EP2855051A1 - Delivery device for a metal melt in an injection press - Google Patents

Delivery device for a metal melt in an injection press

Info

Publication number
EP2855051A1
EP2855051A1 EP13731678.2A EP13731678A EP2855051A1 EP 2855051 A1 EP2855051 A1 EP 2855051A1 EP 13731678 A EP13731678 A EP 13731678A EP 2855051 A1 EP2855051 A1 EP 2855051A1
Authority
EP
European Patent Office
Prior art keywords
piston
molten metal
bore
filling
valve body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13731678.2A
Other languages
German (de)
French (fr)
Other versions
EP2855051B1 (en
Inventor
Johannes Konrad WUNDERLE
Andreas Neuss
Rainer Krallmann
Kerstin Krallmann
Ingo Brexeler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gebr Krallmann GmbH
Original Assignee
Gebr Krallmann GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gebr Krallmann GmbH filed Critical Gebr Krallmann GmbH
Priority to SI201330311A priority Critical patent/SI2855051T1/en
Publication of EP2855051A1 publication Critical patent/EP2855051A1/en
Application granted granted Critical
Publication of EP2855051B1 publication Critical patent/EP2855051B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/02—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by volume
    • 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
    • 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
    • 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
    • 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
    • B22D17/28—Melting pots
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • 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

Definitions

  • the invention relates to a conveying device for a molten metal in an injection pressure unit, for example, a metal casting machine, with a reservoir for the molten metal and a conveying channel in which the molten metal is fed to a mold cavity, wherein the conveying channel comprises a cylinder bore in which a piston is arranged axially adjustable, and wherein a collecting chamber for the molten metal is provided, from which the metal melt can be introduced into the mold cavity as a result of an axial displacement of the piston by a further line.
  • an injection pressure unit for example, 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 metal component corresponding to the mold cavity is formed.
  • the introduction of the molten metal can for example be done solely by gravity.
  • a generic conveying device for a molten metal with a piston which is axially adjustable in a cylinder bore.
  • the molten metal can be introduced by means of a rotary-driven screw conveyor, which is arranged perpendicular to the piston, through a lateral inlet bore in a cylinder bore formed in front of the piston collecting chamber and is then by an axial displacement of the piston in a further conveying line and from this in pressed a mold cavity.
  • This structure is structurally complex and requires a large amount of space.
  • the invention has for its object to provide a winningvor ⁇ direction for a molten metal in a Spritz horrinum example of a metal casting machine, which has a simple, compact structure and with which the molten metal with high cycle numbers in a mold cavity can be introduced.
  • the delivery channel comprises a cylinder bore in which a piston is arranged axially adjustable, and that a collection chamber is formed for the molten metal, from which the molten metal in Consequence of the axial displacement of the piston can be introduced by a further line in the mold cavity.
  • the collection chamber is preferably formed in the cylinder bore.
  • the invention is based on the basic principle to provide a predetermined amount of molten metal in the collection chamber and push out of this by a displacement of the piston and to transport over the continuing line in the mold cavity.
  • the piston then returns to its original position, during the return movement of the piston already new molten metal can flow into the collection chamber.
  • the movement of the piston is designed so that the collection chamber is already completely filled with inflowing molten metal, when the piston has reached its upper starting position, so that he can immediately perform his shift again, with the molten metal from the collection chamber through the continuing line is pressed into the mold cavity.
  • the molten metal can be introduced from the storage container via at least one filling bore into the collection chamber. While the piston moves back to its initial position, the molten metal flows through the preferably formed in the piston and particularly preferably the piston penetrating filling bore in the piston simultaneously released from the collection chamber. It has been shown that in this way a refilling of the collection chamber can be achieved very quickly and reliably.
  • a plurality of filling holes are provided, which are connected in parallel and thus ensure rapid filling of the collecting ⁇ chamber. The filling or filling holes are constantly during the return movement of the piston to its initial position with on the one hand the reservoir for the molten metal and on the other hand with the collection chamber in connection.
  • the filling bore can be closed at its end opening into the collecting chamber by means of a valve body. If a plurality of parallel filling holes are provided, a common valve body may be provided for this.
  • the valve body can be adjusted between a closed position, in which it prevents the flow of molten metal from the filling bore into the collecting chamber, and an open position, in which it can flow the molten metal from the filling bore or the filling bores into the collecting chamber.
  • an adjustable valve rod which is preferably provided with egg ⁇ nem drive, which is controlled by a control device.
  • valve rod is slidably disposed in an axial bore or a longitudinal center bore of the piston, whereby a very compact construction is provided.
  • the valve body and the valve stem can thus both together be moved with the piston within the cylinder bore and adjusted relative to the piston.
  • the seal between the piston and the cylinder bore is achieved in that the piston sits at least partially in tight fit in the piston.
  • the cross section of the valve body is smaller than the cross section of the cylinder bore, so that the molten metal can freely flow around the valve body within the cylinder bore.
  • a check valve is arranged in the secondary line, which may be, for example, a spring-loaded valve body.
  • Fig. 1 is a longitudinal section through an inventive
  • Fig. 2 is an enlarged view of the lower end of
  • FIG. 3 shows the piston in its lower position with the valve body in the open position.
  • a conveyor device 10 shown in Figure 1 has a housing 11 in which a vertical cylinder bore 12 is formed.
  • a reservoir 27 is set for a molten metal M, which encompasses a container housing 28 in which a container interior 29 is formed, which is filled with the molten metal M.
  • the molten metal M can be supplied to the container interior 29 in liquid form or be produced in it by melting, for example, a metal granulate.
  • the container interior 29 of the reservoir 27 is connected via at least one obliquely downwardly in the flow direction inclined inlet channel 18 with the cylinder bore 12 in connection.
  • a slag separator 30 effective as a filter is provided in the container interior 29.
  • a piston 13 is slidably inserted under close fit.
  • an annular space 17 is formed on the outer surface of the piston 13.
  • At the lower end of the annulus 17 more run over the circumference of the piston 13 arranged distributed filling holes 16 each to unte ⁇ ren face of the piston 13 (see Figure 2).
  • 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.
  • valve rod 19 can be adjusted by moving the valve rod 19 relative to the piston 13 between a closed position shown in Figure 2, in which the valve body 20 prevents leakage of molten metal from the filling holes 16, and an open position shown in Figure 3, in which the molten metal from the Fill holes 16 in an underlying, formed in the cylinder bore 12 collecting chamber 15 can flow.
  • the cross section of the valve body 20 is smaller than the cross section of the cylinder bore 12, so that the valve body 20 within the cylinder bore 12 has no sealing function and the molten metal M can freely flow around the valve body 20.
  • the cylinder bore 12 and the collecting chamber 15 formed in it is at the lower end via a continuing line
  • the continuing line 21 comprises a lower transverse bore 31, via which the collecting chamber 15 is connected to a vertical riser 22.
  • the riser 22 passes at its upper end in a substantially horizontally extending filling channel 23, from which the molten metal is supplied to the mold cavity, as indicated by the arrow F.
  • a check valve 24 is arranged, which has a valve body 25, the ner spring 26 is tensioned against the flow direction against a valve seat 32.
  • the piston 13 has reached its upper position, wherein the valve body 20 is in its closed position ( Figure 2) and prevents leakage of molten metal from the filling holes 16 in the collecting chambers 15.
  • the collecting chamber 15 is filled with molten metal M.
  • the piston 13 is then moved together with the valve rod 19 down, the valve body 20 remains in its closed position. Since the lower portion of the piston 13 is seated in a sealed manner in the cylinder bore 12 be ⁇ -sensitive in the collection chamber 15 the molten metal is pushed out from the collection chamber 15 and conveyed via the transverse bore 31 and the riser 22 to the check valve 24, which in result of the pressure against the force of the spring 26 is open.
  • the molten metal M can thus enter the filling channel 23 and is supplied to the mold cavity (arrow F).
  • the piston 13 has reached its lower position, the filling operation is completed and the movement of the piston 13 is reversed, that is, the piston 13 is moved upward.
  • the valve body 20 is brought into its open position by the valve rod 19 is displaced within the axial bore and the valve body 20 is lifted from the end face of the piston 13 (see Figure 3).
  • the annular space 17 is in any axial position of the piston 13, ie in the upper Position of the piston 13 according to Figure 2 and the lower position of the piston 13 according to Figure 3 and in each intermediate position on the inlet channel 18 with the Be Zellerin ⁇ nenraum 29 of the reservoir 27 in conjunction, so that the molten metal M constantly at the frontal outlet of the filling holes 16th pending.
  • the valve rod 19 is moved with the valve body 20 relative to the piston 13, whereby the valve body 20 comes into its open position.
  • the molten metal M flows from the reservoir 27 through the inlet channel 18, the annular space 17 and the filling holes 16 into the collecting chamber 15. Due to the method of the piston 13 may be set in the collection chamber 15 optionally a slight negative pressure. An intake or return of the metal melt M still in the riser 22 or the filling channel 23 is prevented by the non-return valve 24 closing.
  • valve body 20 When the piston has reached its upper position 13 and the collection chamber 15 is filled with the molten metal M, the valve body 20 is in its closed position procedural ⁇ reindeer, in which it interrupts the connection between the filling holes 16 and the plenum 15 °. At this moment, the starting position shown in Figure 1 is reached again, whereupon the piston 13 is moved back down and presses the molten metal M from the collection chamber 15 in the mold cavity (arrow F).

Abstract

A delivery device for a metal melt in an injection-moulding machine, for example a metal casting machine, has a storage container for the metal melt and a delivery channel in which the metal melt is fed to a mould cavity. In this case, provision is made for the delivery channel to comprise a cylindrical bore in which a piston is arranged in an axially adjustable manner. Provided for the metal melt is a collection chamber from which the metal melt is introduced into the mould cavity through a continuing line as a result of an axial displacement of the piston. Formed between the outer wall of the piston and the inner wall of the cylindrical bore is an annular space which is connected to the collecting chamber via at least one filling bore. At its end that opens into the collecting chamber, the filling bore is closable by means of a valve body which is connected to an adjustable valve rod which is arranged in a displaceable manner in an axial bore of the piston.

Description

Fördervorrichtung für eine Metallschmelze in einem  Delivery device for a molten metal in one
Spritzdruckaggregat  Spray pressure unit
Die Erfindung betrifft eine Fördervorrichtung für eine Metallschmelze in einem Spritzdruckaggregat beispielsweise einer Metallgussmaschine, 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 eine Sammelkammer für die Metallschmelze vorgesehen ist, aus der die Me- tallschmelze in Folge einer axialen Verschiebung des Kolbens durch eine weiterführende Leitung in den Formholraum einbringbar ist. The invention relates to a conveying device for a molten metal in an injection pressure unit, for example, a metal casting machine, with a reservoir for the molten metal and a conveying channel in which the molten metal is fed to a mold cavity, wherein the conveying channel comprises a cylinder bore in which a piston is arranged axially adjustable, and wherein a collecting chamber for the molten metal is provided, from which the metal melt can be introduced into the mold cavity as a result of an axial displacement of the piston by a further line.
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 metallenes Bauteil gebildet ist. Die Einbringung der Metallschmelze kann beispielsweise alleine in Folge der Schwerkraft erfolgen. 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 metal component corresponding to the mold cavity is formed. The introduction of the molten metal can for example be done solely by gravity.
BESTÄTIGUNGSKOPIE Es hat sich aber gezeigt, dass diese Einbringung der Metallschmelze in den Formhohlraum insbesondere bei Bauteilen, bei denen ein metallener Abschnitt an einen üblicherweise aus Kunststoff bestehenden Grundkörper angeformt wird, relativ langsam ist. Die Arbeitsgeschwindigkeit, d.h. die Anzahl der maximalen Arbeitstakte pro Zeiteinheit ist bei der Metallgussmaschine deshalb stark beschränkt. CONFIRMATION COPY However, it has been shown that this introduction of the molten metal into the mold cavity is relatively slow, in particular in the case of components in which a metal section is formed on a basic body, which is usually made of plastic. The working speed, ie the number of maximum work cycles per unit time is therefore very limited in the metal casting machine.
Aus der EP 1 046 445 Bl ist eine gattungsgemäße Fördervor- richtung für eine Metallschmelze mit einem Kolben bekannt, der in einer Zylinderbohrung axial verstellbar ist. Die Metallschmelze kann mittels eines drehangetriebenen Schneckenförderers, der senkrecht zum Kolben angeordnet ist, durch eine seitliche Zulaufbohrung in eine in der Zylinder- bohrung vor dem Kolben ausgebildete Sammelkammer eingebracht werden und wird dann durch eine axiale Verschiebung des Kolbens in eine weiterführende Förderleitung und aus dieser in einen Formhohlraum gedrückt. Dieser Aufbau ist konstruktiv aufwändig und benötigt einen großen Bauraum. From EP 1 046 445 B1 a generic conveying device for a molten metal with a piston is known, which is axially adjustable in a cylinder bore. The molten metal can be introduced by means of a rotary-driven screw conveyor, which is arranged perpendicular to the piston, through a lateral inlet bore in a cylinder bore formed in front of the piston collecting chamber and is then by an axial displacement of the piston in a further conveying line and from this in pressed a mold cavity. This structure is structurally complex and requires a large amount of space.
Der Erfindung liegt die Aufgabe zugrunde, eine Fördervor¬ richtung für eine Metallschmelze in einem Spritzdruckaggregat beispielsweise einer Metallgussmaschine zu schaffen, die einen einfachen, kompakten Aufbau besitzt und mit der die Metallschmelze mit hohen Taktzahlen in einen Formhohlraum einbringbar ist. The invention has for its object to provide a Fördervor ¬ direction for a molten metal in a Spritzdruckaggregat example of a metal casting machine, which has a simple, compact structure and with which the molten metal with high cycle numbers in a mold cavity can be introduced.
Diese Aufgabe wird erfindungsgemäß durch eine Fördervorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Dabei ist ebenfalls vorgesehen, dass der Förderkanal eine Zylinderbohrung umfasst, in der ein Kolben axial verstellbar an geordnet ist, und dass eine Sammelkammer für die Metallschmelze ausgebildet ist, aus der die Metallschmelze in Folge der Axialverschiebung des Kolbens durch eine weiterführende Leitung in den Formhohlraum einbringbar ist. Die Sammelkammer ist vorzugsweise in der Zylinderbohrung ausgebildet . This object is achieved by a conveyor device with the features of claim 1. It is also contemplated that the delivery channel comprises a cylinder bore in which a piston is arranged axially adjustable, and that a collection chamber is formed for the molten metal, from which the molten metal in Consequence of the axial displacement of the piston can be introduced by a further line in the mold cavity. The collection chamber is preferably formed in the cylinder bore.
Erfindungsgemäß wird von dem Grundprinzip ausgegangen, eine vorbestimmte Menge der Metallschmelze in der Sammelkammer bereitzustellen und aus dieser durch eine Verschiebung des Kolbens herauszudrücken und über die weiterführende Leitung in den Formhohlraum zu transportieren. Der Kolben kehrt anschließend in seine Ausgangslage zurück, wobei während der Rückkehrbewegung des Kolbens bereits neue Metallschmelze in die Sammelkammer einfließen kann. Vorzugsweise ist die Bewegung des Kolbens so ausgelegt, dass die Sammelkammer bereits vollständig mit nachfließender Metallschmelze gefüllt ist, wenn der Kolben seine obere Ausgangsposition erreicht hat, so dass er unverzüglich wieder seine Verschiebung ausführen kann, mit der die Metallschmelze aus der Sammelkammer durch die weiterführende Leitung in den Formhohlraum hineingedrückt wird. According to the invention, it is based on the basic principle to provide a predetermined amount of molten metal in the collection chamber and push out of this by a displacement of the piston and to transport over the continuing line in the mold cavity. The piston then returns to its original position, during the return movement of the piston already new molten metal can flow into the collection chamber. Preferably, the movement of the piston is designed so that the collection chamber is already completely filled with inflowing molten metal, when the piston has reached its upper starting position, so that he can immediately perform his shift again, with the molten metal from the collection chamber through the continuing line is pressed into the mold cavity.
Die Metallschmelze ist aus dem Vorratsbehälter, über zumindest eine Füllbohrung in die Sammelkammer einbringbar. Während der Kolben in seine Ausgangsstellung zurück fährt, läuft die Metallschmelze durch die vorzugsweise im Kolben ausgebildete und besonders vorzugsweise den Kolben durchdringende Füllbohrung in die vom Kolben gleichzeitig freigegebene Sammelkammer ein. Es hat sich gezeigt, dass auf diese Weise sehr schnell und in zuverlässiger Weise ein Nachfüllen der Sammelkammer erreicht werden kann. Vorzugsweise sind mehrere Füllbohrungen vorgesehen, die parallel geschaltet sind und somit eine schnelle Füllung der Sammel¬ kammer gewährleisten. Die Füllbohrung bzw. Füllbohrungen stehen während der Rückkehrbewegung des Kolbens in seine Ausgangsstellung ständig mit einerseits dem Vorratsbehälter für die Metallschmelze und andererseits mit der Sammelkammer in Verbindung. Dies wird erfindungsgemäß dadurch erreicht, dass zwischen der Außenwandung des Kolbens und der Innenwandung der Zylinderbohrung in einem vorbestimmten Abschnitt des Kolbens ein Ringraum gebildet ist und dass der Ringraum über die Füllbohrung bzw. Füllbohrungen mit der Sammelkammer in Verbindung steht. Zusätzlich wird der Ringraum aus dem Vorratsbehälter mit Metallschmelze gespeist. The molten metal can be introduced from the storage container via at least one filling bore into the collection chamber. While the piston moves back to its initial position, the molten metal flows through the preferably formed in the piston and particularly preferably the piston penetrating filling bore in the piston simultaneously released from the collection chamber. It has been shown that in this way a refilling of the collection chamber can be achieved very quickly and reliably. Preferably, a plurality of filling holes are provided, which are connected in parallel and thus ensure rapid filling of the collecting ¬ chamber. The filling or filling holes are constantly during the return movement of the piston to its initial position with on the one hand the reservoir for the molten metal and on the other hand with the collection chamber in connection. This is inventively achieved in that between the outer wall of the piston and the inner wall of the cylinder bore in a predetermined portion of the piston, an annular space is formed and that the annular space via the filling bore or filling holes communicates with the collection chamber. In addition, the annulus from the reservoir is fed with molten metal.
Um den Zufluss von Metallschmelze in die Sammelkammer steuern zu können, ist gemäß der Erfindung vorgesehen, dass die Füllbohrung an ihrem in der Sammelkammer mündenden Ende mittels eines Ventilkörpers verschließbar ist. Wenn mehrere parallel geschaltete Füllbohrungen vorgesehen sind, kann für diese ein gemeinsamer Ventilkörper vorgesehen sein. Der Ventilkörper kann zwischen einer Schließstellung, in der er die Strömung der Metallschmelze aus der Füllbohrung in die Sammelkammer unterbindet, und einer Offenstellung verstellt werden, in der er die Metallschmelze aus der Füllbohrung bzw. den Füllbohrungen in die Sammelkammer einströmen kann. Zur Verstellung des Ventil körpers ist dieser mit einer verstellbaren Ventilstange verbunden, die vorzugsweise mit ei¬ nem Antrieb versehen ist, der von einer Steuervorrichtung angesteuert wird. In order to be able to control the inflow of molten metal into the collecting chamber, it is provided according to the invention that the filling bore can be closed at its end opening into the collecting chamber by means of a valve body. If a plurality of parallel filling holes are provided, a common valve body may be provided for this. The valve body can be adjusted between a closed position, in which it prevents the flow of molten metal from the filling bore into the collecting chamber, and an open position, in which it can flow the molten metal from the filling bore or the filling bores into the collecting chamber. To adjust the valve body this is connected to an adjustable valve rod, which is preferably provided with egg ¬ nem drive, which is controlled by a control device.
Dabei ist die Ventilstange verschieblich in einer Axialbohrung bzw. einer Längsmittelbohrung des Kolbens angeordnet, wodurch ein sehr kompakter Aufbau gegeben ist. Der Ventilkörper und die Ventilstange können somit sowohl zusammen mit dem Kolben innerhalb der Zylinderbohrung verschoben als auch relativ zu den Kolben verstellt werden. In this case, the valve rod is slidably disposed in an axial bore or a longitudinal center bore of the piston, whereby a very compact construction is provided. The valve body and the valve stem can thus both together be moved with the piston within the cylinder bore and adjusted relative to the piston.
Die Abdichtung zwischen dem Kolben und der Zylinderbohrung wird dadurch erreicht, dass der Kolben zumindest abschnittsweise unter enger Passung in dem Kolben sitzt. The seal between the piston and the cylinder bore is achieved in that the piston sits at least partially in tight fit in the piston.
Vorzugsweise ist der Querschnitt des Ventilkörpers kleiner als der Querschnitt der Zylinderbohrung, so dass die Metallschmelze den Ventilkörper innerhalb der Zylinderbohrung frei umströmen kann. Preferably, the cross section of the valve body is smaller than the cross section of the cylinder bore, so that the molten metal can freely flow around the valve body within the cylinder bore.
Um ein Rückströmen der Metallschmelze aus der weiterführenden Leitung in die Sammelkammer zu vermeiden, ist in Weiterbildung der Erfindung vorgesehen, dass in der weiterführenden Leitung ein Rückschlagventil angeordnet ist, bei dem es sich beispielsweise um einen federbelasteten Ventilkörper handeln kann. In order to avoid a backflow of molten metal from the secondary line into the collecting chamber, it is provided in a further development of the invention that a check valve is arranged in the secondary line, which may be, for example, a spring-loaded valve body.
Weitere Einzelheiten und Merkmale der Erfindung sind aus der folgenden Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung ersichtlich. Es zeigen: Further details and features of the invention will become apparent from the following description of an embodiment with reference to the drawings. Show it:
Fig. 1 einen Längsschnitt durch eine erfindungsgemäße Fig. 1 is a longitudinal section through an inventive
Förder orrichtung;  Conveyor device;
Fig. 2 eine vergrößerte Darstellung des unteren Endes des Fig. 2 is an enlarged view of the lower end of
Kolbens mit dem Ventilkörper in der Schließstellung und  Piston with the valve body in the closed position and
Fig. 3 den Kolben in seiner unteren Position mit dem Ventilkörper in der Offenstellung. Eine in Figur 1 dargestellte Fördervorrichtung 10 besitzt ein Gehäuse 11, in dem eine vertikale Zylinderbohrung 12 ausgebildet ist. Fig. 3 shows the piston in its lower position with the valve body in the open position. A conveyor device 10 shown in Figure 1 has a housing 11 in which a vertical cylinder bore 12 is formed.
An das Gehäuse 11 ist ein Vorratsbehälter 27 für eine Metallschmelze M angesetzt, der ein Behältergehäuse 28 um- fasst, in dem ein Behälterinnenraum 29 ausgebildet ist, der mit der Metallschmelze M gefüllt ist. Die Metallschmelze M kann in flüssiger Form dem Behälterinnenraum 29 zugeführt oder in diesem durch Aufschmelzen beispielsweise eines Metall-Granulats erzeugt werden. To the housing 11, a reservoir 27 is set for a molten metal M, which encompasses a container housing 28 in which a container interior 29 is formed, which is filled with the molten metal M. The molten metal M can be supplied to the container interior 29 in liquid form or be produced in it by melting, for example, a metal granulate.
Der Behälterinnenraum 29 des Vorratsbehälters 27 steht über mindestens einen schräg nach unten in Strömungsrichtung geneigt verlaufende Zulaufkanal 18 mit der Zylinderbohrung 12 in Verbindung. Am Einlass des Zulaufkanals 18 ist in den Behälterinnenraum 29 ein als Filter wirksamer Schlackeabscheider 30 vorgesehen. The container interior 29 of the reservoir 27 is connected via at least one obliquely downwardly in the flow direction inclined inlet channel 18 with the cylinder bore 12 in connection. At the inlet of the inlet channel 18, a slag separator 30 effective as a filter is provided in the container interior 29.
In die Zylinderbohrung 12 ist ein Kolben 13 unter enger Passung verschieblich eingesetzt. In einem in der unteren Hälfte der axialen Länge des Kolbens 13 angeordneten Be¬ reich, der jedoch einen axialen Abstand vom unteren Ende des Kolbens 13 aufweist, ist auf der Außenoberfläche 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 jeweils zur unte¬ ren Stirnfläche des Kolbens 13 (siehe Figur 2). Derjenige Bereich des Kolbens 13, in den die Füllbohrungen 16 ausge¬ bildet sind, liegt in abgedichteter Weise an der Innenwan¬ dung der Zylinderbohrung 12 an. 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 VentilkörperIn the cylinder bore 12, a piston 13 is slidably inserted under close fit. In an arranged in the lower half of the axial length of the piston 13 Be ¬ rich, but having an axial distance from the lower end of the piston 13, an annular space 17 is formed on the outer surface of the piston 13. At the lower end of the annulus 17 more run over the circumference of the piston 13 arranged distributed filling holes 16 each to unte ¬ ren face of the piston 13 (see Figure 2). That portion of the piston 13, in which the filling holes are oriented ¬ forms 16, is located in a sealed manner at the Innenwan ¬ extension of the cylinder bore 12th 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 kann durch Verschieben der Ventilstange 19 relativ zum Kolben 13 zwischen einer in Figur 2 dargestellten Schließstellung, in der der Ventilkörper 20 ein Ausströmen von Metallschmelze aus den Füllbohrungen 16 verhindert, und einer in Figur 3 dargestellten Offenstellung verstellt werden, in der die Metallschmelze aus den Füllbohrungen 16 in eine darunterliegende, in der Zylinderbohrung 12 gebildete Sammelkammer 15 fließen kann. 20 can be adjusted by moving the valve rod 19 relative to the piston 13 between a closed position shown in Figure 2, in which the valve body 20 prevents leakage of molten metal from the filling holes 16, and an open position shown in Figure 3, in which the molten metal from the Fill holes 16 in an underlying, formed in the cylinder bore 12 collecting chamber 15 can flow.
Wie die Figuren 2 und 3 zeigen, ist der Querschnitt des Ventilkörpers 20 kleiner als der Querschnitt der Zylinderbohrung 12, so dass der Ventilkörper 20 innerhalb der Zylinderbohrung 12 keine Dichtfunktion hat und die Metallschmelze M den Ventilkörper 20 frei umströmen kann. As shown in FIGS. 2 and 3, the cross section of the valve body 20 is smaller than the cross section of the cylinder bore 12, so that the valve body 20 within the cylinder bore 12 has no sealing function and the molten metal M can freely flow around the valve body 20.
Die Zylinderbohrung 12 bzw. die in ihr gebildete Sammelkammer 15 ist am unteren Ende über eine weiterführende LeitungThe cylinder bore 12 and the collecting chamber 15 formed in it is at the lower end via a continuing line
21 mit einem nicht näher dargestellten Formhohlraum F verbunden. Die weiterführende Leitung 21 umfasst eine untere Querbohrung 31, über die die Sammelkammer 15 mit einer vertikalen Steigleitung 22 verbunden ist. Die Steigleitung 22 geht an ihrem oberen Ende in einen im Wesentlichen horizontal verlaufenden Füllkanal 23 über, aus dem die Metallschmelze dem Formhohlraum zugeführt wird, wie es 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 ei- ner Feder 26 entgegen der Strömungsrichtung gegen einen Ventilsitz 32 gespannt wird. 21 connected to a mold cavity F, not shown. The continuing line 21 comprises a lower transverse bore 31, via which the collecting chamber 15 is connected to a vertical riser 22. The riser 22 passes at its upper end in a substantially horizontally extending filling channel 23, from which the molten metal is supplied to the mold cavity, as indicated by the arrow F. In the transition between the riser 22 and the filling channel 23, a check valve 24 is arranged, which has a valve body 25, the ner spring 26 is tensioned against the flow direction against a valve seat 32.
Im Folgenden sollen die einzelnen Phasen der Einbringung der Metallschmelze M in dem Formhohlraum F erläutert werden . In the following, the individual phases of the introduction of the molten metal M in the mold cavity F will be explained.
Gemäß Figur 1 hat der Kolben 13 seine obere Position erreicht, wobei der Ventilkörper 20 sich in seiner Schließstellung befindet (Figur 2) und ein Ausströmen von Metallschmelze aus den Füllbohrungen 16 in die Sammelkämmer 15 verhindert. Die Sammelkammer 15 ist mit Metallschmelze M gefüllt. Der Kolben 13 wird dann zusammen mit der Ventilstange 19 nach unten verfahren, wobei der Ventilkörper 20 in seiner Schließstellung verbleibt. Da der untere Bereich des Kolbens 13 in abgedichteter Weise in der Zylinderbohrung 12 sitzt, wird die in der Sammelkammer 15 be¬ findliche Metallschmelze aus der Sammelkammer 15 herausgedrückt und über die Querbohrung 31 und die Steigleitung 22 zum Rückschlagventil 24 gefördert, das in Folge des Drucks entgegen der Kraft der Feder 26 offen ist. Die Metallschmelze M kann somit in den Füllkanal 23 eintreten und wird dem Formhohlraum zugeführt (Pfeil F) . Wenn der Kolben 13 seine untere Position erreicht hat, ist der Füllvorgang abgeschlossen und die Bewegung des Kolbens 13 wird umgekehrt, d.h. der Kolben 13 wird nach oben bewegt. Dabei wird zunächst der Ventilkörper 20 in seine Offenstellung gebracht, indem die Ventilstange 19 innerhalb der Axialbohrung verschoben und der Ventilkörper 20 von der Stirnseite des Kolbens 13 abgehoben wird (siehe Figur 3) . According to Figure 1, the piston 13 has reached its upper position, wherein the valve body 20 is in its closed position (Figure 2) and prevents leakage of molten metal from the filling holes 16 in the collecting chambers 15. The collecting chamber 15 is filled with molten metal M. The piston 13 is then moved together with the valve rod 19 down, the valve body 20 remains in its closed position. Since the lower portion of the piston 13 is seated in a sealed manner in the cylinder bore 12 be ¬-sensitive in the collection chamber 15 the molten metal is pushed out from the collection chamber 15 and conveyed via the transverse bore 31 and the riser 22 to the check valve 24, which in result of the pressure against the force of the spring 26 is open. The molten metal M can thus enter the filling channel 23 and is supplied to the mold cavity (arrow F). When the piston 13 has reached its lower position, the filling operation is completed and the movement of the piston 13 is reversed, that is, the piston 13 is moved upward. First, the valve body 20 is brought into its open position by the valve rod 19 is displaced within the axial bore and the valve body 20 is lifted from the end face of the piston 13 (see Figure 3).
Wie die Figuren 2 und 3 zeigen, steht der Ringraum 17 in jeder axialen Position des Kolbens 13, d.h. in der oberen Stellung des Kolbens 13 gemäß Figur 2 und der unteren Stellung des Kolbens 13 gemäß Figur 3 als auch in jeder Zwischenstellung über den Zulaufkanal 18 mit dem Behälterin¬ nenraum 29 des Vorratsbehälters 27 in Verbindung, so dass die Metallschmelze M ständig am stirnseitigen Auslass der Füllbohrungen 16 ansteht. As shown in Figures 2 and 3, the annular space 17 is in any axial position of the piston 13, ie in the upper Position of the piston 13 according to Figure 2 and the lower position of the piston 13 according to Figure 3 and in each intermediate position on the inlet channel 18 with the Behälterin ¬ nenraum 29 of the reservoir 27 in conjunction, so that the molten metal M constantly at the frontal outlet of the filling holes 16th pending.
Bevor oder mit dem Verstellen des Kolbens 13 aus seiner unteren Stellung wird die Ventilstange 19 mit dem Ventilkörper 20 relativ zum Kolben 13 verstellt, wodurch der Ventilkörper 20 in seine Offenstellung gelangt. Somit strömt während des Zurückziehens des Kolbens 13 in seine obere Stellung die Metallschmelze M aus dem Vorratsbehälter 27 durch den Zulaufkanal 18, den Ringraum 17 und die Füllbohrungen 16 in die Sammelkammer 15 ein. Aufgrund des Verfahrens des Kolbens 13 kann sich in der Sammelkammer 15 gegebenenfalls ein geringer Unterdruck einstellen. Ein Ansaugen oder Rückläufen der noch in der Steigleitung 22 oder dem Füllkanal 23 befindlichen Metallschmelze M ist dadurch verhindert, dass das Rückschlagventil 24 schließt. Before or with the adjustment of the piston 13 from its lower position, the valve rod 19 is moved with the valve body 20 relative to the piston 13, whereby the valve body 20 comes into its open position. Thus, during the retraction of the piston 13 to its upper position, the molten metal M flows from the reservoir 27 through the inlet channel 18, the annular space 17 and the filling holes 16 into the collecting chamber 15. Due to the method of the piston 13 may be set in the collection chamber 15 optionally a slight negative pressure. An intake or return of the metal melt M still in the riser 22 or the filling channel 23 is prevented by the non-return valve 24 closing.
Wenn der Kolben 13 seine obere Stellung erreicht hat und die Sammelkammer 15 mit der Metallschmelze M gefüllt ist, wird der Ventilkörper 20 in seine Schließstellung verfah¬ ren, in der er die Verbindung zwischen den Füllbohrungen 16 und der Sammelkammer 15 unterbricht. In diesem Augenblick ist wieder die in Figur 1 dargestellte Ausgangsposition erreicht, woraufhin der Kolben 13 wieder nach unten verfahren wird und die Metallschmelze M aus der Sammelkammer 15 in den Formhohlraum (Pfeil F) drückt. When the piston has reached its upper position 13 and the collection chamber 15 is filled with the molten metal M, the valve body 20 is in its closed position procedural ¬ reindeer, in which it interrupts the connection between the filling holes 16 and the plenum 15 °. At this moment, the starting position shown in Figure 1 is reached again, whereupon the piston 13 is moved back down and presses the molten metal M from the collection chamber 15 in the mold cavity (arrow F).

Claims

Patentansprüche claims
1. Fördervorrichtung für eine Metallschmelze (M) in einem Spritzdruckaggregat, mit einem Vorratsbehälter (27) für die Metallschmelze (M) und einem Förderkanal, in dem die Metallschmelze (M) einem Formhohlraum (F) zuführbar ist, wobei der Förderkanal eine Zylinderbohrung (12) umfasst, in der ein Kolben (13) axial verstellbar angeordnet ist, und wobei eine Sammelkammer (15) für die Metallschmelze (M) vorgesehen ist, aus der die Metallschmelze (M) in Folge einer axialen Verschiebung des Kolbens (13) durch eine weiterführende Leitung (21) in den Formhohlraum (F) einbringbar ist, dadurch gekenn¬ zeichnet, dass zwischen der Außenwandung des Kolbens (13) und der Innenwandung der Zylinderbohrung (12) ein Ringraum (17) gebildet ist, dass der Ringraum (17) über die zumindest eine Füllbohrung (16) mit der Sammelkam¬ mer (15) in Verbindung steht, dass die Füllbohrung (16) an ihrem in der Sammelkammer (15) mündenden Ende mittels eines Ventilkörpers (20) verschließbar ist, der mit einer verstellbaren Ventilstange (19) verbunden ist, und dass die Ventilstange (19) verschieblich in einer Axialbohrung (14) des Kolbens (13) angeordnet ist . 1. conveying device for a molten metal (M) in a injection pressure unit, with a reservoir (27) for the molten metal (M) and a conveying channel in which the molten metal (M) a mold cavity (F) can be fed, wherein the conveying channel a cylinder bore ( 12), in which a piston (13) is arranged axially adjustable, and wherein a collecting chamber (15) for the molten metal (M) is provided, from which the molten metal (M) as a result of axial displacement of the piston (13) a further line (21) in the mold cavity (F) can be introduced, characterized marked ¬ characterized in that between the outer wall of the piston (13) and the inner wall of the cylinder bore (12) an annular space (17) is formed, that the annular space (17 ) via the at least one filling bore (16) with the Sammelkam ¬ mer (15) is in communication that the filling bore (16) at its in the collection chamber (15) end opening by means of a valve body (20) is closable, the mi t an adjustable valve rod (19) is connected, and that the valve rod (19) slidably in an axial bore (14) of the piston (13) is arranged.
Fördervorrichtung nach Anspruch 1, dadurch gekennzeich net, dass die Sammelkämmer (15) in der Zylinderbohrung (12) ausgebildet ist. Conveyor device according to claim 1, characterized in that the collecting chambers (15) are formed in the cylinder bore (12).
Fördervorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zumindest eine Füllbohrung (16) den Kolben (13) durchdringt. Conveying device according to claim 1 or 2, characterized in that the at least one filling bore (16) penetrates the piston (13).
Fördervorrichtung nach einem der Ansprüche 1 bis 3, da durch gekennzeichnet, dass der Ringraum (17) über mehrere Füllbohrungen (16) mit der Sammelkammer (15) in Verbindung steht. Conveying device according to one of claims 1 to 3, characterized in that the annular space (17) via a plurality of filling bores (16) with the collecting chamber (15) is in communication.
Fördervorrichtung nach Anspruch 4, dadurch gekennzeich net, dass für alle Füllbohrungen (16) ein gemeinsamer Ventilkörper (20) vorgesehen ist. Conveying device according to claim 4, characterized in that a common valve body (20) is provided for all filling bores (16).
Fördervorrichtung nach einem der Ansprüche 1 bis 5, da durch gekennzeichnet, dass der Querschnitt des Ventilkörpers (20) kleiner als der Querschnitt der Zylinderbohrung (12) ist. Conveying device according to one of claims 1 to 5, characterized in that the cross section of the valve body (20) is smaller than the cross section of the cylinder bore (12).
Fördervorrichtung nach einem der Ansprüche 1 bis 6, da durch gekennzeichnet, dass in der weiterführenden Leitung (21) ein Rückschlagventil (24) angeordnet ist. Conveying device according to one of claims 1 to 6, characterized in that in the continuing line (21) a check valve (24) is arranged.
EP13731678.2A 2012-06-04 2013-05-31 Delivery device for a metal melt in an injection press Active EP2855051B1 (en)

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DE102012010923A DE102012010923A1 (en) 2012-06-04 2012-06-04 Delivery device for a molten metal in an injection pressure unit
PCT/EP2013/001601 WO2013182284A1 (en) 2012-06-04 2013-05-31 Delivery device for a metal melt in an injection press

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CA2874307C (en) 2020-07-28
CN104507599A (en) 2015-04-08
DE102012010923A1 (en) 2013-12-05
PT2855051T (en) 2016-10-06
EP2855051B1 (en) 2016-06-29
DK2855051T3 (en) 2016-10-10
HUE030363T2 (en) 2017-05-29
ES2593607T3 (en) 2016-12-12
SI2855051T1 (en) 2016-11-30
EA201492278A1 (en) 2015-03-31
PL2855051T3 (en) 2016-12-30
EA025480B1 (en) 2016-12-30
JP2015519204A (en) 2015-07-09
US20150151357A1 (en) 2015-06-04
WO2013182284A1 (en) 2013-12-12
US9676024B2 (en) 2017-06-13
CN104507599B (en) 2016-08-24
CA2874307A1 (en) 2013-12-12

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