JP2622298B2 - In-mold pressure control method for injection compression molding machine - Google Patents
In-mold pressure control method for injection compression molding machineInfo
- Publication number
- JP2622298B2 JP2622298B2 JP2052921A JP5292190A JP2622298B2 JP 2622298 B2 JP2622298 B2 JP 2622298B2 JP 2052921 A JP2052921 A JP 2052921A JP 5292190 A JP5292190 A JP 5292190A JP 2622298 B2 JP2622298 B2 JP 2622298B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- pressure
- injection
- molding machine
- compression 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.)
- Expired - Fee Related
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
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/231—Needle valve systems therefor
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/567—Expelling resin through the gate
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は射出圧縮成形機の型内圧制御方法に関するも
のである。Description: TECHNICAL FIELD The present invention relates to a method for controlling an in-mold pressure of an injection compression molding machine.
（従来の技術） 射出圧縮成形において、金型キャビティ内圧を制御す
る手段として、射出装置の射出圧力を制御することが従
来から行われていた。第５図に従来の射出圧縮成形のシ
ーケンスを、第６図に代表的な射出圧縮成形機の構造を
示す。(Prior Art) In injection compression molding, control of the injection pressure of an injection device has conventionally been performed as means for controlling the mold cavity internal pressure. FIG. 5 shows a conventional injection compression molding sequence, and FIG. 6 shows the structure of a typical injection compression molding machine.
第６図において、可動型盤１及び固定型盤２は、コア
型３及びキャビティ型４を夫々固定する型盤で、図示し
ない手段によってコア型３を図中矢印の方向に移動させ
ることにより開閉される。またスクリュ６はスクンルシ
リンダ11に挿入されていて、図示しない手段により矢印
D3方向に回転され、空間Ｂに溶融樹脂を所定量蓄える。In FIG. 6, a movable mold plate 1 and a fixed mold plate 2 are mold plates for fixing the core mold 3 and the cavity mold 4, respectively, and are opened and closed by moving the core mold 3 in the direction of the arrow in the figure by means not shown. Is done. The screw 6 is inserted into the squel cylinder 11, and is moved by an arrow (not shown).
D is rotated in the 3 direction to store a predetermined amount of molten resin in the space B.
射出ラム７は射出シリンダ８の油室Ｃの圧油により射
出圧力及び背圧を制御し、油室Ｃにポンプ９から供給さ
れる圧油は、圧力弁10で圧力制御されている。スクリュ
シリンダ11内先端の空間Ｂの樹脂を、ノズル５からコア
型３とキャビティ型４とにより構成される型内空間Ａ内
に充填することを射出工程と称するが、射出シリンダ８
の油室Ｃ部の圧力は一般に70〜140kgf/cm2の値に達す
る。この力でスクリュ６は矢印D1方向に進み、射出が出
来る。またスクリュ６を矢印D3方向に回転して、空間Ｂ
に樹脂を蓄える時は、油室Ｃ部の圧力は１〜10kgf/cm2
程度の低圧に制御される。The injection ram 7 controls the injection pressure and the back pressure by the pressure oil in the oil chamber C of the injection cylinder 8, and the pressure oil supplied from the pump 9 to the oil chamber C is pressure-controlled by the pressure valve 10. Filling the resin in the space B at the tip of the screw cylinder 11 from the nozzle 5 into the mold space A formed by the core mold 3 and the cavity mold 4 is called an injection step.
The pressure in the oil chamber C generally reaches a value of 70 to 140 kgf / cm 2 . Screw 6 This force moves in the arrow D 1 direction, the injection can be. Also by rotating the screw 6 in the arrow D 3 direction, the space B
When resin is stored in the oil chamber, the pressure in the oil chamber C is 1 to 10 kgf / cm 2
It is controlled to a low pressure.
次に射出圧縮成形のプロセスを説明する。 Next, the process of injection compression molding will be described.
先ず型内充填について説明すると、コア型３とキャビ
ティ型４により構成される型内空間Ａに充填される樹脂
を圧縮するため、コア型３とキャビティ型４との間に予
めギャップｅを持たせた状態で、図示しない手段で、コ
ア型３とキャビティ型４とはロックされている。この状
態で、空間Ｂの樹脂は、スクリュ６を矢印D1方向に前進
させることにより型内空間Ａに充填される。スクリュ６
は充電が終ると、射出シリンダ８の油室Ｃの油圧が圧力
弁10により制御される力で前進位置で保持される。First, the in-mold filling will be described. In order to compress the resin filled in the in-mold space A formed by the core mold 3 and the cavity mold 4, a gap e is previously provided between the core mold 3 and the cavity mold 4. In this state, the core mold 3 and the cavity mold 4 are locked by means not shown. In this state, the resin of the space B, is charged into the mold space A by advancing the screw 6 in the arrow D 1 direction. Screw 6
When charging is completed, the oil pressure in the oil chamber C of the injection cylinder 8 is held at the forward position by a force controlled by the pressure valve 10.
次にキャビティ圧縮について説明する。ここで充填が
完了すると、ギャップｅを無くすためにコア型３が前進
し、キャビティ型４と完全に接合される。またコア型３
の前進により型内空間Ａは小さくなり、内部の樹脂は圧
縮される。このため予め充填されていた樹脂は型内空間
Ａの隅々まで充満すると同時に、空間Ｂへも逆流しよう
とする。圧縮工程での型内空間Ａの内圧の経時変化は、
成形品の重量バラツキや、内部歪の大小に影響を与える
ので厳しく制御されなければならない。この圧力をコン
トロールするのはスクリュ６を保持しておく力、即ち射
出シリンダ８の油室Ｃの油圧になる。また圧縮工程の型
内圧を制御するには、一般に射出シリンダ８の油圧で、
70〜140kgf/cm2の圧力が必要である。Next, cavity compression will be described. Here, when the filling is completed, the core mold 3 advances to eliminate the gap e, and is completely joined to the cavity mold 4. Also core type 3
The space A in the mold is reduced by the advance of the resin, and the resin inside is compressed. For this reason, the resin which has been filled beforehand fills the corners of the space A in the mold, and at the same time, tends to flow back into the space B. The change with time of the internal pressure of the mold space A in the compression step is as follows:
Since it affects the weight variation of the molded product and the magnitude of the internal strain, it must be strictly controlled. This pressure is controlled by the force for holding the screw 6, that is, the oil pressure of the oil chamber C of the injection cylinder 8. In addition, in order to control the in-mold pressure in the compression step, generally, the hydraulic pressure of the injection cylinder 8
A pressure of 70-140 kgf / cm 2 is required.
次に可塑化について説明する。キャビティの圧縮が終
ると、スクリュ６は矢印D3方向に回転し、再度スクリュ
シリンダ11の先端空間Ｂに所定の量だけ樹脂を供給し乍
ら矢印D2方向へ後退する。この時シリンダ８の油室Ｃの
圧力は、一般に１〜10kgf/cm2程度に保たなければなら
ない。Next, plasticization will be described. The compression of the cavity is completed, the screw 6 is rotated in the arrow D 3 direction and back by a resin supplied to乍Ra arrow D 2 direction by a predetermined amount to the tip space B of the screw cylinder 11 again. At this time, the pressure in the oil chamber C of the cylinder 8 must be generally maintained at about 1 to 10 kgf / cm 2 .
（発明が解決しようとする課題） 前記従来の方法では、圧縮工程での型内圧制御は射出
シリンダ８で行うため、成形サイクルの短縮が出来ない
欠点があった。この理由は、第４図に示す様に射出工程
（型内充填）が完了すると、すぐに可塑化に移ろうとし
ても、油室Ｃの圧力が70〜140kgf/cm2と高いため、スク
リュ６は回転してもすぐに矢印D2方向へ後退することは
出来ず、従って空間Ｂに樹脂を蓄えることが出来ないた
めであった。(Problems to be Solved by the Invention) In the above-mentioned conventional method, since the control of the mold inner pressure in the compression step is performed by the injection cylinder 8, there is a disadvantage that the molding cycle cannot be shortened. The reason for this is that, as shown in FIG. 4, if the injection process (filling in the mold) is completed, the pressure in the oil chamber C is as high as 70 to 140 kgf / cm 2 even if plasticization is attempted immediately. It was to not be able to retreat immediately to the arrow D 2 direction to rotate, therefore it is impossible to store the resin in the space B.
本発明では、圧縮工程に必要な圧力制御を射出シリン
ダ８以外のもので行わせることにより、圧縮と可塑化を
同時動作とし、これによってサイクルの短縮を図ること
を目的とするものである。In the present invention, the pressure control required for the compression step is performed by means other than the injection cylinder 8 so that compression and plasticization are performed simultaneously, thereby shortening the cycle.
（課題を解決するための手段） このため本発明は、金型内に一旦注入された溶融樹脂
を、キャビティ容積を外力によって小さくすることによ
り圧縮し、所定の形状に成形する射出圧縮成形機の型内
圧制御方法において、射出装置のノズル部に樹脂流路の
シール力制御手段を有する開閉機構を設け、圧縮工程中
前記開閉機構の金型側から射出装置側への樹脂の流れに
抗する様に、前記開閉機構のシール力を任意の経時パタ
ーンで変化せしめることにより、金型内圧力を制御する
ようにしてなるもので、これを課題解決のための手段と
するものである。(Means for Solving the Problems) For this reason, the present invention provides an injection compression molding machine that compresses a molten resin once injected into a mold by reducing the cavity volume by an external force to form a predetermined shape. In the in-mold pressure control method, an opening / closing mechanism having a sealing force control means for a resin flow path is provided in a nozzle portion of an injection device so that a resin flow from a mold side of the opening / closing mechanism to a side of the injection device during a compression process is prevented. Further, the pressure in the mold is controlled by changing the sealing force of the opening / closing mechanism in an arbitrary pattern with time, and this is a means for solving the problem.
（作用） ノズルの代わりに設けた開閉バルブのシール力を射出
圧力とは別の油圧源からの油圧で制御することにより、
可塑化に必要な射出シリンダ内の圧力は、圧縮工程に必
要な圧力とは別に設定し得るので、前述の同時動作が可
能となる。従って圧縮工程の時間分だけサイクル短縮を
図ることができる。(Operation) By controlling the sealing force of the open / close valve provided in place of the nozzle by hydraulic pressure from a hydraulic pressure source different from the injection pressure,
Since the pressure in the injection cylinder required for plasticization can be set separately from the pressure required for the compression step, the above-described simultaneous operation can be performed. Therefore, the cycle can be shortened by the time of the compression step.
（実施例） 以下本発明を図面の実施例について説明すると、第１
図〜第４図は本発明の実施例を示す。なお、第１図にお
いて１は可動型盤、２は固定型盤、３はコア型、４はキ
ャビティ型、６はスクリュ、７は射出ラム、８は射出シ
リンダ、９はポンプ、10は圧力弁、11はスクリュシリン
ダ、12はヒータであり、これらは前記従来の第６図に示
すものと同一であるので、ここではこれらについての説
明は省略する。(Embodiments) The present invention will be described below with reference to the embodiments in the drawings.
FIG. 4 to FIG. 4 show an embodiment of the present invention. In FIG. 1, 1 is a movable mold board, 2 is a fixed mold board, 3 is a core mold, 4 is a cavity mold, 6 is a screw, 7 is an injection ram, 8 is an injection cylinder, 9 is a pump, and 10 is a pressure valve. , 11 are screw cylinders, and 12 is a heater. These are the same as those shown in FIG. 6 of the prior art, and therefore description thereof will be omitted here.
以下従来の第６図との相違点を説明すると、13は開閉
バルブであり、その詳細を第３図により説明すると、21
はピンで、プランジャ14を押すレバー15の回転中心であ
り、プランジャ14による型内空間Ａ部の樹脂圧力をシー
ルする力は、レバー15を反時計方向に回転する力、即ち
油圧シリンダ19のＥ部に加わる油圧源である油圧ポンプ
22と、その圧力弁20による油圧によって決まる。油圧シ
リンダ19のピストン18は、ロッド17によってナックル16
に繋がっており、ピストン18による力は、レバー15の回
転力を生じさせている。Hereinafter, the difference from the conventional FIG. 6 will be described. Reference numeral 13 denotes an opening / closing valve, the details of which are described with reference to FIG.
Is a rotation center of a lever 15 that pushes the plunger 14, and the force of the plunger 14 for sealing the resin pressure in the space A in the mold is a force for rotating the lever 15 counterclockwise, that is, the E of the hydraulic cylinder 19. Hydraulic pump that is a source of hydraulic pressure applied to the section
22 and the oil pressure by the pressure valve 20. The piston 18 of the hydraulic cylinder 19 is knuckle 16
, And the force of the piston 18 generates a rotational force of the lever 15.
第１図は従来の成形機に、第３図に示す開閉バルブ13
の機構を装着したもので、この動作は第４図に示すもの
となる。即ち、型内充填が完了してキャビティの圧縮が
開始されると同時に、可塑化も開始されるが、この時開
閉バルブ13のシール圧は、第２図に示す如く、成形品に
よって定まる最適な経時パターンで、第３図の油圧シリ
ンダ19E部の液圧を圧力弁20でコントロールすることに
より決められる。即ち、型内空間Ａの樹脂は、コア型３
の前進により型内空間Ａが小さくなるにつれて圧縮され
るが、この圧力がキャビティ型４に当接している開閉バ
ルブ13のシール圧力より高くなろうとすると、開閉バル
ブ13のプランジャ14が後退し、樹脂がスクリュシリンダ
11の先端部空間Ｂに逆流することにより、上述の最適パ
ターンでコントロールされる。FIG. 1 shows a conventional molding machine and an open / close valve 13 shown in FIG.
This operation is as shown in FIG. That is, at the same time as the filling of the mold is completed and the compression of the cavity is started, the plasticization is also started. At this time, as shown in FIG. The hydraulic pressure in the hydraulic cylinder 19E shown in FIG. That is, the resin in the mold space A is the core mold 3
As the space A in the mold becomes smaller due to the forward movement of the mold, if the pressure tries to become higher than the sealing pressure of the on-off valve 13 in contact with the cavity mold 4, the plunger 14 of the on-off valve 13 retreats and the resin Is a screw cylinder
By flowing back into the front end space B of the eleventh portion, it is controlled in the above-mentioned optimum pattern.
（発明の効果） 以上詳細に説明した如く本発明は構成されているで、
本発明の第４図に示す成形工程は、第５図は示す従来の
射出圧縮成形時の動作工程と比較して明らかな様に、従
来は可塑化工程がキャビティ圧縮の工程の完了するまで
は開始出来なかったが、本発明方法では圧縮工程と同時
にスタートすることが出来る。従って圧縮工程の時間分
だけサイクルの短縮を図ることができ、第８図に示す本
発明と従来との成形サイクル工程の比較図からも明らか
なように、本発明によるとサイクルの短縮が図られるこ
とが分る。(Effects of the Invention) The present invention is configured as described in detail above.
In the molding process shown in FIG. 4 of the present invention, as is apparent from the comparison with the conventional operation process at the time of injection compression molding shown in FIG. 5, the conventional plasticizing process is performed until the cavity compression process is completed. Although it could not be started, the method of the present invention can be started at the same time as the compression step. Therefore, the cycle can be shortened by the time of the compression step. As is clear from the comparison between the present invention and the conventional molding cycle shown in FIG. 8, the cycle can be shortened according to the present invention. I understand.
第１図は本発明の方法を実施する射出圧縮成形機の断面
図、第２図は圧縮成形工程における型内圧パターンを示
す説明図、第３図は第１図におけるノズル部の詳細構造
を示す断面図、第４図は本発明による成形工程図、第５
図は従来方法による成形工程図、第６図は従来の成形機
を示す断面図、第７図は第６図におけるノズル部の詳細
断面図、第８図は従来と本発明とのサイクル工程比較図
である。 図の主要部分の説明 １……可動型盤 ２……固定型盤 ３……コア型 ４……キャビティ型 ６……スクリュ 13……開閉バルブ 14……プランジャ 19……油圧シリンダ 20……圧力弁 23……コントローラFIG. 1 is a cross-sectional view of an injection compression molding machine for carrying out the method of the present invention, FIG. 2 is an explanatory view showing an in-mold pressure pattern in a compression molding step, and FIG. 3 shows a detailed structure of a nozzle portion in FIG. FIG. 4 is a sectional view of a molding process according to the present invention, and FIG.
Fig. 6 is a molding process diagram by the conventional method, Fig. 6 is a sectional view showing a conventional molding machine, Fig. 7 is a detailed sectional view of the nozzle portion in Fig. 6, and Fig. 8 is a cycle process comparison between the conventional and the present invention. FIG. Explanation of main parts in the drawing 1 ... movable mold board 2 ... fixed mold board 3 ... core mold 4 ... cavity mold 6 ... screw 13 ... opening / closing valve 14 ... plunger 19 ... hydraulic cylinder 20 ... pressure Valve 23: Controller
Claims (1)
ビティ容積を外力によって小さくすることにより圧縮
し、所定の形状に成形する射出圧縮成形機の型内圧制御
方法において、射出装置のノズル部に樹脂流路のシール
力制御手段を有する開閉機構を設け、圧縮工程中前記開
閉機構の金型側から射出装置側への樹脂の流れに抗する
様に、前記開閉機構のシール力を任意の経時パターンで
変化せしめることにより、金型内圧力を制御することを
特徴とする射出圧縮成形機の型内圧制御方法。In a method for controlling an internal pressure of an injection compression molding machine, a molten resin once injected into a mold is compressed by reducing a cavity volume by an external force and molded into a predetermined shape. An opening / closing mechanism having means for controlling the sealing force of the resin flow path is provided in the section, and the sealing force of the opening / closing mechanism is optionally set so as to resist the flow of resin from the mold side to the injection device side of the opening / closing mechanism during the compression process. A method for controlling the pressure in a mold of an injection compression molding machine, wherein the pressure in the mold is controlled by changing the pressure in a time-dependent pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2052921A JP2622298B2 (en) | 1990-03-02 | 1990-03-02 | In-mold pressure control method for injection compression molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2052921A JP2622298B2 (en) | 1990-03-02 | 1990-03-02 | In-mold pressure control method for injection compression molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03253318A JPH03253318A (en) | 1991-11-12 |
| JP2622298B2 true JP2622298B2 (en) | 1997-06-18 |
Family
ID=12928298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2052921A Expired - Fee Related JP2622298B2 (en) | 1990-03-02 | 1990-03-02 | In-mold pressure control method for injection compression molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2622298B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464753A (en) * | 2013-08-26 | 2013-12-25 | 苏州米莫金属科技有限公司 | Self-locking-type nozzle for injection moulding machine |
-
1990
- 1990-03-02 JP JP2052921A patent/JP2622298B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03253318A (en) | 1991-11-12 |
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