
- 229920005989 resin Polymers 0.000 claims description 26
- 239000011347 resin Substances 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 238000001746 injection moulding Methods 0.000 claims description 13
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 238000005429 filling process Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 230000006399 behavior Effects 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、合成樹脂の射出成形方法およびそれ
に使用する射出成形装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin injection molding method and an injection molding apparatus used therein.
射出成形加工のプロセスは、種々の要因が相互
に複雑な関連を有している。このため、射出成形
加工に関する不安定要素を制御し、安定した成形
品を連続的に成形する制御方法が必要とされてい
る。とくに、溶融樹脂の射出工程において、充填
圧力から保持圧力へ切換えるタイミング、溶融樹
脂の金型内圧力などは成形品の最終充填状態を左
右し、成形品質に大きな影響を与える。このた
め、これらの要因を制御する種々の制御方法が提
案されている。 In the injection molding process, various factors have a complicated relationship with each other. Therefore, there is a need for a control method that controls unstable factors related to injection molding processing and continuously molds stable molded products. In particular, in the injection process of molten resin, the timing of switching from filling pressure to holding pressure, the pressure inside the mold of molten resin, etc. affect the final filling state of the molded product and have a large impact on molding quality. For this reason, various control methods have been proposed to control these factors.
例えば、従来、以下に述べる制御方法がある。 For example, conventionally, there is a control method described below.
(1) 金型内の樹脂圧力を押出ピン等を介して圧力
センサーで検出し、その樹脂圧力が設定値に達
したら、その時点で保圧工程に制御を切換える
方法、
(2) 射出シリンダに供給される作動油圧力を検出
し、その作動油圧力が設定値に達したら、その
時点で保圧工程に制御を切換える方法、
(3) 射出時における樹脂圧力による金型パーテイ
ング面の開き量あるいは金型の変位置を検出し
それらの計測値が設定値に達したら、その時点
で保圧工程に制御を切換える方法、
などがある。(1) A method in which the resin pressure in the mold is detected by a pressure sensor via an extrusion pin, etc., and when the resin pressure reaches a set value, the control is switched to the pressure holding process at that point. A method of detecting the supplied hydraulic oil pressure and switching the control to the pressure holding process at that point when the hydraulic oil pressure reaches a set value. There are methods such as detecting the displacement of the mold and switching the control to the pressure holding process at that point when the measured values reach the set values.
これらの方法は、成形金型が１個のキヤビテイ
から構成される場合、あるいは、複数のキヤビテ
イから構成されるが、それらのキヤビテイがほぼ
同等形状である場合には、比較的良好な結果が期
待できる。しかしながら、上記した従来法にあつ
ては、成形金型が肉厚、寸法など、形状が大きく
異なる複数のキヤビテイから構成される、いわゆ
る異種形状同時成形の場合には、個々の成形品に
対する個別管理が不可能である。この結果とし
て、管理、制御している成形品は良品が得られる
にもかかわらず、他の成形品においては、シヨツ
トごとにおけるバラツキを生じたり、バリ、シヨ
ートシヨツトなどの成形不良が発生する場合があ
る。とくに、異種形状同時成形の場合には、個々
のキヤビテイの充填状況が異なるため、１個取り
の成形加工に比較すると、その成形条件の変動許
容範囲は小さくなる。このため、僅かな成形条件
の変動により成形不良の発生する危険性は増大す
る。 These methods can be expected to yield relatively good results when the molding die consists of one cavity, or when it consists of multiple cavities that have approximately the same shape. can. However, in the conventional method described above, in the case of so-called simultaneous molding of different shapes, in which the molding die is composed of multiple cavities with greatly different shapes such as wall thickness and dimensions, individual control of each molded product is required. is not possible. As a result, although the molded products that are managed and controlled are of good quality, other molded products may have variations from shot to shot or molding defects such as burrs and shot shots. . In particular, in the case of simultaneous molding of different shapes, since the filling conditions of individual cavities are different, the allowable range of variation in molding conditions is smaller than in single-cavity molding. Therefore, the risk of molding defects occurring due to slight variations in molding conditions increases.
本発明の目的は、上記した従来技術の欠点をな
くし、複数のキヤビテイを有する成形金型を用い
て複数個の樹脂成形品を同時に成形する射出成形
において、充填工程、保圧工程における各成形品
キヤビテイ相互間の成形状態を安定させ、成形条
件の変動に起因する成形不良、成形欠陥を解消
し、連続的に適正な成形品を得ることができる成
形方法及び装置を提供することにある。 The purpose of the present invention is to eliminate the drawbacks of the above-mentioned prior art, and to improve the quality of each molded product in the filling process and pressure holding process in injection molding, in which multiple resin molded products are simultaneously molded using a mold having multiple cavities. It is an object of the present invention to provide a molding method and apparatus that can stabilize the molding state between cavities, eliminate molding defects and molding defects caused by fluctuations in molding conditions, and continuously obtain proper molded products.
本発明は、この目的を達成するために、成形金
型の各キヤビテイ毎に溶融樹脂用の圧力センサー
を設置し、これらセンサーにより各成形品毎の成
形状態を把握し、その情報をもとに、電気油圧制
御弁および金型温度調整弁により各成形品キヤビ
テイの成形条件を個別に制御するようにしたもの
である。 In order to achieve this objective, the present invention installs a pressure sensor for molten resin in each cavity of a molding die, uses these sensors to grasp the molding condition of each molded product, and based on that information, , the molding conditions of each molded product cavity are individually controlled by an electro-hydraulic control valve and a mold temperature control valve.
本発明者らは、成形品形状、成形品材料及び射
出条件を種々に変化させて成形金型内における溶
融樹脂の変動挙動を観察し、成形状態と成形品品
質との相関性を詳細に検討した。その結果、成形
品品質に影響を及ぼす成形状態の因子は、成形サ
イクル毎に変動する溶融樹脂の充填速度、充填圧
力等の応答速度の早い運動エネルギーに関連し
た、いわゆる「動的要因」と、数サイクルにわた
り徐々に変動する溶融樹脂温度あるいは金型温度
等の時定数の大きい熱エネルギーに関連したいわ
ゆる「静的要因」とからなることを究明した。 The present inventors observed the fluctuating behavior of the molten resin in the mold by varying the molded product shape, molded product material, and injection conditions, and examined in detail the correlation between molding conditions and molded product quality. did. As a result, the molding state factors that affect molded product quality include so-called "dynamic factors" related to kinetic energy with a fast response speed, such as the filling speed of molten resin and filling pressure, which vary with each molding cycle. We have determined that this is due to so-called "static factors" related to thermal energy with a large time constant, such as the molten resin temperature or mold temperature, which gradually fluctuates over several cycles.
本発明者らは、これらの現象に着眼し、成形サ
イクル毎に射出シリンダに供給される作動油の流
量及び圧力を調整することにより、動的要因を制
御すると共に、数サイクルにわたる成形状態の観
測結果を基に、成形金型に供給される熱媒体の流
量を調整することにより、静的要因を管理するこ
とが可能な方法と装置を考案した。 Focusing on these phenomena, the present inventors controlled the dynamic factors by adjusting the flow rate and pressure of hydraulic oil supplied to the injection cylinder for each molding cycle, and also observed the molding state over several cycles. Based on the results, we devised a method and device that can manage static factors by adjusting the flow rate of the heat medium supplied to the mold.
以下、本発明による射出成形の制御方法及びそ
の装置を図面に基づいて詳述する。 EMBODIMENT OF THE INVENTION Hereinafter, the injection molding control method and its apparatus according to the present invention will be explained in detail based on the drawings.
第１図は本発明の制御方法を実施する装置の一
実施例を示す構成図である。 FIG. 1 is a block diagram showing an embodiment of an apparatus for carrying out the control method of the present invention.
同図において、１は成形金型、２a〜２cはキヤ
ビテイ３a〜３cを構成している割型である。割型
のブロツク内には、キヤビテイ３a〜３c近傍に型
を加熱するための熱媒体を流通させる導管が設け
てあり、金型温度は、この導管を流動する熱媒体
との熱交換により制御することができる。４は溶
融樹脂射出部で、これは射出スクリユー５、射出
シリンダ６及びこれに作動油を供給する作動油圧
力源７とから構成してある。８は温度調節機構付
熱媒体槽であり、温度制御のために成形金型１に
供給される熱媒体を加熱するための熱源と冷却す
るための冷却機及び温度設定された熱媒体を圧送
するためのポンプから構成されている。温度設定
された熱媒体は、圧送パイプ９、金型温度調節弁
（熱媒体流量調節弁）１０a〜１０cを経由して、
各キヤビテイ３a〜３cを構成する割型２a〜２cに
供給され、金型内の熱交換の後に戻りパイプ１１
を介して熱媒体槽８へ回収される。 In the figure, 1 is a molding die, and 2 a to 2 c are split molds forming cavities 3 a to 3 c . Inside the block of the split mold, there is a conduit through which a heat medium for heating the mold flows near the cavities 3a to 3c , and the mold temperature is controlled by heat exchange with the heat medium flowing through this conduit. can be controlled. Reference numeral 4 denotes a molten resin injection section, which is composed of an injection screw 5, an injection cylinder 6, and a hydraulic oil pressure source 7 for supplying hydraulic oil thereto. 8 is a heat medium tank with a temperature control mechanism, which pumps a heat source for heating the heat medium supplied to the molding die 1 for temperature control, a cooler for cooling the heat medium, and a heat medium having a set temperature. It consists of a pump for. The temperature-set heat medium is passed through the pressure pipe 9 and the mold temperature control valves (heat medium flow rate control valves) 10 a to 10 c .
The pipe 11 is supplied to the split molds 2 a to 2 c forming each cavity 3 a to 3 c , and returns after heat exchange within the mold.
It is recovered to the heat medium tank 8 via.
本発明の制御装置は、その機能により検出部、
演算部及び制御部に分けることができる。検出部
はキヤビテイ３a〜３c内における溶融樹脂圧力を
型内圧力伝達ピン１２a〜１２cを介して検出する
複数の型内圧力センサー１３a〜１３c及び検出さ
れた圧力信号を増幅する複数の型内圧力変換器１
４a〜１４cから構成されている。また、演算部は
型内圧力パターンの状態を規定するため充填圧力
勾配設定器１９、保持圧力勾配設定器２０、射出
速度パターンを規定するための速度パターン設定
器１５及び検出部からの入力情報を基に射出部４
あるいは金型温度調整弁１０a〜１０cに対する制
御信号を出力するコントローラ１６から構成して
ある。さらに、制御部は、これらの信号を増幅す
るパワー増幅器１７a〜１７d、制御信号を作動油
の状態量に変換する電気油圧制御弁１８及び制御
信号をキヤビテイ３a〜３cを構成している割型２
ａ〜２cに供給される熱媒体の流量に変換し、金型
温度を調整する金型温度調整弁１０a〜１０cから
構成されている。 The control device of the present invention has a detection section,
It can be divided into a calculation section and a control section. The detection unit includes a plurality of in-mold pressure sensors 13 a to 13 c that detect the molten resin pressure in the cavities 3 a to 3 c via in-mold pressure transmission pins 12 a to 12 c , and amplifies the detected pressure signals. Multiple mold pressure transducers 1
It consists of 4a to 14c . The calculation section also receives input information from the filling pressure gradient setter 19, the holding pressure gradient setter 20, the speed pattern setter 15 for defining the injection speed pattern, and the detection section in order to define the state of the in-mold pressure pattern. Based on the injection part 4
Alternatively, it may include a controller 16 that outputs control signals for the mold temperature regulating valves 10a to 10c . Further, the control section includes power amplifiers 17 a to 17 d that amplify these signals, an electro-hydraulic control valve 18 that converts the control signals to state quantities of hydraulic oil, and cavities 3 a to 3 c that convert the control signals. split mold 2
It is composed of mold temperature regulating valves 10 a to 10 c that convert the flow rate of the heat medium supplied to the heat mediums a to 2 c and adjust the mold temperature.
