JPH0438569B2 - - Google Patents
Info
- Publication number
- JPH0438569B2 JPH0438569B2 JP59070965A JP7096584A JPH0438569B2 JP H0438569 B2 JPH0438569 B2 JP H0438569B2 JP 59070965 A JP59070965 A JP 59070965A JP 7096584 A JP7096584 A JP 7096584A JP H0438569 B2 JPH0438569 B2 JP H0438569B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- mold clamping
- injection
- mold
- screw
- 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 - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 5
- 238000000748 compression moulding Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 238000007906 compression Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
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
- B29C45/46—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
- B29C2045/563—Enlarging the mould cavity during injection
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
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応用できる射出圧縮成形
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an injection compression molding method that can be applied to an injection molding machine.
（従来技術）
第１図は従来の射出成形機の要部の側断面図を
示す。第１図において、型締シリンダ１に高圧油
を供給し、金型２を高圧で締めつけた状態で、予
めスクリユ３を回転させてホツパ４内の粒状樹脂
５（ペレツトと云う）を溶融し、Ａ部に貯えてお
いた樹脂を、射出シリンダ室Ｂに高圧油を供給し
てスクリユ３を前進させることにより、金型２内
に射出して所望の成形品を得る。この時金型を締
める圧力は常に一定である。(Prior Art) FIG. 1 shows a side sectional view of the main parts of a conventional injection molding machine. In FIG. 1, with high pressure oil supplied to the mold clamping cylinder 1 and the mold 2 clamped under high pressure, the screw 3 is rotated in advance to melt the granular resin 5 (referred to as pellets) in the hopper 4. The resin stored in section A is injected into the mold 2 by supplying high pressure oil to the injection cylinder chamber B and moving the screw 3 forward to obtain a desired molded product. At this time, the pressure that tightens the mold is always constant.
（発明が解決しようとする課題）
しかしながら第１図の装置において、薄い板状
の成形品や、粘性の高い樹脂を成形するような場
合には、成形品の内部応力の変化が大きく、そ
り、歪、割れ等の不具合を生ずる欠点があつた。
また狭いすき間を樹脂が通過する為、大きな型締
力と射出圧力を必要とする欠点があつた。(Problem to be Solved by the Invention) However, when using the apparatus shown in FIG. 1 to mold a thin plate-shaped molded product or a highly viscous resin, the internal stress of the molded product changes greatly, causing warpage and warpage. There were drawbacks that caused problems such as distortion and cracking.
Furthermore, since the resin passes through a narrow gap, a large mold clamping force and injection pressure are required.
本発明は前記従来の欠点を改善し、最近注目さ
れている高粘度のセラミツク射出成形や、薄物成
形品の成形を可能とする事を目的とするものであ
る。 The object of the present invention is to improve the above-mentioned conventional drawbacks and to enable injection molding of high-viscosity ceramics, which has recently attracted attention, and the molding of thin molded products.
（課題を解決するための手段）
このため本発明は、型締圧を射出のあるタイミ
ングから、低圧より高圧に制御する射出圧縮成形
方法において、型締低圧からら高圧への移行をス
クリユ位置を検出して行ない、かつ高圧型締時は
射出を圧力制御としてなるもので、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 method in which the mold clamping pressure is controlled from a low pressure to a high pressure from a certain timing of injection. This is done by detection, and during high-pressure mold clamping, injection is controlled by pressure, and this is a means to solve the problem.
（作用）
スクリユの位置信号により高圧型締に移行する
ため、成形品圧縮工程への移行が任意のタイミン
グで行なえる。また低圧型締時金型内に充填され
る樹脂の量が若干ばらついても、高圧型締時に吸
収され、成形品に影響が出ない。(Function) Since the system shifts to high-pressure mold clamping based on the screw position signal, it is possible to shift to the molded product compression process at any timing. Furthermore, even if there is slight variation in the amount of resin filled into the mold during low-pressure mold clamping, it is absorbed during high-pressure mold clamping and does not affect the molded product.
（実施例）
以下本発明の実施例を図面について説明する
と、第３図は本発明の実施例を示す。なお、第３
図において、前記第１図の従来構造と同一の部分
については、同じ符号を付し、その詳細な説明は
省略する。即ち、１は型締シリンダ、２は金型、
３はスクリユ、４はホツパ、５は粒状樹脂であ
る。(Example) An example of the present invention will be described below with reference to the drawings. FIG. 3 shows an example of the present invention. In addition, the third
In the figure, the same parts as those in the conventional structure shown in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted. That is, 1 is a mold clamping cylinder, 2 is a mold,
3 is a screw, 4 is a hopper, and 5 is a granular resin.
次に第１図と異なる点を説明すると、６はアキ
ユムレータで、油圧源であり、この油圧源より低
圧型締ラインＬと、高圧型締ラインＨに分岐され
る。ここで先ず低圧型締ラインＬについて説明す
ると、同ラインＬはソレノイドバルブ７、リリー
フ機能付減圧弁８、パイロツトチエツク弁９によ
り構成されている。そして減圧弁８により低圧型
締圧が設定される。またパイロツトチエツク弁９
は、高圧型締ラインＨのソレノイドバルブ１０に
よつて制御される。 Next, to explain the difference from FIG. 1, 6 is an accumulator, which is a hydraulic pressure source, and is branched from this hydraulic pressure source into a low-pressure mold clamping line L and a high-pressure mold clamping line H. First, the low pressure mold clamping line L will be explained. The line L is composed of a solenoid valve 7, a pressure reducing valve 8 with a relief function, and a pilot check valve 9. A low mold clamping pressure is then set by the pressure reducing valve 8. Also, pilot check valve 9
is controlled by a solenoid valve 10 in the high pressure mold clamping line H.
次に高圧型締ラインＨについて説明すると、同
ラインＨはソレノイドバルブ１０、減圧弁１１、
チエツク弁１２、流量制御弁１３で構成されてい
る。そして流量制御弁１３は、高圧型締時の型締
速度の制御に用いられる。次にスクリユ位置の検
出について説明すると、ロータリエンコーダ１４
が、スクリユ３と連結されており、同ロータリエ
ンコーダ１４によりスクリユ位置を検出する。 Next, to explain the high pressure mold clamping line H, the line H includes a solenoid valve 10, a pressure reducing valve 11,
It is composed of a check valve 12 and a flow control valve 13. The flow rate control valve 13 is used to control the mold clamping speed during high pressure mold clamping. Next, to explain the detection of the screw position, the rotary encoder 14
is connected to the screw 3, and the screw position is detected by the rotary encoder 14.
次に以上の如く構成された実施例について作用
を説明する。ソレノイドバルブ７のソレノイド
ａ、ソレノイドバルブ１０のソレノイドｂが励磁
されると、低圧型締ラインＬから圧油が型締シリ
ンダ１に供給され、減圧弁８の設定で低圧型締さ
れる。 Next, the operation of the embodiment configured as above will be explained. When the solenoid a of the solenoid valve 7 and the solenoid b of the solenoid valve 10 are energized, pressure oil is supplied from the low-pressure mold clamping line L to the mold clamping cylinder 1, and low-pressure mold clamping is performed by setting the pressure reducing valve 8.
次にスクリユ３の前進で、樹脂で金型２内に充
填（射出）されると、射出圧に負けて金型２は若
干開く。この時パイロツトチエツク弁９は、ソレ
ノイドバルブ１０により開いており、金型が開く
為、低圧型締ラインＬより戻る油は、減圧弁８よ
りリリーフする。即ち、減圧弁８はリリーフ機能
を有する減圧弁である。 Next, as the screw 3 advances, resin is filled (injected) into the mold 2, and the mold 2 opens slightly due to the injection pressure. At this time, the pilot check valve 9 is opened by the solenoid valve 10, and since the mold is opened, the oil returning from the low pressure mold clamping line L is relieved from the pressure reducing valve 8. That is, the pressure reducing valve 8 is a pressure reducing valve having a relief function.
次に成形品重量より若干大きめの充填量に相当
するスクリユストローク（予め設定されている）
に達したら、ソレノイドバルブ１０のソレノイド
ｃをオンにし、ソレノイドｂをオフにすると共
に、射出を圧力制御に切替える。これによりパイ
ロツトチエツク弁９は閉じ、同時に高圧型締ライ
ンＨより圧油が供給され、減圧弁１１の設定で高
圧型締される。この時の型締速度は、流量制御弁
１３で調整される。 Next, the screw stroke (preset) corresponds to a filling amount slightly larger than the weight of the molded product.
When the temperature reaches , the solenoid c of the solenoid valve 10 is turned on, the solenoid b is turned off, and the injection is switched to pressure control. As a result, the pilot check valve 9 is closed, and at the same time, pressure oil is supplied from the high-pressure mold clamping line H, and high-pressure mold clamping is performed by setting the pressure reducing valve 11. The mold clamping speed at this time is adjusted by the flow control valve 13.
またスクリユ３の位置検出は、ロータリエンコ
ーダ１４にて行なうが、リミツトスイツチ、ポテ
ンシヨメータ、リニアエンコーダ等によつても行
なう事ができ、更にアキユムレータ６の代りに油
圧ポンプを使用してもよい。 Further, the position of the screw 3 is detected by the rotary encoder 14, but it can also be done by a limit switch, potentiometer, linear encoder, etc. Furthermore, a hydraulic pump may be used in place of the accumulator 6.
（発明の効果）
以上詳細に説明した如く本発明は、型締低圧か
ら高圧への移行をスクリユ位置を検出して行なう
ようにしたため、成形品圧縮工程への移行が任意
のタイミングで行なえる。(Effects of the Invention) As described in detail above, in the present invention, the transition from low mold clamping pressure to high pressure is performed by detecting the screw position, so that the transition to the molded product compression step can be performed at any timing.
本発明はまた高圧型締への移行に伴い射出を圧
力制御としており、第２図に示す如く金型からの
圧縮力Fcと、スクリユよりの圧縮力Fscがバラン
スして圧縮していく為、成形品内部応力の変化が
小さく、そり、歪、割れ等が改善できる。従つて
低圧型締時金型内に楔填される樹脂の量が若干ば
らついても、高圧型締時に吸収され、成形品には
影響が出ない。なお、圧縮速度を流量制御弁で自
由に調整できるようにすれば、樹脂の冷却速度に
対応した成形が可能となり、成形品のそり、歪を
任意にコントロールできる。 The present invention also uses pressure control for injection in conjunction with the shift to high-pressure mold clamping, and as shown in Figure 2, the compression force Fc from the mold and the compression force Fsc from the screw are balanced and compressed. Changes in the internal stress of the molded product are small, and warpage, distortion, cracking, etc. can be improved. Therefore, even if there is slight variation in the amount of resin wedged into the mold during low-pressure mold clamping, it will be absorbed during high-pressure mold clamping, and the molded product will not be affected. Note that if the compression speed can be freely adjusted using a flow control valve, molding that corresponds to the cooling rate of the resin becomes possible, and warpage and distortion of the molded product can be controlled as desired.
第１図は従来の射出成形機の側断面図、第２図
は樹脂を金型とスクリユにより圧縮する力がバラ
ンスする状態を示す説明図、第３図は本発明の実
施例を示す射出圧縮成形方法を実施する装置のシ
ステム図である。
図の主要部分の説明、１……型締シリンダ、２
……金型、３……スクリユ、６……アキユムレー
タ、７，１０……ソレノイドバルブ、８……リリ
ーフ機能付減圧弁、１１……減圧弁、１３……流
量制御弁、Ｌ……低圧型締ライン、Ｈ……高圧型
締ライン。
Fig. 1 is a side sectional view of a conventional injection molding machine, Fig. 2 is an explanatory diagram showing a state in which the forces compressing resin by the mold and the screw are balanced, and Fig. 3 is an injection compression showing an embodiment of the present invention. FIG. 2 is a system diagram of an apparatus for carrying out a molding method. Explanation of the main parts of the figure, 1... mold clamping cylinder, 2
... Mold, 3 ... Screw, 6 ... Accumulator, 7, 10 ... Solenoid valve, 8 ... Pressure reducing valve with relief function, 11 ... Pressure reducing valve, 13 ... Flow rate control valve, L ... Low pressure type Clamping line, H...High pressure mold clamping line.
Claims (1)
り高圧に制御する射出圧縮成形方法において、型
締低圧から高圧への移行をスクリユ位置を検出し
て行ない、かつ高圧型締時は射出を圧力制御とし
たことを特徴とする射出圧縮成形方法。1 In an injection compression molding method in which mold clamping pressure is controlled from low pressure to high pressure from the timing of injection, the transition from low mold clamping pressure to high pressure is performed by detecting the screw position, and during high pressure mold clamping, injection is pressure controlled. An injection compression molding method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7096584A JPS60242028A (en) | 1984-04-11 | 1984-04-11 | Injection compression molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7096584A JPS60242028A (en) | 1984-04-11 | 1984-04-11 | Injection compression molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60242028A JPS60242028A (en) | 1985-12-02 |
| JPH0438569B2 true JPH0438569B2 (en) | 1992-06-24 |
Family
ID=13446736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7096584A Granted JPS60242028A (en) | 1984-04-11 | 1984-04-11 | Injection compression molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60242028A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2515506B2 (en) * | 1986-08-13 | 1996-07-10 | 東芝機械株式会社 | Mold clamping control method for injection compression molding machine |
| JPS6394807A (en) * | 1986-10-09 | 1988-04-25 | Toshiba Mach Co Ltd | Injection compression molding |
| JPH01241420A (en) * | 1988-03-24 | 1989-09-26 | Komatsu Ltd | Molding process and molding device of injection compression molding machine |
| JP2510441B2 (en) * | 1990-11-08 | 1996-06-26 | 株式会社クラレ | Injection molding method for synthetic resin moldings |
| US6109910A (en) * | 1997-04-02 | 2000-08-29 | Tohkai Juken Kogyo Kabushiki Kaisha | Injection molding machine for thermoplastic resin |
| KR100322860B1 (en) * | 1997-04-09 | 2002-07-08 | 노리쓰기 세끼도 | Injection molding machine for thermoplastic resin |
| JP2015214056A (en) * | 2014-05-09 | 2015-12-03 | 三菱電線工業株式会社 | Method and apparatus for injection molding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4872259A (en) * | 1971-12-29 | 1973-09-29 | ||
| JPS5214657A (en) * | 1975-07-25 | 1977-02-03 | Matsuda Seisakusho | Injection compressive molding method adapted to mold multiple thin products mainly by picking up them |
| JPS5692036A (en) * | 1979-12-27 | 1981-07-25 | Hitachi Ltd | Injection molder |
| JPS56121748A (en) * | 1980-02-29 | 1981-09-24 | Nissei Plastics Ind Co | Injection molding method |
| JPS5759060A (en) * | 1980-09-27 | 1982-04-09 | Toyota Motor Corp | Ignition timing controlling method of internal combustion engine |
-
1984
- 1984-04-11 JP JP7096584A patent/JPS60242028A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4872259A (en) * | 1971-12-29 | 1973-09-29 | ||
| JPS5214657A (en) * | 1975-07-25 | 1977-02-03 | Matsuda Seisakusho | Injection compressive molding method adapted to mold multiple thin products mainly by picking up them |
| JPS5692036A (en) * | 1979-12-27 | 1981-07-25 | Hitachi Ltd | Injection molder |
| JPS56121748A (en) * | 1980-02-29 | 1981-09-24 | Nissei Plastics Ind Co | Injection molding method |
| JPS5759060A (en) * | 1980-09-27 | 1982-04-09 | Toyota Motor Corp | Ignition timing controlling method of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60242028A (en) | 1985-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |