JP2597142B2 - Method and apparatus for controlling dwell pressure of injection molding machine - Google Patents
Method and apparatus for controlling dwell pressure of injection molding machineInfo
- Publication number
- JP2597142B2 JP2597142B2 JP11019788A JP11019788A JP2597142B2 JP 2597142 B2 JP2597142 B2 JP 2597142B2 JP 11019788 A JP11019788 A JP 11019788A JP 11019788 A JP11019788 A JP 11019788A JP 2597142 B2 JP2597142 B2 JP 2597142B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- holding pressure
- signal
- pulse
- waveform
- 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
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
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の保圧工程における保圧圧力制御
方法およびその装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method and an apparatus for controlling a dwell pressure in a dwell step of an injection molding machine.
〈従来技術〉 保圧工程における保圧圧力を第６図に示すように任意
の振幅および周波数のパルス信号６により脈動させ金型
キャビティに対する溶融材料の転写性を充分に確保し、
成形品のストレスを極めて小さくする方法として従来か
ら知られている。<Prior Art> As shown in FIG. 6, the holding pressure in the holding pressure step is pulsated by a pulse signal 6 having an arbitrary amplitude and frequency to sufficiently secure the transferability of the molten material to the mold cavity.
It is conventionally known as a method for extremely reducing the stress of a molded article.
〈発明が解決しようとする課題〉 しかしながら、射出速度が早く、オーバパック気味で
充填工程から保圧工程へ切換った場合、最初のパルスを
正の波形を与えると、金型キャビティ内の充填材料はよ
り高圧になり、金型接合面が開かれて、バリが発生する
こともある。<Problems to be Solved by the Invention> However, when the injection speed is high and the filling process is switched from the filling process to the pressure-holding process due to overpacking, if the first pulse is given a positive waveform, the filling material in the mold cavity is given. Becomes higher pressure, the mold joining surface is opened, and burrs may occur.
本発明の目的は前述の欠点を取除き、オーバパック気
味の場合にはバリが発生しないような保圧圧力を負荷す
る保圧圧力制御方法およびその装置を提供することであ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a dwell pressure control method and a dwell pressure control method that removes the above-mentioned drawbacks and apply a dwell pressure that does not generate burrs in the case of overpacking.
〈課題を解決するための手段〉 前述の目的を達成するため、本発明の充填後のキャビ
ティ内の充填材料の冷却固化に伴う収縮を補う射出成形
機の保圧工程における保圧圧力を任意に定める振幅およ
び周波数のパルス信号により脈動させる方法において、
最初のパルス信号を基準値に対して負の波形にすること
を特徴とする射出成形機の保圧圧力制御方法とした。ま
た、前記パルス信号は時間の経過とともに振幅が減衰す
ることを特徴とした前記請求項１）記載の射出成形機の
保圧圧力制御方法とした。さらに保圧圧力を設定する保
圧圧力設定部と、同設定部の設定値に従って信号を発す
る保圧圧力信号出力部と、パルス波形を設定する波形設
定部と、前記パルス波形設定部の設定波形に従ってパル
ス信号を発する信号発生部と、前記保圧圧力信号出力部
およびパルス信号発生部からの両出力信号により演算を
行い最初のパルス信号を基準値に対して、負の波形で制
御する制御信号を算出する信号演算部と、同信号演算部
からの制御信号により、D/A変換器を介して制御され、
射出成形機の保圧圧力を制御する電磁リリーフ弁を作動
させる駆動部を有し、前記請求項１）記載の方法を行う
ための保圧圧力制御装置とした。<Means for Solving the Problems> In order to achieve the above-mentioned object, the holding pressure in the pressure holding step of the injection molding machine for compensating for the shrinkage due to cooling and solidification of the filling material in the cavity after filling according to the present invention is arbitrarily set. In a method of pulsating with a pulse signal having a predetermined amplitude and frequency,
A holding pressure control method for an injection molding machine is characterized in that the first pulse signal has a negative waveform with respect to a reference value. Further, the pulse signal has an amplitude that attenuates as time elapses, and the holding pressure control method for an injection molding machine according to claim 1), wherein: Further, a holding pressure setting section for setting a holding pressure, a holding pressure signal output section for emitting a signal according to the set value of the setting section, a waveform setting section for setting a pulse waveform, and a setting waveform of the pulse waveform setting section And a control signal for performing a calculation based on both output signals from the pressure-holding pressure signal output unit and the pulse signal generation unit and controlling the first pulse signal with a negative waveform with respect to a reference value. Is controlled via a D / A converter by a signal operation unit for calculating
The apparatus has a drive unit for operating an electromagnetic relief valve for controlling the holding pressure of the injection molding machine, and is a holding pressure control device for performing the method according to claim 1).
〈作用〉 前述のような構成となっているので、保圧工程中の保
圧圧力は、最初のパルス信号が基準に対して負の波形と
なる。<Operation> With the above-described configuration, the holding pressure during the holding pressure step is such that the first pulse signal has a negative waveform with respect to the reference.
〈実施例〉 次に第１図により本発明の１実施例を説明すると、材
料を金型内に充填するに際し、スクリュ又はプランジャ
が後退限Ａから前進し始めると、射出圧力はグラフ１の
ように次第に上昇し、所定圧力P1又は射出開始から定め
られた時間Ｂに達すると充填工程から保圧工程へ切換
り、保圧圧力はグラフ２のように振幅および周波数が一
定の値となるパルス状の圧力が与えられる。その際最初
のパルス波形は基準値P2に対し、負の波形で行う。また
第２図のように保圧工程を時間の経過とともに振幅が減
衰する減衰パルス３とすれば非結晶性の樹脂材料等は冷
却固化していく状況が温度低下に対して同じように低下
していく特性を持つものは固化速度とパルス減衰率を上
手に合せることで必要以上なパルス圧が負荷されず、内
部否が少く出来る。<Embodiment> Next, an embodiment of the present invention will be described with reference to FIG. 1. When filling a material into a mold, when a screw or a plunger starts to advance from a retreat limit A, an injection pressure is as shown in a graph 1. Gradually, and when a predetermined pressure P 1 or a predetermined time B from the start of injection is reached, the process is switched from the filling process to the pressure-holding process, and the pressure at which the pressure and the pressure become constant values as shown in graph 2 Pressure is applied. In that case, the first pulse waveform to the reference value P 2, carried out with a negative waveform. As shown in FIG. 2, if the pressure-holding step is a damping pulse 3 whose amplitude is attenuated with the lapse of time, the state of cooling and solidification of the non-crystalline resin material and the like similarly decreases with a decrease in temperature. For those having the characteristic of increasing, by setting the solidification rate and the pulse decay rate well, an unnecessary pulse pressure is not applied, and the inside / outside can be reduced.
さらに第３図のように固化速度に対しパルス圧の絶対
値を時間とともに徐々に低下させれば（グラフ４で示
す）、前記第２図で説明した実施例と同様な効果が得ら
れ、減衰パルスより簡単な設備で行うことが出来る。Further, if the absolute value of the pulse pressure is gradually decreased with time with respect to the solidification rate as shown in FIG. 3 (shown in graph 4), the same effect as the embodiment described in FIG. It can be performed with simpler equipment than pulse.
さらに、固化速度が早いものについては、保持圧力の
かけすぎによる製品の内部歪の発生を防ぐため、第４図
グラフ５で示すようにパルス圧の絶対値を時間と共に減
少させることに加え、振幅も同時に時間の経過とともに
減衰させると良い。Further, in the case where the solidification rate is high, in order to prevent occurrence of internal distortion of the product due to excessive application of the holding pressure, in addition to decreasing the absolute value of the pulse pressure with time as shown in FIG. At the same time, it may be attenuated over time.
そして、その装置について第５図により説明すると、
11は射出成形機の射出装置で、加熱シリンダ12の内径面
にはスクリュ13が回転可能にかつ、所定区間だけ進退可
能に挿着されていて、ホッパ14から供給された材料樹脂
をスクリュ13の回転による推進力により、加熱シリンダ
12に設けた加熱装置（図示せず）により溶融させながら
スクリュ13の前方へ蓄積し、所定量蓄積されると射出シ
リンダ15により、スクリュ13が前進（図中左方向）し、
スクリュ13の前方に蓄積されている溶融された材料樹脂
はノズル16の先端から金型17内のキャビティ18へ注入さ
れる。19は前記射出シリンダ15へ作用する圧油の流量を
制御する電磁流量制御弁、20は電磁リリーフ弁で、前記
射出シリンダ15に作用する圧油の圧力を制定するもので
ある。21は保圧圧力を設定する圧力設定装置、22は前記
圧力設定装置21に設定した圧力を出力する保圧信号出力
部である。23はパルス波形を設定するパルス波形設定
部、24は前記パルス波形設定部23に設定したパルス波形
を出力するパルス信号発生部である。25は信号演算部で
保圧信号出力部22およびパルス信号発生部24からの両信
号により演算を行い、保圧工程における保圧圧力を算出
し、最初のパルス信号を基準値に対し負の波形で制御す
る制御信号としてD/A変換器26および駆動部27を介し
て、電磁リリーフ弁20に作用するようになっている。The device will be described with reference to FIG.
Reference numeral 11 denotes an injection device of an injection molding machine.A screw 13 is rotatably mounted on the inner diameter surface of a heating cylinder 12 so as to be able to advance and retreat only in a predetermined section. Heating cylinder by the propulsive force of rotation
While being melted by a heating device (not shown) provided in 12, the screw 13 accumulates in front of the screw 13. When a predetermined amount is accumulated, the screw 13 moves forward (leftward in the figure) by the injection cylinder 15,
The molten material resin accumulated in front of the screw 13 is injected into the cavity 18 in the mold 17 from the tip of the nozzle 16. Reference numeral 19 denotes an electromagnetic flow control valve for controlling the flow rate of the pressure oil acting on the injection cylinder 15, and reference numeral 20 denotes an electromagnetic relief valve for establishing the pressure of the pressure oil acting on the injection cylinder 15. Reference numeral 21 denotes a pressure setting device for setting the holding pressure, and reference numeral 22 denotes a holding pressure signal output unit for outputting the pressure set in the pressure setting device 21. 23 is a pulse waveform setting unit for setting a pulse waveform, and 24 is a pulse signal generation unit for outputting the pulse waveform set in the pulse waveform setting unit 23. Reference numeral 25 denotes a signal operation unit which performs an operation based on both signals from the pressure-holding signal output unit 22 and the pulse signal generation unit 24 to calculate a pressure-holding pressure in the pressure-holding step, and converts the first pulse signal into a negative waveform with respect to a reference value. The control signal acts on the electromagnetic relief valve 20 via the D / A converter 26 and the drive unit 27 as a control signal.
〈発明の効果〉 前述のような構成となっており、もしオーバパック気
味の充填であっても保圧工程における保圧力は、最初の
パルス信号が基準値に対して負の波形から始まるのでバ
リが発生することはない。<Effect of the Invention> The above-described structure is employed, and even if the overpack is slightly filled, the holding pressure in the holding pressure process is reduced because the first pulse signal starts from a negative waveform with respect to the reference value. Does not occur.
第１図ないし第５図は本発明の１実施例を示す図であっ
て、第１図は保圧工程における保圧圧力を振幅および周
波数が一定の値で最初が負の波形で始まるパルス状の圧
力とした例を示す射出圧力と時間の関係のグラフ。第２
図は保圧圧力が時間の経過とともに振幅が減衰するパル
ス状圧力となる例の射出圧力と時間の関係グラフ。第３
図はパルス圧の絶対値を時間とともに低下させる例を示
すグラフ。第４図はパルス圧と絶対値時間とともに減少
させるとともに、振幅も同時に時間とともに減衰させる
例を示すグラフ。第５図は本発明の方法を実施するため
の装置のブロック図、第６図は従来のパルス状保圧圧力
の場合を示すグラフ。 13……スクリュ、15……射出シリンダ、19……電磁流量
制御弁、20……電磁リリーフ弁、21……保圧圧力設定装
置、22……保圧信号出力部、23……パルス波形設定部、
24……パルス信号発生部、25……信号演算部。FIGS. 1 to 5 show an embodiment of the present invention. FIG. 1 shows a holding pressure in a holding process in the form of a pulse having a constant amplitude and frequency and starting with a negative waveform at the beginning. 4 is a graph showing the relationship between the injection pressure and time, showing an example in which the pressure is set as the pressure. Second
The figure is a graph showing the relationship between injection pressure and time in an example in which the holding pressure becomes a pulse-like pressure whose amplitude attenuates with the passage of time. Third
The figure is a graph showing an example in which the absolute value of the pulse pressure is reduced with time. FIG. 4 is a graph showing an example in which the pulse pressure and the absolute value decrease with time, and the amplitude simultaneously decreases with time. FIG. 5 is a block diagram of an apparatus for carrying out the method of the present invention, and FIG. 6 is a graph showing a conventional pulsed pressure. 13 ... screw, 15 ... injection cylinder, 19 ... electromagnetic flow control valve, 20 ... electromagnetic relief valve, 21 ... holding pressure setting device, 22 ... holding pressure signal output part, 23 ... pulse waveform setting Department,
24 pulse signal generator, 25 signal calculator.
