[go: up one dir, main page]

EP0592365A1 - Process and apparatus for controlling the movement of a casting ladle in a casting plant - Google Patents

Process and apparatus for controlling the movement of a casting ladle in a casting plant Download PDF

Info

Publication number
EP0592365A1
EP0592365A1 EP93810686A EP93810686A EP0592365A1 EP 0592365 A1 EP0592365 A1 EP 0592365A1 EP 93810686 A EP93810686 A EP 93810686A EP 93810686 A EP93810686 A EP 93810686A EP 0592365 A1 EP0592365 A1 EP 0592365A1
Authority
EP
European Patent Office
Prior art keywords
casting
ladle
pouring
tilting
lifting
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
EP93810686A
Other languages
German (de)
French (fr)
Other versions
EP0592365B1 (en
Inventor
Fritz Mezger
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.)
Maschinenfabrik and Eisengiesserei Ed Mezger AG
Original Assignee
Maschinenfabrik and Eisengiesserei Ed Mezger AG
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 Maschinenfabrik and Eisengiesserei Ed Mezger AG filed Critical Maschinenfabrik and Eisengiesserei Ed Mezger AG
Publication of EP0592365A1 publication Critical patent/EP0592365A1/en
Application granted granted Critical
Publication of EP0592365B1 publication Critical patent/EP0592365B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B22D39/026—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by volume using a ladler

Definitions

  • the present invention relates to a method for controlling the movement of a ladle.
  • Existing automatic pouring systems for the repeated controlled filling of liquid metals from a tiltable ladle into molds that are fed in succession function as follows: the melt runs out of the ladle over a snout stone with the radius R, the tilting axis of the ladle being at least approximately through the center of this radius. runs in such a way that, regardless of the tilt angle of the pan, approximately the same geometrical and therefore fluidic conditions are achieved. Tilting takes place via a regulated drive, which engages the pan via mechanical connecting links. To regulate this tilt drive, measuring probes can be provided and / or the casting process can be largely permanently programmed.
  • the movements around the tilting axis result in flowing movements or wave movements in the melt contained in the casting ladle, which occur during the rapid tilting back and again tilting the ladle forward between two successive pouring operations does not come to rest and at least at the beginning of each pouring operation influence the outflow of the melt and thus make it difficult or impossible to master the pouring operation reliably. It was therefore necessary to wait at least two to three seconds between the end of the pour and the start of pouring, otherwise the control process would be too disrupted.
  • the aim of the present invention is to reduce the casting time for a mold on the one hand and the time between two molds on the other without impairing the control process and thus to increase the cycle sequence of the casting of molds.
  • the melt is accelerated or slowed down much less or formulated differently, much less kinetic energy is introduced into the melt, so that the wave movements are significantly reduced.
  • a particularly simple measure according to the invention consists in that the tilting axis is raised or lowered in order to tilt the casting ladle around the center of gravity of the melt.
  • the invention relates to an advantageous use of this system, in the sense that the tilting drive and the lifting device of the system are controlled together for additional lifting of the ladle essentially without tilting movement. This makes it possible to additionally raise the ladle and, with a sufficient safety distance to a casting mold, to introduce it relatively far from the center of this mold and then to initiate the casting process.
  • Fig. 1 shows more or less schematically a conventional casting plant with a tiltable ladle 1, in which the melt 1a is located.
  • 1 shows the state in which a casting mold 2 has just been filled with melt, that is to say the casting process is to be ended by tilting the casting ladle 1 backwards.
  • a tilt drive 3 is pivoted about a tilt axis 6 via a pulling element 4, which acts on a segment 4a.
  • the ladle 1 is normally interchangeably inserted in a frame to which the segment 4a and the tilt axis 6 are attached.
  • the tilt drive 3 and the tilt axis 6 are mounted in a frame 5.
  • the pouring opening or pouring channel of the ladle 1 has a radius R with respect to the tilt axis 6. 1 also shows a sensor 7, with the aid of which it is determined when the melt rises in the pouring funnel and the casting process is to be ended.
  • the ladle is tilted clockwise about the tilt axis 6 by means of the tilt drive 3 via the pulling element 4, so that no more melt flows into the mold 2.
  • Fig. 1 it is clearly visible that with this tilting movement practically the entire volume of the melt 1a lies to the side of the tilting axis 6 and thus experiences a considerable downward acceleration overall. Experience has shown that this leads to considerable vibrations or wave movements of the melt. If a little later the ladle 1 is tilted counterclockwise to pour the melt into a next mold 2, this considerable wave motion is further increased and leads to an irregular, uncontrolled outflow of the melt.
  • FIG. 2 corresponding system parts are identified in the same way as in FIG. 1.
  • the difference is that the tilting axis 6 is no longer fixed in the machine frame.
  • the tilt axis 6 is attached to side supports 8 which are vertically displaceable in guides 9.
  • the piston rod 11 of a hydraulic drive cylinder engages which allows the supports 8 to be lifted and lowered vertically with the tilt axis 6, as the arrow indicates.
  • This lifting movement is indicated in FIG. 2, ie the drawing shows the tilt axis 6 in an upper end position, from which it can be lowered by an amount h into a lower, dash-dotted position.
  • the tilt axis 6 is additionally designated with K the point of application of the traction element 4 at sector 4a with D and the center of gravity of the melt with S. 3 now shows the conditions when the ladle tilts backwards to end a casting process according to claim 3.
  • the movement control is carried out in such a way that the tilt axis 6 is raised at a speed V K and the traction element 4 is raised at a speed V D. It can be seen from the diagram in FIG. 3 that in this case there is no vertical movement in the center of gravity S of the melt.
  • the tilting movement thus takes place practically around the center of gravity of the melt, which leads to the advantages mentioned above.
  • the movements take place in reverse, however, the path at point D can then be chosen somewhat smaller in order to additionally tip the ladle forward.
  • the relatively rapid raising or lowering of the tilt axis 6 or the pouring spout also has the advantage that a pouring process is interrupted faster and that a new pouring process is also initiated faster without the disadvantages of known systems appearing.
  • the shape of the ladle 1 is chosen so that the position of the center of gravity S with different content of the The ladle does not move significantly in the horizontal direction, so that no fundamental control of the movements in function of the pan content is absolutely necessary.
  • Fig. 4 largely corresponds to Fig. 2, again corresponding parts being identified identically.
  • a lower position of the ladle 1 is denoted by 1 '.
  • the ladle When pouring, the ladle must maintain a minimum distance A from the mold 2. You could only get the pouring ladle in this lower position with the pouring nozzle or pouring jet by the amount X1 against the mold center if you want to maintain the safety distance A. However, if you lift the ladle overall from this lower position to the upper position shown in a solid line, the tilting axis and thus the pouring spout can obviously continue to enter the center of the mold 2 by the amount X2 while maintaining the safety distance A.
  • the position of the tilt axis that can then be reached is indicated by 6 'in dash-dotted lines. It is of course a corresponding shift the carrier 5 of the tilt drive 3 of the guide 9 and the carrier 8 in a position 5 ', 3', 9 'or 8' offset to the left possible.
  • the lifting drive for the tilting axis 6 now allows this possibility to be used in a simple manner by lifting the casting ladle 1 overall by means of the lifting drive and the tilting drive in order to get closer to the mold center with the pouring jet. Later, when the ladle is tilted more, you can lower it back to the normal position and control the lift drive and the tilt drive according to the usual program in the manner described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The casting ladle (1) can not only be pivoted, by means of the tilting drive (3) and the tensile element (4), about a fixed tilting axis (6) in order to pour molten metal (1a) into a casting mould (2) or to interrupt the casting operation but the tilting axis (6) can be raised and lowered by a certain amount (h) by means of a lifting drive (11). Lifting and lowering movements of the tilting axis (6) are used to ensure that the tilting movement of the casting ladle (1) takes place approximately about the centre of gravity (S) of the molten metal (1a). Compensating flows and wave movements of the molten metal during the forward and rearward tilting of the casting ladle (1) are thereby prevented in an effective manner and the processes which occur at the beginning and ending of pouring are less complex and can be controlled reliably. The lifting drive (11) and the tilting drive (3) can be used to raise the casting ladle (1) additionally in order to move it further towards the centre of the casting mould during the initial pouring operation while maintaining a certain safety clearance with respect to the casting mould (2). <IMAGE>

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Bewegungssteuerung einer Giesspfanne. Bestehende automatische Giessanlagen zum wiederholten geregelten Einfüllen flüssiger Metalle aus einer kippbaren Pfanne in nacheinander zugeführte Formen funktionieren folgendermassen: Die Schmelze läuft während des Giessens über einen Schnauzenstein mit dem Radius R aus der Pfanne, wobei die Kippachse der Pfanne mindestens annähernd durch den Mittelpunkt dieses Radius' verläuft, derart, dass unabhängig vom Kippwinkel der Pfanne annähernd gleiche geometrische und damit strömungstechnische Verhältnisse erreicht werden. Das Kippen erfolgt über einen geregelten Antrieb, der über mechanische Verbindungsglieder an der Pfanne angreift. Zur Regelung dieses Kippantriebes können Messonden vorgesehen sein und/oder der Giessvorgang kann weitgehend fest programmiert sein. Mit derartigen Einrichtungen erreicht man zwar einen einwandfreien Ablauf des Giessvorganges beim Angiessen, während des Giessens und bei Beendigung des Giessvorganges. Es ergeben sich jedoch drei Probleme bei Anlagen, in welchen Formen automatisch in möglichst schneller Taktfolge erstellt und gefüllt werden. Zum ersten fliesst nach dem Signal "Giessende" der Steuerung, das das Rückkippen einleitet, eine relativ grosse Menge Schmelze nach, bis der Giessstrahl endgültig abbricht. Zum zweiten tritt der umgekehrte Effekt auch beim Angiessen ein, das heisst, mit dem Signal "Giessbeginn" dauert es relativ lange, bis ein gleichmässiger, regelbarer Strahl austritt. Diese beiden Umstände verlängern die Giesszeit merklich. Zum dritten entstehen durch die Bewegungen um die Kippachse Fliessbewegungen bzw. Wellenbewegungen in der in der Giesspfanne enthaltenen Schmelze, die während des raschen Zurückkippens und wieder Vorwärtskippens der Giesspfanne zwischen zwei aufeinanderfolgenden Giessvorgängen nicht zur Ruhe kommen und mindestens zu Beginn jedes Giessvorganges das Ausfliessen der Schmelze beeinflussen und damit eine sichere Beherrschung des Giessvorganges erschweren oder verunmöglichen. Man war daher gezwungen, zwischen Giessende und Giessbeginn eine Wartezeit von mindestens zwei bis drei Sekunden einzulegen, da sonst der Regelvorgang zu stark gestört war.The present invention relates to a method for controlling the movement of a ladle. Existing automatic pouring systems for the repeated controlled filling of liquid metals from a tiltable ladle into molds that are fed in succession function as follows: the melt runs out of the ladle over a snout stone with the radius R, the tilting axis of the ladle being at least approximately through the center of this radius. runs in such a way that, regardless of the tilt angle of the pan, approximately the same geometrical and therefore fluidic conditions are achieved. Tilting takes place via a regulated drive, which engages the pan via mechanical connecting links. To regulate this tilt drive, measuring probes can be provided and / or the casting process can be largely permanently programmed. With such devices, a flawless sequence of the casting process during casting, during casting and at the end of the casting process is achieved. However, there are three problems with systems in which forms are automatically created and filled in the fastest possible cycle. First, after the "pouring end" signal from the control, which initiates the tipping back, a relatively large amount of melt flows in until the pouring stream finally stops. Secondly, the reverse effect also occurs when casting on, that is, with the "start of pouring" signal, it takes a relatively long time until a uniform, controllable jet emerges. These two circumstances significantly extend the casting time. Thirdly, the movements around the tilting axis result in flowing movements or wave movements in the melt contained in the casting ladle, which occur during the rapid tilting back and again tilting the ladle forward between two successive pouring operations does not come to rest and at least at the beginning of each pouring operation influence the outflow of the melt and thus make it difficult or impossible to master the pouring operation reliably. It was therefore necessary to wait at least two to three seconds between the end of the pour and the start of pouring, otherwise the control process would be too disrupted.

Ziel vorliegender Erfindung ist es, ohne Beeinträchtigung des Regelvorganges, einerseits die Giesszeit für eine Form, anderseits auch die Zeit zwischen zwei Formen herabzusetzen und damit die Taktfolge des Abgiessens von Formen zu erhöhen. Diese Ziele werden gemäss dem Anspruch 1 erreicht. Gegenüber herkömmlichen Verfahren ergeben sich dadurch folgende Vorteile: Zum einen wird die Schmelze bei gleichem Hubbetrag der Giessschnauze um einen grösseren Winkel gekippt, was sowohl ein schnelles Zurückfliessen und damit ein rasches Giessende als auch ein schnelles Vorwärtsfliessen und damit einen rascheren Giessbeginn bewirkt.The aim of the present invention is to reduce the casting time for a mold on the one hand and the time between two molds on the other without impairing the control process and thus to increase the cycle sequence of the casting of molds. These goals are achieved according to claim 1. This has the following advantages over conventional processes: On the one hand, the melt is tilted by a larger angle with the same stroke amount of the pouring spout, which results in both a rapid backflow and thus a quick end of the pouring and a fast forward flow and thus a faster start of the pouring.

Zum anderen wird die Schmelze viel weniger beschleunigt bzw. abgebremst oder anders formuliert, es wird viel weniger kinetische Energie in die Schmelze eingeleitet, so dass die Wellenbewegungen entscheidend herabgesetzt werden.On the other hand, the melt is accelerated or slowed down much less or formulated differently, much less kinetic energy is introduced into the melt, so that the wave movements are significantly reduced.

Eine besonders einfache, erfindungsgemässe Massnahme besteht darin, dass zum Kippen der Giesspfanne um den Schwerpunkt der Schmelze die Kippachse angehoben bzw. gesenkt wird.A particularly simple measure according to the invention consists in that the tilting axis is raised or lowered in order to tilt the casting ladle around the center of gravity of the melt.

Es ergibt sich damit eine besonders einfache konstruktive Lösung gemäss Anspruch 6, die ebenfalls Gegenstand der Erfindung ist. Es ist zwar an sich bekannt, zwei Hubantriebe für die Giesspfanne vorzusehen (DE-C-606 988). Diese Antriebe dienen aber nur dazu, die Giesspfanne mit der Giessform zu kuppeln und die Giessform mit der Giesspfanne derart zu kippen, dass stets eine direkte Verbindung zwischen der Schmelze in der Giesspfanne und in der Form besteht.This results in a particularly simple constructive solution according to claim 6, which is also the subject of the invention. It is known per se to provide two lifting drives for the ladle (DE-C-606 988). These drives but only serve to couple the casting ladle to the casting mold and to tilt the casting mold with the casting ladle in such a way that there is always a direct connection between the melt in the casting ladle and in the mold.

Die Erfindung betrifft schliesslich eine vorteilhafte Verwendung dieser Anlage, in dem Sinne, dass der Kippantrieb und die Hubvorrichtung der Anlage gemeinsam zum zusätzlichen Anheben der Giesspfanne im wesentlichen ohne Kippbewegung gesteuert werden. Es wird damit möglich, die Giesspfanne zusätzlich anzuheben und unter Einhaltung eines genügenden Sicherheitsabstandes zu einer Giessform, verhältnismässig weit gegen die Mitte dieser Form, einzuführen und dann den Giessvorgang einzuleiten.Finally, the invention relates to an advantageous use of this system, in the sense that the tilting drive and the lifting device of the system are controlled together for additional lifting of the ladle essentially without tilting movement. This makes it possible to additionally raise the ladle and, with a sufficient safety distance to a casting mold, to introduce it relatively far from the center of this mold and then to initiate the casting process.

Die Erfindung wird nun anhand der Zeichnung näher erläutert.

  • Fig. 1 zeigt einen Schnitt durch eine bekannte Giessanlage,
  • Fig. 2 ist ein Schnitt durch eine erfindungsgemässe Giessanlage,
  • Fig. 3 ist ein Diagramm zur Erläuterung des Bewegungsablaufes beim Kippen der Giesspfanne, und
  • Fig. 4 ist eine der Fig. 2 entsprechende Darstellung der Giessanlage und dient der Erläuterung einer besonderen Verwendung bzw. Betriebsart der Anlage.
The invention will now be explained in more detail with reference to the drawing.
  • 1 shows a section through a known casting plant,
  • 2 is a section through a casting installation according to the invention,
  • Fig. 3 is a diagram for explaining the sequence of movements when tilting the ladle, and
  • FIG. 4 is a representation of the casting plant corresponding to FIG. 2 and serves to explain a particular use or operating mode of the plant.

Fig. 1 zeigt mehr oder weniger schematisch eine herkömmliche Giessanlage mit einer kippbaren Giesspfanne 1, in welcher sich die Schmelze 1a befindet. Fig. 1 zeigt den Zustand, in welchem eine Giessform 2 soeben mit Schmelze gefüllt wurde, der Giessvorgang also durch Rückwärtskippen der Giesspfanne 1 beendet werden soll. Dieses Rückkippen erfolgt dadurch, dass ein Kippantrieb 3 über ein Zugorgan 4, das an einem Segment 4a angreift, um eine Kippachse 6 verschwenkt wird. Entgegen der schematischen Darstellung in Fig. 1 ist die Giesspfanne 1 normalerweise auswechselbar in ein Gestell eingesetzt, an welchem das Segment 4a und die Kippachse 6 angebracht sind. Der Kippantrieb 3 und die Kippachse 6 sind in einem Gestell 5 gelagert. Die Ausgussöffnung oder Ausgussrinne der Giesspfanne 1 weist einen Radius R bezogen auf die Kippachse 6 auf. Fig. 1 zeigt ferner einen Sensor 7, mit Hilfe dessen ermittelt wird, wann die Schmelze im Giesstrichter ansteigt und somit der Giessvorgang beendet werden soll.Fig. 1 shows more or less schematically a conventional casting plant with a tiltable ladle 1, in which the melt 1a is located. 1 shows the state in which a casting mold 2 has just been filled with melt, that is to say the casting process is to be ended by tilting the casting ladle 1 backwards. This tipping back takes place in that a tilt drive 3 is pivoted about a tilt axis 6 via a pulling element 4, which acts on a segment 4a. Contrary to the schematic representation in Fig. 1, the ladle 1 is normally interchangeably inserted in a frame to which the segment 4a and the tilt axis 6 are attached. The tilt drive 3 and the tilt axis 6 are mounted in a frame 5. The pouring opening or pouring channel of the ladle 1 has a radius R with respect to the tilt axis 6. 1 also shows a sensor 7, with the aid of which it is determined when the melt rises in the pouring funnel and the casting process is to be ended.

Wie erwähnt, wird zum Beenden des Giessvorganges die Giesspfanne mit Hilfe des Kippantriebes 3 über das Zugorgan 4 im Uhrzeigersinn um die Kippachse 6 zurückgekippt, so dass keine Schmelze mehr in die Form 2 fliesst. Aus Fig. 1 ist deutlich sichtbar, dass bei dieser Kippbewegung praktisch das ganze Volumen der Schmelze 1a seitlich der Kippachse 6 liegt und somit insgesamt eine erhebliche Beschleunigung nach unten erfährt. Erfahrungsgemäss führt dies zu erheblichen Schwingungen bzw. Wellenbewegungen der Schmelze. Wenn wenig später die Giesspfanne 1 im Gegenuhrzeigersinn vorwärtsgekippt wird, um Schmelze in eine nächste Giessform 2 einzugiessen, wird diese erhebliche Wellenbewegung noch weiter verstärkt und führt zu einem unregelmässigen, unkontrollierten Ausfliessen der Schmelze.As mentioned, to end the casting process, the ladle is tilted clockwise about the tilt axis 6 by means of the tilt drive 3 via the pulling element 4, so that no more melt flows into the mold 2. From Fig. 1 it is clearly visible that with this tilting movement practically the entire volume of the melt 1a lies to the side of the tilting axis 6 and thus experiences a considerable downward acceleration overall. Experience has shown that this leads to considerable vibrations or wave movements of the melt. If a little later the ladle 1 is tilted counterclockwise to pour the melt into a next mold 2, this considerable wave motion is further increased and leads to an irregular, uncontrolled outflow of the melt.

Dieser Nachteil wird nun bei der erfindungsgemässen Anlage gemäss Fig. 2 vermieden. In Fig. 2 sind entsprechende Anlageteile gleich bezeichnet wie in Fig. 1. Der Unterschied besteht darin, dass die Kippachse 6 nicht mehr ortsfest im Maschinengestell gelagert ist. Die Kippachse 6 ist an seitlichen Trägern 8 befestigt, welche in Führungen 9 vertikal verschiebbar sind. Am oberen Ende 10 der Träger 8 greift die Kolbenstange 11 eines hydraulischen Antriebszylinders an, welcher die Träger 8 mit der Kippachse 6 vertikal anzuheben und abzusenken gestattet, wie der Pfeil andeutet. Diese Hubbewegung ist in Fig. 2 angedeutet, d.h. die Zeichnung zeigt die Kippachse 6 in einer oberen Endstellung, aus welcher sie in eine untere, strichpunktiert angedeutete Stellung um den Betrag h gesenkt werden kann.This disadvantage is now avoided in the system according to the invention according to FIG. 2. In FIG. 2, corresponding system parts are identified in the same way as in FIG. 1. The difference is that the tilting axis 6 is no longer fixed in the machine frame. The tilt axis 6 is attached to side supports 8 which are vertically displaceable in guides 9. At the upper end 10 of the carrier 8, the piston rod 11 of a hydraulic drive cylinder engages which allows the supports 8 to be lifted and lowered vertically with the tilt axis 6, as the arrow indicates. This lifting movement is indicated in FIG. 2, ie the drawing shows the tilt axis 6 in an upper end position, from which it can be lowered by an amount h into a lower, dash-dotted position.

Diese zusätzliche Hubbewegung der Giesspfanne erlaubt es nun, die Kippbewegungen der Giesspfanne bei der Einleitung und Beendigung des Giessvorganges relativ nahe um den Schwerpunkt der Schmelze erfolgen zu lassen. In Fig. 2 ist die Kippachse 6 zusätzlich mit K der Angriffspunkt des Zugorganes 4 am Sektor 4a mit D und der Schwerpunkt der Schmelze mit S bezeichnet. Fig. 3 zeigt nun die Verhältnisse beim Rückwärtskippen der Giesspfanne zur Beendigung eines Giessvorganges gemäss Anspruch 3. Die Bewegungssteuerung erfolgt derart, dass die Kippachse 6 mit einer Geschwindigkeit VK das Zugorgan 4 dagegen mit einer Geschwindigkeit VD angehoben wird. Aus dem Diagramm in Fig. 3 ist ersichtlich, dass in diesem Falle im Schwerpunkt S der Schmelze keine Vertikalbewegung erfolgt. Die Kippbewegung erfolgt somit praktisch um den Schwerpunkt der Schmelze, was zu den oben erwähnten Vorteilen führt. Beim Vorwärtskippen der Giesspfanne zur Einleitung eines nächsten Giessvorganges laufen die Bewegungen umgekehrt ab, wobei allerdings dann der Weg an der Stelle D entsprechend etwas geringer gewählt werden kann, um die Giesspfanne zusätzlich vorwärts zu kippen. Das verhältnismässig rasche Anheben bzw. Absenken der Kippachse 6 bzw. der Giessschnauze hat ausserdem den Vorteil, dass jeweils ein Giessvorgang schneller abgebrochen und dass ebenso die Einleitung eines neuen Giessvorganges schneller erfolgt, ohne dass dabei die Nachteile bekannter Anlagen in Erscheinung treten.This additional lifting movement of the ladle now allows the tilting movements of the ladle to take place relatively close to the center of gravity of the melt when the casting process is initiated and ended. In Fig. 2, the tilt axis 6 is additionally designated with K the point of application of the traction element 4 at sector 4a with D and the center of gravity of the melt with S. 3 now shows the conditions when the ladle tilts backwards to end a casting process according to claim 3. The movement control is carried out in such a way that the tilt axis 6 is raised at a speed V K and the traction element 4 is raised at a speed V D. It can be seen from the diagram in FIG. 3 that in this case there is no vertical movement in the center of gravity S of the melt. The tilting movement thus takes place practically around the center of gravity of the melt, which leads to the advantages mentioned above. When the ladle tilts forward to initiate a next pouring process, the movements take place in reverse, however, the path at point D can then be chosen somewhat smaller in order to additionally tip the ladle forward. The relatively rapid raising or lowering of the tilt axis 6 or the pouring spout also has the advantage that a pouring process is interrupted faster and that a new pouring process is also initiated faster without the disadvantages of known systems appearing.

Die Form der Giesspfanne 1 ist so gewählt, dass sich die Lage des Schwerpunktes S bei unterschiedlichem Inhalt der Giesspfanne in horizontaler Richtung nicht erheblich verschiebt, so dass keine grundsätzliche Steuerung der Bewegungsabläufe in Funktion des Pfanneninhaltes unbedingt erforderlich ist. Es ist jedoch durchaus möglich, je nach Pfannenform und Anforderungen, die Menge der in der Giesspfanne enthaltenen Schmelze zu ermitteln, was bei bestimmten Giessanlagen ohnehin geschieht, und die Steuerung der Hubbewegung der Kippachse 6 und des Kippantriebes 3 nach bestimmten Vorgaben in Funktion des Pfanneninhaltes zu regeln, so dass die fiktive Kippachse stets in der Nähe des Schwerpunkts S liegt. Es sei hier darauf hingewiesen, dass eine Verlagerung der Kippachse der Giesspfanne von der reellen Kippachse 6 in eine virtuelle Kippachse im Schwerpunkt S in Horizontal- und Vertikalrichtung praktisch schwer zu realisieren ist. Entscheidend und realisierbar ist jedoch eine Verlagerung in Horizontalrichtung in eine Position nahe einer Vertikalen durch den Schwerpunkt S der Schmelze. Eine gewisse Abweichung in Vertikalrichtung ist für den praktischen Betrieb unerheblich.The shape of the ladle 1 is chosen so that the position of the center of gravity S with different content of the The ladle does not move significantly in the horizontal direction, so that no fundamental control of the movements in function of the pan content is absolutely necessary. However, it is entirely possible, depending on the shape of the ladle and the requirements, to determine the amount of melt contained in the ladle, which is anyway the case with certain casting systems, and to control the stroke movement of the tilt axis 6 and the tilt drive 3 according to certain specifications as a function of the ladle content regulate so that the fictitious tilt axis is always close to the center of gravity S. It should be pointed out here that it is practically difficult to move the tilting axis of the casting ladle from the real tilting axis 6 into a virtual tilting axis in the center of gravity S in the horizontal and vertical directions. Decisive and realizable, however, is a shift in the horizontal direction to a position near a vertical through the center of gravity S of the melt. A certain deviation in the vertical direction is irrelevant for practical operation.

Fig. 4 entspricht weitgehend der Fig. 2, wobei wiederum entsprechende Teile gleich bezeichnet sind. In Fig. 4 ist eine untere Position der Giesspfanne 1 mit 1' bezeichnet. Beim Angiessen muss die Giesspfanne einen minimalen Abstand A von der Giessform 2 einhalten. Man könnte also mit der Giesspfanne in dieser unteren Position mit der Giessschnauze bzw. dem Giessstrahl nur um den Betrag X1 gegen die Formmitte gelangen, wenn man den Sicherheitsabstand A einhalten will. Hebt man aber die Giesspfanne insgesamt aus dieser unteren Position in die ausgezogen dargestellte obere Position an, dann kann offensichtlich unter Einhaltung des Sicherheitsabstandes A die Kippachse und damit die Giessschnauze weiter um den Betrag X2 bis praktisch in die Mitte der Giessform 2 eintreten. Die dann erreichbare Lage der Kippachse ist mit 6' in strichpunktierten Linien angedeutet. Es ist dann natürlich auch eine entsprechende Verschiebung des Trägers 5 des Kippantriebes 3 der Führung 9 und des Trägers 8 in eine nach links versetzte Position 5', 3', 9' bzw. 8' möglich. Der Hubantrieb für die Kippachse 6 erlaubt nun, diese Möglichkeit in einfacher Weise zu nutzen, indem mittels des Hubantriebes und des Kippantriebes die Giesspfanne 1 insgesamt translatorisch angehoben wird, um mit dem Giessstrahl näher an die Formmitte zu gelangen. Später, wenn die Giesspfanne stärker gekippt ist, kann man dieselbe wieder in die Normalposition absenken und in der beschriebenen Weise den Hubantrieb und den Kippantrieb nach dem üblichen Programm steuern.Fig. 4 largely corresponds to Fig. 2, again corresponding parts being identified identically. In Fig. 4, a lower position of the ladle 1 is denoted by 1 '. When pouring, the ladle must maintain a minimum distance A from the mold 2. You could only get the pouring ladle in this lower position with the pouring nozzle or pouring jet by the amount X1 against the mold center if you want to maintain the safety distance A. However, if you lift the ladle overall from this lower position to the upper position shown in a solid line, the tilting axis and thus the pouring spout can obviously continue to enter the center of the mold 2 by the amount X2 while maintaining the safety distance A. The position of the tilt axis that can then be reached is indicated by 6 'in dash-dotted lines. It is of course a corresponding shift the carrier 5 of the tilt drive 3 of the guide 9 and the carrier 8 in a position 5 ', 3', 9 'or 8' offset to the left possible. The lifting drive for the tilting axis 6 now allows this possibility to be used in a simple manner by lifting the casting ladle 1 overall by means of the lifting drive and the tilting drive in order to get closer to the mold center with the pouring jet. Later, when the ladle is tilted more, you can lower it back to the normal position and control the lift drive and the tilt drive according to the usual program in the manner described.

Claims (9)

Verfahren zur Bewegungssteuerung einer Giesspfanne (1) mittels zweier Hubvorrichtungen (3, 4; 8), wobei die reelle bzw. virtuelle Achse, um welche die Giesspfanne (1) gekippt wird während des Giessens im Mittelpunkt des Radius (R) der Ausgussöffnung liegt, dadurch gekennzeichnet, dass zur Einleitung und Beendigung des Giessens die reelle bzw. virtuelle Achse mindestens annähernd in den Schwerpunkt der Schmelze versetzt ist.Method for controlling the movement of a pouring ladle (1) by means of two lifting devices (3, 4; 8), the real or virtual axis about which the pouring ladle (1) is tilted during the pouring being in the center of the radius (R) of the pouring opening, characterized in that the real or virtual axis is at least approximately displaced into the center of gravity of the melt in order to initiate and end the casting. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zum Kippen der Giesspfanne (1) zur Einleitung und Beendigung des Giessens eine Kippachse (6) im Mittelpunkt der Ausgussrinne angehoben bzw. gesenkt wird.A method according to claim 1, characterized in that a tilting axis (6) is raised or lowered in the center of the pouring spout to tilt the pouring ladle (1) to initiate and end the pouring. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Hub- bzw. Senkbewegung der Kippachse (6) mit der Hub- bzw. Senkbewegung zum Kippen der Giesspfanne derart koordiniert werden, dass die virtuelle Kippachse der Pfannenbewegung in die Nähe des Schwerpunktes (S) der Schmelze zu liegen kommt.Method according to claim 1 or 2, characterized in that the lifting or lowering movement of the tilting axis (6) is coordinated with the lifting or lowering movement for tilting the pouring ladle in such a way that the virtual tilting axis of the ladle movement in the vicinity of the center of gravity (p ) the melt comes to rest. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Menge der Schmelze (1a) ermittelt und die Kippvorgänge in Funktion dieser Menge gesteuert werden.Method according to one of claims 1 to 3, characterized in that the amount of melt (1a) is determined and the tilting processes are controlled as a function of this amount. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Giesspfanne (1) mittels einer Hubvorrichtung (3, 4) zum Kippen derselben und einer Hubvorrichtung (8 bis 11) für die Kippachse (6) bei Giessbeginn zusätzlich angehoben wird, um bei gegebener Giesshöhe weiter zur Mitte der Form (2) hin eingiessen zu können.Method according to one of claims 1 to 4, characterized in that the casting ladle (1) is additionally raised by means of a lifting device (3, 4) for tilting the same and a lifting device (8 to 11) for the tilting axis (6) at the start of casting for a given pouring height to be able to pour in further towards the center of the mold (2). Giessanlage mit einer Giesspfanne (1), die mittels zweier Hubvorrichtungen (3, 4; 8) steuerbar ist, von welchen die eine bei der Ausgussöffnung und die andere auf der anderen Seite der Giesspfanne angreift, und mit einer gemeinsamen Bewegungssteuerung für die beiden Hubvorrichtungen, dadurch gekennzeichnet, dass die beiden Hubbewegungen derart koordiniert sind, dass die Giesspfanne (1) bei Einleitung und Beendigung des Giessens mindestens annähernd im Schwerpunkt der Schmelze gekippt wird.Casting plant with a pouring ladle (1) which can be controlled by means of two lifting devices (3, 4; 8), one of which acts on the pouring spout and the other on the other side of the pouring ladle, and with a common movement control for the two lifting devices, characterized in that the two lifting movements are coordinated in such a way that the casting ladle (1) is tilted at least approximately in the center of gravity of the melt when the casting is initiated and ended. Giessanlage nach Anspruch 6, dadurch gekennzeichnet, dass die Hubbewegung (6) bei der Ausgussöffnung starr geführt ist.Casting installation according to claim 6, characterized in that the lifting movement (6) is rigidly guided at the pouring opening. Anlage nach Anspruch 6 oder 7, gekennzeichnet durch Mittel zur Erfassung der Menge der in der Giesspfanne enthaltenen Schmelze (1a) und zur Beeinflussung der Bewegungssteuerung in Abhängigkeit von dieser Menge.Plant according to claim 6 or 7, characterized by means for detecting the amount of the melt (1a) contained in the casting ladle and for influencing the movement control as a function of this amount. Verwendung der Anlage nach Anspruch 6, dadurch gekennzeichnet, dass der Kippantrieb (3, 4) und die Hubvorrichtung (8 bis 11) gemeinsam zum zusätzlichen Anheben der Giesspfanne (1) im wesentlichen ohne Kippbewegung gesteuert werden.Use of the system according to claim 6, characterized in that the tilting drive (3, 4) and the lifting device (8 to 11) are controlled together for additional lifting of the pouring ladle (1) essentially without tilting movement.
EP93810686A 1992-10-07 1993-09-28 Process and apparatus for controlling the movement of a casting ladle in a casting plant Expired - Lifetime EP0592365B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH313592 1992-10-07
CH3135/92 1992-10-07

Publications (2)

Publication Number Publication Date
EP0592365A1 true EP0592365A1 (en) 1994-04-13
EP0592365B1 EP0592365B1 (en) 1997-08-20

Family

ID=4249378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93810686A Expired - Lifetime EP0592365B1 (en) 1992-10-07 1993-09-28 Process and apparatus for controlling the movement of a casting ladle in a casting plant

Country Status (4)

Country Link
US (1) US5381855A (en)
EP (1) EP0592365B1 (en)
JP (1) JPH06190541A (en)
DE (1) DE59307156D1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997024200A1 (en) * 1995-12-29 1997-07-10 Fritz Lauper Method and equipment for controlling the movements of a casting ladle with a short pouring height in a foundry
CN102389967A (en) * 2011-10-25 2012-03-28 岳睿 Pouring system based on camera and pyrometer control
AT514648A1 (en) * 2013-05-27 2015-02-15 Fill Gmbh Method for tilt casting
DE102015107951A1 (en) 2015-05-20 2016-11-24 INDUGA Industrieöfen u. Giesserei-Anlagen GmbH & Co. KG Method and device of a control of the casting process during casting of a casting mold by means of a gravitationally empty rotatable ladle
US9895743B2 (en) 2013-05-27 2018-02-20 Fill Gesellschaft M.B.H. Method and device for casting a cast part
CN109877304A (en) * 2019-04-04 2019-06-14 江苏永瀚特种合金技术有限公司 A kind of vacuum pouring positioning system and method
CN111112592A (en) * 2020-01-14 2020-05-08 合肥工业大学 Molten metal filling equipment

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3079018B2 (en) * 1995-04-19 2000-08-21 藤和機工株式会社 Automatic pouring method and device
NO300745B1 (en) * 1995-05-02 1997-07-14 Ind Informasjonsteknologi As Method for determining the amount of liquid metal in casting furnaces
DE69511071T2 (en) * 1995-06-07 2000-03-09 Inductotherm Corp. Video system for positioning a ladle
JPH09212243A (en) * 1996-02-02 1997-08-15 Santoku Kinzoku Kogyo Kk Inclination flow rate control device for liquid material in container and control method thereof
US5792378A (en) * 1996-08-02 1998-08-11 Lockheed Martin Advanced Environmental Systems, Inc. Method and apparatus for controlling the flow rate and aiming when pouring molten material from a container
CA2292650C (en) * 1997-06-27 2005-10-25 Hubo Engineering Gmbh A method and device for the movement control of a teeming ladle with a low teeming height in a teeming installation
US6168053B1 (en) 1999-06-21 2001-01-02 Consarc Corporation Positioning apparatus and method for precision pouring of a liquid from a vessel
US6896032B1 (en) * 2002-09-26 2005-05-24 Hayes Lemmerz International, Inc. Stopper-poured molten metal casting vessel with constant head height
US6892791B1 (en) * 2002-12-20 2005-05-17 Hayes Lemmerz International Trajectory compensation for tiltable stopper-poured molten metal casting vessel
TWI280166B (en) * 2002-12-26 2007-05-01 Toshiba Machine Co Ltd Liquid material feed apparatus of die casting machine, liquid material feed method, and ladle
CN100516741C (en) * 2004-09-02 2009-07-22 开普敦大学 Casting method and equipment
TWI466740B (en) 2007-02-15 2015-01-01 新東工業股份有限公司 Automatic injection method and device
US9186725B2 (en) * 2009-05-08 2015-11-17 Sintokogio, Ltd. Carriage to transport a ladle and to transfer molten metal into equipment for pouring and transportation line for transporting molten metal
JP5408793B2 (en) * 2010-04-22 2014-02-05 新東工業株式会社 Tilt-type automatic pouring method and storage medium storing ladle tilt control program
WO2012088580A1 (en) 2010-12-29 2012-07-05 Imac Inc. Die casting machine and method
DE102012109248A1 (en) * 2012-09-28 2014-04-03 Fluxana GmbH & Co. KG Preparation of analysis samples
CN109530668B (en) * 2018-10-24 2021-05-28 广德亚太汽车智能制动系统有限公司 Ladle casting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1749083A (en) * 1929-03-18 1930-03-04 Wetherill Morris Engineering C Apparatus for pouring liquids such as molten metal
DE606988C (en) * 1932-08-06 1934-12-14 Fried Krupp Grusonwerk Akt Ges Device for casting metal blocks
GB2058624A (en) * 1979-09-17 1981-04-15 Fataluminium Spa Metal-casting machine with cam-controlled ladle
EP0163261A2 (en) * 1984-06-01 1985-12-04 Clemens-A. Dipl.-Ing. Verbeek Dosing equipment for metallic melts

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463811A (en) * 1947-12-12 1949-03-08 Edmund F Schulze Ladle tipping mechanism
US2892225A (en) * 1954-06-23 1959-06-30 Buhrer Erwin Process and means for casting system for operating pouring ladles
CA1011082A (en) * 1974-06-17 1977-05-31 Noranda Mines Limited Vessel pouring control cam assembly
US4112998A (en) * 1975-10-22 1978-09-12 Fujiwa Kika Kabushiki Kaisha Pouring method and apparatus therefor
JPS61229463A (en) * 1985-04-03 1986-10-13 Mitsubishi Electric Corp Industrial robot device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1749083A (en) * 1929-03-18 1930-03-04 Wetherill Morris Engineering C Apparatus for pouring liquids such as molten metal
DE606988C (en) * 1932-08-06 1934-12-14 Fried Krupp Grusonwerk Akt Ges Device for casting metal blocks
GB2058624A (en) * 1979-09-17 1981-04-15 Fataluminium Spa Metal-casting machine with cam-controlled ladle
EP0163261A2 (en) * 1984-06-01 1985-12-04 Clemens-A. Dipl.-Ing. Verbeek Dosing equipment for metallic melts

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997024200A1 (en) * 1995-12-29 1997-07-10 Fritz Lauper Method and equipment for controlling the movements of a casting ladle with a short pouring height in a foundry
CN102389967A (en) * 2011-10-25 2012-03-28 岳睿 Pouring system based on camera and pyrometer control
AT514648A1 (en) * 2013-05-27 2015-02-15 Fill Gmbh Method for tilt casting
AT514648A8 (en) * 2013-05-27 2015-05-15 Fill Gmbh Method for tilt casting
US9895743B2 (en) 2013-05-27 2018-02-20 Fill Gesellschaft M.B.H. Method and device for casting a cast part
EP3003604B1 (en) 2013-05-27 2018-10-03 Nemak, S.A.B. de C.V. Method and device for casting a cast part
DE102015107951A1 (en) 2015-05-20 2016-11-24 INDUGA Industrieöfen u. Giesserei-Anlagen GmbH & Co. KG Method and device of a control of the casting process during casting of a casting mold by means of a gravitationally empty rotatable ladle
DE102015107951B4 (en) 2015-05-20 2018-09-13 INDUGA Industrieöfen u. Giesserei-Anlagen GmbH & Co. KG Method and device of a control of the casting process during casting of a casting mold by means of a gravitationally empty rotatable ladle
CN109877304A (en) * 2019-04-04 2019-06-14 江苏永瀚特种合金技术有限公司 A kind of vacuum pouring positioning system and method
CN111112592A (en) * 2020-01-14 2020-05-08 合肥工业大学 Molten metal filling equipment
CN111112592B (en) * 2020-01-14 2022-10-21 合肥工业大学 A liquid metal filling equipment

Also Published As

Publication number Publication date
EP0592365B1 (en) 1997-08-20
US5381855A (en) 1995-01-17
DE59307156D1 (en) 1997-09-25
JPH06190541A (en) 1994-07-12

Similar Documents

Publication Publication Date Title
EP0592365B1 (en) Process and apparatus for controlling the movement of a casting ladle in a casting plant
EP0444297B1 (en) Method for starting up automatically a continuous casting installation
EP0996517B1 (en) Method and device for controlling the movement of a teeming ladle having a low teeming height in a teeming installation
DE3532763A1 (en) Method and apparatus for the automatic pouring of molten metal
DE3323465C2 (en)
DE2124747C3 (en) Device for controlling a stopper closure on a pouring container
DE2933989A1 (en) DEVICE FOR DRAINING METAL MELT AND SLAG REMAINING IN AN INTERMEDIATE CONTAINER
DE2307846A1 (en) Automatically pouring molten metal - melt forced by gas pressure from reservoir in which melt level is indirectly determined by weight
DE69505670T2 (en) METHOD AND DEVICE FOR LOADING AN ELECTRIC OVEN WITH LIQUID METAL
EP0011696B1 (en) Device for supplying a continuously rotating casting table
EP0400302B1 (en) Method of and installation for filling a continuous casting mold with molten metal
EP0383413B1 (en) Continuous-casting method
DE3528328C2 (en)
DE2811546A1 (en) METHOD AND DEVICE FOR CONTINUOUS STEEL CASTING
EP0197494A1 (en) Method and apparatus for casting molten metals
DE2146221A1 (en) Continuous casting plant ladle cradles - with cylinder operated tilting mechanisms
DE3344127A1 (en) Method and apparatus for filling a continuous casting mould when casting on a strand
DE2351816B2 (en) PROCESS AND EQUIPMENT FOR REGULATING THE LEVEL OF THE MELT IN MOLDS OF CONTINUOUS CASTING PLANTS
WO1997024200A1 (en) Method and equipment for controlling the movements of a casting ladle with a short pouring height in a foundry
DE19546340A1 (en) Device for feeding steel into a continuous casting mold
DE2804381A1 (en) Dosing molten metal into casting machine - via tilting scoop moved between melting furnace and die on machine
DE1140675B (en) Feeding vessel for the automatic feeding of the casting material during continuous casting
AT403773B (en) METALLURGICAL VESSEL
DE3223803A1 (en) Control process and device for repeated pouring of equal quantities of melt from a ladle
DE489866C (en) Method and device for the production of hollow metal bodies by centrifugal casting

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR IT LI

17P Request for examination filed

Effective date: 19940307

17Q First examination report despatched

Effective date: 19960213

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19970820

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19970820

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59307156

Country of ref document: DE

Date of ref document: 19970925

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970930

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970930

EN Fr: translation not filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980603

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed