JPS6290215A - Injection molding machine - Google Patents
Injection molding machineInfo
- Publication number
- JPS6290215A JPS6290215A JP22859185A JP22859185A JPS6290215A JP S6290215 A JPS6290215 A JP S6290215A JP 22859185 A JP22859185 A JP 22859185A JP 22859185 A JP22859185 A JP 22859185A JP S6290215 A JPS6290215 A JP S6290215A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- injection
- piston
- speed
- injection molding
- 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
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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は射出成形機に関し、特に射出成形キャビティの
圧力を制御する圧力制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding machine, and more particularly to a pressure control device for controlling the pressure in an injection molding cavity.
（従来の技術）
射出成形機では、固定金型て対して可動金型を移動させ
て、型閉した後、固定金型と可動金型とによって成形さ
れる射出成形用キャビティ内に射出シリンダからグラス
チック（樹脂）が射出制御されて注入される。そして、
このプラスチックは射出成形キャビティ内で所定の形状
に成形された後、型開して取り出される。(Prior art) In an injection molding machine, a movable mold is moved relative to a fixed mold, and after the mold is closed, an injection cylinder is inserted into an injection molding cavity formed by the fixed mold and the movable mold. Glasstic (resin) is injected under injection control. and,
This plastic is molded into a predetermined shape within an injection molding cavity, and then the mold is opened and removed.
（発明が解決しようとする問題点）
ところで、射出成形機でプラスチックを射出成形する場
合、射出成形キャビティにプラスチックが完全に充填さ
れ、これによって、プラスチックの流れが停止させられ
ると、射出による慣性を有しているプラスチックの流れ
が急に停止することになるから、第４図に示すように射
出成形キャビティ内の圧力が急激に変化する。その結果
、成形品の外観２寸法精度、及び強度が悪くなるという
問題点がある。(Problem to be Solved by the Invention) By the way, when plastic is injection molded using an injection molding machine, if the injection molding cavity is completely filled with plastic and the flow of plastic is stopped, the inertia due to injection is reduced. Since the flow of the plastic contained therein will suddenly stop, the pressure within the injection molding cavity will change rapidly, as shown in FIG. As a result, there is a problem in that the external dimensional accuracy and strength of the molded product deteriorate.
発明の目的は外観２寸法精度、及び強度が良好な成形品
を得ることのできる射出成形機を提供することにある。An object of the invention is to provide an injection molding machine that can produce molded products with good two-dimensional accuracy in appearance and strength.
（問題点を解決するための手段）
本発明は固定金型と、この固定金型に対して進退自在に
設けられ、固定金型とともにキャビティを形成する移動
金型と、キャビティに樹脂を射出するための射出手段と
を備えた射出成形機において、キャビティの容量を変化
させるためのキャビティ容量調整手段と、キャビティの
圧力を検知する圧力検知手段と、キャビティ容量調整手
段及び射出手段を制御する制御手段とを有し、この制御
手段は圧力検知手段で検知されたキャビティ圧力に基づ
いてキャビティ容量調整手段による射出成形キャビティ
容量調整及び前記射出手段の射出速度を制御するように
したことを特徴とする射出成形機である。(Means for Solving the Problems) The present invention includes a fixed mold, a movable mold that is movable forward and backward relative to the fixed mold and forms a cavity together with the fixed mold, and a method for injecting resin into the cavity. In an injection molding machine, the injection molding machine is equipped with an injection means for changing the capacity of the cavity, a pressure detection means for detecting the pressure in the cavity, and a control means for controlling the cavity capacity adjustment means and the injection means. and the control means controls the injection molding cavity capacity adjustment by the cavity capacity adjustment means and the injection speed of the injection means based on the cavity pressure detected by the pressure detection means. It is a molding machine.
（実施例） 以下本発明について実施例によって説明する。(Example) The present invention will be explained below with reference to Examples.
第１図を参照して、固定金型１に対して進退自在に可動
金型２と可動金型２′が配設されており。Referring to FIG. 1, a movable mold 2 and a movable mold 2' are arranged so as to be movable forward and backward relative to a fixed mold 1.
この可動金型２，２′は相対的に移動可能となっている
。また固定金型１の中央部にはプラスチックを注入（射
出）するためのスプール３が形成されている。このスプ
ール３は固定金型１と可動金型２とによって形成される
射出成形用のキャビティ（第１のキャビティ）４に連通
している。スプール３には射出シリンダ５が連結されて
おり、この射出シリンダ５内のピストン６は射出用アク
チュエータ７に連結されている。そして、この射出シリ
ンダ５から射出成形用のキャビティ（第１のキャビティ
）４にプラスチックが注入される。The movable molds 2, 2' are relatively movable. Further, a spool 3 for injecting (injecting) plastic is formed in the center of the fixed mold 1. This spool 3 communicates with an injection molding cavity (first cavity) 4 formed by a fixed mold 1 and a movable mold 2. An injection cylinder 5 is connected to the spool 3, and a piston 6 within the injection cylinder 5 is connected to an injection actuator 7. Then, plastic is injected from the injection cylinder 5 into the injection molding cavity (first cavity) 4.
可動金型２′には連通孔を介して射出成形用のキャビテ
ィ（第１のキャビティ）４と連通ずるチャンバ（第２の
キャビティ）８が形成されている。A chamber (second cavity) 8 is formed in the movable mold 2' and communicates with an injection molding cavity (first cavity) 4 through a communication hole.
可動金型２′内には圧力センサ９が配設されており。A pressure sensor 9 is disposed within the movable mold 2'.
この圧力センサ９の圧力検出端９ａ、９ｂ、及び９Ｃは
チャ／・ぐ（第２のキャビティ）８の壁面に達シている
。チャンバ（第２のキャビティ）８には図示のようにチ
ャ／パ８内で滑励可能にピストン１０が配設されており
、このピストン１０はキャビティ容量調節装置１１に連
結されている。前述の圧カセノサ９は制御装置１２に接
続されており、この制御装置１，２によってキャビティ
容量調節装置１１及び射出用アクチュエータ７が制御さ
れる。Pressure detection ends 9a, 9b, and 9C of this pressure sensor 9 reach the wall surface of the chamber (second cavity) 8. As shown in the figure, a piston 10 is disposed in the chamber (second cavity) 8 so as to be slidable within the chamber 8, and this piston 10 is connected to a cavity volume adjustment device 11. The pressure chamber 9 described above is connected to a control device 12, and the cavity capacity adjustment device 11 and the injection actuator 7 are controlled by the control devices 1 and 2.
次に上述した射出成形機の動作について、第１図、及び
第２図（、）〜（ｄ）を手照して説明する。Next, the operation of the injection molding machine described above will be explained with reference to FIG. 1 and FIGS. 2(a) to (d).
射出成形を行う場合、まず、固定金型１と可動金型２及
び可動金型２′とを型閉めする。型閉めが終了すると、
制御装置１２からの指令により射出用アクチュエータ７
が制御され、射出用アクチュエータフによってピストン
６が左方向へ駆動し。When performing injection molding, first, the fixed mold 1, the movable mold 2, and the movable mold 2' are closed. Once the mold is closed,
The injection actuator 7 is activated by a command from the control device 12.
is controlled, and the piston 6 is driven to the left by the injection actuator tough.
射出用シリンダ５からプラスチックがスプール３を通っ
て第１のキャビティ４に注入されていく（第２図（ａ）
）。Plastic is injected from the injection cylinder 5 through the spool 3 into the first cavity 4 (Fig. 2(a)).
).
プラスチックが第１のキャビティ４に注入されると、Ｐ
口ち、第１のキャビティ４の容量に相当する量のプラス
チックが注入されると、制御装置１２はキャビティ容量
調整装置１１に駆動信号を送出するとともに射出用アク
チュエータ７に速度制御信号を送る。キャビティ容量調
整装置１１は駆動信号を受けると、ピストン１０を左方
向へ移動させる。また、射出用アクチュエータ７はピス
トン６の速度を徐々に減速させる（第２図（ｂ））。When the plastic is injected into the first cavity 4, P
Finally, when an amount of plastic corresponding to the capacity of the first cavity 4 is injected, the control device 12 sends a drive signal to the cavity capacity adjustment device 11 and also sends a speed control signal to the injection actuator 7. When receiving the drive signal, the cavity capacity adjustment device 11 moves the piston 10 to the left. Further, the injection actuator 7 gradually reduces the speed of the piston 6 (FIG. 2(b)).
制御装置１２には樹脂圧力の目標値が入力されており、
圧力センサ９で検出された樹脂圧力と上即ち、ピストン
１０及び６の速度が減速制御される（第２図（Ｃ））。A target value of resin pressure is input to the control device 12,
The resin pressure detected by the pressure sensor 9 and the speeds of the pistons 10 and 6 are controlled to be decelerated (FIG. 2(C)).
御し、その結果ピストン６の速度は零となる。この時、
制御装置１２はキャビティ容量調整装置１１によってピ
スト／１０の速度を零とする（第２図（ｄ） ）、 ＋
１
上述のように第１のキャビティに樹脂を充填した後、キ
ャビティ容量調節装置及び射出用アクチュエータをそれ
ぞれ制御して実質的に固定金型１と可動金型２及び可動
金型２′とによって形成される千ヤビティを徐々に拡張
するとともに、樹脂の射出速度を徐々に減速しているか
ら、従来、樹脂充填完了時に生じた急激な局部的圧力変
動が生じることがない。即ち、第３図に示すように第１
のキャビティに樹脂を充填した後の樹脂圧力の変動がな
めらかになる。As a result, the speed of the piston 6 becomes zero. At this time,
The control device 12 makes the speed of the piston/10 zero by the cavity capacity adjustment device 11 (FIG. 2(d)), +
1 After filling the first cavity with resin as described above, the cavity capacity adjustment device and the injection actuator are controlled respectively to form the mold substantially by the fixed mold 1, the movable mold 2, and the movable mold 2'. Since the injection speed is gradually expanded and the resin injection speed is gradually reduced, sudden local pressure fluctuations that conventionally occur when resin filling is completed do not occur. That is, as shown in FIG.
Fluctuations in resin pressure after filling the cavity with resin become smoother.
なお、成形品として必要とする部分は第１のキャビティ
で射出成形された部分であるので、第２のキャビティの
部分は切り落として、成形品とする。Note that since the part required as a molded product is the part injection-molded in the first cavity, the second cavity part is cut off to obtain the molded product.
（発明の効果）
以上説明したように本発明の射出成形機によれば、キャ
ビティ内圧力に基づいて、キャビティ容量を調節すると
ともに射出シリンダからの射出速度を制御するようにし
たから、キャビティ内圧力が急激に変化することがない
。従って、外観２寸法精度、及び強度のすぐれた成形品
を得ることができる。(Effects of the Invention) As explained above, according to the injection molding machine of the present invention, the cavity capacity is adjusted based on the cavity internal pressure and the injection speed from the injection cylinder is controlled. does not change rapidly. Therefore, a molded product with excellent two-dimensional accuracy in appearance and strength can be obtained.
第１図は本発明による射出成形機の一実施例を概略的に
示す図、第２図（、）〜（ｄ）はキャビティ容量の調整
を説明するための図、第３図は本発明の射出成形機によ
るキャビティ樹脂圧力を示す図、第４図は従来の射出成
形機によるキャビティ樹脂圧力を示す図である。
１・・・固定、金型、 ２ 、２’・・・可動金型、３
・・・スプール、４・・・射出成形キャビティ（第１の
キャビティ）。
５・・・射出シリンダ、６・・・ピストン、７・・・射
出用アクチュエータ、８・・・チャンノぐ（第２のキャ
ビティ）。
９・・・圧力センサ、１０・・・ピストン、１１・・・
キャビティ容量調節装置、１２・・・制御装置。FIG. 1 is a diagram schematically showing an embodiment of an injection molding machine according to the present invention, FIGS. 2(a) to (d) are diagrams for explaining the adjustment of cavity capacity, and FIG. FIG. 4 is a diagram showing cavity resin pressure by an injection molding machine. FIG. 4 is a diagram showing cavity resin pressure by a conventional injection molding machine. 1...Fixed, mold, 2, 2'...Movable mold, 3
... Spool, 4... Injection molding cavity (first cavity). 5... Injection cylinder, 6... Piston, 7... Injection actuator, 8... Channel (second cavity). 9...Pressure sensor, 10...Piston, 11...
Cavity capacity adjustment device, 12...control device.
Claims (1)
れ、前記固定金型とともにキャビティを形成する移動金
型と、キャビティに樹脂を射出するための射出手段とを
備えた射出成形機において、前記キャビティの容量を変
化させるためのキャビティ容量調整手段と、該キャビテ
ィの圧力を検知する圧力検知手段と、前記キャビティ容
量調整手段及び前記射出手段を制御する制御手段とを有
し、該制御手段は前記圧力検知手段で検知されたキャビ
ティ圧力に基づいて前記キャビティ容量調整手段による
キャビティ容量調整及び前記射出手段の射出速度を制御
するようにしたことを特徴とする射出成形機。1. An injection molding machine comprising a fixed mold, a movable mold that is movable forward and backward relative to the fixed mold and forms a cavity together with the fixed mold, and injection means for injecting resin into the cavity. , comprising a cavity capacity adjustment means for changing the capacity of the cavity, a pressure detection means for detecting the pressure in the cavity, and a control means for controlling the cavity capacity adjustment means and the injection means, and the control means for controlling the cavity capacity adjustment means and the injection means. An injection molding machine characterized in that the means controls the cavity capacity adjustment by the cavity capacity adjustment means and the injection speed of the injection means based on the cavity pressure detected by the pressure detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22859185A JPS6290215A (en) | 1985-10-16 | 1985-10-16 | Injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22859185A JPS6290215A (en) | 1985-10-16 | 1985-10-16 | Injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6290215A true JPS6290215A (en) | 1987-04-24 |
| JPH0158056B2 JPH0158056B2 (en) | 1989-12-08 |
Family
ID=16878758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22859185A Granted JPS6290215A (en) | 1985-10-16 | 1985-10-16 | Injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6290215A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06106592A (en) * | 1991-12-17 | 1994-04-19 | Nissei Plastics Ind Co | Method and apparatus for controlling molding machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5214658A (en) * | 1975-05-29 | 1977-02-03 | Hisashi Kojima | Method and device for controlling internal pressure in injection molding machine mold |
| JPS5699644A (en) * | 1979-12-29 | 1981-08-11 | Pentel Kk | Controlling method for injection molding machine |
| JPS56106837A (en) * | 1980-01-31 | 1981-08-25 | Pentel Kk | Method and apparatus for injection molding |
| JPS58201627A (en) * | 1982-05-20 | 1983-11-24 | Niigata Eng Co Ltd | Reactive injection molding method |
| JPS59185638A (en) * | 1983-04-07 | 1984-10-22 | Mitsubishi Heavy Ind Ltd | Feedback control method by nozzle resin pressure |
| JPS6056506A (en) * | 1983-09-09 | 1985-04-02 | 株式会社豊田中央研究所 | Injection molding method and device |
-
1985
- 1985-10-16 JP JP22859185A patent/JPS6290215A/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5214658A (en) * | 1975-05-29 | 1977-02-03 | Hisashi Kojima | Method and device for controlling internal pressure in injection molding machine mold |
| JPS5699644A (en) * | 1979-12-29 | 1981-08-11 | Pentel Kk | Controlling method for injection molding machine |
| JPS56106837A (en) * | 1980-01-31 | 1981-08-25 | Pentel Kk | Method and apparatus for injection molding |
| JPS58201627A (en) * | 1982-05-20 | 1983-11-24 | Niigata Eng Co Ltd | Reactive injection molding method |
| JPS59185638A (en) * | 1983-04-07 | 1984-10-22 | Mitsubishi Heavy Ind Ltd | Feedback control method by nozzle resin pressure |
| JPS6056506A (en) * | 1983-09-09 | 1985-04-02 | 株式会社豊田中央研究所 | Injection molding method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06106592A (en) * | 1991-12-17 | 1994-04-19 | Nissei Plastics Ind Co | Method and apparatus for controlling molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0158056B2 (en) | 1989-12-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |