DE102009014311A1 - Method for monitoring and / or controlling and / or regulating functions of and in injection molding machines - Google Patents
Method for monitoring and / or controlling and / or regulating functions of and in injection molding machines Download PDFInfo
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- DE102009014311A1 DE102009014311A1 DE102009014311A DE102009014311A DE102009014311A1 DE 102009014311 A1 DE102009014311 A1 DE 102009014311A1 DE 102009014311 A DE102009014311 A DE 102009014311A DE 102009014311 A DE102009014311 A DE 102009014311A DE 102009014311 A1 DE102009014311 A1 DE 102009014311A1
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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
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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
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
- B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
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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
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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
- B29C2945/7604—Temperature
- B29C2945/76043—Temperature 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
- B29C2945/76177—Location of measurement
- B29C2945/7618—Injection unit
- B29C2945/7621—Injection unit nozzle
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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
- B29C2945/76254—Mould
- B29C2945/76257—Mould cavity
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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
- B29C2945/76254—Mould
- B29C2945/76274—Mould runners, nozzles
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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
- B29C2945/76254—Mould
- B29C2945/76274—Mould runners, nozzles
- B29C2945/76277—Mould runners, nozzles nozzles
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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
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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
- B29C2945/76538—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
- B29C2945/76494—Controlled parameter
- B29C2945/76568—Position
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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
- B29C2945/76702—Closure or clamping device
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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
- B29C2945/76732—Mould
- B29C2945/76752—Mould runners, nozzles
- B29C2945/76755—Mould runners, nozzles nozzles
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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
- B29C2945/76765—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
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
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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
- B29C2945/76822—Phase or stage of control
- B29C2945/76869—Mould clamping, compression of the cavity
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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
- B29C2945/76822—Phase or stage of control
- B29C2945/76876—Switch-over
- B29C2945/76882—Switch-over injection-holding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Bei einem Verfahren zur Überwachung und/oder Steuerung und/oder Regelung von Funktionen von und bei Spritzgießmaschinen mittels Sensoren (7), insbesondere Temperatur- und/oder Drucksensoren, welche eine Schmelze in zumindest einem Heißkanal, einer Düse, einer Kavität od. dgl. überwachen, soll der Sensor (7) bei Beginn eines Temperatur- und/oder Druckanstiegs ein Signal für einenÜberwachungs- und/oder Regelvorgang in der Spritzgießmaschine auslösen.In a method for monitoring and / or controlling and / or regulating functions of and in injection molding machines by means of sensors (7), in particular temperature and / or pressure sensors, which od a melt in at least one hot runner, a nozzle, a cavity. monitor, the sensor (7) at the beginning of a temperature and / or pressure increase trigger a signal for a monitoring and / or control process in the injection molding machine.
Description
Die Erfindung betrifft ein Verfahren zur Überwachung und/oder Steuerung und/oder Regelung von Funktionen von und bei Spritzgiessmaschinen, mittels Sensoren, insbesondere Temperatur- und/oder Drucksensoren, welche einen Fluss der Schmelze durch zumindest einen Heisskanal, eine Düse, in einer Kavität od. dgl. über wachen.The The invention relates to a method for monitoring and / or Control and / or regulation of functions of and in injection molding machines, by means of Sensors, in particular temperature and / or pressure sensors, which a flow of the melt through at least one hot runner, a nozzle, od in a cavity or the like.
Stand der TechnikState of the art
Es ist bekannt, beim Spritzgiessen signifikante Spritzgiessparameter mit Hilfe von Sensoren zu erfassen und diese zum Überwachen, Steuern und Regeln des jeweiligen Spritzgiessprozesses zu verwenden. Hierbei wird vor allem zwischen Sensoren unterschieden, die zum einen in die Struktur der Werkzeugplatten eingebaut werden, um anschiessend die Metalltemperatur zu ermitteln, und die zum anderen sowohl die Metalltemperatur an der Oberfläche als auch die unmittelbare Kontakttemperatur einer Kunststoffschmelze ermitteln.It is known to have significant injection molding parameters in injection molding detect with the help of sensors and monitor them, To use taxes and rules of the respective injection molding process. In this case, a distinction is made between sensors that are used for one to be built into the structure of the tool plates to anschießend to determine the metal temperature, and to the other both the Metal temperature on the surface as well as the immediate Determine the contact temperature of a plastic melt.
So
zeigt beispielweise die
Mit einem derartigen Temperatursensor werden jedoch Messkurven bzw. Temperatur-Zeit-Kennlinien erhalten, die einen sehr trägen Verlauf zeigen, d. h. die Messdaten, die damit gemessen werden können, sind keineswegs für eine sogenannte Echtzeitsteuerung verwendbar.With However, such a temperature sensor will be measured curves or Get temperature-time characteristics that are very sluggish Show course, d. H. the measurement data that can be measured with it, are by no means usable for a so-called real-time control.
Ausser Temperatursensoren werden in vielen Anwendungsfällen auch Drucksensoren verwendet. Sowohl Temperatur, wie auch Drucksensoren können an beliebigen Stellen der Spritzgiessmaschine bzw. des Spritzgiesswerkzeuges vorgesehen werden. Dies gilt vor allem für den Bereich der Heisskanäle, der Düsen und der Kavitäten. Hierauf soll die Erfindung aber nicht beschränkt sein, es sind viele Stellen in einer Spritzgiessmaschine denkbar, wo bestimmte Parameter aufgenommen werden sollen.Except Temperature sensors are also used in many applications Pressure sensors used. Both temperature and pressure sensors can anywhere on the injection molding machine or injection molding tool be provided. This is especially true for the area hot-channels, nozzles and cavities. However, the invention should not be restricted to this. There are many places in an injection molding machine conceivable where certain Parameters to be included.
Aufgabe der ErfindungObject of the invention
Hier setzt die Erfindung ein, der die Aufgabe zugrunde liegt, ein Verfahren der oben genannten Art aufzuzeigen, mit dem es auf einfache und kostengünstige Weise möglich wird, während eines Spritzgiessprozesses relativ schnell, d. h. zeitnah Änderungen als Parameter zur Manipulation des Spritzgiessprozesses zu erfassen.Here employs the invention, which is the object of a method of the above type, with which it is easy and simple cost-effective way becomes possible while an injection molding process relatively fast, d. H. timely changes to capture as a parameter for manipulation of the injection molding process.
Lösung der AufgabeSolution of the task
Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass aber nicht ausschliesslich, vor allem soll wenn die Schmelze den Sensor erreicht, der Sensor bei Beginn eines Temperatur- und/oder Druckanstiegs ein Signal für einen Überwachungs- und/oder Regelvorgang in der Spritzgiessmaschine auslösen. Der Sensor kann aber auch z. B. den Grad der Kompression der Schmelze überwachen und gegebenenfalls regeln.According to the invention this task is solved by not only especially when the melt reaches the sensor, the sensor should at the beginning of a temperature and / or pressure increase, a signal for trigger a monitoring and / or control process in the injection molding machine. The sensor can also z. B. monitor the degree of compression of the melt and if necessary regulate.
Geregelt werden sollen nicht nur die eigentlichen Funktionen einer Spritzgiessmaschine, sondern alle möglichen Funktionen, die von der Erfassung der Schmelzefront abhängig sind. Dazu gehört auch das Regeln bzw. Steuern von Verschlussdüsen oder beweglichen Kernen und Stiften oder das schmelzfrontabhängige Initialisieren eines Prägevorgangs, nachdem die Schmelze eine bestimmte Position erreicht hat.controlled not only are the actual functions of an injection molding machine but all the possible functions of the capture are dependent on the melt front. This also belongs the regulation or control of closing nozzles or moving Cores and pins or the melt front-dependent initialization an embossing process, after the melt a certain Reached position.
Heutige Sensoren reagieren aufgrund ihrer Bauweise wesentlich empfindlicher auf Temperatur- und/oder Druckänderungen als herkömmliche Sensoren, d. h. der erfindungsgemäss eingesetzte Sensor besitzt trotz seiner indirekten Temperatur- und/oder Druckmessung bei einer Temperatur- und/oder Druckänderung einen steilen Signalanstieg, der dann in Bruchteilen von Sekunden ein erforderliches Schaltsignal auslösen kann. Durch ihn wird nicht mehr der Verlauf der Temperatur oder des Druckes überwacht (was allerdings immer noch möglich ist), sondern er wird quasi als Schalter benutzt. Diese Verwendung wird besonders unter Schutz gestellt und gilt vor allem für die überwachte Temperatur, ist aber auch bei Drucküberwachung möglich.today Due to their design, sensors are much more sensitive on temperature and / or pressure changes than conventional Sensors, d. H. the sensor used according to the invention has despite its indirect temperature and / or pressure measurement at a temperature and / or pressure change a steep Signal rise, which then in fractions of seconds a required Switching signal can trigger. Through him is no longer the History of the temperature or pressure monitors (what but still possible), but it is quasi used as a switch. This use is especially under protection and applies especially to the supervised Temperature, but is also possible with pressure monitoring.
Nach Massgabe der Erfindung ist es dabei besonders zweckmässig, wenn der mindestens eine Sensor knapp unterhalb einer Wandoberfläche, beispielsweise einer Heisskanalinnenfläche, eine Düsenoberfläche oder eine Kavitätsinnenfläche vorgesehen wird. Dies hat den besonderen Vorteil, dass der Sensor keiner direkten Belastung ausgesetzt wird, womit auch eine Beschädigung durch eine mögliche Überlast ausgeschlossen ist. Dadurch kann der erfindungsgemäss eingesetzte Sensor wiederum in seiner Konstruktion einfacher gestaltet und somit kostengünstiger als vergleichbare direkt messende Sensoren hergestellt werden. Der über dem Sensor stehen bleibende Steg von bevorzugt 0,2–3 mm Dicke wirkt im Falle des Drucksensors quasi als Membran zur Übertragung des Druckes.To According to the invention, it is particularly expedient if the at least one sensor is just below a wall surface, for example, a hot runner inner surface, a nozzle surface or a Kavitätsinnenfläche is provided. This has the particular advantage that the sensor no direct Load is exposed, which also causes damage is excluded by a possible overload. As a result, the sensor used according to the invention can turn designed simpler in its construction and thus more cost-effective be manufactured as comparable direct measuring sensors. The over The sensor has a permanent bridge of preferably 0.2-3 mm Thickness acts as a membrane for transmission in the case of the pressure sensor of the pressure.
Durch die gekapselte Bauweise, d. h. durch die indirekte Messmethode wird der Sensor nicht von der Kunststoffschmelze berührt, weshalb dessen Verschmutzung oder Leckage ausgeschlossen ist, obgleich er eine relativ steile Kennlinie aufweist, wie annähernd ein Sensor mit unmittelbarem Schmelzekontakt. Auch hinterlässt ein derartiger Sensor keine Abdrücke auf einem Formteil, weswegen diese Art der Messung besonders bei Spitzgiessprozessen bevorzugt anwendbar ist, bei denen kein Abdruck zulässig ist, was beispielweise bei optischen Bauteilen wie Linsen, Kontaktlinsen etc. der Fall ist.Due to the encapsulated design, ie by the indirect measurement method, the sensor is not touched by the plastic melt, which is why its contamination or leakage is excluded, although it has a relatively steep characteristic, such as almost a sensor with direct melt contact. Also, such a sensor leaves no impressions on a molded part, which is why this type of measurement is particularly applicable for injection molding processes in which no impression is permitted, which is the case for example with optical components such as lenses, contact lenses.
Aus dem gleichen Grund ist eine Beschädigung des erfindungsgemäss eingesetzten Sensors durch Abrasion – etwa bei glas- oder kohlenstoffgefüllten Schmelzen – ausgeschlossen. Ferner ist die Lebensdauer des Sensors um ein Vielfaches höher als die eines direkt berührenden Sensors. Ferner sind im Gegensatz zu einem die Schmelze direkt berührenden Sensor für dessen gekapselten Einbau keine engen Toleranzen erforderlich; es genügt bzw. wird bevorzugt, wenn die Spitze des Sensors den Grund einer Bohrung im Spritzgiesswerkzeug satt berührt. Ansonsten kann eine die Sensorspitze umgebende Bohrungswandung wesentlich grösser sein, als die eines direkt messenden Sensors.Out for the same reason is a damage of the invention used by abrasion - for example, in glass or carbon filled melts - excluded. Furthermore, the lifetime of the sensor is many times higher than that of a direct-contact sensor. Furthermore, they are in contrast to a melt directly touching sensor for whose encapsulated installation requires no tight tolerances; it is sufficient or is preferred when the tip of the sensor touched the bottom of a hole in the injection mold enough. Otherwise, a bore wall surrounding the sensor tip can be essential greater than that of a direct measuring sensor.
Bereits in der Vergangenheit wurde eine indirekte Methode zur Messung des Drucks in einer Werkzeugkavität oder in einer Düse verwendet. Hierbei wurde ein Dehnungssensor in einer Werkzeugplatte oder in einer Düse eingebaut und mit Hilfe eines direkt messenden Sensors kalibriert (Dehnung = proportional zum Druck). Gemäss der vorliegenden Erfindung wird jedoch direkt die Kraft gemessen, die über den dünnen Steg zwischen Sensor und Kavität übertragen wird. Dieser Steg wirkt quasi als „Membran”. In diesem Fall ist Druck = Kraft pro Fläche. Die erfindungsgemässe Methode ist deshalb zu bevorzugen, da eine Kalibrierung beim Herstellen, also eine Kalibrierung des Sensors beim Hersteller denkbar ist, weshalb auf einen zweiten, direkt messenden Sensor zur Kalibrierung beim Anwender verzichtet werden kann, was bei der Methode mit dem Dehnungssensor notwendig ist. Ausserdem misst ein Dehnungssensor in der Werkzeugplatte quasi integral, d. h., auf eine Fläche bezogen, weshalb er nicht für Schaltvorgänge in Abhängigkeit von der Schmelzefront verwendet werden kann. Gemäss der vorliegenden Erfindung erfolgt ein Druckanstieg dann, wenn die Schmelze an der Sensorposition vorbeifliesst.Already In the past, an indirect method was used to measure the Pressure in a mold cavity or in a nozzle used. This was a strain sensor in a tool plate or installed in a nozzle and with the help of a direct calibrated (strain = proportional to pressure). According to the present invention, however, the Force measured across the thin bridge between Sensor and cavity is transmitted. This jetty acts as a sort of "membrane". In this case is Pressure = force per area. The inventive Method is therefore to be preferred since calibration during manufacture, So a calibration of the sensor at the manufacturer is conceivable, which is why to a second, direct measuring sensor for calibration during Users can be dispensed with, which is necessary in the method with the strain sensor is. In addition, a strain sensor in the tool plate measures quasi integral, d. h., based on an area, which is why he does not for switching depending on the melt front can be used. According to the present Invention, there is a pressure increase when the melt at the Sensor position flows past.
Da der erfindungsgemässe Sensor unter der Wandoberfläche vorgesehen wird, muss dieser vorteilhaft nicht an seiner Sensorfront besonders bearbeitet werden, d. h. er muss nicht der Kontur einer Wand angepasst werden, was in einigen Fällen bei direkt messenden Sensoren der Fall ist.There the inventive sensor under the wall surface is provided, this advantageously does not have on its sensor front specially processed, d. H. he does not have the contour of a wall be adapted, which in some cases in direct-measuring Sensors is the case.
Insbesondere ist es von Vorteil, wenn der nach der Erfindung arbeitende Sensor mindestens die annähernd gleiche Empfindlichkeit bezüglich Temperatur- und/oder Druckänderungen besitzt wie ein Fühler mit unmittelbarem Kontakt mit einer Schmelze, wobei sein Reaktion aufgrund von unterschiedlichen Sensormaterialien erfolgen kann.Especially it is advantageous if the sensor operating according to the invention at least approximately the same sensitivity with respect to temperature and / or pressure changes has like a feeler with direct contact with a melt, with its reaction due to different sensor materials.
Schliesslich
hat es sich als besonders positiv erwiesen, dass durch die nach
dem erfindungsgemässen Verfahren eingesetzten Sensoren
die jeweilige Schmelzeposition in einer nahezu Echtzeit ermittelt
werden kann. Aufgrund dieser ermittelbaren Echtzeit-Temperatur-
und/oder Druckänderungen kann vorteilhaft z. B. ein automatisches
Umschalten auf den Verfahrensschritt Nachdruck, dem eine Schmelze
in mindestens einer Kavität gegen Ende oder am Ende ihres
Fliessweges ausgesetzt wird, hervorragend gesteuert bzw. geregelt
werden. Im Gegensatz dazu wird im Stand der Technik (
Ferner
erlaubt die Verwendung eines erfindungsgemäss arbeitenden
Sensors, dass aufgrund der ermittelbaren Echtzeiten für
Temperatur- und/oder Druckänderungen ein automatisches, schmelzefrontabhängiges Öffnen
und Schliessen von Verschlussdüsen möglich ist.
Dies erfolgt unabhängig von einem automatischen Balancieren
der volumetrischen Füllung, wie es in der
Auch kann bei Anwendung des erfindungsgemässen Verfahrens vorteilhaft ein automatisches Entlüften durch ein schmelzefrontabhängiges Schliessen eines Kernzuges erfolgen oder ein Prägevorgang beim Spritzprägen initialisiert werden.Also may be advantageous when using the inventive method an automatic venting by a melt front-dependent closure a Kernzuges done or an embossing process during injection molding be initialized.
Eine
besonders zweckmässige Verwendung des erfindungsgemässen
Verfahrens kann auch darin bestehen, dass aufgrund der ermittelbaren
Echtzeiten für Temperatur- und/oder Druckänderungen ein
automatisches sequentielles Füllen von Kaskadenwerkzeugen
erfolgt, bei dem eine Schmelze unter Druck aus einer Mehrzahl von
Düsen in eine Kavität eingeführt wird,
wobei zumindest einer Düse der erfindungsgemäss
arbeitende Sensor zugeordnet wird, durch den dann indirekt der Schmelzestrom
in der Kavität ermittelt und dadurch der Einfüllvorgang durch
die Düsen automatisch aufeinander abgestimmt wird, wobei
hier auf die
Ferner kann es bei Spritzgiessprozessen sinnvoll sein, die erwähnten ermittelbaren Echtzeiten auch für ein kontrolliertes Verschieben von sogenannten Bindenähten zu verwenden oder ein Regeln der Schmelzefront bei Familien-Spritzgiesswerkzeugen vorzusehen.Furthermore, it may be useful in Spritzgiessprozessen, mentioned real life times for a controlled displacement of soge called to use weld lines or to provide melt frontage control in family injection molds.
Auch bieten die ermittelbaren Echtzeiten für Temperatur- und/oder Druckänderungen vorteilhaft die Möglichkeit, dass damit ein automatisches Balancieren von Heisskanal-Spritzgiesswerkzeugen eingerichtet wird.Also offer the ascertainable real times for temperature and / or Pressure changes advantageous the possibility that thus an automatic balancing of hot runner injection molding tools is set up.
Schliesslich kann mit den erwähnten ermittelbaren Echtzeiten auch die Viskosität der Schmelze besser innerhalb mindestens einer Kavität durch ein Zusammenwirken von direktem oder indirektem Druck oder direkter oder indirekter Temperatur bestimmt werden.After all can with the aforementioned real-lives also the Viscosity of the melt better within at least one Cavity through an interaction of direct or indirect pressure or direct or indirect temperature.
Generell kann mit den indirekten Sensoren alles gemacht werden, was mit einem direkten Sensor auch gemacht werden kann. In erster Linie ist dies die Überwachung des Prozesses anhand von Maximaldruck, Druckintegral, Druckanstiegsgeschwindigkeit etc., Temperaturen, Temperaturvorlauf etc.. Ausserdem kann das indirekte Signal genauso wie das direkte Signal zur Prozessoptimierung verwendet werden, indem der Signalverlauf entsprechend optimiert wird.As a general rule Everything can be done with the indirect sensors direct sensor can also be made. This is first and foremost the monitoring of the process on the basis of maximum pressure, Pressure integral, rate of pressure rise, etc., temperatures, Temperaturvorlauf etc .. In addition, the indirect signal as well as the direct signal can be used for process optimization by the waveform is optimized accordingly.
Figurenbeschreibungfigure description
Weitere Einzelheiten und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels in Verbindung mit der Zeichnung; es zeigen:Further Details and advantages of the present invention will become apparent from the following description of an embodiment in connection with the drawing; show it:
Bei
dem in
Wie
aus dem Echtzeit-Diagramm gemäss
Die
geringe zeitliche Differenz der beiden Kennlinien
Der
in
Der
Temperatursensor
In
dem in
Der
Temperatursensor
Die
Funktionsweise der vorliegenden Erfindung ist folgende:
Das
Spritzgiesswerkzeug
The injection mold
Über
das Kabel
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 3425459 A1 [0003] - DE 3425459 A1 [0003]
- - DE 10155162 A1 [0016] - DE 10155162 A1 [0016]
- - DE 10112126 [0017] - DE 10112126 [0017]
- - DE 102004031546 A1 [0019] DE 102004031546 A1 [0019]
Claims (24)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009014311A DE102009014311A1 (en) | 2008-08-14 | 2009-03-25 | Method for monitoring and / or controlling and / or regulating functions of and in injection molding machines |
PCT/EP2009/005835 WO2010017970A2 (en) | 2008-08-14 | 2009-08-12 | Method for monitoring and/or controlling and/or regulating functions of and in injection moulding machines |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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DE102008037694 | 2008-08-14 | ||
DE102008037694.9 | 2008-08-14 | ||
DE102009011334.7 | 2009-03-05 | ||
DE102009011334 | 2009-03-05 | ||
DE102009014311A DE102009014311A1 (en) | 2008-08-14 | 2009-03-25 | Method for monitoring and / or controlling and / or regulating functions of and in injection molding machines |
Publications (1)
Publication Number | Publication Date |
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DE102009014311A1 true DE102009014311A1 (en) | 2010-02-18 |
Family
ID=41528279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE102009014311A Withdrawn DE102009014311A1 (en) | 2008-08-14 | 2009-03-25 | Method for monitoring and / or controlling and / or regulating functions of and in injection molding machines |
Country Status (2)
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DE (1) | DE102009014311A1 (en) |
WO (1) | WO2010017970A2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011051200A1 (en) * | 2011-06-20 | 2012-12-20 | Priamus System Technologies Ag | Sensor e.g. temperature sensors for determining temperature of metal flux in cavity of injection molding tool, has protection elements that are fixed on front sides of sensor elements by pin, for protecting sensor elements |
WO2018005026A1 (en) * | 2016-06-30 | 2018-01-04 | iMFLUX Inc. | Method for evenly distributing plastic melt in a hot runner system using strain gauges |
EP3632651A1 (en) * | 2018-10-01 | 2020-04-08 | Chung Yuan Christian University | Injection molding apparatus |
AT522798B1 (en) * | 2019-10-09 | 2021-02-15 | Engel Austria Gmbh | Measuring arrangement for a molding machine |
US10974430B2 (en) | 2017-05-02 | 2021-04-13 | iMFLUX Inc. | Method for controlling a rate or force of a clamp in a molding system using one or more strain gauges |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8715547B2 (en) | 2011-02-24 | 2014-05-06 | Mold-Masters (2007) Limited | Closed loop control of auxiliary injection unit |
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DE3425459A1 (en) | 1984-07-11 | 1986-01-23 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR MONITORING AND / OR CONTROLLING INJECTION MOLDING IN INJECTION MOLDING MACHINES |
DE10112126A1 (en) | 2001-03-14 | 2002-12-05 | Frey Juergen | Process for automatically balancing the volumetric filling of cavities |
DE10155162A1 (en) | 2001-11-12 | 2003-05-22 | Priamus System Technologies Ag | Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection path |
DE102004031546A1 (en) | 2004-06-29 | 2006-02-09 | Priamus System Technologies Ag | Method for filling at least one cavity |
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JP2695116B2 (en) * | 1994-07-14 | 1997-12-24 | 日精樹脂工業株式会社 | Nesting mold equipment |
JPH08118387A (en) * | 1994-09-01 | 1996-05-14 | Sumitomo Chem Co Ltd | Manufacture of thermoplastic molded body |
JP3842868B2 (en) * | 1997-05-26 | 2006-11-08 | 松下電工株式会社 | Injection molding method and apparatus |
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2009
- 2009-03-25 DE DE102009014311A patent/DE102009014311A1/en not_active Withdrawn
- 2009-08-12 WO PCT/EP2009/005835 patent/WO2010017970A2/en active Application Filing
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DE3425459A1 (en) | 1984-07-11 | 1986-01-23 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR MONITORING AND / OR CONTROLLING INJECTION MOLDING IN INJECTION MOLDING MACHINES |
DE10112126A1 (en) | 2001-03-14 | 2002-12-05 | Frey Juergen | Process for automatically balancing the volumetric filling of cavities |
DE10155162A1 (en) | 2001-11-12 | 2003-05-22 | Priamus System Technologies Ag | Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection path |
DE102004031546A1 (en) | 2004-06-29 | 2006-02-09 | Priamus System Technologies Ag | Method for filling at least one cavity |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011051200A1 (en) * | 2011-06-20 | 2012-12-20 | Priamus System Technologies Ag | Sensor e.g. temperature sensors for determining temperature of metal flux in cavity of injection molding tool, has protection elements that are fixed on front sides of sensor elements by pin, for protecting sensor elements |
WO2018005026A1 (en) * | 2016-06-30 | 2018-01-04 | iMFLUX Inc. | Method for evenly distributing plastic melt in a hot runner system using strain gauges |
US10538023B2 (en) | 2016-06-30 | 2020-01-21 | iMFLUX Inc. | Method for evenly distributing plastic melt in a hot runner system using strain gauges |
US10814540B2 (en) | 2016-06-30 | 2020-10-27 | iMFLUX Inc. | Method for evenly distributing plastic melt in a hot runner system using strain gauges |
US10974430B2 (en) | 2017-05-02 | 2021-04-13 | iMFLUX Inc. | Method for controlling a rate or force of a clamp in a molding system using one or more strain gauges |
US11618197B2 (en) | 2017-05-02 | 2023-04-04 | iMFLUX Inc. | Method for controlling a rate or force of a clamp in a molding system using one or more strain gauges |
EP3632651A1 (en) * | 2018-10-01 | 2020-04-08 | Chung Yuan Christian University | Injection molding apparatus |
AT522798B1 (en) * | 2019-10-09 | 2021-02-15 | Engel Austria Gmbh | Measuring arrangement for a molding machine |
AT522798A4 (en) * | 2019-10-09 | 2021-02-15 | Engel Austria Gmbh | Measuring arrangement for a molding machine |
Also Published As
Publication number | Publication date |
---|---|
WO2010017970A2 (en) | 2010-02-18 |
WO2010017970A3 (en) | 2011-03-17 |
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