WO2010138302A1 - Système de canal chauffant ayant un dispositif de commande pour déterminer le mouvement de tiges de soupape - Google Patents

Système de canal chauffant ayant un dispositif de commande pour déterminer le mouvement de tiges de soupape Download PDF

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Publication number
WO2010138302A1
WO2010138302A1 PCT/US2010/034461 US2010034461W WO2010138302A1 WO 2010138302 A1 WO2010138302 A1 WO 2010138302A1 US 2010034461 W US2010034461 W US 2010034461W WO 2010138302 A1 WO2010138302 A1 WO 2010138302A1
Authority
WO
WIPO (PCT)
Prior art keywords
controller
hot
valve stems
transducer assembly
runner system
Prior art date
Application number
PCT/US2010/034461
Other languages
English (en)
Inventor
Paul R. Blais
Thomas Anthony St.Gelais
Original Assignee
Husky Injection Molding Systems Ltd
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 Husky Injection Molding Systems Ltd filed Critical Husky Injection Molding Systems Ltd
Publication of WO2010138302A1 publication Critical patent/WO2010138302A1/fr

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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
    • 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
    • B29C2945/76177—Location of measurement
    • B29C2945/76314—Auxiliary devices
    • B29C2945/76334—Auxiliary devices auxiliary fluid supplying devices
    • 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
    • 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
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C45/281—Drive means therefor

Definitions

  • the present invention generally relates to a hot-runner system, used in a molding system, having a controller to determine movement of valve stems.
  • Examples of known molding systems are (amongst others): (i) the HyPET (TRADEMARK) Molding System, (ii) the Quadloc (TRADEMARK) Molding System, (iii) the Hylectric (TRADEMARK) Molding System, and (iv) the HyMet (TRADEMARK) Molding System, all manufactured by Husky Injection Molding Systems Limited (Location: Bolton, Ontario, Canada; www.husky.ca).
  • United States Patent Application Number 2004/0115295 discloses an injection molding apparatus having a linear actuator for a control valve with a position sensor and a cooling assembly, and the position sensor is integrated into or positioned proximal to the cooling assembly.
  • United States Patent Number 6746228 discloses an injection molding device including an actuating cylinder with a piston.
  • a valve pin is actuated by the cylinder.
  • the piston includes a fluid passage via which pressure medium can pass when the piston is in a position between its upper and its lower end position, and which is at least partly closed off when the piston is in its lower and/or its upper end position. Relatively simple position indicator of the valve pin is formed.
  • valve-gated hot-runner systems A major concern with valve-gated hot-runner systems is not being able to determine the current position of valve stems used in nozzle assemblies. Injecting hot melt for the case where the valve stems are not placed in a fully retracted position may have a negative impact on: (i) the balancing of melt distribution in the hot-runner system, (ii) part quality (that is, the part to be molded), and/or (iii) weepage of the hot melt.
  • valve stem actuation delay associated with pneumatically-actuated valve stems as well.
  • the aspects of the present invention allows for the detection of the motion and/or position of the valve stems, and this arrangement improves or maintains operation of a hot-runner system at an optimum performance, and helps to determine whether good parts are made/molded.
  • the aspects of the present invention can be used to inform the users of any changes associated with the processing conditions of the hot-runner system, and this arrangement provides: (i) early detection of bad parts, (ii) earlier detection of the degradation of performance of the hot-runner system, and (iii) an opportunity to schedule preventative maintenance before bad parts are made.
