EP0956916A1 - Verfahren zum steigenden Niederdruck-Giessen von Metall, insbesondere Leichtmetall - Google Patents
Verfahren zum steigenden Niederdruck-Giessen von Metall, insbesondere Leichtmetall Download PDFInfo
- Publication number
- EP0956916A1 EP0956916A1 EP99108387A EP99108387A EP0956916A1 EP 0956916 A1 EP0956916 A1 EP 0956916A1 EP 99108387 A EP99108387 A EP 99108387A EP 99108387 A EP99108387 A EP 99108387A EP 0956916 A1 EP0956916 A1 EP 0956916A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- melt
- mold
- volume
- speed
- 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
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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
- B22D18/04—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
- B22D33/00—Equipment for handling moulds
- B22D33/005—Transporting flaskless moulds
Definitions
- the invention relates to a method for increasing Low pressure casting of metal, especially light metal, by a mold provided with at least one feeder with her sprue on a riser pipe to one Melting container connected and the contained therein Melt under pressure through the riser pipe into the mold is ousted.
- closure In low-pressure casting plants it is known (WO 95/20449) in the area of the transition from the riser to the shape Provide closure. This has primarily that Task, swirls in the melting vessel, especially in the gas cushion above the melting level to avoid.
- the closure consists of one at the transition between the riser and the cast-in melting plate with a lower melting point than the aluminum melt. This closure plate is when the Melt liquefied. These liquid foreign components are introduced into the form and lead to the highest unwanted inclusions in the cast.
- the closure has to each cast can be replaced so that the performance is correspondingly low.
- the container has a bottom side Slider lock on after filling the mold closes.
- the mold is made together with the Make-up unit uncoupled from the riser pipe and the pouring shrinkage by feeding the melt from the replenisher in the shape balanced.
- the dynamic surge at the end of the pour depends on the given Part geometry primarily from the venting behavior the shape (gas permeability in sand molds, ventilation holes etc.), but in any case on the casting speed at the end of the casting shortly before the complete Filling the form.
- Burr formation means elaborate cleaning work, which, depending on the type of part, accounts for over 30% of the production costs of the Can make cast part. Burr free or low burr Casting is therefore of great economic importance.
- a third type of error is blistering due to Air and gas inclusions that occur during casting, predominantly, however, arise in the phase shortly before the end of casting.
- the casting gases are preventive via exhaust air ducts, by blowing a whistle, by using open feeders or use of molded materials with high gas permeability dissipated.
- Errors of the aforementioned kind already occur today's low casting rates of 1 to 2 kg / sec for aluminum alloys. Will the casting performance it is expected that the Gas bubble formation increases significantly. For the so far pouring various methods are known. So z. B. the use of a gas pressure cushion in Melting container or furnace, which the melt over the filled riser pipe.
- the invention is based, with increasing the task Casting light metal has a higher casting speed and thus higher cycle times with high casting quality to reach.
- This object is achieved in that the vast majority of that for filling the mold necessary melting volume with maximum casting speed displaced into the mold, then the melt column repelled in the riser and one between the shear point and the remaining volume with a negative velocity gradients in the mold is ousted.
- the filling process divided into two sections the first section follows the usual process of increasing pouring, by the given free cross-section of the riser the melt column solely by driving on Melt container or furnace up to the maximum casting speed accelerated and this until shortly before the end of casting is maintained. Then the melt column sheared near the gate so that the maximum Maintain pouring speed for a short time until the melt column is completely sheared off is. The one remaining between the shear point and the gate The remaining volume will then decrease continuously Speed displaced into the mold, so that the Melt front rises and slows within the mold on the one hand, the remaining air in the mold is checked can escape, on the other hand a dynamic Avoid filling impact on the upper mold surfaces becomes. This also prevents that in Melt volume in the mold is too high a hydrostatic Pressure builds up.
- the residual volume is discontinuous Displaced speed gradients into the mold, for example initially with the maximum casting speed, then with a flat and then steep negative velocity gradient.
- the method according to the invention gives in particular the Possibility of depending on the size of the remaining volume on the volume and / or the geometry of the casting choose.
- the speed gradient and / or its temporal course depending on the volume and / or the geometry of the casting can be selected.
- an intricate geometry especially in upper area of the shape, faster degradation of the speed gradient considered than for large-volume and little intricate shapes.
- the remaining volume should be about 10% of the volume of the casting make up, preferably it is 3 - 7 vol% of the casting.
- the invention is based on the implementation of the method from a device with a transport track to cyclical Movement of the molds with at least one feeder and a gate, a pouring station on the conveyor, on which the molds can be positioned one after the other are a melt container that can be positioned at the casting station, especially melt furnace, one in the melt immersing riser pipe to which the Casting mold can be connected with its sprue, and one Pressure generator for displacing the melt from the melt container over the riser pipe and the pouring into the Mold.
- Such a device is distinguished according to the invention characterized in that at the transition between the riser and Infeed into a tubular section forming the residual volume is arranged in which a controlled displacer between a the mouth of the riser in this section releasing pouring position over a die Intermediate position closing the mouth in a Sealing position is movable.
- the melt column displaced in the riser pipe reaches with the maximum casting speed over the tubular Section and pouring into the mold.
- the displacer is controlled and reduced the free cross section of the mouth in a given Time at the end of which the melt column is completely sheared off is so that the furnace side acting on them Driving forces no longer on that in the tubular section included residual volumes can act.
- This residual volume is then removed using the displacer the given negative speed gradient in the shape displaces until the displacer reaches its end position reached in which he closes the gate.
- the tubular section is preferably aligned with the Sprue so that the residual volume translationally without any deflection and thus squeezed into the form in a way that is easy to control becomes. This can be done with vertical pouring at the bottom of the mold done just as favorably as with a horizontal one side gate.
- the speed of the displacer is preferably in Dependence on the geometry and / or the volume of the Cast part controllable, possibly also by means of a Program can be specified.
- At least the tubular section can counter a section interchangeable with another volume or be extendable by another section to the remaining volume to the geometry or the volume of the Optimally adapt the casting.
- tubular section and the displacer from a cylinder-piston unit formed and the riser pipe opens laterally into the cylinder close to the end position of the piston in the Cylinder.
- the casting plant designed according to the invention is both suitable for sand mold casting as well as permanent mold casting.
- the embodiments shown in the drawings concern only casting in sand molds (with or without molded box).
- the shaped bales 1 are in the direction of Arrow 3 promoted to a casting station at the Melting vessel 4, optionally in the form of an oven, lifting and is arranged lowerable and movable.
- the light metal melt 5 is located in the melt vessel 4, a gas cushion 6 stands over the melt surface thereof, which is acted upon by a controllable pressure generator.
- a total of 7 is dipped into the melting vessel 4
- the form bales 1 are clocked by means of the conveyor 2, that a bale of mold in the pouring position at every cycle is coming. Then the device with the short vertical section 9 of the riser is adjusted so that the latter in alignment with the sprue 11 of the bale reached.
- a displacer arranged in the form of a piston 12 by means of a pressure medium cylinder 13 is actuated.
- FIGS. 3 and 4 differs 1 essentially only in that Box molds 17 are poured.
- the riser cross section then decreases by increasing overrun the mouth 18 through the piston 12 quickly like this curve section 31 shows until finally the piston 12 completely melted the melt column at the mouth 18 has, as indicated in the diagram at 32.
- the casting speed remains on the curve section 24 initially still at the maximum value and falls then with a negative speed gradient, and initially over a short period with a flat Decrease in curve section 25 to then in Curve section 26 to drop steeply and finally turn out flat in the curve section 27 until at 28 the gate 11 is closed by the piston 12.
- the course of the casting speed in the curve sections 24, 25, 26 and 27 is only shown as an example and otherwise dependent on the casting geometry these customizable.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
Description
- Fig. 1
- eine schematische Ansicht einer Niederdruck-Gießanlage für den kastenlosen Sandguß in einer ersten Betriebsstellung;
- Fig. 2
- die Gießanlage gemäß Fig. 1 in einer weiteren Betriebsstellung;
- Fig. 3
- eine schematische Ansicht einer Niederdruck-Gießanlage für den Kastenguß in einer ersten Betriebsstellung;
- Fig. 4
- die Gießanlage gemäß Fig. 3 in einer weiteren Betriebsstellung und
- Fig. 5
- ein Zeitdiagramm zum Anlauf des Gießvorgangs.
Claims (14)
- Verfahren zum steigenden Niederdruck-Gießen von Metall, insbesondere Leichtmetall, indem eine mit wenigstens einem Speiser versehene Gießform mit ihrem Einguß über ein Steigrohr an einen Schmelzebehälter angeschlossen und die darin enthaltene Schmelze unter Druck durch das Steigrohr in die Gießform verdrängt wird, dadurch gekennzeichnet, daß der überwiegende Teil des für das Füllen der Gießform notwendigen Schmelzevolumens mit maximaler Gießgeschwindigkeit in die Gießform verdrängt, dann die Schmelzesäule im Steigrohr abgeschert und ein zwischen der Abscherstelle und dem Einguß verbleibendes Restvolumen mit einem negativen Geschwindigkeitsgradienten in die Gießform verdrängt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Restvolumen mit einem unstetigen Geschwindigkeitsgradienten in die Gießform verdrängt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Restvolumen zunächst mit der maximalen Geschwindigkeit, anschließend mit einem flach und daraufhin steil negativen Geschwindigkeitsgradienten in die Gießform verdrängt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Größe des Restvolumens in Abhängigkeit von dem Volumen und/oder der Geometrie des Gußteils gewählt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Geschwindigkeitsgradient und/oder dessen zeitlicher Verlauf in Abhängigkeit von dem Volumen und/oder der Geometrie des Gußteils gewählt wird.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß bis etwa 10 % des Volumens des Gußteils das Restvolumen bilden.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß 3 bis 7 Vol % des Gußteils das Restvolumen bilden.
- Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einer Transportbahn zur taktweisen Bewegung von Gießformen mit wenigstens einem Speiser und einem Einguß, einer Gießstation an der Transportbahn, an der die Gießformen nacheinander positionierbar sind, einem an der Gießstation positionierbaren Schmelzebehälter, insbesondere Schmelzeofen, einem in die Schmelze eintauchenden Steigrohr, an das an der Gießstation die Gießform mit ihrem Einguß anschließbar ist, und einem Druckerzeuger zum Verdrängen der Schmelze aus dem Schmelzebehälter über das Steigrohr und den Einguß in die Gießform, dadurch gekennzeichnet, daß am Übergang zwischen Steigrohr (7, 8) und Einguß (11) ein das Restvolumen bildender, rohrförmiger Abschnitt (9) angeordnet ist, in welchem ein gesteuerter Verdränger (12) zwischen einer die Mündung (18) des Steigrohrs (7, 8) in diesen Abschnitt (9) freigebenden Gießposition über eine die Mündung verschließende Zwischenposition in eine den Einguß (11) verschließende Endlage bewegbar ist.
- Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der rohrförmige Abschnitt (9) mit dem Einguß (11) fluchtet.
- Vorrichtung nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß die Geschwindigkeit des Verdrängers (12) steuerbar ist.
- Vorrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß die Geschwindigkeit des Verdrängers (12) in Abhängigkeit von der Geometrie und/oder dem Volumen des Gußteils steuerbar ist.
- Vorrichtung nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß zumindest der rohrförmige Abschnitt (9) gegen einen Abschnitt mit anderem Volumen austauschbar ist.
- Vorrichtung nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß der rohrförmige Abschnitt (9) durch einen weiteren rohrförmigen Abschnitt verlängerbar ist.
- Vorrichtung nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, daß der rohrförmige Abschnitt (9) und der Verdränger (12) von einer Zylinder-Kolbeneinheit gebildet sind und das Steigrohr (7, 8) seitlich in den Zylinder (9) nahe der dem Einguß fernen Endlage des Kolbens (12) in den Zylinder (9) einmündet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19821419 | 1998-05-13 | ||
DE19821419A DE19821419A1 (de) | 1998-05-13 | 1998-05-13 | Verfahren zum steigenden Niederdruck-Gießen von Metall, insbesondere Leichtmetall |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0956916A1 true EP0956916A1 (de) | 1999-11-17 |
EP0956916B1 EP0956916B1 (de) | 2004-09-15 |
Family
ID=7867629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99108387A Expired - Lifetime EP0956916B1 (de) | 1998-05-13 | 1999-04-29 | Verfahren zum steigenden Niederdruck-Giessen von Metall, insbesondere Leichtmetall |
Country Status (5)
Country | Link |
---|---|
US (1) | US6321825B1 (de) |
EP (1) | EP0956916B1 (de) |
JP (1) | JPH11347707A (de) |
AT (1) | ATE276062T1 (de) |
DE (2) | DE19821419A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002102531A1 (en) * | 2001-05-31 | 2002-12-27 | Disa Industries A/S | Filling-tube construction for providing a connection between a mould to be filled with molten metal and a mould-filling furnace |
WO2003002285A2 (en) * | 2001-05-08 | 2003-01-09 | Fowler White Boggs Banker P A | Continuous, pressurized mold filling process and casting machine for making automative and aerospace components |
CN104493136A (zh) * | 2014-11-25 | 2015-04-08 | 柳州金特机械有限公司 | 一种铸造炉 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19905874C2 (de) * | 1999-02-12 | 2003-07-24 | Vaw Alucast Gmbh | Vorrichtung zum Befüllen von Gießformen |
DE10033625A1 (de) * | 2000-07-11 | 2002-01-31 | Vaw Ver Aluminium Werke Ag | Verfahren und Vorrichtung zum steigenden Gießen mit einer Kokille / einem Kernpaket mit offener Eingußöffnung |
DE10033902C1 (de) * | 2000-07-12 | 2001-11-22 | Vaw Ver Aluminium Werke Ag | Verfahren und Vorrichtung zum steigenden Giessen mit einem auf den Giesstisch aufgesetzten Schieberverschluss |
DE10033903C1 (de) * | 2000-07-12 | 2001-11-29 | Vaw Ver Aluminium Werke Ag | Verfahren und Vorrichtung zum steigenden Giessen mit einer Giessform mit untenliegender Eingussöffnung mit einem Schieberverschluss |
DE10045594B4 (de) * | 2000-09-15 | 2006-01-19 | Hansgrohe Ag | Verfahren und Vorrichtung zum Gießen von Hohlkörpern |
DE102004016574A1 (de) * | 2004-03-31 | 2005-10-27 | Georg Fischer Kokillenguss GmbH | Kokillengiessanlage |
DE102004016575A1 (de) * | 2004-03-31 | 2005-10-27 | Georg Fischer Kokillenguss GmbH | Kokillengiessanlage |
DE102015208964A1 (de) | 2015-05-15 | 2016-11-17 | Harald Justus Weis | Verfahren zum Gießen von Metall, Adaptereinheit und Vorrichtung zum Gießen von Metall umfassend eine derartige Adaptereinheit |
CN107520426B (zh) * | 2017-07-03 | 2019-09-10 | 北京航星机器制造有限公司 | 一种大型铸件低压铸造承载转换装置及其制造方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58125358A (ja) * | 1982-01-20 | 1983-07-26 | Hitachi Ltd | 溶湯鍛造装置 |
JPH03254353A (ja) * | 1990-03-02 | 1991-11-13 | Toyo Mach & Metal Co Ltd | 低圧鋳造方法及びその装置 |
WO1993011892A2 (en) * | 1991-12-07 | 1993-06-24 | Baxi Partnership Limited | Casting of light metal alloys |
WO1995032826A1 (en) * | 1994-05-27 | 1995-12-07 | Georg Fischer Disa A/S | Methods of closing the inlet in a mould after non-gravity casting with a non-ferrous alloy of green-sand moulds in a mould-string plant |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
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DE1150182B (de) * | 1957-12-11 | 1963-06-12 | Karl Goehring Dipl Ing | Kontaktgesteuerte Fuellvorrichtung fuer Warmkammerdruckgiessmaschinen |
JPS5510381A (en) * | 1978-07-11 | 1980-01-24 | Kobe Steel Ltd | Forging apparatus for molten metal |
BG34491A1 (en) * | 1982-07-14 | 1983-10-15 | Nikolov | Method for casting under pressure |
DE3344537C1 (de) * | 1983-12-09 | 1985-06-05 | Daimler-Benz Ag, 7000 Stuttgart | Verfahren zum taktweisen Dosieren einer flüssigen Metallmenge beim Druckgießen |
JPS6156763A (ja) * | 1984-08-24 | 1986-03-22 | Sintokogio Ltd | 低圧鋳造用金型装置 |
JPH02155557A (ja) * | 1988-12-08 | 1990-06-14 | Toyota Motor Corp | 加圧鋳造装置 |
JP2700032B2 (ja) * | 1989-01-20 | 1998-01-19 | 株式会社アーレスティ | 金型鋳造法 |
DE3924775C1 (de) * | 1989-07-26 | 1990-03-29 | Alcan Deutschland Gmbh, 3400 Goettingen, De | |
DE4332760A1 (de) * | 1993-09-25 | 1995-03-30 | Klaus Doehrer | Verfahren zum Betreiben einer Niederdruckmetallgießvorrichtung und Niederdruckmetallgießvorrichtung dafür |
EP0804307A1 (de) * | 1994-01-31 | 1997-11-05 | Honsel Fonderie Messier SA | Verfahren und vorrichtung zum giessen eines metalls in eine form |
DE19613668C1 (de) * | 1996-04-04 | 1997-05-28 | Gustav Ohnsmann | Gießanlage und Verfahren zur Herstellung von Gußstücken |
DE29708575U1 (de) * | 1997-05-14 | 1997-07-31 | Heinrich Wagner Sinto Maschinenfabrik Gmbh, 57334 Bad Laasphe | Vorrichtung zum steigenden Gießen in Gießformen |
DE19807623A1 (de) * | 1998-02-21 | 1999-08-26 | Georg Fischer Disa Ag | Niederdruck-Gießverfahren für Leichtmetalle, insbesondere Aluminium |
-
1998
- 1998-05-13 DE DE19821419A patent/DE19821419A1/de not_active Withdrawn
-
1999
- 1999-04-29 AT AT99108387T patent/ATE276062T1/de not_active IP Right Cessation
- 1999-04-29 US US09/301,604 patent/US6321825B1/en not_active Expired - Lifetime
- 1999-04-29 EP EP99108387A patent/EP0956916B1/de not_active Expired - Lifetime
- 1999-04-29 DE DE59910485T patent/DE59910485D1/de not_active Expired - Lifetime
- 1999-05-12 JP JP11131552A patent/JPH11347707A/ja not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58125358A (ja) * | 1982-01-20 | 1983-07-26 | Hitachi Ltd | 溶湯鍛造装置 |
JPH03254353A (ja) * | 1990-03-02 | 1991-11-13 | Toyo Mach & Metal Co Ltd | 低圧鋳造方法及びその装置 |
WO1993011892A2 (en) * | 1991-12-07 | 1993-06-24 | Baxi Partnership Limited | Casting of light metal alloys |
WO1995032826A1 (en) * | 1994-05-27 | 1995-12-07 | Georg Fischer Disa A/S | Methods of closing the inlet in a mould after non-gravity casting with a non-ferrous alloy of green-sand moulds in a mould-string plant |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 237 (M - 250) 21 October 1983 (1983-10-21) * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 057 (M - 1210) 13 February 1992 (1992-02-13) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003002285A2 (en) * | 2001-05-08 | 2003-01-09 | Fowler White Boggs Banker P A | Continuous, pressurized mold filling process and casting machine for making automative and aerospace components |
WO2003002285A3 (en) * | 2001-05-08 | 2004-11-11 | David J Herron | Continuous, pressurized mold filling process and casting machine for making automative and aerospace components |
WO2002102531A1 (en) * | 2001-05-31 | 2002-12-27 | Disa Industries A/S | Filling-tube construction for providing a connection between a mould to be filled with molten metal and a mould-filling furnace |
CN104493136A (zh) * | 2014-11-25 | 2015-04-08 | 柳州金特机械有限公司 | 一种铸造炉 |
Also Published As
Publication number | Publication date |
---|---|
DE59910485D1 (de) | 2004-10-21 |
JPH11347707A (ja) | 1999-12-21 |
EP0956916B1 (de) | 2004-09-15 |
ATE276062T1 (de) | 2004-10-15 |
DE19821419A1 (de) | 1999-11-18 |
US6321825B1 (en) | 2001-11-27 |
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