JPH04201533A - Method of controlling dwell in injection molding - Google Patents

Method of controlling dwell in injection molding

Info

Publication number
JPH04201533A
JPH04201533A JP33840690A JP33840690A JPH04201533A JP H04201533 A JPH04201533 A JP H04201533A JP 33840690 A JP33840690 A JP 33840690A JP 33840690 A JP33840690 A JP 33840690A JP H04201533 A JPH04201533 A JP H04201533A
Authority
JP
Japan
Prior art keywords
velocity value
cavity
sound velocity
pressure
value
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.)
Pending
Application number
JP33840690A
Other languages
Japanese (ja)
Inventor
Yasuji Kanemitsu
保二 金光
Hitoshi Kawachi
斉 河内
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.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co 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 Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP33840690A priority Critical patent/JPH04201533A/en
Publication of JPH04201533A publication Critical patent/JPH04201533A/en
Pending legal-status Critical Current

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
    • B29C45/76—Measuring, controlling or regulating
    • 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
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0063—Density

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain a molded item with a constant density by calculating the acoustic value of resin filled in a cavity, and correctly recognizing the dwelling state of resin to be controlled, and then continuously controlling the dwell during the period of a dwelling process such that the acoustic value approaches the set acoustic velocity value pattern on the basis thereof. CONSTITUTION:By a supersonic wave probe 11 provided on a part of the mold 2, supersonic waves are transmitted toward the inner part of a cavity 6. In this instance, the reflected waves of supersonic waves reflected at the side of the cavity 6 is received by the supersonic wave probe 11, and the supersonic wave value of resin filled in the inner part of the cavity is calculated by a supersonic wave flaw detector 10 on the basis of the reflected waves received herein, wherein from the time of starting dwell, the open and closed operation of a hydraulic control valve 15 is controlled by a hydraulic control part 13 in order that the acoustic velocity value approaches the previously set acoustic velocity pattern, thereby controlling the dwelling forces during a dwelling process. Then, the dwelling process is completed when the acoustic velocity value reaches the mold open acoustic velocity value set in advance therein.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、射出成形において、保圧を制御する保圧制御
方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a holding pressure control method for controlling holding pressure in injection molding.

（従来の技術） 従来、射出成形の保圧制御方法としては、例えば、特開
昭５９−１８５６３８号公報記載のものに見られるよう
に、ノズルに設けた樹脂圧力センサによりノズル内の樹
脂圧力を検出し、これに基づいてスクリュウを移動させ
る油圧アクチュエータの油圧を制御することで、射出成
形時の保圧を制御する方法があった。(Prior Art) Conventionally, as a pressure holding control method for injection molding, for example, as shown in the method described in JP-A-59-185638, the resin pressure inside the nozzle is measured using a resin pressure sensor installed in the nozzle. There is a method of controlling the holding pressure during injection molding by detecting this and controlling the hydraulic pressure of a hydraulic actuator that moves the screw based on this detection.

（発明が解決しようとする課題） しかしながら、上記従来のようにノズル内の樹脂圧力に
基づいて油圧アクチュエータの油圧を制御するものでは
、制御する油圧がスクリュウ、ノズル、ゲート、金型へ
と順次圧力伝播する段階で損失を生じたり、この伝播状
態が外的要因により変化するため、ショット毎に保圧を
同しにする保証はなく、保圧が変化するとキャビティ内
への充填重量が変化し、重量オーバになるとパリが生じ
、重量不足になると圧不となり未充填やヒケを生じると
いう問題があった。(Problem to be Solved by the Invention) However, in the conventional system that controls the hydraulic pressure of a hydraulic actuator based on the resin pressure in the nozzle, the controlled hydraulic pressure is sequentially applied to the screw, nozzle, gate, and mold. There is loss during the propagation stage, and this propagation state changes due to external factors, so there is no guarantee that the holding pressure will be the same for each shot, and if the holding pressure changes, the filling weight in the cavity will change. There is a problem in that if the weight is too high, a gap will occur, and if the weight is insufficient, it will become compressed, resulting in underfilling or sink marks.

（課題を解決するための手段） 本発明の射出成形における保圧制御方法は、射出成形に
おいて、金型の一部に設けられた超音波探触子により、
キャビティ内に向けて超音波を発信するとともに、この
キャビティ側で反射された前記超音波の反射波を受信し
、受信した反射波に基づいてキャビティ内に充填された
樹脂の音速値を算出し、保圧が開始された時点から上記
音速値が予め設定された設定音速値パターンに近似する
ように保圧を継続して制御し、音速値が予め設定された
型開き音速値に達した時に保圧を終了するものである。(Means for Solving the Problems) The holding pressure control method in injection molding of the present invention includes, in injection molding, an ultrasonic probe provided in a part of the mold,
While transmitting an ultrasonic wave toward the inside of the cavity, receiving the reflected wave of the ultrasonic wave reflected on the cavity side, and calculating the sound velocity value of the resin filled in the cavity based on the received reflected wave, From the time holding pressure starts, holding pressure is continuously controlled so that the sound speed value approximates a preset set sound speed value pattern, and when the sound speed value reaches the preset mold opening sound speed value, holding pressure is started. This is to end the pressure.

（作用） 射出成形時において、キャビティ内に充填された樹脂の
音速値を算出し、保圧が開始された時点から上記音速値
が予め設定された設定音速値パターンに近似するように
保圧を継続して制御し、音速値が予め設定された型開き
音速値に達した時に保圧を終了することで、保圧終了時
には常に一定の音速値、すなわち一定の密度を持つ成形
品を得ることになり、これにより成形品重量の安定化を
図る。(Function) During injection molding, the sound velocity value of the resin filled in the cavity is calculated, and the holding pressure is applied so that the sound velocity value approximates a preset set sound velocity value pattern from the time when holding pressure is started. By continuously controlling and terminating holding pressure when the sound velocity value reaches the preset mold opening sound velocity value, it is possible to obtain a molded product with a constant sound velocity value, that is, a constant density, at the end of holding pressure. , thereby stabilizing the weight of the molded product.

（実施例） 以下、本発明の一実施例を図面を参照して説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

第１図は、本発明に係る射出成形における保圧制御方法
を実施するための射出成形装置の一部を示している。FIG. 1 shows a part of an injection molding apparatus for carrying out the holding pressure control method in injection molding according to the present invention.

第１図において、２は射出成形機の射出ノズルｌの先端
部に対向配置された金型である。金型２は、分割された
一対の固定型３と可動型５とで構成されており、可動型
５は、図中矢符Ａ方向に往復動自在に設けられており、
この往復動により金型２が開閉する。In FIG. 1, numeral 2 denotes a mold placed opposite to the tip of an injection nozzle l of an injection molding machine. The mold 2 is composed of a pair of divided fixed molds 3 and a movable mold 5, and the movable mold 5 is provided so as to be able to reciprocate in the direction of arrow A in the figure.
The mold 2 opens and closes due to this reciprocating motion.

６は、前記固定型３と可動型５との分割面に面して形成
されたキャビティである。6 is a cavity formed facing the dividing surface between the fixed mold 3 and the movable mold 5.

７は、先端に前記射出ノズル１を設けた射出シリンダで
、この射出シリンダ７内にスクリュウ８が配設されてい
る。スクリュウ８は矢符Ｂ方向に　″往復動自在に構成
されており、スクリュウ８が射出ノズル１側に前進する
ことで射出シリンダ７内の溶融樹脂をキャビティ６に射
出充填するとともに、射出充填した後にスクリュウ８を
前進位置で保持させることでキャビティ６の樹脂に保圧
をかける。スクリュウ８の移動は、第２図に示す油圧制
御弁１５により油圧の供給を制御し油圧アクチュエータ
を作動させることで行われ、従って保圧力も油圧制御弁
１５により制御される。Reference numeral 7 denotes an injection cylinder having the injection nozzle 1 at its tip, and a screw 8 is disposed within this injection cylinder 7. The screw 8 is configured to freely reciprocate in the direction of arrow B, and as the screw 8 advances toward the injection nozzle 1 side, the molten resin in the injection cylinder 7 is injected and filled into the cavity 6. By holding the screw 8 in the forward position, pressure is applied to the resin in the cavity 6.The screw 8 is moved by controlling the supply of hydraulic pressure with the hydraulic control valve 15 shown in FIG. 2 and operating the hydraulic actuator. Therefore, the holding force is also controlled by the hydraulic control valve 15.

また、前記可動型５には第２図に示す超音波探傷機１０
に接続された超音波探触子１１が設けられている。The movable mold 5 also includes an ultrasonic flaw detector 10 shown in FIG.
An ultrasonic probe 11 connected to is provided.

超音波探触子１１は、超音波探傷機１０により前記キャ
ビティ６に向けて５ＭＨｚの超音波を例えば毎秒１００
０回（この発信回数は任意に変更可能である。）発信す
る。この発信された超音波はキャビティ６側で反射され
た後、反射波（エコー波）として超音波探触子１１に受
信され超音波探傷機１０に入力される。超音波探傷機１
０では、反射波に基づいて音速値を算出する。つまり、
キャビティ６に充填された樹脂の音速値を算出する。The ultrasonic probe 11 emits 5 MHz ultrasonic waves toward the cavity 6 using the ultrasonic flaw detector 10 at a rate of, for example, 100 per second.
Call 0 times (this number of calls can be changed arbitrarily). The emitted ultrasonic waves are reflected on the cavity 6 side, and then received by the ultrasonic probe 11 as reflected waves (echo waves) and input into the ultrasonic flaw detector 10. Ultrasonic flaw detector 1
At 0, the sound velocity value is calculated based on the reflected wave. In other words,
The sound velocity value of the resin filled in the cavity 6 is calculated.

ここで、超音波探傷機１０で算出される音速値は溶融樹
脂の樹脂温度の変化乙こより変化する。これは、樹脂温
度が高くなると溶融樹脂の密度が小さくなりこれによっ
て音速値が小さく（遅く）なり、逆に樹脂温度が低くな
ると溶融樹脂の密度が大きくなりこれにより音速値が大
きく　（速く）なるためである。つまり、算出した樹脂
の音速値は密度と対応しており、ある一定の音速値はあ
る密度を表すことになる。Here, the sound velocity value calculated by the ultrasonic flaw detector 10 changes due to a change in the resin temperature of the molten resin. This is because as the resin temperature increases, the density of the molten resin decreases, which causes the sound velocity value to become smaller (slower), and conversely, as the resin temperature decreases, the density of the molten resin increases, which causes the sound velocity value to increase (faster). It's for a reason. In other words, the calculated sound speed value of the resin corresponds to the density, and a certain sound speed value represents a certain density.

そして、超音波探傷機ｌＯは、第２図に示すように、こ
の超音波探傷機１０で算出された音速値が入力される比
較器１２に接続されている。比較器１２は、この算出し
た音速値と予め設定した設定音速値パターンとを比較す
る。この設定音速値パターンは、良品の得られる成形条
件にて音速値を測定し設定する。As shown in FIG. 2, the ultrasonic flaw detector IO is connected to a comparator 12 into which the sound velocity value calculated by the ultrasonic flaw detector 10 is input. The comparator 12 compares the calculated sound speed value with a preset sound speed value pattern. This set sound velocity value pattern is set by measuring the sound velocity value under molding conditions that yield a good product.

また、比較器１２は、この比較器１２で比較された比較
結果を油圧制御部１３に出力する。油圧制御部１３では
この信号に基づいて油圧制御弁１５の開閉を制御し、こ
れにより保圧工程時の保圧力を制御する。Further, the comparator 12 outputs the comparison result made by the comparator 12 to the hydraulic pressure control section 13. The hydraulic control unit 13 controls the opening and closing of the hydraulic control valve 15 based on this signal, thereby controlling the holding force during the holding pressure process.

次に、上述のように構成された射出成形装置による保圧
制御方法について説明する。Next, a method of controlling pressure using the injection molding apparatus configured as described above will be described.

まず、射出成形機の射出ノズル１から射出された溶融樹
脂は、キャビティ６に充填される。これに伴って超音波
探傷機１０により超音波探触子１１からキャビティ６に
向けて５ＭＨｚの超音波を毎秒１０００回発信する。First, the cavity 6 is filled with molten resin injected from the injection nozzle 1 of the injection molding machine. Along with this, the ultrasonic flaw detector 10 transmits 5 MHz ultrasonic waves from the ultrasonic probe 11 toward the cavity 6 1000 times per second.

このようにして発信された超音波はキャビティ６側でそ
れぞれ反射され反射波として超音波探触子１１で受信さ
れる。そして、超音波探傷機ｌＯでは、これら反射波か
らキャビティ６内の樹脂を通過した時間を算出し、この
通過時間から音速値を算出する。この音速値の算出は射
出充填後の保圧開始時点から行う。The ultrasonic waves emitted in this manner are each reflected on the cavity 6 side and received by the ultrasonic probe 11 as reflected waves. Then, the ultrasonic flaw detector IO calculates the time it takes for the reflected waves to pass through the resin in the cavity 6, and calculates the sound velocity value from this passage time. Calculation of this sound velocity value is performed from the time when pressure retention starts after injection and filling.

そして、算出された音速値は比較器１２に出力され、比
較器１２では、保圧工程が開始されると、算出した上記
音速値と設定音速値パターン（第３図実線参照）とを比
較し、設定音速値〉音速値（第３図２点鎖線参照）、設
定音速値く音速値（第３図破線参照）、設定音速値−音
速値、及び設定音速値〉音速値、設定音速値〈音速値の
場合はその差異を算出し、その比較信号を油圧制御部１
３に出力する。油圧制御部１３では比較信号に基づいて
音速値を設定音速値パターンに近似させるに必要な油圧
制御弁１５の開度を算出し、油圧制御弁１５の開度の信
号に変換した制御信号として油圧制御弁１５に出力する
。この制御を例えば０．０５秒毎継続して行い、音速値
が型開き時の音速値に達した時点で保圧を終了する。Then, the calculated sound speed value is output to the comparator 12, and when the pressure holding process is started, the comparator 12 compares the calculated sound speed value with the set sound speed value pattern (see the solid line in Figure 3). , set sound speed value>sound speed value (see the two-dot chain line in Figure 3), set sound speed value - sound speed value (see the broken line in Figure 3), set sound speed value - sound speed value, and set sound speed value>sound speed value, set sound speed value < In the case of sound velocity values, the difference is calculated and the comparison signal is sent to the hydraulic control unit 1.
Output to 3. The hydraulic control unit 13 calculates the opening degree of the hydraulic control valve 15 necessary to approximate the sound velocity value to the set sound velocity value pattern based on the comparison signal, and outputs the hydraulic pressure as a control signal converted into a signal of the opening degree of the hydraulic control valve 15. Output to control valve 15. This control is continuously performed, for example, every 0.05 seconds, and the holding pressure is ended when the sound velocity value reaches the sound velocity value at the time of mold opening.

このように、キャビティ内に充填された樹脂の音速値を
算出することで、制御しようとする樹脂の保圧状態を的
確に把握し、これに基づいて音速値が設定音速値パター
ンに近似するよう保圧工程時の保圧を継続して制御する
ため、保圧をショット毎に同じにでき、しかも音速値が
予め設定された型開き音速値に達した時に保圧工程を終
了することで、保圧終了時には常に一定の音速値、すな
わち一定の密度を持つ成形品を得ることになり、成形品
重量の安定化を図ることができる。In this way, by calculating the sound velocity value of the resin filled in the cavity, the pressure holding state of the resin to be controlled can be accurately grasped, and based on this, the sound velocity value can be approximated to the set sound velocity value pattern. In order to continuously control the holding pressure during the holding pressure process, the holding pressure can be made the same for each shot, and the holding pressure process is ended when the sound velocity value reaches the preset mold opening sound velocity value. At the end of the holding pressure, a molded product with a constant sound velocity value, that is, a constant density is obtained, and the weight of the molded product can be stabilized.

下記の表は、本発明の方法と従来方法とによりＡＢＳ樹
脂でそれぞれ成形品を形成した場合を比較したものであ
る。成形品数は１００個である。The table below compares the cases in which molded articles were formed from ABS resin using the method of the present invention and the conventional method. The number of molded products is 100.

表 この表かられかるように、本発明の方法の方が重量のバ
ラツキが少なく、重量オーバによるハリの発生や、重量
不足に起因する圧下による未充填及びヒケなどの発生も
少ない。As can be seen from this table, the method of the present invention has less variation in weight, less occurrence of firmness due to excess weight, and less occurrence of unfilling and sink marks due to reduction due to insufficient weight.

（発明の効果） 以上述べたように、本発明の方法によれば、キャビティ
内に充填された樹脂の音速値を算出することで、制御し
ようとする樹脂の保圧状態を的確に把握し、これに基づ
いて音速値が設定音速値パターンに近似するよう保圧工
程時の保圧を継続して制御するため、保圧をショット毎
に同じにでき、しかも音速値が予め設定された型開き音
速値に達した時に保圧工程を終了することで、保圧終了
時には常に一定の音速値、丁なわち一定の密度を持つ成
形品を得ることができ、成形品の重量の一定化を図るこ
とができる。これにより、重量オーバによるハリの発生
や、重量不足に起因する圧下による未充填、ヒケなどの
発生を防止でき成形効率の向上を図ることができるとと
もに、成形開始時の不良数も減少する。(Effects of the Invention) As described above, according to the method of the present invention, by calculating the sound velocity value of the resin filled in the cavity, the holding pressure state of the resin to be controlled can be accurately grasped. Based on this, the holding pressure during the packing process is continuously controlled so that the sound velocity value approximates the set sound velocity value pattern, so the holding pressure can be the same for each shot, and the mold can be opened with the sound velocity value set in advance. By ending the pressure holding process when the sonic velocity value is reached, it is possible to obtain a molded product with a constant sound velocity value and a constant density at the end of the pressure holding, which helps to keep the weight of the molded product constant. be able to. As a result, it is possible to prevent the occurrence of firmness due to excess weight, unfilling and sink marks due to reduction due to insufficient weight, improve molding efficiency, and reduce the number of defects at the start of molding.

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

第１図は本発明に係る射出成形における保圧制御方法を
実施する射出成形装置の一部を示す断面図、第２図は制
御系を示すブロック図、第３図は射出形成時において時
間とキャビティ内の樹脂の音速値との関係を示す図であ
る。 ２−・・金型 ６・・・キャビティ １１・・・超音波探触子 第２図 第３図FIG. 1 is a sectional view showing a part of an injection molding apparatus that implements the holding pressure control method in injection molding according to the present invention, FIG. 2 is a block diagram showing the control system, and FIG. It is a figure showing the relationship with the sound velocity value of resin in a cavity. 2-...Mold 6...Cavity 11...Ultrasonic probe Fig. 2 Fig. 3

Claims (1)

【特許請求の範囲】[Claims] １）射出成形において、金型の一部に設けられた超音波
探触子により、キャビティ内に向けて超音波を発信する
とともに、このキャビティ側で反射された前記超音波の
反射波を受信し、受信した反射波に基づいてキャビティ
内に充填された樹脂の音速値を算出し、保圧が開始され
た時点から上記音速値が予め設定された設定音速値パタ
ーンに近似するように保圧を継続して制御し、音速値が
予め設定された型開き音速値に達した時に保圧を終了す
ることを特徴とする射出成形における保圧制御方法。1) In injection molding, an ultrasonic probe installed in a part of the mold emits ultrasonic waves into the cavity and receives reflected waves of the ultrasonic waves reflected from the cavity side. , calculates the sound velocity value of the resin filled in the cavity based on the received reflected waves, and maintains the pressure so that the sound velocity value approximates a preset set sound velocity value pattern from the time the pressure retention is started. A pressure holding control method in injection molding, characterized by continuously controlling and terminating holding pressure when a sound velocity value reaches a preset mold opening sound velocity value.
JP33840690A 1990-11-30 1990-11-30 Method of controlling dwell in injection molding Pending JPH04201533A (en)

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Application Number Priority Date Filing Date Title
JP33840690A JPH04201533A (en) 1990-11-30 1990-11-30 Method of controlling dwell in injection molding

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Application Number Priority Date Filing Date Title
JP33840690A JPH04201533A (en) 1990-11-30 1990-11-30 Method of controlling dwell in injection molding

Publications (1)

Publication Number Publication Date
JPH04201533A true JPH04201533A (en) 1992-07-22

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JP33840690A Pending JPH04201533A (en) 1990-11-30 1990-11-30 Method of controlling dwell in injection molding

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821012A1 (en) * 2001-02-22 2002-08-23 Dassault Aviat Molded component manufacturing procedure, especially using Resin Transfer Moldings uses ultrasound waves to determine quality

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821012A1 (en) * 2001-02-22 2002-08-23 Dassault Aviat Molded component manufacturing procedure, especially using Resin Transfer Moldings uses ultrasound waves to determine quality

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