AT4744U1 - METHOD FOR MONITORING THE INJECTION PROCESS IN AN INJECTION MOLDING MACHINE - Google Patents
METHOD FOR MONITORING THE INJECTION PROCESS IN AN INJECTION MOLDING MACHINE Download PDFInfo
- Publication number
- AT4744U1 AT4744U1 AT0066700U AT6672000U AT4744U1 AT 4744 U1 AT4744 U1 AT 4744U1 AT 0066700 U AT0066700 U AT 0066700U AT 6672000 U AT6672000 U AT 6672000U AT 4744 U1 AT4744 U1 AT 4744U1
- Authority
- AT
- Austria
- Prior art keywords
- injection
- monitoring
- molding machine
- normal value
- injection molding
- Prior art date
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
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 und die Bestimmung des Normalwertes erfolgt, indem Istwerte des Verlaufes der überwachten Größe bei gut befundenem Verfahrensergebnis abgespeichert werden.Process for monitoring the injection process in an injection molding machine, the position or speed of the injection plunger or the injection screw or the pressure in the plastic being continuously monitored and a reaction being triggered when a predetermined deviation from the normal value is exceeded and the normal value being determined by using actual values of the course the monitored size can be saved if the process result is found to be good.
Description
<Desc/Clms Page number 1>
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.
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.
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 Einspntzkolbens oder des Einspritzdrucks akzeptabel ist, wird somit die Qualität des erzeugten Produktes gewählt.
Erfindungsgemäss ist somit vorgesehen, dass die Bestimmung des Normalwertes erfolgt, indem Istwerte des Verlaufes der überwachten Grösse bei gut befundenem Verfahrensergeb- nis abgespeichert werden.
Einzelheiten der Erfindung werden anschliessend anhand eines Diagramms beschrieben, weiches den zeitlichen Druckverlauf beim Einspntzvorgang darstellt.
Die erfindungsgemässe Uberwachung des Einspritzvorgangs erfolgt derart, dass eine Kurve 1 als obere Schranke für cen zeitlichen Verlauf der überwachten Grösse, im vorliegenden Fall des Einspntzdruckes, gewahlt wird. Eine weitere Kurve 2 wird ais untere Schranke gewählt, wobei die Kurven 1 una 2 entsprechend dem dargestellten Diagramm auf einem Bildschirm visualisiert werden können. Während des Betnebs der Einnchtung werden die Momentan- werte der überwachten Grösse gemessen und registnert und gegebenenfalls in Form der
<Desc/Clms Page number 2>
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.
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.
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.
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 = Einspntzen 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 Einspntzvorgang wird sofort abgebrochen und der
Zyklus ab Beginn Nachdruck vollständig weitergefahren. Die Produktion läuft weiter.
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The invention relates to a method for monitoring the injection process in an injection molding machine, the position or speed of the injection plunger or the injection screw or the pressure in the plastic being continuously monitored and a reaction triggered when a predetermined deviation from the normal value is exceeded.
Many components work together in the injection molding of plastic. In order to produce a precisely reproducible product, the machine itself must first behave as evenly as possible in the successive cycles, which is particularly difficult due to temperature changes. The condition of the mold used affects the injection process and, above all, the granulate processed in the dosing and plasticizing unit is never of absolutely the same quality.
The problems presented led to the fact that methods of the type defined at the outset (see EP 0 228 799 Japan Steelworks) were designed. The problem with this known method is above all the establishment of a normal course, from which the admissibility of a detected deviation is assessed. The invention is based on the consideration that it is hardly possible to calculate an optimal curve shape anyway, so that it also makes little sense. to enforce compliance with such a theoretically predetermined curve with considerable control effort.
The quality of the product produced is thus chosen as a criterion for whether a certain time course of an essential process variable such as the speed of the injection piston or the injection pressure is acceptable.
According to the invention, provision is therefore made for the normal value to be determined by storing actual values of the course of the monitored variable when the method result is found to be good.
Details of the invention are subsequently described with the aid of a diagram which shows the pressure course over time during the injection process.
The monitoring of the injection process according to the invention takes place in such a way that a curve 1 is selected as the upper limit for the time course 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 accommodation, the instantaneous values of the monitored size are measured and registered and, if necessary, in the form of the
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Curve 3 recorded. If there is an overlap of curve 3 with one of curves 1 and 2 at point 4, a predetermined reaction takes place.
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.
From time to time, it is advisable to adapt the ideal curve to the gradually changing operating conditions, that is, to provide that at least every now and then the result of an earlier cycle is replaced by that of a later one before averaging. As a result, natural drifts in the process are accepted without triggering a tolerance violation and thus an error reaction.
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 scrap. The shot is counted as a committee. The error message corresponding to the selection "Spray monitoring!" 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 spitting. 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 corresponding to the selection, spray monitoring x! 'appears.
2 = switch to reprint. The inspection process is stopped immediately and the
Cycle fully continued from the start of the reprint. Production continues.
Claims (3)
Priority Applications (2)
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 |
DE10143473A 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 |
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 |
---|---|
AT4744U1 true AT4744U1 (en) | 2001-11-26 |
Family
ID=3496622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT0066700U AT4744U1 (en) | 2000-09-12 | 2000-09-12 | METHOD FOR MONITORING THE INJECTION PROCESS IN AN INJECTION MOLDING MACHINE |
Country Status (2)
Country | Link |
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AT (1) | AT4744U1 (en) |
DE (1) | DE10143473A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007019100A1 (en) * | 2007-04-23 | 2008-11-13 | Adcuram Maschinenbauholding Gmbh | Injection molding method for injection molded mass in injection molding machine, involves causing event to influence mixing homogeneity of mass during increase or decrease of determined injection- and dosing operations from tolerance range |
DE202011000322U1 (en) | 2011-02-11 | 2012-05-16 | MBM Maschinenbau Mühldorf GmbH | injection molding |
DE102014011335A1 (en) | 2013-07-30 | 2015-02-05 | Engel Austria Gmbh | Shaping machine with negative mold protection |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004216763A (en) * | 2003-01-16 | 2004-08-05 | Yazaki Corp | Simple waveform monitoring device |
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 |
AT516879B1 (en) | 2015-02-16 | 2018-02-15 | Engel Austria Gmbh | Method for operating an injection unit and injection unit |
-
2000
- 2000-09-12 AT AT0066700U patent/AT4744U1/en not_active IP Right Cessation
-
2001
- 2001-09-05 DE DE10143473A patent/DE10143473A1/en not_active Ceased
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007019100A1 (en) * | 2007-04-23 | 2008-11-13 | Adcuram Maschinenbauholding Gmbh | Injection molding method for injection molded mass in injection molding machine, involves causing event to influence mixing homogeneity of mass during increase or decrease of determined injection- and dosing operations from tolerance range |
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 |
DE102014011335A1 (en) | 2013-07-30 | 2015-02-05 | Engel Austria Gmbh | Shaping machine with negative mold protection |
Also Published As
Publication number | Publication date |
---|---|
DE10143473A1 (en) | 2002-04-18 |
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