以上のように構成した制御装置における動作は
以下の通りである。すなわち、まず、所定温度に
調整された熱媒体槽８から割型２a〜２cに供給す
る熱媒体の流量を金型温度調整弁１０a〜１０cに
より調整して、キヤビテイ３a〜３cを構成する金
型温度を所定温度に設定する。ついで、射出開始
信号により、コントローラ１６は速度パターン設
定器１５の情報に基づき、射出シリンダ６に供給
される作動油流量を調整し、射出スクリユウ５の
前進速度パターンを制御する。これに伴ない、溶
融樹脂は個々のキヤビテイ３a〜３cへ充填され
る。コントローラ１６は、これらの充填状況を圧
力伝達ピン１２a〜１２c、型内圧力変換器１４a
〜１４bを介して常に監視している。そして、成
形状態が速度制御完了の条件を満足した時点から
充填圧力制御を実施する。すなわち、制御目標に
設定した充填圧力上昇勾配をトレースするよう
に、射出シリンダ６に供給される作動油の圧力お
よび流量を調整、制御する。さらに、型内圧力が
充填工程完了の条件を満足した時点から保圧工程
制御を実施する。すなわち、主制御目標に設定し
たキヤビテイの型内圧力の変動挙動が設定した保
持圧力降下勾配をトレースするように射出シリン
ダ６に供給される作動油の圧力および流量を調
整、制御する。 The operation of the control device configured as described above is as follows. That is, first, the flow rate of the heat medium supplied to the split molds 2 a to 2 c from the heat medium tank 8 adjusted to a predetermined temperature is adjusted by the mold temperature adjustment valves 10 a to 10 c , and Set the mold temperature constituting c to a predetermined temperature. Next, in response to the injection start signal, the controller 16 adjusts the flow rate of hydraulic oil supplied to the injection cylinder 6 based on the information from the speed pattern setting device 15, and controls the forward speed pattern of the injection screw 5. Along with this, the molten resin is filled into the individual cavities 3 a to 3 c . The controller 16 transmits these filling conditions to the pressure transmission pins 12 a to 12 c and the in-mold pressure transducer 14 a.
~14 Constantly monitored via b . Filling pressure control is then carried out from the time when the molding state satisfies the conditions for completion of speed control. That is, the pressure and flow rate of the hydraulic oil supplied to the injection cylinder 6 are adjusted and controlled so as to trace the filling pressure increase gradient set as the control target. Further, pressure holding process control is carried out from the time when the mold internal pressure satisfies the conditions for completing the filling process. That is, the pressure and flow rate of the hydraulic oil supplied to the injection cylinder 6 are adjusted and controlled so that the variation behavior of the mold pressure in the cavity, which is set as the main control target, traces the set holding pressure drop gradient.
これらの制御工程を第２図に示す成形状態の変
動挙動により、さらに詳細に説明する。第２図は
第１図に示した装置における個々のキヤビテイ３
ａ〜３c内の溶融樹脂圧力およびスクリユウ５の変
位を時間的な変位としてとらえたものである。こ
の第２図において、主制御目標はキヤビテイ３c
に選択してあり、２１はスクリユウ変位曲線、２
２a〜２２cは型内圧力曲線で、各キヤビテイ３a
〜３cの型内圧力挙動を示す。２６は溶融樹脂の
充填圧力勾配目標値で、この目標値は充填工程開
始圧力２３、保圧工程開始圧力２４cおよび充填
時間３３から決定される。同様に、溶融樹脂の保
持圧力降下勾配目標値で、この目標値は保圧工程
開始圧力２４c、保圧工程完了圧力２５cおよび保
圧時間３４から決定される。射出開始点２８より
コントローラ１６は、射出スクリユウ５を可塑化
完了位置３２、充填工程開始位置３５までの区間
を速度パターン制御する。その後に、充填工程開
始点２９から充填工程の制御に移り、溶融樹脂の
充填状態を制御する。すなわち、コントローラ１
６は主制御目標であるキヤビテイ３cの型内圧力
曲線２２cを監視して目標値である充填圧力上昇
勾配目標値２６に対して偏差が生じた場合には、
それに応じた修正信号を出力し、パワー増幅器１
７d、電気油圧制御弁１８を介して射出成形機４
を制御する。つぎに、コントローラ１６は保圧工
程開始点３０から保圧完了点３１までの区間を、
型内圧力曲線２２cが保持圧力降下勾配目標値２
７をトレースするよう、充填工程と同様な制御を
実施する。 These control steps will be explained in more detail with reference to the fluctuation behavior of the molding state shown in FIG. Figure 2 shows the individual cavities 3 in the device shown in Figure 1.
