JPS63154320A - Injection molding machine - Google Patents

Injection molding machine

Info

Publication number
JPS63154320A
JPS63154320A JP30178286A JP30178286A JPS63154320A JP S63154320 A JPS63154320 A JP S63154320A JP 30178286 A JP30178286 A JP 30178286A JP 30178286 A JP30178286 A JP 30178286A JP S63154320 A JPS63154320 A JP S63154320A
Authority
JP
Japan
Prior art keywords
mold
injection cylinder
pressing force
servoamplifier
torque
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.)
Pending
Application number
JP30178286A
Other languages
Japanese (ja)
Inventor
Masahiko Mizuno
正彦 水野
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo 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 Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP30178286A priority Critical patent/JPS63154320A/en
Publication of JPS63154320A publication Critical patent/JPS63154320A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating

Landscapes

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

Abstract

PURPOSE:To contrive simplification in controlling of pressing force of a mold by an injection cylinder, by a method wherein when the tip part of the injection cylinder comes into contact with a mold, torque of an electric motor is controlled based on pressing force set up beforehand. CONSTITUTION:Pressing force pressing a stationary mold 2 by a nozzle part of an injection cylinder 6 is set up through a pressing force setting instrument 13. When the injection cylinder 6 comes into contact with the stationary mold 2 by passing through a communicating passage provided on a stationary platen 1, a load to be applied to a servomotor 11 is increased. Consequently, an output electric current through a servoamplifier 12 is increased and the torque of the servomotor 11 is increased. Therefore, an electric current commanding value corresponding to preset nozzle touching force is applied to the servoamplifier 12 through a pressing pressure setting instrument 14. Therefore, at a point of time when the output current through the servoamplifier 12 has increased up to a value corresponding to the electric current commanding value, an increase of the current is suspended by the servoamplifier 12. Consequently, the servomotor 11 puts out the torque corresponding to the output electric current, through which the nozzle part of the cylinder 6 presses the stationary mold 2 by the preset nozzle touching force. Then molten resin is injected into a cavity through the cylinder 6.

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関し、特に射出シリンダ先端部の
金型への接触押圧力の制御に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding machine, and more particularly to control of the contact pressing force of the tip of an injection cylinder to a mold.

(従来の技術) 射出成形機において、金型キャピテイに射出シリンダか
ら溶融樹脂を射出する際、電動サーボモータによシ射出
シリンダを金型方向に前進させて。
(Prior Art) In an injection molding machine, when injecting molten resin from an injection cylinder into a mold cavity, an electric servo motor advances the injection cylinder toward the mold.

射出シリンダの先端部(ノズル部)を金型に押し付ける
。これによりて、射出シリンダに備えられたバネをたわ
ませ、十分な押圧力が発生した時点で、fレーキ機構に
よシ射出シリンダを保持し。
Press the tip of the injection cylinder (nozzle part) against the mold. As a result, the spring provided in the injection cylinder is bent, and when a sufficient pressing force is generated, the injection cylinder is held by the f-rake mechanism.

その後、金型キャビティに溶融樹脂を射出している。Then, molten resin is injected into the mold cavity.

このように、射出成形機では、溶融樹脂の射出の際、樹
脂の反力以上の力で、射出シリンダノズル部を金型に押
し付けなければならない。
In this manner, in an injection molding machine, when injecting molten resin, the injection cylinder nozzle portion must be pressed against the mold with a force greater than the reaction force of the resin.

(発明が解決しようとする問題点) ところが、上述の樹脂による反力は金型及び樹脂の種類
によって変わってしまうため、その都度。
(Problem to be Solved by the Invention) However, the reaction force due to the resin described above varies depending on the mold and the type of resin, so it is difficult to solve the problem each time.

バネを交換するかあるいはバネのたわみ量をコントロー
ルしなければならず、射出シリンダによる金型の押圧力
調整が極めて困難であるという問題点がある。
The problem is that the spring must be replaced or the amount of deflection of the spring must be controlled, making it extremely difficult to adjust the pressing force of the mold by the injection cylinder.

(問題点を解決するための手段) 本発明によれば、金型内に形成されたキャビティに溶融
樹脂を射出する射出シリンダと、該射出シリンダを前記
金型に対して前進及び後退させるための電動機とを有す
る射出成形機において、前記射出シリンダ先端部の前記
金型への押圧力を設定する押圧力設定手段と、前記射出
シリンダ先端部が前記金型に接触すると、前記押圧力設
定手段で設定された押圧力に基づいて前記電動機のトル
(Means for Solving the Problems) According to the present invention, there is provided an injection cylinder for injecting molten resin into a cavity formed in a mold, and an injection cylinder for advancing and retracting the injection cylinder with respect to the mold. an injection molding machine having an electric motor, a pressing force setting means for setting a pressing force of the tip of the injection cylinder against the mold; and when the tip of the injection cylinder comes into contact with the mold, the pressing force setting means Torque of the electric motor based on the set pressing force.

りを制御する制御手段とを有することを特徴とする射出
成形機が得られる。
There is obtained an injection molding machine characterized in that it has a control means for controlling the temperature.

(実施例) 以下本発明について実施例によって説明する。(Example) The present invention will be explained below with reference to Examples.

第1図を参照して、固定プラテンlの一面上には固定金
型2が取シ付けられ、一方、可動グラテン4の一面上に
は可動金型3が取シ付けられている。可動プラテン4は
図示しない型締め装置によシ図中左右に移動され、型締
めが完了した時点で。
Referring to FIG. 1, a fixed mold 2 is mounted on one surface of a fixed platen l, while a movable mold 3 is mounted on one surface of a movable grating 4. As shown in FIG. The movable platen 4 is moved from side to side in the figure by a mold clamping device (not shown), and when mold clamping is completed.

固定金型2と可動金型3とによってキャビティ(図示せ
ず)が形成される。固定プラテン1に対向してホッパー
5を備える射出シリンダ6が配設されている。射出シリ
ンダ6の後端部にはネジ軸7が備えられている。
A cavity (not shown) is formed by the fixed mold 2 and the movable mold 3. An injection cylinder 6 equipped with a hopper 5 is disposed opposite the fixed platen 1. A screw shaft 7 is provided at the rear end of the injection cylinder 6 .

歯車8にはネジナツト9が固着されている。このネジナ
ツト9の内周面にはネジが切られており。
A screw nut 9 is fixed to the gear 8. The inner peripheral surface of this screw nut 9 is threaded.

このネジと前記ネジ軸7のネジがかみ合っている。This screw and the screw of the screw shaft 7 are engaged with each other.

歯車8には歯車lOがかみ合わされておシ、歯車10の
回転軸(中心軸)はサーボモータ11に連結されている
。このサー?モータlF丘サーボ増幅器(サーボアンf
)12が接続されている。
A gear lO is meshed with the gear 8, and a rotating shaft (center shaft) of the gear 10 is connected to a servo motor 11. This sir? Motor IF hill servo amplifier (servo amplifier f
)12 are connected.

また、このサーボアンプ12には押圧力設定器13が接
続される一方、スイッチ14aを介して前進速度設定器
14が接続されるとともにスイッチ15aを介して後退
速度設定器15が接続されている。また、サーボモータ
11の回転数(回転速度)が速度検出器(図示せず)で
検出されて。
Further, the servo amplifier 12 is connected to a pressing force setting device 13, a forward speed setting device 14 via a switch 14a, and a backward speed setting device 15 via a switch 15a. Further, the number of rotations (rotational speed) of the servo motor 11 is detected by a speed detector (not shown).

サーがアンプ12に入力されている。signal is input to the amplifier 12.

押圧力設定器13から射出シリンダ6の先端部(ノズル
部)が固定金型2を押圧する押圧力(以下ノズルタッチ
力という)が設定され、一方、前進速度設定器14から
射出シリンダ6の前進速度が設定されるとともに後退速
度設定器15から射出シリンダ6の後退速度が設定され
る。
The pressing force setting device 13 sets the pressing force (hereinafter referred to as nozzle touch force) for the tip (nozzle portion) of the injection cylinder 6 to press against the fixed mold 2, while the forward speed setting device 14 sets the pressing force for pressing the injection cylinder 6 forward. At the same time as the speed is set, the retraction speed of the injection cylinder 6 is also set from the retraction speed setting device 15.

型締め装置によって型締めが完了すると、スイッチ14
aが閉じられ、設定前進速度がサーボアンf12に入力
される。サーボアンプ12はまずこの設定前進速度に対
応する電流信号をモータ11に出力し、これによってサ
ーボモータ11が回転駆動される。サーボモータ11の
回転駆動によって歯車10を介して歯車8がネジナツト
9とともに回転する。aJ−゛、          
、歯車8の回転によって、ネジ軸7は軸方向(左方向)
に移動する。この結果、射出シリンダ6は実線矢印で示
す方向に前進する。
When the mold clamping device completes mold clamping, the switch 14
a is closed, and the set forward speed is input to the servo amplifier f12. The servo amplifier 12 first outputs a current signal corresponding to this set forward speed to the motor 11, and the servo motor 11 is thereby rotationally driven. The gear 8 rotates together with the screw nut 9 via the gear 10 due to the rotational drive of the servo motor 11 . aJ-゛,
, due to the rotation of the gear 8, the screw shaft 7 moves in the axial direction (to the left)
Move to. As a result, the injection cylinder 6 moves forward in the direction shown by the solid arrow.

前述のようにサーボモータ11の回転速度がサーボアン
f12にフィードバックされておシワサーボアンプ12
ではこの回転速度に対応する前進速度と設定前進速度と
を比較して、サーボモータ11への出力電流を増減する
。即ち、射出シリンダ6の前進速度を設定値に維持する
As mentioned above, the rotational speed of the servo motor 11 is fed back to the servo amplifier f12 and the wrinkle servo amplifier 12 is fed back to the servo amplifier f12.
Then, the forward speed corresponding to this rotational speed is compared with the set forward speed, and the output current to the servo motor 11 is increased or decreased. That is, the forward speed of the injection cylinder 6 is maintained at the set value.

射出シリンダ6が固定プラテン1に設けられた連通路を
通って固定金型2に接触すると、サーボモータ11にか
かる負荷が増大する。その結果。
When the injection cylinder 6 comes into contact with the fixed mold 2 through the communication path provided in the fixed platen 1, the load applied to the servo motor 11 increases. the result.

サーボモータ11の回転数が低下し1回転が停止状態と
なる。その結果、サーボアンプ12がらの出力電流が増
大して、サーボモータ11のトルクが増加する。従って
、射出シリンダ6による固定金型2への押圧力、即ち、
ノズルタッチ力は増加する。このノズルタッチ力は歯車
8及び1oの減速比とネジ軸7のピッチとで定められる
比例定数によシサーがモータ11のトルクと比例する。
The rotation speed of the servo motor 11 decreases, and one rotation is stopped. As a result, the output current from the servo amplifier 12 increases, and the torque of the servo motor 11 increases. Therefore, the pressing force against the fixed mold 2 by the injection cylinder 6, that is,
Nozzle touch force increases. This nozzle touch force is proportional to the torque of the scissor motor 11 by a proportionality constant determined by the reduction ratio of the gears 8 and 1o and the pitch of the screw shaft 7.

サーボアンプ12はサーボモータ11を回転させるべく
、出力電流を増大させ、その結果サーボモータ11のト
ルクはさらに増加する。ところで。
The servo amplifier 12 increases the output current to rotate the servo motor 11, and as a result, the torque of the servo motor 11 further increases. by the way.

押圧設定器14からは設定ノズルタッチ力に対応する電
流指令値(電流制限値)がサーボアンプ12に入力され
ている。従って、サーボアンプ12からの出力電流が電
流指令値に対応する値まで増加した時点で、サーボアン
プ12は電流の増加を停止する。即ち、サーがアンプ1
2は電流指令値に対応する値に出力電流を維持する。サ
ーボモータ11は上記の出力電流に対応するトルクを出
力し、これによって、射出シリンダ6のノズル部は上記
の設定ノズルタッチ力で固定金型2を押圧する。その後
、射出シリンダ6からキャビティに溶融樹脂が射出され
る。
A current command value (current limit value) corresponding to the set nozzle touch force is input from the press setting device 14 to the servo amplifier 12. Therefore, when the output current from the servo amplifier 12 increases to a value corresponding to the current command value, the servo amplifier 12 stops increasing the current. In other words, sir is amplifier 1
2 maintains the output current at a value corresponding to the current command value. The servo motor 11 outputs a torque corresponding to the above output current, so that the nozzle portion of the injection cylinder 6 presses the fixed mold 2 with the above set nozzle touch force. Thereafter, molten resin is injected from the injection cylinder 6 into the cavity.

射出シリンダ6を後退する際には、スイッチ14aを開
くとともに、スイッチ15aを閉じる。
When retracting the injection cylinder 6, the switch 14a is opened and the switch 15a is closed.

後退速度設定器15からの設定後退速度は前進速度設定
器14からの設定前進速度とは異符号となっている。従
って、サーがアンf12は前進の際とは異符号の電流を
出力し、サーボモータ11が逆転して、射出シリンダ6
は破線矢印で示すように所定の後退位置まで後退する。
The set reverse speed from the reverse speed setter 15 has a different sign from the set forward speed from the forward speed setter 14. Therefore, the servo motor 11 outputs a current with a different sign from that during forward movement, and the servo motor 11 reverses, causing the injection cylinder 6
is retreated to a predetermined retreat position as shown by the dashed arrow.

射出シリンダ6が固定金型2を押圧するノズルタッチ力
を変える際には、押圧力設定器13からの設定ノズルタ
ッチ力を変えればよく、金型及び樹脂の種類に応じて変
わる樹脂反力に容易に対応することができる。
When changing the nozzle touch force with which the injection cylinder 6 presses the fixed mold 2, it is only necessary to change the set nozzle touch force from the pressing force setting device 13, and the resin reaction force that changes depending on the type of mold and resin can be changed. It can be easily handled.

(発明の効果) 以上説明したように2本発明によれば、電動機(サーボ
モータ)のトルクによって射出シリンダの押圧力を発生
させ、しかもこの押圧力は押圧力設定器によって容易に
変えることができるから。
(Effects of the Invention) As explained above, according to the present invention, the pressing force of the injection cylinder is generated by the torque of the electric motor (servo motor), and this pressing force can be easily changed using the pressing force setting device. from.

射出シリンダによる金型の押圧力調整が極めて容易であ
るという利点がある。
This has the advantage that it is extremely easy to adjust the pressing force of the mold by the injection cylinder.

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

第1図は本発明による射出成形機の一実施例の要部を示
す図である。 1・・・固定プラテン、2・・・固定金型、3・・・可
動金型、4・・・可動プラテン、5・・・ホッパー、6
・・・射出シリンダ、7・・・ネジ軸、8.10・・・
歯車、9・・・ネジナツト、11・・・サーボモータ、
12・・・サーボアンプ、13・・・押圧力設定器、1
4・・・前進速度設定器、15・・・後退速度設定器。
FIG. 1 is a diagram showing essential parts of an embodiment of an injection molding machine according to the present invention. 1... Fixed platen, 2... Fixed mold, 3... Movable mold, 4... Movable platen, 5... Hopper, 6
...Injection cylinder, 7...Screw shaft, 8.10...
Gear, 9...screw nut, 11...servo motor,
12... Servo amplifier, 13... Pressing force setting device, 1
4... Forward speed setting device, 15... Reverse speed setting device.

Claims (1)

【特許請求の範囲】[Claims] 1、金型内に形成されたキャビティに溶融樹脂を射出す
る射出シリンダと、該射出シリンダを前記金型に対して
前進及び後退させるための電動機とを有する射出成形機
において、前記射出シリンダ先端部の前記金型への押圧
力を設定する押圧力設定手段と、前記射出シリンダ先端
部が前記金型に接触すると、前記押圧力設定手段で設定
された押圧力に基づいて前記電動機のトルクを制御する
制御手段とを有することを特徴とする射出成形機。
1. In an injection molding machine that has an injection cylinder that injects molten resin into a cavity formed in a mold, and an electric motor that moves the injection cylinder forward and backward with respect to the mold, the injection cylinder tip part a pressing force setting means for setting a pressing force on the mold; and when the tip of the injection cylinder comes into contact with the mold, controlling the torque of the electric motor based on the pressing force set by the pressing force setting means. An injection molding machine comprising: a control means for controlling the injection molding machine;
JP30178286A 1986-12-19 1986-12-19 Injection molding machine Pending JPS63154320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30178286A JPS63154320A (en) 1986-12-19 1986-12-19 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30178286A JPS63154320A (en) 1986-12-19 1986-12-19 Injection molding machine

Publications (1)

Publication Number Publication Date
JPS63154320A true JPS63154320A (en) 1988-06-27

Family

ID=17901107

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30178286A Pending JPS63154320A (en) 1986-12-19 1986-12-19 Injection molding machine

Country Status (1)

Country Link
JP (1) JPS63154320A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012011817A1 (en) 2011-06-21 2012-12-27 Fanuc Corporation Control device for pressing of spray nozzle in injection molding machine, has torque limiter which limits torque of servomotor to limit value that is smaller than pressing force of nozzle, during maximum compression of spring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012011817A1 (en) 2011-06-21 2012-12-27 Fanuc Corporation Control device for pressing of spray nozzle in injection molding machine, has torque limiter which limits torque of servomotor to limit value that is smaller than pressing force of nozzle, during maximum compression of spring
DE102012011817B4 (en) 2011-06-21 2019-09-05 Fanuc Corporation CONTROL DEVICE FOR ANDING BACK A SPRAY NOZZLE IN AN INJECTION MOLDING MACHINE

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