JPS6168219A - Injection mechanism with accumulator - Google Patents

Injection mechanism with accumulator

Info

Publication number
JPS6168219A
JPS6168219A JP19047484A JP19047484A JPS6168219A JP S6168219 A JPS6168219 A JP S6168219A JP 19047484 A JP19047484 A JP 19047484A JP 19047484 A JP19047484 A JP 19047484A JP S6168219 A JPS6168219 A JP S6168219A
Authority
JP
Japan
Prior art keywords
accumulator
screw
injection
plate
pressure 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.)
Granted
Application number
JP19047484A
Other languages
Japanese (ja)
Other versions
JPH0427935B2 (en
Inventor
Masato Yamamura
正人 山村
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.)
Fanuc Corp
Original Assignee
Fanuc Corp
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 Fanuc Corp filed Critical Fanuc Corp
Priority to JP19047484A priority Critical patent/JPS6168219A/en
Publication of JPS6168219A publication Critical patent/JPS6168219A/en
Publication of JPH0427935B2 publication Critical patent/JPH0427935B2/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
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means 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
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1798—Using spring tension to drive movable machine parts

Landscapes

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

Abstract

PURPOSE:To obtain stable accumulator effects always by providing an accumulator position collecting device that moves and collects in the direction of a screw shaft the position of an accumulator for compressing a pressure plate. CONSTITUTION:When a metering process is finished and the screw 1 is returned to the injection starting position, the ball screw 16 is driven by the servo motor M2 to compress the spring 11 by the plate 13 and compress the pressure plate 3 by repulsion force through the operating plate 12. The screw 16 is advanced up to the advancing position corresponding to a set metering amount and stops the motor M2. When the plate 3 is advanced for injection by the servo motor M1 through the ball screw 6, the nut 5, the repulsion force accumulated in the spring 11 is piled up instantaneously, the plate 3 and the screw 1 are moved at a high speed, at a high pressure for injection. Thereby, constant accumulator effects can be obtained at all times.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、射出成形機における射出機構に関し、特に、
射出機構に使用するアキュムレータに関するものである
。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an injection mechanism in an injection molding machine, and in particular:
This relates to an accumulator used in an injection mechanism.

従来技術 従来の射出成形機においては、スクリューを前進させて
射出を行う場合、油圧シリンダを用いて射出を行わせて
いた。そして、瞬間的な射出圧力を得るために高圧の油
を貯えるアキュムレータを用いて瞬間的に油圧ポンプの
供給する油量よりも大社の高圧油を放出させて油圧シリ
ンダの作動を高速化して射出圧力の上昇を速くし、高圧
、高速の射出を行わせていた。Prior Art In conventional injection molding machines, when injection is performed by advancing a screw, a hydraulic cylinder is used to perform the injection. In order to obtain instantaneous injection pressure, an accumulator that stores high-pressure oil is used to instantaneously release Taisha's high-pressure oil than the amount of oil supplied by the hydraulic pump, speeding up the operation of the hydraulic cylinder and increasing the injection pressure. This increased the speed of the rise and caused high-pressure, high-speed injection.

しかし、射出動作をモータで行わせる場合は油を用いた
アキュムレータは使用することができず、そのため、特
願昭５８−２４１０５７号で示されるように、フライホ
イールやガスアキュムレータを用いて高圧、高速の射出
を行わせる方式も開発されている。この場合、計量設定
量に応じてスクリューの射出開始位置が異なるため、安
定したアキュムレータの効果が得られなかった。However, when the injection operation is performed by a motor, an oil-based accumulator cannot be used. Therefore, as shown in Japanese Patent Application No. 58-241057, a flywheel or gas accumulator is used to achieve high pressure and high speed. A method for ejecting the gas has also been developed. In this case, since the injection start position of the screw differs depending on the metered amount, a stable accumulator effect could not be obtained.

発明が解決しようとする問題点 本発明は、スクリューを前進させて射出を行う駆動源に
モータを使用する射出機構において、計最設定ωが変化
して、スクリューの射出開始位置が変化しでもアキュム
レータの効果が常に一定になるよう制御できるアキュム
レータ付射出機構を得ることにある。Problems to be Solved by the Invention The present invention provides an injection mechanism in which a motor is used as a drive source for advancing a screw and injecting, and even if the total setting ω changes and the injection start position of the screw changes, the accumulator An object of the present invention is to obtain an injection mechanism with an accumulator that can be controlled so that the effect is always constant.

問題点を解決するための手段 本発明は、モータの駆動によりプレッシャプレートを移
動させてスクリューを軸方向に移動させて射出を行う射
出成形機における射出機構において、上記プレッシャプ
レートを押圧するアキュムレータを設け、該アキュムレ
ータの位置をスクリューの軸方向に移動させて補正する
アキュムレータ位置補正装置を設けたものである。Means for Solving the Problems The present invention provides an injection mechanism for an injection molding machine in which injection is performed by moving a pressure plate driven by a motor and moving a screw in the axial direction, including an accumulator that presses the pressure plate. , an accumulator position correction device is provided for correcting the position of the accumulator by moving it in the axial direction of the screw.

作　　用 スクリューの射出開始位置は計量設定量に応じて変動す
るが、その変動量をアキュムレータ位置補正装置にて補
正し、射出開始時には計量設定量が変化してもアキュム
レータが常に一定のエネルギーを蓄積し、プレッシャプ
レートを押圧するようにする。そのため、射出時にはア
キュムレータに蓄積された一定のエネルギーが瞬間的に
スクリューに加わり、高速、高圧で射出を行う。The injection start position of the working screw fluctuates depending on the set metering amount, but this variation is corrected by the accumulator position correction device, so that at the start of injection, the accumulator always accumulates a constant amount of energy even if the set metering amount changes. and press the pressure plate. Therefore, during injection, a certain amount of energy stored in the accumulator is instantaneously applied to the screw, causing injection at high speed and high pressure.

実施例 図は、本発明の実施例で、１は射出成形機におけるスク
リュー、２はスクリュー軸、３はプレッシャプレートで
、該プレッシャプレート３に軸受４を介してスクリュー
軸２が回動自在に固着されている。５ａ、５ｂはボール
ナットで、上記プレッシャプレート３に固着され、ボー
ルスクリュー５ａ、５ｂと螺合している。７ａ、７ｂは
上記ボールスクリュー６ａ　、６ｂに固着されたタイミ
ング歯車で、８はサーボモータＭ１の駆動軸に固着され
たタイミング歯車で、上記タイミング歯車７ａ、７ｂ、
８間にはタイミングベルト９が架けられている。また、
上記プレッシャプレート３にはアキュムレータ１０の一
端が当接するようになっており、該アキュムレータ１０
は本実施例ではスプリング１１で構成され、該スプリン
グ１１はプレッシＶブレー１・３と当接する作動板１２
に一端が固着され、他端は後述するアキュムレータ位置
補正装置のボールスクリュー１６の先端に固着された板
１３に固着されている。また、上記作動板１２にはガイ
ドロット１４ａ、１４ｂが固着され、該ガイドロット１
４ａ、１４ｂは上記板１３に設けられたガイド孔１５ａ
、１５ｂを貫通し摺動自在となっている。上記ボールス
クリュー１６には局面に歯車１７が形成されたボールナ
ット１８が螺合しており、サーボモータＭ２の駆動軸に
固着された歯車１９と上記歯車１７が噛み合っている。The figure shows an embodiment of the present invention, in which 1 is a screw in an injection molding machine, 2 is a screw shaft, and 3 is a pressure plate, and the screw shaft 2 is rotatably fixed to the pressure plate 3 via a bearing 4. has been done. Ball nuts 5a and 5b are fixed to the pressure plate 3 and screwed into ball screws 5a and 5b. 7a, 7b are timing gears fixed to the ball screws 6a, 6b, 8 is a timing gear fixed to the drive shaft of the servo motor M1, and the timing gears 7a, 7b,
A timing belt 9 is placed between the parts 8 and 8. Also,
One end of an accumulator 10 comes into contact with the pressure plate 3, and the accumulator 10
In this embodiment, the spring 11 is composed of an actuating plate 12 that comes into contact with the pressure V-brakes 1 and 3.
One end is fixed to , and the other end is fixed to a plate 13 fixed to the tip of a ball screw 16 of an accumulator position correction device to be described later. Further, guide rods 14a and 14b are fixed to the actuating plate 12, and the guide rods 14a and 14b are fixed to the actuating plate 12.
4a and 14b are guide holes 15a provided in the plate 13.
, 15b and is slidable. A ball nut 18 having a gear 17 formed on its curved surface is screwed into the ball screw 16, and the gear 17 meshes with a gear 19 fixed to the drive shaft of the servo motor M2.

そして、これらサーボモータＭ２．歯車１７，１９、ボ
ールナット１８．ボールスクリュー１６でアキュムレー
タ位置補正装置を構成している。なお、スクリュー１を
回転させる回転機構は本発明の要旨ではないので省略し
図示していない。These servo motors M2. Gears 17, 19, ball nuts 18. The ball screw 16 constitutes an accumulator position correction device. Note that the rotation mechanism for rotating the screw 1 is omitted and not shown since it is not the gist of the present invention.

次に、本実施例の動作について説明する。Next, the operation of this embodiment will be explained.

計口行程が終了し、スクリュー１が射出開始位置に戻さ
れると、アキュムレータ位置補正装置のサーボモータＭ
２を駆動させてボールスクリュー１６を図中左方に移動
させ、板１３によりスプリング１１を圧縮させて、この
圧縮により生じる反発力を作動板１２を介してプレッシ
ャプレート３を押圧する。そして、計量設定量に応じて
決まるボールスクリュー１６の前進位置まで該ボールス
クリュー１６を前進させ、サーボモータＭ２の駆動を停
止する。すなわち、計量設定量が変化しても、常に上記
スプリング１１が一定量だけ圧縮されるようにアキュム
レータ位置補正装置を作動させるものである。そして、
射出を行うにはサーボモータＭ１を駆動し、ボールスク
リュー６ａ、６ｂを回転させ、ボールナット５ａ、５ｂ
を介してプレッシャプレート３を前進させれば、上記ス
プリング１１に蓄積されていた反発力が射出開始時瞬間
的にｆｉ　Ｗされ、プレッシャプレート３及びスクリュ
ー１は高速、高圧で軸方向に移動し射出することとなる
。次に、計量時にはサーボモータＭ２を逆転させてボー
ルスクリュー１６及びスプリング１１１作動板１２を後
退させると共にスクリュー１を回転させ、成形材料の溶
融によりスクリュー１が後方に押圧され、それをサーボ
モータＭ１により一定背圧を加えながら、プレッシャプ
レート３及びスクリュー１を計量点まで後退させる。When the metering stroke is completed and the screw 1 is returned to the injection start position, the servo motor M of the accumulator position correction device
2 to move the ball screw 16 to the left in the figure, the plate 13 compresses the spring 11, and the repulsive force generated by this compression presses the pressure plate 3 via the actuating plate 12. Then, the ball screw 16 is advanced to the forward position determined according to the metering setting amount, and the driving of the servo motor M2 is stopped. That is, the accumulator position correction device is operated so that the spring 11 is always compressed by a constant amount even if the metering setting changes. and,
To perform injection, drive the servo motor M1, rotate the ball screws 6a and 6b, and rotate the ball nuts 5a and 5b.
When the pressure plate 3 is advanced through the spring 11, the repulsive force accumulated in the spring 11 is instantaneously released at the start of injection, and the pressure plate 3 and the screw 1 move in the axial direction at high speed and high pressure to initiate injection. I will do it. Next, during weighing, the servo motor M2 is reversed to move the ball screw 16, spring 111 and operating plate 12 backward, and the screw 1 is rotated.The screw 1 is pushed backward by the melting of the molding material, and the servo motor M1 pushes it backward. The pressure plate 3 and screw 1 are retreated to the measuring point while applying a constant back pressure.

そして、前述の射出行程の動作に移行する。Then, the operation shifts to the injection stroke described above.

なお、上記実施例では、アキュムレータとしてスプリン
グを使用したが、ガス式のアキュムレータを使用しても
よい。この場合、プレッシャプレート３にはガス式アキ
ュムレータのピストン軸を固着し、ボールスクリュー１
６の先端にガスシリンダを固着すればよい。また、その
逆でもよい。In addition, in the above embodiment, a spring was used as the accumulator, but a gas type accumulator may also be used. In this case, the piston shaft of the gas accumulator is fixed to the pressure plate 3, and the ball screw 1
A gas cylinder may be fixed to the tip of 6. Moreover, the reverse is also possible.

また、アキュムレータ位置補正装置としてはボールスク
リューの代りにラックを用い、サーボモータによりビニ
オンを駆動してアキュムレータの位置を補正するもので
あってもよく、スクリュー軸方向に移動でき、設定位置
で固定できるものであればよい。Furthermore, the accumulator position correction device may be one that uses a rack instead of a ball screw and drives a pinion with a servo motor to correct the position of the accumulator, and can be moved in the direction of the screw axis and fixed at a set position. It is fine as long as it is something.

発明の効果 以上述べたように、本発明は、アキュムレータ位置補正
装置を設け、計量設定量に応じてアキュムレータ位置を
補正し、・常に一定の圧力が発生できるようにしたから
、計量設定量が変化してスクリューの射出開始位置が変
動しても常に一定の７キユムレータの効果が得られる。Effects of the Invention As described above, the present invention is equipped with an accumulator position correction device to correct the accumulator position according to the metered set amount, so that a constant pressure can always be generated, so that the metered set amount does not change. Even if the injection start position of the screw changes, a constant 7-cumulator effect can always be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

図は、本発明の一実施例の説明図である。 １・・・スクリュー、３・・・プレッシャプレート、５
ａ　、　５ｂ　、　　１８・＝ボールナツト、６ａ　、
　６ｂ　。 １６・・・ボールスクリュー、９・・・タイミングベル
ト、１０・・・アキュムレータ、１１・・・スプリング
、Ｍｌ、Ｍ２・・・サーボモータ。The figure is an explanatory diagram of an embodiment of the present invention. 1...Screw, 3...Pressure plate, 5
a, 5b, 18・= ball nut, 6a,
6b. 16... Ball screw, 9... Timing belt, 10... Accumulator, 11... Spring, Ml, M2... Servo motor.

Claims (4)

【特許請求の範囲】[Claims] （１）モータの駆動によりプレッシャプレートを移動さ
せてスクリューを軸方向に移動させて射出を行う射出成
形機における射出機構において、上記プレッシャプレー
トを押圧するアキュムレータと、該アキュムレータの位
置を補正するアキュムレータ位置補正装置を有すること
を特徴とするアキュムレータ付射出機構。(1) In an injection mechanism in an injection molding machine that moves a pressure plate driven by a motor and moves a screw in the axial direction to perform injection, there is an accumulator that presses the pressure plate, and an accumulator position that corrects the position of the accumulator. An injection mechanism with an accumulator, characterized by having a correction device. （２）上記アキュムレータはスプリングで構成され、該
スプリングの一端は上記プレッシャプレートを押圧し、
他端は上記アキュムレータ位置補正装置のスクリュー軸
方向に移動する部材に固着されている特許請求の範囲第
１項記載のアキュムレータ付射出機構。(2) The accumulator is composed of a spring, and one end of the spring presses the pressure plate,
2. The injection mechanism with an accumulator according to claim 1, wherein the other end is fixed to a member that moves in the direction of the screw axis of the accumulator position correction device. （３）上記アキュムレータはガス式シリンダで構成され
、上記プレッシャプレートに上記ガス式シリンダのピス
トンロッドかシリンダのどちらか一方が固着され、他方
は上記アキュムレータ位置補正装置のスクリュー軸方向
に移動する部材に固着されている特許請求の範囲第１項
記載のアキュムレータ付射出機構。(3) The accumulator is composed of a gas cylinder, and either the piston rod or the cylinder of the gas cylinder is fixed to the pressure plate, and the other is attached to a member that moves in the screw axis direction of the accumulator position correction device. An injection mechanism with an accumulator according to claim 1, wherein the injection mechanism is fixed. （４）上記アキュムレータ位置補正装置はサーボモータ
で駆動されるボールナットと、該ボールナットと螺合し
スクリュー軸方向に移動するボールスクリューからなり
、上記スクリュー軸方向に移動する部材は上記ボールス
クリューである特許請求の範囲第１項、第２項または第
３項記載のアキュムレータ付射出機構。(4) The accumulator position correction device consists of a ball nut driven by a servo motor and a ball screw that is screwed into the ball nut and moves in the axial direction of the screw, and the member that moves in the axial direction of the screw is the ball screw. An injection mechanism with an accumulator according to claim 1, 2 or 3.
JP19047484A 1984-09-13 1984-09-13 Injection mechanism with accumulator Granted JPS6168219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19047484A JPS6168219A (en) 1984-09-13 1984-09-13 Injection mechanism with accumulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19047484A JPS6168219A (en) 1984-09-13 1984-09-13 Injection mechanism with accumulator

Publications (2)

Publication Number Publication Date
JPS6168219A true JPS6168219A (en) 1986-04-08
JPH0427935B2 JPH0427935B2 (en) 1992-05-13

Family

ID=16258711

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19047484A Granted JPS6168219A (en) 1984-09-13 1984-09-13 Injection mechanism with accumulator

Country Status (1)

Country Link
JP (1) JPS6168219A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997034757A1 (en) * 1996-03-19 1997-09-25 Engel Maschinenbau Gesellschaft Mbh Means for driving a displaceably mounted component of an injection moulding machine
WO2002040246A1 (en) * 2000-11-14 2002-05-23 Netstal-Maschinen Ag Method and device for the ejection of injection moulded pieces
WO2002085599A1 (en) * 2001-04-19 2002-10-31 Demag Ergotech Gmbh Injection moulding machine comprising an electromotive spindle drive and a spring working memory for supporting the electric motor
EP1524092A1 (en) * 2003-10-03 2005-04-20 Daiwa Kasei Industry Co., Ltd. Motor-driven injection molding apparatus
CN104985779A (en) * 2014-02-28 2015-10-21 恩格尔奥地利有限公司 Injection assembly for a molding machine
US10481591B2 (en) 2016-07-26 2019-11-19 Fanuc Corporation Numerical controller
CN110919998A (en) * 2019-12-12 2020-03-27 陆聆聆 Injection molding equipment capable of automatically closing mold and vibrating by using gravity of plastic

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997034757A1 (en) * 1996-03-19 1997-09-25 Engel Maschinenbau Gesellschaft Mbh Means for driving a displaceably mounted component of an injection moulding machine
US5980235A (en) * 1996-03-19 1999-11-09 Engel Maschinenbau Gesellschaft M.B.H. Means for driving a displaceably mounted component of an injection moulding machine
WO2002040246A1 (en) * 2000-11-14 2002-05-23 Netstal-Maschinen Ag Method and device for the ejection of injection moulded pieces
WO2002085599A1 (en) * 2001-04-19 2002-10-31 Demag Ergotech Gmbh Injection moulding machine comprising an electromotive spindle drive and a spring working memory for supporting the electric motor
US7086851B2 (en) 2001-04-19 2006-08-08 Demag Ergotech GmbH & L & T-Demag Plastics Machinery Injection molding machine with an electromotive spindle drive and a spring-based energy storage device for supporting the electric motor
EP1524092A1 (en) * 2003-10-03 2005-04-20 Daiwa Kasei Industry Co., Ltd. Motor-driven injection molding apparatus
US7156652B2 (en) 2003-10-03 2007-01-02 Daiwa Kasei Industry Co., Ltd. Motor-driven injection molding apparatus
CN104985779A (en) * 2014-02-28 2015-10-21 恩格尔奥地利有限公司 Injection assembly for a molding machine
US9498910B2 (en) 2014-02-28 2016-11-22 Engel Austria Gmbh Injection assembly for a molding machine
CN104985779B (en) * 2014-02-28 2017-07-28 恩格尔奥地利有限公司 Injection unit for forming machine
US10481591B2 (en) 2016-07-26 2019-11-19 Fanuc Corporation Numerical controller
CN110919998A (en) * 2019-12-12 2020-03-27 陆聆聆 Injection molding equipment capable of automatically closing mold and vibrating by using gravity of plastic

Also Published As

Publication number Publication date
JPH0427935B2 (en) 1992-05-13

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