  • a general aspect of the invention provides a hot-runner system (100), including: valve stems (104) being movable between an opened position and a closed position; a pressurized- air circuit (108); an actuator assembly (106) being coupled with the valve stems (104), the actuator assembly (106) being actuatable via the pressurized-air circuit (108), so that the valve stems (104) are movable responsive to a change in pressurization in the pressurized-air circuit (108); a transducer assembly (110) being coupled with the pressurized-air circuit (108), the transducer assembly (110) being configured to provide an output signal indicating an amount of pressure in the pressurized-air circuit (108); and a controller (112) being coupled with the transducer assembly (110), and the controller (112) having a controller-usable medium (314) embodying instructions (316) being executable by the controller (112), the instructions (316) being configured to: direct the controller (112) to determine movement of the valve stems (104) based on the output signal provided by the
  • FIG. 1 depicts a hot-runner system 100 in accordance with a first non- limiting embodiment
  • FIG. 2 depicts an aspect of the hot-runner system 100 of FIG. 1
  • FIG. 3 depicts another aspect of the hot-runner system 100 of FIG. 1 ;
  • FIG. 4 depicts detection of a condition associated with the hot-runner system 100 of FIG. 1 ;
  • FIG. 5 depicts detection of another condition associated with the hot-runner system 100 of FIG. l;
  • FIG. 6 depicts an operation 200 of a controller 112 of the hot-runner system 100 of FIG. 1.
  • FIG. 1 depicts the hot-runner system 100, which is to be included with or used with a molding system (not depicted but known).
  • the hot-runner system 100 may include components that are known to persons skilled in the art, and these known components will not be described here; these known components are described, at least in part, in the following reference books, for example: (i) "Injection Molding Handbook” authored by OSSWALD/TURNG/GRAMANN (ISBN: 3-446- 21669-2), (ii) "Injection Molding Handbook” authored by ROSATO AND ROSATO (ISBN: 0-412- 99381-3), (iii) "Injection Molding Machines” 3rd Edition authored by JOHANNABER (ISBN 3- 446-17733-7) and/or (iv) "Runner and Gating Design Handbook” authored by BEAUMONT (ISBN 1-446-22672-9).
  • the hot-runner system 100 includes: valve stems 104, a pressurized- air circuit 108, an actuator assembly 106, a transducer assembly 110, and a controller 112. It will be appreciated that a single valve stem 104 is depicted in FIG. 1 for the sake of simplifying the description, and that there are in fact a plurality of valve stems used in the hot-runner system 100 of FIG. 1.
  • the valve stems 104 are movable between an opened position and a closed position.
  • the valve stems 104 are included in a nozzle assembly 114.
  • the hot-runner system 100 also includes: (i) a manifold assembly 116 that defines a melt pathway 118, and (ii) a mold-plate assembly 120 that is adjacent to the manifold assembly 116 (the mold-plate assembly 120 is connected with a mold assembly (not depicted but known) so that the nozzle assembly 114 may deliver hot melt to the mold cavity defined by the mold assembly.
  • the hot-runner system 100 also includes a backing-plate assembly 122 that is positioned adjacent to a backside of the manifold assembly 116.
  • the backing-plate assembly 122 defines a cooling circuit 124 that is used to convey a cooling fluid that removes excess heat from the backing-plate assembly 122.
  • the backing-plate assembly 122 and the mold-plate assembly 120 support the manifold assembly 116.
  • the pressurized- air circuit 108 is attached to an air-close circuit 136 and an air-close circuit 138, both of which are attached with an air-valve assembly 140 that is actuated by an actuation solenoid 142.
  • An example of the air-valve assembly 140 is a 4-way air-valve assembly.
  • An example of the 4- way air-valve assembly is the type manufactured by Numatics Inc., Model Number Mark 25 Valve Part Number 253SA43AK. It will be appreciated that the controller 112 is being used to monitor the status of the solenoid 142, and that the controller 112 does not have to control operation of the solenoid 142.
  • the backing-plate assembly 122 defines a cylinder bore 130.
  • the actuator assembly 106 includes an air cylinder 126 and a piston 128 that is slidably movable along the air cylinder 126.
  • a piston seal 132 seals the piston 128 against the air cylinder 126.
  • the cylinder bore 130 receives the air cylinder 126 and the piston 128.
  • the actuator assembly 106 is coupled with the valve stems 104.
  • the actuator assembly 106 is actuatable via the pressurized-air circuit 108, so that the valve stems 104 are movable responsive to a change in pressurization in the pressurized-air circuit 108.
  • the transducer assembly 110 is coupled with the pressurized-air circuit 108.
  • the transducer assembly 110 is configured to provide an output signal indicating an amount of pressure in the pressurized-air circuit 108.
  • the transducer assembly 110 includes an air-pressure transducer 134 or a plurality of air-pressure transducers 134.
  • FIG. 1 depicts two air-pressure transducers 134 are used.
  • An example the transducer assembly 110 is of the type manufactured by Omega Engineering, Inc., Model Number PX181B and Part Number PX181B-300G5V.
  • the controller 112 is coupled with the transducer assembly 110.
  • the controller 112 has a controller- usable medium 314 (such as a memory device, floppy disc, etc) tangibly embodying instructions 316 that are executable by the controller 112.
  • the instructions 316 are compiled from high level computer programmed instructions written in a computer programming language such as C++, etc. it will be appreciated to those skilled in the art that the operation 200 (depicted in FIG. 6) may be used as the basis for the design associated with the high level computer programmed instructions.
  • a suitable compiler as known to those skilled in the art, may be used to convert the computer programmed instructions into the instructions 316.
  • the instructions 316 are configured to direct the controller 112 to determine movement of the valve stems 104 based on the output signal provided by the transducer assembly 110.
  • the controller 112 includes: a digital-signal processor configured to process the output signal of the transducer assembly 110, and to: (i) determine a final movement of the last one of the valve stems 104 based on the output signal of the transducer assembly 110, and (ii) provide an output indication 144 (from the processor output 148 of the controller 112) indicating when the last one of the valve stems 104 has completed movement.
  • a digital-signal processor configured to process the output signal of the transducer assembly 110, and to: (i) determine a final movement of the last one of the valve stems 104 based on the output signal of the transducer assembly 110, and (ii) provide an output indication 144 (from the processor output 148 of the controller 112) indicating when the last one of the valve stems 104 has completed movement.
  • An example of the controller 112 is of the type manufactured by Labview or National Instruments.
  • FIG. 2 depicts an aspect of the hot-runner system 100 of FIG. 1.
  • FIG. 2 depicts an option for placement of the transducer assembly 110.
  • a first option is to mount the transducer assembly 110 at a location 170 on the air fitting 158 as close to the backing-plate assembly 122 as possible for optimum results.
  • the air-close circuit 136 is connected to the air- flow pathway 156 via the air fitting 158.
  • the flow of air through the air-flow pathway 156 is indicated by a flow direction arrow 160.
  • Plugs 150 are inserted into the air-flow pathway 156.
  • a dead spot 152 is located immediately behind the plug 150.
  • the length of the dead spot 152 is indicated as the dead length 154.
  • FIG. 3 depicts another aspect of the hot-runner system 100 of FIG. 1.
  • FIG. 3 depicts the options for placement of the transducer assembly 110.
  • a second option is a location 172, which is to mount the transducer assembly 110 in the cylinder bore 130 defined by the backing-plate assembly 122.
  • a third option is a location 174, which is to mount the transducer assembly 110 on the solenoid 142 for indirect sensing of air pressure in the air circuit.
  • a fourth option is a location 176, which is to mount the transducer assembly 110 in the air circuit, so that the air pressure inside the air circuit formed in the backing-plate assembly 122 can be sensed directly.
  • the transducer assembly 110 may be mounted: (i) anywhere between the solenoid and the backing-plate assembly 122, or (ii) in the backing-plate assembly 122.
  • another location would be to mount the transducer assembly 110 between the solenoid 142 and the backing-plate assembly 122 for indirect sensing of air pressure.
  • FIG. 4 depicts detection of a condition associated with the hot-runner system 100 of FIG. 1.
  • FIG. 4 depicts a plot or a graph 400 of the pressure increase for air flowing into the hot-runner system 100 to pressurize the bottom side of the piston 128 in order to move the valve stem.
  • the horizontal axis 402 represents time (in seconds), and the vertical axis 404 represents pressure (in psi - pounds per square inch).
  • a portion 406 of the graph 400 represents the pressure change associated with movement of the first valve stem.
  • a portion 408 of the graph 400 represents the pressure change associated with the movement of the last valve stem. As the pressure builds in the piston 128, the air reaches a pressure at which the piston 128 starts to move.
  • the volume increases at a rate equal to the volumetric flow rate of air flowing into the hot-runner system 100 (for purposed of valve stem actuation, the volume is the volume of air the respective open or closed circuit which includes the air in the backing-plate assembly 122, air lines between the solenoid and the backing-plate assembly 122).
  • the controller will record the time to either pressurize or de-pressurize the system. The time to pressure or de- pressurize is dependent on the system volume and air flow. Assuming constant air flow, if the volume changes (stuck stem open or closed), then there is a stuck stem. This logic is different than the logic used to detect the first stem moving and last stem moving.
  • the controller 112 (which may include a digital signal processor) detects: (i) the change in slope associated with movement of the first valve stem that is made to move, and (ii) the change in slope associated with the movement of the last valve stem that is made to move.
  • the instructions 316 are configured to: (i) direct the controller 112 to determine movement of the valve stems 104 based on a slope of the output signal provided by the transducer assembly 110, (ii) determine whether the valve stems 104 are in a fully-retracted condition the opened position based on the output signal provided by the transducer assembly 110, or (iii) determine when the last one of the valve stems 104 has moved to a predetermined position based on the output signal being by the transducer assembly 110.
  • FIG. 5 depicts detection of another condition associated with the hot-runner system 100 of FIG. 1.
  • a plot or a graph 500 represents close pressure (that is, a plot of the air pressure increase and the corresponding slope).
  • a graph 502 represents a differential slope.
  • the horizontal axis 504 represents time in seconds, and the vertical axis 506 represents pressure (in psi - pounds per square inch).
  • a portion 508 of the graph 500 represents the pressure change associated with movement of the first valve stem.
  • a portion 510 of the graph 500 represents the pressure change associated with the movement of the last valve stem.
  • the slope takes a dramatic step change when: (i) the first valve stem starts to move, and (ii) the last valve stem starts to move.
  • the controller 112 can detect when the first valve stem moves and when the last valve stem moves.
  • FIG. 6 depicts the operation 200 of a controller 112 of the hot-runner system 100 of FIG. 1.
  • the operation 200 is implemented in the instructions 316 that are to be executed by or performed by the controller 112 of FIG. 1.
  • the operation 200 includes operations 202 to 216.
  • the operation 202 includes monitoring the pressure.
  • the operation 204 includes determining whether the pressure starts increasing.
  • the operation 206 includes determining the occurrence of the first significant slope change for the movement of the first valve stem.
  • the operation 208 includes recording that the first stem has been moved.
  • the operation 210 includes determining the occurrence of the second significant slope change, and this is occurrence of the movement of the last valve stem to be moved.
  • the operation 212 includes recording the occurrence of when the last valve stem was moved.
  • the operation 214 provides an indication (such as a digital output 218 associated with the controller 112) indicating that the last valve stem has been placed into position.
  • the operation 216 includes comparing the first valve stem and the last valve stem to be move to the average, and if there is an error detected, then provide a report indicating "out of range”.
  • the operation 200 of the controller 112 provides a way of detecting the movement of the valve stems 104 and provides a signal (such as a processor output 148 (either digital or analog) that indicates (to the molding system for example) that the valve stems 104 are positioned in the fully retracted position.
  • the air-pressure transducers 134 are used with a controller 112 along with programmed instructions to implement the operation 200 to determine when the last valve stem has moved to the fully retracted position. Respective air- pressure transducers 134 is mounted to each fitting of an air circuit that enters the hot-runner system 100 (as depicted in FIG. 1), and the controller 112 is used to monitor the air circuit pressure and to determine when the last valve stem is in the fully retracted position.
  • the controller 112 is able to detect the following: (i) the start time of the movement of the valve stems 104, (ii) the stop time of the movement of valve stems 104, (iii) the variation over time, (iv) whether a valve stem is stuck in the closed position or in the open position.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention porte sur un système de canal chauffant (100), qui comprend : des tiges de soupape (104) aptes à se déplacer entre une position ouverte et une position fermée ; un circuit d'air comprimé (108) ; un ensemble actionneur (106) qui est couplé aux tiges de soupape (104), l'ensemble actionneur (106) pouvant être actionné par l'intermédiaire d'un circuit d'air comprimé (108), de telle sorte que les tiges de soupape (104) sont mobiles en réponse à un changement de compression dans le circuit d'air comprimé (108) ; un ensemble transducteur (110) qui est couplé au circuit d'air comprimé (108), l'ensemble transducteur (110) étant configuré de façon à délivrer un signal de sortie indiquant une quantité de pression dans le circuit d'air comprimé (108) ; et un dispositif de commande (112) qui est couplé à l'ensemble transducteur (110), le dispositif de commande (112) ayant un milieu utilisable par le dispositif de commande (314) mettant en œuvre des instructions (316) qui sont exécutables par le dispositif de commande (112), les instructions (316) étant configurées pour : ordonner au dispositif de commande (112) de déterminer un mouvement des tiges de soupape (104) en fonction d'un signal de sortie délivré par l'ensemble transducteur (110).
PCT/US2010/034461 2009-05-28 2010-05-12 Système de canal chauffant ayant un dispositif de commande pour déterminer le mouvement de tiges de soupape WO2010138302A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18178709P 2009-05-28 2009-05-28
US61/181,787 2009-05-28

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WO2010138302A1 true WO2010138302A1 (fr) 2010-12-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013109515A1 (fr) * 2012-01-17 2013-07-25 Husky Injection Molding Systems Ltd. Système d'outil de moulage incluant un ensemble d'actionneur de tige configuré pour exercer un mouvement contrôlé de l'ensemble de tige de soupape
AT515780A4 (de) * 2014-06-16 2015-12-15 Engel Austria Gmbh Verfahren zum Überwachen der Bewegung einer Kolben-Zylinder-Einheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6228309B1 (en) * 1998-12-22 2001-05-08 Husky Injection Molding Systems Ltd. Method and apparatus for injection molding including valve stem positioning
US6767486B2 (en) * 1998-04-21 2004-07-27 Synventive Molding Solutions, Inc. Controlled injection using manifold having multiple feed channels
US20070224303A1 (en) * 1999-09-21 2007-09-27 Synventive Molding Solutions, Inc. Injection molding flow control apparatus and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6767486B2 (en) * 1998-04-21 2004-07-27 Synventive Molding Solutions, Inc. Controlled injection using manifold having multiple feed channels
US6228309B1 (en) * 1998-12-22 2001-05-08 Husky Injection Molding Systems Ltd. Method and apparatus for injection molding including valve stem positioning
US20070224303A1 (en) * 1999-09-21 2007-09-27 Synventive Molding Solutions, Inc. Injection molding flow control apparatus and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013109515A1 (fr) * 2012-01-17 2013-07-25 Husky Injection Molding Systems Ltd. Système d'outil de moulage incluant un ensemble d'actionneur de tige configuré pour exercer un mouvement contrôlé de l'ensemble de tige de soupape
AT515780A4 (de) * 2014-06-16 2015-12-15 Engel Austria Gmbh Verfahren zum Überwachen der Bewegung einer Kolben-Zylinder-Einheit
AT515780B1 (de) * 2014-06-16 2015-12-15 Engel Austria Gmbh Verfahren zum Überwachen der Bewegung einer Kolben-Zylinder-Einheit
DE102015007568A1 (de) 2014-06-16 2015-12-17 Engel Austria Gmbh Verfahren zum Überwachen der Bewegung einer Kolbenzylindereinheit

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