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EP0195211A2 - Installation for filtering metallic melts - Google Patents

Installation for filtering metallic melts Download PDF

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Publication number
EP0195211A2
EP0195211A2 EP86101404A EP86101404A EP0195211A2 EP 0195211 A2 EP0195211 A2 EP 0195211A2 EP 86101404 A EP86101404 A EP 86101404A EP 86101404 A EP86101404 A EP 86101404A EP 0195211 A2 EP0195211 A2 EP 0195211A2
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EP
European Patent Office
Prior art keywords
flow
section
bores
plate
cross
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
EP86101404A
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German (de)
French (fr)
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EP0195211A3 (en
EP0195211B1 (en
Inventor
Heinz-Ulrich Prof.Dr.-Ing. Doliwa
Hans E. Winkler
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.)
E Hofmann & Soehne oHG
Original Assignee
E Hofmann & Sohne oHG
Stettner and Co
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Publication date
Application filed by E Hofmann & Sohne oHG, Stettner and Co filed Critical E Hofmann & Sohne oHG
Publication of EP0195211A2 publication Critical patent/EP0195211A2/en
Publication of EP0195211A3 publication Critical patent/EP0195211A3/en
Application granted granted Critical
Publication of EP0195211B1 publication Critical patent/EP0195211B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/004—Retaining slag during pouring molten metal by using filtering means

Definitions

  • the invention is directed to a device of metallic melts, consisting of a body formed, for example, from ceramic with a multiplicity of parallel bores.
  • a wide variety of filters are used in the barrel system in order to separate impurities in the molten metal. These come from slag residues, reaction products from metallurgical treatments of the melt, non-metallic oxides, rinsing off from the mold or residues from vessels that come into contact with the melt. They are the cause of a high reject rate or, in the best case, considerable costs for necessary post-processing.
  • Inclusions of impurities change the physical parameters of the materials, in particular the tightness of the casting, to an undetermined extent. Superficial inclusions often make it difficult to work on such surfaces due to their hardness.
  • Filters were preferably installed in the runner system of the pouring channel in order to effectively detect even the smallest of impurities.
  • Filter bodies with an open-pore foam structure have become known, the porosity of which moves within a range suitable for these casting purposes.
  • such filters have a highly irregular design of the passage channels and cell walls, which changes the direction of flow of the melt and its flow rate, but on the other hand influences the flow conditions unpredictably, so that the expected flow losses and the extension of the casting time could no longer be determined .
  • compliance with a specific casting time is absolutely necessary, for example in the production of thin-walled castings, in order to prevent incorrect castings due to non-leakage or cold welding.
  • Another type of filter are mesh-like fabrics made of highly refractory fibers, the flow cross-section of which can be defined with sufficient precision, but whose filtering action is mainly limited to the separation of indentations with a solid character.
  • filters regardless of their possible hardening with synthetic resins or the like, such filters cause considerable installation difficulties.
  • Ceramic filter plates with a large number of round bores with a small cross section can be determined with sufficient accuracy with regard to their passage cross section. However, they have the defect that they do not deflect the flow of the melt. From a certain plate thickness, their flow resistance increases, which in turn is the reason for a corresponding increase in the casting time. All known types of filters have a comparatively large dimension for the barrel or sprue section. This leads to an increasing proportion of the circulation and to an undesirable deterioration in the casting output. The filtering effect of these previously known devices assume that the melt is stowed in front of the filter and then has to flow through more or less narrow channels or bores in order to collect the contaminants adhering to the melt on the walls of the bores or channels.
  • Such metal melts are basically practically incompressible liquids, the product of which is assumed to be constant from the cross-section and flow velocity.
  • the product determines the casting volume per unit of time, the so-called casting performance, the time required to fill the mold, which is largely dependent on the material used. If a certain casting performance is to be maintained over the entire mold filling time without a part of the melt overflowing at the gate, then the flow velocity in the narrow flow cross section of the filter will increase sharply, as a rule by more than twice the flow velocity in front of the filter. This increase in the flow velocity counteracts the separation of very finely divided impurities contained in the melt, and even particles that can be separated are carried away in part by the rapid flow.
  • the invention is based on these considerations in an effort to create a filter which is as simple and uncomplicated in construction as is improved in its mode of operation. According to the invention, this object is achieved in a device of the type described in the introduction in that two plates are arranged one behind the other in the direction of flow and at a distance, the bores of which are arranged offset from one another and between which a chamber soothing the flow is provided.
  • the invention is based on the basic idea that the separation of impurities from a metallic melt requires a certain time factor, which is why in the range of Filter device the flow of the melt experiences a calming effect by reducing the flow speed. By displacing the boreholes on the inlet and outlet sides, the flow is also deflected, which significantly favors the deposition processes.
  • the invention provides in its further embodiment that the holes in the inlet-side plate are higher than the holes in the outlet-side plate and the flow of the melt between the two plates is diverted from top to bottom.
  • This arrangement of the bores on both sides makes additional measures for diverting the flow direction unnecessary. By deflecting the flow downward, the contamination particles in the melt rise upwards.
  • At least one plate has edge strips angled to the plate plane, which serve as spacers with respect to the other plate. This eliminates the need for additional components that would otherwise be required to form the calming chamber between the two plates.
  • Another alterna tive provides the invention in such a way that both plates have edge strips angled to the plate plane, which abut one another in the installed position. The plates then have approximately the same basic shape, and they differ primarily in the staggered arrangement of the holes and the different number of holes.
  • the holes can have a round cross-section.
  • efforts are being made to keep the individual flow threads free of twist, which is particularly important for sensitive casting materials.
  • the holes can have a triangular or polygonal cross section.
  • the cross section of the settling chamber corresponds approximately to the flow cross section of the pouring channel in front of the filter.
  • the flow in the settling chamber is thus slowed down to a value after passing through the inlet-side filter plate as it prevails before it enters the filter.
  • the flow cross section of the calming chamber is preferably at least twice as large as the flow cross section of the inlet-side plate.
  • the two plates 1 and 2 have an identical profile of approximately trapezoidal shape. Their outer contour thus corresponds to the runs of the pouring channel, which are usually carried out with a trapezoidal cross section.
  • the plates 1 and 2 can, however, be given any other shape.
  • the filter plate 1 is assigned to the inlet side in a pouring channel. Its upstream side is labeled 3. On two opposite sides it has an edge strip 4, which is angled to the plane of the plate 1.
  • the general shape of the outlet-side plate 2 corresponds entirely to the design of the plate 1. In this plate 2, the downstream side is designated by 5.
  • the plate 1 assigned to the inlet side has four rows of bores 6 having a cylindrical cross section in the embodiment shown.
  • the holes 6 of the individual rows are arranged one above the other in a gap.
  • the bores are located approximately in the upper half of the plate 1.
  • the bores 6 of the plate 2 likewise have a cylindrical cross section, and in the embodiment shown they are arranged in three rows one above the other, each with a gap, in the region of the lower half the plate, i.e. adjacent to the trapezoidal base.
  • the assembly of both plates 1 and 2 results from FIG. 5, the surfaces 3 and 5 each facing outwards and the edge last 4 lie flat against each other.
  • the melt enters the inner calming space 8 through the holes arranged in the head of the plate 1, and it leaves this space 8 through the holes 6 arranged in the lower plate part 6 of the plate 2.
  • the flow direction becomes both when entering, as when leaving the calming room 8 deflected at approximately a right angle.
  • the contaminants of the melt float and are deposited above the melt within the calming space 8.
  • FIGS. 7 u. 8 The embodiment of FIGS. 7 u. 8 is characterized in that the bores 6 have a triangular cross section, which prevents a twist of the thread of the melt flowing through the bores 6.
  • the attachment of the two plates 1 u. 2 in the pouring channel takes place in the usual and therefore not shown in detail in a recess in the wall into which the circumference of the plates 1 u. 2 engages.
  • the plates 1 u. 2 are preferably made of a ceramic material, which ensures good shape and high durability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Filtering Materials (AREA)

Abstract

1. Device for the filtration of metallic melts, consisting of a body formed for example of ceramic material with a plurality of parallel bores, characterised in that a plate (1) on the inflow side and a plate (2) on the outflow side are arranged in the direction of flow of the melt and at a spacing one behind the other, the bores (6) lying in the upper region of the plate (1) on the inflow side and in the lower region of the plate (2) on the outflow side, and that between these plates (1, 2) there is provided a flow damping chamber in which the flow of the melt is deflected from above to below.

Description

Die Erfindung richtet sich auf eine Vorrichtung von metallischen Schmelzen, beste.hend aus einem beispielsweise aus Keramik gebildeten Körper mit einer Vielzahl von parallelen Bohrungen. Beim.Vergießen von Metallschmelzen bedient man sich in das Laufsystem eingebauter Filter der verschiedensten Art, um in der metallischen Schmelze befindliche Verunreinigungen abzuscheiden. Solche rühren aus Schlackenresten, Reaktionsprodukten von metallurgischen Behandlungen der Schmelze, nichtmetallischen Oxiden, Losspülungen aus dem Formstdff oder auch Rückständen aus mit der Schmelze in Berührung kommenden Gefäßen her. Sie sind Ursache einer hohen Ausschußquote oder aber im günstigsten Fall erheblicher Kosten für notwendige Nachbearbeitungen. Durch Einschlüsse von Verunreinigungen verändern sich die physikalischen Parameter der Werkstoffe, insbesondere die Dichtigkeit des Gußstücks, in einem unbestimmbaren Maß. Oberflächliche Einschlüsse erschweren vielfach infolge ihrer Härte die Bearbeitung solcher Flächen.The invention is directed to a device of metallic melts, consisting of a body formed, for example, from ceramic with a multiplicity of parallel bores. When pouring molten metal, a wide variety of filters are used in the barrel system in order to separate impurities in the molten metal. These come from slag residues, reaction products from metallurgical treatments of the melt, non-metallic oxides, rinsing off from the mold or residues from vessels that come into contact with the melt. They are the cause of a high reject rate or, in the best case, considerable costs for necessary post-processing. Inclusions of impurities change the physical parameters of the materials, in particular the tightness of the casting, to an undetermined extent. Superficial inclusions often make it difficult to work on such surfaces due to their hardness.

Es hat nicht an Versuchen und aufwendigen Maßnahmen gefehlt, die Gußstücke von solchen störenden Einschlüssen freizuhalten, die unabhängig vom jeweiligen Formverfahren und den verwendeten Werkstoffen, also ebenso bei Eisen-Kohlenstoff-Gußwerkstoffen wie bei Nichteisen-Metallschmelzen auftreten.There has been no lack of trials and complex measures to keep the castings free from such interfering inclusions, which occur regardless of the respective molding process and the materials used, that is to say also in the case of iron-carbon cast materials and non-ferrous metal melts.

Bevorzugt wurden Filter in das Laufsystem des Gießkanals eingebaut, um dadurch auch Verunreinigungen geringster Größe noch wirksam zu erfassen. Es sind eine offenporige Schaumstruktur aufweisende Filterkörper bekanntgeworden, deren Porosität sich in einer für diese Gießzwecke geeigneten Bandbreite bewegt. Solche Filter weisen jedoch eine.höchst unregelmäßige Gestaltung der Durchtrittskanäle und Zellenwände auf, was zwar die Fließrichtung der Schmelze und deren Strömungsgeschwindigkeit verändert, andererseits aber die Strömungsverhältnisse insgesamt unberechenbar beeinflußt, so daß die zu erwartenden Strömungsverluste und die Verlängerung der Gießzeit nicht mehr-bestimmbar waren. Gerade die Einhaltung einer bestimmten Gießzeit ist jedoch beispielsweise bei der Herstellung dünnwandiger Gußstücke unbedingt erforderlich, um Fehlgüssen durch Nichtauslaufen oder Kaltschweißen vorzubeugen.Filters were preferably installed in the runner system of the pouring channel in order to effectively detect even the smallest of impurities. Filter bodies with an open-pore foam structure have become known, the porosity of which moves within a range suitable for these casting purposes. However, such filters have a highly irregular design of the passage channels and cell walls, which changes the direction of flow of the melt and its flow rate, but on the other hand influences the flow conditions unpredictably, so that the expected flow losses and the extension of the casting time could no longer be determined . However, compliance with a specific casting time is absolutely necessary, for example in the production of thin-walled castings, in order to prevent incorrect castings due to non-leakage or cold welding.

Eine andere Filtergattung sind netzartige Gewebe aus hochfeuerfesten Fasern, deren Durchflußquerschnitt zwar hinreichend exakt definierbar ist, deren Filterwirkung sich aber überwiegend auf das Abscheiden von Einspülungen mit Feststoffcharakter begrenzt. Außerdem bereiten derartige Filter ungeachtet ihrer möglichen Härtung mit Kunstharzen od. dgl. erhebliche Einbauschwierigkeiten.Another type of filter are mesh-like fabrics made of highly refractory fibers, the flow cross-section of which can be defined with sufficient precision, but whose filtering action is mainly limited to the separation of indentations with a solid character. In addition, regardless of their possible hardening with synthetic resins or the like, such filters cause considerable installation difficulties.

Keramische Filterplatten mit einer Vielzahl im Querschnitt runder Bohrungen von kleinem Querschnitt lassen sich hinsichtlich ihres Durchgangsquerschnitts ausreichend genau bestimmen. Ihnen haftet aber der Mangel an, daß sie die Strömung der Schmelze nicht umlenken. Ab einer bestimmten Plattendicke vergrößert sich ihr Strömungswiderstand, was wiederum Grund für eine entsprechende Verlängerung der Gießzeit ist. Alle vorbekannten Arten von Filtern erlangen eine vergleichsweise große Bemessung für den Lauf- oder Eingußabschnitt. Dies führt zu einem steigenden Kreislaufanteil und zu einer unerwünschten Verschlechterung des Gußausbringens. Die Filterwirkung dieser vorbekannten Vorrichtungen gehen davon aus, daß die Schmelze vor dem Filter gestaut und dann mehr oder weniger enge Kanäle oder Bohrungen durchströmen muß, um die der Schmelze anhaftenden Verunreinigungen an den Wänden der Bohrungen oder Kanäle aufzufangen.Ceramic filter plates with a large number of round bores with a small cross section can be determined with sufficient accuracy with regard to their passage cross section. However, they have the defect that they do not deflect the flow of the melt. From a certain plate thickness, their flow resistance increases, which in turn is the reason for a corresponding increase in the casting time. All known types of filters have a comparatively large dimension for the barrel or sprue section. This leads to an increasing proportion of the circulation and to an undesirable deterioration in the casting output. The filtering effect of these previously known devices assume that the melt is stowed in front of the filter and then has to flow through more or less narrow channels or bores in order to collect the contaminants adhering to the melt on the walls of the bores or channels.

Grundsätzlich sind solche Metallschmelzen praktisch inkompressible Flüssigkeiten, deren Produkt aus Querschnitt und Strömungsgeschwindigkeit als konstant unterstellt wird. Dabei bestimmt das Produkt das Gußvolumen pro Zeiteinheit, die sogenannte Gießleistung, die zum FormfUllen erforderliche Zeit, die weitgehend in Abhängigkeit von dem jeweils verwendeten Werkstoff vorgegeben ist. Soll eine bestimmte Gießleistung über die ganze Formfüllungszeit aufrechterhalten werden, ohne daß ein Teil der Schmelze am Einguß überläuft, so wird die Strömungsgeschwindigkeit in dem verengten Durchflußquerschnitt des Filters stark zunehmen und zwar in der Regel um mehr als das Doppelte gegenüber der Strömungsgeschwindigkeit vor dem Filter. Diese Erhöhung der Strömungsgeschwindigkeit wirkt der Abscheidung von in der Schmelze enthaltenen feinstverteilten Verunreinigungen entgegen, und selbst abscheidungsfähige Partikel werden von der schnellen Strömung teilweise wieder mitgerissen.Such metal melts are basically practically incompressible liquids, the product of which is assumed to be constant from the cross-section and flow velocity. The product determines the casting volume per unit of time, the so-called casting performance, the time required to fill the mold, which is largely dependent on the material used. If a certain casting performance is to be maintained over the entire mold filling time without a part of the melt overflowing at the gate, then the flow velocity in the narrow flow cross section of the filter will increase sharply, as a rule by more than twice the flow velocity in front of the filter. This increase in the flow velocity counteracts the separation of very finely divided impurities contained in the melt, and even particles that can be separated are carried away in part by the rapid flow.

Von diesen Erwägungen geht die Erfindung aus in dem Bemühen, einen Filter zu schaffen, der ebenso einfach und unkompliziert im Aufbau, wie in der Wirkungsweise verbessert ist. Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der eingangs bezeichneten Art dadurch gelöst, daß zwei Platten in Strömungsrichtung und in Abstand hintereinander angeordnet sind, deren Bohrungen gegeneinander versetzt angeordnet sind und zwischen denen einedie Strömung beruhigende Kammer vorgesehen ist. Die Erfindung geht hierbei von dem Grundgedanken aus, daß die Abscheidung von Verunreinigungen aus einer metallischen Schmelze einen bestimmten Zeitfaktor erfordert, weshalb im Bereich der Filtervorrichtung die Strömung der Schmelze durch Verminderung der Strömungsgeschwindigkeit eine Beruhigung erfährt. Durch das Versetzen der eingangs- und ausgangsseitigen Bohrungen gegeneinander erfährtdie Strömung zudem eine Umlenkung, die die Abscheidungsvorgänge erheblich begünstigt.The invention is based on these considerations in an effort to create a filter which is as simple and uncomplicated in construction as is improved in its mode of operation. According to the invention, this object is achieved in a device of the type described in the introduction in that two plates are arranged one behind the other in the direction of flow and at a distance, the bores of which are arranged offset from one another and between which a chamber soothing the flow is provided. The invention is based on the basic idea that the separation of impurities from a metallic melt requires a certain time factor, which is why in the range of Filter device the flow of the melt experiences a calming effect by reducing the flow speed. By displacing the boreholes on the inlet and outlet sides, the flow is also deflected, which significantly favors the deposition processes.

In Hinblick auf den Umstand, daß die abzuscheidenden Produkte in aller Regel einerAuftriebskraft unterliegen und in der Strömung unter bestimmten Bedingungen leicht aufsteigen können, sieht die Erfindung in ihrer weiteren Ausgestaltung vor, daß die Bohrungen der einlaufseitigen Platte höher liegen als die Bohrungen der auslaufseitigen Platte und der Strom der Schmelze zwischen beiden Platten von oben nach unten umgelenkt ist. Diese Anordnung der beiderseitigen Bohrungen macht zusätzliche Maßnahmen zur Umlenkung der Strömungsrichtung entbehrlich. Durch die Ablenkung der Strömung nach unten wird ein Aufsteigen der Verunreinigungspartikel in der Schmelze nach oben begünstigt.In view of the fact that the products to be separated are generally subject to a buoyant force and can rise slightly in the flow under certain conditions, the invention provides in its further embodiment that the holes in the inlet-side plate are higher than the holes in the outlet-side plate and the flow of the melt between the two plates is diverted from top to bottom. This arrangement of the bores on both sides makes additional measures for diverting the flow direction unnecessary. By deflecting the flow downward, the contamination particles in the melt rise upwards.

Es hat sich als besonders vorteilhaft erwiesen, die Anordnung so zu treffen, daß der Gesamtquerschnitt der Bohrungen der einlaufseitigen Platte größer ist als derjenige der auslaufseitigen Platte. Die Strömung wird also in der auslaufseitigen Platte erhöht. Eine besonders praktische Lösung dieses Gedankens sieht die Erfindung darin, daß die Anzahl der Bohrungen der einlaufseitigen Platte größer ist als diejenige der auslaufseitigen Platte. Eine andere Alternative besteht darin, Bohrungen unterschiedlichen Durchmessers zu verwenden.It has proven to be particularly advantageous to make the arrangement such that the total cross section of the holes in the inlet-side plate is larger than that in the outlet-side plate. The flow is therefore increased in the outlet plate. The invention sees a particularly practical solution to this idea in that the number of bores in the inlet-side plate is greater than that in the outlet-side plate. Another alternative is to use holes of different diameters.

Es liegt im Rahmen der Erfindung, daß wenigstens die eine Platte an die Plattenebene angewinkelte Randleisten aufweist, die als Abstandhalter gegenüber der anderen Platte .dienen. Auf diese Weise werden zusätzliche Bauteile entbehrlich, die andernfalls zur Ausbildung der Beruhigungskammer zwischen den beiden Platten erforderlich wären. Eine andere Alternative sieht die Erfindung in der Weise vor, daß beide Platten an die Plattenebene angewinkelte Randleisten aufweisen, die in Einbaustellung aneinander anliegen. Die Platten haben dann etwa die gleiche Grundform, und sie unterscheiden sich vornehmlich durch die versetzte Anordnung der Bohrungen und die unterschiedliche Bohrungszahl.It is within the scope of the invention that at least one plate has edge strips angled to the plate plane, which serve as spacers with respect to the other plate. This eliminates the need for additional components that would otherwise be required to form the calming chamber between the two plates. Another alterna tive provides the invention in such a way that both plates have edge strips angled to the plate plane, which abut one another in the installed position. The plates then have approximately the same basic shape, and they differ primarily in the staggered arrangement of the holes and the different number of holes.

Die Bohrungen können aus fertigungstechnischen Gründen der .Filterplatten einen runden Q.uerschnitt aufweisen. Man ist allerdings bemüht, die einzelnen Strömungsfäden von einem Drall freizuhalten, was insbesondere bei empfindlichen Gießwerkstoffen eine große Rolle spielt. Um mit Sicherheit einen möglichen Drall auszuschließen, können die Bohrungen einen dreieckigen oder auch mehreckigen Querschnitt aufweisen.For manufacturing reasons, the holes can have a round cross-section. However, efforts are being made to keep the individual flow threads free of twist, which is particularly important for sensitive casting materials. In order to rule out a possible twist with certainty, the holes can have a triangular or polygonal cross section.

Schließlich liegt es im Rahmen der Erfindung, daß der Querschnitt der Beruhigungskammer etwa dem Strömungsquerschnitt des Gießkanals vor dem Filter entspricht. In der Beruhigungskammer wird damit die Strömung nach dem Passieren der einlaufseitigen Filterplatte auf einen Wert verlangsamt, wie er vor dem Einlauf in den Filter herrscht. Dies führt zu dem Vorteil eines niedrigen Druckverlustes, was einem geringen Strömungsverlust gleichkommt, und einem besonders hohen Wirkungsgrad des Abscheidungsvorganges. Vorzugsweise ist der Strömungsquerschnitt der Beruhigungskammer mindestens doppelt so groß wie der Strömungsquerschnitt der einlaufseitigen Platte.Finally, it is within the scope of the invention that the cross section of the settling chamber corresponds approximately to the flow cross section of the pouring channel in front of the filter. The flow in the settling chamber is thus slowed down to a value after passing through the inlet-side filter plate as it prevails before it enters the filter. This leads to the advantage of a low pressure loss, which is equivalent to a low flow loss, and a particularly high efficiency of the deposition process. The flow cross section of the calming chamber is preferably at least twice as large as the flow cross section of the inlet-side plate.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung einiger bevorzugter Ausführungsformen der Erfindung sowie anhand der Zeichnung. Hierbei zeigen:

  • Fig. 1 die einlaufseitige Platte von ihrer stromabwärtigen Seite;
  • Fig. 2 die auslaufseitige Platte von der stromaufwärtigen Seite;
  • Fig. 3 einen Schnitt etwa nach Linie III - III in Fig. 1;
  • Fig. 4 einen Schnitt etwa nach Linie IV - IV in Fig. 2;
  • Fig. 5 die beiden Platten des Filters in Einbaustellung etwa im Schnitt nach Linie V - V in Fig. 6;
  • .Fig. 6 die beiden Platten in Pfeilrichtung VI in Fig. 5;
  • Fig. 7 und 8 eine abgewandelte Ausführungsform in einer den Fig. 1 und 2 entsprechenden Darstellung.
Further features, details and advantages of the invention will become apparent from the following description of some preferred embodiments of the invention and from the drawing. Here show:
  • Figure 1 shows the inlet side plate from its downstream side.
  • 2 shows the outlet-side plate from the upstream side;
  • 3 shows a section approximately along line III-III in FIG. 1;
  • 4 shows a section approximately along line IV-IV in FIG. 2;
  • 5 shows the two plates of the filter in the installed position approximately in section along the line V - V in FIG. 6;
  • .Fig. 6 the two plates in the direction of arrow VI in FIG. 5;
  • 7 and 8 a modified embodiment in a representation corresponding to FIGS. 1 and 2.

Die beiden Platten 1 und 2 weisen ein identisches Profil von etwa Trapezform auf. Ihre Außenkontur entspricht damit den üblicherweise mit Trapezquerschnitt ausgeführten Läufen des Gießkanals. Die Platten 1 und 2 können allerdings jede andere beliebige Formgebung erhalten. Die Filterplatte 1 ist der Einlaufseite in einem Gießkanal zugeordnet. Ihre stromaufwärtige Seite ist mit 3 bezeichnet. An zwei gegenüberliegenden Seiten weist sie je eine Randleiste 4 auf, die an die Ebene der Platte 1 angewinkelt ist. Die allgemeine Formgebung der auslaufseitigen Platte 2 entspricht völlig der Gestaltung der Platte 1. Bei dieser Platte 2 ist die stromabwärtige Seite mit 5 bezeichnet.The two plates 1 and 2 have an identical profile of approximately trapezoidal shape. Their outer contour thus corresponds to the runs of the pouring channel, which are usually carried out with a trapezoidal cross section. The plates 1 and 2 can, however, be given any other shape. The filter plate 1 is assigned to the inlet side in a pouring channel. Its upstream side is labeled 3. On two opposite sides it has an edge strip 4, which is angled to the plane of the plate 1. The general shape of the outlet-side plate 2 corresponds entirely to the design of the plate 1. In this plate 2, the downstream side is designated by 5.

Die der Einlaufseite-zugeordnete Platte 1 weist bei der wiedergegebenen Ausführungsform vier Reihen von einen zylindrischen Querschnitt aufweisenden Bohrungen 6 auf. Dabei sind die Bohrungen 6 der einzelnen Reihen jeweils auf Lücke übereinander angeordnet. Die Bohrungen befinden sich etwa in der oberen Hälfte der Platte 1. Die Bohrungen 6 der Platte 2 weisen gleichfalls einen zylindrischen Querschnitt auf, und sie sind bei der wiedergebenen Ausführungsform in drei Reihen übereinander, jeweils auf Lücke, angeordnet und zwar im Bereich der unteren Hälfte der Platte, also angrenzend an die Trapezbasis. Der Zusammenbau beider Platten 1 und 2 ergibt sich aus der Fig. 5, wobei die Flächen 3 und 5 jeweils nach außen weisen und die Randleisten 4 flächig aneinander anliegen. Bei der durch die Pfeile 7 angedeuteten Strömungsrichtung tritt die Schmelze durch die im Kopf der Platte 1 angeordneten Bohrungen in einen inneren Beruhigungsraum 8 ein, und sie verläßt diesen Raum 8 durch die im unteren Plattenteil angeordneten Bohrungen 6 der Platte 2. Hierbei wird die Strömungsrichtung sowohl beim Eintritt, als beim Austritt aus dem Beruhigungsraum 8 etwa im rechten Winkel abgelenkt. Hierbei schwimmen die Verunreinigungen der Schmelze auf und lagern sich oberhalb der Schmelze innerhalb des Beruhigungsraumes 8 ab.The plate 1 assigned to the inlet side has four rows of bores 6 having a cylindrical cross section in the embodiment shown. The holes 6 of the individual rows are arranged one above the other in a gap. The bores are located approximately in the upper half of the plate 1. The bores 6 of the plate 2 likewise have a cylindrical cross section, and in the embodiment shown they are arranged in three rows one above the other, each with a gap, in the region of the lower half the plate, i.e. adjacent to the trapezoidal base. The assembly of both plates 1 and 2 results from FIG. 5, the surfaces 3 and 5 each facing outwards and the edge last 4 lie flat against each other. In the direction of flow indicated by the arrows 7, the melt enters the inner calming space 8 through the holes arranged in the head of the plate 1, and it leaves this space 8 through the holes 6 arranged in the lower plate part 6 of the plate 2. Here, the flow direction becomes both when entering, as when leaving the calming room 8 deflected at approximately a right angle. Here, the contaminants of the melt float and are deposited above the melt within the calming space 8.

Die Ausführungsform nach den Fig. 7 u. 8 zeichnet sich dadurch aus, daß die Bohrungen 6 einen dreieckigen Querschnitt aufweisen, was einem Drall des die Bohrungen 6 durchströmenden Fadens der Schmelze verhindert.The embodiment of FIGS. 7 u. 8 is characterized in that the bores 6 have a triangular cross section, which prevents a twist of the thread of the melt flowing through the bores 6.

Die Befestigung der beiden Platten 1 u. 2 in dem Gießkanal erfolgt in üblicher und deshalb im einzelnen nicht wiedergegebener Weise in einer Aussparung der Wand, in die der Umfang der Platten 1 u. 2 eingreift. Die Platten 1 u. 2 bestehen vorzugsweise aus einem keramischen Werkstoff, was eine gute Formgebung und eine hohe Haltbarkeit gewährleistet.The attachment of the two plates 1 u. 2 in the pouring channel takes place in the usual and therefore not shown in detail in a recess in the wall into which the circumference of the plates 1 u. 2 engages. The plates 1 u. 2 are preferably made of a ceramic material, which ensures good shape and high durability.

Claims (10)

1. Vorrichtung zum Filtern von metallischen Schmelzen, bestehend aus einem beispielsweise aus Keramik gebildeten Körper mit einer Vielzahl von parallelen Bohrungen, dadurch gekennzeichnet, daß zwei Platten (1,2) in Strömungsrichtung (7) und in Abstand hintereinander angeordnet sind, deren Bohrungen (6) gegeneinander versetzt - sind und zwischen denen eine die Strömung beruhigende Kammer (8) vorgesehen ist.1. Device for filtering metallic melts, consisting of a body, for example made of ceramic, with a plurality of parallel bores, characterized in that two plates (1, 2) are arranged one behind the other in the direction of flow (7) and their bores ( 6) are offset from one another - and between which a chamber (8) soothing the flow is provided. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Bohrungen (6) der einlaufseitigen Platte (1) höher liegen als die Bohrungen (6) der auslaufseitigen Platte (2) und der Strom der Schmelze zwischen beiden Platten (1,2) von oben nach unten umgelenkt ist.2. Device according to claim 1, characterized in that the bores (6) of the inlet-side plate (1) are higher than the bores (6) of the outlet-side plate (2) and the flow of the melt between the two plates (1, 2) is deflected upwards downwards. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Gesamtquerschnitt der Bohrungen (6) der einlaufseitigen Platte (1) größer ist als derjenige der auslaufseitigen Platte (2).3. Device according to claim 1 or 2, characterized in that the total cross section of the bores (6) of the inlet-side plate (1) is larger than that of the outlet-side plate (2). 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Anzahl der Bohrungen (6) der einlaufseitigen Platte (1) größer ist als diejenige der auslaufseitigen Platte (2).4. Device according to one of claims 1 to 3, characterized in that the number of bores (6) of the inlet-side plate (1) is greater than that of the outlet-side plate (2). 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekeririzeychnet, daß wenigstens die eine Platte (1,2) an die Plattenebene angewinkelte Randleisten (4) aufweist, die als Abstandhalter gegenüber der anderen Platte(1,2) dienen.5. Device according to one of claims 1 to 4, characterized gekeririzeychnet in that at least one plate (1, 2) has edge strips (4) angled to the plate plane, which serve as spacers with respect to the other plate (1, 2). 6. Vorrichtung nach einem der Ansprüche 1 bis 4, dedurch gekennzeichnet, daß beide Platten (1,2) an die Plattenebene angewinkelte Randleisten (4) aufweisen, die in Einbaustellung aneinander anliegen.6. Device according to one of claims 1 to 4, characterized in that both plates (1, 2) have edge strips (4) angled to the plate plane, which abut one another in the installed position. 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Bohrungen (6) einen runden, dreieckigen oder mehreckigen Querschnitt aufweisen.7. Device according to one of claims 1 to 6, characterized in that the bores (6) have a round, triangular or polygonal cross section. 8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Platten (1,2) eine den Gießkanal-Querschnitt entsprechende Kontur aufweisen.8. Device according to one of claims 1 to 7, characterized in that the plates (1,2) have a contour corresponding to the pouring channel cross section. 9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Querschnitt der Beruhigungskammer (8) etwa dem Querschnitt des Gießkanals vor dem Filter entspricht.9. Device according to one of claims 1 to 8, characterized in that the cross section of the calming chamber (8) corresponds approximately to the cross section of the pouring channel in front of the filter. 10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Querschnitt der Beruhigungskammer (8) etwa dem doppelten Wert des Strömungsquerschnitts der einlaufseitigen Platte (1) entspricht.10. Device according to one of claims 1 to 9, characterized in that the cross section of the calming chamber (8) corresponds approximately to twice the value of the flow cross section of the inlet-side plate (1).
EP19860101404 1985-03-14 1986-02-04 Installation for filtering metallic melts Expired - Lifetime EP0195211B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853509113 DE3509113A1 (en) 1985-03-14 1985-03-14 DEVICE FOR FILTERING METAL MELT
DE3509113 1985-03-14

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EP0195211A2 true EP0195211A2 (en) 1986-09-24
EP0195211A3 EP0195211A3 (en) 1987-05-27
EP0195211B1 EP0195211B1 (en) 1990-05-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578517A1 (en) * 1992-05-29 1994-01-12 Daussan Et Compagnie Process for treating a molten metal during a casting operation using a filter and filter used therefor
CN110303142A (en) * 2019-08-13 2019-10-08 巢湖宜安云海科技有限公司 A kind of magnesium alloy cast gating apparatus

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Publication number Priority date Publication date Assignee Title
US5961918A (en) * 1996-05-20 1999-10-05 Corning Incorporated Triangular cell metal filters
CN104439085A (en) * 2014-11-25 2015-03-25 柳州金特机械有限公司 Casting sprue cup
CN106041041A (en) * 2016-08-12 2016-10-26 辽宁欣立耐火材料科技集团有限公司 Molten steel purifier for continuous casting tundish

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DE2637508A1 (en) * 1975-11-21 1977-06-02 Howmet Turbine Components FILTER FOR MOLTEN METALS, METHOD OF ITS MANUFACTURING AND USE
DE8422616U1 (en) * 1984-07-30 1984-11-15 Schäfer, Jürgen M., Dipl.-Ing., 5064 Rösrath FILTERS FOR IRON MATERIALS

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578517A1 (en) * 1992-05-29 1994-01-12 Daussan Et Compagnie Process for treating a molten metal during a casting operation using a filter and filter used therefor
CN110303142A (en) * 2019-08-13 2019-10-08 巢湖宜安云海科技有限公司 A kind of magnesium alloy cast gating apparatus
CN110303142B (en) * 2019-08-13 2021-08-27 巢湖宜安云海科技有限公司 Magnesium alloy casting gate device

Also Published As

Publication number Publication date
EP0195211A3 (en) 1987-05-27
DE3509113A1 (en) 1986-09-18
EP0195211B1 (en) 1990-05-23
DE3509113C2 (en) 1991-11-14

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