DE10116998A1 - Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection path - Google Patents
Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection pathInfo
- Publication number
- DE10116998A1 DE10116998A1 DE10116998A DE10116998A DE10116998A1 DE 10116998 A1 DE10116998 A1 DE 10116998A1 DE 10116998 A DE10116998 A DE 10116998A DE 10116998 A DE10116998 A DE 10116998A DE 10116998 A1 DE10116998 A1 DE 10116998A1
- Authority
- DE
- Germany
- Prior art keywords
- determined
- melt
- injection
- over
- mold
- 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.)
- Withdrawn
Links
- 238000002347 injection Methods 0.000 title description 4
- 239000007924 injection Substances 0.000 title description 4
- 239000000155 melt Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 12
- 238000001746 injection moulding Methods 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 abstract 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- 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
- 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
- B29C2045/776—Measuring, controlling or regulating of velocity or pressure of moulding material determining the switchover point to the holding pressure
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
Description
Die Erfindung betrifft ein Verfahren zum Füllen einer Kavität eines Werkzeuges zum Herstellen eines Formteiles aus einer Schmelze, insbesondere einer Kavität einer Spritzgießmaschine, wobei die Schmelze unter Druck in die Kavität eingeführt und gegen Ende oder am Ende ihres Fließweges unter Nachdruck gesetzt wird.The invention relates to a method for filling a Cavity of a tool for producing a molded part from a melt, in particular a cavity Injection molding machine, the melt under pressure in the Cavity introduced and towards the end or at the end of it Flow path is under pressure.
Beim Spritzgießen oder beispielsweise auch beim Druckgießen wird die Kavität in einem Werkzeug mit einer Schmelze, insbesondere aus Kunststoff, Metall oder einer Keramik, gefüllt. Dieser Einfüllvorgang geschieht so lange, bis die Kavität gefüllt ist, danach erfolgt ein Umschalten auf die sogenannte Nachdruckphase, in der vor allem auch ein Schwinden des Werkstoffes in der Kavität ausgeglichen wird.During injection molding or, for example, during The cavity is die cast in one tool with one Melt, in particular made of plastic, metal or one Ceramic, filled. This filling process takes place as long as until the cavity is filled, then there is a switchover on the so-called reprint phase, in which above all a shrinkage of the material in the cavity is compensated becomes.
Wichtig ist eine Bestimmung des Umschaltzeitpunktes von der Einfüll- zu der Nachdruckphase. Eine manuelle Optimierung ist schwierig und zeitaufwendig, weshalb sie in der Praxis nur selten korrekt durchgeführt wird.It is important to determine the time of switching from Filling to the reprint phase. A manual optimization is difficult and time consuming, which is why it is in practice is rarely performed correctly.
Eine fixe Umschaltung vom Einspritzvorgang auf den Nachdruckvorgang kann nicht auf prozessbedingte Schwankungen z. B. der Viskosität reagieren, was wiederum eine grosse Schwankung der Qualität der Formteile zur Folge hat.A fixed switch from the injection process to the Reprint process cannot be process-related Fluctuations z. B. react to the viscosity, which in turn a large fluctuation in the quality of the molded parts Has.
Beispielsweise in der EP 0 707 936 A2 oder der US 5 993 704 werden Verfahren zur Bestimmung des Umschaltzeitpunktes bei der Herstellung eines Spritzgussteils beschrieben. Sie dienen dazu, den Zeitpunkt der volumetrischen Füllung in der Werkzeugkavität automatisch zu ermitteln.For example in EP 0 707 936 A2 or US 5,993,704 are procedures for determining the switching time at described the manufacture of an injection molded part. she serve to fill in the time of volumetric automatically determine the tool cavity.
Die bestehenden Verfahren basieren in der Regel auf der Messung des Innendrucks. Beispielsweise wird der "Knickpunkt" zwischen der Einfüll- und der Nachdruckphase, der sich automatisch ergibt, mit Hilfe künstlicher Intelligenz ermittelt.The existing procedures are usually based on the Measurement of the internal pressure. For example, the "Kink point" between the filling and the holding pressure phase, which arises automatically with the help of artificial Intelligence determined.
In der Praxis hat sich allerdings ergeben, dass sich aufgrund der Rechenzeiten zum Teil zu große Verzögerungen ergeben, welche automatisch Druckspitzen und Verspannungen im Formteil nach sich ziehen. Außerdem können nicht alle Anwendungen universell abgedeckt werden. In practice, however, it has been found that delays that are too great due to the computing times result, which automatically pressure peaks and tensions in the molded part. Besides, not everyone can Applications are covered universally.
In einem weiteren Verfahren werden die Druckdifferenzen zwischen zwei Werkzeuginnendrucksensoren ermittelt und deren Verlauf über der Zeit analysiert. Über einen plötzlichen Abfall des Signals (= Knickpunkterkennung) wird die volumetrische Füllung ermittelt.In a further process, the pressure differences determined between two cavity pressure sensors and their course analyzed over time. About one sudden drop in the signal (= breakpoint detection) the volumetric filling is determined.
Beide oben beschriebenen Verfahren benötigen relativ teure Sensorik und Elektronik und sind nicht prozesssicher.Both of the methods described above require relatively expensive ones Sensors and electronics and are not reliable.
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, ein Verfahren der oben genannten Art zu entwickeln, mit dem auf einfache und kostengünstige Weise und dennoch relativ genau auf die Nachdruckphase umgeschaltet wird.The present invention is based on the object Develop the method of the type mentioned above with the simple and inexpensive way and yet relatively accurate is switched to the reprint phase.
Zur Lösung dieser Aufgabe führt, dass gegen Ende des Fließweges der Schmelze die Werkzeugwandtemperatur bestimmt und der Umschaltpunkt zur Nachdruckphase bestimmt wird.The solution to this problem is that towards the end of Flow path of the melt the mold wall temperature determined and the switchover point to the holding pressure phase determined becomes.
Das neue Verfahren beruht somit auf der Messung der Werkzeuginnenwandtemperatur am Fließwegende der Schmelze. Grundlegende Überlegung hierbei ist die Tatsache, dass theoretisch immer bei ca. 97 bis 98% des Fließweges umgeschaltet werden soll, um aufgrund der Trägheit schließlich die angestrebten 100% zu erreichen.The new method is therefore based on measuring the Mold inner wall temperature at the end of the flow path of the melt. The basic consideration here is the fact that theoretically always at approx. 97 to 98% of the flow path to be switched to due to inertia finally achieve the 100% target.
Erreicht die Schmelze die Position eines entsprechenden Thermoelementes, erfolgt ein schlagartiger Signalanstieg, der ohne weitere Intelligenz, z. B. als analoges Schaltsignal, verwendet werden kann.The melt reaches the position of a corresponding one Thermocouple, there is a sudden signal increase, who without further intelligence, e.g. B. as an analog Switching signal, can be used.
Da die Fließweglänge in allen Fällen dem Werkzeugbauer bekannt ist, kann eine entsprechende Vorgabe zur Positionierung eines kostengünstigen Thermoelementes ohne irgendwelche Schwierigkeiten gemacht werden.Since the flow path length in all cases the tool manufacturer is known, a corresponding specification for Positioning an inexpensive thermocouple without any difficulties are made.
Das Thermoelement kann neben der Funktion der Bestimmung des Umschaltzeitpunktes noch weitere Funktionen erfüllen. Beispielweise kann mit ihm eine Regelung der Schwindung, eine temperaturabhängige Kühlzeitregelung oder auch eine automatische Balancierung der volumetrischen Füllung der Kavität erfolgen.In addition to the function of the determination, the thermocouple can other functions at the time of switching. For example, it can regulate shrinkage, a temperature-dependent cooling time control or one automatic balancing of the volumetric filling of the Cavity.
Claims (2)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10116998A DE10116998A1 (en) | 2001-04-05 | 2001-04-05 | Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection path |
JP2002579196A JP4278986B2 (en) | 2001-04-05 | 2002-04-02 | Method for filling a mold cavity |
AT02730084T ATE288822T1 (en) | 2001-04-05 | 2002-04-02 | METHOD FOR FILLING THE CAVITY OF A TOOL |
PCT/EP2002/003609 WO2002081177A1 (en) | 2001-04-05 | 2002-04-02 | Method of filling the cavity of a tool |
EP02730084A EP1381502B1 (en) | 2001-04-05 | 2002-04-02 | Method of filling the cavity of a tool |
DE50202221.3T DE50202221C5 (en) | 2001-04-05 | 2002-04-02 | METHOD FOR FILLING THE CAVITY OF A TOOL |
US10/473,521 US7682535B2 (en) | 2001-04-05 | 2002-04-02 | Method of filling the cavity of a tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10116998A DE10116998A1 (en) | 2001-04-05 | 2001-04-05 | Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection path |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10116998A1 true DE10116998A1 (en) | 2002-12-19 |
Family
ID=7680507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10116998A Withdrawn DE10116998A1 (en) | 2001-04-05 | 2001-04-05 | Change-over to dwell pressure after injection into mold, is determined by temperature change measured near end of melt injection path |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10116998A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008038930A1 (en) | 2008-08-13 | 2010-02-18 | Priamus System Technologies Ag | Method for controlling or controlling functions of an injection molding machine |
US8920703B2 (en) | 2004-06-29 | 2014-12-30 | Priamus System Technologies Ag | Method for filling at least one cavity |
-
2001
- 2001-04-05 DE DE10116998A patent/DE10116998A1/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8920703B2 (en) | 2004-06-29 | 2014-12-30 | Priamus System Technologies Ag | Method for filling at least one cavity |
DE102008038930A1 (en) | 2008-08-13 | 2010-02-18 | Priamus System Technologies Ag | Method for controlling or controlling functions of an injection molding machine |
WO2010017940A1 (en) | 2008-08-13 | 2010-02-18 | Priamus System Technologies Ag | Method for regulating and/or controlling functions of an injection moulding machine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: PRIAMUS SYSTEM TECHNOLOGIES AG, SCHAFFHAUSEN, CH Owner name: PRIAMUS SYSTEM TECHNOLOGIES AG, SCHAFFHAUSEN, CH |
|
8139 | Disposal/non-payment of the annual fee |