EP0992306B1 - Low pressure bottom casting device for casting liquid metals - Google Patents
Low pressure bottom casting device for casting liquid metals Download PDFInfo
- Publication number
- EP0992306B1 EP0992306B1 EP99118748A EP99118748A EP0992306B1 EP 0992306 B1 EP0992306 B1 EP 0992306B1 EP 99118748 A EP99118748 A EP 99118748A EP 99118748 A EP99118748 A EP 99118748A EP 0992306 B1 EP0992306 B1 EP 0992306B1
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- EP
- European Patent Office
- Prior art keywords
- container
- holding furnace
- pressure
- melt
- casting
- 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.)
- Expired - Lifetime
Links
- 238000005266 casting Methods 0.000 title claims abstract description 44
- 229910001338 liquidmetal Inorganic materials 0.000 title 1
- 239000004576 sand Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000000155 melt Substances 0.000 abstract description 46
- 238000005058 metal casting Methods 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
Definitions
- the invention relates to a device for increasing Low-pressure casting of molten metal in intermittently pumped Sand molds with a arranged on the conveyor line Casting station, one arranged at this, the Molten metal containing gas pressure holding furnace with a connectable to the sand molds, rising pouring tube and a means for refilling the holding furnace with molten metal.
- the rising low-pressure casting has become particular in light metals, preferably aluminum, enforced.
- the reason is that light metal melts in air Oxidize very quickly and form unwanted oxide skin which significantly affects the quality of the casting. Therefore closed casting paths must be guaranteed be.
- air contact is inevitable, namely in the mold must be turbulent movements of the Melt be avoided.
- This succeeds in flawless Way only with the rising casting principle, in which the Melt from a gas-holding holding furnace is pressed into the mold.
- This casting principle has in particular advantages even if, as is increasingly the case, Sand molds are used because due to not or little turbulent melt flow dissolving Sand particles in the mold is avoided, which in turn Loss of quality on the finished casting entail would.
- the invention is based on the object, a device to create for the rising low pressure casting
- a high Casting capacity (To / h) allows.
- the means for Refill at least one pressure-tight melt container with a melt supply and a bottom drain and a filling tube arranged in the holding furnace with a has arranged outside of the same closure, that the melt container via its outlet with the filling tube the holding furnace pressure-tight can be coupled and that the Holding furnace with the melt container via a pneumatic Pressure equalization line is connected.
- a refill on the holding furnace attached which contains a melt supply and via a filling tube immersed in the holding furnace Melt delivers to the holding furnace.
- the handover of the Melt from the refill container in the holding furnace is without additional reduction of the gas pressure in the holding furnace possible because this with the refill connected via a pneumatic pressure equalization line which is the gas cushion in the holding furnace and in the Refill container brings into communicating connection.
- the coupling between the Outlet of the melt container and the filling tube of the holding furnace formed pressure-tight.
- the closure of the filling tube is preferably in dependence Controlled by the conveying cycle of the sand molds.
- the control can be done so that after each casting cycle the shutter is opened as long as that for the Fill the sand mold with necessary melt volume becomes. But the refill files can last longer and with each Nach Schollakt then a larger melt volume be transferred to the holding furnace. With this Operation in a pressure balanced state becomes the Filling dynamics when refilling the melt on the metallostatic Pressure difference limited because of the Casting cycle changing gas pressure in the furnace via the pressure equalization line always at the melt level in the refill container is pending, so that the gas pressure in the holding furnace is completely compensated.
- the Melt transferred in a closed system in the oven and can melt continuously and without Overflowing of air.
- the flow velocity in the filling tube can be by known measures reduce the desired level.
- the filling tube ends in the holding furnace near the ground, so that it is not in the holding furnace too turbulent melt movements come in Nach Heilllakt can.
- the Filling tube at the holding furnace gimbaled to the Coupling the bottom outlet of the melt container to the To facilitate holding furnace.
- a preferred variant of the invention is characterized characterized in that the melt container as a transport container formed with a closure at the bottom outlet and after emptying against a full transport container is interchangeable.
- the closures are at the bottom outlet and close the filling tube. Furthermore, the pressure equalization line from the container and then this can uncoupled and through a full melt container be replaced. This will be in the field of closures the filling tube coupled, the pressure equalization line connected and is then ready. The replacement can take place during the ongoing casting operation, so that the sand molds continue in the given Cycle time can be poured.
- the transport container before the Coupling to the filling tube and connecting the pressure compensation line is biased with gas pressure to at Coupling to avoid a pressure drop in the holding furnace and immediately after coupling with refilling to start from the melt container.
- the transport container is in one Caddy arranged by means of which he in recordings can be used at the holding furnace.
- the invention provides that the Melting container as a lock container between the Holding furnace and the stationary melting plant or the stationary melt supply arranged and a dip tube with a head-end closure outside the Melting container is refillable.
- Refilling can be done through an open pot, which is coupled via the closure to the dip tube, so that lock container and holding furnace turn as pressure-tight system can be operated with overpressure.
- lock container becomes depressurized at short notice and after transfer of the melt in the lock container this again pressurized.
- a transport route 1 e.g. in Shape of a roller conveyor indicated on the sand molds 2 by means of pallets 3 from the mold series in the casting station be transported.
- these are box-bound sand molds 2, that is consist of upper box 4 and lower box 5.
- a Pouring table 6 arranged on the sand molds 2 from the Conveyor 1 are deported. Instead, that can Of course, casting also takes place in the conveyor line 1.
- the melt 8th contains and can be raised and lowered, for example by means of a scissor lift 9.
- the scissor lift 9 or the holding furnace 7 on the scissor lift 9 additionally be moved translationally.
- the holding furnace 7 has on its one side Pouring tube 10, which is arranged rising, and in the Melt 8 immersed in the holding furnace 7.
- the riser opens via a closure 11 on the surface of the Casting table 6, where the sand mold 2, namely the lower box 5, is positionable with its sprue.
- melt container 14 fulfills the function of a transport container.
- This transport container contains a Melt supply 15, which run through a bottom outlet 16 can.
- the bottom outlet 16 is provided with a closure 17th equipped by means of which he to a filling tube 18, the immersed in the melt 8 of the holding furnace 7, connectable is.
- the filling tube 18 is gimbal at 19 on Holding furnace 7 stored and also with a controllable Provided closure 20, depending on Delivery cycle in the conveyor line 1 is controllable.
- the pressure-tight melt container 14, namely its Gas pressure pad 21 is connected via a pressure equalization line 22 with the gas pressure cushion 23 of the holding furnace 7th connected.
- the pressure equalization line 22 is in the range their connections to the melt container 14 and the Holding furnace 7 with suitable, controllable closures Mistake. Furthermore, another closure on the ceiling the melt container 14 is arranged.
- FIG. 1 another transport frame 13 'with a Melt container 14 'shown.
- This arrangement is in the same way as the previously described.
- the closure 17 'of the melt container 14' is located in closed position.
- the shutter 11 After positioning the sand mold 2 in the casting position the shutter 11 is opened and penetrates the melt under the pressure of the gas cushion 23 in the holding furnace. 7 through the riser 10 in the sand mold 2, until the Mold cavity is filled. Then the shutter 11 brought into the closed position and the sand mold 2 in the Conveyor 1 reset, on this by one position administrattaktet and the next sand mold in the Casting position brought. At every casting stroke or after one Plurality of castings becomes the seals 17 and 20 turned on and can melt 15 from the transport container 4 over the bottom outlet 16 and the filling pipe 18th be overcrowded in the holding furnace 7. this happens preferably between two casting cycles to the casting process not influenced by the filling dynamics. By the Pressure equalization line 22 ensures that the Gredynamik not by pressure differences in addition being affected. The flow rate of the melt 15 through the bottom outlet 16 and the filling tube 18 can kept low by suitable cross sections and installations become.
- melt container 14 If the melt container 14 emptied, it is closed Closure 17 of the closed closure 20 uncoupled and the pressure equalization line 22 and the corresponding closure 24 is closed on the melt container 14. Then, the melt container 14 by means of of the transport frame 13 removed from the receptacles 12 and exchanged with the melt container 14 '. If he is in position, he will be with his Closure 17 'coupled to the closure 20 of the filling tube 18, then the pressure equalization line 22nd connected and the closure 24 'on the melt container 14 'open. The refilling of the holding furnace 7 is done then in the manner already described.
- Fig. 2 shows a modified embodiment, wherein the same Components are designated by the same reference numerals.
- the melt container 14 is stationary Lock container 25 is formed, the bottom outlet 16 is coupled to the closure 20 of the filling tube 18.
- the pressure-tight lock container 25 is in turn on the Pressure equalization line 22 connected to the holding furnace 7.
- the lock container 25 is a dip tube 26th used, the head and outside the lock container 25 is provided with a closure 27.
- Crucible 28 coupled, consisting of a stationary melt supply is filled. This can be a Forehearth, a treatment furnace or the like act.
- the refilling of the holding furnace 7 is again via the controllable closure 20 and the filling tube 18 in the previously described manner. It is the head-side Closure 27 of the lock container 25 is closed. Between these refill files, the lock container 25 are refilled via the crucible 28. For this purpose, the Pressure in the lock container 25 relieved to the extent that the geodesic height between the crucible 28 and the remaining Melt level in the lock container 25 is sufficient to overflow the melt from the crucible 28 to enable. After this refilling the shutter 27 brought back into the closed position and the pressure compensation via the line 22 between lock container 25 and holding furnace 7 restored.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
- Die Bonding (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum steigenden Niederdruck-Gießen von Metallschmelze in taktweise geförderte Sandformen mit einer an der Förderstrecke angeordneten Gießstation, einem an dieser angeordneten, die Metallschmelze enthaltenden Gasdruck-Warmhalteofen mit einem an die Sandformen anschließbaren, steigenden Gießrohr und einer Einrichtung zum Nachfüllen des Warmhalteofens mit Metallschmelze.The invention relates to a device for increasing Low-pressure casting of molten metal in intermittently pumped Sand molds with a arranged on the conveyor line Casting station, one arranged at this, the Molten metal containing gas pressure holding furnace with a connectable to the sand molds, rising pouring tube and a means for refilling the holding furnace with molten metal.
Das steigende Niederdruck-Gießen hat sich insbesondere bei Leichtmetallen, vorzugsweise Aluminium, durchgesetzt. Der Grund liegt darin, daß Leichtmetallschmelzen an Luft sehr schnell oxidieren und unerwünschte Oxidhaut gebildet wird, die die Qualität des Gußstücks erheblich beeinflußt. Es müssen deshalb geschlossene Gießwege gewährleistet sein. Dort wo der Luftkontakt unvermeidlich ist, nämlich in der Gießform müssen turbulente Bewegungen der Schmelze vermieden werden. Dies gelingt in einwandfreier Weise nur mit dem steigenden Gießprinzip, bei der die Schmelze aus einem unter Gasdruck stehenden Warmhalteofen in die Form gedrückt wird. Dieses Gießprinzip hat insbesondere auch dann Vorteile, wenn, wie zunehmend der Fall, Sandformen eingesetzt werden, da aufgrund der nicht oder nur wenig turbulenten Schmelzeströmung das Lösen von Sandpartikeln in der Form vermieden wird, die wiederum Qualitätseinbußen am fertigen Gußstück nach sich ziehen würden.The rising low-pressure casting has become particular in light metals, preferably aluminum, enforced. The reason is that light metal melts in air Oxidize very quickly and form unwanted oxide skin which significantly affects the quality of the casting. Therefore closed casting paths must be guaranteed be. Where air contact is inevitable, namely in the mold must be turbulent movements of the Melt be avoided. This succeeds in flawless Way only with the rising casting principle, in which the Melt from a gas-holding holding furnace is pressed into the mold. This casting principle has in particular advantages even if, as is increasingly the case, Sand molds are used because due to not or little turbulent melt flow dissolving Sand particles in the mold is avoided, which in turn Loss of quality on the finished casting entail would.
Das aus der Eisen- und Stahlgießerei bekannte Gießen in Sandformen ist heute mit hohen Taktzeiten möglich, da -im Gegensatz zum Druckgießen- die Sandformen an der Gießstation nur solange angehalten werden müssen, wie dies für das Füllen der Form erforderlich ist, während der gesamte Abkühlprozeß und das Erstarren des Gußstücks auf einer anschließenden Kühlstrecke erfolgen kann. Im übrigen hat das Druckgießen Grenzen bei zunehmendem Gußgewicht. Umgekehrt ergeben sich beim Niederdruck-Gießen dadurch Probleme, daß herkömmliche Gasdruck-Warmhalteöfen, die stets nur eine bestimmte Schmelzemenge enthalten können, bei hoher Gießleistung im Bereich mehrerer Tonnen pro Stunde versagen und selbst bei kleineren Gießleistungen jedoch hohen Taktzeiten für das Nachfüllen der Schmelze zu viel Zeit benötigt wird. Während des Nachfüllens muß zudem der Formtransport stillgesetzt werden.The casting known from the iron and steel foundry in Sand molds is possible today with high cycle times because -im Contrary to die casting - the sand molds at the casting station only have to be stopped as long as this is for the filling of the mold is required while the entire Cooling process and the solidification of the casting on a subsequent cooling section can take place. Otherwise has the die casting limits with increasing casting weight. Conversely, this results in low-pressure casting Problems that conventional gas pressure holding furnaces, the always contain only a certain amount of melt, with high casting capacity in the range of several tons per Hour fail and even with smaller casting However, high cycle times for refilling the melt too much time is needed. During the refilling must In addition, the mold transport be shut down.
Beim fallenden Niederdruck-Gießen erfolgt das Nachfüllen des Schmelzebehälters mehr oder minder kontinuierlich über einen vorgeschalteten Schmelzetiegel mit einem in den Warmhalteofen hineingeführten Tauchrohr. Dies würde beim steigenden Gießen, bei dem die zu füllende Form oberhalb des Warmhalteofens angeordnet ist, zu einer geodätischen Höhe des Tiegels führen, die mit einer erheblichen Fallhöhe der Schmelze verbunden wäre. Damit wiederum steigt die Gefahr der Oxidbildung und erhöht sich die von der Schmelze aufgenommene Gasmenge, die wiederum die Gußqualität erheblich beeinträchtigen würden.When falling low-pressure casting refilling occurs the melt container more or less continuously via an upstream melting crucible with an in the holding furnace inserted immersion tube. This would in the rising casting, in which the shape to be filled is arranged above the holding furnace, to a geodesic height of the crucible lead with a considerable drop height of the melt would be connected. In order to In turn, the risk of oxide formation increases and increases the amount of gas absorbed by the melt, the would in turn significantly affect the casting quality.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung für das steigende Niederdruck-Gießen zu schaffen, die einerseits die Beibehaltung hoher Taktzeiten in der Förderstrecke der Sandformen, andererseits eine hohe Gießleistung (To/h) ermöglicht.The invention is based on the object, a device to create for the rising low pressure casting On the one hand the retention of high cycle times in the Conveyor line of sand molds, on the other hand, a high Casting capacity (To / h) allows.
Ausgehend von der eingangs genannten Vorrichtung wird diese Aufgabe dadurch gelöst, daß die Einrichtung zum Nachfüllen wenigstens einen druckdichten Schmelzebehälter mit einem Schmelzevorrat und einem bodenseitigen Ablauf und ein im Warmhalteofen angeordnetes Füllrohr mit einem außerhalb desselben angeordneten Verschluß aufweist, daß der Schmelzebehälter über seinen Ablauf mit dem Füllrohr des Warmhalteofens druckdicht kuppelbar ist und daß der Warmhalteofen mit dem Schmelzebehälter über eine pneumatische Druckausgleichsleitung verbunden ist.Starting from the device mentioned above This object is achieved in that the means for Refill at least one pressure-tight melt container with a melt supply and a bottom drain and a filling tube arranged in the holding furnace with a has arranged outside of the same closure, that the melt container via its outlet with the filling tube the holding furnace pressure-tight can be coupled and that the Holding furnace with the melt container via a pneumatic Pressure equalization line is connected.
Gemäß der Erfindung ist auf dem Warmhalteofen ein Nachfüllbehälter aufgesetzt, der einen Schmelzevorrat enthält und über ein in den Warmhalteofen tauchendes Füllrohr die Schmelze an den Warmhalteofen abgibt. Die Übergabe der Schmelze aus dem Nachfüllbehälter in den Warmhalteofen ist ohne zusätzliche Absenkung des Gasdrucks im Warmhalteofen dadurch möglich, daß dieser mit dem Nachfüllbehälter über eine pneumatische Druckausgleichsleitung verbunden ist, welche das Gaspolster im Warmhalteofen und im Nachfüllbehälter in kommunizierende Verbindung bringt. Aus dem gleichen Grund ist auch die Kupplung zwischen dem Auslauf des Schmelzebehälters und dem Füllrohr des Warmhalteofens druckdicht ausgebildet.According to the invention is a refill on the holding furnace attached, which contains a melt supply and via a filling tube immersed in the holding furnace Melt delivers to the holding furnace. The handover of the Melt from the refill container in the holding furnace is without additional reduction of the gas pressure in the holding furnace possible because this with the refill connected via a pneumatic pressure equalization line which is the gas cushion in the holding furnace and in the Refill container brings into communicating connection. For the same reason, the coupling between the Outlet of the melt container and the filling tube of the holding furnace formed pressure-tight.
Der Verschluß des Füllrohrs ist vorzugsweise in Abhängigkeit vom Fördertakt der Sandformen steuerbar.The closure of the filling tube is preferably in dependence Controlled by the conveying cycle of the sand molds.
Die Steuerung kann so erfolgen, daß nach jedem Gießtakt der Verschluß solange geöffnet wird, daß das für das Füllen der Sandform notwendige Schmelzevolumen nachgefüllt wird. Es können aber die Nachfülltakte auch länger und mit jedem Nachfülltakt dann ein größeres Schmelzevolumen in den Warmhalteofen überführt werden. Mit diesem Betrieb in einem druckausgeglichenen Zustand wird die Fülldynamik beim Nachfüllen der Schmelze auf den metallostatischen Druckunterschied begrenzt, da der im Gießtakt sich ändernde Gasdruck im Ofen über die Druckausgleichsleitung stets auch am Schmelzespiegel im Nachfüllbehälter ansteht, so daß der Gasdruck im Warmhalteofen vollständig kompensiert wird. Im Gegensatz zum Füllen über Tiegel bei gleicher geodätischer Höhe wird bei der erfindungsgemäß ausgebildeten Vorrichtung die Schmelze in einem geschlossenen System in den Ofen überführt und kann die Schmelze kontinuierlich und ohne Ansaugen von Luft überlaufen. Die Strömungsgeschwindigkeit im Füllrohr läßt sich durch bekannte Maßnahmen auf das gewünschte Maß reduzieren.The control can be done so that after each casting cycle the shutter is opened as long as that for the Fill the sand mold with necessary melt volume becomes. But the refill files can last longer and with each Nachfüllakt then a larger melt volume be transferred to the holding furnace. With this Operation in a pressure balanced state becomes the Filling dynamics when refilling the melt on the metallostatic Pressure difference limited because of the Casting cycle changing gas pressure in the furnace via the pressure equalization line always at the melt level in the refill container is pending, so that the gas pressure in the holding furnace is completely compensated. In contrast to Fill over crucible at the same geodetic height is in the inventively designed device the Melt transferred in a closed system in the oven and can melt continuously and without Overflowing of air. The flow velocity in the filling tube can be by known measures reduce the desired level.
Vorteilhafterweise endet das Füllrohr im Warmhalteofen bodennah, so daß es auch im Warmhalteofen nicht zu turbulenten Schmelzebewegungen beim Nachfülltakt kommen kann.Advantageously, the filling tube ends in the holding furnace near the ground, so that it is not in the holding furnace too turbulent melt movements come in Nachfüllakt can.
In einer weiterhin vorteilhaften Ausführung ist das Füllrohr am Warmhalteofen kardanisch gelagert, um das Ankuppeln des Bodenauslaufs des Schmelzebehälters an den Warmhalteofen zu erleichtern.In a further advantageous embodiment, the Filling tube at the holding furnace gimbaled to the Coupling the bottom outlet of the melt container to the To facilitate holding furnace.
Eine bevorzugte Variante der Erfindung zeichnet sich dadurch aus, daß der Schmelzebehälter als Transportbehälter mit einem Verschluß am Bodenauslauf ausgebildet und nach dem Entleeren gegen einen vollen Transportbehälter auswechselbar ist.A preferred variant of the invention is characterized characterized in that the melt container as a transport container formed with a closure at the bottom outlet and after emptying against a full transport container is interchangeable.
Für das Auswechseln sind die Verschlüsse am Bodenauslauf und am Füllrohr zu schließen. Ferner ist die Druckausgleichsleitung vom Behälter zu lösen und kann dieser dann abgekuppelt und durch einen vollen Schmelzebehälter ersetzt werden. Dieser wird im Bereich der Verschlüsse an das Füllrohr angekuppelt, die Druckausgleichsleitung angeschlossen und ist alsdann betriebsbereit. Das Auswechseln kann während des laufenden Gießbetriebs erfolgen, so daß die Sandformen weiterhin in der vorgegebenen Taktzeit abgegossen werden können.For replacement, the closures are at the bottom outlet and close the filling tube. Furthermore, the pressure equalization line from the container and then this can uncoupled and through a full melt container be replaced. This will be in the field of closures the filling tube coupled, the pressure equalization line connected and is then ready. The replacement can take place during the ongoing casting operation, so that the sand molds continue in the given Cycle time can be poured.
Dabei ist von Vorteil, wenn der Transportbehälter vor dem Ankuppeln an das Füllrohr und dem Anschließen der Druckausgleichsleitung mit Gasdruck vorgespannt wird, um beim Ankuppeln eine Druckabsenkung im Warmhalteofen zu vermeiden und unverzüglich nach dem Ankuppeln mit dem Nachfüllen aus dem Schmelzebehälter beginnen zu können.It is advantageous if the transport container before the Coupling to the filling tube and connecting the pressure compensation line is biased with gas pressure to at Coupling to avoid a pressure drop in the holding furnace and immediately after coupling with refilling to start from the melt container.
Zweckmäßigerweise ist der Transportbehälter in einem Transportgestell angeordnet, mittels dessen er in Aufnahmen am Warmhalteofen einsetzbar ist.Conveniently, the transport container is in one Caddy arranged by means of which he in recordings can be used at the holding furnace.
Damit ist ein schnelles und einfaches Positionieren des Nachfüllbehälters in der Kupplungslage am Warmhalteofen gewährleistet, so daß der Zeitbedarf für den Auswechselvorgang gering ist und in Verbindung mit den vorgenannten Merkmalen jeglicher Luftzutritt in das Schmelzesystem vermieden wird. Fluchtfehler in der Kupplungslage können in einfacher Weise durch die kardanische Lagerung des Füllrohrs am Warmhalteofen ausgeglichen werden.This is a quick and easy positioning of the Refill container in the coupling position on the holding furnace guaranteed, so that the time required for the replacement process is low and in conjunction with the aforementioned Features of any access of air into the melt system is avoided. Escape errors in the clutch position can in a simple way by the gimbal of the storage Füllrohrs be compensated at the holding furnace.
Für hohe Gießleistungen bis zu mehreren Tonnen pro Stunde wird man in der Regel einen größeren stationären Schmelzevorrat, beispielsweise in einem Vorherd oder in einem Behandlungsofen bereit halten, da bei solchen Gießleistungen der Austauch der Nachfüllbehälter nicht mehr in ausreichend kurzer Zeit möglich ist bzw. sich durch den dann notwendigen häufigen Austausch aufwendig gestaltet. Für einen solchen Fall sieht die Erfindung vor, daß der Schmelzebehälter als Schleusenbehälter zwischen dem Warmhalteofen und der stationären Schmelzanlage oder dem stationären Schmelzevorrat angeordnet und über ein Tauchrohr mit einem kopfseitigen Verschluß außerhalb des Schmelzebehälters nachfüllbar ist.For high casting capacities up to several tons per hour you will usually have a larger stationary melt stock, for example, in a forehearth or in a Keep the treatment oven ready, as with such casting services the replacement of the refill container is no longer possible sufficiently short time is possible or through the then necessary frequent replacement elaborately designed. For such a case, the invention provides that the Melting container as a lock container between the Holding furnace and the stationary melting plant or the stationary melt supply arranged and a dip tube with a head-end closure outside the Melting container is refillable.
Das Nachfüllen kann über einen offenen Tiegel geschehen, der über den Verschluß an das Tauchrohr angekuppelt ist, so daß Schleusenbehälter und Warmhalteofen wiederum als druckdichtes System mit Überdruck betrieben werden können. In den Nachfüllzyklen wird der Schleusenbehälter kurzfristig druckentlastet und nach Übergabe der Schmelze in den Schleusenbehälter dieser wieder unter Druck gesetzt.Refilling can be done through an open pot, which is coupled via the closure to the dip tube, so that lock container and holding furnace turn as pressure-tight system can be operated with overpressure. In refilling cycles the lock container becomes depressurized at short notice and after transfer of the melt in the lock container this again pressurized.
Nachstehend ist die Erfindung anhand von zwei in der Zeichnung wiedergegebenen Ausführungsbeispielen beschrieben. In der Zeichnung zeigen:
- Fig. 1
- eine schematische Ansicht der Vorrichtung in einer ersten Ausführungsform;
- Fig. 2
- eine der Fig. 1 ähnliche Ansicht einer zweiten Ausführungsform.
- Fig. 1
- a schematic view of the device in a first embodiment;
- Fig. 2
- one of the Fig. 1 similar view of a second embodiment.
In den Fig. 1 und 2 ist eine Transportstrecke 1, z.B. in
Form einer Rollenbahn angedeutet, auf der die Sandformen
2 mittels Paletten 3 aus der Formreihe in die Gießstation
transportiert werden. Beim gezeigten Ausführungsbeispiel
handelt es sich um kastengebundene Sandformen 2, die also
aus Oberkasten 4 und Unterkasten 5 bestehen. Bei dem
gezeigten Ausführungsbeispiel ist an der Gießstation ein
Gießtisch 6 angeordnet, auf den die Sandformen 2 aus der
Förderstrecke 1 abgeschoben werden. Stattdessen kann das
Abgießen natürlich auch in der Förderstrecke 1 erfolgen.In Figs. 1 and 2, a transport route 1, e.g. in
Shape of a roller conveyor indicated on the
An der Gießstation ist ein Warmhalteofen 7 unterhalb und
neben dem Gießtisch 6 angeordnet, der die Schmelze 8
enthält und heb- und senkbar ist, beispielsweise mittels
eines Scherenhubtischs 9. Gegebenenfalls kann der Scherenhubtisch
9 oder der Warmhalteofen 7 auf dem Scherenhubtisch
9 zusätzlich translatorisch verfahren werden.At the casting station is a holding furnace 7 below and
arranged next to the casting table 6, the melt 8th
contains and can be raised and lowered, for example by means of
a
Der Warmhalteofen 7 weist an seiner einen Seite ein
Gießrohr 10 auf, das steigend angeordnet ist, und in die
Schmelze 8 im Warmhalteofen 7 eintaucht. Das Steigrohr
mündet über einen Verschluß 11 an der Oberfläche des
Gießtischs 6, wo die Sandform 2, nämlich der Unterkasten
5, mit seinem Einguß positionierbar ist.The holding furnace 7 has on its one side
Pouring tube 10, which is arranged rising, and in the
Melt 8 immersed in the holding furnace 7. The riser
opens via a
Am Warmhalteofen 7 ist eine Aufnahme 12 für ein Transportgestell
13 angeordnet, der einen druckdichten Schmelzebehälter
14 aufnimmt. Bei diesem Ausführungsbeispiel
erfüllt der Schmelzebehälter 14 die Funktion eines Transportbehälters.
Dieser Transportbehälter enthält einen
Schmelzevorrat 15, der über einen Bodenauslauf 16 ablaufen
kann. Der Bodenauslauf 16 ist mit einem Verschluß 17
ausgestattet, mittels dessen er an ein Füllrohr 18, das
in die Schmelze 8 des Warmhalteofens 7 eintaucht, anschließbar
ist. Das Füllrohr 18 ist bei 19 kardanisch am
Warmhalteofen 7 gelagert und gleichfalls mit einem steuerbaren
Verschluß 20 versehen, der in Abhängigkeit vom
Fördertakt in der Förderstrecke 1 steuerbar ist.At the holding furnace 7 is a
Der druckdichte Schmelzebehälter 14, nämlich dessen
Gasdruckpolster 21 ist über eine Druckausgleichsleitung
22 mit dem Gasdruckpolster 23 des Warmhalteofens 7
verbunden. Die Druckausgleichsleitung 22 ist im Bereich
ihrer Anschlüsse an den Schmelzebehälter 14 und den
Warmhalteofen 7 mit geeigneten, steuerbaren Verschlüssen
versehen. Ferner ist ein weiterer Verschluß an der Decke
des Schmelzebehälters 14 angeordnet.The pressure-
In Fig. 1 ist ein weiteres Transportgestell 13' mit einem
Schmelzebehälter 14' gezeigt. Diese Anordnung ist in
gleicher Weise ausgebildet wie die zuvor Beschriebene.
Der Verschluß 17' des Schmelzebehälters 14' befindet sich
in Schließstellung. Ferner ist der Schmelzebehälter 14'
über den verschließbaren Anschluß 24' mittels Druckgas
vorgespannt, so daß im Raum 21' etwa der gleiche Druck
herrscht wie ihn das Gaspolster 21 in dem in Nachfüllposition
befindlichen Schmelzebehälter 24 aufweist.In Fig. 1, another transport frame 13 'with a
Melt container 14 'shown. This arrangement is in
the same way as the previously described.
The closure 17 'of the melt container 14' is located
in closed position. Furthermore, the melt container 14 '
via the closable connection 24 'by means of compressed gas
biased so that in space 21 'about the same pressure
like him the
Nach Positionieren der Sandform 2 in der Gießposition
wird der Verschluß 11 geöffnet und dringt die Schmelze
unter dem Druck des Gaspolsters 23 im Warmhalteofen 7
durch das Steigrohr 10 in die Sandform 2 ein, bis der
Formhohlraum gefüllt ist. Daraufhin wird der Verschluß 11
in Schließstellung gebracht und die Sandform 2 in die
Förderstrecke 1 zurückgesetzt, auf dieser um eine Position
weitergetaktet und die nächste Sandform in die
Gießposition gebracht. Bei jedem Gießtakt oder nach einer
Mehrzahl von Gießtakten werden die Verschlüsse 17 und 20
aufgesteuert und kann die Schmelze 15 aus dem Transportbehälter
4 über den Bodenauslauf 16 und das Füllrohr 18
in den Warmhalteofen 7 überfüllt werden. Dies geschieht
vorzugsweise zwischen zwei Gießtakten, um den Gießvorgang
nicht durch die Fülldynamik zu beeinflussen. Durch die
Druckausgleichsleitung 22 ist gewährleistet, daß die
Fülldynamik nicht durch Druckdifferenzen zusätzlich
beeinflußt wird. Die Ablaufgeschwindigkeit der Schmelze
15 durch den Bodenauslauf 16 und das Füllrohr 18 kann
durch geeignete Querschnitte und Einbauten gering gehalten
werden.After positioning the
Ist der Schmelzebehälter 14 geleert, wird er bei geschlossenem
Verschluß 17 von dem geschlossenen Verschluß
20 abgekuppelt und die Druckausgleichsleitung 22 bzw. der
entsprechende Verschluß 24 am Schmelzebehälter 14 geschlossen.
Daraufhin kann der Schmelzebehälter 14 mittels
des Transportgestells 13 aus den Aufnahmen 12 entnommen
und gegen den Schmelzebehälter 14' ausgetauscht werden.
Befindet sich dieser in Position, wird er mit seinem
Verschluß 17' an den Verschluß 20 des Füllrohrs 18 angekuppelt,
anschließend die Druckausgleichsleitung 22
angeschlossen und der Verschluß 24' am Schmelzebehälter
14' geöffnet. Das Nachfüllen des Warmhalteofens 7 geschieht
dann in der bereits beschriebenen Weise.If the
Fig. 2 zeigt eine abgewandelte Ausführung, wobei gleiche
Bauteile mit gleichen Bezugszeichen bezeichnet sind. In
diesem Fall ist der Schmelzebehälter 14 als stationärer
Schleusenbehälter 25 ausgebildet, dessen Bodenauslauf 16
an den Verschluß 20 des Füllrohrs 18 angekuppelt ist. Der
druckdichte Schleusenbehälter 25 ist wiederum über die
Druckausgleichsleitung 22 mit dem Warmhalteofen 7 verbunden.
In den Schleusenbehälter 25 ist ein Tauchrohr 26
eingesetzt, das kopfseitig und außerhalb des Schleusenbehälters
25 mit einem Verschluß 27 versehen ist. An diesem
wiederum ist beim gezeigten Ausführungsbeispiel ein
Tiegel 28 angekuppelt, der aus einem stationären Schmelzevorrat
gefüllt wird. Hierbei kann es sich um einen
Vorherd, einem Behandlungsofen oder dergleichen handeln.Fig. 2 shows a modified embodiment, wherein the same
Components are designated by the same reference numerals. In
In this case, the
Das Nachfüllen des Warmhalteofens 7 erfolgt wiederum über
den steuerbaren Verschluß 20 und das Füllrohr 18 in der
zuvor beschriebenen Weise. Dabei ist der kopfseitige
Verschluß 27 des Schleusenbehälters 25 geschlossen.
Zwischen diesen Nachfülltakten kann der Schleusenbehälter
25 über den Tiegel 28 nachgefüllt werden. Hierzu wird der
Druck im Schleusenbehälter 25 soweit entlastet, daß die
geodätische Höhe zwischen dem Tiegel 28 und dem verbliebenen
Schmelzeniveau im Schleusenbehälter 25 ausreicht,
um das Überlaufen der Schmelze aus dem Tiegel 28 zu
ermöglichen. Nach diesem Nachfüllvorgang wird der Verschluß
27 wieder in Schließlage gebracht und der Druckausgleich
über die Leitung 22 zwischen Schleusenbehälter
25 und Warmhalteofen 7 wieder hergestellt.The refilling of the holding furnace 7 is again via
the
Claims (8)
- Device for low pressure bottom casting of molten metal in cyclically conveyed sand moulds (2) with a casting station (6) located on the conveyor (1), a gas pressure holding furnace (7) containing the molten metal (8) and located on the casting station (6) with a bottom casting pipe (10) connectable to the sand moulds (2) and with a mechanism for refilling the holding furnace with molten metal, characterized in that the refilling mechanism has at least one pressure-tight molten metal container (14) and a filling pipe (18) located in the holding furnace (7) with a closure (20) located outside the latter, that the molten metal container can be coupled in pressure-tight manner to the filling pipe (18) of the holding furnace (7) by means of its outlet (16) and that the holding furnace (7) is connected to the molten metal container (14) by means of a pneumatic pressure compensating line (22).
- Device according to claim 1, characterized in that the closure (20) of the filling pipe (18) is controllable as a function of the conveying cycle of the sand moulds (2).
- Device according to claim 1 or 2, characterized in that the filling pipe (18) terminates in the vicinity of the bottom of the holding furnace (7).
- Device according to one of the claims 1 to 3, characterized in that the filling pipe (18) is gimbal-mounted (11) on the holding furnace (7).
- Device according to one of the claims 1 to 4, characterized in that the molten metal container (14) is constructed as a transportation container with a closure (17) at the bottom outlet (16) and after emptying can be replaced by a full transportation container (14).
- Device according to claim 5, characterized in that prior to the coupling to the filling pipe (18) and the connection of the pressure compensating line (22), the transportation container (14) is pretensioned with gas pressure.
- Device according to claims 5 and 6, characterized in that the transportation container (14) is placed in a transportation frame (13) and by means thereof can be inserted in receptacles (12) on the holding furnace (7).
- Device according to one of the claims 1 to 4, characterized in that the molten metal container (14) is placed as a lock container (25) between the holding furnace (7) and a stationary melting plant (28) or a stationary molten metal supply and is refillable by means of a dip pipe with a top-side closure (27) outside the lock container (25).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19845389A DE19845389A1 (en) | 1998-10-02 | 1998-10-02 | Device for increasing low-pressure casting of molten metals |
| DE19845389 | 1998-10-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0992306A1 EP0992306A1 (en) | 2000-04-12 |
| EP0992306B1 true EP0992306B1 (en) | 2003-11-12 |
Family
ID=7883175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99118748A Expired - Lifetime EP0992306B1 (en) | 1998-10-02 | 1999-09-23 | Low pressure bottom casting device for casting liquid metals |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6460604B1 (en) |
| EP (1) | EP0992306B1 (en) |
| JP (1) | JP2000107851A (en) |
| AT (1) | ATE253995T1 (en) |
| DE (2) | DE19845389A1 (en) |
| ES (1) | ES2207097T3 (en) |
| PT (1) | PT992306E (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001502A (en) * | 2016-07-07 | 2016-10-12 | 上海华培动力科技有限公司 | Flat-top low-pressure casting machine |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10033625A1 (en) * | 2000-07-11 | 2002-01-31 | Vaw Ver Aluminium Werke Ag | Method and device for rising casting with a mold / core package with an open gate |
| DE102004040147A1 (en) * | 2004-08-19 | 2006-02-23 | Rautenbach-Guß Wernigerode GmbH | Process to cast lightweight aluminium alloy components with a rising supply of molten metal |
| AT511300B1 (en) | 2011-02-09 | 2019-03-15 | Fill Gmbh | CASTING METHOD AND CASTING MACHINE FOR THE PRODUCTION OF WORKPIECES |
| CN107042296A (en) * | 2017-06-13 | 2017-08-15 | 江苏天宏机械工业有限公司 | A kind of two Room holding furnaces of use bridging lifting |
| CN109773154B (en) * | 2019-03-29 | 2023-11-03 | 中信戴卡股份有限公司 | Liquid leakage detection device of die casting machine |
| CN110918940B (en) * | 2019-12-18 | 2021-12-31 | 内蒙古工业大学 | Casting device and casting method for large-scale non-ferrous metal thin-wall structural part |
| CN111182752B (en) * | 2019-12-30 | 2021-04-13 | 贵州新蓝辉金属制品有限公司 | Radiator case for magnetic suspension train and casting method thereof |
| IT202100031076A1 (en) * | 2021-12-10 | 2023-06-10 | Paolo Zolesi | METHOD FOR MANUFACTURING A PART IN LIGHT ALLOY BY MELTING LIGHT ALLOY AT LOW PRESSURE AND EQUIPMENT TO CARRY OUT SUCH METHOD |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR902463A (en) * | 1943-04-01 | 1945-08-31 | Mahle Werk Gmbh | Machine for injection molding powered by compressed gas with discharge chamber placed outside the melting crucible |
| FR2293275A1 (en) * | 1974-12-06 | 1976-07-02 | Pechiney Aluminium | Device feeding furnaces of die-casting machines - enables uninterrupted casting and degassing in holding furnace |
| BG22157A1 (en) * | 1975-10-27 | 1977-05-20 | ||
| US4153100A (en) * | 1975-10-27 | 1979-05-08 | Institut Po Metaloznanie I Technologia Na Metalite | Low-pressure or counterpressure casting apparatus |
| DE3024709A1 (en) * | 1980-06-30 | 1982-01-28 | Leybold-Heraeus GmbH, 5000 Köln | Transport and storage container for metal melts - comprising ceramic lined metal cylinder with resistance heating elements intermediate the lining |
| SE455577B (en) * | 1980-06-30 | 1988-07-25 | Leybold Ag | PLANT FOR MANUFACTURE OF METAL POWDER INCLUDING AN INTERNAL ANCHOR |
| DE8230594U1 (en) * | 1982-10-30 | 1983-03-17 | Krupp Stahl Ag, 4630 Bochum | TRANSPORTABLE PAN FOR TAKING UP AND METALLURGICAL TREATMENT OF LIQUID METAL |
| DE3317474A1 (en) * | 1983-05-13 | 1984-11-15 | Russ-Elektroofen Produktions-Gesellschaft mbH & Co KG, 5000 Köln | LOW-PRESSURE CASTING METHOD AND DEVICE FOR ITS IMPLEMENTATION |
| US5271539A (en) * | 1986-06-09 | 1993-12-21 | Kawasaki Steel Corporation | Pressure type automatic pouring furnace for casting |
| DE4116998A1 (en) * | 1991-05-24 | 1992-11-26 | Ats Beteiligungs Gmbh | Die casting magnesium parts - using syphon-like tubes to maintain equal melt levels in area below mould, casting furnace and melting furnace |
| DE4139743A1 (en) * | 1991-12-03 | 1993-06-09 | Blacha, Jerzy Marcisz Von, Dipl.-Ing. | Measuring-out device for molten non-ferrous metals - with separate measuring-out chamber and melt warming bath |
| DE4203193C2 (en) * | 1992-02-05 | 1999-09-30 | Inst Werkstoffkunde Uni Hannov | Method and device for handling magnesium and magnesium alloy melts |
| JP3117163B2 (en) * | 1992-06-10 | 2000-12-11 | 東洋機械金属株式会社 | Die casting machine |
| DE4403285A1 (en) * | 1994-01-31 | 1995-08-03 | Alexander Fischer | Dosing furnace used in metallurgy |
| JP3354277B2 (en) * | 1994-03-23 | 2002-12-09 | マツダ株式会社 | Low pressure casting equipment |
| US5948352A (en) * | 1996-12-05 | 1999-09-07 | General Motors Corporation | Two-chamber furnace for countergravity casting |
| DE19720057A1 (en) * | 1997-05-14 | 1998-11-19 | Wagner Heinrich Sinto Masch | Method and device for increasing pouring in sand molds |
-
1998
- 1998-10-02 DE DE19845389A patent/DE19845389A1/en not_active Withdrawn
-
1999
- 1999-09-23 ES ES99118748T patent/ES2207097T3/en not_active Expired - Lifetime
- 1999-09-23 DE DE59907701T patent/DE59907701D1/en not_active Expired - Lifetime
- 1999-09-23 PT PT99118748T patent/PT992306E/en unknown
- 1999-09-23 EP EP99118748A patent/EP0992306B1/en not_active Expired - Lifetime
- 1999-09-23 AT AT99118748T patent/ATE253995T1/en not_active IP Right Cessation
- 1999-10-01 JP JP11281223A patent/JP2000107851A/en active Pending
- 1999-10-04 US US09/410,630 patent/US6460604B1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001502A (en) * | 2016-07-07 | 2016-10-12 | 上海华培动力科技有限公司 | Flat-top low-pressure casting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000107851A (en) | 2000-04-18 |
| EP0992306A1 (en) | 2000-04-12 |
| ES2207097T3 (en) | 2004-05-16 |
| ATE253995T1 (en) | 2003-11-15 |
| PT992306E (en) | 2004-03-31 |
| US6460604B1 (en) | 2002-10-08 |
| DE59907701D1 (en) | 2003-12-18 |
| DE19845389A1 (en) | 2000-04-06 |
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