Claims (3)
化に伴う収縮を補う射出成形機の保圧工程における保圧
圧力を任意に定める振幅および周波数のパルス信号によ
り脈動させる方法において、最初のパルス信号を基準値
に対して負の波形にすることを特徴とする射出成形機の
保圧圧力制御方法。In a method for pulsating a holding pressure in a holding pressure step of an injection molding machine for compensating for a contraction caused by cooling and solidification of a filling material in a cavity after filling with a pulse signal having an amplitude and a frequency arbitrarily determined, A holding pressure control method for an injection molding machine, wherein a pulse signal has a negative waveform with respect to a reference value.
が減衰することを特徴とした前記請求項１）記載の射出
成形機の保圧圧力制御方法。2. The holding pressure control method for an injection molding machine according to claim 1, wherein the amplitude of said pulse signal decreases with time.
設定部の設定値に従って信号を発する保圧圧力信号出力
部と、パルス波形を設定する波形設定部と、前記パルス
波形設定部の設定波形に従ってパルス信号を発する信号
発生部と、前記保圧圧力信号出力部およびパルス信号発
生部からの両出力信号により演算を行い最初のパルス信
号を基準値に対し負の波形で制御する制御信号を算出す
る信号演算部と、同信号演算部からの制御信号により、
D/A変換器を介して制御され、射出成形機の保圧圧力を
制御する電磁リリーフ弁を作動させる駆動部を有し、前
記請求項１）記載の方法を行うための保圧圧力制御装
置。3. A holding pressure setting section for setting a holding pressure, a holding pressure signal output section for generating a signal in accordance with a set value of the setting section, a waveform setting section for setting a pulse waveform, and the pulse waveform setting section. A signal generation unit for generating a pulse signal according to the set waveform of the unit, and a calculation is performed based on both output signals from the holding pressure signal output unit and the pulse signal generation unit, and the first pulse signal is controlled with a negative waveform with respect to a reference value. A signal operation unit for calculating a control signal, and a control signal from the signal operation unit,
2. A pressure-holding pressure control device for performing the method according to claim 1), further comprising a driving unit controlled via a D / A converter to operate an electromagnetic relief valve for controlling a pressure-holding pressure of the injection molding machine. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11019788A JP2597142B2 (en) | 1988-05-06 | 1988-05-06 | Method and apparatus for controlling dwell pressure of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11019788A JP2597142B2 (en) | 1988-05-06 | 1988-05-06 | Method and apparatus for controlling dwell pressure of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01280524A JPH01280524A (en) | 1989-11-10 |
| JP2597142B2 true JP2597142B2 (en) | 1997-04-02 |
Family
ID=14529510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11019788A Expired - Fee Related JP2597142B2 (en) | 1988-05-06 | 1988-05-06 | Method and apparatus for controlling dwell pressure of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2597142B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2860611B2 (en) * | 1991-02-13 | 1999-02-24 | 株式会社名機製作所 | Injection pressure control device for injection molding machine and control method therefor |
| JP2639625B2 (en) * | 1994-04-15 | 1997-08-13 | 日精樹脂工業株式会社 | Control method and device for injection molding machine |
| JP4659281B2 (en) * | 2001-06-27 | 2011-03-30 | 東芝機械株式会社 | Injection molding drive |
| JP5165728B2 (en) * | 2010-06-18 | 2013-03-21 | 株式会社デンソー | Fuel pressure waveform acquisition device |
-
1988
- 1988-05-06 JP JP11019788A patent/JP2597142B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01280524A (en) | 1989-11-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |