DE102005015491A1 - Method for injection moulding of plastics with monitored rate of change of pressure with displacement for accurate determination of backing pressure during cooling phase - Google Patents
Method for injection moulding of plastics with monitored rate of change of pressure with displacement for accurate determination of backing pressure during cooling phase Download PDFInfo
- Publication number
- DE102005015491A1 DE102005015491A1 DE200510015491 DE102005015491A DE102005015491A1 DE 102005015491 A1 DE102005015491 A1 DE 102005015491A1 DE 200510015491 DE200510015491 DE 200510015491 DE 102005015491 A DE102005015491 A DE 102005015491A DE 102005015491 A1 DE102005015491 A1 DE 102005015491A1
- Authority
- DE
- Germany
- Prior art keywords
- pressure
- change
- melt
- gradient
- injection
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000004033 plastic Substances 0.000 title claims abstract description 10
- 229920003023 plastic Polymers 0.000 title claims abstract description 10
- 238000001816 cooling Methods 0.000 title claims abstract description 8
- 238000001746 injection moulding Methods 0.000 title claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 title abstract 2
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 20
- 239000000155 melt Substances 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 4
- 238000010137 moulding (plastic) Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000011346 highly viscous material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 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
- 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
- B29C2945/76494—Controlled parameter
- B29C2945/76498—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
- B29C2945/76655—Location of control
- B29C2945/76732—Mould
- B29C2945/76735—Mould cavity
-
- 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
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 Spritzgießen von Kunststoffformteilen, das die Schritte umfasst: a) Plastifizieren von Kunststoff in einer Plastifizier- und Einspritzschnecke, b) Einspritzen von plastischer Masse mittels der Einspritzschnecke, c) wobei ein bestimmter erster Schmelzedruck erzeugt wird, um eine Kavität eines Spritzgießwerkzeuges volumetrisch zu füllen, d) Überwachen des Schmelzedruckes durch Messen, e) Ändern des Schmelzedruckes auf einen zweiten bestimmten Schmelzedruck, um der materialabhängigen Schwindung beim Abkühlen entgegenzuwirken.The Invention relates to a method for injection molding plastic moldings, comprising the steps of: a) plasticizing plastic in a plasticizer and injection screw, b) injection of plastic mass by means of the injection screw, c) wherein a certain first melt pressure is generated to a cavity an injection mold fill volumetrically, d) Monitor the melt pressure by measuring, e) changing the melt pressure on a second specific melt pressure to the material-dependent shrinkage on cooling counteract.
Bei der Herstellung von Kunststoffteilen wird klassifizierte Kunststoffmasse in ein Werkzeug eingebracht. Nachdem die Kavität volumetrisch gefällt ist steigt der Druck in der Schmelze stärker an. Dieser Druck ist meist höher als er für die Formfüllung erforderlich wäre, es tritt somit eine Druckspitze auf. Dieser plötzliche Druckanstieg wird heute als Kenngröße genutzt, um vom Einspritzdruck auf den Nachdruck umzuschalten, um ausreichend Material nachzuführen, welches durch Schwindung während des Abkühlprozesses vom Kavitätsvolumen verloren geht.at The production of plastic parts is classified plastic mass placed in a tool. After the cavity is volumetrically precipitated increases the pressure in the melt stronger at. This pressure is usually higher as he for the mold filling would be required It thus occurs on a pressure peak. This sudden increase in pressure is today used as a parameter, to switch from the injection pressure to the holding pressure to sufficient Track material, which by shrinkage during the cooling process from the cavity volume get lost.
Sind jedoch nun Fließeigenschaften des Kunststoffes aufgrund von Chargenschwankungen bei der Herstellung unterschiedlich, müssen die Umschaltwerte (Zeit, Weg oder Druck) nachjustiert werden, um ein Überspritzen der Form bei Viskositätsabnahme oder ein unvollständiges Formfüllen bei Viskositätszunahme zu verhindern.are but now flow properties of the plastic due to batch variations in production different, must the switching values (time, distance or pressure) are readjusted to an overspray the mold with viscosity decrease or an incomplete one form filling at viscosity increase to prevent.
Die Aufgabe der Erfindung liegt darin, ein verbessertes Verfahren anzubieten, bei dem das Umschalten von Einspritzdruck auf Nachdruck in Abhängigkeit der Materialeigenschaften erfolgen kann.The The object of the invention is to provide an improved process, in which the switching from injection pressure to holding pressure in dependence the material properties can be done.
Die Lösung der Aufgabe ist in Verbindung mit dem Oberbegriff des Anspruches 1 dadurch gekennzeichnet, dass nach dem Schritt c), also nach dem volumetrischen Füllen, der Druckgradient aus Druck und Zeit oder Druck und Wegeinheit ermittelt wird und dann die Änderung vom ersten Schmelzedruck, also dem Einspritzdruck, auf den zweiten Schmelzedruck, den Nachdruck in Abhängigkeit dieses ermittelten Druckgradienten erfolgt.The solution the object is in connection with the preamble of the claim 1, characterized in that after step c), ie after the volumetric To fill, the pressure gradient of pressure and time or pressure and path unit determined and then the change from the first melt pressure, ie the injection pressure, to the second Melt pressure, the reprint depending on this determined Pressure gradient occurs.
Der Druckgradient ist hauptsächlich abhängig von der Type des Materials, genauer von den elastischen Eigenschaften. Ist die Kavität volumetrisch gefüllt, so wirkt das Massepolster vor der Schneckenspitze wie eine Feder, die eine gewisse Federkonstante besitzt und komprimiert wird. „Weiche" Materialien in dieser Hinsicht sind beispielsweise ungefüllte Polyolefine, „harte" Materialien sind beispielsweise hochgefüllte Polyamide oder Metallfeedstocks.Of the Pressure gradient is mainly dependent on the type of material, more precisely on the elastic properties. Is the cavity volumetrically filled, so the mass cushion in front of the screw tip acts like a spring, which has a certain spring constant and is compressed. "Soft" materials in this For example, unfilled polyolefins are "hard" materials for example, highly filled Polyamides or metal feedstocks.
Weiterbildungsgemäß ist vorgesehen dass der ermittelte Druckgradient mit einem in der Maschinensteuerung hinterlegten materialspezifischen Druckgradienten verglichen wird.Further education is provided that the determined pressure gradient with a in the machine control deposited material-specific pressure gradient is compared.
Vorteilhafterweise wird der materialspezifische Druckgradient experimentell ermittelt und als Master in der Maschinensteuerung hinterlegt, um dann für die Änderungen des Schmelzedruckes verwendet zu werden.advantageously, the material-specific pressure gradient is determined experimentally and deposited as master in the machine control, then for the changes the melt pressure to be used.
Die experimentell ermittelten Druckgradienten können in einer Materialdatenbank eingepflegt werden, so dass bei Auswahl des entsprechenden Materialtyps der Umschaltdruckgradient in der Maschinensteuerung automatisch gesetzt wird.The experimentally determined pressure gradients can be found in a material database be entered, so that when selecting the appropriate material type the switching pressure gradient in the machine control automatically is set.
Dieses erfindungsgemäße neuartige Verfahren hat den Vorteil, dass das Umschalten von Einspritzdruck auf Nachdruck nicht in Abhängigkeit des zu füllenden Volumens der Werkzeugkavität, sondern von dem eingespritzten Material abhängig ist.This inventive novel Method has the advantage that the switching of injection pressure on reprint not dependent of the to be filled Volume of the mold cavity, but depends on the injected material.
Zur Verdeutlichung des Verfahrens werden drei Figuren dargelegt, es zeigtto Clarification of the method, three figures are presented, it shows
In
der
Die
Somit kann festgestellt werden, dass einmal für ein Material festgehaltener bzw. ermittelter Druckgradient unabhängig von der vorherrschenden Viskosität im Material konstant bleibt. Folglich ist der materialspezifische Druckgradient eine geeignetere Größe für die Festlegung des Umschaltpunktes zwischen Einspritzdruck und Nachdruck. Die anfangs erwähnten Nachteile können somit vermieden werden.Consequently can be stated once detained for a material or determined pressure gradient independent of the prevailing viscosity remains constant in the material. Consequently, the material specific Pressure gradient a more suitable size for the determination of the switching point between injection pressure and holding pressure. The disadvantages mentioned at the beginning can thus be avoided.
- 11
- Druckverlaufskurve allgemeinPressure curve generally
- 22
- Druckspitzepressure peak
- 33
- Druckverlaufskurve von hochviskosem MaterialPressure curve of highly viscous material
- 44
- Druckverlaufskurve von niedrigviskosem MaterialPressure curve of low viscosity material
- 55
- EinspritzbereichInjection region
- 66
- Nachdruckbereichreprint area
- 77
- Kühlbereichcooling area
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510015491 DE102005015491B4 (en) | 2005-04-05 | 2005-04-05 | injection molding |
AT3042006A AT501952A3 (en) | 2005-04-05 | 2006-02-23 | METHOD FOR INJECTION MOLDING OF PLASTIC MOLDED PARTS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510015491 DE102005015491B4 (en) | 2005-04-05 | 2005-04-05 | injection molding |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102005015491A1 true DE102005015491A1 (en) | 2006-10-19 |
DE102005015491B4 DE102005015491B4 (en) | 2006-12-07 |
Family
ID=37055201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200510015491 Expired - Fee Related DE102005015491B4 (en) | 2005-04-05 | 2005-04-05 | injection molding |
Country Status (2)
Country | Link |
---|---|
AT (1) | AT501952A3 (en) |
DE (1) | DE102005015491B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007035804B3 (en) * | 2007-07-31 | 2009-05-20 | Siemens Ag | Control method for a plastic injection molding machine to compensate for batch fluctuations |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1729382A1 (en) * | 1968-02-14 | 1971-10-07 | Wissenschaftlich Tech Zentrum | Method and device for processing moldable materials on injection molding machines |
US3642404A (en) * | 1968-11-21 | 1972-02-15 | Meiki Seisakusho Kk | Injection-molding machine |
DE2939067A1 (en) * | 1979-09-27 | 1981-04-02 | Vereinigung zur Förderung des Instituts für Kunststoffverarbeitung in Industrie und Handwerk an der Rhein.-Westf. Technischen Hochschule Aachen e.V., 5100 Aachen | Automatic pressure control system in injection moulding - in which additional regulator is interposed between injection and final pressure controllers |
EP0315999A2 (en) * | 1987-11-11 | 1989-05-17 | Vereinigung Zur Förderung Des Instituts Für Kunststoffverarbeitung In Industrie Und Handwerk | Method for reproducible mould filling with moulding materials |
DE19536566C1 (en) * | 1995-10-02 | 1997-02-06 | Arburg Gmbh & Co | Process for controlling the cavity pressure on a cyclically operating machine |
DE4140392C2 (en) * | 1991-12-07 | 1997-02-20 | Bosch Gmbh Robert | Process for controlling an injection molding process |
DE19834085C1 (en) * | 1998-07-29 | 1999-11-25 | Battenfeld Gmbh | Injection molding of plastic components |
DE19913527C2 (en) * | 1999-03-25 | 2001-09-27 | Battenfeld Gmbh | Method and device for compensating the measured value drift of a melt pressure sensor |
US6309571B2 (en) * | 1998-02-27 | 2001-10-30 | The Hong Kong University Of Science & Technology | Method and apparatus for the control of injection molding |
-
2005
- 2005-04-05 DE DE200510015491 patent/DE102005015491B4/en not_active Expired - Fee Related
-
2006
- 2006-02-23 AT AT3042006A patent/AT501952A3/en not_active Application Discontinuation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1729382A1 (en) * | 1968-02-14 | 1971-10-07 | Wissenschaftlich Tech Zentrum | Method and device for processing moldable materials on injection molding machines |
US3642404A (en) * | 1968-11-21 | 1972-02-15 | Meiki Seisakusho Kk | Injection-molding machine |
DE2939067A1 (en) * | 1979-09-27 | 1981-04-02 | Vereinigung zur Förderung des Instituts für Kunststoffverarbeitung in Industrie und Handwerk an der Rhein.-Westf. Technischen Hochschule Aachen e.V., 5100 Aachen | Automatic pressure control system in injection moulding - in which additional regulator is interposed between injection and final pressure controllers |
EP0315999A2 (en) * | 1987-11-11 | 1989-05-17 | Vereinigung Zur Förderung Des Instituts Für Kunststoffverarbeitung In Industrie Und Handwerk | Method for reproducible mould filling with moulding materials |
DE4140392C2 (en) * | 1991-12-07 | 1997-02-20 | Bosch Gmbh Robert | Process for controlling an injection molding process |
DE19536566C1 (en) * | 1995-10-02 | 1997-02-06 | Arburg Gmbh & Co | Process for controlling the cavity pressure on a cyclically operating machine |
US6309571B2 (en) * | 1998-02-27 | 2001-10-30 | The Hong Kong University Of Science & Technology | Method and apparatus for the control of injection molding |
DE19834085C1 (en) * | 1998-07-29 | 1999-11-25 | Battenfeld Gmbh | Injection molding of plastic components |
DE19913527C2 (en) * | 1999-03-25 | 2001-09-27 | Battenfeld Gmbh | Method and device for compensating the measured value drift of a melt pressure sensor |
Also Published As
Publication number | Publication date |
---|---|
DE102005015491B4 (en) | 2006-12-07 |
AT501952A3 (en) | 2008-07-15 |
AT501952A2 (en) | 2006-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: ADCURAM MASCHINENBAUHOLDING GMBH, 80333 MUENCHEN, DE |
|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |