JPH0444891B2 - - Google Patents
Info
- Publication number
- JPH0444891B2 JPH0444891B2 JP4828886A JP4828886A JPH0444891B2 JP H0444891 B2 JPH0444891 B2 JP H0444891B2 JP 4828886 A JP4828886 A JP 4828886A JP 4828886 A JP4828886 A JP 4828886A JP H0444891 B2 JPH0444891 B2 JP H0444891B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- screw
- speed
- torque
- motor
- 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
Links
- 238000002347 injection Methods 0.000 claims description 41
- 239000007924 injection Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005429 filling process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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】
(イ) 産業上の利用分野
本発明は、電動式射出機の射出制御方法に関す
るもである。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an injection control method for an electric injection machine.
(ロ) 従来の技術
電動式射出機を用いた場合、従来は一般に第３
図に示すように充てん工程から保圧工程への切換
えが行われる。すなわち、充てん工程においては
設定された速度V1，V2及びV3でスクリユーが前
進することによつて金型内に溶融樹脂が充てんさ
れ、スクリユーが保圧切換位置（Ｐ点）まで到達
したときそれまでの電動機の回転速度制御を電動
機のトルク制御に切換え、保圧工程に入る。これ
により、設定されたトルクTH1及びTH2でそれぞ
れ所定時間t1及びt2だけ保圧力の負荷が行われ
る。しかし、電動式射出機の場合には電動機の回
転をボールねじ機構、歯車機構などによつてスク
リユーの前進運動に変換しているので動力伝達部
材の慣性が大きく、保圧切換位置（Ｐ点）で電動
機に対して回転速度制御からトルク制御に切換え
る指令信号が出力されても、設定トルクTH1に対
応した低速度VH1まで減速されず、慣性によりス
クリユーがＱ点まで移動してしまうことになる。
従つて、設定トルクTH1の保圧時間としてはt1時
間が設定されていても実際の保圧時間はt1′しか
ないこととなり、しかも樹脂の溶融状態が変動す
るとＱ点の位置も変動するため安定した成形作業
が行えないという問題点がある。(b) Conventional technology When using an electric injection machine, conventionally the third
As shown in the figure, the filling process is switched to the pressure holding process. That is, in the filling process, the screw advances at set speeds V 1 , V 2 , and V 3 to fill the mold with molten resin, and the screw reaches the holding pressure switching position (point P). At this time, the current motor rotational speed control is switched to motor torque control, and the pressure holding process begins. As a result, the holding force is applied at the set torques T H1 and T H2 for predetermined times t 1 and t 2 , respectively. However, in the case of an electric injection machine, the rotation of the electric motor is converted into the forward movement of the screw using a ball screw mechanism, gear mechanism, etc., so the inertia of the power transmission member is large, and the holding pressure switching position (point P) Even if a command signal is output to the electric motor to switch from rotational speed control to torque control, it will not be decelerated to the low speed V H1 corresponding to the set torque T H1 , and the screw will move to point Q due to inertia. Become.
Therefore, even if t 1 hour is set as the pressure holding time for the set torque T H1 , the actual pressure holding time is only t 1 ', and if the melting state of the resin changes, the position of point Q will also change. Therefore, there is a problem that stable molding operations cannot be performed.
このような問題点を解消することを目的とし
て、特開昭59−224324号公報には、保圧切換位置
（Ｐ点）の直前で電動機を急速に減速する方法が
示されている。 In order to solve this problem, Japanese Patent Application Laid-Open No. 59-224324 discloses a method of rapidly decelerating the electric motor just before the pressure holding switching position (point P).
(ハ) 発明が解決しようとする問題点
しかし、この方法の場合には、電動機を制動し
て急減速させる必要があるため、減速のための制
動エネルギーを必要とするのに加えて、高速で運
動していた電動機、動力伝達部材、スクリユーな
どの慣性エネルギーを吸収し熱として放出する必
要があるため大型の抵抗器が必要となる。このた
め動力損失が大きく、しかも装置の価格が高くな
り、また急制動が作用するため動力伝達部材など
の損耗も激しいという問題点がある。(c) Problems to be solved by the invention However, in the case of this method, it is necessary to brake the electric motor to cause sudden deceleration, and in addition to requiring braking energy for deceleration, A large resistor is required because it is necessary to absorb the inertial energy of the moving electric motor, power transmission member, screw, etc. and release it as heat. Therefore, there are problems in that the power loss is large, the cost of the device is high, and the sudden braking causes severe wear and tear on the power transmission members.
(ニ) 問題点を解決するための手段
本発明は、充てん工程終了時から保圧工程開始
時までの間に、溶融樹脂の充てん抵抗によつて射
出速度を徐々に低下させることにより、上記問題
点を解決する。すなわち、本発明による電動式射
出機の射出制御方法は、溶融樹脂の充てんの際に
はあらかじめ設定された射出速度となるように電
動機の回転速度を制御し、スクリユーが第１位置
まで前進したとき射出用電動機のトルクをあらか
じめ設定された値に制限し、この状態でスクリユ
ーが射出速度を低下させつつ前進し第２位置まで
到達した後で保圧力が設定どおりとなるように射
出用電動機のトルクを制御することを要旨として
いる。(d) Means for solving the problems The present invention solves the above problems by gradually reducing the injection speed due to the filling resistance of the molten resin between the end of the filling process and the start of the pressure holding process. Solve the points. That is, the injection control method for an electric injection machine according to the present invention controls the rotational speed of the electric motor so that a preset injection speed is achieved when filling with molten resin, and when the screw advances to the first position. The torque of the injection motor is limited to a preset value, and in this state, the torque of the injection motor is adjusted so that the screw moves forward while decreasing the injection speed and reaches the second position, so that the holding force is as set. The main point is to control the
(ホ) 作用
充てん工程においては従来と同様に射出用電動
機の回転速度を制御することにより射出速度を制
御する。スクリユーが第１位置（自由減速開始位
置）に到達したとき射出用電動機に投入される電
流値を制御し、所定の制限トルク値となるように
電動機のトルクを制御し、溶融樹脂の充てん抵抗
によつて射出速度を徐々に低下させる。こうして
溶融樹脂の充てん抵抗によつて射出速度を徐々に
低下させつつスクリユーが第２位置（保圧切換位
置）に到達すると、射出用電動機のトルクを制御
する保圧工程を開始する。この時点では射出速度
は十分に低下しているため慣性エネルギーは小さ
く、直ちに設定どおりのトルク制御を開始するこ
とができる。(E) Function In the filling process, the injection speed is controlled by controlling the rotational speed of the injection motor as in the conventional case. When the screw reaches the first position (free deceleration start position), the current value applied to the injection motor is controlled, and the torque of the motor is controlled to a predetermined limit torque value, and the filling resistance of the molten resin is controlled. Therefore, the injection speed is gradually reduced. When the screw reaches the second position (pressure holding switching position) while gradually decreasing the injection speed due to the filling resistance of the molten resin, a pressure holding process for controlling the torque of the injection motor is started. At this point, the injection speed has decreased sufficiently, so the inertial energy is small, and torque control can be started immediately as set.
(ヘ) 実施例
以下、本発明の実施例を添付図面の第１及び２
図に基づいて説明する。(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to Nos. 1 and 2 of the attached drawings.
This will be explained based on the diagram.
射出機のスクリユー１０は、ボールナツト１２
と一体の部材１４に保持されている。ボールナツ
ト１２と組み合わされてボールねじ機構を構成す
るボールねじ１６は射出用電動機１８によつて回
転駆動可能である。射出用電動機１８の回転位置
及び回転速度は位置・速度検出器２０によつて検
出される。射出用電動機１８の回転速度、トル
ク、回転量などは駆動用増幅器２２を介して制御
装置２４によつて制御される。制御装置２４には
前述の位置・速度検出器２０、トルク制限器２
６、及び設定装置２８から信号が入力される。設
定装置２８の信号はトルク制限器２６にも入力さ
れる。設定装置２８には、スクリユー速度を切換
える位置をあらかじめ設定するための速度切換位
置設定器３０ａ，３０ｂ及び３０ｃ、スクリユー
速度をあらかじめ設定するための速度設定器３２
ａ，３２ｂ及び３２ｃ、自由減速開始位置（第１
位置）を設定するための減速開始位置設定器３
４、保圧切換位置（第２位置）を設定するための
保圧切換位置設定器３６、及び射出用電動機１８
の出力トルクの制限値を設定するための制限トル
ク設定器３８を有している。 The screw 10 of the injection machine has a ball nut 12
It is held by a member 14 that is integrated with. A ball screw 16, which constitutes a ball screw mechanism in combination with the ball nut 12, can be rotationally driven by an injection motor 18. The rotational position and rotational speed of the injection motor 18 are detected by a position/speed detector 20. The rotation speed, torque, rotation amount, etc. of the injection motor 18 are controlled by a control device 24 via a drive amplifier 22. The control device 24 includes the aforementioned position/speed detector 20 and torque limiter 2.
6, and a signal is input from the setting device 28. The signal from the setting device 28 is also input to the torque limiter 26 . The setting device 28 includes speed switching position setters 30a, 30b, and 30c for setting in advance the position at which the screw speed is changed, and a speed setting device 32 for setting the screw speed in advance.
a, 32b and 32c, free deceleration start position (first
deceleration start position setter 3 for setting
4. Holding pressure switching position setter 36 for setting the holding pressure switching position (second position), and injection motor 18
It has a limit torque setting device 38 for setting the limit value of the output torque.
次にこの実施例の作用について説明する。図示
してない可塑化用電動機によつてスクリユー１０
が回転駆動され、樹脂材料が可塑化され、溶融樹
脂が所定量たまるまでスクリユー１０が後退す
る。次いで、制御装置２４によつて射出用電動機
１８の作動が制御され、射出用電動機１８の回転
がボールねじ１６及びボールナツト１２によつて
スクリユー１０の直線運動に変換され、スクリユ
ー１０の前進が行われる。その際のスクリユー１
０の前進速度は、設定装置２８の速度切換位置設
定器３０ａ，３０ｂ及び３０ｃ、及び速度設定器
３２ａ，３２ｂ及び３２ｃにあらかじめ設定され
た速度切換位置及び速度によつて制御され、例え
ば第２図に示すように速度V1、V2及びV3の３段
階に制御される。こうしてスクリユー１０が前進
し、減速開始位置設定器３４によつて設定された
自由減速開始位置に達すると（第２図のＲ点）、
制限トルク設定器３８の設定値に従つてトルク制
限器２６から信号が制御装置２４に送られ、射出
用電動機１８への投入電流が制限され、その結果
発生トルクは第２図に示すTcに制限される。こ
のため、スクリユー１０は溶融樹脂の充てん抵抗
を受け、次第にその速度を低下する。スクリユー
１０は速度を低下しつつ前進し、保圧切換位置設
定器３６に設定された保圧切換位置Ｓ点に到達す
る。Ｓ点に到達すると保圧工程が開始され、射出
用電動機１８のトルク制御が行われる。すなわ
ち、トルクTH1の負荷がt1時間行われ、次いでト
ルクTH2の負荷がt2時間行われる。スクリユー１
０がＳ点に到達したときのスクリユー１０の射出
速度Vsを次の保圧工程での設定トルクTH1を負荷
したときの発生速度VH1に近くなるように制限ト
ルクTcを設定しておけば、スクリユー１０の射
出速度は極めて円滑に保圧速度VH1に移行するこ
とができる。従つて、大きな慣性エネルギーによ
るスクリユー１０の移動及びこの移動時間のばら
つきが解消され安定した成形を行うことができ、
成形品の品質のばらつきが大幅に低下する。ま
た、保圧工程直前でスクリユー１０を急減速させ
る必要がないので大きな抵抗器などが不要となつ
て装置の価格が低減され、また動力伝達部材など
に衝撃を与えないのでこれらの部材の寿命を延長
することができる。 Next, the operation of this embodiment will be explained. The screw 10 is operated by a plasticizing electric motor (not shown).
is driven to rotate, the resin material is plasticized, and the screw 10 is retracted until a predetermined amount of molten resin has accumulated. Next, the operation of the injection motor 18 is controlled by the control device 24, and the rotation of the injection motor 18 is converted into a linear motion of the screw 10 by the ball screw 16 and the ball nut 12, so that the screw 10 is moved forward. . Screw 1 at that time
The forward speed of 0 is controlled by the speed switching position and speed preset in the speed switching position setters 30a, 30b, and 30c and the speed setting devices 32a, 32b, and 32c of the setting device 28, for example, as shown in FIG. The speed is controlled in three stages: V 1 , V 2 and V 3 as shown in FIG. When the screw 10 advances in this way and reaches the free deceleration start position set by the deceleration start position setter 34 (point R in FIG. 2),
A signal is sent from the torque limiter 26 to the control device 24 in accordance with the setting value of the limit torque setting device 38, and the current applied to the injection motor 18 is limited, and as a result, the generated torque is limited to Tc shown in FIG. 2. be done. For this reason, the screw 10 is subjected to resistance from filling with the molten resin, and its speed gradually decreases. The screw 10 moves forward while decreasing its speed and reaches the holding pressure switching position S point set in the holding pressure switching position setting device 36. When the S point is reached, the pressure holding process is started and the torque of the injection motor 18 is controlled. That is, the loading of torque T H1 is carried out for t 1 hours, and then the loading of torque T H2 is carried out for t 2 hours. Screw 1
If the limit torque Tc is set so that the injection speed Vs of the screw 10 when 0 reaches the S point is close to the generation speed V H1 when the set torque T H1 is loaded in the next pressure holding process. , the injection speed of the screw 10 can be extremely smoothly shifted to the holding pressure speed V H1 . Therefore, the movement of the screw 10 due to large inertial energy and the variation in the movement time are eliminated, and stable molding can be performed.
Variations in quality of molded products are significantly reduced. In addition, since there is no need to suddenly decelerate the screw 10 immediately before the pressure holding process, there is no need for a large resistor, reducing the cost of the device, and since no shock is applied to power transmission members, the lifespan of these members can be extended. Can be extended.
(ト) 発明の効果
以上説明してきたように、本発明によると、充
てん工程から保圧工程への切換えの際に溶融樹脂
の充てん抵抗によつて射出速度を低下させるよう
にしたので、成形条件を安定させて品質の高い成
形品を得ることができるようになり、また急減速
のための装置費用が不要となり、衝撃が減少する
ので動力伝達部材の寿命も延長される。(G) Effects of the Invention As explained above, according to the present invention, the injection speed is reduced by the filling resistance of the molten resin when switching from the filling process to the pressure holding process, so that the molding conditions can be reduced. This makes it possible to obtain high-quality molded products by stabilizing the process, eliminates the need for equipment for rapid deceleration, and reduces impact, thereby extending the life of the power transmission member.
第１図は本発明の実施例を示す図、第２図は本
発明による射出速度及びトルクの変化を示す図、
第３図は従来の方法による射出速度及びトルクの
変化を示す図である。
１０……スクリユー、１２……ボールナツト、
１６……ボールねじ、１８……射出用電動機、２
０……位置・速度検出器、２４……制御装置、２
６……トルク制限器、２８……設定装置。
FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing changes in injection speed and torque according to the present invention,
FIG. 3 is a diagram showing changes in injection speed and torque according to the conventional method. 10... Screw, 12... Ball Nut,
16... Ball screw, 18... Injection electric motor, 2
0...Position/speed detector, 24...Control device, 2
6...Torque limiter, 28...Setting device.
Claims (1)
御方法において、 溶融樹脂の充てんの際にはあらかじめ設定され
た射出速度となるように電動機の回転速度を制御
し、スクリユーが第１位置まで前進したとき射出
用電動機のトルクをあらかじめ設定された値に制
限し、この状態でスクリユーが射出速度を低下さ
せつつ前進し第２位置まで到達した後で保圧力が
設定どおりとなるように射出用電動機のトルクを
制御することを特徴とする電動式射出機の射出制
御方法。[Claims] 1. In an injection control method for an electric injection machine using an electric motor as a drive source, the rotational speed of the electric motor is controlled to a preset injection speed when filling with molten resin, and the screw When the screw advances to the first position, the torque of the injection motor is limited to a preset value, and in this state, the screw moves forward while decreasing the injection speed, and after reaching the second position, the holding force is maintained as set. 1. An injection control method for an electric injection machine, characterized by controlling the torque of an injection motor so that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4828886A JPS62207622A (en) | 1986-03-07 | 1986-03-07 | Injection controlling of motor-driven injection machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4828886A JPS62207622A (en) | 1986-03-07 | 1986-03-07 | Injection controlling of motor-driven injection machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62207622A JPS62207622A (en) | 1987-09-12 |
| JPH0444891B2 true JPH0444891B2 (en) | 1992-07-23 |
Family
ID=12799249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4828886A Granted JPS62207622A (en) | 1986-03-07 | 1986-03-07 | Injection controlling of motor-driven injection machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62207622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002036325A1 (en) * | 2000-10-31 | 2002-05-10 | Mitsubishi Heavy Industries, Ltd. | Electric injection molding machine and method of controlling injection speed and injection pressure of electric injection molding machine |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141221A (en) * | 1988-11-24 | 1990-05-30 | Matsushita Electric Ind Co Ltd | Control of injection molding machine |
| JPH03213320A (en) * | 1990-01-18 | 1991-09-18 | Fanuc Ltd | Injection device for motorized injection molding machine |
| JPH089191B2 (en) * | 1991-04-30 | 1996-01-31 | 株式会社日本製鋼所 | Control method of electric injection molding machine |
| EP0536449A1 (en) * | 1991-10-10 | 1993-04-14 | AUTOMATISIERUNGS- UND KUNSTSTOFFTECHNIK GmbH CHEMNITZ | Process for one-line-determination of the value for switch-over to downstream pressure for injection moulding |
| JP3266133B2 (en) | 1999-03-11 | 2002-03-18 | 株式会社村田製作所 | Injection molding machine for thermoplastic resin |
-
1986
- 1986-03-07 JP JP4828886A patent/JPS62207622A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002036325A1 (en) * | 2000-10-31 | 2002-05-10 | Mitsubishi Heavy Industries, Ltd. | Electric injection molding machine and method of controlling injection speed and injection pressure of electric injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62207622A (en) | 1987-09-12 |
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