EP1213070B1 - Metallgiessverfahren und -vorrichtung - Google Patents
Metallgiessverfahren und -vorrichtung Download PDFInfo
- Publication number
- EP1213070B1 EP1213070B1 EP01126259A EP01126259A EP1213070B1 EP 1213070 B1 EP1213070 B1 EP 1213070B1 EP 01126259 A EP01126259 A EP 01126259A EP 01126259 A EP01126259 A EP 01126259A EP 1213070 B1 EP1213070 B1 EP 1213070B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filling
- level
- metal
- melting furnace
- mould
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
Definitions
- the invention relates to a metal casting method and a metal casting device, especially according to the low pressure casting principle for series production of aluminum castings, according to the preamble of claim 1 or 6.
- the melting furnace must be in front of everyone Mold filling process, but also depressurized for refilling the weld pool and the actual casting process is interrupted during this time, which increased downtime and a corresponding decrease in average Production rate.
- the main problem is that due to the refilling process, there is an increased gas absorption and formation of oxide skin in the melt and highly undesirable corundum deposits in the oven and thereby a loss of quality to the Castings that come in terms of strict quality requirements, such as they are placed on aluminum castings in the automotive industry, cannot be accepted.
- the object of the invention is the method and the device of the beginning the type mentioned so that the mentioned, refill-related impurities of the weld pool can be significantly reduced.
- this object is characterized by that in claim 1 Method or the casting device characterized in claim 6 solved.
- the metal level in the filling tube is for the duration of the refilling process regardless of the degree of filling of the furnace at or above the level the end of the riser pipe, i.e. clearly above the metal level in the Melting furnace, and thus the free fall height of the melt at Refilling significantly reduced, with the result that oxide skin formation and gas absorption of the molten metal due to the largely swirl-free Melt entry as well as by spraying metal particles caused corundum formation are effectively suppressed and thereby ensured is that the weld pool in the furnace and consequently also the Metal filling of the mold of disruptive contaminants, such as gas, oxide skin or corundum inclusions, kept free and the casting quality significant is improved.
- the metal mirror in Filling tube according to claim 2 with regard to a simple level control during the refill phase through a gas pressure control that is dependent on the fill level signal of the filling tube furnace system to the specified level.
- the metal melt during the mold filling process under low pressure from the melting furnace into one with the riser selectively coupled mold so the filling tube is particularly preferably kept constantly under ambient pressure and the gas pressure in the melting furnace between the mold filling phases continuously on one Metal mirror in the filler pipe at the level of the riser outlet area on the mold side maintaining overpressure value adjusted.
- the level measurement in the filling tube according to claim 4 preferably also Monitoring and control of the melt rise in the mold up to Reaching the upper mold filling limit and thus the otherwise to this Purpose required, separate level measurement directly on the casting mold made unnecessary.
- the gas pressure above the metal level in the fill pipe is dependent on a fill level signal operated, on the one hand with the ambient pressure and on the other hand controlled with the furnace pressure 3-way valve so that the filling level in the filling pipe is only for the duration of the refilling phase Height of the riser outlet area brought, but otherwise to the metal bath level the furnace is lowered.
- This variant also has the thermal advantage that by lowering the molten metal in the filling pipe between the refill phases is easily prevented that the liquid metal in the The filling pipe cools down too much and then precipitates on the inside of the filling pipe.
- the casting plant shown in Fig. 1 is used for the production of aluminum castings according to the low pressure process and contains a melting furnace 2 with an immersion in the melt pool 4, which protrudes beyond the furnace top Riser pipe 6 for filling one selectively with the upper, funnel-shaped extended riser pipe end coupling mold 8 as well as with a likewise in the metal bath 4 immersed filling tube 10, which at the top, on the Filling upper limit A of the mold 8 protruding end through a cover 12 is closed with a refill and vent opening 14.
- the gas pressure inside the furnace is identified with the help of a total of 16 Regulated gas pressure control, which from a pressure gas container 18, a reversible between this and a vent and a closed position Multi-way valve 20, a control unit 22 for valve actuation and a measuring the height level of the liquid metal column in the filling tube 10, Level sensor 24 connected on the output side to control unit 22 there, the level in the riser 6 and in the mold 8 after the principle of communicating tubes at the same height as in the filling tube 10 lies and is therefore also detected by the sensor signal.
- Regulated gas pressure control which from a pressure gas container 18, a reversible between this and a vent and a closed position Multi-way valve 20, a control unit 22 for valve actuation and a measuring the height level of the liquid metal column in the filling tube 10, Level sensor 24 connected on the output side to control unit 22 there, the level in the riser 6 and in the mold 8 after the principle of communicating tubes at the same height as in the filling tube 10 lies and is therefore also detected by the sensor
- the casting plant shown in Fig. 1 operates as follows: Outside the actual one Form filling phases, i.e. when changing the mold 8, the gas pressure in the melting furnace 2, controlled by sensor signals, set so high that the Metal mirror in the filling pipe 10 and thus also in the riser pipe 6 at the level B of the mold-side riser outlet area is held. This State is shown in Fig. 1.
- the gas pressure in the furnace 2 is increased so that the Casting mold 8 is increasingly filled, the rate of increase of Melt from the control unit 22 with the aid of the level signal from the sensor 24 is monitored until the sensor 24 indicates that the upper mold filling limit A is reached, whereupon the furnace pressure after a predetermined cooling time the mold 8 again to the level B corresponding to the level Pressure value is lowered and the casting can be removed from the mold.
- a refill of melt is e.g. out a transport pan 28 which can be moved next to the furnace 2 and from which the melt with the help of a gas cartridge 30 via an insertable into the refill opening 14
- Connection pipe 32 is conveyed into the filling pipe 10 at any time without interruption of the mold-side workflow possible, the free head the melt very much because of the raised filling level in the filling tube 10 is kept low.
- the compressed gas control 16 ensures in the refill phase for a level signal-dependent readjustment of the furnace pressure, such that only the degree of filling of the melting furnace 2 increases program-guided height level control in the filling pipe 10 and in the riser pipe 6 or the mold 8 is retained unchanged
- the main difference is a modified gas pressure control 116, through which the liquid metal columns in the filling pipe 110 on the one hand and in the riser pipe 106 and the mold 108, on the other hand, are regulated separately from one another become.
- the gas space at the upper end of the filling pipe is through the Lid 112 is closed in a pressure-tight manner and is connected to the interior of the oven via a the control unit 122 operated control valve 34, through which the Gas pressure in the filling pipe 110 is continuously between the full furnace internal pressure and the ambient pressure is adjustable.
- the gas pressure regulator 116 also contains an additional level sensor 36, the liquid metal level immediately on the riser 106 and on the mold 108.
- the casting process according to the level signal of the sensor system 36, but otherwise analog controlled to the first embodiment, i.e. the liquid metal column in the Riser pipe 106 is constantly at least up to height level B of the riser pipe region raised and is program-guided in the mold filling phase in the mold 108 pressed until the sensor 36 reaches reaching the top Indicates mold fill limit; on the part of the filling pipe 110, however, the gas pressure outside the refill phases via the control valve 34 to the pressure level set inside the furnace so that the metal mirror in the filling pipe 110 the fill level of the molten pool 104 is lowered (FIG.
- the filling tube furnace system can also be used within the scope of the invention be operated with an inert gas.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
- Fig. 1
- ein Ausführungsbeispiel einer erfindungsgemäßen Gießanlage im Schnitt; und
- Fig.2
- eine der Fig. 1 entsprechende Darstellung eines zweiten Ausführungsbeispiels der Erfindung.
Claims (6)
- Metallgießverfahren, insbesondere Niederdruck-Gießverfahren zur Serienfertigung von Aluminium-Gussteilen, bei dem die Metallschmelze aus einem über ein Füllrohr periodisch nachfüllbaren Schmelzeofen unter Zwischenschaltung eines in das Schmelzbad eintauchenden Steigrohrs in die Gießform eingebracht wird, dadurch gekennzeichnet, dass das Füllstandsniveau im Füllrohr in der Nachfüllphase des Schmelzeofens kontinuierlich gemessen und der Metallspiegel im Füllrohr für die Dauer des Nachfüllvorgangs nach Maßgabe des Füllstandssignals auf einer zumindest dem Höhenniveau des gießformseitigen Steigrohr-Auslassbereichs entsprechenden Füllstandshöhe gehalten wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Metallspiegel im Füllrohr durch eine füllstandssignalabhängige Gasdrucksteuerung des Füllrohr-Ofensystems während der Nachfüllphase auf der angegebenen Füllstandshöhe gehalten wird.
- Verfahren nach Anspruch 2, bei dem die Metallschmelze beim Formfüllvorgang unter Niederdruckwirkung aus dem Schmelzeofen in eine mit dem Steigrohr selektiv koppelbare Gießform gedrückt wird, dadurch gekennzeichnet, dass
das Füllrohr ständig unter Umgebungsdruck gehalten und der Gasdruck im Schmelzeofen zwischen den Formfüllphasen kontinuierlich auf einen den Metallspiegel im Füllrohr auf dem Höhenniveau des gießformseitigen Steigrohr-Auslassbereichs haltenden Überdruckwert eingeregelt wird. - Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass
das Erreichen des oberen Formfüllniveaus mit Hilfe der im Füllrohr gemessenen Füllstandshöhe bestimmt wird. - Verfahren nach Anspruch 2, bei dem die Metallschmelze beim Formfüllvorgang unter Niederdruckwirkung aus dem Schmelzeofen in eine mit dem Steigrohr selektiv koppelbare Gießform gedrückt wird, dadurch gekennzeichnet, dass
der Gasraum oberhalb des Metallspiegels im Füllrohr ventilgesteuert zwischen den Nachfüllphasen mit dem Gasdruck im Schmelzeofen beaufschlagt und für die Dauer des Nachfüllvorgangs nach Maßgabe des Füllstandssignals bis zum Anstieg des Füllrohr-Metallspiegels auf das Höhenniveau des gießformseitigen Steigrohr-Auslassbereichs druckentlastet wird. - Metallgießvorrichtung, insbesondere Niederdruck-Gießvorrichtung zur Serienfertigung von Aluminium-Gussteilen, miteinem ein Metallbad (4; 104) enthaltenden Schmelzeofen (2; 102),einem in das Metallbad im Schmelzeofen eintauchenden, die Metallschmelze an die Gießform (8; 108) überführenden Steigrohr (6; 106)einem ebenfalls in das Metallbad eintauchenden Füllrohr (10; 110) zum periodischen Nachfüllen des Schmelzeofens,einem den Schmelzestand im Füllrohr messenden Sensor (24; 124), undeiner sensorgesteuerten, den Metallspiegel im Füllrohr beim Nachfüllvorgang auf einer zumindest dem Höhenniveau (B) des gießformseitigen Steigrohr-Auslassbereichs entsprechenden Füllstandshöhe haltenden Gasdruckregelung (16; 116) für das Füllrohr-Ofensystem.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10061026A DE10061026A1 (de) | 2000-12-08 | 2000-12-08 | Metallgießverfahren und -vorrichtung |
DE10061026 | 2000-12-08 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1213070A2 EP1213070A2 (de) | 2002-06-12 |
EP1213070A3 EP1213070A3 (de) | 2003-01-29 |
EP1213070B1 true EP1213070B1 (de) | 2004-07-07 |
Family
ID=7666259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01126259A Expired - Lifetime EP1213070B1 (de) | 2000-12-08 | 2001-11-06 | Metallgiessverfahren und -vorrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1213070B1 (de) |
DE (2) | DE10061026A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012008458A1 (de) * | 2012-04-24 | 2013-10-24 | Adam Handerek | Reaktor zum Vergasen und/oder Reinigen eines Ausgangsmaterials |
CN113333715B (zh) * | 2021-05-28 | 2022-11-04 | 重庆长安汽车股份有限公司 | 基于背压力的低压铸造充型压力曲线设计方法 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE571806C (de) * | 1931-09-02 | 1933-03-06 | Aeg | Vorrichtung zur Herstellung von Kokillenguss durch Einfuehrung des fluessigen Metalles in die Kokille aus einem geschlossenen Schmelzkessel mittels Druckluft |
DE2128425A1 (de) * | 1970-08-21 | 1973-01-04 | Friedhelm Dipl Ing Kahn | Giessverfahren mit druckanwendung und einrichtung zur durchfuehrung des verfahrens |
BG22157A1 (de) * | 1975-10-27 | 1977-05-20 | ||
FR2382298A1 (fr) * | 1977-03-01 | 1978-09-29 | Renault | Dispositif de coulee de metal liquide a basse pression |
FR2605913A1 (fr) * | 1986-10-31 | 1988-05-06 | Pechiney Aluminium | Procede de moulage sous pression de pieces metalliques contenant eventuellement des fibres en ceramiques |
DE3924775C1 (de) * | 1989-07-26 | 1990-03-29 | Alcan Deutschland Gmbh, 3400 Goettingen, De | |
ATE166011T1 (de) * | 1992-11-20 | 1998-05-15 | Erana Agustin Arana | Vorrichtung zum giessen von nichteisenmetallen in sandformen mittels nachdruck |
DE4332760A1 (de) * | 1993-09-25 | 1995-03-30 | Klaus Doehrer | Verfahren zum Betreiben einer Niederdruckmetallgießvorrichtung und Niederdruckmetallgießvorrichtung dafür |
GB9323248D0 (en) * | 1993-11-11 | 1994-01-05 | Hi Tec Metals R & D Ltd | A casting apparatus and method |
JPH0743523U (ja) * | 1993-12-28 | 1995-08-22 | 東亜医用電子株式会社 | キュベット |
EP0970767A1 (de) * | 1998-05-07 | 2000-01-12 | Georg Fischer Disa A/S | Verfahren und Vorrichtung zum Giessen von Metallkörpern mit Gegenschwerkraft-Metallversorgung |
GB9813826D0 (en) * | 1998-06-27 | 1998-08-26 | Campbell John | Dispensing apparatus and method |
DE19832192B4 (de) * | 1998-07-17 | 2010-11-04 | Audi Ag | Gussanlage sowie Verfahren zur Zuführung von Metallschmelze zu einer Füllkammer einer Gussanlage |
DE19935357C1 (de) * | 1999-07-29 | 2001-05-10 | Wagner Heinrich Sinto Masch | Gießeinrichtung für eine Gießereiformanlage |
-
2000
- 2000-12-08 DE DE10061026A patent/DE10061026A1/de not_active Withdrawn
-
2001
- 2001-11-06 DE DE50102788T patent/DE50102788D1/de not_active Expired - Lifetime
- 2001-11-06 EP EP01126259A patent/EP1213070B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1213070A3 (de) | 2003-01-29 |
EP1213070A2 (de) | 2002-06-12 |
DE10061026A1 (de) | 2002-06-13 |
DE50102788D1 (de) | 2004-08-12 |
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