JPH0622824B2 - Injection control method of injection molding machine - Google Patents
Injection control method of injection molding machineInfo
- Publication number
- JPH0622824B2 JPH0622824B2 JP22963785A JP22963785A JPH0622824B2 JP H0622824 B2 JPH0622824 B2 JP H0622824B2 JP 22963785 A JP22963785 A JP 22963785A JP 22963785 A JP22963785 A JP 22963785A JP H0622824 B2 JPH0622824 B2 JP H0622824B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- pressure
- molding machine
- injection molding
- control method
- 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 - Fee Related
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
- B29C45/76—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】 ＜発明の属する技術分野＞ 本発明は射出成形機の充填工程における射出速度又は射
出圧力を制御する射出制御方法に関する。Description: TECHNICAL FIELD The present invention relates to an injection control method for controlling an injection speed or an injection pressure in a filling process of an injection molding machine.
＜従来技術とその欠点＞ 従来のプログラマブル射出成形機においては射出速度や
射出圧力を個々の金型や樹脂材料に合せて設定すること
は経験と熟練を必要とし、非常に面倒であった。<Prior Art and Its Deficiencies> In a conventional programmable injection molding machine, setting the injection speed and the injection pressure according to each mold and resin material requires experience and skill, and is very troublesome.
＜発明の目的＞ 本発明は前述のような欠点を取除き、成形の設定条件を
簡素化し良品成形が出来るように成した。<Purpose of the Invention> The present invention eliminates the above-mentioned drawbacks and simplifies the setting conditions for molding to enable good product molding.
＜発明の要点＞ 前述の目的を達成するため、射出成形機の加熱シリンダ
のスクリュ前進限時における逆流防止弁の位置より下流
側の加熱シリンダ部に第１の圧力検出器を配設し、ノズ
ル部に第２の圧力検出器を配設し、２つの圧力検出器が
検出する圧力の偏差が予め設定した基準値となるよう射
出充填工程の速度制御または圧力制御を行うことを特徴
とする射出成形機の射出制御方法とした。<Main points of the invention> In order to achieve the above-mentioned object, the first pressure detector is arranged in the heating cylinder portion downstream of the position of the check valve at the screw forward time limit of the heating cylinder of the injection molding machine, and the nozzle portion A second pressure detector is provided in the injection molding machine, and speed control or pressure control of the injection filling process is performed so that the deviation between the pressures detected by the two pressure detectors becomes a preset reference value. Machine injection control method.
＜実施例＞ 次に第１図により本発明の１実施例を説明する。１は射
出成形機の加熱シリンダで内径面に不図示の駆動装置に
より軸方向に進退し、かつ軸を中心に回転駆動するスク
リュ２が嵌着されている。前記スクリュ２はホッパ（不
図示）から供給される材料樹脂をスクリュヘッド３の前
方へと移送し、スクリュヘッド３の前方の空隙部４へ一
定量蓄積した後（スクリュ自身は後退位置となる）、空
隙部４へ蓄積した材料樹脂を金型キャビティ５内へ射出
するべく前進限位置まで前進するようになっている。
（図示した位置） この際スクリュ２には材料樹脂のホッパ側へ（図中右方
向）の逆流防止弁６が取付てある。７は前記スクリュ２
の前進限位置にあるとき、逆流防止弁６より下流（図中
左側）側に設けた圧力センサ。８は前記圧力センサより
更に下流に設けた第２の圧力センサである。９は金型キ
ャビティ５と加熱シリンダ１の先端部のノズル孔１０を
結ぶスプルーである。１１は変換器で前記圧力センサ７
で検出した圧力P1と第２の圧力センサ８で検出した圧力
P2を電圧に変換するものである。１２は演算部で前記変
換器１１で変換された圧力P1およびP2を入力とし、P2−
P1を演算し、射出速度又は射出圧力制御部１３へ入力信
号として送るようになっている。この時前記制御部１３
へ予め設定器１５に設定してある圧力偏差値の基準値を
入力し、射出用のサーボ弁または電磁比例弁１４を閉ル
ープ制御するようになっている。<Example> Next, one example of the present invention will be described with reference to FIG. Reference numeral 1 is a heating cylinder of an injection molding machine, and a screw 2 which is axially advanced and retracted by a driving device (not shown) and which is rotationally driven about a shaft is fitted to an inner diameter surface of the cylinder. The screw 2 transfers material resin supplied from a hopper (not shown) to the front of the screw head 3 and accumulates it in a predetermined amount in a space 4 in front of the screw head 3 (the screw itself is in a retracted position). In order to inject the material resin accumulated in the cavity 4 into the mold cavity 5, the material resin is advanced to the advance limit position.
(Position shown) At this time, a check valve 6 is attached to the screw 2 toward the hopper side of the material resin (rightward in the figure). 7 is the screw 2
A pressure sensor provided on the downstream side (left side in the figure) of the check valve 6 when in the forward limit position. Reference numeral 8 is a second pressure sensor provided further downstream from the pressure sensor. Reference numeral 9 is a sprue that connects the mold cavity 5 and the nozzle hole 10 at the tip of the heating cylinder 1. Reference numeral 11 is a converter, which is the pressure sensor 7
The pressure in the detected pressure P 1 has been detected by the second pressure sensor 8
It converts P 2 into voltage. Reference numeral 12 denotes an arithmetic unit, which receives the pressures P 1 and P 2 converted by the converter 11 as input and P 2 −
P 1 is calculated and sent to the injection speed or injection pressure control unit 13 as an input signal. At this time, the control unit 13
The reference value of the pressure deviation value set in advance in the setting device 15 is inputted to the closed loop control of the injection servo valve or the solenoid proportional valve 14.
＜作用効果＞ 以上のように構成されているので射出速度や射出圧力を
一定に保つために、もし仮にP2が圧力上昇したとき、圧
力差を一定にするためP1の圧力が上昇し、P2の圧力低下
があると圧力差を一定に保つためP1も低下し、常に樹脂
の流動は安定し、より円滑な成形が容易に行うことが出
来る。<Effect> Since the above-mentioned structure is adopted, in order to keep the injection speed and the injection pressure constant, if the pressure of P 2 rises, the pressure of P 1 rises to keep the pressure difference constant, When the pressure of P 2 is decreased, the pressure difference is kept constant, so that P 1 is also decreased, the resin flow is always stable, and smoother molding can be easily performed.
また第２図のように第２の圧力センサ８ａ、８ｂを金型
キャビティ５或いはスプルー９へ設けても良い。Further, as shown in FIG. 2, the second pressure sensors 8a and 8b may be provided in the mold cavity 5 or the sprue 9.
以上説明したように、スクリュ前進限における逆流防止
弁より下流の２位置に設けた圧力検出器により圧力偏差
を一定とするよう制御することにより成形条件の設定は
容易となり、溶融樹脂の流れも安定し、円滑に良品成形
が行うことが出来る。As described above, the molding conditions can be set easily and the molten resin flow can be stabilized by controlling the pressure deviation to be constant by the pressure detectors provided at two positions downstream of the check valve at the forward end of the screw. However, it is possible to smoothly perform good product molding.
第１図は本発明の１実施例を示す図、第２図は本発明の
他の実施例を示す図。 １……加熱シリンダ、２……スクリュ、５……キャビテ
ィ、６……逆流防止弁、７……圧力センサ、８……第２
の圧力センサ、９……スプルー、１１……変換器、１２
……演算部、１３……射出速度又は圧力制御部、１５…
…設定器、１４……サーボ弁又は電磁比例弁FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing another embodiment of the present invention. 1 ... Heating cylinder, 2 ... Screw, 5 ... Cavity, 6 ... Backflow prevention valve, 7 ... Pressure sensor, 8 ... Second
Pressure sensor, 9 ... Sprue, 11 ... Transducer, 12
...... Calculation unit, 13 ...... Injection speed or pressure control unit, 15 ・ ・ ・
… Setting device, 14 …… Servo valve or solenoid proportional valve
Claims (1)
限時における逆流防止弁の位置より下流側の前記加熱シ
リンダ部に第１の圧力検出器を配設し、ノズル部に第２
の圧力検出器を配設し、前記２つの圧力検出器が検出す
る圧力の偏差が予め設定した基準値となるよう射出充填
工程の速度制御または圧力制御を行うことを特徴とする
射出成形機の射出制御方法。1. A first pressure detector is provided in the heating cylinder portion downstream of the position of the check valve at the time of screw forward movement of the heating cylinder of the injection molding machine, and a second pressure detector is provided in the nozzle portion.
Of the injection molding machine, the speed control or the pressure control of the injection filling step is performed so that the deviation between the pressures detected by the two pressure detectors becomes a preset reference value. Injection control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22963785A JPH0622824B2 (en) | 1985-10-15 | 1985-10-15 | Injection control method of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22963785A JPH0622824B2 (en) | 1985-10-15 | 1985-10-15 | Injection control method of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6287317A JPS6287317A (en) | 1987-04-21 |
| JPH0622824B2 true JPH0622824B2 (en) | 1994-03-30 |
Family
ID=16895315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22963785A Expired - Fee Related JPH0622824B2 (en) | 1985-10-15 | 1985-10-15 | Injection control method of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0622824B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63249613A (en) * | 1987-04-07 | 1988-10-17 | Komatsu Ltd | Method for controlling injection process in injection molder |
| US5056999A (en) * | 1989-04-25 | 1991-10-15 | Howmet Corporation | Apparatus for forming objects from a moldable material |
| 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 |
| JP2541721B2 (en) * | 1991-12-17 | 1996-10-09 | 日精樹脂工業株式会社 | Molding machine control method and control device |
| WO1994022655A1 (en) * | 1993-04-05 | 1994-10-13 | Procontrol Ag | Injection molding machine with an electric drive and process for guiding the same |
| CH692491A5 (en) * | 1997-04-23 | 2002-07-15 | Kk Holding Ag | Method for determining the Umschlaltpunktes in the manufacture of an injection molded part. |
| JP4500252B2 (en) * | 2005-11-28 | 2010-07-14 | 日精樹脂工業株式会社 | Injection control method and apparatus for injection molding machine |
-
1985
- 1985-10-15 JP JP22963785A patent/JPH0622824B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6287317A (en) | 1987-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |