EP0793554B1 - Verfahren zum herstellen von gussstücken aus leichtmetall und giessform zur durchführung des verfahrens - Google Patents
Verfahren zum herstellen von gussstücken aus leichtmetall und giessform zur durchführung des verfahrens Download PDFInfo
- Publication number
- EP0793554B1 EP0793554B1 EP96930074A EP96930074A EP0793554B1 EP 0793554 B1 EP0793554 B1 EP 0793554B1 EP 96930074 A EP96930074 A EP 96930074A EP 96930074 A EP96930074 A EP 96930074A EP 0793554 B1 EP0793554 B1 EP 0793554B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- riser
- sand
- casting mould
- mold
- 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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
Definitions
- the invention relates to a method for manufacturing of light metal castings, in particular cylinder heads, Cylinder blocks and / or crankcases for internal combustion engines, with a mold cavity for the casting forming lost form based on sand that Outer mold parts, at least one core and at least one Has feeder to form a pressure mass, the Form is provided with a gate for the molten metal and the metal melt under the influence of gravity in the Mold cavity filled and then with a compressed gas is applied.
- the low pressure casting of light metal melts is also known in permanent molds, with a Pressurizing the melt in the mold with a gas a fine, dense structure can be achieved (DE-A-21 33421, DE-A-28 18 442). Pressurization poses because of the Strength of the mold is not a problem.
- the mold have a very long cooling time is - for high Production speeds - a very large number very expensive molds required. With the frequently occurring changes the castings are then a large number of molds to change; also make new.
- a sand casting process is known in which the molten metal is poured into the sand mold under gravity and then pressurized with a pressurized gas.
- a pressurized gas application is as A molded part made of temperature-resistant material based on aluminum-alumina-silica-iron oxide put on.
- This feeder is made of metal produced, in the sand mold in addition to the molded food part molded pressure chamber enclosed. This pressure chamber is connected to a compressed gas supply.
- the molded molded part must be shaped from the cooled casting and the pressure chamber is first removed from the sand mold, before it is completely disassembled and the sand if necessary can be worked up again.
- the invention has for its object the casting of castings made of light metal under the influence of gravity and in lost forms based on sand regarding the Quality of the casting produced, especially in relation to a particularly dense and fine-grained structure with avoidance of improving microporosity as well as volume the feed material in the form of a pressure mass to reduce.
- Light metal in the sense of the invention includes in particular Aluminum and aluminum alloys.
- the invention achieves the stated object in relation to the Procedure in that a lid core on the mold Sand base is placed, which contains at least one feeder and at least in the areas that can be pressurized with compressed gas is designed gas-impermeable and that immediately after the filling process, the one filled with molten metal Feeder pressurized with the compressed gas becomes.
- the method according to the invention provides that the pressurization of the molten metal in the feeder during the first critical solidification phase of the molten metal is executed, d. H. while the molten metal is still hot is, so that a corresponding influence by the pressure exerted the still flowable melt in the entire molding space is possible.
- This first critical solidification phase goes up to a cooling temperature of the light metal melt of 500 ° C, below this temperature Pressurization only limited effect (claims 5 and 6).
- a (lost) mold is also used the features of the preamble of claim 9 for implementation proposed the method according to the invention, the marked is by at least one containing a feeder Sand-based lid core, on one of which the dining area sealing pressure mask can be placed, and wherein the Cover core gas-impermeable at least in the contact area of the pressure mask is trained.
- the one containing the feeder was made on the basis of sand Cover core by one on its surface at least Core coating applied in the area of the print mask is designed to be gas-impermeable.
- the lid core itself can again composed of several individual cores to form a lid core be, each individual core formed gas-impermeable is, and wherein the individual cores at least in the area the feeder must be tightly connected.
- This Lid core or the lid cores make it possible, according to Filling the mold with metal on the in the lid core attached feeders to exert pressure by means of compressed gas, to be an improved finer and denser in this way Microstructure of the casting produced at the same time lower feeder volume - pressure volume - during the To achieve solidification.
- the lid core through an appropriate choice of the molding material and to design the binder so that it can withstand a pressure withstands up to 1 bar.
- Process are only low pressures below up to 1 bar required to achieve the desired density and fine grain to achieve the structure.
- the print mask that is on the lid core to make one Cavity is provided for pressurization can can also be used in a further development of the invention due to the thermal influence of the molten metal to vacuum the molding sand and the core sand. It is therefore designed so that immediately after solidification of the molten metal and termination of the pressurization the pressure gasses a negative pressure to that of the Print mask covered cavity can be created.
- the print mask is provided with a further connection to be provided, which can be connected to a suction device.
- An advantageous embodiment of the seal of the lid core consists of using a core size as a dispersion Apply diving or spraying.
- the surface treatment with a core size also causes an improved Strength of the lid core.
- Core sizes are fundamental for the equipment of sand cores for the production of Cast iron castings to achieve smoother and non-porous Known surfaces.
- refractory fillers for the equipment of a lid core according to the invention, um Making these gas-impermeable will become core sizes based on a dispersion of refractory fillers in provided an organic solvent. These core sizes can also contain graphite. As refractory fillers come for example silicate refractories, such as zirconium silicate, magnesium and / or aluminum silicate in question. In addition, iron oxide can also be used as refractory filler can be contained in the core size. The core sizes also contain minor ones Amounts up to 1% by weight of a synthetic resin.
- Possible core sizes are the dispersions explained above, however, other material compositions are also can be used which has a gas impermeable surface of the sand cores cause.
- the support shells which preferably consist of one durable material, for example metal, serve to support the pressure from the outside of the mold during of casting and pressurization in the critical first solidification phase of the molten metal in the casting mold.
- the casting mold according to the invention enables a new and economical Process for making castings from Light metals by gravity casting, especially also of such complicated parts as cylinder heads and cylinder blocks of internal combustion engines with high quality castings using sand molds for both the outer shape for the cores as well.
- the molten metal in the feeder is pressurized it, a dense fine structure evenly throughout to produce cast part, so that on the one hand the advantages of the lost forms based on sand can and on the other hand the high quality is achieved like otherwise it can only be achieved with castings in permanent mold casting.
- Fig. 1 is a mold 1 in cross section for a simple rotationally symmetrical casting with a mold cavity 2 shown.
- Form 1 is a lost form with outer mold parts 3.1, 3.2 and a core 4 used and provided with a lid core 5, the feeder 6 for Has formation of the pressure mass.
- the outer mold parts 3.1 and 3.2 are put together in the parting lines 7, likewise
- the core 4 can be composed of several parts to form a core package his. The number and subdivisions of the outer mold parts and the cores 7 or core packages produced according to the shape of the casting to be cast.
- the lid core 5 can also consist of several Core parts are put together and one or have several feeders 6.
- a gas pressure P is exerted.
- This pressure P can be up to to be 1 bar.
- a pressure mask 11 is placed in a sealed manner on the cover core 5.
- the print mask 11 has a connection 12 for the compressed air supply.
- Cover core 5 is usually microporous and therefore air-permeable.
- the lid core 5 In order to exert pressure via the feeder 6 To allow compressed air to the molten metal melt, is the lid core 5 at least on its surface in the coverage area through the pressure mask 11 by means of a Core size coated and thus in the coated area gas impermeable. This seal the surface of the lid core 5 can, for example, by immersing the lid core 5 in a core size.
- the core size for example, based on a refractory dispersion Fillers in an organic solvent, such as Zirconium silicate and carbon, small amounts of synthetic resin and isoropanol, denatured with acetone and some water containing, the surface of the lid core 5 becomes so dense and made stable that the lid core 5 is airtight and that, as shown schematically in Fig. 2, via the print mask withstands the additional pressure P applied.
- an organic solvent such as Zirconium silicate and carbon
- lid core 5 is composed of several parts is, each part is assembled before using a Sealing core sizing externally.
- the core size applied to the lid core must be in front dry and harden using the lid core.
- Applying the pressure P to the cast part by means of the print mask 11 placed on the mold is done in this way long until the solidification process of the light metal melt comes to an end, d. H. to a temperature below 500 ° C is achieved. This time depends on the size of the Workpiece that is manufactured, for example in a Cylinder block with a casting weight of approx. 20 to 22 kg for internal combustion engines approx. 1.5 minutes.
- Fig. 3 is the application of the invention to the manufacture of a crankcase for internal combustion engines in exploded view of the mold parts required for this shown.
- the outer mold is hereby formed by the upper mold block 3.4, the side Moldings 3.5 and the lower mold parts 3.6, which in turn can be composed of individual core parts, depending on the configuration.
- the core block 4.1 also the crankcase core block is again made up of individual core parts composed.
- the upper end of the form is the Lid core 5. All mold parts and the core block 4.1 and the lid core 5 are based on sand as lost Shape.
- the lid core 5 can be a additional part 13, namely a cylinder liner, included, which remains in the cast casting later.
- the lid core 5 contains at least one feeder 6 for the pressure mass and is further on the top with the Print mask 11 can be covered.
- the print mask 11 is sealed placed on the lid core 5 and so over the lid core 5 formed cavity 14 can then by means the compressed air supplied via connection 12 Pressure are applied, so that additionally on the molten metal a pressure on the molten metal in the feeder area can be exercised in the form until it solidifies.
- the lid core 5 can also be on the opposite Side of the crankcase so that the shape is 180 ° is rotated.
- support shells 16 can be provided be that act on the outer mold parts 3.4, 3.5, 3.6. These support shells 16 can be removed before the cast mold after solidification, for example of can be folded away from the pouring station.
- Fig. 4 the lost shape is schematically based of sand, as described in Fig. 3 for a crankcase, in the assembled state schematized in section shown.
- the arrow 17 is the direction in which the Ejector after the support shells have been moved sideways 16 works.
- the cover core 5 is also on here its surface coated with a core size and treated so that it is airtight and sealed the application of a pressure of up to 1 bar by means of the Print mask 11 is enabled.
- FIG. 5 shows a further development of the invention, with a further suction bell 19 on the pressure mask 11 Distance is applied so that this second suction bell also covers the area of the outer mold parts in the upper area, so that all escaping from the form, evolving from the heat of smoke under the Suction bell 19 are sucked off via the connecting piece 20 can.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Forging (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
- Fig. 1
- schematisch die Darstellung einer Gießform,
- Fig. 2
- die Ausrüstung der Gießform gem. Fig. 1 mit einer Druckmaske,
- Fig. 3
- eine schematisierte Explosionsdarstellung einer Gießform in Seitenansicht für ein Kurbelgehäuse,
- Fig. 4
- eine schematisierte Darstellung der Gießform gem. Fig. 3 in zusammengebautem Zustand,
- Fig. 5
- die Darstellung gem. Fig. 1 mit zusätz licher Glocke für die Absaugung.
Claims (15)
- Verfahren zum Herstellen von Gußstücken aus Leichtmetall, insbesondere von Zylinderköpfen, Zylinderblöcken und/oder Kurbelgehäusen für Brennkraftmaschinen, mit einer einen Formhohlraum (2) für das Gußstück bildenden verlorenen Gießform auf der Basis von Sand, die Formaußenteile (3), mindestens einen Kern (7) und mindestens einen Speiser (6) zur Bildung einer Druckmassel aufweist, wobei die Gießform mit einem Einguß (8) für eine Metallschmelze versehen ist und die Metallschmelze unter Wirkung der Schwerkraft in den Formhohlraum (2) eingefüllt und anschließend mit Druck beaufschlagt wird, dadurch gekennzeichnet, daß auf die Gießform ein Deckelkern (5) auf Sandbasis aufgelegt wird, der zumindest einen Speiser (6) enthält, der zumindest in den mit Druckgas beaufschlagbaren Bereichen gasundurchlässig ausgebildet ist und daß unmittelbar nach Beendigung des Füllvorgangs der mit Metallschmelze gefüllte Speiser (6) über das Druckgas mit einem Druck beaufschlagt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß nach Beendigung des Füllvorgangs zur Druckbeaufschlagung des mit Metallschmelze gefüllten Speisers (6) eine Zufuhreinrichtung für das Druckgas an den gasundurchlässig ausgebildeten Teilbereichen dichtens angelegt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der mit Metallschmelze gefüllte Speiser (6) mit einem Druckgas bis zum etwa 1 bar beaufschlagt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Gasundurchlässigkeit des Deckelkerns (5) durch Aufbringen einer Kernschlichte zumindest auf Teilbereiche des Deckelkerns (5) bewirkt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Druckbeaufschlagung der Metallschmelze im Speiser (6) während der ersten kritischen Erstarrungsphase der Metallschmelze ausgeübt wird.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß nach Erreichen einer unterhalb 500°C liegenden Temperatur des in die Gießform gegossenen Metalls die Druckbeaufschlagung der Metallschmelze im Speiser (6) beendet wird.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß zur Druckbeaufschlagung des Speiserbereichs ein oberhalb des Deckelkerns (5) befindlicher und gegenüber diesem abgedichteter Hohlraum (14) mit dem Druckgas beaufschlagt wird.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß nach Beendigung der Druckbeaufschlagung an dem mit Druck beaufschlagbaren Hohlraum (14) ein Unterdruck angelegt wird.
- Gießform zur Herstellung von Gußstücken aus Leichtmetall, insbesondere von Zylinderköpfen, Zylinderblöcken und/oder Kurbelgehäusen für Brennkraftmaschinen, mit Formaußenteilen (3), mindestens einem Kern (4) sowie mindesten einem Speiser (6) zur Bildung einer Druckmassel, der mit einer Einrichtung zur Beaufschlagung mit einem Druckgas verbindbar ist, für die Durchführung des Verfahrens nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß ein wenigstens einen Speiser (6) enthaltender Deckelkern (5) auf Sandbasis vorgesehen ist, auf den eine den Speiserbereich abdichtende Druckmaske (11) aufsetzbar ist, und daß der Deckelkern (5) zumindest im Anlagebereich der Druckmaske (11) gasundurchlässig ausgebildet ist.
- Gießform nach Anspruch 9, dadurch gekennzeichnet, daß der den Speiser (6) enthaltende, auf der Basis von Sand gefertigte Deckelkern (5) durch eine auf seine Oberfläche zumindest im Anlagebereich für die Druckmaske (11) aufgebrachte Kernschlichte gasundurchlässig ausgebildet ist.
- Gießform nach einem der Ansprüche 9 oder 10, dadurch gekennzeichnet, daß der auf der Basis von Sand gefertigte Deckelkern (5) bei einer Druckbeaufschlagung des Speiserbereichs einem Druck von bis zu 1 bar standhält.
- Gießform nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß die Kernschlichte als Dispersion auf den Deckelkern (5) mittels Tauchen oder Sprühen aufgebracht ist.
- Gießform nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß den Formaußenteilen (3) diese zumindest teilweise umfassende, auf die Form zu und weg bewegende Stützschalen (16) zugeordnet sind.
- Gießform nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß die Druckmaske (11) einen Anschluß (18) zum Absaugen von Gasen aufweist.
- Gießform nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß eine über die Druckmaske (11) auf die Gießform, zumindest den Deckelkern (5) übergreifend, abgedichtet aufsetzbare Glocke (19) mit einem Anschluß (20) für eine Unterdruckbeaufschlagung vorgesehen ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19531551 | 1995-08-28 | ||
DE19531551A DE19531551A1 (de) | 1995-08-28 | 1995-08-28 | Verfahren zum Herstellen von Gußstücken aus Leichtmetall und verlorene Form auf Basis von Sand hierfür |
PCT/EP1996/003691 WO1997007914A1 (de) | 1995-08-28 | 1996-08-22 | Verfahren zum herstellen von gussstücken aus leichtmetall und giessform zur durchführung des verfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0793554A1 EP0793554A1 (de) | 1997-09-10 |
EP0793554B1 true EP0793554B1 (de) | 2000-02-23 |
Family
ID=7770545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96930074A Expired - Lifetime EP0793554B1 (de) | 1995-08-28 | 1996-08-22 | Verfahren zum herstellen von gussstücken aus leichtmetall und giessform zur durchführung des verfahrens |
Country Status (7)
Country | Link |
---|---|
US (1) | US5954113A (de) |
EP (1) | EP0793554B1 (de) |
CN (1) | CN1164837A (de) |
AT (1) | ATE189867T1 (de) |
DE (2) | DE19531551A1 (de) |
ES (1) | ES2146016T3 (de) |
WO (1) | WO1997007914A1 (de) |
Families Citing this family (29)
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WO1998041341A1 (en) * | 1997-03-18 | 1998-09-24 | Georg Fischer Disa A/S | Method, pressure-supply member and pressure-supply system for active after-feeding of castings |
DE19803397A1 (de) * | 1998-01-29 | 1999-08-05 | Volkswagen Ag | Gießform zum Herstellen von Gußstücken |
DE19830025B4 (de) * | 1998-07-04 | 2004-06-17 | Audi Ag | Verfahren zum Druckgießen von Leichtmetalllegierungen |
DE10019310C1 (de) * | 2000-04-19 | 2001-10-25 | Vaw Mandl & Berger Gmbh Linz | Gießform, umfassend Außenformteile und darin eingelegte Formstoffkerne |
DE60122420T2 (de) * | 2000-05-10 | 2007-04-19 | Nissin Kogyo Co. Ltd., Ueda | Verfahren und Vorrichtung zum Giessen |
CN1130271C (zh) * | 2000-08-07 | 2003-12-10 | 史保萱 | 挤压冒口补缩的铸造方法 |
ITTO20010287A1 (it) * | 2001-03-27 | 2002-09-27 | Teksid Spa | Apparecchiatura di colata per la produzione di getti metallici mediante tecnologia "lost-foam". |
JP3592252B2 (ja) * | 2001-04-05 | 2004-11-24 | 日信工業株式会社 | 鋳造方法及び鋳造装置 |
US6763876B1 (en) | 2001-04-26 | 2004-07-20 | Brunswick Corporation | Method and apparatus for casting of metal articles using external pressure |
WO2003000447A2 (de) * | 2001-06-23 | 2003-01-03 | Mahle Gmbh | Verfahren zur herstellung einer leichtmetalllaufbuchse mit einer äusseren rauen oberfläche |
FR2841163B1 (fr) * | 2002-06-21 | 2005-01-28 | Montupet Sa | Procede de moulage de pieces de fonderie, notamment de blocs-moteurs, en alliage leger |
US6883580B1 (en) | 2003-01-27 | 2005-04-26 | Brunswick Corporation | Apparatus and improved method for lost foam casting of metal articles using external pressure |
JP4150764B2 (ja) * | 2005-09-15 | 2008-09-17 | 政人 五家 | 鋳造法 |
DE102006030699B4 (de) * | 2006-06-30 | 2014-10-02 | Daimler Ag | Gegossener Stahlkolben für Verbrennungsmotoren |
DE102006053404A1 (de) * | 2006-11-10 | 2008-05-15 | Hydro Aluminium Alucast Gmbh | Gießform zum Gießen eines Gussteils und Verwendung einer solchen Gießform |
CN101254521B (zh) * | 2007-08-31 | 2010-09-29 | 广州驭风旭铝铸件有限公司 | 铸型装置、铸造方法以及铸型涂刷涂料的方法 |
US7814879B2 (en) * | 2008-04-23 | 2010-10-19 | Techtronic Outdoor Products Technology Limited | Monolithic block and valve train for a four-stroke engine |
CN101323015B (zh) * | 2008-08-28 | 2010-06-16 | 南昌航空大学 | 采用复合冲头式加压保温浇冒的金属型旋转浇注工艺 |
KR101108515B1 (ko) * | 2010-02-25 | 2012-01-30 | 주식회사 동서기공 | 압탕부의 용탕 체적 감소형 주형 어셈블리를 이용한 주조방법 |
CN102152672B (zh) * | 2010-11-03 | 2013-01-16 | 湖州电力局 | 半自动送料封印压铸机 |
CN102672443B (zh) * | 2012-04-28 | 2013-08-14 | 苏州雅尔塑业科技有限公司 | 一种型芯的加工工艺 |
CN102941334B (zh) * | 2012-11-27 | 2015-07-01 | 山东圣泉新材料股份有限公司 | 一种铸造加压***及铸造加压方法 |
CN103212672B (zh) * | 2013-03-15 | 2015-07-22 | 马钢(集团)控股有限公司 | 大缸径船用低速柴油机气缸盖的铸造方法 |
EP3012045B1 (de) * | 2013-06-20 | 2017-09-06 | Hitachi Metals, Ltd. | Verfahren zur herstellung eines gussartikels |
CN105592960B (zh) * | 2013-09-30 | 2018-01-19 | 日立金属株式会社 | 铸造装置以及使用该铸造装置的铸件的制造方法 |
CN105364047B (zh) * | 2015-10-22 | 2017-05-24 | 顺德职业技术学院 | 有色金属石膏型快速精密铸造方法 |
CN106077517B (zh) * | 2016-07-27 | 2017-09-26 | 三鑫重工机械有限公司 | 一种高速钢轧辊的铸造方法 |
CN107774914A (zh) * | 2017-12-12 | 2018-03-09 | 重庆乐迪机车车辆配件有限公司 | 一种铸件的发热冒口颈结构 |
CN112846088A (zh) * | 2020-12-31 | 2021-05-28 | 重庆长江造型材料(集团)股份有限公司 | 一种具备多式热工效能的冒口及加工方法 |
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JPH03142056A (ja) * | 1989-10-28 | 1991-06-17 | Asahi Tec Corp | 低圧鋳造方法及び低圧鋳造装置 |
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DE1135619B (de) * | 1958-10-25 | 1962-08-30 | Metallgesellschaft Ag | Verfahren und Vorrichtung zum Herstellen von Gussstuecken in Sandformen unter Verwendung von Druckgas |
DE2133421C3 (de) * | 1971-07-05 | 1973-12-06 | Copal Foundries Ltd., West Bromwich, Staffordshire (Grossbritannien) | Vorrichtung zum Gießen von Aluminium legierungen m vorgewärmte, mehrteilige Kokillen |
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JPS59209456A (ja) * | 1983-05-13 | 1984-11-28 | Hitachi Ltd | 鋼塊の製造法 |
CH668205A5 (en) * | 1986-01-09 | 1988-12-15 | Fischer Ag Georg | Treatment of melt during casting in sand mould - with pulsed pressure ensuring movement of whole melt volume to stop dendritic growth |
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AU6969094A (en) * | 1994-01-03 | 1995-08-01 | Georg Fischer Disa A/S | Method and equipment for feeding shrinkage voids in metal castings |
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1995
- 1995-08-28 DE DE19531551A patent/DE19531551A1/de not_active Withdrawn
-
1996
- 1996-08-22 EP EP96930074A patent/EP0793554B1/de not_active Expired - Lifetime
- 1996-08-22 DE DE59604490T patent/DE59604490D1/de not_active Expired - Fee Related
- 1996-08-22 WO PCT/EP1996/003691 patent/WO1997007914A1/de active IP Right Grant
- 1996-08-22 US US08/817,980 patent/US5954113A/en not_active Expired - Fee Related
- 1996-08-22 AT AT96930074T patent/ATE189867T1/de not_active IP Right Cessation
- 1996-08-22 CN CN96190969A patent/CN1164837A/zh active Pending
- 1996-08-22 ES ES96930074T patent/ES2146016T3/es not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6152978A (ja) * | 1984-08-22 | 1986-03-15 | Daido Steel Co Ltd | 鋳造方法 |
JPH03142056A (ja) * | 1989-10-28 | 1991-06-17 | Asahi Tec Corp | 低圧鋳造方法及び低圧鋳造装置 |
Also Published As
Publication number | Publication date |
---|---|
DE59604490D1 (de) | 2000-03-30 |
US5954113A (en) | 1999-09-21 |
EP0793554A1 (de) | 1997-09-10 |
WO1997007914A1 (de) | 1997-03-06 |
ES2146016T3 (es) | 2000-07-16 |
ATE189867T1 (de) | 2000-03-15 |
CN1164837A (zh) | 1997-11-12 |
DE19531551A1 (de) | 1997-03-06 |
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