JPS63293026A - Method and device for injection molding - Google Patents

Method and device for injection molding

Info

Publication number
JPS63293026A
JPS63293026A JP12868587A JP12868587A JPS63293026A JP S63293026 A JPS63293026 A JP S63293026A JP 12868587 A JP12868587 A JP 12868587A JP 12868587 A JP12868587 A JP 12868587A JP S63293026 A JPS63293026 A JP S63293026A
Authority
JP
Japan
Prior art keywords
mold
strain
injection molding
injection
retainer plate
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
JP12868587A
Other languages
Japanese (ja)
Inventor
Masahiko Okumura
雅彦 奥村
Hiroshi Kiyono
清野 坦
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 JP12868587A priority Critical patent/JPS63293026A/en
Publication of JPS63293026A publication Critical patent/JPS63293026A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating

Landscapes

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

Abstract

PURPOSE:To improve yield of a molded product by minimizing a volumetric change of a cavity, by a method wherein an injection device is controlled based on a detected value of a quantity of a transformation of a mold so as to hold a strain of the mold at a preset value, and after gate seal a back pressure device is controlled so that the strain is restored to the original state. CONSTITUTION:A cavity 16 is formed on a mating surface between a retainer plate 12 and movable retainer plate 13 and a strain of the movable retainer plate 13 is detected by a strain gauge 5 provided on the rear side of the opposite side of the cavity 16. Then the movable retainer plate 13 is pressed from the rear side by hydraulic cylinders 61, 61 of a back pressure device 6 provided between the movable retainer plate 13 and a die plate 15, and a strain generated on the movable retainer plate 13 is restored to the original state. The strain detected by the strain gauge 5 is applied to a control part 18, the control part 18 performs feedback control of an injection device 2 until gate seal of the control part 18 is performed so that a preset strain pattern is held. Then after the gate seal has been performed, a back pressure device 6 is controlled so that the strain is restored to the original state.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、射出成形における成形方法およびその装置に
関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding method and apparatus for injection molding.

(従来の技術) 従来の射出成形方法に関しては、例えば特公昭58−5
2486号公報に記載されたものが知られている。
(Prior art) Regarding the conventional injection molding method, for example, Japanese Patent Publication No. 58-5
The one described in Japanese Patent No. 2486 is known.

この方法は、射出成形用金型のランチ部等に樹脂圧力を
検出する圧力検出器を設け、この圧力検出器による検出
に基づいて、予め設定された型内圧を保持するよう射出
成形機の射出装置を制御していた。
This method involves installing a pressure detector that detects resin pressure in the launch section of an injection mold, and then controlling the injection molding machine to maintain a preset mold internal pressure based on the detection by this pressure detector. controlled the device.

(発明が解決しようとする問題点) しかしながら、上記従来の方法では、次のような問題が
ある。
(Problems to be Solved by the Invention) However, the above conventional method has the following problems.

■ 圧力検出器を射出成形用金型内に取付けなければな
らず、このため大幅な金型の改造が必要になりコスト高
になるとともに、構造が複雑になる。
■ The pressure detector must be installed inside the injection mold, which requires major modification of the mold, increasing costs and making the structure complex.

■ 上記従来のように型内圧制御方法によって成形され
た成形品は、型内圧制御を行っていない通常の射出成形
方法によって成形された成形品に比ベヒケ、ソリの発生
がいくぶん改善されるものの、これらヒケ、ソリは依然
発生する。
■ Although molded products molded using the conventional mold pressure control method described above are somewhat less prone to shrinkage and warpage than molded products molded by normal injection molding methods that do not perform mold pressure control, These sink marks and warpage still occur.

また、第6図および第7図は、上記従来で述べたような
型内圧制御を行っていない通常の射出成形方法によって
射出成形を行った時の経過時間と型内圧との関係および
経過時間とひずみとの関係を示したもので、それぞれ保
圧を1000 kir/cd。
In addition, FIGS. 6 and 7 show the relationship between the elapsed time and the mold internal pressure and the elapsed time when injection molding is performed by a normal injection molding method that does not control the mold internal pressure as described in the conventional section. This shows the relationship with strain, and the holding pressure is 1000 kir/cd.

600 kg/c+J、 Okg/−に設定した場合の
各パターンを示している。
Each pattern is shown when set to 600 kg/c+J and Okg/-.

これにより、第7図に示すひずみパターンは、第6図に
示す型内圧パターンと略同−のパターンを示し、しかも
、ひずみパターンの方が充填完了点Aおよびピーク点B
(保圧が600kg/ctAおよびQ kg / cJ
の場合のピーク点はB’)をグラフの変曲点としてより
明確に表していることがわかる。
As a result, the strain pattern shown in FIG. 7 shows approximately the same pattern as the mold internal pressure pattern shown in FIG.
(Holding pressure is 600 kg/ctA and Q kg/cJ
It can be seen that the peak point in case B') more clearly represents the inflection point of the graph.

つまり、金型に生じるひずみに基づいて制御する方が、
より精度および応答性の高い制御ができることがわかる
In other words, it is better to control based on the strain generated in the mold.
It can be seen that control with higher precision and responsiveness is possible.

(問題点を解決するための手段) 本発明の射出成形方法は、射出成形用金型に該射出成形
用金型の変形量を検出する検出器を設けるとともに、射
出成形時にこの射出成形用金型に生じた変形を元の状態
に戻すための逆圧装置を備え、射出成形時において、前
記検出器で検出された射出成形用金型の変形量に基づい
て、ゲートシールされるまでは予め設定された所望の変
形量が得られるように射出成形機の射出装置を制御し、
ゲートシールされた後は、射出成形用金型に生じた変形
を元の状態に戻すように逆圧装置を制御するものである
(Means for Solving the Problems) The injection molding method of the present invention includes providing an injection mold with a detector for detecting the amount of deformation of the injection mold, and It is equipped with a counter pressure device to return the deformation that has occurred in the mold to its original state, and during injection molding, it is equipped with a Control the injection device of the injection molding machine to obtain the set desired amount of deformation,
After the gate is sealed, the counter pressure device is controlled to restore the deformation that occurred in the injection mold to its original state.

また、本発明の射出成形装置は、射出成形機と′射出成
形用金型からなる射出成形装置において、前記射出成形
用金型に設けられ、該射出成形用金型に生じる変形量を
検出する検出器と、射出成形用金型に生じた変形を元の
状態に戻すように作用する逆圧装置と、前記検出器によ
る検出に基づいて、前記射出成形機の射出装置および前
記逆圧装置を制御する制御部とを備えたものである。
The injection molding apparatus of the present invention is an injection molding apparatus comprising an injection molding machine and an injection mold. a detector, a counter pressure device that acts to return deformation that has occurred in the injection mold to its original state, and an injection device and the counter pressure device of the injection molding machine based on the detection by the detector. The control unit is equipped with a control section for controlling.

(作用) 射出成形時において、型内圧と同様なパターンを示し、
かつ型内圧よりも変曲点が明確に顕れるひずみパターン
に基づいてパターン制御を行う。
(Function) During injection molding, it shows the same pattern as the mold internal pressure,
In addition, pattern control is performed based on the strain pattern in which the inflection point is more clearly revealed than the mold internal pressure.

すなわち、ゲートシールされるまでは、検出器で検出さ
れるひずみに基づいて、金型に生じるひずみを予め設定
された所望の設定値を保持(結果的に型内圧も一定圧力
に保持される)するように射出装置を制御し、ゲートシ
ール後はひずみを元の状態に戻すように逆圧装置を制御
して、キャビティの容積変化を最小限にする。
In other words, until the gate is sealed, the strain generated in the mold is maintained at a preset desired value based on the strain detected by the detector (as a result, the mold internal pressure is also maintained at a constant pressure). After gate sealing, the injection device is controlled so that the strain is returned to its original state, and the back pressure device is controlled to return the strain to its original state, thereby minimizing changes in the volume of the cavity.

(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装置を示している。FIG. 1 shows an injection molding apparatus according to the invention.

この射出成形装置は、射出成形機1と射出成形用金型1
0(以下、単に金型という)とから構成されている。
This injection molding device consists of an injection molding machine 1 and an injection mold 1.
0 (hereinafter simply referred to as a mold).

射出成形機1は、射出袋W2と、型締装置3と、材料供
給装置4とから構成されている。材料供給装置4は、ホ
ッパ41内に貯留された樹脂を順次射出装置2に供給す
るように構成されている。射出装置f2は、ホッパ41
からシリンダ22内に供給された樹脂がスクリュー21
の回転によりシリンダ22の先端部に送られながら溶融
され、この溶融樹脂がシリンダ22の先端部に送られる
ことによりスクリュー21が後退(図において右方向)
し、この後スクリュー21を油圧機構23で前進させる
ことによってシリンダ22の先端のノズル24から樹脂
を射出するように構成されている。
The injection molding machine 1 includes an injection bag W2, a mold clamping device 3, and a material supply device 4. The material supply device 4 is configured to sequentially supply the resin stored in the hopper 41 to the injection device 2. The injection device f2 has a hopper 41
The resin supplied into the cylinder 22 from the screw 21
As the resin rotates, it is melted while being sent to the tip of the cylinder 22, and this molten resin is sent to the tip of the cylinder 22, causing the screw 21 to retreat (toward the right in the figure).
After this, the resin is injected from a nozzle 24 at the tip of the cylinder 22 by advancing the screw 21 using a hydraulic mechanism 23.

型締装置3は、金型10を所定の型締力で型締めするも
のであり、この型締装置3で型締めされた金型lO内に
前記射出装置2によって樹脂を射出する。
The mold clamping device 3 clamps the mold 10 with a predetermined mold clamping force, and the injection device 2 injects resin into the mold lO clamped by the mold clamping device 3.

金型10は、第1図および第2図に示すように、固定側
取付板11、固定型板12、可動型板13、スペーサブ
ロック14、可動側取付板15がら構成されている。固
定型板12と可動型板13との合わせ面にはキャビティ
16が形成されている。
As shown in FIGS. 1 and 2, the mold 10 includes a fixed mounting plate 11, a fixed mold plate 12, a movable mold plate 13, a spacer block 14, and a movable mounting plate 15. A cavity 16 is formed in the mating surfaces of the fixed mold plate 12 and the movable mold plate 13.

可動型板13におけるキャビティ16と反対側の裏面に
は、ストレンゲージ5が設けられている。
A strain gauge 5 is provided on the back surface of the movable mold plate 13 on the opposite side from the cavity 16.

ストレンゲージ5は、射出成形時において、可動型板I
3に生じるひずみを検出するもので、このストレンゲー
ジ5は、可動型板13の裏面であってひずみが顕著に生
じる位置に取付けられている。
The strain gauge 5 is connected to the movable mold plate I during injection molding.
This strain gauge 5 is attached to the back surface of the movable mold plate 13 at a position where significant strain occurs.

よって、ストレンゲージ5を取付ける位置は、キャビテ
ィ16の形状、金型10の材質等を考慮して決定される
Therefore, the position at which the strain gauge 5 is attached is determined by taking into consideration the shape of the cavity 16, the material of the mold 10, etc.

さらに、可動型板13と可動側取付板15との間には逆
圧装置6が設けられている。逆圧装置6は、可動型板1
3に生じたひずみを元の状態に戻す(つまり、ひずみを
ゼロにする)ためのもので、図示例では2個の油圧シリ
ンダ61.61が用いられている。これら油圧シリンダ
61.61は、該可動型板13に生じたひずみを元の状
態に戻すための最も効果的な位置に取付けられている。
Further, a counter pressure device 6 is provided between the movable mold plate 13 and the movable mounting plate 15. The counter pressure device 6 is connected to the movable mold plate 1
This is for restoring the strain caused in the cylinder 3 to its original state (that is, making the strain zero), and in the illustrated example, two hydraulic cylinders 61 and 61 are used. These hydraulic cylinders 61, 61 are installed at the most effective position for returning the strain caused to the movable mold plate 13 to its original state.

つまり、油圧シリンダ61.61で可動型板13を裏面
から第1図において右方向に押圧し、可動型板13に生
じたひずみを元の状態に戻す。油圧シリンダ61.61
を取り付ける位置も前記ストレンゲージ5を取り付ける
位置と同様、キャビティ16の形状、金型10の材質等
を考慮して決定される。
That is, the movable mold plate 13 is pressed from the back side to the right in FIG. 1 by the hydraulic cylinders 61, 61, and the strain generated in the movable mold plate 13 is returned to its original state. Hydraulic cylinder 61.61
Similarly to the position where the strain gauge 5 is attached, the position where the strain gauge 5 is attached is determined by taking into account the shape of the cavity 16, the material of the mold 10, etc.

また、ストレンゲージ5で検出されたひずみは制御部1
8に入力される。制御部18は、射出成形時において、
予め設定された所望のひずみパターンを保持するよう、
ゲートシールされるまではストレンゲージ5で検出され
たひずみに基づいて射出装置2をフィードバック制御す
るとともに、ゲートシールされた後はひずみを元の状態
に戻すように逆圧装置6を制御するものである。また、
制御部18にはゲートがシールされる時間t1が予め入
力されており、ゲートシール時間1.に達した時にこの
制御部18から逆圧装置6を作動させる信号が出力され
る。ゲートシール時間t、はゲートの形状、金型冷却温
度等を考慮して決定される。なお、図中の符号17は油
圧シリンダ61゜61を安定配置させるための固定板、
19はオシロ等の記録計であり、この記録計19はスト
レンゲージ5によって検出されたひずみを記録する。
In addition, the strain detected by the strain gauge 5 is
8 is input. During injection molding, the control unit 18
to maintain the desired preset strain pattern.
Until the gate is sealed, the injection device 2 is feedback-controlled based on the strain detected by the strain gauge 5, and after the gate is sealed, the counterpressure device 6 is controlled to return the strain to its original state. be. Also,
The time t1 for sealing the gate is input in advance to the control unit 18, and the gate sealing time 1. When this is reached, a signal for activating the reverse pressure device 6 is output from the control section 18. The gate sealing time t is determined in consideration of the gate shape, mold cooling temperature, etc. In addition, the reference numeral 17 in the figure is a fixing plate for stably arranging the hydraulic cylinder 61.
19 is a recorder such as an oscilloscope, and this recorder 19 records the strain detected by the strain gauge 5.

次に、以上のように構成された射出成形装置における射
出成形方法について第3図に基づいて説明する。
Next, an injection molding method using the injection molding apparatus configured as above will be explained based on FIG. 3.

第3図に示す実線は本発明の射出成形方法によるひずみ
パターンを示している。
The solid line shown in FIG. 3 shows the strain pattern produced by the injection molding method of the present invention.

まず、射出装置2によって樹脂を金型10のキャビティ
16内に射出すると、樹脂がキャビティ16内に充填圧
縮され、金型10のひずみはピーク点Qに達する。この
ピーク点Qからゲートシール点Pまでは、制御部18は
ストレンゲージ5で検出されるひずみに基づいて射出装
置2をフィードバック制御する。つまり、射出装置2に
よって保圧を調節することで予め設定された所望の設定
値を保持するようにひずみを制御する。このように、ひ
ずみを制御することによって、前述したようにひずみと
略同−のパターンを示す型内圧が制御されることになる
。さらに、ゲートシール点Pに達する(時間1.になる
)と、制御部18はひずみが略ゼロになるよう逆圧装置
6を制御し、ひずみは20点で略ゼロになりこの状態で
保持される。
First, when resin is injected into the cavity 16 of the mold 10 by the injection device 2, the resin is filled and compressed into the cavity 16, and the strain in the mold 10 reaches a peak point Q. From this peak point Q to the gate seal point P, the control unit 18 performs feedback control of the injection device 2 based on the strain detected by the strain gauge 5. That is, by adjusting the holding pressure by the injection device 2, the strain is controlled so as to maintain a desired preset value. By controlling the strain in this manner, the mold pressure, which exhibits substantially the same pattern as the strain as described above, is controlled. Furthermore, when the gate sealing point P is reached (at time 1), the control unit 18 controls the counterpressure device 6 so that the strain becomes approximately zero, and the strain becomes approximately zero at the 20th point and is maintained in this state. Ru.

なお、第3図に示す点線は、一般的な射出成形によって
生じるひずみパターンを示したもので、ひずみは、樹脂
の収縮にともなってピーク点Qから徐々に減少していく
。また、第3図に示す一点鎖線は、型内圧制御法によっ
て生じるひずみパターンを示したもので、ピーク点Qか
らゲートシール点Pまでは本発明の射出成形方法による
ひずみパターンと同様であり、ゲートシール点Pから樹
脂の収縮にともなって徐々に減少していく。
Note that the dotted line shown in FIG. 3 shows a strain pattern caused by general injection molding, and the strain gradually decreases from the peak point Q as the resin contracts. Furthermore, the one-dot chain line shown in FIG. 3 shows the strain pattern caused by the mold internal pressure control method, and the strain pattern from the peak point Q to the gate sealing point P is the same as the strain pattern according to the injection molding method of the present invention. It gradually decreases from the sealing point P as the resin contracts.

第4図は、型内圧制御方法および本発明の射出成形方法
によって射出成形を行った時の経過時間と型内圧との関
係を示したものである。
FIG. 4 shows the relationship between the elapsed time and the mold internal pressure when injection molding is performed using the mold internal pressure control method and the injection molding method of the present invention.

図において、まず型内圧制御方法による場合、型内圧は
ピーク点Qからゲートシール点Pまで略一定に保持され
、ゲートシール後は、樹脂の収縮にともなって点線で示
すようなカーブを描く。これに対して、本発明の射出成
形方法による場合、ピーク点Qからゲートシール点Pま
では、金型に生じるひずみに基づいて射出装置2を制御
しているため、型内圧制御方法と同様に型内圧が略一定
に保持される。さらに、ゲートシール後も20点(逆圧
装置6でひずみを強制的にゼロにした時の点)まで逆圧
装置6の作用によって型内圧が略一定して保持され、こ
の後、樹脂の収縮により徐々に減少する。つまり、型内
圧制御方法では、ゲートシール点P以後の制御が不可能
であったのに対して、本発明ではゲートシール点Pから
20点までの間で逆圧装置6により型内圧を制御してい
ることになる。
In the figure, first, when the mold internal pressure control method is used, the mold internal pressure is held substantially constant from the peak point Q to the gate sealing point P, and after the gate sealing, a curve as shown by the dotted line is drawn as the resin contracts. On the other hand, in the case of the injection molding method of the present invention, since the injection device 2 is controlled based on the strain generated in the mold from the peak point Q to the gate seal point P, the injection molding method is similar to the mold internal pressure control method. The mold internal pressure is maintained approximately constant. Furthermore, even after the gate is sealed, the pressure inside the mold is maintained approximately constant by the action of the counter pressure device 6 up to point 20 (the point when the strain is forcibly reduced to zero by the counter pressure device 6), after which the resin shrinks. gradually decreases due to In other words, in the mold internal pressure control method, it was impossible to control after the gate seal point P, whereas in the present invention, the mold internal pressure is controlled from the gate seal point P to 20 points by the reverse pressure device 6. This means that

表1は、型内圧制御を行っていない通常の射出成形方法
、型内圧制御方法および本発明の射出成形方法によって
、それぞれ同一形状の成形品を成形した場合における成
形品のソリ量およびヒケ量を測定した結果を示している
。成形品7は、第5図に示すように長さ100mm、幅
60鰭、高さ30mm、肉厚3龍に形成されたもので、
材料はABS樹脂が使用されている。測定ポイントは、
ボス72゜72間の底板71に発生するソリIAと、リ
プ73が設けられた底板71の底面側の位置Bに発生す
るヒケ量について行った。
Table 1 shows the amount of warpage and sinkage of molded products when molded products of the same shape are molded by the normal injection molding method without mold internal pressure control, the mold internal pressure control method, and the injection molding method of the present invention, respectively. Shows the measured results. The molded product 7 has a length of 100 mm, a width of 60 fins, a height of 30 mm, and a wall thickness of 3 dragons, as shown in FIG.
The material used is ABS resin. The measurement point is
The warpage IA occurring on the bottom plate 71 between the bosses 72 and 72 and the amount of sink marks occurring at position B on the bottom side of the bottom plate 71 where the lip 73 is provided were examined.

表1 この結果かられかるように、本発明に係る射出成形方法
によれば、従来の型内圧制御方法に比ベソリ、ヒケをさ
らに改善すること、ができ、成形品の歩留の向上を図る
ことができる。
Table 1 As can be seen from the results, according to the injection molding method of the present invention, it is possible to further improve sagging and sink marks compared to the conventional mold internal pressure control method, and improve the yield of molded products. be able to.

なお、逆圧装置6は油圧シリンダ61に限らず、空圧シ
リンダなど、金型10(可動型板13)に生じたひずみ
を元の状態に戻す方向に該金型10を押圧するものであ
ればよい。また、金型の変位を検出する検出器はストレ
ンゲージ5に限らず変位計等を用いてもよい。
Note that the counter pressure device 6 is not limited to the hydraulic cylinder 61, but may be a pneumatic cylinder or the like that presses the mold 10 (movable mold plate 13) in a direction to return the strain generated in the mold 10 to its original state. Bye. Further, the detector for detecting the displacement of the mold is not limited to the strain gauge 5, and a displacement meter or the like may be used.

(発明の効果) 以上述べたように、本発明によれば、逆圧装置によりひ
ずみをゼロにするまでゲートシール後も型内圧が保持さ
れるため、成形品のヒケ、ソリをほとんどなくすことが
でき、成形品の歩留を向上させることができる。また、
本発明は、金型に生じるひずみを検出しこのひずみに基
づいて射出成形装置の射出装置を制御して型内圧を制御
しているため、従来のような方法に比べて、精度かつ応
答性の高い制御が実現できる。さらに、ひずみを検出す
る検出器および逆圧装置は金型に容易に取り付けられる
ため、従来のように圧力検出器を金型に取りつけるのに
比べ、構造が簡単になるとともに、コストも安く済む。
(Effects of the Invention) As described above, according to the present invention, the pressure inside the mold is maintained even after gate sealing until the strain is reduced to zero by the counterpressure device, so it is possible to almost eliminate sink marks and warpage of the molded product. It is possible to improve the yield of molded products. Also,
The present invention detects the strain that occurs in the mold and controls the injection device of the injection molding device based on this strain to control the mold internal pressure, so it is more accurate and responsive than conventional methods. A high degree of control can be achieved. Furthermore, since the strain detector and the counter pressure device can be easily attached to the mold, the structure is simpler and the cost is lower than the conventional method of attaching a pressure detector to the mold.

【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装置の概略構成を示す側
面図、第2図はストレンゲージおよび油圧シリンダ(逆
圧装置)が設けられた射出成形用金型を示す斜視図、第
3図は射出成形時における経過時間と金型ひずみとの関
係を示す図、第4図は射出形成時における経過時間と型
内圧との関係を示す図、第5図はソリおよびヒケを測定
した成形品の形状および測定ポイントを示す断面図、第
6図は型内圧制御を行っていない通常の射出成形方法に
よって射出成形を行った時の経過時間と型内圧との関係
を示す図、第7図は型内圧制御を行っていない通常の射
出成形方法によって射出成形を行った時の経過時間と金
型ひずみとの関係を示す図である。 1・・・射出成形機   2・・・射出装置3・・・型
締装置    4・・・材料供給装置5・・・ストレン
ゲージ(検出器) 6・・・逆圧装置   10・・・射出成形用金型18
・・・制御部 第2図 第3図 t+ po      (S) 時間 第4図 t+       (S) 時間
FIG. 1 is a side view showing a schematic configuration of an injection molding apparatus according to the present invention, FIG. 2 is a perspective view showing an injection mold equipped with a strain gauge and a hydraulic cylinder (reverse pressure device), and FIG. Figure 4 is a diagram showing the relationship between elapsed time and mold strain during injection molding, Figure 4 is a diagram showing the relationship between elapsed time and mold internal pressure during injection molding, and Figure 5 is a molded product with warpage and sink marks measured. Figure 6 is a cross-sectional view showing the shape and measurement points of the mold, Figure 6 is a diagram showing the relationship between elapsed time and mold pressure when injection molding is performed by a normal injection molding method without mold pressure control, and Figure 7 is a diagram showing the relationship between elapsed time and mold pressure. FIG. 3 is a diagram showing the relationship between elapsed time and mold distortion when injection molding is performed by a normal injection molding method without mold internal pressure control. 1... Injection molding machine 2... Injection device 3... Mold clamping device 4... Material supply device 5... Strain gauge (detector) 6... Back pressure device 10... Injection molding Mold 18
...Control unit Fig. 2 Fig. 3 t+ po (S) Time Fig. 4 t+ (S) Time

