EP2193001A2 - Dosing furnace and rising pipe for delivering molten metal - Google Patents
Dosing furnace and rising pipe for delivering molten metalInfo
- Publication number
- EP2193001A2 EP2193001A2 EP08829753A EP08829753A EP2193001A2 EP 2193001 A2 EP2193001 A2 EP 2193001A2 EP 08829753 A EP08829753 A EP 08829753A EP 08829753 A EP08829753 A EP 08829753A EP 2193001 A2 EP2193001 A2 EP 2193001A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- riser
- molten metal
- diffuser
- pipe
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 44
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 230000000630 rising effect Effects 0.000 title claims abstract 4
- 230000007704 transition Effects 0.000 claims abstract description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 8
- 238000004512 die casting Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000003723 Smelting Methods 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
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/28—Melting pots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/14—Charging or discharging liquid or molten material
- F27D3/145—Runners therefor
Definitions
- the invention relates to a metering furnace for dispensing metered portions of a molten metal, in particular liquid aluminum alloy, further to a riser for use in the metering furnace and to a set of risers of different caliber.
- Such dosing furnaces comprise a refractory lined housing forming a molten metal tub, a filling tube for feeding the molten metal into the tub, a riser for dispensing portions of molten material, and a
- Pressure supply device for generating an overpressure in the interior of the metering furnace for the purpose of dispensing each a molten metal portion.
- the riser interior has an inlet-side throttle, a diffuser and a pipe section.
- Dosing furnaces are used, among other things, to feed die-casting machines for sand molds or molds, ie to fill their filling chamber with a molten metal portion. It depends on exactly measured portions of the molten metal. If the filling quantity is too small, damage may occur in the die casting machine because the pressure piston of the die casting machine abuts against the filling chamber wall. In addition, the produced die casting becomes defective.
- riser pipes which have a dome shape at the inlet-side throttle
- riser tubes which have conical shape at the inlet-side choke (DE 20 2005 017110 Ul). In the riser tubes in dome shape it comes to stalls behind the throttle and thus to turbulence in dead spaces, which reduces the throughput (flow rate) of melt. at
- Riser pipes are designed for different areas of molten metal portions, d. H. built with different calibers. Based on a respective caliber of the riser is the
- Metal smelting portion controlled by the height and the duration of the overpressure in the metering furnace.
- An overpressure in the metering furnace can therefore build up because the riser is immersed in the molten metal and the throttle of the riser inhibits the outflow of molten metal.
- the riser throttle can be considered as a metering orifice that allows a substantially constant stream of material to pass through.
- Transient effects of the material flow which depend on many parameters, which can not be kept constant. In the course of the transient process, there are fluctuations in the material flow, which can range up to overshoots.
- Fluctuations may change from time to time as the dosing furnace operates, which makes precise metering of the delivered molten metal portions difficult and inaccurate.
- the invention has for its object to avoid the identified shortcomings.
- a riser is to be specified, with which the transient phenomena can be smooth in the delivery of a molten metal portion and show a virtually aperiodic course.
- the cleaning of the riser should lead to consistent quality of the geometric shape.
- the object is achieved with a riser whose inner surface between throttle section,
- the mathematical first derivative df (x) / dx of the function f (x) of the inside diameter of the riser as a function of the distance x along the axis of symmetry constitutes a continuous function, i. a function without jumps.
- the inlet-side throttle section merges into the diffuser section without edges, with a first rounding radius
- the diffuser merges into the pipe section without edges, with a second rounding radius.
- the radii of curvature are chosen to be large compared to the inlet diameter or the outlet diameter. "Big” here means “almost an order of magnitude or more, larger”.
- a riser tube of appropriate caliber is selected from a set of riser tubes and inserted into the dosing furnace.
- the set of risers of different caliber covers the total range of molten metal flows of the respective dosing furnace.
- FIG. 2 shows a partial view of the interior of a metering furnace
- FIG. 3 shows a diagram of the mass flow over the time of a conventional riser
- FIG. 4 shows a diagram of the mass flow over time in an inventive Riser
- Fig. 5 is a longitudinal section through a riser
- FIG. 6 shows a longitudinal section through a further riser pipe and FIG. 7 shows a cleaning tool for cleaning riser pipes.
- Fig. 1 is a schematic representation of the interior of a metering furnace. This includes an inner refractory lined housing 1, which forms a trough for the molten metal, a filling tube 2 for supplying the molten metal into the trough, a riser pipe 3 for dispensing molten metal portions and a pressure supply device 4 for generating an overpressure inside the dosing oven, respectively
- the level of the melt in the metering furnace is indicated by a level 5.
- the filling tube 2 is made of ceramic or refractory concrete and forms a narrowing funnel with a narrow outlet, which forms a closure for the overpressure generated in the interior during operation of the metering furnace, on the other hand allows the inflow of molten metal into the tub.
- the operation of the metering furnace is intermittent, d. H. for delivery of a molten metal portion on the riser pipe 3, an overpressure is generated during a certain time, for example for 8 seconds, which serves to convey a molten metal portion through the riser pipe 3 into the filling chamber, for example, an aluminum die-casting machine.
- the applied pressures are in the range of 10 mbar to 200 mbar and preferably in the range of 40 to 80 mbar.
- the riser 3 must act as a temporary closure, i. H. the construction of the pressure is much faster than the possible outflow of material through the riser. 3
- Fig. 2 shows the basic structure of a riser 3.
- the wall of the riser is made of ceramic or refractory concrete.
- the riser interior 30 includes three sections, namely an inlet side throttle section 31, a croqusdiffusorabites 32 and an outlet side pipe section 33.
- the throttle 31 delays the outflow of the molten metal at pressure buildup in the housing 1, so that by means of the pressure supply means 4 a desired level of overpressure in Can adjust housing 1. Then, the throttle 31 acts as a metering orifice, that is, when set, constant pressure flows in an approximately constant current through the riser. 3 However, before this constant, subsidized current comes, the current must be triggered by the value zero to the desired value, which can lead to transient processes.
- FIG. 3 shows the behavior of the mass flow in a conventional riser of the dome shape. Overshoot processes are formed before the roughly constant mass flow results.
- Fig. 4 shows the behavior of the mass flow in a riser according to the invention. As clearly visible, the transient process is practically aperiodic, ie there are no overshoots.
- the formation of the riser according to the invention will be described with reference to FIGS. 5 and 6.
- the riser interior 30 is smoothed by a finishing treatment.
- the three sections throttle 31, diffuser 32 and pipe section 33 can be distinguished, the lengths of which are marked L31, L32 and L33.
- the inlet diameter is denoted by Di and the outlet diameter by Do.
- the outer diameter of the riser is Da.
- Throttle portion 31 is round cylindrical and merges without edges with a rounding radius Rl in the conical diffuser section 32.
- the tube section 33 is slightly conical with an opening angle of 1 ° to the outlet and merges edgewise with a rounding radius R2 into the diffuser section 32.
- the inner cutting lines in the axial longitudinal section through the riser pipe 3 are continuously differentiable and are generally S-shaped in the diffuser section 32.
- the radii R1 and R2 can be chosen so that the curves generated by them, which are parts of torus surfaces, tangentially merge into each other, ie form an inflection point in axial section, at which the maximum cone opening angle ⁇ of the diffuser section 32 can be measured.
- the outer shape of the riser pipe 3 may be rounded or, as shown, be edged. However, on the input side should be provided at the transition of the outer surface to the inner surface of the riser a sharp peripheral edge 34, and the output side should be no "tripping edge" given to a secondary pipe, which requires a further sharp peripheral edge 35.
- riser pipes are available with a total length L of 570 mm.
- the outlet diameter Do is in the range of 40 to 80 mm and the inlet diameter Di is in the range of 12 to 40 mm. It is understood that the respective smaller values of the diameters are combined with each other and the respective larger diameters.
- the maximum opening angle ⁇ of the diffuser 32 is approximately
- the throttle portion 31 does not need to be strictly cylindrical, but a slightly conical shape is permissible.
- the measured in the axial direction wall angle in the throttle section can be selected in the range of 0 to 1 °. Also, for the cone opening angle of the diffuser 32, there is a preferred range ranging from 8 ° to 16 °.
- a wall angle in the range of 0.5 ° to 2 ° is selected, which facilitates the cleaning of the riser of solidified molten metal.
- the first rounding radius R1 is preferably greater than 30 mm and may be in the range of 100 to 200 mm and the second rounding radius R2 is preferably greater than 50 mm and may be selected in the range of 200 to 300 mm.
- Delivery pressure a mass flow of 120 kg / min. It may be assumed that this increase in the flow rate and the improved transient response to the avoidance of vortices or turbulence in the individual sections (throttle, diffuser, pipe section) is due within the riser pipe according to the invention.
- a metering furnace has a total range of metered portions that is usually covered with a set of risers of different calibers.
- By the new flow-optimized riser shows an increased throughput, you can cover the entire area of the portions to be measured with fewer risers in the sentence than before.
- In a dosing furnace of commercial size can be with five risers (instead of previously seven or eight risers) get along in the sentence, which have the following dimensions:
- a coating is removed from time to time, which corresponds to one in Fig. 7 shown tool 7 can be done.
- This has a rod 70 with handle 71 and a scraper 72 which is formed as a half-round disc with a radius matching the inlet diameter of the respective riser pipe 3. Also, the diameter of the rod 70 can be selected as a function of the riser size. Since the interior 30 of the riser is edgeless, the risk of violent abutment of the scraper 72 on the pipe wall interior due to inertial forces in the direction change is avoided at edges, so that
- a half-round disc as a scraper 72 and a Ahlenartiger forming scraper can be used, which is adapted to the S-shaped curvature of each one riser interior 30 to work out the desired geometry of the riser inside each time cleaning process again.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Charging Or Discharging (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
Dosierofβn und Steigrohr zur Abgabe von Metallschmelze Dosierofβn and riser for the delivery of molten metal
Die Erfindung bezieht sich auf einen Dosierofen zur Abgabe von abgemessenen Portionen einer Metallschmelze, insbesondere flüssige Aluminiumlegierung, ferner auf ein Steigrohr zur Verwendung in dem Dosierofen sowie auf einen Satz von Steigrohren unterschiedlichen Kalibers.The invention relates to a metering furnace for dispensing metered portions of a molten metal, in particular liquid aluminum alloy, further to a riser for use in the metering furnace and to a set of risers of different caliber.
Derartige Dosieröfen umfassen ein feuerfest ausgekleidetes Gehäuse, das eine Wanne für die Metallschmelze bildet, ferner ein Füllrohr zur Zuführung der Metallschmelze in die Wanne, ein Steigrohr zur Abgabe von Materialschmelzportionen und eineSuch dosing furnaces comprise a refractory lined housing forming a molten metal tub, a filling tube for feeding the molten metal into the tub, a riser for dispensing portions of molten material, and a
Druckzuführungseinrichtung zur Erzeugung eines Überdrucks im Inneren des Dosierofens zwecks Abgabe je einer Metallschmelzportion. Das Steigrohrinnere weist eine einlaufseitige Drossel, einen Diffusor und einen Rohrabschnitt auf. Dosieröfen werden dazu verwendet, unter anderem Druckgussmaschinen für Sandformen oder für Kokillen zu beschicken, d. h. deren Füllkammer mit einer Metallschmelzportion zu füllen. Dabei kommt es auf genau abgemessene Portionen der Metallschmelze an. Ist die Füllmenge zu klein, kann es in der Druckgussmaschine zu Beschädigungen kommen, weil der Druckkolben der Druckgussmaschine an der Füllkammerwand anschlägt. Außerdem wird das hergestellte Druckgussstück mangelhaft. Wenn die Metallschmelzportion zu groß ist, besteht die Gefahr, dass die aus einzelnen Teilen bestehende Druckgussform auseinander gepresst wird, was ebenfalls zu Beschädigung führen kann, jedenfalls aber unbrauchbare Druckgusswerkstücke liefert. Somit ist die genaue Bemessung der Metallschmelzportionen von ausschlaggebender Bedeutung.Pressure supply device for generating an overpressure in the interior of the metering furnace for the purpose of dispensing each a molten metal portion. The riser interior has an inlet-side throttle, a diffuser and a pipe section. Dosing furnaces are used, among other things, to feed die-casting machines for sand molds or molds, ie to fill their filling chamber with a molten metal portion. It depends on exactly measured portions of the molten metal. If the filling quantity is too small, damage may occur in the die casting machine because the pressure piston of the die casting machine abuts against the filling chamber wall. In addition, the produced die casting becomes defective. If the molten metal portion is too large, there is a risk that the individual parts of existing die casting mold is pressed apart, which can also lead to damage, but at least useless Supplies die cast workpieces. Thus, the exact dimensioning of the molten metal portions is of crucial importance.
Im Stand der Technik gibt es Steigrohre, die bei der einlaufseitigen Drossel Kalottenform aufweisen, undIn the prior art, there are riser pipes, which have a dome shape at the inlet-side throttle, and
Steigrohre, die bei der einlaufseitigen Drossel Konusform aufweisen (DE 20 2005 017110 Ul) . Bei den Steigrohren in Kalottenform kommt es zu Strömungsabrissen hinter der Drossel und damit zu Verwirbelungen in Toträumen, was den Durchsatz (Stromrate) an Schmelze vermindert. BeiRiser tubes, which have conical shape at the inlet-side choke (DE 20 2005 017110 Ul). In the riser tubes in dome shape it comes to stalls behind the throttle and thus to turbulence in dead spaces, which reduces the throughput (flow rate) of melt. at
Steigrohren in Konusform unmittelbar hinter der Drossel wird zwar die Gefahr der Totraumbildung herabgesetzt, jedoch ist die Genauigkeit der Abgabemenge der Metallschmelze dennoch nicht optimal. Dies beruht darauf, dass zwischen den einzelnen Abschnitten der Steigrohre Kanten ausgebildet sind. Beim Reinigen des Steigrohrs können außerdem diese Kanten in ihrer Lage leicht verändert werden, wenn zu wenig oder zu viel Material von der Steigrohrinnenwandung entfernt wird. Dies führt zu Veränderungen der Geometrie des Steigrohrs und damit zuRisers in the cone shape immediately behind the throttle, although the risk of dead space formation is reduced, but the accuracy of the discharge amount of the molten metal is still not optimal. This is based on the fact that edges are formed between the individual sections of the riser pipes. When cleaning the riser also these edges can be easily changed in their position if too little or too much material is removed from the riser inner wall. This leads to changes in the geometry of the riser and thus
Veränderung der Förderung der Schmelze nach Reinigung des Steigrohrs .Change in the promotion of the melt after cleaning the riser.
Steigrohre sind für unterschiedliche Bereiche von Metallschmelzportionen ausgelegt, d. h. mit unterschiedlichen Kalibern gebaut. Basierend auf einem jeweiligen Kaliber des Steigrohrs wird dieRiser pipes are designed for different areas of molten metal portions, d. H. built with different calibers. Based on a respective caliber of the riser is the
Metallschmelzportion durch die Höhe und die zeitliche Dauer des Überdrucks im Dosierofen gesteuert. Ein Überdruck im Dosierofen kann sich deshalb aufbauen, weil das Steigrohr in die Metallschmelze eintaucht und die Drossel des Steigrohrs den Abfluss von Metallschmelze hemmt. Wenn sich ein konstanter Überdruck im Inneren des Dosierofens aufgebaut hat, kann die Steigrohrdrossel als eine Messblende angesehen werden, die einen im Wesentlichen konstanten Materialstrom hindurchlässt . Bevor es jedoch zu diesem konstanten Materialstrom kommt, gibt es Einschwingvorgänge des Materialstroms, die von vielerlei Parametern abhängen, welche nicht konstant gehalten werden können. Im zeitlichen Verlauf des Einschwingvorgangs kommt es zu Schwankungen des Materialstroms, die bis zu Überschwingvorgängen reichen können. Die Größe derMetal smelting portion controlled by the height and the duration of the overpressure in the metering furnace. An overpressure in the metering furnace can therefore build up because the riser is immersed in the molten metal and the throttle of the riser inhibits the outflow of molten metal. When a constant overpressure has built up inside the metering furnace, the riser throttle can be considered as a metering orifice that allows a substantially constant stream of material to pass through. However, before it comes to this constant flow of material, there is Transient effects of the material flow, which depend on many parameters, which can not be kept constant. In the course of the transient process, there are fluctuations in the material flow, which can range up to overshoots. The size of the
Schwankungen kann sich von Mal zu Mal des Betriebs des Dosierofens ändern, was die genaue Dosierung der abgegebenen Metallschmelzportionen erschwert und ungenau macht .Fluctuations may change from time to time as the dosing furnace operates, which makes precise metering of the delivered molten metal portions difficult and inaccurate.
Der Erfindung liegt die Aufgabe zugrunde, die aufgezeigten Mängel zu vermeiden. Insbesondere soll ein Steigrohr angegeben werden, mit dem sich die Einschwingvorgänge bei der Abgabe einer Metallschmelzportion glätten lassen und praktisch einen aperiodischen Verlauf zeigen. Die Reinigung des Steigrohrs soll zu gleichbleibender Güte der geometrischen Form führen.The invention has for its object to avoid the identified shortcomings. In particular, a riser is to be specified, with which the transient phenomena can be smooth in the delivery of a molten metal portion and show a virtually aperiodic course. The cleaning of the riser should lead to consistent quality of the geometric shape.
Die gestellte Aufgabe wird mit einem Steigrohr gelöst, dessen Innenoberfläche zwischen Drosselabschnitt,The object is achieved with a riser whose inner surface between throttle section,
Diffusorabschnitt und Rohrabschnitt ohne Kantenbildung glatt ineinander übergehen, wobei eine stetige Änderung der Zunahme des Innendurchmessers im Bereich des Diffusorabschnitts erfolgt. Demnach bildet die mathematische erste Ableitung df(x)/dx der Funktion f(x) des Innendurchmessers des Steigrohrs als Funktion der Strecke x entlang der Symmetrieachse, eine stetige Funktion, d.h. eine Funktion ohne Sprünge.Diffuser section and pipe section smoothly merge into one another without edge formation, wherein a constant change in the increase of the inner diameter in the region of the diffuser section takes place. Thus, the mathematical first derivative df (x) / dx of the function f (x) of the inside diameter of the riser as a function of the distance x along the axis of symmetry, constitutes a continuous function, i. a function without jumps.
Im Einzelnen geht der einlaufseitige Drosselabschnitt kantenlos, mit einem ersten Abrundungsradius in den Diffusorabschnitt über, und der Diffusor geht kantenlos, mit einem zweiten Abrundungsradius in den Rohrabschnitt über. Die Abrundungsradien sind groß gegenüber dem Einlaufdurchmesser oder dem Auslaufdurchmesser gewählt. „Groß" bedeutet hier „um nahezu eine Größenordnung oder darüber hinaus größer" .In detail, the inlet-side throttle section merges into the diffuser section without edges, with a first rounding radius, and the diffuser merges into the pipe section without edges, with a second rounding radius. The radii of curvature are chosen to be large compared to the inlet diameter or the outlet diameter. "Big" here means "almost an order of magnitude or more, larger".
Steigrohre sind Austauschteile, die einerseits wegen Abnutzung ausgetauscht werden, andererseits beiRiser pipes are replacement parts which are exchanged on the one hand for wear and tear, on the other hand
Produktionswechsel der Druckgusswerkstücke. Um innerhalb eines bestimmten Zeitrahmens eine bestimmte Metallschmelzportion abzugeben, wird ein Steigrohr passenden Kalibers aus einem Satz von Steigrohren ausgewählt und in den Dosierofen eingesetzt. Der Satz von Steigrohren unterschiedlichen Kalibers deckt den Gesamtbereich der Metallschmelzströme des betreffenden Dosierofens ab.Production change of die-cast workpieces. In order to dispense a particular molten metal portion within a certain time frame, a riser tube of appropriate caliber is selected from a set of riser tubes and inserted into the dosing furnace. The set of risers of different caliber covers the total range of molten metal flows of the respective dosing furnace.
Ausführungsbeispiele der Erfindung werden anhand der Zeichnung beschrieben. Dabei zeigt:Embodiments of the invention will be described with reference to the drawing. Showing:
Fig. 1 einen Dosierofen in schematisierter Darstellung bei entfernten Außenteilen, , Fig. 2 eine Teilansicht des Innenraums eines Dosierofens, Fig. 3 ein Diagramm des Massenstromes über die Zeit eines konventionellen Steigrohres, Fig. 4 ein Diagramm des Massenstromes über die Zeit bei einem erfindungsgemäßen Steigrohr, Fig. 5 einen Längsschnitt durch ein Steigrohr,2 shows a partial view of the interior of a metering furnace, FIG. 3 shows a diagram of the mass flow over the time of a conventional riser, FIG. 4 shows a diagram of the mass flow over time in an inventive Riser, Fig. 5 is a longitudinal section through a riser,
Fig. 6 einen Längsschnitt durch ein weiteres Steigrohr und Fig. 7 ein Reinigungswerkzeug zum Reinigen von Steigrohren.6 shows a longitudinal section through a further riser pipe and FIG. 7 shows a cleaning tool for cleaning riser pipes.
Fig. 1 ist eine schematische Darstellung des Innenraums eines Dosierofens. Dieser enthält ein innen feuerfest ausgekleidetes Gehäuse 1, das eine Wanne für die Metallschmelze bildet, ferner ein Füllrohr 2 zur Zuführung der Metallschmelze in die Wanne, ein Steigrohr 3 zur Abgabe von Metallschmelzportionen und eine Druckzuführungseinrichtung 4 zur Erzeugung eines Überdrucks im Inneren des Dosierofens, um jeweilsFig. 1 is a schematic representation of the interior of a metering furnace. This includes an inner refractory lined housing 1, which forms a trough for the molten metal, a filling tube 2 for supplying the molten metal into the trough, a riser pipe 3 for dispensing molten metal portions and a pressure supply device 4 for generating an overpressure inside the dosing oven, respectively
Metallschmelzportionen am Steigrohr 3 abzugeben. Das Niveau der Schmelze im Dosierofen ist durch eine Ebene 5 angedeutet. Das Füllrohr 2 besteht aus Keramik oder Feuerbeton und bildet einen sich verengenden Trichter mit engem Auslass, der beim Betrieb des Dosierofens einen Verschluss für den im Inneren erzeugten Überdruck bildet, andererseits das Nachströmen von Metallschmelze in die Wanne zulässt. Der Betrieb des Dosierofens erfolgt stoßweise, d. h. zur Abgabe einer Metallschmelzportion am Steigrohr 3 wird während einer bestimmten Zeit, beispielsweise für 8 Sekunden, ein Überdruck erzeugt, der zur Förderung einer Metallschmelzportion durch das Steigrohr 3 in die Füllkammer beispielsweise einer Aluminiumdruckgussmaschine dient. Die angewendeten Drücke liegen im Bereich von 10 mbar bis 200 mbar und vorzugsweise im Bereich von 40 bis 80 mbar. Um diese Drücke aufzubauen, muss das Steigrohr 3 als temporärer Verschluss wirken, d. h. der Aufbau des Druckes erfolgt wesentlich rascher als der mögliche Abfluss von Material durch das Steigrohr 3.Dispense molten metal portions on the riser pipe 3. The level of the melt in the metering furnace is indicated by a level 5. The filling tube 2 is made of ceramic or refractory concrete and forms a narrowing funnel with a narrow outlet, which forms a closure for the overpressure generated in the interior during operation of the metering furnace, on the other hand allows the inflow of molten metal into the tub. The operation of the metering furnace is intermittent, d. H. for delivery of a molten metal portion on the riser pipe 3, an overpressure is generated during a certain time, for example for 8 seconds, which serves to convey a molten metal portion through the riser pipe 3 into the filling chamber, for example, an aluminum die-casting machine. The applied pressures are in the range of 10 mbar to 200 mbar and preferably in the range of 40 to 80 mbar. To build up these pressures, the riser 3 must act as a temporary closure, i. H. the construction of the pressure is much faster than the possible outflow of material through the riser. 3
Fig. 2 zeigt den prinzipiellen Aufbau eines Steigrohres 3. Die Wandung des Steigrohrs besteht aus Keramik oder Feuerbeton. Das Steigrohrinnere 30 enthält drei Abschnitte, nämlich einen einlaufseitigen Drosselabschnitt 31, einen Verbindungsdiffusorabschnitt 32 und einen auslaufseitigen Rohrabschnitt 33. Die Drossel 31 verzögert den Abfluss der Metallschmelze bei Druckaufbau in dem Gehäuse 1, so dass man mittels der Druckzuführungseinrichtung 4 eine gewünschte Höhe des Überdrucks im Gehäuse 1 einstellen kann. Alsdann wirkt die Drossel 31 als Messblende, d. h. bei eingestelltem, konstantem Druck fließt ein in etwa konstanter Strom durch das Steigrohr 3. Bevor es jedoch zu diesem konstanten, geförderten Strom kommt, muss der Strom vom Wert Null auf den gewünschten Wert angestoßen werden, wobei es zu Einschwingvorgängen kommen kann. Fig. 3 zeigt das Verhalten des Massenstroms bei einem konventionellen Steigrohr der Kalottenform. Es bilden sich Überschwingvorgänge heraus, bevor sich der in etwa konstante Massenstrom ergibt. Demgegenüber zeigt Fig. 4 das Verhalten des Massenstroms bei einem erfindungsgemäßen Steigrohr. Wie deutlich sichtbar, verläuft der Einschwingvorgang praktisch aperiodisch, d. h. es treten keine Überschwingvorgänge auf.Fig. 2 shows the basic structure of a riser 3. The wall of the riser is made of ceramic or refractory concrete. The riser interior 30 includes three sections, namely an inlet side throttle section 31, a Verbindungsdiffusorabschnitt 32 and an outlet side pipe section 33. The throttle 31 delays the outflow of the molten metal at pressure buildup in the housing 1, so that by means of the pressure supply means 4 a desired level of overpressure in Can adjust housing 1. Then, the throttle 31 acts as a metering orifice, that is, when set, constant pressure flows in an approximately constant current through the riser. 3 However, before this constant, subsidized current comes, the current must be triggered by the value zero to the desired value, which can lead to transient processes. Fig. 3 shows the behavior of the mass flow in a conventional riser of the dome shape. Overshoot processes are formed before the roughly constant mass flow results. In contrast, Fig. 4 shows the behavior of the mass flow in a riser according to the invention. As clearly visible, the transient process is practically aperiodic, ie there are no overshoots.
Die Ausbildung des erfindungsgemäßen Steigrohrs wird anhand der Fig. 5 und 6 beschrieben. Das Steigrohrinnere 30 ist durch eine Schlichtbearbeitung geglättet. Es können die drei Abschnitte Drossel 31, Diffusor 32 und Rohrabschnitt 33 unterschieden werden, deren Längen mit L31 bzw. L32 bzw. L33 gekennzeichnet sind. Der Einlaufdurchmesser ist mit Di und der Auslaufdurchmesser mit Do bezeichnet. Der Außendurchmesser des Steigrohrs beträgt Da. DerThe formation of the riser according to the invention will be described with reference to FIGS. 5 and 6. The riser interior 30 is smoothed by a finishing treatment. The three sections throttle 31, diffuser 32 and pipe section 33 can be distinguished, the lengths of which are marked L31, L32 and L33. The inlet diameter is denoted by Di and the outlet diameter by Do. The outer diameter of the riser is Da. Of the
Drosselabschnitt 31 ist rundzylindrisch und geht kantenlos mit einem Abrundungsradius Rl in den konischen Diffusorabschnitt 32 über. Der Rohrabschnitt 33 ist mit einem Öffnungswinkel von 1° zum Auslauf hin leicht konisch und geht kantenlos mit einem Abrundungsradius R2 in den Diffusorabschnitt 32 über. Die inneren Schnittlinien im axialen Längsschnitt durch das Steigrohr 3 sind stetig differenzierbar und sind im Diffusorabschnitt 32 allgemein S-förmig. Die Radien Rl und R2 können so gewählt werden, dass die mit ihnen erzeugten Rundungen, welche Teile von Torusflächen darstellen, tangential ineinander übergehen, d. h. im axialen Schnitt einen Wendepunkt bilden, an welchem der maximale Konusöffnungswinkel α des Diffusorabschnitts 32 gemessen werden kann. Es ist aber auch möglich, eine Konusfläche des Winkels α mit geraden Mantellinien zu bilden, die tangential in die durch die Radien R1, R2 gebildeten Torusflachen übergehen. Die Außenform des Steigrohres 3 kann abgerundet oder, wie dargestellt, kantig sein. Jedoch sollte eingangsseitig beim Übergang der Außenfläche zur Innenfläche des Steigrohres eine scharfe Umlaufkante 34 vorgesehen sein, und ausgangsseitig sollte keine „Stolperkante" zu einem weiterführenden Rohr gegeben sein, was eine weitere scharfe Umlaufkante 35 bedingt.Throttle portion 31 is round cylindrical and merges without edges with a rounding radius Rl in the conical diffuser section 32. The tube section 33 is slightly conical with an opening angle of 1 ° to the outlet and merges edgewise with a rounding radius R2 into the diffuser section 32. The inner cutting lines in the axial longitudinal section through the riser pipe 3 are continuously differentiable and are generally S-shaped in the diffuser section 32. The radii R1 and R2 can be chosen so that the curves generated by them, which are parts of torus surfaces, tangentially merge into each other, ie form an inflection point in axial section, at which the maximum cone opening angle α of the diffuser section 32 can be measured. But it is also possible to form a conical surface of the angle α with straight generatrices that merge tangentially into the Torusflachen formed by the radii R 1 , R 2 . The outer shape of the riser pipe 3 may be rounded or, as shown, be edged. However, on the input side should be provided at the transition of the outer surface to the inner surface of the riser a sharp peripheral edge 34, and the output side should be no "tripping edge" given to a secondary pipe, which requires a further sharp peripheral edge 35.
Steigrohre gibt es unter anderem mit einer Gesamtlänge L von 570 mm. Zu den Nenngrößen bei Steigrohren zählt noch der Außendurchmesser Da sowie die Innendurchmesser Do und Di am Auslass und Einlass des Steigrohres. Ausgehend von einer Gesamtlänge L = 570 mm liegt der Außendurchmesser Da im Bereich von 65 bis 130 mm. Der Auslassdurchmesser Do liegt im Bereich von 40 bis 80 mm und der Einlassdurchmesser Di im Bereich von 12 bis 40 mm. Es versteht sich, dass die jeweils kleineren Werte der Durchmesser miteinander und die jeweils größeren Durchmesser miteinander kombiniert sind.Riser pipes are available with a total length L of 570 mm. The nominal sizes of riser pipes include the outer diameter Da as well as the inner diameters Do and Di at the outlet and inlet of the riser. Starting from a total length L = 570 mm, the outer diameter Da is in the range of 65 to 130 mm. The outlet diameter Do is in the range of 40 to 80 mm and the inlet diameter Di is in the range of 12 to 40 mm. It is understood that the respective smaller values of the diameters are combined with each other and the respective larger diameters.
Bei dem in Fig. 5 dargestellten Steigrohr beträgt der Auslassdurchmesser Do = 40 mm, und der EinlassdurchmesserIn the riser shown in Fig. 5, the outlet diameter Do = 40 mm, and the inlet diameter
Di = 16 mm, während L31 = 15 mm und L32 = 55 mm betragen.Di = 16 mm, while L31 = 15 mm and L32 = 55 mm.
Die Abrundungsradien betragen Rl = 150 mm und R2 = 250 mm.The radii of curvature are Rl = 150 mm and R2 = 250 mm.
Der maximale Öffnungswinkel α des Diffusors 32 beträgt etwaThe maximum opening angle α of the diffuser 32 is approximately
10°. Für die Ausführungsform nach Fig. 6 ergeben sich folgende10 °. For the embodiment of FIG. 6, the following results
Werte :Values :
L = 570 mm; Da = 120 mm; Do = 65 mm; Di = 21 mm;L = 570 mm; Da = 120 mm; Do = 65 mm; Di = 21 mm;
L31 = 20 mm; L32 = 105 mm; Rl = 150 mm; R2 = 250 mm, α = 14°. Von den angegebenen Werten kann abgewichen werden. So braucht der Drosselabschnitt 31 nicht streng zylindrisch zu sein, vielmehr ist eine leicht konische Form zulässig. Der in Achsrichtung gemessene Wandwinkel im Drosselabschnitt kann im Bereich von 0 bis 1° gewählt werden. Auch für den Konusöffnungswinkel des Diffusors 32 gibt es einen bevorzugten Bereich, der von 8° bis 16° reicht. Für den Rohrabschnitt 33 wird ein Wandwinkel im Bereich von 0,5° bis 2° gewählt, was die Reinigung des Steigrohres von fest gewordener Metallschmelze erleichtert. Der erste Abrundungsradius Rl ist vorzugsweise größer als 30 mm und kann im Bereich von 100 bis 200 mm liegen und der zweite Abrundungsradius R2 ist vorzugsweise größer als 50 mm und kann im Bereich von 200 bis 300 mm gewählt werden.L31 = 20 mm; L32 = 105 mm; R1 = 150 mm; R2 = 250 mm, α = 14 °. You can deviate from the given values. Thus, the throttle portion 31 does not need to be strictly cylindrical, but a slightly conical shape is permissible. The measured in the axial direction wall angle in the throttle section can be selected in the range of 0 to 1 °. Also, for the cone opening angle of the diffuser 32, there is a preferred range ranging from 8 ° to 16 °. For the pipe section 33, a wall angle in the range of 0.5 ° to 2 ° is selected, which facilitates the cleaning of the riser of solidified molten metal. The first rounding radius R1 is preferably greater than 30 mm and may be in the range of 100 to 200 mm and the second rounding radius R2 is preferably greater than 50 mm and may be selected in the range of 200 to 300 mm.
Infolge der Geometrie des neuen Steigrohres und den bei Dosieröfen üblichen Förderdrücken wird eine laminare Strömung im Steigrohrinneren erzielt, was dazu führt, dass die Größe des Stromes bei dem neuen Steigrohr erhöht ist. Während beispielsweise ein Standardsteigrohr in Kalottenform der Nenngröße 570 x 85 / 65 x 21 (L x Da / Do x Di) einen Massestrom von knapp 100 kg/min bei 60 mbar Förderdruck aufweist, zeigt das neue strömungsoptimierte Steigrohr mit den gleichen Nennmaßen bei gleichemDue to the geometry of the new riser pipe and the usual in metering furnaces feed a laminar flow in the riser interior is achieved, which means that the size of the stream is increased in the new riser. For example, while a standard riser in the form of a dome with a nominal size of 570 x 85/65 x 21 (L x Da / Do x Di) has a mass flow of just under 100 kg / min at a discharge pressure of 60 mbar, the new flow-optimized riser with the same nominal dimensions will show the same
Förderdruck einen Massenstrom von 120 kg/min. Es darf angenommen werden, dass diese Erhöhung der Stromrate und das verbesserte Einschwingverhalten auf die Vermeidung von Wirbelbildungen bzw. Turbulenzen in den einzelnen Abschnitten (Drossel, Diffusor, Rohrabschnitt) innerhalb des erfindungsgemäßen Steigrohrs zurückzuführen ist.Delivery pressure a mass flow of 120 kg / min. It may be assumed that this increase in the flow rate and the improved transient response to the avoidance of vortices or turbulence in the individual sections (throttle, diffuser, pipe section) is due within the riser pipe according to the invention.
Bei einem Dosierofen gibt es einen Gesamtbereich von abgemessenen Portionen, der üblicherweise mit einem Satz von Steigrohren unterschiedlichen Kalibers abgedeckt wird. Indem das neue strömungsoptimierte Steigrohr einen erhöhten Durchsatz zeigt, kann man den Gesamtbereich der abzumessenden Portionen mit weniger Steigrohren in dem Satz abdecken als bisher. Bei einem Dosierofen marktüblicher Größe kann man mit fünf Steigrohren (statt bisher sieben oder acht Steigrohren) in dem Satz auskommen, die folgende Abmessungen aufweisen:A metering furnace has a total range of metered portions that is usually covered with a set of risers of different calibers. By the new flow-optimized riser shows an increased throughput, you can cover the entire area of the portions to be measured with fewer risers in the sentence than before. In a dosing furnace of commercial size can be with five risers (instead of previously seven or eight risers) get along in the sentence, which have the following dimensions:
Nr. Gesamtlänge max. Außenmax. InnenEinlauf(L) durchmesdurchmesdurchser (Da) ser (Do) messer (Di)No. Overall length max. Außenmax. Inside inlet (L) through diameter (Da) ser (Do) knife (Di)
1 570 90 40 161 570 90 40 16
2 570 120 65 212 570 120 65 21
3 570 120 65 243 570 120 65 24
4 570 120 65 354 570 120 65 35
5 570 120 65 405 570 120 65 40
Nr. Länge der erster zweiter Länge des Drossel Abrundungs- Abrundungs- Diffusors (L31) radius (Rl) radius (R2) etwaNo. Length of the first second length of the throttle rounding rounding diffuser (L31) radius (Rl) radius (R2) approx
1 15 150 250 551 15 150 250 55
2 20 150 250 1052 20 150 250 105
3 25 150 250 1003 25 150 250 100
4 35 150 250 904 35 150 250 90
5 40 150 250 855 40 150 250 85
Beim Gebrauch der Steigrohre 3 setzt sich Schmelze an den Rohrwandungen fest, die einen unerwünschten Überzug des Rohrinneren 30 ergeben. Deshalb wird solcher Überzug von Zeit zu Zeit entfernt, was mit einem in Fig. 7 dargestellten Werkzeug 7 geschehen kann. Dieses weist eine Stange 70 mit Griff 71 und einem Schaber 72 auf, der als Halbrundscheibe mit einem Radius passend zum Einlaufdurchmesser des betreffenden Steigrohrs 3 ausgebildet ist. Auch der Durchmesser der Stange 70 kann in Abhängigkeit von der Steigrohrgröße passend gewählt werden. Da das Innere 30 des Steigrohres kantenlos ist, wird die Gefahr des heftigen Anschlagens des Schabers 72 am Rohrwandinneren infolge Trägheitskräften beim Richtungswechsel an Kanten vermieden, so dassWhen using the riser pipes 3 melt is fixed to the pipe walls, which give an undesirable coating of the tube interior 30. Therefore, such a coating is removed from time to time, which corresponds to one in Fig. 7 shown tool 7 can be done. This has a rod 70 with handle 71 and a scraper 72 which is formed as a half-round disc with a radius matching the inlet diameter of the respective riser pipe 3. Also, the diameter of the rod 70 can be selected as a function of the riser size. Since the interior 30 of the riser is edgeless, the risk of violent abutment of the scraper 72 on the pipe wall interior due to inertial forces in the direction change is avoided at edges, so that
Beschädigungen der Rohrinnenwand beim Reinigen des Steigrohrs weitgehend vermieden werden.Damage to the pipe inner wall when cleaning the riser are largely avoided.
Statt einer Halbrundscheibe als Schaber 72 kann auch ein ahlenartiger Formschaber benutzt werden, der an die S- förmige Krümmung je eines Steigrohrinneren 30 angepasst ist, um die gewünschte Geometrie des Steigrohrinneren bei jedem Reinigungsvorgang immer wieder herauszuarbeiten. Instead of a half-round disc as a scraper 72 and a Ahlenartiger forming scraper can be used, which is adapted to the S-shaped curvature of each one riser interior 30 to work out the desired geometry of the riser inside each time cleaning process again.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL08829753T PL2193001T3 (en) | 2007-09-07 | 2008-10-31 | Rising pipe for delivering molten metal and dosing furnace with such a rising pipe |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007042537A DE102007042537B4 (en) | 2007-09-07 | 2007-09-07 | Dosing furnace and riser for the delivery of molten metal |
| PCT/EP2008/009212 WO2009030513A2 (en) | 2007-09-07 | 2008-10-31 | Dosing furnace and rising pipe for delivering molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2193001A2 true EP2193001A2 (en) | 2010-06-09 |
| EP2193001B1 EP2193001B1 (en) | 2012-06-27 |
Family
ID=40367016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08829753A Active EP2193001B1 (en) | 2007-09-07 | 2008-10-31 | Rising pipe for delivering molten metal and dosing furnace with such a rising pipe |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2193001B1 (en) |
| DE (1) | DE102007042537B4 (en) |
| ES (1) | ES2389977T3 (en) |
| PL (1) | PL2193001T3 (en) |
| WO (1) | WO2009030513A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010044916A1 (en) * | 2010-09-09 | 2012-03-15 | Thermat Industrieofen Gmbh | Funnel type filling pipe for compressed gas-operated dosing oven, has clamp that is inserted into hole provided in the nonferrous metal structure with flat gasket |
| CN105834399B (en) * | 2016-04-11 | 2017-12-15 | 南通大学 | A kind of composite low-pressure casting stalk and preparation method thereof |
| CN107931568A (en) * | 2016-10-12 | 2018-04-20 | 福建省瑞奥麦特轻金属有限责任公司 | A kind of stalk for low pressure casting |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1262433B (en) * | 1964-02-13 | 1968-03-07 | Licentia Gmbh | Device for casting aluminum cage windings for large electric motor runners |
| DE10130354C1 (en) * | 2001-06-23 | 2003-01-23 | Thyssenkrupp Stahl Ag | Immersion tube used for casting molten metal comprises a tubular section extending from a filling opening for the molten metal, a funnel chamber connected to the tubular section, a removal stream opening, and a collision shoulder |
| US7431069B2 (en) * | 2004-10-16 | 2008-10-07 | Fu Shun Liang | Method and apparatus for metal casting |
| WO2006092163A2 (en) * | 2005-02-28 | 2006-09-08 | Oischinger Apparatebau Gmbh | Metering oven |
| DE202005017110U1 (en) | 2005-10-27 | 2006-02-16 | Strikowestofen Gmbh | Riser pipe for metering liquid metal comprises an inlet which conically tapers toward a nozzle |
-
2007
- 2007-09-07 DE DE102007042537A patent/DE102007042537B4/en active Active
-
2008
- 2008-10-31 WO PCT/EP2008/009212 patent/WO2009030513A2/en not_active Ceased
- 2008-10-31 PL PL08829753T patent/PL2193001T3/en unknown
- 2008-10-31 ES ES08829753T patent/ES2389977T3/en active Active
- 2008-10-31 EP EP08829753A patent/EP2193001B1/en active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009030513A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007042537B4 (en) | 2009-06-10 |
| DE102007042537A1 (en) | 2009-04-02 |
| WO2009030513A3 (en) | 2009-07-02 |
| WO2009030513A2 (en) | 2009-03-12 |
| PL2193001T3 (en) | 2012-11-30 |
| ES2389977T3 (en) | 2012-11-05 |
| EP2193001B1 (en) | 2012-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE702638C (en) | Device for continuous casting of metal pipes | |
| EP2193001B1 (en) | Rising pipe for delivering molten metal and dosing furnace with such a rising pipe | |
| DE2304515C3 (en) | Medium-tight closure device at the outlet end of a vulcanizing tube of an extruder for insulating electrical conductors | |
| DE4322316C1 (en) | Infeed system for an aluminum continuous casting plant | |
| DE29722779U1 (en) | Outlet device to a crucible | |
| DE102013018281B4 (en) | Volumetric dosing unit | |
| DE602004005084T2 (en) | Needle valve nozzle for filling a tool with a liquid organic material and method for producing an optical element using such a nozzle | |
| WO2004110681A1 (en) | Device for supplying casting installations with molten metal | |
| WO2017152904A2 (en) | Casting chamber of a cold chamber die-casting machine with a cooling device and cooling device | |
| DE60016598T2 (en) | DEVICE FOR HORIZONTAL CONTINUOUS GASING OF METAL | |
| DE3050939C2 (en) | ||
| DE2220793A1 (en) | Feed pipe socket for a pipeline as well as a method for the transport of liquids | |
| EP3519124B1 (en) | Method for multiple casting of metal strengths | |
| DE726599C (en) | Process for encapsulating tubular bodies | |
| EP3705203A1 (en) | Method of manufacturing a cast metal fitting and corresponding fitting | |
| EP4496671B1 (en) | Valve device of a dosing device for dosing liquid metals | |
| DE202009006969U1 (en) | Apparatus for weight-constant portioning of molten glass | |
| WO2020011444A1 (en) | Method for strand casting, especially in a vertical casting plant for casting steel | |
| AT208577B (en) | Die for the extrusion of thermoplastic resins or the like. | |
| EP0726113A1 (en) | Inflow system for a continuous aluminium casting installation | |
| DE130852C (en) | ||
| DE800321C (en) | Process for centrifugal casting of conical hollow bodies | |
| DE102004006839B4 (en) | Feeding device for material to be machined by automatic lathes or the same machine tools | |
| DE10211539A1 (en) | Pressure drawing tool, used for drawing wires, rods and profiles, has a drawing core made from one piece with a drawing hole with a funnel-shaped entry zone, a pressure build-up zone, an entry area, a shaping zone, a guiding length, etc. | |
| DE10226827B4 (en) | Device for producing glass strands |
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 |
|
| 17P | Request for examination filed |
Effective date: 20100218 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
|
| 17Q | First examination report despatched |
Effective date: 20110622 |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| RIC1 | Information provided on ipc code assigned before grant |
Ipc: B22D 18/04 20060101ALI20111201BHEP Ipc: B22D 35/04 20060101ALI20111201BHEP Ipc: F27B 17/00 20060101ALI20111201BHEP Ipc: B22D 17/28 20060101AFI20111201BHEP Ipc: F27B 14/08 20060101ALI20111201BHEP Ipc: F27D 3/14 20060101ALI20111201BHEP |
|
| RTI1 | Title (correction) |
Free format text: RISING PIPE FOR DELIVERING MOLTEN METAL AND DOSING FURNACE WITH SUCH A RISING PIPE |
|
| DAX | Request for extension of the european patent (deleted) | ||
| GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 563868 Country of ref document: AT Kind code of ref document: T Effective date: 20120715 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 502008007618 Country of ref document: DE Effective date: 20120823 |
|
| RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: STRIKOWESTOFEN GMBH |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NO 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: 20120927 Ref country code: LT 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: 20120627 Ref country code: SE 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: 20120627 Ref country code: FI 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: 20120627 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2389977 Country of ref document: ES Kind code of ref document: T3 Effective date: 20121105 |
|
| REG | Reference to a national code |
Ref country code: NL Ref legal event code: VDEP Effective date: 20120627 |
|
| REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D Effective date: 20120627 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LV 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: 20120627 Ref country code: GR 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: 20120928 Ref country code: SI 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: 20120627 Ref country code: HR 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: 20120627 |
|
| REG | Reference to a national code |
Ref country code: PL Ref legal event code: T3 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY 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: 20120627 Ref country code: RO 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: 20120627 Ref country code: CZ 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: 20120627 Ref country code: EE 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: 20120627 Ref country code: SK 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: 20120627 Ref country code: IS 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: 20121027 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT 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: 20121029 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL 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: 20120627 |
|
| BERE | Be: lapsed |
Owner name: STRIKOWESTOFEN G.M.B.H. Effective date: 20121031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK 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: 20120627 |
|
| 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 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| 26N | No opposition filed |
Effective date: 20130328 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20121031 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 502008007618 Country of ref document: DE Effective date: 20130328 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 Ref country code: BG 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: 20120927 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT 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: 20120627 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR 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: 20120627 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU 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: 20081031 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 8 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 9 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20161025 Year of fee payment: 9 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20161024 Year of fee payment: 9 Ref country code: PL Payment date: 20161019 Year of fee payment: 9 Ref country code: ES Payment date: 20161025 Year of fee payment: 9 |
|
| REG | Reference to a national code |
Ref country code: AT Ref legal event code: MM01 Ref document number: 563868 Country of ref document: AT Kind code of ref document: T Effective date: 20171031 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20180629 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20171031 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20171031 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20181226 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20171101 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20171031 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20241028 Year of fee payment: 17 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20241031 Year of fee payment: 17 |