JPS6119326A - Link injection mechanism - Google Patents

Link injection mechanism

Info

Publication number
JPS6119326A
JPS6119326A JP13975484A JP13975484A JPS6119326A JP S6119326 A JPS6119326 A JP S6119326A JP 13975484 A JP13975484 A JP 13975484A JP 13975484 A JP13975484 A JP 13975484A JP S6119326 A JPS6119326 A JP S6119326A
Authority
JP
Japan
Prior art keywords
screw
injection
nut
link
links
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
JP13975484A
Other languages
Japanese (ja)
Other versions
JPH0430896B2 (en
Inventor
Zenji Inaba
善治 稲葉
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 JP13975484A priority Critical patent/JPS6119326A/en
Publication of JPS6119326A publication Critical patent/JPS6119326A/en
Publication of JPH0430896B2 publication Critical patent/JPH0430896B2/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
    • 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
    • B29C2045/5012—Drive means therefor screws axially driven by a toggle mechanism

Landscapes

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

Abstract

PURPOSE:To obtain an injection mechanism whose injection control is easy by eliminating a collision between a cylinder head and a screw head, by making a mechanism of moving a screw for the injection in the direction of an axis perform through a link mechanism. CONSTITUTION:At the time of performance of injection, when a motor M2 is actuated, a ball screw 8 is revolved and a nut 7 begins to move on said ball screw 8. When the nut 7 is moved leftward, force is applied so that links 6'', 6''' are drawn out through a link 6' of a link mechanism 6. A screw 3, therefore, is moved forward (left) and a molding material is injected within a mold. As for lengths and connecting positions of the links 6', 6'', 6''' of the link mechanism 6, it does not happen that damage is caused by colliding a screw head 4 and the cylinder head 2 with each other due to a matter that the titled mechanism is so constituted that even after the nut 7 has come to the maximum advanced position of the screw 3 the servomotor M2 is turned through the damage of a controller and even when the nut 7 has moved further the screw 3 is made into points wherein the links 6', 6'', 6''' are elongated up.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、プラスチックの射出成形機においてスクリ
ューを前進させ成形材料澄射出する射出機構に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an injection mechanism for advancing a screw in a plastic injection molding machine to clearly inject a molding material.

従来技術 従来、射出成形機における射出機構としては、油圧シリ
ンダを用いて行なうものが主であったがボールスクリュ
ーを回転させて、ボールスクリュー上を移動するナツト
に射出成形機のスクリューを直接連結し、成形材料を型
に射出するものも開発され−（いる。しかし、上記の射
出機構にポールスクリｌ−を採用したものは、成形材料
の射出時、ボールスクリューに非常に大きなスラスト力
が加わるためボールスクリューを駆動するモータを大き
くする必要があり、また、ボールスクリューの軸７径を
非常に大きくしなければならない。また、射出終了時の
スクリューの駆動制御が難しく、スクリューヘッドがシ
リンダヘッドに対し１１１１１１１以下まで接近させる
必要があり、これらの制御は、コントローラによって行
なわれていたが、コントローラが故障するとスクリュー
ヘッドがシリンダヘッドに衝突し、破損を招く恐れがあ
った。Conventional technology In the past, the injection mechanism in injection molding machines mainly used hydraulic cylinders, but by rotating a ball screw, the screw of the injection molding machine was directly connected to a nut that moved on the ball screw. A device that injects the molding material into a mold has also been developed.However, the above-mentioned injection mechanism that uses a pole screw has a very large thrust force applied to the ball screw when injecting the molding material. It is necessary to make the motor that drives the ball screw large, and the diameter of the shaft 7 of the ball screw has to be made very large.Also, it is difficult to control the drive of the screw at the end of injection, and the screw head is in contact with the cylinder head. 1111111 or less, and these controls were performed by a controller, but if the controller failed, the screw head would collide with the cylinder head, potentially causing damage.

発明が解決しようとする問題点 この発明は、以上のような従来の射出機構の欠点をなり
シ、シリンダヘッドとスクリューヘッドの衝突をなくし
、射出制御のしやすい射出機構を１足供することにある
。Problems to be Solved by the Invention The purpose of this invention is to overcome the above-mentioned drawbacks of the conventional injection mechanism, eliminate the collision between the cylinder head and the screw head, and provide an injection mechanism that facilitates injection control. .

問題点を解決するための手段 射出のためにスクリューを軸方向に移動させる機構をリ
ンク機構によって行なわせるようにした。Means for Solving the Problems The mechanism for moving the screw in the axial direction for injection is provided by a link mechanism.

作　　用 スクリューはリンク機構によって軸方向に移動すること
となるため、スクリューの移動範囲はリンク機構によっ
て制限され、駆動源のモータがオーバートラベルしても
スクリューが移動しすぎることはない。また、リンク機
構によってスクリュＬ−の移動速度、即ち、射出速度や
射出圧力を適正なものに調節することができる。Since the operating screw is moved in the axial direction by the link mechanism, the range of movement of the screw is limited by the link mechanism, and even if the drive source motor overtravels, the screw will not move too much. Further, the moving speed of the screw L-, that is, the injection speed and injection pressure can be adjusted to appropriate values by the link mechanism.

実施例 図は本発明の一実施例を示す図で、１はシリンダ本体で
、該シリンダ１の先端のシリンダヘッド２には材料を金
型（図示せず）のキャビティに射出するノズル１２を有
し、該シリンダ１内にはスクリュー３が内装されており
、該スクリュー３の先端には、スクリューヘッド４が設
けられ、後端にはスプライン軸１０が固着され、さらに
、スラスト軸受５を介してリンク機構６を構成するリン
ク６″に回動自在に連結され、該リンク機構の他のリン
ク６′は、ポールスクリュ−８と螺合するナツト７ど回
動自在に連結されてａ３す、本実施例で゛示すリンク機
構のもう一つのリンク６＃は、上記二つのリンク６’、
６″を回動自在に連結し、一端を図に示寸ように射出成
形機のベース１３に回動自在に固着されている。Embodiment The figure shows an embodiment of the present invention, in which 1 is a cylinder body, and a cylinder head 2 at the tip of the cylinder 1 has a nozzle 12 for injecting material into a cavity of a mold (not shown). A screw 3 is installed inside the cylinder 1. A screw head 4 is provided at the tip of the screw 3, and a spline shaft 10 is fixed to the rear end. It is rotatably connected to a link 6'' constituting the link mechanism 6, and the other link 6' of the link mechanism is rotatably connected to a nut 7 that screws into the pole screw 8. Another link 6# of the link mechanism shown in the embodiment is the above two links 6',
6'' are rotatably connected, and one end is rotatably fixed to the base 13 of the injection molding machine as shown in the figure.

そして、ボールスクリュー８はサーボモータＭ２により
回転するようになっている。そして、前記スプライン＋
ｔ’ｌｌ＋　１０には、これにモ・−タＭ１により回転
り−るナツト１１が嵌合【ノている。なお、リンク）浅
溝６におりるリンク６’、６”、６′の長さ及び連結位
置等はスクリュー３の射出終了時がスクリＸＬ−３の最
大前進位置となり、その後はナツト７がスクリュー３の
前進方向と同じ方向に移動しても、スクリ：Ｉ−３は後
退するように各リンク６’、６″、６〜の長さを設計し
ている。また、　　′９はリミットスイッチで、ノーッ
ト７がオーバー１〜ラベルした時ぞれを検出するもので
あり、１４は成形材料をシリンダ１に投入するホッパー
である。The ball screw 8 is rotated by a servo motor M2. And the spline +
A nut 11 is fitted into t'll+ 10, which is rotated by a motor M1. Note that the lengths and connection positions of the links 6', 6'', and 6' that go into the shallow groove 6 (links) are such that the maximum forward position of the screw XL-3 is when the screw 3 has finished injecting, and after that, the nut 7 is The lengths of the links 6', 6'', and 6 are designed so that the screen I-3 moves backward even if it moves in the same direction as the forward direction of the screen I-3. Further, '9 is a limit switch that detects when the note 7 is over 1 to label, respectively, and 14 is a hopper for charging the molding material into the cylinder 1.

以上のような構成であることにより、射出を行なうとき
はモーターｔｖｆを作動すると、ボールスクリュー８は
回転し、ノーット７は該ボールスクリュー８Ｆを移動し
はじめる。前記ナラ１〜７が図中左方に移動すると、リ
ンク機構ｄのリンク６′を介してリンク６″、６″′を
引き伸ばすように、力が作用する。そのためスクリュー
３は前進（図中左方）し成形材料を金塑内に射出するこ
ととなる。With the above configuration, when the motor tvf is operated when performing injection, the ball screw 8 rotates and the knot 7 begins to move on the ball screw 8F. When the nuts 1 to 7 move to the left in the figure, a force acts to stretch the links 6'' and 6'' through the link 6' of the link mechanism d. Therefore, the screw 3 moves forward (to the left in the figure) and injects the molding material into the metal plastic.

ところで、リンク（浅溝６はナツト７が同速で移動した
場合、始めは早い速度でスクリュー３３を移動させ、進
むにつれで速度を少しず゛つ遅らせ、反対にスクリュー
３を押す力を増していくようになっている。このため、
シリンダ１内を上記のように移動するスクリュー３は、
りｆｌめ急速に移動し、成形月利を金−一すキャビディ
に圧送し、その後徐々に移動速度を遅らせていくが、反
対に射出Ｊるための圧力は増大しでいくことになり、射
出の終了時には、大きな力を成形材料に加えることがで
きる。By the way, when the nut 7 moves at the same speed, the link (shallow groove 6) moves the screw 33 at a fast speed at the beginning, gradually slows down the speed as it advances, and conversely increases the force pushing the screw 3. For this reason,
The screw 3 moving in the cylinder 1 as described above is
The injection speed moves rapidly to force the molded material into the metal cavity, and then gradually slows down, but on the other hand, the pressure for injection increases, and the injection At the end of the process, large forces can be applied to the molding material.

一方、射出成形機のスクリュ−３の動きを考えるに、ス
クリ：ｔ　−３は移動当初はその速度を早くして成形月
利が金型キャビティ内に充填終了する頃即ちズクリーｌ
−のＱＪ出終了時間近では、移動速度は遅くすることに
よって良品の成形品を得ることができることが知られて
おり、ま１〔、充填終了時には大きな射出圧力が必要な
ことからこの発明のスクリュー３の！Ｊ＋　Ａ及び材料
に与える力は上記の射出成形機のスクリュー−として求
められているものを１−分満たり′ものである。このよ
うにリンク機構６を介してスクリューを前進さけるよう
にしであるから、リンク機構６により力が増大されるの
で、従来のにうに、ボールスクリューの径を大きく゛り
る必要もない。On the other hand, considering the movement of the screw 3 of an injection molding machine, the speed of the screw t-3 is increased at the beginning of the movement, and when the molding machine finishes filling the mold cavity, that is, the screw t-3 is
It is known that a molded product of good quality can be obtained by slowing down the moving speed near the end of QJ injection. 3! The force applied to J+A and the material is 1 minute less than that required for the screw of the injection molding machine mentioned above. Since the screw is moved forward through the link mechanism 6 in this way, the force is increased by the link mechanism 6, so there is no need to increase the diameter of the ball screw as in the prior art.

また、リンク機構６のリンク６’　、６″、６″の長さ
及び連結位置等はスクリュー３の射出終了。時が、スク
リュー３の最大前進位置即ち、リンク６’　、６″、６
”の長さが伸びきった点とすることにより、ナツト７が
該スクリューの最大前進位置に来た後もコン１〜［１−
ラーの故障等によりサーボモータ八４２が回転し、さら
にノット７が移動した時でも、逆にスクリコーを後：Ｆ
”　Ｅ＼Ｕるようになっているために、スクリューヘッ
ド１とシリングヘラ＋’２が衝突（ハ破損を１１１りと
いうような恐れも生じない。また、このＪ、うな場合、
リミツ１〜スイッｙ−０によって一ノット７の異常移動
を検出し、コントローラ等の故障を検出ザることがでさ
・る。Also, the lengths and connection positions of the links 6', 6'', 6'' of the link mechanism 6 are determined at the end of the injection of the screw 3. time is the maximum forward position of the screw 3, that is, the links 6', 6'', 6
By setting the point at which the length of the screw is fully extended, even after the nut 7 reaches the maximum forward position of the screw, the controllers 1 to [1-
Even if the servo motor 842 rotates due to a failure of the screwdriver, etc., and the knot 7 moves further, the screwdriver will be turned backwards: F
Because the screw head 1 and the shilling spatula 2 collide (there is no risk of damage), there is no risk of damage.
An abnormal movement of one knot 7 can be detected by limit 1 to switch y-0, and a failure of the controller etc. can be detected.

計量時におい−Ｃは、−［−夕Ｎ４１を駆動し、スプラ
イン用ナツト１１を回転さ！Ｊ、スクリ１−−３を回転
さけるが、成形材オ′１の溶融圧力ににす、スクリュー
３は後退り−るが、そのとき、リーボモータＭ２の駆動
電流を制御するξ−とにより、スクリコ−３に背圧を印
加し、スクリコ−３が後退り−るにつれてナツト７も後
退し、ボールスクリ」−８゜ザーボモータＭ２も逆転す
ることとなる。During weighing, -C drives N41 and rotates the spline nut 11! J, the screws 1--3 are avoided from rotating, but when the melting pressure of the molding material O'1 is reached, the screw 3 retreats, but at that time, the screw 3 is moved back by ξ-, which controls the drive current of the rib motor M2. Back pressure is applied to the screwdriver 3, and as the screwdriver 3 moves backward, the nut 7 also moves backward, and the ball screwdriver 8° servo motor M2 also rotates in the reverse direction.

なお、上記実施例では、リンク機構としてトグル機構を
使用したが、射出の始めはスクリューの射出速磨を早く
、射出が終わりに近付くにつれて、射出速麿が遅くなる
ような、他のリンク構造を使用してもよい。In the above embodiment, a toggle mechanism was used as the link mechanism, but other link structures could be used, such as fastening the injection speed of the screw at the beginning of injection and slowing down the injection speed as the injection approaches the end. May be used.

発明の効果 本発明（ま、駆動源の力をリンク、機構を介してスクリ
ューに伝動り−る割出機構としたため、スクリコーの移
１ＰＩＪ量がリンク機構によって制限されるため、スク
リ」−ヘッドがシリンダヘッドに衝突しシリンダヘッド
等を破損さぜ′るようなことはない。Effects of the Invention The present invention uses an indexing mechanism that transmits the force of the drive source to the screw via a link and a mechanism, so the displacement of the screw head is limited by the link mechanism. There is no possibility of collision with the cylinder head and damage to the cylinder head, etc.

また、リンク機構の特性で、ａ＝１出の始めは射出スピ
ードが早く、射出の終わり頃には射出スピードが遅くな
るが射出圧力を増大り−ることができ、射出特性に合致
した割出機構を得ることができる。In addition, due to the characteristics of the link mechanism, the injection speed is fast at the beginning of a = 1 injection, and the injection speed slows down toward the end of injection, but the injection pressure can be increased. You can get the mechanism.

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

図はこの発明の一実施例を示づ一図である。 １・・・シリンダ水鉢、２・・・シリンダヘッド、３・
・・スクリュー、４・・・スクリューヘッド、５・・・
スラスト軸受、６・・・トグル機構、７・・・〕−ット
、８・・・ボールスクリュー、９・・・リミットスイッ
チ、１０・・・スプライン軸、１１・・・ナツト、１２
・・・射出用ノズル、Ｍｌ・・・モータ、Ｍ２・・・１
ナーボ［−夕。The figure is a diagram showing an embodiment of the present invention. 1... Cylinder water bowl, 2... Cylinder head, 3...
...Screw, 4...Screw head, 5...
Thrust bearing, 6... Toggle mechanism, 7...]-t, 8... Ball screw, 9... Limit switch, 10... Spline shaft, 11... Nut, 12
...Injection nozzle, Ml...motor, M2...1
Nabo [-Evening.

Claims (3)

【特許請求の範囲】[Claims] （１）射出成形機の射出機構において、駆動源の力をリ
ンク機構を介してスクリューに伝動し、該スクリューを
軸方向に移動させ成形材料を射出するようにしたリンク
式射出機構。(1) In the injection mechanism of an injection molding machine, a link type injection mechanism is configured to transmit the force of a driving source to a screw via a link mechanism, move the screw in the axial direction, and inject the molding material. （２）上記リンク機構はトグル機構である特許請求の範
囲第１項記載のリンク式射出機構。(2) The link type injection mechanism according to claim 1, wherein the link mechanism is a toggle mechanism. （３）上記駆動源はサーボモータである特許請求の範囲
第１項又は第２項記載のリンク式射出機構。(3) The link type injection mechanism according to claim 1 or 2, wherein the drive source is a servo motor.
JP13975484A 1984-07-07 1984-07-07 Link injection mechanism Granted JPS6119326A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13975484A JPS6119326A (en) 1984-07-07 1984-07-07 Link injection mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13975484A JPS6119326A (en) 1984-07-07 1984-07-07 Link injection mechanism

Publications (2)

Publication Number Publication Date
JPS6119326A true JPS6119326A (en) 1986-01-28
JPH0430896B2 JPH0430896B2 (en) 1992-05-25

Family

ID=15252607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13975484A Granted JPS6119326A (en) 1984-07-07 1984-07-07 Link injection mechanism

Country Status (1)

Country Link
JP (1) JPS6119326A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02206524A (en) * 1989-02-07 1990-08-16 Sumitomo Heavy Ind Ltd Injection driving mechanism of motorized injection molder
EP0451294A1 (en) * 1989-11-02 1991-10-16 Fanuc Ltd. Crank type injection device
WO2002011969A1 (en) * 2000-08-08 2002-02-14 Bosch Rexroth Ag Injection unit for a plastic injection molding machine
JP2003025368A (en) * 2001-05-10 2003-01-29 Toyo Mach & Metal Co Ltd Toggle link type injection molding mechanism
US7128563B2 (en) 2003-08-18 2006-10-31 Industrial Technology Research Institute Clamping device for injection-molding machine
US7165966B2 (en) * 2002-05-31 2007-01-23 Toshiba Kikai Kabushiki Kaisha Injection molding machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02206524A (en) * 1989-02-07 1990-08-16 Sumitomo Heavy Ind Ltd Injection driving mechanism of motorized injection molder
EP0451294A1 (en) * 1989-11-02 1991-10-16 Fanuc Ltd. Crank type injection device
WO2002011969A1 (en) * 2000-08-08 2002-02-14 Bosch Rexroth Ag Injection unit for a plastic injection molding machine
JP2003025368A (en) * 2001-05-10 2003-01-29 Toyo Mach & Metal Co Ltd Toggle link type injection molding mechanism
JP4532777B2 (en) * 2001-05-10 2010-08-25 東洋機械金属株式会社 Toggle link type injection molding mechanism
US7165966B2 (en) * 2002-05-31 2007-01-23 Toshiba Kikai Kabushiki Kaisha Injection molding machine
US7128563B2 (en) 2003-08-18 2006-10-31 Industrial Technology Research Institute Clamping device for injection-molding machine

Also Published As

Publication number Publication date
JPH0430896B2 (en) 1992-05-25

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