Claims (1)

【特許請求の範囲】 1)射出成形用金型に該射出成形用金型の変形量を検出
する検出器を設けるとともに、射出成形時にこの射出成
形用金型に生じた変形を元の状態に戻すための逆圧装置
を備え、射出成形時において、前記検出器で検出された
射出成形用金型の変形量に基づいて、ゲートシールされ
るまでは予め設定された所望の変形量が得られるように
射出成形機の射出装置を制御し、ゲートシールされた後
は、射出成形用金型に生じた変形を元の状態に戻すよう
に逆圧装置を制御することを特徴とする射出成形方法。 2)射出成形機と射出成形用金型からなる射出成形装置
において、 前記射出成形用金型に設けられ、該射出成 形用金型に生じる変形量を検出する検出器と、射出成形
用金型に生じた変形を元の状態に 戻すように作用する逆圧装置と、 前記検出器による検出に基づいて、前記射 出成形機の射出装置および前記逆圧装置を制御する制御
部とを備えたことを特徴とする射出成形装置。
[Claims] 1) An injection mold is provided with a detector that detects the amount of deformation of the injection mold, and the deformation that occurs in the injection mold during injection molding is restored to its original state. A counter-pressure device is provided for returning the injection mold to a predetermined desired amount of deformation until the gate is sealed, based on the amount of deformation of the injection mold detected by the detector during injection molding. An injection molding method comprising: controlling an injection device of an injection molding machine so as to control the injection device of the injection molding machine, and controlling a counter pressure device so as to return the deformation caused in the injection mold to its original state after gate sealing. . 2) In an injection molding apparatus consisting of an injection molding machine and an injection mold, the detector is provided in the injection mold and detects the amount of deformation occurring in the injection mold; and a control unit that controls the injection device of the injection molding machine and the counterpressure device based on detection by the detector. An injection molding device featuring:
JP12868587A 1987-05-26 1987-05-26 Method and device for injection molding Pending JPS63293026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12868587A JPS63293026A (en) 1987-05-26 1987-05-26 Method and device for injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12868587A JPS63293026A (en) 1987-05-26 1987-05-26 Method and device for injection molding

Publications (1)

Publication Number Publication Date
JPS63293026A true JPS63293026A (en) 1988-11-30

Family

ID=14990894

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12868587A Pending JPS63293026A (en) 1987-05-26 1987-05-26 Method and device for injection molding

Country Status (1)

Country Link
JP (1) JPS63293026A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014041145A (en) * 2013-10-22 2014-03-06 Sumitomo Heavy Ind Ltd Injection molding machine
JP2017177737A (en) * 2016-03-31 2017-10-05 日精樹脂工業株式会社 Injection molding machine and method for molding the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014041145A (en) * 2013-10-22 2014-03-06 Sumitomo Heavy Ind Ltd Injection molding machine
JP2017177737A (en) * 2016-03-31 2017-10-05 日精樹脂工業株式会社 Injection molding machine and method for molding the same
CN107263833A (en) * 2016-03-31 2017-10-20 日精树脂工业株式会社 Injection moulding machine and its forming method

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