JPS642499B2 - - Google Patents
Info
- Publication number
- JPS642499B2 JPS642499B2 JP2886179A JP2886179A JPS642499B2 JP S642499 B2 JPS642499 B2 JP S642499B2 JP 2886179 A JP2886179 A JP 2886179A JP 2886179 A JP2886179 A JP 2886179A JP S642499 B2 JPS642499 B2 JP S642499B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- injection
- injection plunger
- signal
- plunger
- 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 36
- 239000007924 injection Substances 0.000 claims description 36
- 238000001746 injection moulding Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 241000723353 Chrysanthemum Species 0.000 description 1
- 235000005633 Chrysanthemum balsamita Nutrition 0.000 description 1
- 238000010137 moulding (plastic) Methods 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】
本発明はプラスチツク成形機の射出成形機の射
出プランジヤ速度制御に係り、特に同プランジヤ
速度に関して速度パターンを各シヨツト毎に均一
安定化させて、成形品の品質を向上せしめるよう
にした射出プランジヤ速度の制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to injection plunger speed control of an injection molding machine for a plastic molding machine, and in particular, to improve the quality of molded products by uniformly stabilizing the speed pattern for each shot regarding the plunger speed. The present invention relates to an injection plunger speed control device as described above.
射出成形機によるプラスチツク成形品の品質を
向上せしめるため近来射出工程中の射出プランジ
ヤ速度を制御しようとする技術思想がすでに提案
されている。この思想を具体化したものとして
は、例えば射出プランジヤのストローク方向の適
宜位置にリミツトスイツチを配設して射出プラン
ジヤと一体に移動されるように取付けられたドツ
グがある位置に設けられたリミツトスイツチLS
をONせしめた時、射出プランジヤ駆動用のシリ
ンダへの油流量をその位置に対応した油流量に変
更することにより射出プランジヤの速度をそれま
でと異なるように段階状に速度制御している。 In order to improve the quality of plastic molded products produced by injection molding machines, technical ideas have recently been proposed to control the injection plunger speed during the injection process. A concrete example of this idea is, for example, a limit switch LS that is installed at an appropriate position in the stroke direction of the injection plunger and a dog that is attached so as to be moved together with the injection plunger.
When turned on, the injection plunger speed is controlled in stages by changing the oil flow rate to the cylinder for driving the injection plunger to the oil flow rate corresponding to that position.
又上記の場合で更にドツグ、リミツトスイツチ
方式をラツクピニオン方式に変え同ピニオンギヤ
にポテンシヨメータを結合してプランジヤのスト
ローク位置に対応したアナログ電圧を発生させ、
同アナログ電圧を各ストローク位置に対応して予
じめ設定された電圧と比較してその一致信号によ
り前述の油流量変更信号としているものもある。 Furthermore, in the above case, the dog/limit switch system is changed to a rack pinion system, a potentiometer is connected to the same pinion gear, and an analog voltage corresponding to the stroke position of the plunger is generated.
Some oil pumps compare the same analog voltage with preset voltages corresponding to each stroke position and use the matching signal as the oil flow rate change signal.
しかしかかる速度制御は溶融樹脂を射出プラン
ジヤで送出していく過程で、射出プランジヤの設
定された位置に於ける実速度は設定速度とは応々
にして異なり各シヨツト毎の速度パターンは設定
する速度パターンと同一のものとならず不安定な
ものであつた。 However, such speed control is a process in which molten resin is sent out by an injection plunger, and the actual speed at the set position of the injection plunger varies from the set speed, and the speed pattern for each shot is the set speed. It was not the same as the pattern and was unstable.
しかしながら、最近の成形品に対する要求は一
層きびしくなつている。例えば、速度切換え位置
の設定についても高精度のアナログ電圧発生器が
必要であり、且つ又切換位置の個数が１ストロー
ク中で多数（７〜８個以上）要求されるとか更に
それらの切換位置自体が成形サイクル毎に遠隔的
に修正できることが要求される等々の如くであ
る。 However, recent demands on molded products have become more stringent. For example, a high-precision analog voltage generator is required to set the speed switching position, and a large number of switching positions (7 to 8 or more) are required in one stroke, and the switching positions themselves are required. For example, it may be necessary to be able to remotely modify each molding cycle.
結局こうしたプラスチツク成形品に対する品質
の均一性や同一成形品に対する形状寸法誤差のて
い減等の高まる要求に対しては速度制御装置全体
のコストの点をも考慮すると同制御装置全体を従
来のアナログ方式で構成することには種々の困難
さを伴うことになる。 In the end, in response to the increasing demands for uniformity of quality for plastic molded products and reduction of shape and size errors for the same molded product, considering the cost of the entire speed control system, the entire speed control system has to be replaced by a conventional analog system. There are various difficulties involved in configuring the system.
本発明はこのような課題を根本的に解決するた
め工作機械等で一般の使用に供されているパルス
を発生するリニアスケールを用いて射出中の射出
プランジヤの微少な移動量毎にパルスを発生せし
めてプランジヤ位置を検出し、これにより実速度
をアナログ値に変換して設定速度を同一パルスが
得られるように速度閉ループ制御をする制御装置
を提供せんとするものである。 In order to fundamentally solve these problems, the present invention uses a linear scale that generates pulses, which is commonly used in machine tools, etc., to generate a pulse every minute movement of the injection plunger during injection. It is an object of the present invention to provide a control device that at least detects the plunger position, converts the actual speed into an analog value, and performs speed closed-loop control so that the same pulse is obtained for the set speed.
以下図面により上述の制御装置を説明する。 The above control device will be explained below with reference to the drawings.
第１図において射出成形機のスクリユ１１の右
端部にはスラスト軸受１２を介して、射出シリン
ダ１３から突出している射出プランジヤの軸１４
が結合されており、更に同軸１４と一体的にＸ方
定（射出プランジヤのストローク方向）に移動さ
れるよう取付けられている位置検出ヘツド１５
が、リニアスケール１６と対向して配置されてお
り、射出プランジヤの軸１４の移動に伴い同検出
ヘツド１５からはパルスPTが発生される。尚ス
クリユ１１は上述した射出プランジヤの移動と独
立にスプライン結合部１７、減速歯車列１８を介
してモータＭにより回転される。２１は電磁比例
流量制御弁で射出プランジヤ軸１４の右行程、左
行程に対応した電気信号RMV、LMVが入力さ
れると共に速度制御装置３１からの制御信号によ
つて前記射出シリンダ１３への流量を調節して前
記スクリユ１１の速度を任意に変化させることが
可能である。 In FIG. 1, a shaft 14 of an injection plunger protrudes from an injection cylinder 13 via a thrust bearing 12 at the right end of a screw 11 of an injection molding machine.
A position detection head 15 is coupled to the coaxial head 14 and is mounted so as to be moved integrally with the coaxial 14 in the X direction (the stroke direction of the injection plunger).
is disposed facing the linear scale 16, and a pulse PT is generated from the detection head 15 as the shaft 14 of the injection plunger moves. Incidentally, the screw 11 is rotated by the motor M via the spline joint 17 and the reduction gear train 18 independently of the movement of the injection plunger described above. Reference numeral 21 denotes an electromagnetic proportional flow control valve, which receives electric signals RMV and LMV corresponding to the right stroke and left stroke of the injection plunger shaft 14, and controls the flow rate to the injection cylinder 13 according to a control signal from the speed control device 31. It is possible to arbitrarily change the speed of the screw 11 by adjustment.
前記制御部３１には検出ヘツド１５から与えら
れるパルスPTによつて入力されると共に射出プ
ランジヤ１４の左行程中における移動速度Viを
変化せしめる速度切換位置Xiの設定部３−１と
同設定部３１−１から与えられる速度切換位置信
号Ｓ（Xi）が与えられた以後のストローク中の移
動指令速度に対応した設定速度信号Viを発生す
る速度信号設定部３１−２と同設定速度信号Vi
をアナログの設定速度信号に変換するＤ／Ａ変換
器３１−３と、一方、位置フイードバツク信号用
のパルス列PTを計数して実速度をパルス周波数
に比例したアナログ電圧に変換するＦ／Ｖコンバ
ータ３１−４とが設けられている。更に制御装置
３１には前記Ｄ／Ａ変換器３１−３、Ｆ／Ｖコン
バータ３１−４によつてアナログ値に変換された
設定速度信号と実速度信号が入力されてその差を
算出して実速度が設定速度となるように制御信号
を送出する比較制御部３１−５及びその出力を前
述した電気信号RMV，LMVに変換する増幅部
３１−６が設けられている。又制御装置３１に入
力されている信号群Ｓ，Ｇは増幅部３１−６に於
ける射出プランジヤ軸１４の左行程中か右行程中
かを示すシーケンス信号や前記速度切換位置設定
部３１−１に於ける設定値Xiを修正するための
指令信号（修正値を含む）等が与えられる。これ
らの信号群Ｓ，Ｇの発生部については省略する。 The control section 31 is inputted by the pulse PT given from the detection head 15, and also has a speed switching position setting section 3-1 and a setting section 31 for changing the moving speed Vi of the injection plunger 14 during the left stroke. The speed signal setting unit 31-2 generates the set speed signal Vi corresponding to the movement command speed during the stroke after the speed switching position signal S(Xi) given from -1 is given.
a D/A converter 31-3 that converts the signal into an analog set speed signal, and an F/V converter 31 that counts the pulse train PT for the position feedback signal and converts the actual speed into an analog voltage proportional to the pulse frequency. -4 is provided. Further, the control device 31 receives the set speed signal and the actual speed signal converted into analog values by the D/A converter 31-3 and the F/V converter 31-4, calculates the difference between them, and executes the actual speed signal. A comparison control section 31-5 that sends out a control signal so that the speed becomes the set speed, and an amplification section 31-6 that converts the output into the electrical signals RMV and LMV described above are provided. The signal groups S and G input to the control device 31 are sequence signals indicating whether the injection plunger shaft 14 is in the left stroke or right stroke in the amplifying section 31-6 and the speed switching position setting section 31-1. A command signal (including a correction value), etc. for correcting the set value Xi in is given. The generating portions of these signal groups S and G will be omitted.
第２図は射出行程（左行程）中の射出プランジ
ヤ軸１４の位置と速度との関係を示す。プランジ
ヤの左行程中の速度切換位置X1，X2，X3，X4，
X5に対しては速度信号V3，V2，V4，V1がそれぞ
れ対応している。 FIG. 2 shows the relationship between the position and speed of the injection plunger shaft 14 during the injection stroke (left stroke). Speed switching position during left stroke of plunger X 1 , X 2 , X 3 , X 4 ,
Speed signals V 3 , V 2 , V 4 , and V 1 correspond to X 5 , respectively.
第３図は第１図の速度切換位置設定部３１−１
及び速度信号設定部３１−２の構成を更に詳しく
説明するものでその他の構成については第１図と
同一である。 Figure 3 shows the speed switching position setting section 31-1 in Figure 1.
The configuration of the speed signal setting section 31-2 will be explained in more detail, and the other configurations are the same as those in FIG. 1.
３１−１Ａは速度切換位置Xiをそれぞれ数値
設定できるレジスタ群（R1〜R8）である。３１
−１Ｂは計数器であつて検出ヘツド１５からのパ
ルス列PTを計数する。３１−１Ｃは比較器群で
あつて上述の各設定値XiレジスタＲの内容と計
数器３１−１Ｂのそれとが比較され一致したとき
速度切換位置信号Ｓ（Xi）が速度信号設定部３１
−２へ与えられる。 31-1A is a register group (R 1 to R 8 ) in which each speed switching position Xi can be set numerically. 31
-1B is a counter that counts the pulse train PT from the detection head 15. 31-1C is a comparator group, which compares the contents of each set value Xi register R with that of the counter 31-1B, and when they match, the speed switching position signal S(Xi) is sent to the speed signal setting section 31.
−2 is given.
速度信号設定部３１−２に於て３１−２Ａは各
速度切換位置の間の移動速度を設定する設定値入
力部、３１−２Ｂは選択ゲート回路で入力部３１
−２Ａで設定した各設定値が切換位置信号Ｓ
（Xi）により選択されるようになつている。 In the speed signal setting section 31-2, 31-2A is a set value input section for setting the moving speed between each speed switching position, and 31-2B is a selection gate circuit that inputs the input section 31.
-2A each set value is the switching position signal S
(Xi).
以上説明したように射出プランジヤ移動速度の
制御装置による射出工程における位置をデイジイ
タル量で発生せしめ、且つこれに対応して各速度
切換位置をサムホイールスイツチ、デイジイスイ
ツチ等で一旦レジスタR1，R2……に設定させた
後第３図の点線で示すように成形機の射出装置と
は別の集中制御しうる位置での修正指令値信号
SG1，SG2等によりその値を自動的に増減させる
ことが可能であり、射出成形機中の樹脂温度、粘
度、圧力等の射出成形条件を各シヨツト毎に計測
しそれにもとづいて射出速度切換位置を逐次自動
的に修正することが可能となつた。従来のアナロ
グ方式ではこのようなことは多数個のポテンシヨ
メータに対する回動部が必要となりコストや到達
精度又は寿命の点で実際的ではない。 As explained above, the position in the injection process is generated by the injection plunger moving speed control device in digitized quantities, and correspondingly, each speed switching position is once set in registers R 1 and R 2 using a thumbwheel switch, daisy switch, etc. After setting ......, as shown by the dotted line in Figure 3, the corrected command value signal is sent at a location that can be centrally controlled, separate from the injection device of the molding machine.
It is possible to automatically increase or decrease the value using SG 1 , SG 2, etc., and the injection molding conditions such as resin temperature, viscosity, and pressure in the injection molding machine are measured for each shot, and the injection speed is changed based on that. It has become possible to automatically correct the position sequentially. In the conventional analog system, this requires rotating parts for a large number of potentiometers, which is impractical in terms of cost, accuracy, and service life.
又同様なことは速度信号設定部３１−２Ａに対
しても実施される。即ち、同設定部３１−２Ａで
設定される速度値はレジスタにストアされるがこ
のストアされた値を前述の成形条件をもとづいて
逐次自動的に増減せしめることが容易に実現でき
る。 The same thing is also done for the speed signal setting section 31-2A. That is, the speed value set by the setting section 31-2A is stored in a register, and it is easily possible to automatically increase or decrease this stored value one by one based on the above-mentioned molding conditions.
又本発明においては速度のフイードバツククロ
ーズドループ（速度閉ループ制御）を形成し検出
ヘツドからのパルス列PTを比較制御部３１−３
に入れているので切換えられた速度設定値に対し
射出プランジヤは良好に追従することになり、射
出速度パターンが設定する速度パターンに安定す
るので成形品が設定した速度で成形され品質が安
定向上する。 In addition, in the present invention, a speed feedback closed loop (velocity closed loop control) is formed and the pulse train PT from the detection head is compared with the control section 31-3.
Since the injection plunger follows the changed speed setting value well, the injection speed pattern is stabilized at the set speed pattern, so the molded product is molded at the set speed and the quality is stably improved. .
第１図は本発明を概略的に示すブロツク図、第
２図は射出工程における速度曲線を示す図、第３
図は第１図の要部を詳細に説明する図である。
１１……スクリユ、１２……スラスト軸受、１
３……油圧シリンダ、１４……軸、１５……検出
ヘツド、１６……リニアスケール、１７……スプ
ライン、１８……減速歯車列、２１……電磁比例
流量制御弁、３１……速度制御装置、３１−１…
…速度切換位置設定部、３１−２……速度信号設
定部、３１−３……Ｄ／Ａ変換器、３１−４……
Ｆ／Ｖコンバータ、３１−５……比較制御部、３
１−６……パワー増幅部。
Figure 1 is a block diagram schematically showing the present invention, Figure 2 is a diagram showing the speed curve in the injection process, and Figure 3 is a diagram showing the speed curve in the injection process.
The figure is a diagram illustrating the main parts of FIG. 1 in detail. 11... Screw, 12... Thrust bearing, 1
3... Hydraulic cylinder, 14... Shaft, 15... Detection head, 16... Linear scale, 17... Spline, 18... Reduction gear train, 21... Electromagnetic proportional flow control valve, 31... Speed control device , 31-1...
...Speed switching position setting section, 31-2...Speed signal setting section, 31-3...D/A converter, 31-4...
F/V converter, 31-5... Comparison control section, 3
1-6...Power amplification section.
Claims (1)
シリンダと、前記油圧シリンダに供給される圧力
油の流量を調節する流量制御弁と、前記射出プラ
ンジヤの単位移動量毎にパルスを発生するデイジ
イタル式位置検出器と、前記位置検出器の位置に
対応して前記射出プランジヤの位置と同位置に対
応する移動速度をパルス列で設定可能な速度切換
位置設定部及び速度信号設定部と前記速度切換位
置における速度設定値をアナログ速度設定値に変
換するＤ／Ａ変換器と、前記デイジイタル式位置
検出器からのパルスを周波数に比例した電圧に変
換してアナログの実速度に変換するＦ／Ｖコンバ
ータと前記Ｄ／Ａ変換されたアナログ速度設定値
とＦ／Ｖコンバータで変換されたアナログの実速
度との差を比較演算して設定速度に等しくなるよ
うに前記流量制御弁に制御信号を供給する比較制
御部とを備えた射出成形機の射出プランジヤ速度
制御装置。1. A hydraulic cylinder that moves the injection plunger forward and backward in the injection direction, a flow control valve that adjusts the flow rate of pressure oil supplied to the hydraulic cylinder, and a digital position detector that generates a pulse for each unit movement of the injection plunger. and a speed switching position setting section and a speed signal setting section capable of setting a moving speed corresponding to the same position as the injection plunger position in accordance with the position of the position detector, and a speed setting value at the speed switching position. an F/V converter that converts the pulse from the digital position detector into a voltage proportional to the frequency and converts it into an analog actual speed, and the D/A a comparison control unit that compares and calculates the difference between the converted analog speed set value and the analog actual speed converted by the F/V converter and supplies a control signal to the flow rate control valve so that the speed becomes equal to the set speed; Injection plunger speed control device for injection molding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2886179A JPS55121037A (en) | 1979-03-13 | 1979-03-13 | Speed control system for injection plunger in injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2886179A JPS55121037A (en) | 1979-03-13 | 1979-03-13 | Speed control system for injection plunger in injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55121037A JPS55121037A (en) | 1980-09-17 |
| JPS642499B2 true JPS642499B2 (en) | 1989-01-17 |
Family
ID=12260152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2886179A Granted JPS55121037A (en) | 1979-03-13 | 1979-03-13 | Speed control system for injection plunger in injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55121037A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58131046A (en) * | 1982-01-30 | 1983-08-04 | Toho Kikai Kogyo Kk | Method of discharging liquid by digital control and discharging device thereof |
| JPS6099470A (en) * | 1983-11-01 | 1985-06-03 | Ube Ind Ltd | Method for controlling flow rate of injection cylinder |
| JPS6161819A (en) * | 1984-09-04 | 1986-03-29 | Fanuc Ltd | Control system of speed of injection shaft in injection molding machine |
| JPS6383404A (en) * | 1986-09-22 | 1988-04-14 | Tokyo Keiki Co Ltd | Speed control device for hydraulic actuator |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3440932A (en) * | 1967-03-01 | 1969-04-29 | Eduard Julievich Gutnikov | Plunger travel speed governing devices to be employed when pressing on hydraulic presses |
| FR1539204A (en) * | 1967-08-03 | 1968-09-13 | Plastimonde | Improvements to the plastic molding process by adjusting the control of the movement of the mold and the injection piston |
| CH510511A (en) * | 1969-06-06 | 1971-07-31 | Buehler Ag Geb | Method and device for processing plasticizable material |
| US3767339A (en) * | 1971-11-01 | 1973-10-23 | Hunkar Instr Dev Labor Inc | Injection molding control |
| US3752363A (en) * | 1971-11-12 | 1973-08-14 | Dorn Plastic Machinery Co Van | Control for injection molding machine |
| JPS4988722A (en) * | 1972-12-26 | 1974-08-24 | ||
| CA1013835A (en) * | 1973-10-19 | 1977-07-12 | Denes B. Hunkar | Injection molding control system |
| JPS5126968A (en) * | 1974-08-29 | 1976-03-05 | Japan Steel Works Ltd | Shashutsuseikeiki no seigyohoho |
| JPS5315220A (en) * | 1976-07-29 | 1978-02-10 | Toshiba Machine Co Ltd | Method of measuring speed of injection plunger |
| JPS5339358A (en) * | 1976-09-24 | 1978-04-11 | Nissei Plastics Ind Co | Injection molding method |
| JPS5392871A (en) * | 1977-01-26 | 1978-08-15 | Toyoda Gosei Kk | Injection speed control appartus |
-
1979
- 1979-03-13 JP JP2886179A patent/JPS55121037A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55121037A (en) | 1980-09-17 |
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