DE3917361A1 - Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full - Google Patents

Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full

Info

Publication number
DE3917361A1
DE3917361A1 DE19893917361 DE3917361A DE3917361A1 DE 3917361 A1 DE3917361 A1 DE 3917361A1 DE 19893917361 DE19893917361 DE 19893917361 DE 3917361 A DE3917361 A DE 3917361A DE 3917361 A1 DE3917361 A1 DE 3917361A1
Authority
DE
Germany
Prior art keywords
mould
sensor
distance measuring
measuring system
full
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Withdrawn
Application number
DE19893917361
Other languages
German (de)
Inventor
Des Erfinders Auf Nennung Verzicht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MEL MIKROELEKTRONIK GmbH
Original Assignee
MEL MIKROELEKTRONIK GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MEL MIKROELEKTRONIK GmbH filed Critical MEL MIKROELEKTRONIK GmbH
Priority to DE19893917361 priority Critical patent/DE3917361A1/en
Publication of DE3917361A1 publication Critical patent/DE3917361A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/80—Measuring, controlling or regulating of relative position of mould parts
    • 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
    • B29C45/7613—Measuring, controlling or regulating the termination of flow of material into the mould

Abstract

To monitor the exact moment, when the mould of a plastic injection moulding machine is completely filled, a distance sensor (1) is attached to one half of the mould (6). An angle (2) is fixed across the parting joint (8) on the other half to act as a reference plane. The sensor readings are passed to an electronic unit (5) which displays the measured value (3). A set distance (in mu) is set by a setting unit (4) and as soon as the reading exceeds this value (due to the mould being full) the power to the extruder (9) is cut off by the unit (7). ADVANTAGE - This ensures that the mould is neither under-nor over-filled and produces mouldings of uniform quality.

Description

Die Erfindung bezieht sich auf ein Zubehör für Spritzgußmaschi­ nen. Dies können Kunststoffspritzgußmaschinen sein oder auch andere. Bei Spritzgußmaschinen wird zähflüssiges Material in eine vorgegebene Form (6) eingepreßt. Hierbei besteht das Problem, die Form (6) voll auszupressen. Es darf keine Unterfüllung aber auch keine Überfüllung eintreten. Die Regelung dieses Vorgangs erfolgt bisher über druck- und zeitabhängige Steuerungen, da die zu pres­ senden Massen jedoch unterschiedlichste Eigenschaften haben und auch während des Druckvorgangs oft unvorhersehbare Umstände im Fließverhalten auftreten, ist es nach wie vor ein Problem, höhere Genauigkeiten bei den Spritzgußteilen zu erreichen bzw. eine geringe Ausschußquote zu erzielen.The invention relates to an accessory for injection molding machines. These can be plastic injection molding machines or others. In the case of injection molding machines, viscous material is pressed into a predetermined shape ( 6 ). The problem here is to fully squeeze out the form ( 6 ). There must be no underfilling or overfilling. Up to now, this process has been controlled via pressure- and time-dependent controls, since the masses to be pressed, however, have very different properties and, even during the printing process, unpredictable circumstances in the flow behavior often occur, it is still a problem to achieve higher accuracies in the injection molded parts or to achieve a low reject rate.

Das vorgeschlagene Meßsystem erfaßt nun direkt den kurzen Moment der vollausgefüllten Form und kann in diesem Moment ein exaktes Signal an die Steuerung des Spritzvorgangs geben.The proposed measuring system now captures the short moment directly the fully filled form and can be an exact at this moment Give a signal to the control of the spraying process.

Hierzu wird ein berührungslos wirkender Abstandsensor (1) mit hoher Meßgenauigkeit und Reproduzierbarkeit an einer Formenhälfte befestigt und mißt den Abstand zur Referenzebene (2) die an der anderen Formenhälfte befestigt ist.For this purpose, a non-contact distance sensor ( 1 ) with high measuring accuracy and reproducibility is attached to one half of the mold and measures the distance to the reference plane ( 2 ) which is attached to the other half of the mold.

Der Meßwert des Abstandssensors wird in der nachgeschalteten Elektronik (5) ausgewertet und mit dem Sollwert des digital einstellbaren Abschaltpunktes (4) verglichen, sobald der Meßwert größer als der Sollwert ist wird ein Abschaltsignal an den Druckabschalter (7) der Spritzsteuerung gegeben. The measured value of the distance sensor is evaluated in the downstream electronics ( 5 ) and compared with the setpoint of the digitally adjustable switch-off point ( 4 ), as soon as the measured value is greater than the setpoint a switch-off signal is given to the pressure switch ( 7 ) of the spray control.

Kommt der Spritzvorgang zum Ende, so weitet sich die Trennebene (8) bei voll ausgefüllter Form schlagartig im µm-Bereich. Es ergibt sich ein höherer Meßwert des Sensors bis hieraus das Abschaltsignal an die Spritzmaschine resultiert.When the spraying process comes to an end, the parting line ( 8 ) suddenly widens in the µm range when the mold is fully filled. There is a higher measured value of the sensor until the shutdown signal to the spraying machine results.

Durch die Einstellung des Abschaltpunktes (4) kann die Formfüllung in kleinen Bereichen exakt einjustiert werden.By setting the switch-off point ( 4 ), the mold filling can be precisely adjusted in small areas.

Um die größeren Temperaturschwankungen, die an den Spritzgußfor­ men auftreten können, verbunden mit entsprechenden termischen Ausdehnungen, zu kompensieren, sieht das System eine automatische Nullpunktkorrektur vor jedem Spritzvorgang nach Schließen der Form vor. Hierzu wird nach Schließen der Form ein Nullpunktsignal von der Spritzgußsteuerung an die Auswertelektronik (5) gegeben.In order to compensate for the larger temperature fluctuations that can occur on the injection molding, combined with corresponding thermal expansions, the system provides an automatic zero point correction before each injection process after the mold is closed. For this purpose, a zero point signal is sent from the injection molding control to the evaluation electronics ( 5 ) after the mold has been closed.

Claims (6)

1. Abstandsmeßsystem zur Überwachung der Formenöffnung von Spritzgußformen am Ende des Spritzvorgangs, gekennzeichnet dadurch, daß ein abstandsmessender Sensor (1) auf der einen Formhälfte (6) und eine Referenzebene (2) auf der anderen Form­ hälfte (6) befestigt wird und die Formenöffnung mit hoher Genauigkeit erfaßt.1. Distance measuring system for monitoring the mold opening of injection molds at the end of the injection process, characterized in that a distance measuring sensor ( 1 ) on one mold half ( 6 ) and a reference plane ( 2 ) on the other mold half ( 6 ) is attached and the mold opening detected with high accuracy. 2. Abstandsmeßsystem nach Anspruch 1, gekennzeichnet dadurch, daß der Abstandssensor (1) berührungslos arbeitet.2. Distance measuring system according to claim 1, characterized in that the distance sensor ( 1 ) works without contact. 3. Abstandsmeßsystem, gekennzeichnet dadurch, daß der Abstandssensor (1) als induktiver Wegsensor aufgebaut ist.3. Distance measuring system, characterized in that the distance sensor ( 1 ) is constructed as an inductive displacement sensor. 4. Abstandsmeßsystem, gekennzeichnet dadurch, daß der Nullpunkt des Meßvorgangs nach jedem Schließen der Form automatisch neu gesetzt wird.4. distance measuring system, characterized in that the zero point of the measuring process automatically every time the mold is closed is set. 5. Abstandsmeßsystem, gekennzeichnet dadurch, daß das System bei einem einstellbaren Abschaltpunkt (4) ein Schaltsignal abgibt.5. Distance measuring system, characterized in that the system emits a switching signal at an adjustable switch-off point ( 4 ). 6. Abstandsmeßsystem nach Anspruch 1, gekennzeichnet dadurch, daß die Anzeige des Meßwerts (3) und des Abschaltpunkts (4) digi­ tal in µm erfolgt.6. Distance measuring system according to claim 1, characterized in that the display of the measured value ( 3 ) and the switch-off point ( 4 ) takes place digitally in µm.
DE19893917361 1989-03-01 1989-05-29 Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full Withdrawn DE3917361A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893917361 DE3917361A1 (en) 1989-03-01 1989-05-29 Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8902444 1989-03-01
DE19893917361 DE3917361A1 (en) 1989-03-01 1989-05-29 Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full

Publications (1)

Publication Number Publication Date
DE3917361A1 true DE3917361A1 (en) 1990-09-06

Family

ID=25881347

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893917361 Withdrawn DE3917361A1 (en) 1989-03-01 1989-05-29 Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full

Country Status (1)

Country Link
DE (1) DE3917361A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339520C1 (en) * 1993-11-19 1995-01-12 Hasco Normalien Hasenclever Co Mould for processing plastic compositions, in particular a plastics injection mould
EP0712710A1 (en) * 1994-11-18 1996-05-22 Krauss-Maffei Aktiengesellschaft Injection moulding machine
DE10141858A1 (en) * 2001-08-27 2003-03-20 Krauss Maffei Kunststofftech Method and device for producing flat plastic molded parts, in particular plastic panes
GB2431565A (en) * 2004-08-17 2007-05-02 High Voltage Pulse Technology Protective article of outer clothing
DE202012104175U1 (en) 2012-07-12 2012-11-23 Micro-Epsilon Optronic Gmbh Sensor for the contactless measurement of a distance and / or a profile
DE102013101997A1 (en) 2012-03-02 2013-09-05 Kraussmaffei Technologies Gmbh Method for operating injection molding machine, involves monitoring position of vent gaps continuously during operation of injection molding machine, where gap or forming of both mold halves is measured in closed state from time to time
DE102017100410A1 (en) 2017-01-11 2018-07-12 Schneider Form Gmbh System and method for measuring and controlling a size of a multi-plate forming tool
EP3760409A1 (en) * 2019-07-05 2021-01-06 Nissei Plastic Industrial Co., Ltd. Foam molding method and injection molding machine
US20220274307A1 (en) * 2021-03-01 2022-09-01 Alcon Inc. Method for verifying the accurate mounting of molding inserts to a tooling plate of an injection-molding apparatus for molding ophthalmic lens molds

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2443938A1 (en) * 1973-10-10 1975-04-24 Bucher Guyer Ag Masch METHOD FOR REGULATING THE DEGREE OF MOLD FILLING IN INJECTION MOLDING MACHINES AND DEVICE FOR IMPLEMENTING THESE
DE2848173A1 (en) * 1978-11-07 1980-06-12 Teldix Gmbh Compact position sensor arrangement for magnetic rotor bearing - contg. inductive axial and radial displacement feedback sensors
DE3303994A1 (en) * 1982-02-17 1983-08-25 Deutsche Itt Industries Gmbh, 7800 Freiburg POSITION MEASURING DEVICE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2443938A1 (en) * 1973-10-10 1975-04-24 Bucher Guyer Ag Masch METHOD FOR REGULATING THE DEGREE OF MOLD FILLING IN INJECTION MOLDING MACHINES AND DEVICE FOR IMPLEMENTING THESE
DE2848173A1 (en) * 1978-11-07 1980-06-12 Teldix Gmbh Compact position sensor arrangement for magnetic rotor bearing - contg. inductive axial and radial displacement feedback sensors
DE3303994A1 (en) * 1982-02-17 1983-08-25 Deutsche Itt Industries Gmbh, 7800 Freiburg POSITION MEASURING DEVICE

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339520C1 (en) * 1993-11-19 1995-01-12 Hasco Normalien Hasenclever Co Mould for processing plastic compositions, in particular a plastics injection mould
EP0712710A1 (en) * 1994-11-18 1996-05-22 Krauss-Maffei Aktiengesellschaft Injection moulding machine
US5846574A (en) * 1994-11-18 1998-12-08 Krauss-Maffei Aktiengesellschaft Mold-actuating apparatus
DE10141858A1 (en) * 2001-08-27 2003-03-20 Krauss Maffei Kunststofftech Method and device for producing flat plastic molded parts, in particular plastic panes
DE10141858B4 (en) * 2001-08-27 2010-06-17 Kraussmaffei Technologies Gmbh Method and device for producing sheet-like plastic molded parts, in particular plastic discs
US7824597B2 (en) 2001-08-27 2010-11-02 Kraussmaffei Technologies Gmbh Method and apparatus for making flat molded plastic articles
GB2431565A (en) * 2004-08-17 2007-05-02 High Voltage Pulse Technology Protective article of outer clothing
GB2431565B (en) * 2004-08-17 2009-12-23 High Voltage Pulse Technology Protective article of outer clothing
DE102013101997A1 (en) 2012-03-02 2013-09-05 Kraussmaffei Technologies Gmbh Method for operating injection molding machine, involves monitoring position of vent gaps continuously during operation of injection molding machine, where gap or forming of both mold halves is measured in closed state from time to time
DE202012104175U1 (en) 2012-07-12 2012-11-23 Micro-Epsilon Optronic Gmbh Sensor for the contactless measurement of a distance and / or a profile
DE102017100410A1 (en) 2017-01-11 2018-07-12 Schneider Form Gmbh System and method for measuring and controlling a size of a multi-plate forming tool
DE102017100410B4 (en) * 2017-01-11 2020-09-24 Schneider Form Gmbh Measuring system for measuring and regulating the formatting of a multi-plate forming tool
EP3760409A1 (en) * 2019-07-05 2021-01-06 Nissei Plastic Industrial Co., Ltd. Foam molding method and injection molding machine
US11584050B2 (en) 2019-07-05 2023-02-21 Nissei Plastic Industry Co., Ltd. Foam molding method and injection molding machine
US11826933B2 (en) 2019-07-05 2023-11-28 Nissei Plastic Industry Co., Ltd. Foam molding method and injection molding machine
US20220274307A1 (en) * 2021-03-01 2022-09-01 Alcon Inc. Method for verifying the accurate mounting of molding inserts to a tooling plate of an injection-molding apparatus for molding ophthalmic lens molds

Similar Documents

Publication Publication Date Title
US4161380A (en) Injection molding process control
US4146601A (en) Injection molding process control
US4559991A (en) Method and system of controlling injection molding machines
DE10112126B4 (en) Process for automatically balancing the volumetric filling of cavities
DE102005032367A1 (en) Method for monitoring and / or regulating the melt filling of at least one cavity
DE2417986A1 (en) DYNAMIC PRESSURE REGULATING DEVICE
DE102015117237B3 (en) Method for determining a real volume of an injection-moldable mass in an injection molding process
AT403328B (en) METHOD AND DEVICE FOR CONTROLLING AN INJECTION MOLDING PROCESS
DE3917361A1 (en) Cut-off sensor for injection moulding machine - responds to distance changes between mould halves due to mould being full
US5017315A (en) Method and apparatus of judging quality of injection molded products
DE2358911A1 (en) Controlling injection moulding stroke speed - as function of pressure temperature and speed of flow front in mould
DE2826060A1 (en) METAL FORMING OPERATING PROCEDURE AND DEVICE IN LOW PRESSURE CASTING
DE2401168B2 (en) PLASTIC INJECTION MOLDING MACHINE FOR MANUFACTURING INJECTION MOLDED PARTS, WITH A HEATING, A PRESSURE MEASURING AND A CONTROL DEVICE
CA1309818C (en) Apparatus for precision volumetric control of a moldable material in an injection molding process
DE4002398A1 (en) Control of injection moulding machine to optimise casting conditions - by monitoring temp. and altering casting conditions in response to any temp. changes
CA1290524C (en) Method of precision volumetric control of a moldable material in an injection molding process
DE3801216C2 (en)
WO2004058476A2 (en) Method for controlling the production of injection molded parts
EP0076010B1 (en) Apparatus for the optimization of an injection moulding process
DE3927995A1 (en) METHOD FOR CONTROLLING THE REPRINTING PHASE IN INJECTION MOLDING THERMOPLASTIC PLASTICS
DE2539066A1 (en) DETERMINATION OF THE SOLIDIZATION PHASE IN INJECTION MOLDING MACHINES
EP0310905B1 (en) Method of controlling an injection moulding machine and injection moulding machine for executing this method
EP0315999B1 (en) Method for reproducible mould filling with moulding materials
DE2543088C3 (en) Method for controlling an injection molding machine
DE2605037A1 (en) METHOD AND DEVICE FOR CYCLICAL INJECTION MOLDING OF PLASTIC MOLDED PARTS

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8139 Disposal/non-payment of the annual fee