EP3233331B1 - Delivery device for a metal bath in a diecasting unit - Google Patents
Delivery device for a metal bath in a diecasting unit Download PDFInfo
- Publication number
- EP3233331B1 EP3233331B1 EP15822908.8A EP15822908A EP3233331B1 EP 3233331 B1 EP3233331 B1 EP 3233331B1 EP 15822908 A EP15822908 A EP 15822908A EP 3233331 B1 EP3233331 B1 EP 3233331B1
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- European Patent Office
- Prior art keywords
- accordance
- piston
- cylinder bore
- cooling
- feed
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
- B22D17/04—Plunger machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2023—Nozzles or shot sleeves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/203—Injection pistons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2038—Heating, cooling or lubricating the injection unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/30—Accessories for supplying molten metal, e.g. in rations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
Definitions
- the invention relates to a delivery device for a molten metal in an injection pressure unit, with a reservoir for the molten metal and a delivery channel in which the molten metal is fed to a mold cavity, wherein the delivery channel comprises a cylinder bore in which a piston is arranged axially adjustable, and wherein the cylinder bore is provided with a collecting chamber for the molten metal, from which the molten metal can be introduced into the mold cavity as a result of an axial displacement of the piston by a further line, the cylinder bore being surrounded by a first heating device which has at least one heating element.
- a liquid metal which is usually a metal alloy, is introduced into a mold cavity and cures therein, so that a metallic component corresponding to the mold cavity is formed.
- the introduction of the molten metal takes place under a pressure under which the molten metal is set.
- a molten metal conveying apparatus in which the molten metal is supplied from a reservoir to a collecting chamber formed in a cylinder bore, whereupon a piston in the cylinder bore is axially displaced, whereby the molten metal is forced out of the collecting chamber is and passes into a further line in which it is fed to the mold cavity.
- the quality of the metal component produced with a corresponding injection molding unit depends essentially on the fact that the molten metal has sufficient fluidity on its conveying path between the reservoir and the mold cavity and does not become viscous on the conveying path or even solidifies. To achieve this, it is known to heat the molten metal in the reservoir to a sufficient temperature to ensure that the molten metal still has a sufficiently high temperature and thus a good flowability even when it enters the mold cavity. In practice, however, it has proved to be relatively difficult to ensure sufficient temperature control and thus flowability for the large number of possible metal alloys which can be processed with the injection molding unit.
- the invention has for its object to provide a conveyor device of the type mentioned, in which damage or functional impairment due to excessive heat is avoided.
- a conveying device for a molten metal in a spray pressure unit with the features of claim 1. It is provided in a known manner that the cylinder bore, in which the collecting chamber is formed, is surrounded by a first heating device, which has at least one heating element.
- the basic idea is to set or hold the molten metal on its conveying path between the reservoir and the mold cavity, at least in sections, by using a first heating device to a desired temperature in order to prevent the molten metal from losing its fluidity on its conveying path.
- a first heating device in the region of the cylinder bore has the further advantage that the molten metal in the reservoir does not have to be heated excessively, so that the risk is prevented that by the excessive heating of the molten metal in the reservoir further attachments, especially electronic Controls or drive devices of the conveyor damaged or they are limited in their function.
- the piston can be adjusted axially within the cylinder bore to push out of the molten metal in the collection chamber out of this.
- a preferably electric or hydraulic drive device and / or an electronic control device is provided, which are usually arranged at the upper, the collection chamber remote from the end of the piston.
- the drive device and / or the control device are temperature-sensitive components that tend to malfunction if overheated.
- Order a proper Operation of the drive device and / or the control device to ensure despite the heating of the molten metal by the first heater is provided according to the invention that the drive device and / or the control device is associated with a cooling device.
- the cooling device can either be an electric cooling device, for example a Peltier element, or cooling channels through which a cooling fluid and in particular a cooling fluid flows.
- a partition wall is provided, which is penetrated by the piston.
- the partition wall serves as a heat shield and shields the area heated by the heater and the area cooled by the cooling device from each other.
- the partition wall can be cooled by means of the cooling device by, for example, a cooling channel is integrated into the partition wall.
- the first heater comprises a plurality of evenly distributed over the circumference of the cylinder bore, in particular arranged heating elements, which may for example be at a radial distance from the cylinder bore and parallel to this.
- the heating elements may be formed by electric heating cartridges, which are each inserted into a bore in the housing of the conveying device.
- the heating cartridges are an electrical resistance heating, but alternatively it is also possible that the first heater is formed by channels, which are flowed through by a hot fluid and in particular a hot liquid.
- the number and arrangement of the heating elements depends on the size of the injection molding apparatus and in particular the cylinder bore, but in practice it has proven to be useful when four to eight heating elements are used, but the invention is not limited thereto.
- An exact temperature of the wall of the cylinder bore and the surrounding components and thus the molten metal can be achieved if the heating elements are individually and / or group-controlled.
- a control can be used in which the temperature of the individual heating elements and / or molten metal and / or the wall of the cylinder bore is detected and evaluated, wherein the heating elements are controlled individually or in groups to a desired temperature or a to achieve the desired temperature profile.
- the piston has an axial bore in which a valve rod is slidably received.
- the valve rod at its end facing away from the collection chamber has a valve rod drive device, in particular in the form of an electric drive motor or a hydraulic drive device and / or an electronic control device, wherein the valve rod drive device and / or the control device by means of the cooling device can be cooled is. In this way, a proper function of the valve rod drive device and / or the control device and thus the valve stem is ensured.
- the reservoir of the molten metal is assigned a second heating device which can be controlled independently of the first heating device for the cylinder bore.
- the molten metal in the reservoir has been kept under a protective gas atmosphere.
- a protective gas atmosphere for example, the interior of the reservoir above the molten metal with carbon dioxide (CO 2 ) or nitrogen (N 2 ) are filled and acted upon.
- the molten metal is forced out of the collection chamber by the piston and enters a further line, in which usually a check valve is arranged.
- a check valve is assigned a third heating device which can be controlled independently of the first heating device for the cylinder bore and independently of the second heating device for the reservoir.
- Both the second heating device and the third heating device can be formed by electrical resistance heaters, for example heating cartridges, but it is also possible to provide heating channels through which a hot fluid and in particular a hot fluid flows.
- FIG. 1 illustrated conveying device 10 for a molten metal M in a spray pressure unit has a housing 11 in which a vertical receiving bore 12 is formed.
- a reservoir 26 is provided, which is filled with the molten metal M.
- the molten metal M can be supplied in liquid form to the reservoir 26 or be generated in this by melting, for example, a metal granules.
- the reservoir 26 is airtight covered by a cover member 45 and formed above the molten metal M in the reservoir 26 space 46 is filled with a protective gas, such as carbon dioxide (CO 2 ) or nitrogen (N 2 ).
- a protective gas such as carbon dioxide (CO 2 ) or nitrogen (N 2 ).
- a second heater 43 is integrated in the region of the reservoir 26, which may be an electrical resistance heater, with which the wall of the reservoir 26 and thus the molten metal M can be brought to a desired temperature or held on this.
- the reservoir 26 is connected via at least one obliquely downwardly in the flow direction inclined inlet channel 18 with the receiving bore 12 in connection.
- a fitting 28 is inserted with close fit, which has a tubular configuration and is closed at its lower end.
- the fitting 28 is replaceably held in the receiving bore 12 and has a central axial cylinder bore 27 which is configured in the form of an upwardly opening blind bore.
- an obliquely extending connecting bore 30 is provided, which is aligned with the inlet channel 18 and connects it with the cylinder bore 27.
- a piston 13 is slidably inserted under close fit.
- an annular space 17 is formed on the outer side of the piston 13.
- a plurality of filling bores 16 arranged distributed over the circumference of the piston 13 in the piston 13 in each case extend to the lower end face of the piston 13. That region of the piston 13 in which the filling bores 16 are formed lies in a sealed manner against the inner wall the cylinder bore 27 at.
- the piston rings 31 consist for example of a spring steel.
- the piston 13 further comprises a central axial bore 14 in which a valve rod 19 is slidably disposed, which completely penetrates the piston 13 and carries at its lower end downstream of the end face of the piston 13 a plate-like valve body 20.
- the valve body 20 can by displacing the valve rod 19 relative to the piston 13 between an in FIG. 1 illustrated closed position in which the valve body 20 prevents leakage of molten metal from the filling holes 16, and be adjusted to an open position, not shown, in which the molten metal from the filling holes in an underlying, formed in the cylinder bore 27 collecting chamber 15 can flow.
- the cross section of the valve body 20 is smaller than the cross section of the cylinder bore 27, so that the valve body 20 within the cylinder bore 27 has a sealing function and the molten metal M, the valve body 20 can flow freely.
- an only indicated pressure sensor 49 Arranged in the collecting chamber 15 is an only indicated pressure sensor 49, which via a line supplies a pressure signal to a control device, not shown, which controls the drive of the piston 14. In this way, a control loop for the drive (hydraulic cylinder) of the piston 14 is given.
- the cylinder bore 27 and the collecting chamber 15 formed in its lower region is connected at the lower end via a continuing line 21 with a mold cavity, not shown.
- the continuing line 21 comprises a lower transverse bore 32 in the wall of the fitting 28, which is aligned with a further transverse bore 33 in the housing 21 through which the collecting chamber 15 is connected to a vertical riser 22.
- the riser 22 passes at its upper end in a filling channel 23, from which the molten metal is supplied to the mold space, as indicated by the arrow F.
- a check valve 24 is arranged, which has a valve body 25 which is tensioned by a spring 34 against the flow direction against a valve seat 35.
- the cylinder bore 27 and the fitting 28 are surrounded by a first heater 36, which has a plurality of distributed over the circumference of the fitting piece 28 arranged heating elements 37, which are each inserted into a bore formed in the housing, as in FIG. 1 indicated by dashed lines.
- the arrangement of the heating elements 37 which are preferably electrical heating cartridges, is in FIG. 2 shown. It can be seen that six heating elements 37 are provided which are distributed uniformly over the circumference of the fitting piece 28 and preferably each individually or in groups can be controlled. With the aid of the heating device 36, it is possible to bring the molten metal M in the region of the connecting bore 30, the filling holes 16, the collecting chamber 15 and at least partially in the continuing line 21 to a desired temperature or to keep this.
- the check valve 24 is associated with a third heater 44, with which the molten metal, which flows through the check valve 24, is tempered, in particular within the check valve 24.
- the third heating device 44 may be formed by an electrical resistance heating or heating channels, which are flowed through by a hot fluid and in particular a hot liquid.
- the collecting chamber 15 facing away from the end of the piston 13 and the valve rod 19 is disposed in a outside of the housing 11 arranged drive and control housing 47, in which an only indicated drive device 38 for the piston 13 and also only indicated valve rod driving device 41 are arranged , with which the piston 13 and the valve rod 19 are axially adjustable. Also within the drive and control housing 47, an electronic control device 48 is provided in particular for the said drive devices, which is indicated only schematically.
- the drive and control housing 47 has on its side facing the housing 11 a partition wall 40 which is penetrated by the piston 13 and the valve rod 19 under close fit and which serves as a thermal shield.
- a cooling device 39 which comprises a plurality of cooling channels 42, which are flowed through by a cooling liquid and extend through both the drive and control housing 47 and through the partition 40.
- the cooling device 39 it is possible, the interior of the drive and control housing 47 and thus the drive device 38th for the piston 13, the valve-rod driving device 41 and the electronic control device 48 to an advantageous operating temperature of preferably ⁇ 80 ° C, since due to the heater 36 there is a risk that the components mentioned otherwise become too hot and damaged.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Description
Die Erfindung betrifft eine Fördervorrichtung für eine Metallschmelze in einem Spritzdruckaggregat, mit einem Vorratsbehälter für die Metallschmelze und einem Förderkanal, in dem die Metallschmelze einem Formhohlraum zuführbar ist, wobei der Förderkanal eine Zylinderbohrung umfasst, in der ein Kolben axial verstellbar angeordnet ist, und wobei in der Zylinderbohrung eine Sammelkammer für die Metallschmelze vorgesehen ist, aus der die Metallschmelze infolge einer axialen Verschiebung des Kolbens durch eine weiterführende Leitung in den Formhohlraum einbringbar ist, wobei die Zylinderbohrung von einer 1. Heizvorrichtung umgeben ist, die zumindest ein Heizelement aufweist.The invention relates to a delivery device for a molten metal in an injection pressure unit, with a reservoir for the molten metal and a delivery channel in which the molten metal is fed to a mold cavity, wherein the delivery channel comprises a cylinder bore in which a piston is arranged axially adjustable, and wherein the cylinder bore is provided with a collecting chamber for the molten metal, from which the molten metal can be introduced into the mold cavity as a result of an axial displacement of the piston by a further line, the cylinder bore being surrounded by a first heating device which has at least one heating element.
Bei einer Metallgussmaschine wird ein flüssiges Metall, bei dem es sich üblicherweise um eine Metalllegierung handelt, in einen Formhohlraum eingebracht und härtet in diesem aus, so dass ein dem Formhohlraum entsprechendes metallisches Bauteil gebildet ist. Die Einbringung der Metallschmelze erfolgt dabei unter einem Druck, unter den die Metallschmelze gesetzt wird.In a metal casting machine, a liquid metal, which is usually a metal alloy, is introduced into a mold cavity and cures therein, so that a metallic component corresponding to the mold cavity is formed. The introduction of the molten metal takes place under a pressure under which the molten metal is set.
Aus der
Die Qualität des mit einem entsprechenden Spritzgussaggregat hergestellten Metall-Bauteils hängt wesentlich davon ab, dass die Metallschmelze auf ihrem Förderweg zwischen dem Vorratsbehälter und dem Formhohlraum eine ausreichende Fließfähigkeit besitzt und nicht auf dem Förderweg zähflüssig wird oder sich sogar verfestigt. Um dies zu erreichen ist es bekannt, die Metallschmelze in dem Vorratsbehälter auf eine ausreichend Temperatur zu erwärmen, um sicherzustellen, dass die Metallschmelze auch beim Eintritt in den Formhohlraum noch eine ausreichend hohe Temperatur und damit eine gute Fließfähigkeit besitzt. Es hat sich in der Praxis jedoch als relativ schwierig erwiesen, für die Vielzahl von möglichen Metalllegierungen, die mit dem Spritzgussaggregat verarbeitet werden können, eine ausreichende Temperierung und damit Fließfähigkeit sicherzustellen.The quality of the metal component produced with a corresponding injection molding unit depends essentially on the fact that the molten metal has sufficient fluidity on its conveying path between the reservoir and the mold cavity and does not become viscous on the conveying path or even solidifies. To achieve this, it is known to heat the molten metal in the reservoir to a sufficient temperature to ensure that the molten metal still has a sufficiently high temperature and thus a good flowability even when it enters the mold cavity. In practice, however, it has proved to be relatively difficult to ensure sufficient temperature control and thus flowability for the large number of possible metal alloys which can be processed with the injection molding unit.
Im Oberbegriff des Anspruchs 1 wird von einer Fördervorrichtung ausgegangen, wie sie in der
Der Erfindung liegt die Aufgabe zugrunde, eine Fördervorrichtung der genannten Art zu schaffen, bei der eine Beschädigung oder funktionale Beeinträchtigung infolge übermäßiger Wärmeeinwirkung vermieden ist.The invention has for its object to provide a conveyor device of the type mentioned, in which damage or functional impairment due to excessive heat is avoided.
Diese Aufgabe wird erfindungsgemäß durch eine Fördervorrichtung für eine Metallschmelze in einem Spritzdruckaggregat mit den Merkmalen des Anspruchs 1 gelöst. Dabei ist in bekannter Weise vorgesehen, dass die Zylinderbohrung, in der die Sammelkammer ausgebildet ist, von einer 1. Heizvorrichtung umgeben ist, die zumindest ein Heizelement aufweist.This object is achieved by a conveying device for a molten metal in a spray pressure unit with the features of
Erfindungsgemäß wird von der Grundüberlegung ausgegangen, die Metallschmelze auf ihrem Förderweg zwischen dem Vorratsbehälter und dem Formhohlraum zumindest abschnittsweise durch Verwendung einer 1. Heizvorrichtung auf eine gewünschte Temperatur einzustellen oder zu halten, um zu verhindern, dass die Metallschmelze auf ihrem Förderweg an Fließfähigkeit verliert. Andererseits ist mit der Verwendung der 1. Heizvorrichtung im Bereich der Zylinderbohrung der weitere Vorteil verbunden, dass die Metallschmelze im Vorratsbehälter nicht übermäßig aufgeheizt werden muss, so dass die Gefahr unterbunden ist, dass durch die übermäßige Aufheizung der Metallschmelze im Vorratsbehälter weitere Anbauteile, insbesondere elektronische Steuerungen oder Antriebsvorrichtungen der Fördervorrichtung beschädigt oder diese in ihrer Funktion eingeschränkt werden.According to the invention, the basic idea is to set or hold the molten metal on its conveying path between the reservoir and the mold cavity, at least in sections, by using a first heating device to a desired temperature in order to prevent the molten metal from losing its fluidity on its conveying path. On the other hand, with the use of the first heating device in the region of the cylinder bore has the further advantage that the molten metal in the reservoir does not have to be heated excessively, so that the risk is prevented that by the excessive heating of the molten metal in the reservoir further attachments, especially electronic Controls or drive devices of the conveyor damaged or they are limited in their function.
Der Kolben kann innerhalb der Zylinderbohrung axial verstellt werden, um die in der Sammelkammer befindliche Metallschmelze aus dieser herauszudrücken. Zu diesem Zweck ist eine vorzugsweise elektrische oder hydraulische Antriebsvorrichtung und/oder eine elektronische Steuervorrichtung vorgesehen, die üblicherweise am oberen, der Sammelkammer abgewandten Ende des Kolbens angeordnet sind. Die Antriebsvorrichtung und/oder die Steuervorrichtung sind temperaturempfindliche Bauelemente, die bei übermäßiger Erwärmung zu einer Fehlfunktion neigen. Um einen ordnungsgemäßen Betrieb der Antriebsvorrichtung und/oder der Steuervorrichtung trotz der Erwärmung der Metallschmelze durch die 1. Heizvorrichtung zu gewährleisten, ist gemäß der Erfindung vorgesehen, dass der Antriebsvorrichtung und/oder der Steuervorrichtung eine Kühlvorrichtung zugeordnet ist. Bei der Kühlvorrichtung kann es sich entweder um eine elektrische Kühlvorrichtung, beispielsweise ein Peltier-Element, oder um Kühlkanäle handeln, die von einem Kühlfluid und insbesondere einer Kühlflüssigkeit durchströmt sind.The piston can be adjusted axially within the cylinder bore to push out of the molten metal in the collection chamber out of this. For this purpose, a preferably electric or hydraulic drive device and / or an electronic control device is provided, which are usually arranged at the upper, the collection chamber remote from the end of the piston. The drive device and / or the control device are temperature-sensitive components that tend to malfunction if overheated. Order a proper Operation of the drive device and / or the control device to ensure despite the heating of the molten metal by the first heater is provided according to the invention that the drive device and / or the control device is associated with a cooling device. The cooling device can either be an electric cooling device, for example a Peltier element, or cooling channels through which a cooling fluid and in particular a cooling fluid flows.
Zwischen der Heizvorrichtung und der Kühlvorrichtung ist eine Trennwand vorgesehen, die vom Kolben durchdrungen ist. Die Trennwand dient als Wärmeschild und schirmt den mittels der Heizvorrichtung erwärmten Bereich und den mittels der Kühlvorrichtung gekühlten Bereich voneinander ab.Between the heater and the cooling device, a partition wall is provided, which is penetrated by the piston. The partition wall serves as a heat shield and shields the area heated by the heater and the area cooled by the cooling device from each other.
In bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass die Trennwand mittels der Kühlvorrichtung kühlbar ist, indem beispielsweise ein Kühlkanal in die Trennwand integriert ist.In a preferred embodiment of the invention it is provided that the partition wall can be cooled by means of the cooling device by, for example, a cooling channel is integrated into the partition wall.
Vorzugsweise umfasst die 1. Heizvorrichtung mehrere über den Umfang der Zylinderbohrung insbesondere gleichmäßig verteilt angeordnete Heizelemente, die beispielsweise in radialem Abstand zur Zylinderbohrung und parallel zu dieser verlaufen können. Die Heizelemente können von elektrischen Heizpatronen gebildet sein, die jeweils in eine Bohrung im Gehäuse der Fördervorrichtung eingesetzt sind. Die Heizpatronen stellen eine elektrische Widerstandsheizung dar, alternativ ist es jedoch auch möglich, dass die 1. Heizvorrichtung von Kanälen gebildet ist, die von einem heißen Fluid und insbesondere einer heißen Flüssigkeit durchströmt sind.Preferably, the first heater comprises a plurality of evenly distributed over the circumference of the cylinder bore, in particular arranged heating elements, which may for example be at a radial distance from the cylinder bore and parallel to this. The heating elements may be formed by electric heating cartridges, which are each inserted into a bore in the housing of the conveying device. The heating cartridges are an electrical resistance heating, but alternatively it is also possible that the first heater is formed by channels, which are flowed through by a hot fluid and in particular a hot liquid.
Die Anzahl und Anordnung der Heizelemente hängt von der Größe der Spritzgussvorrichtung und insbesondere der Zylinderbohrung ab, in der Praxis hat es sich jedoch als sinnvoll erwiesen, wenn vier bis acht Heizelemente verwendet werden, jedoch ist die Erfindung darauf nicht beschränkt.The number and arrangement of the heating elements depends on the size of the injection molding apparatus and in particular the cylinder bore, but in practice it has proven to be useful when four to eight heating elements are used, but the invention is not limited thereto.
Eine exakte Temperierung der Wandung der Zylinderbohrung sowie der umgebenden Bauteile und damit auch der Metallschmelze lässt sich erzielen, wenn die Heizelemente einzeln und/oder gruppenweise ansteuerbar sind. In Weiterbildung der Erfindung kann eine Regelung eingesetzt werden, bei der die Temperatur der einzelnen Heizelemente und/oder der Metallschmelze und/oder der Wandung der Zylinderbohrung erfasst und ausgewertet wird, wobei die Heizelemente einzeln oder gruppenweise angesteuert werden, um eine gewünschte Temperatur bzw. ein gewünschtes Temperaturprofil zu erzielen.An exact temperature of the wall of the cylinder bore and the surrounding components and thus the molten metal can be achieved if the heating elements are individually and / or group-controlled. In a further development of the invention, a control can be used in which the temperature of the individual heating elements and / or molten metal and / or the wall of the cylinder bore is detected and evaluated, wherein the heating elements are controlled individually or in groups to a desired temperature or a to achieve the desired temperature profile.
Es ist bekannt, dass der Kolben eine Axialbohrung aufweist, in der eine Ventilstange verschieblich aufgenommen ist. Dabei kann vorgesehen sein, dass die Ventilstange an ihrem der Sammelkammer abgewandten Ende eine Ventilstangen-Antriebsvorrichtung insbesondere in Form eines elektrischen Antriebsmotors oder einer hydraulischen Antriebsvorrichtung und/oder eine elektronische Steuervorrichtung aufweist, wobei die Ventilstangen-Antriebsvorrichtung und/oder die Steuervorrichtung mittels der Kühlvorrichtung kühlbar ist. Auf diese Weise ist auch eine ordnungsgemäße Funktion der Ventilstangen-Antriebsvorrichtung und/oder der Steuervorrichtung und somit der Ventilstange gewährleistet.It is known that the piston has an axial bore in which a valve rod is slidably received. It can be provided that the valve rod at its end facing away from the collection chamber has a valve rod drive device, in particular in the form of an electric drive motor or a hydraulic drive device and / or an electronic control device, wherein the valve rod drive device and / or the control device by means of the cooling device can be cooled is. In this way, a proper function of the valve rod drive device and / or the control device and thus the valve stem is ensured.
Um eine ausreichende Fließfähigkeit der Metallschmelze auf dem Förderweg zu gewährleisten, ist es hilfreich, dass die Metallschmelze in dem Vorratsbehälter exakt temperiert ist.In order to ensure sufficient flowability of the molten metal on the conveying path, it is helpful that the molten metal in the reservoir is exactly tempered.
Zu diesem Zweck kann vorgesehen sein, dass dem Vorratsbehälter der Metallschmelze eine 2. Heizvorrichtung zugeordnet ist, die unabhängig von der 1. Heizvorrichtung für die Zylinderbohrung ansteuerbar ist.For this purpose it can be provided that the reservoir of the molten metal is assigned a second heating device which can be controlled independently of the first heating device for the cylinder bore.
Darüber hinaus ist es für die Fließfähigkeit der Metallschmelze sinnvoll, wenn vermieden ist, dass sich auf der Oberfläche der Metallschmelze in dem Vorratsbehälter eine übermäßige Schlackeschicht bildet, da dann die Gefahr besteht, dass Schlacketeilchen in den Förderweg durch die Fördervorrichtung gelangen. Um dies zu verhindern, kann in Weiterbildung der Erfindung vorgesehen sein, dass die Metallschmelze in dem Vorratsbehälter unter Schutzgasatmosphäre gehalten hat. Zu diesem Zweck kann beispielsweise der Innenraum des Vorratsbehälters oberhalb der Metallschmelze mit Kohlenstoffdioxid (CO2) oder Stickstoff (N2) gefüllt und beaufschlagt werden.Moreover, it makes sense for the flowability of the molten metal, if it is avoided that forms an excessive slag layer on the surface of the molten metal in the reservoir, since then there is a risk that slag particles get into the conveying path through the conveyor. To prevent this, it can be provided in a further development of the invention that the molten metal in the reservoir has been kept under a protective gas atmosphere. For this purpose, for example, the interior of the reservoir above the molten metal with carbon dioxide (CO 2 ) or nitrogen (N 2 ) are filled and acted upon.
Die Metallschmelze wird aus der Sammelkammer durch den Kolben herausgedrückt und gelangt in eine weiterführende Leitung, in der üblicherweise ein Rückschlagventil angeordnet ist. In Weiterbildung der Erfindung ist vorgesehen, dass dem Rückschlagventil eine 3. Heizvorrichtung zugeordnet ist, die unabhängig von der 1. Heizvorrichtung für die Zylinderbohrung und unabhängig von der 2. Heizvorrichtung für den Vorratsbehälter ansteuerbar ist.The molten metal is forced out of the collection chamber by the piston and enters a further line, in which usually a check valve is arranged. In a further development of the invention, it is provided that the check valve is assigned a third heating device which can be controlled independently of the first heating device for the cylinder bore and independently of the second heating device for the reservoir.
Sowohl die 2. Heizvorrichtung als auch die 3. Heizvorrichtung können von elektrischen Widerstandsheizungen, beispielsweise Heizpatronen, gebildet sein, es ist jedoch auch möglich, Heizkanäle vorzusehen, die von einem heißen Fluid und insbesondere einer heißen Flüssigkeit durchströmt sind.Both the second heating device and the third heating device can be formed by electrical resistance heaters, for example heating cartridges, but it is also possible to provide heating channels through which a hot fluid and in particular a hot fluid flows.
Weitere Einzelheiten und Merkmale der Erfindung sind aus der folgenden Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnungen ersichtlich. Es zeigen:
- Fig. 1
- einen Längsschnitt durch eine erfindungsgemäße Fördervorrichtung und
- Fig. 2
- eine vergrößerte perspektivische Ansicht der Zylinderbohrung mit außenseitiger Heizvorrichtung.
- Fig. 1
- a longitudinal section through a conveyor device according to the invention and
- Fig. 2
- an enlarged perspective view of the cylinder bore with outside heater.
Eine in
In dem Gehäuse 11 ist ein Vorratsbehälter 26 vorgesehen, der mit der Metallschmelze M gefüllt ist. Die Metallschmelze M kann in flüssiger Form dem Vorratsbehälter 26 zugeführt oder in diesem durch Aufschmelzen beispielsweise eines Metall-Granulats erzeugt werden.In the
Der Vorratsbehälter 26 ist mittels eines Deckelteils 45 luftdicht abgedeckt und der oberhalb der Metallschmelze M in dem Vorratsbehälter 26 gebildet Freiraum 46 ist mit einem Schutzgas, beispielsweise Kohlenstoffdioxid (CO2) oder Stickstoff (N2) gefüllt.The
In das Gehäuse 11 ist im Bereich des Vorratsbehälters 26 eine 2. Heizvorrichtung 43 integriert, bei der es sich um eine elektrische Widerstandheizung handeln kann, mit der die Wandung des Vorratsbehälters 26 und somit die Metallschmelze M auf eine gewünschte Temperatur gebracht oder auf dieser gehalten werden kann.In the
Der Vorratsbehälter 26 steht über mindestens einen schräg nach unten in Strömungsrichtung geneigt verlaufenden Zulaufkanal 18 mit der Aufnahmebohrung 12 in Verbindung. In die Aufnahmebohrung 12 ist unter enger Passung ein Passstück 28 eingesetzt, das eine rohrförmige Konfiguration besitzt und an seinem unteren Ende verschlossen ist. Das Passstück 28 ist auswechselbar in der Aufnahmebohrung 12 gehalten und besitzt eine mittige axiale Zylinderbohrung 27, die in Form einer nach oben öffnenden Sackbohrung ausgestaltet ist. In der Wandung des Passstücks 28 ist eine schräg verlaufende Verbindungsbohrung 30 vorgesehen, die mit dem Zulaufkanal 18 fluchtet und diesen mit der Zylinderbohrung 27 verbindet.The
In die Zylinderbohrung 27 ist ein Kolben 13 unter enger Passung verschieblich eingesetzt. In einem in der unteren Hälfte der axialen Länge des Kolbens 13 angeordneten Bereich, der einen axialen Abstand vom unteren Ende des Kolbens 13 aufweist, ist auf der Außenseite des Kolbens 13 ein Ringraum 17 ausgebildet. Am unteren Ende des Ringraums 17 verlaufen mehrere über den Umfang des Kolbens 13 verteilt angeordnete Füllbohrungen 16 im Kolben 13 jeweils zur unteren Stirnfläche des Kolbens 13. Derjenige Bereich des Kolbens 13, in dem die Füllbohrungen 16 ausgebildet sind, liegt in abgedichteter Weise an der Innenwandung der Zylinderbohrung 27 an.In the cylinder bore 27, a
Auf der äußeren Mantelfläche des Kolbens 13 sind zwei axial beabstandete, umlaufende Nuten 29 ausgebildet, in die jeweils ein geschlitzter Kolbenring 31 eingesetzt ist, der unter einer radial nach außen gegen die Innenwandung der Zylinderbohrung 27 gerichteten Federspannung an dieser dichtend anliegt. Die Kolbenringe 31 bestehen beispielsweise aus einem Federstahl.On the outer circumferential surface of the
Der Kolben 13 weist des weiteren eine zentrische Axialbohrung 14 auf, in der eine Ventilstange 19 verschieblich angeordnet ist, die den Kolben 13 vollständig durchdringt und an ihrem unteren Ende stromab der Stirnseite des Kolbens 13 einen tellerartigen Ventilkörper 20 trägt. Der Ventilkörper 20 kann durch Verschieben der Ventilstange 19 relativ zum Kolben 13 zwischen einer in
Der Querschnitt des Ventilkörpers 20 ist kleiner als der Querschnitt der Zylinderbohrung 27, so dass der Ventilkörper 20 innerhalb der Zylinderbohrung 27 eine Dichtfunktion hat und die Metallschmelze M den Ventilkörper 20 frei umströmen kann.The cross section of the
In der Sammelkammer 15 ist ein nur angedeuteter Drucksensor 49 angeordnet, der über eine Leitung ein Drucksignal an einer nicht dargestellten Steuervorrichtung gibt, die den Antrieb des Kolbens 14 steuert. Auf diese Weise ist ein Regelkreis für den Antrieb (Hydraulikzylinder) des Kolbens 14 gegeben.Arranged in the collecting
Die Zylinderbohrung 27 bzw. die in ihrem unteren Bereich gebildete Sammelkammer 15 ist am unteren Ende über eine weiterführende Leitung 21 mit einem nicht näher dargestellten Formhohlraum verbunden. Die weiterführende Leitung 21 umfasst eine untere Querbohrung 32 in der Wandung des Passstücks 28, die mit einer weiterführenden Querbohrung 33 im Gehäuse 21 fluchtet, über die die Sammelkammer 15 mit einer vertikalen Steigleitung 22 verbunden ist. Die Steigleitung 22 geht an ihrem oberen Ende in einen Füllkanal 23 über, aus dem die Metallschmelze dem Formraum zugeführt wird, wie durch den Pfeil F angedeutet ist. Im Übergang zwischen der Steigleitung 22 und dem Füllkanal 23 ist ein Rückschlagventil 24 angeordnet, das einen Ventilkörper 25 aufweist, der von einer Feder 34 entgegen der Strömungsrichtung gegen einen Ventilsitz 35 gespannt wird.The cylinder bore 27 and the collecting
Die Zylinderbohrung 27 und das Passstück 28 sind von einer 1. Heizvorrichtung 36 umgeben, die mehrere über den Umfang des Passstückes 28 verteilt angeordnete Heizelemente 37 aufweist, die jeweils in eine im Gehäuse ausgebildete Bohrung eingesetzt sind, wie es in
Wie in
Das der Sammelkammer 15 abgewandte Ende des Kolbens 13 und der Ventilstange 19 ist in einem außenseitig des Gehäuses 11 angeordneten Antriebs- und Steuerungsgehäuse 47 angeordnet, in dem eine nur angedeutete Antriebsvorrichtung 38 für den Kolben 13 und eine ebenfalls nur angedeutete Ventilstangen-Antriebsvorrichtung 41 angeordnet sind, mit denen der Kolben 13 bzw. die Ventilstange 19 axial verstellbar sind. Ebenfalls innerhalb des Antriebs- und Steuerungsgehäuses 47 ist eine elektronische Steuervorrichtung 48 insbesondere für die genannten Antriebsvorrichtungen vorgesehen, die nur schematisch angedeutet ist. Das Antriebs- und Steuerungsgehäuse 47 besitzt auf seiner dem Gehäuse 11 zugewandten Seite eine Trennwand 40, die von dem Kolben 13 und der Ventilstange 19 unter enger Passung durchdrungen ist und die als thermische Abschirmung dient.The collecting
Ferner ist in dem Antriebs- und Steuerungsgehäuse 47 eine Kühlvorrichtung 39 vorgesehen, die mehrere Kühlkanäle 42 umfasst, die von einer Kühlflüssigkeit durchströmt sind und sowohl durch das Antriebs- und Steuerungsgehäuse 47 als auch durch die Trennwand 40 verlaufen. Mittels der Kühlvorrichtung 39 ist es möglich, den Innenraum des Antriebs- und Steuerungsgehäuses 47 und damit die Antriebsvorrichtung 38 für den Kolben 13, die Ventilstangen-Antriebsvorrichtung 41 und die elektronische Steuervorrichtung 48 auf eine vorteilhafte Betriebstemperatur von vorzugsweise < 80°C zu halten, da aufgrund der Heizvorrichtung 36 die Gefahr besteht, dass die genannten Bauteile ansonsten zu heiß und dadurch beschädigt werden.Further, in the drive and control
Claims (11)
- Feed device for a metal melt (M) in an injection molding device, with a reservoir (26) for the metal melt (M) and with a feed duct, in which the metal melt (M) can be fed to a mold cavity, wherein the feed duct comprises a cylinder bore (27), in which a piston (13) is arranged axially displaceably, and wherein a collection chamber (15) for the metal melt (M), from which the metal melt (M) can be introduced into the mold cavity through a continuing line (21) as a consequence of an axial displacement of the piston (13), is provided in the cylinder bore (27), wherein the cylinder bore (27) is surrounded by a first heater (36), which has at least one heating element (37), characterized in that at its end facing away from the collection chamber (15), the piston (13) has a driving device (38) and/or a control device (48), that a cooling device (39) is associated with the driving device (38) and/or the control device (48) such that this/these can be cooled by the cooling device (39); and that a partition (40), through which the piston (13) passes, is provided between the first heater (36) and the cooling device (39).
- Feed device in accordance with claim 1, characterized in that the partition (40) can be cooled by means of the cooling device (39).
- Feed device in accordance with claim 1 or 2, characterized in that a plurality of heating elements (37) arranged distributed over the circumference of the cylinder bore (27) are provided.
- Feed device in accordance with claim 3, characterized in that the heating elements (37) are heating cartridges extending at radially spaced locations from and parallel to the cylinder bore (27).
- Feed device in accordance with one of the claims 1 through 4, characterized in that four to eight heating elements (37) are provided.
- Feed device in accordance with one of the claims 4 or 5, characterized in that the heating elements (37) can be actuated individually and/or in groups.
- Feed device in accordance with one of the claims 1 through 6, characterized in that the piston (13) has an axial hole (14), in which a valve rod (19) is received displaceably, that the valve rod (19) has a valve rod driving device (41) at its end facing away from the collection chamber (15) and that the valve rod driving device (41) and/or the control device (48) can be cooled by means of the cooling device (39).
- Feed device in accordance with one of the claims 1 through 7, characterized in that the cooling device (19) comprises at least one cooling duct (42), through which a cooling fluid, especially a cooling liquid flows.
- Feed device in accordance with one of the claims 1 through 8, characterized in that the metal melt (M) can be maintained in the reservoir (26) under a protective gas atmosphere.
- Feed device in accordance with one of the claims 1 through 9, characterized in that a second heater (43) is associated with the reservoir (26) of the metal melt (M).
- Feed device in accordance with one of the claims 1 through 10, characterized in that a nonreturn valve (24) is arranged in the continuing line and that a third heater (44) is associated with the nonreturn valve (24).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014018798.5A DE102014018798A1 (en) | 2014-12-19 | 2014-12-19 | Delivery device for a molten metal in an injection molding unit |
PCT/EP2015/002517 WO2016096120A2 (en) | 2014-12-19 | 2015-12-15 | Delivery device for a metal bath in a diecasting unit |
Publications (2)
Publication Number | Publication Date |
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EP3233331A2 EP3233331A2 (en) | 2017-10-25 |
EP3233331B1 true EP3233331B1 (en) | 2019-07-31 |
Family
ID=55080076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15822908.8A Active EP3233331B1 (en) | 2014-12-19 | 2015-12-15 | Delivery device for a metal bath in a diecasting unit |
Country Status (7)
Country | Link |
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US (1) | US10675677B2 (en) |
EP (1) | EP3233331B1 (en) |
JP (1) | JP6749328B2 (en) |
CN (1) | CN107206478B (en) |
CA (1) | CA2971496A1 (en) |
DE (1) | DE102014018798A1 (en) |
WO (1) | WO2016096120A2 (en) |
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CN107866544A (en) * | 2017-11-08 | 2018-04-03 | 马鞍山市万鑫铸造有限公司 | A kind of casting device |
DE102018108915A1 (en) * | 2018-04-16 | 2019-10-17 | Atlas Copco Ias Gmbh | metering valve |
Family Cites Families (18)
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US3201836A (en) * | 1964-09-21 | 1965-08-24 | Mount Vernon Die Casting Corp | Method of, and apparatus for, die casting metals |
US3461946A (en) | 1966-09-14 | 1969-08-19 | Vasco Metals Corp | Method of die casting |
CA1253310A (en) * | 1986-10-17 | 1989-05-02 | Mold-Masters Limited | Fluid cooled hydraulic actuating mechanism for injection molding |
JP3422590B2 (en) | 1995-03-22 | 2003-06-30 | 本田技研工業株式会社 | Injection molding equipment for metal moldings |
JPH11188769A (en) * | 1997-12-25 | 1999-07-13 | Haruna:Kk | Injection molder, pellet loading device unit, injection molding system, injection molded product, and injection molding method |
JP2001030060A (en) | 1999-07-23 | 2001-02-06 | Mitsubishi Heavy Ind Ltd | Device for controlling solid phase ratio of semi-melting metal in semi-melting metal supplying apparatus |
DE20116677U1 (en) | 2001-10-12 | 2001-12-13 | Ortmann Druckgiestechnik Gmbh | Casting chamber for die casting metals |
US20030094257A1 (en) * | 2001-11-19 | 2003-05-22 | Takata Corporation | Shutterless injection molding method and apparatus |
DE10157349A1 (en) * | 2001-11-22 | 2003-06-12 | Demag Ergotech Gmbh | Device and method for casting metallic materials |
US7034263B2 (en) | 2003-07-02 | 2006-04-25 | Itherm Technologies, Lp | Apparatus and method for inductive heating |
US7279665B2 (en) | 2003-07-02 | 2007-10-09 | Itherm Technologies, Lp | Method for delivering harmonic inductive power |
JP2007061880A (en) | 2005-09-01 | 2007-03-15 | Kobe Steel Ltd | Injection molding apparatus |
DE102006010084B3 (en) * | 2006-02-24 | 2007-05-03 | Oskar Frech Gmbh + Co. Kg | Dosing arrangement for a hot chamber die casting machine comprises a heating arrangement having a flameless heating unit placed in a piston rod feeding bore and electrically insulated in a riser bore in the riser channel |
WO2007105646A1 (en) * | 2006-03-13 | 2007-09-20 | Sumitomo Heavy Industries, Ltd. | Injection molding machine |
DE102008025557B4 (en) * | 2008-05-28 | 2010-04-08 | gwk Gesellschaft Wärme Kältetechnik mbH | injection molding machine |
DE102012102549A1 (en) * | 2011-11-15 | 2013-05-16 | Ferrofacta Gmbh | Die casting nozzle and method for operating the die casting nozzle |
DE102012009412B4 (en) * | 2012-05-11 | 2014-09-18 | Incoe International, Inc. | Cooling device for the drive for adjusting the needle of a needle valve in hot runner systems for injection molding |
DE102012010923A1 (en) | 2012-06-04 | 2013-12-05 | Gebr. Krallmann Gmbh | Delivery device for a molten metal in an injection pressure unit |
-
2014
- 2014-12-19 DE DE102014018798.5A patent/DE102014018798A1/en not_active Withdrawn
-
2015
- 2015-12-15 US US15/535,888 patent/US10675677B2/en not_active Expired - Fee Related
- 2015-12-15 EP EP15822908.8A patent/EP3233331B1/en active Active
- 2015-12-15 WO PCT/EP2015/002517 patent/WO2016096120A2/en active Application Filing
- 2015-12-15 CN CN201580073565.5A patent/CN107206478B/en active Active
- 2015-12-15 JP JP2017532943A patent/JP6749328B2/en not_active Expired - Fee Related
- 2015-12-15 CA CA2971496A patent/CA2971496A1/en not_active Abandoned
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None * |
Also Published As
Publication number | Publication date |
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JP6749328B2 (en) | 2020-09-02 |
US20170348766A1 (en) | 2017-12-07 |
US10675677B2 (en) | 2020-06-09 |
CN107206478A (en) | 2017-09-26 |
CA2971496A1 (en) | 2016-06-23 |
EP3233331A2 (en) | 2017-10-25 |
WO2016096120A2 (en) | 2016-06-23 |
CN107206478B (en) | 2020-10-16 |
DE102014018798A1 (en) | 2016-06-23 |
WO2016096120A3 (en) | 2016-09-01 |
JP2018501112A (en) | 2018-01-18 |
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