WO2007028270A1 - Internal thread demoulding by expulsion - Google Patents
Internal thread demoulding by expulsion Download PDFInfo
- Publication number
- WO2007028270A1 WO2007028270A1 PCT/CH2006/000480 CH2006000480W WO2007028270A1 WO 2007028270 A1 WO2007028270 A1 WO 2007028270A1 CH 2006000480 W CH2006000480 W CH 2006000480W WO 2007028270 A1 WO2007028270 A1 WO 2007028270A1
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- WO
- WIPO (PCT)
- Prior art keywords
- core
- mold
- internal thread
- plastic
- thread
- 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.)
- Ceased
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Classifications
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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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0003—Discharging moulded articles from the mould
- B29C37/0017—Discharging moulded articles from the mould by stripping articles from mould cores
- B29C37/0021—Discharging moulded articles from the mould by stripping articles from mould cores and using a rotating movement to unscrew articles
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/442—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor
- B29C33/444—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor for stripping articles from a mould core, e.g. using stripper plates
- B29C33/446—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor for stripping articles from a mould core, e.g. using stripper plates and using a rotating movement to unscrew articles
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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
- B29C45/26—Moulds
- B29C45/2618—Moulds having screw-threaded mould walls
Definitions
- the present invention relates to a method and a device for producing an injection-molded element, in particular an object having an internal thread, in particular for producing a suitable for an injection device or a pen threaded sleeve, preferably made of plastic, with an axially at least over a part of the sleeve extending Inner thread.
- a plastic sleeve with an internal thread can be produced, for example, by means of a boring tool, wherein the internal thread to be formed on the inside of the plastic sleeve is designed as an external thread on a steel core which is actively rotated out of the plastic sleeve formed around the steel core.
- the steel core is rotated by a gear from the plastic part.
- Another known method for producing an internal thread in a plastic sleeve is demolding by means of a drop core.
- the drop core collapses during demolding and thus releases the thread, so that the plastic sleeve can be removed with a molded internal thread.
- the collapse segments are separated by fixed central webs, so that the undercuts or threads on the molded part also have an interruption.
- the forced removal of a thread is known, which is mainly used in closure lids in beverage bottles, wherein the molded plastic part with internal thread must be stretchable to allow the forced removal of the thread.
- the inventive device for producing a molded part or object having an internal thread has a molding tool in which the object can be formed, for example, by injection molding in an object mold cavity and according to the invention has a core with an external thread, with which the internal thread of the object or of the plastic sleeve can be formed by injecting the core, which can be pulled out at least in part axially and without rotation relative to the molding tool.
- a relative axial movement between the core and the object formed in the mold is made possible, so that the rotatably or non-rotatably mounted in the mold tapping core can be pulled out axially with or without rotation or rotation relative to the mold from this.
- the threaded sleeve formed around the thread forming core is repelled by the thread forming core and rotated relative to the core or mold when the thread forming core is withdrawn from the forming tool.
- the tapping core is positively connected to the mold and advantageously mounted axially displaceable against rotation in the mold, so that a precise radial positioning of the thread relative to the outer contour of the molded part is possible.
- the molds for producing the molded part with internal thread can be simpler constructed and thus manufactured cheaper, especially if multiple mold cavities are used in Mehrkavticianentechnikmaschinen, since only an axial relative movement between the core and ejector sleeve all molds is required and eliminates a rotary drive of the core can.
- the manufacturing device has an ejector and in particular a rotatably mounted on the mold ejector sleeve, which adjoins the space for forming the molded part and this limited and preferably rotatably mounted on or in a mold plate of the mold, so that the displaceable preferably in the ejector stored core through the ejector eg can be pulled out without relative movement to the mold and thus offset by pulling out the external thread of the core of the internal thread of the threaded sleeve in a rotation relative to the mold, which transmits to the voltage applied to the molding ejector sleeve.
- the outer thread of the core preferably has a pitch of 30 to 60 ° and may be in the range of 40 to 50 °, so that a molded around the core threaded sleeve with an internal thread with a corresponding pitch allows axial extraction of the core of the threaded sleeve, the means there is no self-locking of the external thread on the core with the internal thread of eg formed by injection molding threaded sleeve.
- the coefficient of friction, thread form, flank angle and radii of the thread or the threaded sleeve and the core should be formed so that no self-locking occurs.
- the mold consists of at least two mold plates, such as a nozzle-side mold plate and an ejector-side mold plate, wherein the nozzle-side mold plate is removed after injection of the plastic together with a provided in the nozzle-side mold plate core to the formed in the mold at least an object, so one or more threaded sleeves to expose, whereupon the cores located in the threaded sleeves are preferably simultaneously withdrawn axially from the threaded sleeve or sleeves and the threaded sleeves can be removed from the mold or fall down from this.
- the core has a coating which reduces the friction between the core and the molded plastic and / or the ejector sleeve, such as a nickel-Teflon coating.
- the device described above is designed so that a plurality of threaded sleeves can be formed simultaneously by, for example, a plurality of mold cavities are provided side by side, wherein the individual mold cavities associated nuclei are preferably connected to each other so that they simultaneously by an axial movement of the shaped objects out and at least partially pulled out of the respective ejector sleeves.
- Several cores can be side by side, e.g. be fixed and secured against rotation or rotatably mounted in or on a plate, which is moved relative to the mold to demoulding three mold-free multiple mold objects.
- the invention relates to a method for producing an object having an internal thread, in particular a threaded sleeve for an injection device, wherein the object is replaced by an injection process by supplying plastic, such as e.g. a polymer, for example polyoxymethylene (POM) or polycarbonate, is formed into a mold cavity at least partially or completely around a male-threaded core and wherein the core is pulled out of the object by an axial relative movement, ie preferably not or only slightly when pulled out is turned.
- plastic such as e.g. a polymer, for example polyoxymethylene (POM) or polycarbonate
- POM polyoxymethylene
- the core is pulled out of the object by an axial relative movement, ie preferably not or only slightly when pulled out is turned.
- the formed object and / or the core can be placed in a rotation relative to the mold, which can be transmitted to a fitting on the object ejector, which is rotatably supported by a bearing in the mold.
- Figure 1 is a cross-sectional view of the injection molding apparatus according to the invention along the section AA in Figure 2;
- Figure 2 is a plan view of the injection molding apparatus shown in Figure 1;
- Figure 3 is a side view of an inventively designed threaded sleeve;
- Figure 4 is a plan view of the sleeve shown in Figure 3;
- Figure 5 is a sectional view taken along the line A-A in Figure 4.
- FIG. 6 shows a sectional view along the line B-B in FIG. 5.
- Figure 2 shows in plan view an embodiment of an injection molding tool, which is shown in a sectional view taken along the line A-A in Figure 1.
- An ejector-side mold plate 2 has an e.g. guided by a groove against rotation in the mold plate 2 mounted axially pushed out of the mold plate 2 and mounted in an ejector 4 core 3 with an external thread 3a.
- the core 3 is coated with a low coefficient of friction material, such as a nickel-Teflon coating, and may be supported by the bearing 6, consisting of the rear bearing disk 6a, the rear bearing 6b, the front bearing disk 6c and the front bearing 6d relative to the mold plate 2 rotatably mounted ejector sleeve 4 in the direction shown by the arrow P after the formation of the threaded sleeve 5 in the form of the ejector-side mold plate 2, the nozzle-side mold plate 1, the ejector 4, the front of the core 3 and the core shape 3b defining the thread shape be pulled out, so that the threaded sleeve 5 is released externally after injection of the plastic in the mold cavity through the injection port Ia and the axial driving away of the nozzle-side mold plate 1 and can be dropped.
- a low coefficient of friction material such as a nickel-Teflon coating
- the core 3 can simply be axially re-inserted into the ejector-side mold plate 2 and the nozzle-side mold plate 1 are placed on the ejector-side mold plate 2 to to produce a further threaded sleeve 5.
- mold plate 2 In the mold plate 2 is an exception 2a for a dynamometer, such as. a load cell, designed to monitor the manufacturing process.
- a dynamometer such as. a load cell
- FIG. 3 shows a side view of an embodiment of a threaded sleeve 5 producible according to the invention, which is shown in plan view in FIG.
- FIG. 5 shows a sectional view along the line AA of FIG. 4, wherein the internal thread 5b of the threaded sleeve 5 can be seen, which with the method according to the invention is relatively simple in a defined positional relationship to the outer contour, ie for example relative to those on the lower peripheral side of the threaded sleeve 5 provided cam 5a can be formed.
- Fig. 6 shows a sectional view along the line B-B in Figure 5, wherein the formed as a movement or trapezoidal thread internal thread 5b can be seen.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Innengewindeentformuag durch Abstoßen Internal thread release by pushing off
Die vorliegende Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Herstellung eines Spritzgußelements, insbesondere eines Objektes mit Innengewinde, insbesondere zur Herstellung einer für eine Injektionsvorrichtung oder einen Pen geeigneten Gewindehülse, bevorzugt aus Kunststoff, mit einem sich axial zumindest über einen Teil der Hülse erstreckenden Innengewinde.The present invention relates to a method and a device for producing an injection-molded element, in particular an object having an internal thread, in particular for producing a suitable for an injection device or a pen threaded sleeve, preferably made of plastic, with an axially at least over a part of the sleeve extending Inner thread.
Zur Erzeugung eines Innengewindes einer Kunststoffhülse im Spritzgussverfahren sind verschiedene Produktionskonzepte bekannt.To produce an internal thread of a plastic sleeve by injection molding various production concepts are known.
Eine Kunststoffhülse mit Innengewinde kann zum Beispiel mittels eines Ausdrehwerkzeuges hergestellt werden, wobei das auf der Innenseite der Kunststoffhülse, auszubildende Innengewinde als Außengewinde auf einem Stahlkern ausgebildet ist, welcher aktiv aus der um den Stahlkern herum ausgeformten Kunststoffhülse herausgedreht wird. Dabei wird der Stahlkern durch ein Getriebe aus dem Kunststoffteil gedreht.A plastic sleeve with an internal thread can be produced, for example, by means of a boring tool, wherein the internal thread to be formed on the inside of the plastic sleeve is designed as an external thread on a steel core which is actively rotated out of the plastic sleeve formed around the steel core. The steel core is rotated by a gear from the plastic part.
Ein weiteres bekanntes Verfahren zur Erzeugung eines Innengewindes in einer Kunststoffhülse ist die Entformung mittels eines Fallkerns. Dabei fällt der Fallkern beim Entformen in sich zusammen und gibt somit das Gewinde frei, so dass die Kunststoffhülse mit ausgeformtem Innengewinde entnommen werden kann. Bei kleineren Fallkernen sind die Zusammenfallsegmente durch feste Mittelstege getrennt, so dass die Hinterschneidungen oder Gewinde am Formteil auch eine Unterbrechung aufweisen. Weiterhin ist die Zwangsentformung eines Gewindes bekannt, welche vor allem bei Verschlussdeckeln bei Getränkeflaschen eingesetzt wird, wobei das geformte Kunststoffteil mit Innengewinde dehnbar sein muss, um die Zwangsentformung des Gewindes zu ermöglichen.Another known method for producing an internal thread in a plastic sleeve is demolding by means of a drop core. In this case, the drop core collapses during demolding and thus releases the thread, so that the plastic sleeve can be removed with a molded internal thread. For smaller case cores, the collapse segments are separated by fixed central webs, so that the undercuts or threads on the molded part also have an interruption. Furthermore, the forced removal of a thread is known, which is mainly used in closure lids in beverage bottles, wherein the molded plastic part with internal thread must be stretchable to allow the forced removal of the thread.
Es ist eine Aufgabe der vorliegenden Erfindung ein Verfahren und eine Vorrichtung zur Herstellung eines Objekts, insbesondere einer Hülse, welche bevorzugt aus Kunststoff geformt ist, mit einem Innengewinde vorzuschlagen, welche das präzise und kostengünstige Herstellen der Objekte oder Kunststoffhülsen ermöglichen.It is an object of the present invention to provide a method and an apparatus for producing an object, in particular a sleeve, which is preferably formed from plastic, with an internal thread, which allow the precise and cost-effective production of the objects or plastic sleeves.
Diese Aufgabe wird durch die Vorrichtung und das Verfahren gemäß den unabhängigen Patentansprüchen gelöst. Vorteilhafte Ausführungsformen ergeben sich aus den abhängigen Ansprüchen.This object is achieved by the device and the method according to the independent patent claims. Advantageous embodiments will be apparent from the dependent claims.
Die erfindungsgemäße Vorrichtung zur Herstellung eines Formteils oder Objektes mit Innengewinde, insbesondere einer Gewindehülse für eine Injektionsvorrichtung, weist ein Formwerkzeug auf, in welchem das Objekt zum Beispiel durch Spritzguss in einem Objektformraum ausgebildet werden kann und weist erfindungsgemäß einen Kern mit einem Außengewinde auf, mit welchem das Innengewinde des Objektes oder der Kunststoffhülse durch Um- spritzen des Kerns ausgebildet werden kann, welcher zumindest zum Teil axial und drehan- triebsfrei relativ zum Formwerkzeug herausgezogen werden kann. Hierdurch wird eine relative axiale Bewegung zwischen dem Kern und dem in dem Formwerkzeug ausgebildeten Objekt ermöglicht, so dass der drehbar oder verdrehsicher im Formwerkzeug gelagerte Gewindeformkern axial mit oder ohne Rotation oder Drehung relativ zum Formwerkzeug aus diesem herausgezogen werden kann. Hierdurch wird die um den Gewindeformkern ausgebildete Gewindehülse vom Gewindeformkern abgestoßen und relativ zum Kern oder auch Formwerkzeug in Drehung versetzt, wenn der Gewindeformkern aus dem Formwerkzeug herausgezogen wird.The inventive device for producing a molded part or object having an internal thread, in particular a threaded sleeve for an injection device, has a molding tool in which the object can be formed, for example, by injection molding in an object mold cavity and according to the invention has a core with an external thread, with which the internal thread of the object or of the plastic sleeve can be formed by injecting the core, which can be pulled out at least in part axially and without rotation relative to the molding tool. As a result, a relative axial movement between the core and the object formed in the mold is made possible, so that the rotatably or non-rotatably mounted in the mold tapping core can be pulled out axially with or without rotation or rotation relative to the mold from this. As a result, the threaded sleeve formed around the thread forming core is repelled by the thread forming core and rotated relative to the core or mold when the thread forming core is withdrawn from the forming tool.
Vorzugsweise ist der Gewindeformkern mit dem Formwerkzeug formschlüssig verbunden und vorteilhaft verdrehsicher in dem Formwerkzeug axial verschiebbar gelagert, so dass eine präzise radiale Positionierung des Gewindes relativ zur Außenkontur des Formteiles möglich ist. Durch das Wegfallen der Ausdrehgeräte können die Formwerkzeuge zur Herstellung des Formteils mit Innengewinde einfacher aufgebaut und somit günstiger hergestellt werden, insbesondere wenn mehrere Formnester bei Mehrkavitätenwerkzeugen verwendet werden, da lediglich eine axiale Relativbewegung zwischen Kern und Auswerferhülse aller Formwerkzeuge erforderlich ist und ein Drehantrieb des Kerns entfallen kann.Preferably, the tapping core is positively connected to the mold and advantageously mounted axially displaceable against rotation in the mold, so that a precise radial positioning of the thread relative to the outer contour of the molded part is possible. By eliminating the Ausdrehgeräte the molds for producing the molded part with internal thread can be simpler constructed and thus manufactured cheaper, especially if multiple mold cavities are used in Mehrkavitätenwerkzeugen, since only an axial relative movement between the core and ejector sleeve all molds is required and eliminates a rotary drive of the core can.
Vorzugsweise weist die Herstellungsvorrichtung einen Auswerfer und insbesondere eine drehbar am Formwerkzeug gelagerte Auswerferhülse auf, welche sich an den Raum zur Ausbildung des Formteiles anschließt und diesen begrenzt und bevorzugt drehbar an oder in einer Formplatte des Formwerkzeugs gelagert ist, so dass der vorzugsweise in dem Auswerfer verschiebbar gelagerte Kern durch den Auswerfer z.B. ohne Relativbewegung zum Formwerkzeug herausgezogen werden kann und somit durch das Herausziehen des Außengewindes des Kerns aus dem Innengewinde der Gewindehülse diese in eine Drehung relativ zum Formwerkzeug versetzt, welche sich auf die an dem Formteil anliegende Auswerferhülse überträgt.Preferably, the manufacturing device has an ejector and in particular a rotatably mounted on the mold ejector sleeve, which adjoins the space for forming the molded part and this limited and preferably rotatably mounted on or in a mold plate of the mold, so that the displaceable preferably in the ejector stored core through the ejector eg can be pulled out without relative movement to the mold and thus offset by pulling out the external thread of the core of the internal thread of the threaded sleeve in a rotation relative to the mold, which transmits to the voltage applied to the molding ejector sleeve.
Das Außengewinde des Kerns hat vorzugsweise eine Steigung von 30 bis 60° und kann im Bereich von 40 bis 50° liegen, so dass eine um den Kern herum ausgeformte Gewindehülse mit einem Innengewinde mit korrespondierender Steigung ein axiales Herausziehen des Kerns aus der Gewindehülse ermöglicht, das heißt es tritt keine Selbsthemmung des Außengewindes am Kern mit dem Innengewinde der z.B. durch Spritzguß ausgeformten Gewindehülse auf. Allgemein sollten Reibzahl, Gewindeform, Flankenwinkel und Radien des Gewindes bzw. der Gewindehülse und des Kerns so ausgebildet werden, dass keine Selbsthemmung auftritt.The outer thread of the core preferably has a pitch of 30 to 60 ° and may be in the range of 40 to 50 °, so that a molded around the core threaded sleeve with an internal thread with a corresponding pitch allows axial extraction of the core of the threaded sleeve, the means there is no self-locking of the external thread on the core with the internal thread of eg formed by injection molding threaded sleeve. In general, the coefficient of friction, thread form, flank angle and radii of the thread or the threaded sleeve and the core should be formed so that no self-locking occurs.
Vorteilhaft besteht das Formwerkzeug aus mindestens zwei Formplatten, wie zum Beispiel einer düsenseitigen Formplatte und einer auswerferseitigen Formplatte, wobei die düsenseiti- ge Formplatte nach dem Einspritzen des Kunststoffes zusammen mit einem in der düsenseitigen Formplatte vorgesehenen Kernabschluss abgenommen wird, um das in dem Formwerkzeug ausgebildete mindestens eine Objekt, also eine oder mehrere Gewindehülsen, freizulegen, woraufhin die in den Gewindehülsen befindlichen Kerne vorzugsweise gleichzeitig axial aus der oder den Gewindehülsen herausgezogen werden und die Gewindehülsen so aus dem Formwerkzeug herausgenommen werden können bzw. von diesem herunterfallen. Vorzugsweise weist der Kern eine Beschichtung auf, welche die Reibung zwischen dem Kern und dem ausgeformten Kunststoff und / oder der Auswerferhülse verringert, wie zum Beispiel eine Nickel-Teflon-Beschichtung.Advantageously, the mold consists of at least two mold plates, such as a nozzle-side mold plate and an ejector-side mold plate, wherein the nozzle-side mold plate is removed after injection of the plastic together with a provided in the nozzle-side mold plate core to the formed in the mold at least an object, so one or more threaded sleeves to expose, whereupon the cores located in the threaded sleeves are preferably simultaneously withdrawn axially from the threaded sleeve or sleeves and the threaded sleeves can be removed from the mold or fall down from this. Preferably, the core has a coating which reduces the friction between the core and the molded plastic and / or the ejector sleeve, such as a nickel-Teflon coating.
Vorteilhaft ist die oben beschriebene Vorrichtung so ausgebildet, dass mehrere Gewindehülsen gleichzeitig geformt werden können, indem zum Beispiel mehrere Formnester nebeneinander vorgesehen sind, wobei die den einzelnen Formnestern zugeordneten Kerne vorzugsweise so miteinander verbunden sind, dass diese gleichzeitig durch eine axiale Bewegung aus den geformten Objekten heraus und zumindest zum Teil aus den jeweiligen Auswerferhülsen herausgezogen werden. Dabei können mehrere Kerne nebeneinander z.B. fest und verdrehsicher oder drehbar gelagert in oder auf einer Platte vorgesehen sein, welche relativ zum Formwerkzeug bewegt wird, um drehantriebsfrei mehrere Formobjekte zu entformen.Advantageously, the device described above is designed so that a plurality of threaded sleeves can be formed simultaneously by, for example, a plurality of mold cavities are provided side by side, wherein the individual mold cavities associated nuclei are preferably connected to each other so that they simultaneously by an axial movement of the shaped objects out and at least partially pulled out of the respective ejector sleeves. Several cores can be side by side, e.g. be fixed and secured against rotation or rotatably mounted in or on a plate, which is moved relative to the mold to demoulding three mold-free multiple mold objects.
Gemäß einem weiteren Aspekt bezieht sich die Erfindung auf ein Verfahren zum Herstellen eines Objektes mit einem Innengewinde, insbesondere einer Gewindehülse für eine Injektionsvorrichtung, wobei das Objekt durch einen Einspritzprozess durch Zuführen von Kunststoff, wie z.B. ein Polymer, beispielsweise Polyoxymethylen (POM) oder Polycarbonat, in einen Formraum zumindest zum Teil oder vollständig um einen Kern mit Außengewinde herum ausgebildet wird und wobei der Kern durch eine axiale Relativbewegung aus dem Objekt drehantriebsfrei herausgezogen wird, also vorzugsweise nicht oder nur geringfügig beim Herausziehen gedreht wird. Dabei kann das ausgebildete Objekt und / oder auch der Kern in eine Drehung relativ zum Formwerkzeug versetzt werden, welche sich auf eine an dem Objekt anliegende Auswerferhülse, die mittels eines Lagers drehbar in dem Formwerkzeug gelagert ist, übertragen kann.According to a further aspect, the invention relates to a method for producing an object having an internal thread, in particular a threaded sleeve for an injection device, wherein the object is replaced by an injection process by supplying plastic, such as e.g. a polymer, for example polyoxymethylene (POM) or polycarbonate, is formed into a mold cavity at least partially or completely around a male-threaded core and wherein the core is pulled out of the object by an axial relative movement, ie preferably not or only slightly when pulled out is turned. In this case, the formed object and / or the core can be placed in a rotation relative to the mold, which can be transmitted to a fitting on the object ejector, which is rotatably supported by a bearing in the mold.
Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels beschrieben. Es zeigen:The invention will be described below with reference to a preferred embodiment. Show it:
Figur 1 eine Querschnittsansicht der erfindungsgemäßen Spritzgussvorrichtung entlang dem Schnitt A-A in Figur 2; Figur 2 eine Draufsicht auf die in Figur 1 gezeigte Spritzgussvorrichtung; Figur 3 eine Seitenansicht einer erfindungsgemäß ausgebildeten Gewindehülse;Figure 1 is a cross-sectional view of the injection molding apparatus according to the invention along the section AA in Figure 2; Figure 2 is a plan view of the injection molding apparatus shown in Figure 1; Figure 3 is a side view of an inventively designed threaded sleeve;
Figur 4 eine Draufsicht auf die in Figur 3 gezeigte Hülse;Figure 4 is a plan view of the sleeve shown in Figure 3;
Figur 5 eine Schnittansicht entlang der Linie A-A in Figur 4; undFigure 5 is a sectional view taken along the line A-A in Figure 4; and
Figur 6 eine Schnittansicht entlang der Linie B-B in Figur 5.FIG. 6 shows a sectional view along the line B-B in FIG. 5.
Figur 2 zeigt in Draufsicht eine Ausführungsform eines Spritzgusswerkzeuges, welches in einer Schnittansicht entlang der Linie A-A in Figur 1 gezeigt ist. Eine auswerferseitige Formplatte 2 weist einen z.B. durch eine Nut geführten verdrehsicher in der Formplatte 2 gelagerten axial aus der Formplatte 2 herausschiebbaren und in einer Auswerferhülse 4 gelagerten Kern 3 mit einem Außengewinde 3a auf. Der Kern 3 ist mit einem Material mit niedrigem Reibungskoeffizienten beschichtet, wie zum Beispiel einer Nickel-Teflon-Beschichtung und kann durch die auf dem Lager 6, bestehend aus hinterer Lagerscheibe 6a, hinterem Lager 6b, vorderer Lagerscheibe 6c und vorderem Lager 6d relativ zur Formplatte 2 drehbar gelagerte Auswerferhülse 4 in der durch den Pfeil P dargestellten Richtung nach dem Ausbilden der Gewindehülse 5 in dem durch die auswerferseitige Formplatte 2, die düsenseitige Formplatte 1, die Auswerferhülse 4, die Vorderseite des Kerns 3 und den die Gewindeform bestimmenden Kernabschluß 3b gebildeten Formraum herausgezogen werden, so dass die Gewindehülse 5 nach dem Einspritzen des Kunststoffes in den Formraum durch die Einspritzöffnung Ia und dem axialen Wegfahren der düsenseitigen Formplatte 1 außen freigestellt ist und abgeworfen werden kann.Figure 2 shows in plan view an embodiment of an injection molding tool, which is shown in a sectional view taken along the line A-A in Figure 1. An ejector-side mold plate 2 has an e.g. guided by a groove against rotation in the mold plate 2 mounted axially pushed out of the mold plate 2 and mounted in an ejector 4 core 3 with an external thread 3a. The core 3 is coated with a low coefficient of friction material, such as a nickel-Teflon coating, and may be supported by the bearing 6, consisting of the rear bearing disk 6a, the rear bearing 6b, the front bearing disk 6c and the front bearing 6d relative to the mold plate 2 rotatably mounted ejector sleeve 4 in the direction shown by the arrow P after the formation of the threaded sleeve 5 in the form of the ejector-side mold plate 2, the nozzle-side mold plate 1, the ejector 4, the front of the core 3 and the core shape 3b defining the thread shape be pulled out, so that the threaded sleeve 5 is released externally after injection of the plastic in the mold cavity through the injection port Ia and the axial driving away of the nozzle-side mold plate 1 and can be dropped.
Nachdem der Kern 3 axial aus der auswerferseitigen Formplatte 2 herausgezogen wurde und die Gewindehülse 5 aus dem Formwerkzeug herausgelöst wurde, kann der Kern 3 einfach axial wieder in die auswerferseitige Formplatte 2 eingeschoben werden und die düsenseitige Formplatte 1 auf die auswerferseitige Formplatte 2 aufgesetzt werden, um eine weitere Gewindehülse 5 herzustellen.After the core 3 has been pulled out axially from the ejector-side mold plate 2 and the threaded sleeve 5 has been removed from the mold, the core 3 can simply be axially re-inserted into the ejector-side mold plate 2 and the nozzle-side mold plate 1 are placed on the ejector-side mold plate 2 to to produce a further threaded sleeve 5.
In der Formplatte 2 ist eine Ausnahme 2a für einen Kraftmesser, wie z.B. eine Kraftmeßdose, zur Überwachung der Herstellungsverfahrens vorgesehen.In the mold plate 2 is an exception 2a for a dynamometer, such as. a load cell, designed to monitor the manufacturing process.
Figur 3 zeigt eine Seitenansicht einer Ausführungsform einer erfindungsgemäß herstellbaren Gewindehülse 5, welche in Draufsicht in Figur 4 gezeigt ist. Figur 5 zeigt eine Schnittansicht entlang der Linie A-A der Figur 4, wobei das Innengewinde 5b der Gewindehülse 5 erkennbar ist, welches mit dem erfindungsgemäßen Verfahren relativ einfach in einem definierten Lageverhältnis zur Außenkontur, also zum Beispiel relativ zu den an der unteren Umfangsseite der Gewindehülse 5 vorgesehenen Nocken 5a ausgebildet werden kann.FIG. 3 shows a side view of an embodiment of a threaded sleeve 5 producible according to the invention, which is shown in plan view in FIG. FIG. 5 shows a sectional view along the line AA of FIG. 4, wherein the internal thread 5b of the threaded sleeve 5 can be seen, which with the method according to the invention is relatively simple in a defined positional relationship to the outer contour, ie for example relative to those on the lower peripheral side of the threaded sleeve 5 provided cam 5a can be formed.
Fig. 6 zeigt eine Schnittansicht entlang der Linie B-B in Figur 5, wobei das als Bewegungsoder Trapezgewinde ausgeformte Innengewinde 5b erkennbar ist.Fig. 6 shows a sectional view along the line B-B in Figure 5, wherein the formed as a movement or trapezoidal thread internal thread 5b can be seen.
Die in den Figuren 4, 5 und 6 gezeigten Maßangaben sind Teil der erfindungsgemäßen Lehre und spezifizieren nur eine Ausführungsform einer erfindungsgemäß herstellbaren Gewindehülse 5, ohne jedoch die Herstellung von Gewindehülsen mit anderen Maßangaben oder Dimensionen von dieser Erfindung auszuschließen. The dimensions shown in Figures 4, 5 and 6 are part of the teaching of the invention and specify only one embodiment of an inventively produced threaded sleeve 5, but without excluding the production of threaded sleeves with other dimensions or dimensions of this invention.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200510042758 DE102005042758B3 (en) | 2005-09-08 | 2005-09-08 | Device and method for producing an object with internal thread |
| DE102005042758.8 | 2005-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007028270A1 true WO2007028270A1 (en) | 2007-03-15 |
Family
ID=37330003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CH2006/000480 Ceased WO2007028270A1 (en) | 2005-09-08 | 2006-09-08 | Internal thread demoulding by expulsion |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102005042758B3 (en) |
| WO (1) | WO2007028270A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112338177A (en) * | 2020-10-28 | 2021-02-09 | 京山翼龙铸钢有限公司 | Tool for solving difficulty in stripping of movable material of steel casting die |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160214283A1 (en) * | 2015-01-26 | 2016-07-28 | General Electric Company | Composite tool and method for forming composite components |
| DE102020122372B3 (en) | 2020-08-27 | 2022-01-13 | Schaeffler Technologies AG & Co. KG | Plastic part with an internal thread and method for producing a plastic part |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3150222A (en) * | 1961-05-16 | 1964-09-22 | Phillips Petroleum Co | Molding threaded articles |
| WO1996026058A1 (en) * | 1995-02-23 | 1996-08-29 | James Skufca | Mold apparatus for helical articles |
| GB2349602A (en) * | 1999-02-26 | 2000-11-08 | Unique Mould Makers Ltd | Ejecting threaded injection moulded parts by a rotational and axial movement |
| US20010036382A1 (en) * | 1995-05-24 | 2001-11-01 | Werner Lang | Production of releasably secured sleeve elements |
| US20030075831A1 (en) * | 2001-10-24 | 2003-04-24 | Venus Donald W. | Apparatus for producing fastener assembly with molded internal helical flutes |
-
2005
- 2005-09-08 DE DE200510042758 patent/DE102005042758B3/en not_active Expired - Fee Related
-
2006
- 2006-09-08 WO PCT/CH2006/000480 patent/WO2007028270A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3150222A (en) * | 1961-05-16 | 1964-09-22 | Phillips Petroleum Co | Molding threaded articles |
| WO1996026058A1 (en) * | 1995-02-23 | 1996-08-29 | James Skufca | Mold apparatus for helical articles |
| US20010036382A1 (en) * | 1995-05-24 | 2001-11-01 | Werner Lang | Production of releasably secured sleeve elements |
| GB2349602A (en) * | 1999-02-26 | 2000-11-08 | Unique Mould Makers Ltd | Ejecting threaded injection moulded parts by a rotational and axial movement |
| US20030075831A1 (en) * | 2001-10-24 | 2003-04-24 | Venus Donald W. | Apparatus for producing fastener assembly with molded internal helical flutes |
Non-Patent Citations (1)
| Title |
|---|
| SCHNEE W ET AL: "STEILGEWINDE-SPINDELN MIT MUTTERN FUER SPRITZGUSSWERKZEUGE MIT GEWINDEAUSDREHVORRICHTUNG THREADED SPINDLES OF HIGH HELIX ANGLE COMPLETE WITH NUTS FOR MOULDS WITH THREADED EXTRACTORS IN INJECTION-MOULDING MACHINES VIS A PAS RAPIDE AVEC ECROUS POUR MOULD", KUNSTSTOFFTECHNIK, KRAUKOPF VERLAG FUER WIRTSCHAFT, MAINZ, DE, vol. 9, no. 12, December 1970 (1970-12-01), pages 433 - 434, XP001176306, ISSN: 0023-5601 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112338177A (en) * | 2020-10-28 | 2021-02-09 | 京山翼龙铸钢有限公司 | Tool for solving difficulty in stripping of movable material of steel casting die |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005042758B3 (en) | 2007-03-08 |
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