AT501953B1 - METHOD FOR DETERMINING MELT HEATENESS IN AN INJECTION MOLDING MACHINE - Google Patents
METHOD FOR DETERMINING MELT HEATENESS IN AN INJECTION MOLDING MACHINE Download PDFInfo
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- AT501953B1 AT501953B1 AT0059506A AT5952006A AT501953B1 AT 501953 B1 AT501953 B1 AT 501953B1 AT 0059506 A AT0059506 A AT 0059506A AT 5952006 A AT5952006 A AT 5952006A AT 501953 B1 AT501953 B1 AT 501953B1
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- 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
- B29C45/78—Measuring, controlling or regulating of temperature
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- 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
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- 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
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- 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
- B29C2945/7601—Pressure derivative, change thereof
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- 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
- B29C2945/7604—Temperature
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- 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
- B29C2945/7605—Viscosity
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- 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
- B29C2945/76056—Flow rate
- B29C2945/76063—MFI, MFR
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- 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
- B29C2945/7619—Injection unit barrel
- B29C2945/76193—Injection unit barrel barrel-chamber
- B29C2945/76197—Injection unit barrel barrel-chamber screw ante-chamber
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- 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
- B29C2945/76451—Measurement means
- B29C2945/76454—Electrical, e.g. thermocouples
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- 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
- B29C2945/76498—Pressure
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- 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
- B29C2945/76595—Velocity
- B29C2945/76605—Velocity rotational movement
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- 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
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76665—Injection unit screw
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- 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
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- 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
- B29C45/766—Measuring, controlling or regulating the setting or resetting of moulding conditions, e.g. before starting a cycle
Description
2 AT 501 953 B12 AT 501 953 B1
Die Erfindung betrifft ein Verfahren zur Bestimmung der Schmelzehomogenität innerhalb einer Spritzgießmaschine.The invention relates to a method for determining the melt homogeneity within an injection molding machine.
Beim Spritzgießen mit einer Spritzgießmaschine, die mindestens eine Spritzeinheit mit einer Plastifizier- und Einspritzschnecke und eine Maschinensteuerung aufweist, ist die Bereitstellung einer homogenen Schmelze im Schneckenvorraum durch die Schnecke eine Voraussetzung für die Prozesskonstanz. Bei Dosierwegen über 3D (drei mal Schneckendurchmesser) kommt es bei konventionellen Schnecken zu einer inhomogenen Temperaturverteilung im Schneckenvorraum, die sich bereits negativ auf die Formteilqualität auswirken kann. Fig. 1 zeigt die mittlere Temperatur sowie die Spannweite zwischen minimaler und maximaler Temperatur im Schneckenvorraum bei einem Dosierweg 2D und bei einem Dosierweg 4D. Zur Bestimmung der Temperaturverteilung wurde dabei ein Thermoelement im Schneckenvorraum benutzt. (Die Striche in Fig. 1 kennzeichnen die Streuung der Temperatur (maximale und minimale Temperatur) über dem Dosierweg, d.h. entlang des Dosierweges von 2D bzw. 4D gibt es eine Stelle, bei der die maximale Temperatur auftritt, und eine Stelle, bei der die minimale Temperatur auftritt. Der breite Balken gibt den Mittelwert der Temperatur an.)In injection molding with an injection molding machine having at least one injection unit with a plasticizing and injection screw and a machine control, the provision of a homogeneous melt in the screw antechamber by the screw is a prerequisite for process consistency. In the case of dosing paths over 3D (three times the screw diameter), an inhomogeneous temperature distribution in the screw antechamber occurs in conventional screws, which can already have a negative effect on the quality of the molded part. Fig. 1 shows the average temperature and the span between minimum and maximum temperature in the screw antechamber at a Dosierweg 2D and at a Dosierweg 4D. To determine the temperature distribution while a thermocouple was used in the antechamber. (The bars in Fig. 1 indicate the dispersion of temperature (maximum and minimum temperature) over the dosing path, ie along the dosing path of Figs. 2D and 4D, there is a point where the maximum temperature occurs and a position where the minimum temperature occurs, the wide bar indicates the mean of the temperature.)
Die Bestimmung der Massetemperatur durch Einstechen eines Einstichthermoelementes in den ausgespritzten Schmelzekuchen liefert nur einen gemittelten Wert für die Temperatur. Des Weiteren ist diese Methode nicht automatisierbar.The determination of the melt temperature by piercing a Einichtherhermoelementes in the ejected melt cake provides only an average value for the temperature. Furthermore, this method is not automatable.
In der JP 09 187847 A wird der Zusammenhang zwischen Druck, Viskosität und Temperatur genutzt, um die Viskosität zu vergleichmäßigen. Bei der Lösung gemäß der DE 23 34 613 A1 wird die Viskosität gesteuert bzw. gezielt verändert. Gemäß der Vorgehensweise nach der EP 1 238 778 A1 wird das Schmelzematerial charakterisiert. Die DE 197 55 500 A1 offenbart, das Temperaturprofil im Schneckenvorraum zu erfassen. In der JP 06 246807 A und in der US 2004/089964 A1 wird angestrebt, einen Temperaturanstieg vorauszusagen.In JP 09 187847 A, the relationship between pressure, viscosity and temperature is used to equalize the viscosity. In the solution according to DE 23 34 613 A1, the viscosity is controlled or specifically changed. According to the procedure of EP 1 238 778 A1, the melt material is characterized. DE 197 55 500 A1 discloses to detect the temperature profile in the screw antechamber. In JP 06 246807 A and in US 2004/089964 A1, the aim is to predict an increase in temperature.
Aufgabe der Erfindung ist es daher, ein Verfahren anzubieten, mit dem auf die Temperaturhomogenität im Schneckenvorraum geschlossen werden kann.The object of the invention is therefore to provide a method with which it is possible to infer the temperature homogeneity in the screw antechamber.
Zur Lösung der Aufgabe sieht die Erfindung ein Verfahren wie in Anspruch 1 definiert vor. Vorteilhafte Ausführungsformen und Weiterbildungen sind in den Unteransprüchen angegeben.To solve the problem, the invention provides a method as defined in claim 1 before. Advantageous embodiments and further developments are specified in the subclaims.
Die meisten Spritzgießmaschinen sind nicht mit einem Thermoelement im Schneckenvorraum ausgerüstet. Nichtsdestoweniger kann mit dem erfindungsgemäßen Verfahren die Temperaturhomogenität im Schneckenvorraum ermittelt werden.Most injection molding machines are not equipped with a thermocouple in the screw antechamber. Nevertheless, with the method according to the invention, the temperature homogeneity in the screw antechamber can be determined.
Im Folgenden wird das Verfahren anhand eines Beispiels beschrieben.The following describes the method by way of example.
In der Maschinensteuerung ist eine Prozedur „Bestimmung der Schmelzehomogenität“ auswählbar. Dabei wird nach einer Einlaufphase der Maschine unter Produktionsbedingungen (Herstellung des Gleichgewichtszustandes) unmittelbar vor dem nächsten Einspritzen die Spritzeinheit in eine hintere Position gefahren, und es wird mit geringer und konstanter Schneckengeschwindigkeit ins Freie ausgespritzt, ohne auf Nachdruck umzuschalten. Der sich dabei einstellende Druckverlauf wird aufgezeichnet. Ein Beispiel hiefür ist in Fig. 2 wiedergegeben, wo eine Kurve 1 den Druckverlauf beim Ausspritzen ins Freie zeigt. (Die darunter gezeigte Kurve, veranschaulicht den Volumenstrom Ψ, der über dem Volumen V - mit geringen Schwankungen - konstant ist.) Auf der x-Achse ist das Dosiervolumen V aufgetragen (aufdosierte Stellung bei 201,7 cm3; Schnecke in vorderer Position bei 3,0 cm3). Der auftretende Druckunterschied ist mit Δρ gekennzeichnet.In the machine control a procedure "determination of melt homogeneity" can be selected. In this case, after an entry phase of the machine under production conditions (establishment of the equilibrium state) immediately before the next injection, the injection unit moved to a rear position, and it is injected at low and constant screw speed into the open, without switching to holding pressure. The resulting pressure profile is recorded. An example of this is shown in Fig. 2, where a curve 1 shows the pressure profile during ejection to the outside. (The curve below shows the volume flow Ψ, which is constant over the volume V - with small fluctuations.) The dosing volume V is plotted on the x-axis (incremented position at 201.7 cm3, screw in front position at 3 , 0 cm3). The occurring pressure difference is marked Δρ.
Aufgrund der Zusammenhänge zwischen dem Druck p und der Viskosität η beim Durchströmen einer Düse 3 AT 501 953 B1Due to the relationship between the pressure p and the viscosity η flowing through a nozzle 3 AT 501 953 B1
(D (2) und zwischen der Temperatur T und der Viskosität 1 ist auch ein Zusammenhang zwischen dem Druck und der Temperatur gegeben:(D (2) and between the temperature T and the viscosity 1, there is also a relationship between the pressure and the temperature:
(3)(3)
Folgende Kennzahlen für die Schmelzehomogenität KHom können in der Maschinensteuerung ausgegeben werden: (4) I/· _ ^Pmax AHom “ ~ (5) (mit = mittlerer Druck) (6) bzw. (7)The following key figures for the melt homogeneity KHom can be output in the machine control: (4) I / · _ ^ Pmax AHom "~ (5) (with = mean pressure) (6) or (7)
Darin ist der mittlere Druck wie folgt definiert: (8)The mean pressure is defined as follows: (8)
Die Ausspritzgeschwindigkeit ins Freie sollte aus folgenden Gründen niedrig sein: 1. Eine Dissipationserwärmung in der Düse ist zu vermeiden. Diese Dissipationserwärmung würde nämlich das Ergebnis verfälschen, d.h. das zum Schluss ausgespritzte Material würde wärmer erscheinen als es tatsächlich ist. 2. Bei geringen Schneckengeschwindigkeiten sind der Volumenstrom und damit die sich in der Düse einstellende Schergeschwindigkeit gering. Der Zusammenhang zwischen Viskosität und Temperatur ist bei niedrigen Schergeschwindigkeiten besonders ausgeprägt, wie Fig. 3 zeigt, in der Viskositätskurven für Polystyrol PS454C bei unterschiedlichen Temperaturen (210 °C, 230 °C, 250 °C) dargestellt sind. Temperaturdifferenzen im Schneckenvorraum 4 AT 501 953 B1 ergeben dadurch größere und damit besser auflösbare Druckdifferenzen.The ejection velocity into the open air should be low for the following reasons: 1. Dissipation heating in the nozzle should be avoided. This dissipation warming would distort the result, i. the final material spurted out would appear warmer than it actually is. 2. At low screw speeds, the volume flow and thus the shear rate occurring in the nozzle are low. The relationship between viscosity and temperature is particularly pronounced at low shear rates, as shown in Fig. 3, in which viscosity curves for polystyrene PS454C are shown at different temperatures (210 ° C, 230 ° C, 250 ° C). Temperature differences in the antechamber 4 AT 501 953 B1 result in larger and thus better resolvable pressure differences.
Die Auflösung der Schmelzehomogenität mittels des beschriebenen Verfahrens wird genauer, wenn die Geometrie, durch die ausgespritzt wird, an das Viskositätsniveau und an den in der Steuerung auflösbaren Druck angepasst ist. Daher ist neben dem Ausspritzen durch die Maschinendüse auch das Ausspritzen durch eine By-pass-Düse mit definierter Kapillargeometrie als Variante möglich. Die Fig. 4 und 4A zeigen ein Beispiel mit einem Zylinder 2, einem Umschaltventil 3 und der möglichen Ausgabe über die Maschinendüse 4 (Fig. 4) oder die By-Pass-Düse 5 (Fig. 4A) mit definierter Kapillargeometrie. Unter Berücksichtigung der rheologischen Verhältnisse kann damit direkt die Viskosität bzw. ein Fließindex ermittelt werden. Verändert sich das Viskositätsniveau, so kann darauf in der Maschinensteuerung direkt reagiert und der Umschaltdruck entsprechend angepasst werden, um das Formteilgewicht konstant zu halten. Der Proportionalitätsfaktor zwischen der Viskositätsänderung und der automatischen Veränderung des Umschaltdruckes wird iterativ durchgeführt.Dissolution of the melt homogeneity by the described method becomes more accurate as the geometry being spouted is adjusted to the viscosity level and to the pressure resolvable in the controller. Therefore, in addition to the spraying through the machine nozzle and the ejection through a by-pass nozzle with a defined capillary geometry is possible as a variant. 4 and 4A show an example with a cylinder 2, a switching valve 3 and the possible output via the machine nozzle 4 (FIG. 4) or the by-pass nozzle 5 (FIG. 4A) with a defined capillary geometry. Taking into account the rheological conditions can thus be determined directly the viscosity or a flow index. If the viscosity level changes, this can be directly reacted to in the machine control and the switchover pressure can be adjusted accordingly in order to keep the weight of the molding constant. The proportionality factor between the change in viscosity and the automatic change in the switching pressure is performed iteratively.
Aus Fig. 2 kann daher herausgelesen werden, dass bei einem Dosiervolumen von ca. 100 cm3 die Massetemperatur deutlich abgesunken ist, weil hier der Druck ansteigt. Durch eine zusätzliche Anwahl in der Maschinensteuerung („Vergleichmäßigung der Schmelzehomogenität“) können nun Maßnahmen getroffen werden, um die Temperatur zu vergleichmäßigen. Eine Veränderung des Staudruck- und/oder des Schneckendrehzahlprofils beeinflusst die Temperaturhomogenität.From Fig. 2 can therefore be read that at a metering volume of about 100 cm3, the melt temperature has dropped significantly, because here the pressure increases. By an additional selection in the machine control ("equalization of melt homogeneity") measures can now be taken to even out the temperature. A change in the dynamic pressure and / or the screw speed profile influences the temperature homogeneity.
Der Eingriff der Maschinensteuerung erfolgt nun in folgender Form: > Nach der Stabilisierung der Schneckenvorlaufgeschwindigkeit beim Ausspritzen ins Freie wird die Druckveränderung erfasst. > Sinkt der Druck, so werden der Staudruck und die Schneckendrehzahl in diesem Bereich reduziert. Damit wird weniger Scherung in das Material eingebracht, und die Schmelzetemperatur sinkt. > Steigt der Druck, so werden der Staudruck und die Schneckendrehzahl in diesem Bereich erhöht. Dadurch wird mehr Scherung in das Material eingebracht, und die Schmelzetemperatur steigt. > Die Veränderung von Staudruck und Schneckendrehzahl erfolgt proportional zur aufgetretenen Druckdifferenz. Die jeweiligen Proportionalitätsfaktoren sind systemabhängig und iterativ bestimmbar. > Für die in Fig. 2 dargestellte Situation ergibt sich somit ein mögliches Dosierprofil, wie es in Fig. 5 dargestellt ist, wobei der Staudruck 6 und die Umfangsgeschwindigkeit 7 über dem Dosiervolumen V aufgetragen sind.The intervention of the machine control takes place in the following form: > After the stabilization of the screw feed rate when spraying out, the pressure change is detected. ≫ If the pressure drops, the back pressure and the screw speed in this area are reduced. Thus, less shear is introduced into the material, and the melt temperature drops. ≫ If the pressure increases, the back pressure and the screw speed are increased in this area. This introduces more shear into the material and raises the melt temperature. ≫ The change in dynamic pressure and screw speed is proportional to the pressure difference that has occurred. The respective proportionality factors are system-dependent and iteratively determinable. ≫ For the situation shown in Fig. 2 thus results in a possible metering profile, as shown in Fig. 5, wherein the dynamic pressure 6 and the peripheral speed 7 are plotted against the metering volume V.
Nach der Feststellung der Schmelzehomogenität und dem optionalen Verändern der Dosierparameter fährt die Spritzeinheit wieder nach vorne in die Dosierposition. Der nächste Dosiervorgang wird gestartet, und die Produktion läuft weiter.After determining the melt homogeneity and optionally changing the metering parameters, the injection unit moves forward again into the metering position. The next dosing process is started and production continues.
Durch eine automatisierte periodische Kontrolle der Temperaturhomogenität und der optionalen Nachstellung der Dosierparameter kann auch auf Chargenschwankungen (Viskositätsschwankungen) oder andere Störeinflüsse reagiert werden.An automated periodic check of the temperature homogeneity and the optional adjustment of the dosing parameters can also be used to react to batch fluctuations (viscosity fluctuations) or other disturbing influences.
Das vorliegende Verfahren hat unter anderem den Vorteil, dass ein automatisierbares Erkennen und Ausregeln von Schmelzetemperaturinhomogenitäten ohne Verwendung eines Massetemperaturfühlers im Schneckenvorraum ermöglicht wird.The present method has the advantage, inter alia, that it is possible to automatically detect and regulate melt temperature inhomogeneities without using a melt temperature sensor in the screw antechamber.
Claims (5)
Applications Claiming Priority (1)
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DE102005016618A DE102005016618B3 (en) | 2005-04-12 | 2005-04-12 | Determining melt homogeneity in injection molding machines, to establish constant conditions, involves discharging the melt into the open, determining the pressure curve and using this to obtain the temperature curve |
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AT501953A2 AT501953A2 (en) | 2006-12-15 |
AT501953A3 AT501953A3 (en) | 2008-10-15 |
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DE102007030637B4 (en) * | 2007-07-02 | 2009-10-29 | Adcuram Maschinenbauholding Gmbh | Method for injection molding and injection molding machine |
JP6625349B2 (en) * | 2015-06-01 | 2019-12-25 | 住友重機械工業株式会社 | Injection molding machine |
DE102018126313A1 (en) | 2018-10-23 | 2020-04-23 | Kraussmaffei Technologies Gmbh | Method for operating an injection molding machine, in particular with regard to improved constant mold filling, and injection molding machine for carrying out the method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2334613A1 (en) * | 1972-09-18 | 1974-04-04 | Gen Electric | VISCOSITY CONTROL FOR A PLASTICS MOLDING MACHINE |
JPH06246807A (en) * | 1993-02-25 | 1994-09-06 | Japan Steel Works Ltd:The | Injection molding method |
JPH09187847A (en) * | 1994-06-22 | 1997-07-22 | Toshiba Mach Co Ltd | Plasticizing process control method of injection molding machine |
DE19755500A1 (en) * | 1997-12-13 | 1999-06-17 | Univ Halle Wittenberg | Method for recording axial temperature profile of material in a reciprocating screw pump, especially an injection molding machine |
EP1238778A1 (en) * | 2001-03-07 | 2002-09-11 | Fanuc Ltd | Method of and device for evaluating resin using injection molding machine |
US20040089964A1 (en) * | 2002-11-07 | 2004-05-13 | Nissei Plastic Industrial Co., Ltd. | Method for estimating temperatures of plasticized resin with in heating cylinder and at nozzle outlet, and estimating injecting conditions |
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---|---|---|---|---|
JP2507148B2 (en) * | 1990-03-05 | 1996-06-12 | 株式会社小松製作所 | Resin characteristic detection method and injection control method for injection molding machine |
DE29723102U1 (en) * | 1997-12-13 | 1998-03-26 | Univ Halle Wittenberg | Measuring arrangement for detecting the temperature and the axial temperature profile of the conveyed molding compound in screw conveyor and shear devices |
-
2005
- 2005-04-12 DE DE102005016618A patent/DE102005016618B3/en not_active Expired - Fee Related
-
2006
- 2006-04-06 AT AT0059506A patent/AT501953B1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2334613A1 (en) * | 1972-09-18 | 1974-04-04 | Gen Electric | VISCOSITY CONTROL FOR A PLASTICS MOLDING MACHINE |
JPH06246807A (en) * | 1993-02-25 | 1994-09-06 | Japan Steel Works Ltd:The | Injection molding method |
JPH09187847A (en) * | 1994-06-22 | 1997-07-22 | Toshiba Mach Co Ltd | Plasticizing process control method of injection molding machine |
DE19755500A1 (en) * | 1997-12-13 | 1999-06-17 | Univ Halle Wittenberg | Method for recording axial temperature profile of material in a reciprocating screw pump, especially an injection molding machine |
EP1238778A1 (en) * | 2001-03-07 | 2002-09-11 | Fanuc Ltd | Method of and device for evaluating resin using injection molding machine |
US20040089964A1 (en) * | 2002-11-07 | 2004-05-13 | Nissei Plastic Industrial Co., Ltd. | Method for estimating temperatures of plasticized resin with in heating cylinder and at nozzle outlet, and estimating injecting conditions |
Also Published As
Publication number | Publication date |
---|---|
AT501953A3 (en) | 2008-10-15 |
AT501953A2 (en) | 2006-12-15 |
DE102005016618B3 (en) | 2006-09-28 |
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