DE10143473A1 - Parameter control in an injection molding process involves using stored values from earlier successful operations to form tolerance areas for an existing operation - Google Patents

Parameter control in an injection molding process involves using stored values from earlier successful operations to form tolerance areas for an existing operation

Info

Publication number
DE10143473A1
DE10143473A1 DE10143473A DE10143473A DE10143473A1 DE 10143473 A1 DE10143473 A1 DE 10143473A1 DE 10143473 A DE10143473 A DE 10143473A DE 10143473 A DE10143473 A DE 10143473A DE 10143473 A1 DE10143473 A1 DE 10143473A1
Authority
DE
Germany
Prior art keywords
injection
injection molding
stored values
cycle
molding process
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.)
Ceased
Application number
DE10143473A
Other languages
German (de)
Inventor
Rupert Moerwald
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.)
Engel Maschinenbau GmbH
Original Assignee
Engel Maschinenbau GmbH
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 Engel Maschinenbau GmbH filed Critical Engel Maschinenbau GmbH
Publication of DE10143473A1 publication Critical patent/DE10143473A1/en
Ceased legal-status Critical Current

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
    • 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
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76006—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76083—Position
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7611—Velocity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/76187—Injection unit screw
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/762—Injection unit injection piston
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76287—Moulding material
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76648—Sequence, e.g. the order in which operations are conducted
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76939—Using stored or historical data sets
    • B29C2945/76943—Using stored or historical data sets compare with thresholds

Landscapes

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

Abstract

The position or speed of an injection piston or screw or the plastic melt pressure is monitored and when the recorded figures(3) exceed a pre-determined deviation(4) from a standard value the control system initiates action to effect correction or stop the cycle. Determination of a normal value is by storing actual values(1,2) of the monitored parameters from molding cycles giving good results. Preferred Features: Stored values(1,2) are determined from a number of prior process cycles. Occasionally a result from an earlier cycle is replaced by one from a later cycle to compensate for natural process variation.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Überwachung des Einspritzvorganges bei einer Spritzgießmaschine, wobei die Position oder Geschwindigkeit des Einspritzkolbens bzw. der Einspritzschnecke oder der Druck im Kunststoff dauernd überwacht und bei Über­ schreiten einer vorbestimmten Abweichung vom Normalwert eine Reaktion ausgelöst wird.The invention relates to a method for monitoring the injection process an injection molding machine, the position or speed of the injection piston or the injection screw or the pressure in the plastic continuously monitored and if over a reaction is triggered if a predetermined deviation from the normal value occurs.

Beim Spritzgießen von Kunststoff wirken viele Komponenten zusammen. Um ein genau reproduzierbares Produkt herzustellen, muß sich zunächst die Maschine selbst in den auf­ einanderfolgenden Zyklen möglichst gleich verhalten, was insbesondere durch Temperatur­ änderungen erschwert wird. Der Zustand der jeweils verwendeten Form wirkt auf den Ein­ spritzvorgang zurück und vor allem ist das in der Dosier- und Plastifiziereinrichtung ver­ arbeitete Granulat nie von absolut gleicher Qualität.Many components work together in the injection molding of plastic. To be exact To produce a reproducible product, the machine must first turn on itself consecutive cycles behave as similar as possible, especially due to temperature changes is difficult. The state of the shape used affects the on injection process back and above all that is ver in the dosing and plasticizing granulate never worked of absolutely the same quality.

Die dargestellte Problematik hat schon früh dazu geführt, daß Verfahren der eingangs definierten Art (vergleiche EP 0 228 799 Japan Steelworks) konzipiert worden sind. Proble­ matisch an diesem bekannten Verfahren ist vor allem die Festlegung eines Normalverlaufes, von dem aus die Zulässigkeit einer festgestellten Abweichung beurteilt wird. Die Erfindung geht hier von der Überlegung aus, daß es ohnehin kaum möglich ist, einen optimalen Kurvenverlauf zu berechnen, sodaß es auch wenig Sinn macht, mit erheblichem Regelauf­ wand die Einhaltung eines solchen theoretisch vorgegebenen Kurvenverlaufs zu erzwingen. Als Kriterium dafür, ob ein bestimmter zeitlicher Verlauf einer wesentlichen Prozeßgröße wie der Geschwindigkeit des Einspritzkolbens oder des Einspritzdrucks akzeptabel ist, wird somit die Qualität des erzeugten Produktes gewählt.The problem presented has led to the fact that the procedure of the beginning defined type (see EP 0 228 799 Japan Steelworks). proble What is particularly important about this known method is the establishment of a normal course, from which the admissibility of a discrepancy is assessed. The invention assumes here that it is hardly possible to find an optimal one anyway To calculate the course of the curve, so that it also makes little sense, with considerable control to enforce compliance with such a theoretically predetermined curve. As a criterion for whether a certain time course of an essential process variable like the speed of the injection piston or the injection pressure is acceptable selected the quality of the product produced.

Erfindungsgemäß ist somit vorgesehen, daß die Bestimmung des Normalwertes erfolgt, indem Istwerte des Verlaufes der überwachten Größe bei gut befundenem Verfahrensergeb­ nis abgespeichert werden.According to the invention, it is therefore provided that the normal value is determined, by actual values of the course of the monitored variable with a well-judged procedural result be saved.

Einzelheiten der Erfindung werden anschließend anhand eines Diagramms beschrieben, welches den zeitlichen Druckverlauf beim Einspritzvorgang darstellt.Details of the invention are subsequently described using a diagram, which represents the pressure over time during the injection process.

Die erfindungsgemäße Überwachung des Einspritzvorgangs erfolgt derart, daß eine Kurve 1 als obere Schranke für den zeitlichen Verlauf der überwachten Größe, im vorliegenden Fall des Einspritzdruckes, gewählt wird. Eine weitere Kurve 2 wird als untere Schranke gewählt, wobei die Kurven 1 und 2 entsprechend dem dargestellten Diagramm auf einem Bildschirm visualisiert werden können. Während des Betriebs der Einrichtung werden die Momentan­ werte der überwachten Größe gemessen und registriert und gegebenenfalls in Form der Kurve 3 aufgezeichnet. Kommt es in einem Punkt 4 zu einer Überschneidung der Kurve 3 mit einer der Kurven 1 und 2, erfolgt eine vorbestimmte Reaktion.The injection process is monitored in such a way that a curve 1 is selected as the upper limit for the time profile of the monitored variable, in the present case the injection pressure. Another curve 2 is selected as the lower barrier, curves 1 and 2 being able to be visualized on a screen in accordance with the diagram shown. During the operation of the device, the instantaneous values of the monitored variable are measured and registered and possibly recorded in the form of curve 3 . If there is an overlap of curve 3 with one of curves 1 and 2 at point 4 , a predetermined reaction takes place.

Die Kurven 2 und 3 werden gewonnen, indem - ausgehend von einer Idealkurve - eine bestimmte zulässige Abweichung festgelegt wird. Typisch wäre die Zulässigkeit einer Über­ schreitung des Normalwertes um 6 Prozent nach oben und um 3 Prozent nach unten. Die Idealkurve wird nun nicht durch theoretische Überlegungen gewonnen sondern dadurch, daß mindestens ein zu einem guten Produkt führenden Betriebszyklus hinsichtlich der über­ wachten Größe als vorbildlich definiert wird. Sinnvollerweise wird man das Ergebnis von bis zu 30 Spritzzyklen speichern und durch geeignete Mittelwertbildung die Idealkurve auffinden, die zusammen mit den zulässigen oberen und unteren Abweichungen das Toleranzband definiert.Curves 2 and 3 are obtained by - based on an ideal curve - specifying a certain permissible deviation. The admissibility of exceeding the normal value by 6 percent upwards and by 3 percent downwards would be typical. The ideal curve is now not obtained by theoretical considerations but by defining at least one operating cycle leading to a good product as exemplary in terms of the monitored size. It makes sense to save the result of up to 30 spray cycles and to find the ideal curve by means of suitable averaging, which together with the permissible upper and lower deviations defines the tolerance band.

Zweckmäßig ist es, von Zeit zu Zeit die Idealkurve an die sich allmählich wandelnden Betriebsbedingungen anzupassen, also vorzusehen, daß wenigstens ab und zu das Ergeb­ nis eines früheren Zyklus durch jenes eines späteren vor der Mittelung ersetzt wird. Dadurch werden natürliche Driften im Prozeß akzeptiert, ohne eine Toleranzüberschreitung und damit Fehlerreaktion auszulösen.From time to time it is useful to change the ideal curve to the gradually changing one Adjust operating conditions, so provide that at least every now and then the result an earlier cycle is replaced by a later one before averaging. Thereby natural drifts in the process are accepted without exceeding the tolerance and thus Trigger error response.

Spricht die Einspritzüberwachung an, weil das Toleranzfeld verlassen wurde, so kann dem Benutzer die Wahl zwischen verschiedenen Reaktionsmöglichkeiten überlassen werden. Beispielsweise können die Reaktionsmöglichkeiten 0, 1, 2 mit folgender Bedeutung ange­ boten werden:
0 = Ausschuß melden. Der Schuß wird als Ausschuß gewertet. Die der Auswahl ent­ sprechende Fehlermeldung "Spritzüberwachung!" erscheint. Die Produktion läuft ohne weitere Auswirkung ab, außer der Ausschußzähler ist abgelaufen, was am Zyklus­ ende zu einem Produktionsstop führt.
1 = Einspritzen abbrechen. Der Einspritzvorgang wird sofort abgebrochen und der Zyklus mit der vollständigen Nachdruckzeit (Druck = 0 bar) und anschließend der Kühlzeit fortgesetzt. Es erfolgt kein neuer Zyklusstart. Der Schuß wird als Ausschuß gewertet. Die der Auswahl entsprechende Fehlermeldung "Spritzüberwachung x!" erscheint.
2 = Umschalten auf Nachdruck. Der Einspritzvorgang wird sofort abgebrochen und der Zyklus ab Beginn Nachdruck vollständig weitergefahren. Die Produktion läuft weiter.If the injection monitor responds because the tolerance field has been left, the user can be given a choice between different reaction options. For example, the reaction options 0, 1, 2 can be offered with the following meaning:
0 = report committee. The shot is counted as a committee. The error message "Spray monitoring!" Corresponding to the selection appears. The production runs without any further effects, unless the scrap counter has expired, which leads to a production stop at the end of the cycle.
1 = cancel injection. The injection process is stopped immediately and the cycle continues with the complete hold pressure time (pressure = 0 bar) and then the cooling time. There is no new cycle start. The shot is counted as a committee. The error message "Spray monitoring x!" Corresponding to the selection appears.
2 = switch to reprint. The injection process is stopped immediately and the cycle continues from the beginning of the reprint. Production continues.

Claims (3)

1. Verfahren zur Überwachung des Einspritzvorganges bei einer Spritzgießmaschine, wobei die Position oder Geschwindigkeit des Einspritzkolbens bzw. der Einspritzschnecke oder der Druck im Kunststoff dauernd überwacht und bei Überschreiten einer vorbestimmten Abweichung vom Normalwert eine Reaktion ausgelöst wird, dadurch gekennzeichnet, daß die Bestimmung des Normalwertes erfolgt, indem Istwerte des Verlaufes der überwachten Größe bei gut befundenem Verfahrensergebnis abgespeichert werden.1. A method for monitoring the injection process in an injection molding machine, the position or speed of the injection piston or the injection screw or the pressure in the plastic continuously monitored and a reaction is triggered when a predetermined deviation from the normal value is triggered, characterized in that the determination of the normal value takes place by storing actual values of the course of the monitored variable with a well-judged process result. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Ergebnisse aus mehreren Betriebszyklen gemittelt werden.2. The method according to claim 1, characterized in that the results be averaged over several operating cycles. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens ab und zu das Ergebnis eines früheren Zyklus durch jenes eines späteren vor der Mittelung ersetzt wird.3. The method according to claim 1, characterized in that at least from time to time the result of an earlier cycle by that of a later one before averaging is replaced.
DE10143473A 2000-09-12 2001-09-05 Parameter control in an injection molding process involves using stored values from earlier successful operations to form tolerance areas for an existing operation Ceased DE10143473A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0066700U AT4744U1 (en) 2000-09-12 2000-09-12 METHOD FOR MONITORING THE INJECTION PROCESS IN AN INJECTION MOLDING MACHINE

Publications (1)

Publication Number Publication Date
DE10143473A1 true DE10143473A1 (en) 2002-04-18

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DE10143473A Ceased DE10143473A1 (en) 2000-09-12 2001-09-05 Parameter control in an injection molding process involves using stored values from earlier successful operations to form tolerance areas for an existing operation

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AT (1) AT4744U1 (en)
DE (1) DE10143473A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061775A1 (en) * 2007-12-20 2009-07-02 Geiger Technik Gmbh Injection molding method, involves comparing mean value, maximum value, point of time, initial gradient and time constants with provided parameter set point, and determining dwell pressure value for subsequent injection molding operation
DE102004002029B4 (en) * 2003-01-16 2009-10-29 Yazaki Corp. Apparatus and method for monitoring a waveform
DE102016001039B4 (en) 2015-02-16 2020-06-10 Engel Austria Gmbh Method for operating an injection unit and injection unit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007019100B4 (en) * 2007-04-23 2009-03-19 Adcuram Maschinenbauholding Gmbh Method and device for injection molding
DE202011000322U1 (en) 2011-02-11 2012-05-16 MBM Maschinenbau Mühldorf GmbH injection molding
AT13974U1 (en) 2013-07-30 2015-02-15 Engel Austria Gmbh Shaping machine with negative mold protection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004002029B4 (en) * 2003-01-16 2009-10-29 Yazaki Corp. Apparatus and method for monitoring a waveform
DE102007061775A1 (en) * 2007-12-20 2009-07-02 Geiger Technik Gmbh Injection molding method, involves comparing mean value, maximum value, point of time, initial gradient and time constants with provided parameter set point, and determining dwell pressure value for subsequent injection molding operation
DE102016001039B4 (en) 2015-02-16 2020-06-10 Engel Austria Gmbh Method for operating an injection unit and injection unit

Also Published As

Publication number Publication date
AT4744U1 (en) 2001-11-26

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