JPS60242028A - Injection compression molding method - Google Patents

Injection compression molding method

Info

Publication number
JPS60242028A
JPS60242028A JP7096584A JP7096584A JPS60242028A JP S60242028 A JPS60242028 A JP S60242028A JP 7096584 A JP7096584 A JP 7096584A JP 7096584 A JP7096584 A JP 7096584A JP S60242028 A JPS60242028 A JP S60242028A
Authority
JP
Japan
Prior art keywords
pressure
mold clamping
mold
screw
low
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
Application number
JP7096584A
Other languages
Japanese (ja)
Other versions
JPH0438569B2 (en
Inventor
Hajime Hamada
源 浜田
Shigetaka Shioda
塩田　重隆
Shuji Adachi
修二 足立
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP7096584A priority Critical patent/JPS60242028A/en
Publication of JPS60242028A publication Critical patent/JPS60242028A/en
Publication of JPH0438569B2 publication Critical patent/JPH0438569B2/ja
Granted 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
    • B29C45/46—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)

Abstract

PURPOSE:To mold an article with less internal stress, by a method wherein the function of relieving a return oil at the time of low-pressure mold clamping is provided, a command for high-pressure mold clamping is given at a poosition of a screw, the high-pressure mold clamping speed can be controlled, and injection pressure is controlled at the time of high-pressure mold clamping. CONSTITUTION:In a low-pressure mold clamping line L, with solenoids (a), (b) excited, a hydraulic oil is supplied into a mold clamping cylinder 1 to clamp the metallic mold at a low pressure. With a resin fed into the mold by the forward movement of the screw 3, the injection pressure overcomes the mold clamping pressure to slightly open the mold 2. At this moment, the oil returning into the line L is relieved through a pressure-reducing valve 8. When a screw stroke corresponding to the shot quantity is reached, a solenoid (c) is turned ON, while the solenoid (b) is turned OFF, and the injection operation is switched to pressure control. A pilot check valve 9 is closed, and simultaneously, a hydraulic oil is supplied through a high-pressure mold clamping line H to clamp the mold at a high pressure, thereby molding the objective article. The position of the screw 3 is detected by a rotary encoder 14.

Description

【発明の詳細な説明】 （発明の対象及び利用分野） 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 (Object of the Invention and Field of 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、予めスクリュ３を回転さ
せてホン式４内の粒状樹脂５　（ペレ・／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ュ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 being supplied to the mold clamping cylinder 1 and the mold 2 being clamped under high pressure, the screw 3 is rotated in advance to release granular resin 5 (referred to as pellets) in the Hong type 4. The resin stored in section A is transferred to injection cylinder chamber B.
By supplying high-pressure oil to advance the screw 3, the mold is injected into the mold 2 to obtain a desired molded product. At this time, the pressure for tightening the mold is always constant.

（従来技術の問題点） 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
を生ずる欠点があった。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ａ・要とする欠点があ
った。(Problems with the prior art) 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, distortion, etc. It had the disadvantage of causing problems such as cracking. Furthermore, since the resin passes through a narrow gap, there is a drawback that a large mold clamping force and injection pressure are required.

（発明の目的） 本発明は前記従来の欠点を改善し、最近注目されている
高粘度のセラミック射出成形や、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。(Object of the Invention) The object of the present invention is to improve the above-mentioned conventional drawbacks and to enable high-viscosity ceramic injection molding, which has recently been attracting attention, and the molding of thin molded products.

（発明の構成） この目的を達成するために本発明は、低圧型締ラインと
高圧型締ラインを設けて、型締圧を低圧−高圧と２段に
制御し、低圧型締時は金型が開くための戻り油をリリー
フする機能を設け、高圧型締への移行をスクリュの位置
を検出して行なうと共に、高圧型締の速度を調整でき、
かつ高圧型締時は射出を圧力制御とした構成である。(Structure of the Invention) In order to achieve this object, the present invention provides a low-pressure mold clamping line and a high-pressure mold clamping line, controls the mold clamping pressure in two stages of low pressure and high pressure, and when low-pressure mold clamping is performed, the mold A function is provided to relieve the return oil caused by the opening of the mold, and the transition to high-pressure mold clamping is performed by detecting the position of the screw, and the speed of high-pressure mold clamping can be adjusted.
In addition, during high-pressure mold clamping, injection is controlled by pressure.

（発明の構成の作用） さて前記の構成において、型締圧を２段に制御する。即
ち、最初低圧で金型を閉じて射出する。(Operation of the structure of the invention) Now, in the above structure, the mold clamping pressure is controlled in two stages. That is, the mold is first closed and injected under low pressure.

この時金型は、射出圧に負けて若干開く。その後高圧で
型締を行ない、金型を完全に閉じる。また高圧型締への
指令は、スクリュの位置で行なう。At this time, the mold opens slightly due to the injection pressure. The mold is then clamped under high pressure to completely close the mold. Also, commands for high-pressure mold clamping are given at the screw position.

（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、同し符号を
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ばスクリュ、４はホンパ、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 FIG. 3, 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 pump, and 5 is a granular resin.