The molten resin pressure and the displacement of the screw 5 within a to 3c are taken as temporal displacements. In this figure 2, the main control target is cavity 3 c
21 is the screw displacement curve, 2
2 a to 22 c are in-mold pressure curves, and each cavity 3 a
~ 3C shows the in-mold pressure behavior. 26 is a filling pressure gradient target value for the molten resin, and this target value is determined from the filling process start pressure 23, the pressure holding process start pressure 24c , and the filling time 33. Similarly, the holding pressure drop gradient target value for the molten resin is determined from the holding pressure step start pressure 24 c , the holding process completion pressure 25 c and the holding pressure time 34 . The controller 16 controls the speed pattern of the injection screw 5 in a section from the injection start point 28 to the plasticization completion position 32 and the filling process start position 35. Thereafter, control of the filling process starts from the filling process starting point 29, and the filling state of the molten resin is controlled. That is, controller 1
6 monitors the mold pressure curve 22 c of the cavity 3 c , which is the main control target, and if a deviation occurs from the filling pressure increase gradient target value 26, which is the target value,
A corresponding correction signal is output, and the power amplifier 1
7 d , injection molding machine 4 via electro-hydraulic control valve 18
control. Next, the controller 16 determines the section from the pressure holding process start point 30 to the pressure holding completion point 31.
In-mold pressure curve 22 c is the holding pressure drop gradient target value 2
7, the same control as in the filling process is carried out.
コントローラ１６は１サイクル内において、上
述した「動的要因」の制御を実施すると共に、主
制御目標に選択されなかつたキヤビテイ３a，３b
の型内圧力状況を計測し、保圧工程開始圧力２４
ａ，２４b、保圧工程完了圧力２５a，２５bおよび
保持時間３４から規定される保持圧力降下勾配３
６a，３６bを算出し、そのデータの連続的な変動
挙動を基に「静的要因」の制御を実施する。 Within one cycle, the controller 16 performs control of the above-mentioned "dynamic factors" and controls cavities 3 a and 3 b that have not been selected as main control targets.
The pressure inside the mold is measured, and the pressure at which the pressure holding process starts is set at 24.
holding pressure drop gradient 3 defined from holding pressure step completion pressures 25 a , 25 b and holding time 34
6 a and 36 b are calculated, and the "static factors" are controlled based on the continuous fluctuation behavior of the data.
上記１サイクルのキヤビテイ３a，３bの型内圧
力挙動を数サイクルにわたり観測し、保持圧力降
下勾配３６を成形サイクルに対して整理すると、
一般的に第３図に示すような結果が得られる。す
なわち、第３図は、キヤビテイ３aにおける保持
圧力降下勾配３６aを各サイクルに対して連続的
にプロツトした結果と、その圧力の変動挙動を基
にキヤビテイ３aを構成する割型２aに供給される
熱媒体の流量を調整する金型温度調整弁１０aに
対するコントローラ１６の出力結果である。 Observing the in-mold pressure behavior of the cavities 3 a and 3 b during one cycle over several cycles, and organizing the holding pressure drop gradient 36 with respect to the molding cycle, we get the following:
Generally, the results shown in FIG. 3 are obtained. That is, FIG. 3 shows the result of continuously plotting the holding pressure drop gradient 36a in the cavity 3a for each cycle, and the change in the split mold 2a constituting the cavity 3a based on the pressure fluctuation behavior . These are the output results of the controller 16 for the mold temperature adjustment valve 10a that adjusts the flow rate of the supplied heat medium.
キヤビテイ３aの保持圧力降下勾配３６aはキヤ
ビテイ３aを構成している割型２aの温度状態およ
び主制御目標のキヤビテイ３cの型内圧力挙動の
影響を受け、標準値３７aを中心に、その前後に
バラツキを生じる。コントローラ１６は保持圧力
降下勾配３６aの変動傾向４１の結果を数サイク
ルにわたり観測、累積し、保持圧力降下勾配３６
ａが連続的に上昇傾向または下降傾向を示し、標
準値３７aを通過した時点４２、あるいは偏差４
４があらかじめ定めた内部設定値を越えた偏差超
過点４３において、これらの変動挙動に相当した
金型温度修正信号４５aを出力する。これにより
割型２aに供給される熱媒体の流量を調整し、そ
れによつてキヤビテイ３aを構成する金型温度を
制御する。キヤビテイ３bを構成する金型温度も
同様な方法で別個に制御する。 The holding pressure drop gradient 36 a of cavity 3 a is influenced by the temperature state of split mold 2 a that constitutes cavity 3 a and the internal pressure behavior of cavity 3 c , which is the main control target, and is centered around the standard value 37 a . There will be variations before and after that. The controller 16 observes and accumulates the results of the fluctuation trend 41 of the holding pressure drop gradient 36a over several cycles, and calculates the holding pressure drop gradient 36a.
When a shows a continuous upward trend or downward trend and passes the standard value of 37 a , the point is 42, or the deviation is 4.
4 exceeds a predetermined internal setting value, a mold temperature correction signal 45 a corresponding to these fluctuation behaviors is output. This adjusts the flow rate of the heat medium supplied to the split mold 2a , thereby controlling the temperature of the mold constituting the cavity 3a . The temperature of the mold constituting cavity 3b is also separately controlled in a similar manner.
以上述べたように、本発明によれば、成形品品
質に影響を及ぼす「動的要因」と「静的要因」の
両者を所定の成形条件範囲にあるように制御する
ことができる。したがつて、複数キヤビテイ相互
間の成形状態を安定させ、最初の２〜３サイクル
はともかく、それ以後は連続的に良品を供給する
ことができる。さらに、成形状態を追跡制御して
いるため、成形サイクル毎における成形状態の変
動を最小限に抑制することが可能となる。 As described above, according to the present invention, it is possible to control both "dynamic factors" and "static factors" that affect molded product quality so that they are within a predetermined molding condition range. Therefore, the molding conditions between the plurality of cavities are stabilized, and good products can be continuously supplied after the first two or three cycles. Furthermore, since the molding state is tracked and controlled, it is possible to minimize variations in the molding state for each molding cycle.
この結果、成形不良率を従来の1/5以下に低減
することができた。 As a result, we were able to reduce the molding defect rate to less than 1/5 of the conventional rate.
第１図は本発明の実施に用いる射出成形装置の
一実施例を示す構成図、第２図は第１図の装置に
おいて、スクリユウ変位およびキヤビテイ３a〜
３c内の溶融樹脂圧力を時間的な変位としてとら
えた図、第３図は第１図の装置において、キヤビ
テイ３cの保持圧力降下勾配および金型温度調整
弁の制御信号を成形の多数サイクルにわたり観測
した結果を示す図である。
図において、１：成形金型、２：割型、３：キ
ヤビテイ、４：溶融樹脂射出部、５：射出スクリ
ユウ、６：射出シリンダ、７：作動油圧源、８：
熱媒体槽、９：圧送パイプ、１０：金型温度調整
弁（熱媒体流量調整弁）、１１：戻りパイプ、１
２：圧力伝達ピン、１３：型内圧力センサー、１
４：型内圧力変換器、１５：射出速度パターン設
定器、１６：コントローラ、１７：パワー増幅
器、１８：電気油圧制御弁、１９：充填圧力勾配
設定器、２０：保持圧力勾配設定器。
FIG. 1 is a block diagram showing an embodiment of an injection molding apparatus used for carrying out the present invention, and FIG. 2 is a block diagram showing the screw displacement and cavities 3 a to 3 in the apparatus of FIG. 1.
Figure 3 is a diagram showing the molten resin pressure in 3c as a temporal displacement. Figure 3 shows the device shown in Figure 1, in which the holding pressure drop gradient in cavity 3c and the control signal for the mold temperature control valve are controlled for multiple cycles of molding. It is a figure showing the result of observation over the period. In the figure, 1: molding die, 2: split mold, 3: cavity, 4: molten resin injection section, 5: injection screw, 6: injection cylinder, 7: hydraulic pressure source, 8:
Heat medium tank, 9: Pressure feeding pipe, 10: Mold temperature adjustment valve (heat medium flow rate adjustment valve), 11: Return pipe, 1
2: Pressure transmission pin, 13: In-mold pressure sensor, 1
4: In-mold pressure transducer, 15: Injection speed pattern setter, 16: Controller, 17: Power amplifier, 18: Electro-hydraulic control valve, 19: Filling pressure gradient setter, 20: Holding pressure gradient setter.
Claims (1)
複数個の樹脂成形品を同時に成形しうる射出成形
装置による成形方法において、主制御目標に選ん
だ一つのキヤビテイ（以下、これを主キヤビテ
イ、これ以外を副キヤビテイと呼ぶ）の溶融樹脂
の充填工程における充填圧力上昇勾配および保圧
工程における保持圧力降下勾配が所定の設定値と
なるように、上記射出成形装置の射出シリンダに
供給する作動油の圧力および流量を制御すると共
に、上記副キヤビテイについては、各副キヤビテ
イ毎に上記保圧工程における保持圧力降下勾配の
実測値を成形サイクル毎に連続的に求め、上記保
持圧力降下勾配の実測値が所定の設定値を越える
かあるいは上記保持圧力降下勾配の値と上記所定
の設定値との差が所定の値を越えるかしたとき
に、これを修正する方向に上記各副キヤビテイを
構成する金型の温度を上記各副キヤビテイに供給
する熱媒体の流量を調整することによつて制御す
ることを特徴とする射出成形方法。 ２ 複数のキヤビテイを有する成形金型を用いて
複数個の樹脂成形品を同時に成形する射出成形装
置において、上記キヤビテイのそれぞれに充填さ
れる溶融樹脂の圧力を検出する型内圧力センサー
と、上記型内圧力センサーによつて検出された圧
力信号を増幅する型内圧力変換器と、上記型内圧
力変換器、主制御目標に選定した主キヤビテイの
溶融樹脂射出速度パターン設定器、溶融樹脂充填
圧力勾配設定器、溶融樹脂保持圧力勾配設定器に
接続され、溶融樹脂射出機の射出シリンダに供給
する作動油の圧力および流量を制御する制御部に
制御信号を発すると共に、主キヤビテイ以外の副
キヤビテイを構成する金型の加熱用導管に供給す
る熱媒体の流量を制御する熱媒体流量制御弁に制
御信号を発するコントローラをそなえていること
を特徴とする射出成形装置。[Claims] 1. In a molding method using an injection molding device that can simultaneously mold a plurality of resin molded products using a mold having a plurality of cavities, one cavity (hereinafter referred to as The injection cylinder of the above-mentioned injection molding apparatus is adjusted so that the filling pressure increase gradient in the molten resin filling process and the holding pressure drop gradient in the pressure holding process of the main cavity and the others are called sub-cavities are set to predetermined values. In addition to controlling the pressure and flow rate of the hydraulic fluid to be supplied, for each sub-cavity, the actual value of the holding pressure drop gradient in the holding pressure step is continuously determined for each molding cycle, and the holding pressure drop is When the actual measured value of the gradient exceeds a predetermined set value, or when the difference between the holding pressure drop gradient value and the predetermined set value exceeds a predetermined value, each of the sub-cavities is operated in a direction to correct this. An injection molding method characterized in that the temperature of a mold constituting the mold is controlled by adjusting the flow rate of a heat medium supplied to each sub-cavity. 2. In an injection molding apparatus that simultaneously molds a plurality of resin molded products using a mold having a plurality of cavities, an in-mold pressure sensor that detects the pressure of molten resin filled into each of the cavities, and a mold An in-mold pressure transducer that amplifies the pressure signal detected by the internal pressure sensor, the above-mentioned in-mold pressure transducer, a molten resin injection speed pattern setting device for the main cavity selected as the main control target, and a molten resin filling pressure gradient It is connected to the setting device and molten resin holding pressure gradient setting device, and issues a control signal to the control unit that controls the pressure and flow rate of hydraulic oil supplied to the injection cylinder of the molten resin injection machine, and also configures sub cavities other than the main cavity. An injection molding apparatus comprising: a controller that issues a control signal to a heat medium flow control valve that controls the flow rate of heat medium supplied to a heating conduit of a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12678579A JPS5651339A (en) | 1979-10-03 | 1979-10-03 | Method and apparatus for injection molding of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12678579A JPS5651339A (en) | 1979-10-03 | 1979-10-03 | Method and apparatus for injection molding of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5651339A JPS5651339A (en) | 1981-05-08 |
| JPS6323897B2 true JPS6323897B2 (en) | 1988-05-18 |
Family
ID=14943869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12678579A Granted JPS5651339A (en) | 1979-10-03 | 1979-10-03 | Method and apparatus for injection molding of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5651339A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4635309B2 (en) * | 2000-09-12 | 2011-02-23 | 双葉電子工業株式会社 | Defective product detection method and apparatus, and molding apparatus. |
| US11491694B2 (en) * | 2018-06-22 | 2022-11-08 | iMFLUX Inc. | Systems and approaches for controlling an injection molding machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5195459A (en) * | 1975-02-18 | 1976-08-21 | NETSUKASOSEIJUSHISEIKEISOCHI |
-
1979
- 1979-10-03 JP JP12678579A patent/JPS5651339A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5195459A (en) * | 1975-02-18 | 1976-08-21 | NETSUKASOSEIJUSHISEIKEISOCHI |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5651339A (en) | 1981-05-08 |
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