次に第１図と異なる点を説明すると、６はアキュムレー
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、パイロットチェ
ック弁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。またパイロットチェック弁９
は、高圧型締ラインＨのソレノイドバルブ１０によって
制御される。Next, to explain the difference from Fig. 1, 6 is an accumulator, which is a hydraulic power source, and a low-pressure mold clamping line L is connected to this hydraulic power source.
Then, it is branched into 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．ｆ＆圧弁１１、チェック弁１
２、流量制御弁】３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。Next, to explain the high pressure mold clamping line H, the line H
is solenoid valve 10. f & pressure valve 11, check valve 1
2. Flow rate control valve] 3. The flow rate control valve 13 is used to control the mold clamping speed during high pressure mold clamping.

次にスクリュ位置の検出について説明すると、ロークリ
エンコーダ１４力ぐ、スクリュ３と連結されており、同
ロークリエンコーダ１４によりスクリュ位置を検出する
。Next, the detection of the screw position will be described. A 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ａ１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１、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 solenoid a1 of solenoid valve 7 and solenoid b of solenoid valve 10 are energized, pressure oil is supplied from low pressure mold clamping line 1 to mold clamping cylinder 1, and pressure reducing valve 8
Low-pressure mold clamping is performed at the setting of .

次にスクリュ３の前進で、樹脂が金型２内に充填（射出
ンされると、射出圧に負けて金型２は若干開く。この時
パイロットチェック弁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. 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
リュストローク（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
。これによりパイロットチェック弁９は閉し、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】
３で調整される。Next, when the screw stroke (preset) corresponding to a filling amount slightly larger than the weight of the molded product is reached, solenoid C of solenoid valve 10 is turned on, solenoid B is turned off, and the injection is set to pressure control. Switch. 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 the high-pressure mold is clamped by setting the pressure reducing valve 11. The mold clamping speed at this time is the flow rate control valve]
Adjusted by 3.

またスクリュ３の位置検出は、ロータリエンコーダ１４
にて行なうが、リミットスイッチ、ポテンショメーク、
リニアエンコーダ等によっても行なう事ができ、更にア
キュムレータ６０代りに油圧ポンプを使用してもよい。In addition, the position of the screw 3 is detected using the rotary encoder 14.
The limit switch, potentiometer make,
This can also be done using a linear encoder or the like, and a hydraulic pump may be used instead of the accumulator 60.

（本発明の特有の効果） 以上詳細に説明した如く本発明は構成されており、低圧
型締で射出を行ない、金型を若干開かせる為、射出圧力
、型締力共小さな力で良い。従って成形品内部応力の変
化が小さい。また金型が若干開く為の戻り油を、リリー
フする機能を設けたので、金型が開く過程でも一定した
低圧型締力を得ることができる。更にスクリュの位置信
号により、高圧型締へ移行する為、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。(Special Effects of the Present Invention) The present invention is constructed as described above in detail, and since injection is performed with low pressure mold clamping and the mold is slightly opened, both injection pressure and mold clamping force may be small. Therefore, the change in internal stress of the molded product is small. In addition, a function is provided to relieve the return oil that occurs when the mold opens slightly, so a constant low-pressure mold clamping force can be obtained even during the process of opening the mold. Furthermore, since the process 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.

Claims (1)

【特許請求の範囲】[Claims] 低圧型締ラインと高圧型締ラインを設けて、型締圧を低
圧−高圧と２段に制御し、低圧型締時は金型が開くため
の戻り油をリリーフする機能を設け、高圧型締への移行
をスクリュの位置を検出して行なうと共に、高圧型締の
速度を調整でき、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。A low-pressure mold clamping line and a high-pressure mold clamping line are installed to control the mold clamping pressure in two stages: low pressure and high pressure. During low-pressure mold clamping, a function is provided to relieve the return oil used to open the mold, and high-pressure mold clamping is performed. An injection compression molding method characterized by detecting the position of a screw and adjusting the speed of high-pressure mold clamping, and controlling injection pressure during high-pressure mold clamping.
JP7096584A 1984-04-11 1984-04-11 Injection compression molding method Granted JPS60242028A (en)

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 true JPS60242028A (en) 1985-12-02
JPH0438569B2 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)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6345020A (en) * 1986-08-13 1988-02-26 Toshiba Mach Co Ltd Control of 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
JPH0531774A (en) * 1990-11-08 1993-02-09 Kuraray Co Ltd Method of injection-molding synthetic resin molding
EP0868988A1 (en) * 1997-04-02 1998-10-07 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)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6345020A (en) * 1986-08-13 1988-02-26 Toshiba Mach Co Ltd Control of injection compression molding machine
JPS6394807A (en) * 1986-10-09 1988-04-25 Toshiba Mach Co Ltd Injection compression molding
JPH0511533B2 (en) * 1986-10-09 1993-02-15 Toshiba Machine Co Ltd
JPH01241420A (en) * 1988-03-24 1989-09-26 Komatsu Ltd Molding process and molding device of injection compression molding machine
JPH0523575B2 (en) * 1988-03-24 1993-04-05 Komatsu Mfg Co Ltd
JPH0531774A (en) * 1990-11-08 1993-02-09 Kuraray Co Ltd Method of injection-molding synthetic resin molding
EP0868988A1 (en) * 1997-04-02 1998-10-07 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

Also Published As

Publication number Publication date
JPH0438569B2 (en) 1992-06-24

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