EP0933153B1 - Giessform zum Herstellen von Gussstücken - Google Patents
Giessform zum Herstellen von Gussstücken Download PDFInfo
- Publication number
- EP0933153B1 EP0933153B1 EP98120099A EP98120099A EP0933153B1 EP 0933153 B1 EP0933153 B1 EP 0933153B1 EP 98120099 A EP98120099 A EP 98120099A EP 98120099 A EP98120099 A EP 98120099A EP 0933153 B1 EP0933153 B1 EP 0933153B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- casting mould
- gas
- mould according
- mask
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
-
- 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
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
Definitions
- the invention relates to a mold for producing castings from a cast metal, in particular Cylinder heads, cylinder blocks, gearbox and / or crankcase for Internal combustion engines, with outer mold parts, at least one core with at least one Feeder for forming a pressure mass, with a core sealing the feed area on the core Print mask can be put on and also the core at least in the area of the Pressure mask is designed gas-impermeable, according to the preamble of claim 1.
- a generic casting mold is known from WO 97/07914.
- the Casting mold a mold cavity for the core and outer mold parts forming the casting for example based on sand.
- a feeder is for forming one Pressure mass provided, the casting mold with a sprue for a molten metal is provided and the molten metal under the action of gravity in the mold cavity is fillable.
- On the casting mold is a lid core that is gas-impermeable at least in some areas hung up, which contains at least one feeder. Sitting on the edge of the lid core a pressure mask, which forms a pressurizable space above the feeder.
- the one filled with molten metal is filled Pressurizer pressurized with a pressure, which builds up in the pressure mask is. This results in a dense metal structure and a reduced ingot volume and avoid formation of voids in the metal alloy.
- the usually used cores of the mold cavity consist of a binding material chemically bound sand and possibly a size. During the casting process this binding material burns and gases and resins escape. The disadvantage here is that these gases and resins collect within the pressure hood and precipitate on it.
- the present invention is therefore based on the object of an improved casting mold of the type mentioned above, whereby the disadvantages mentioned above are overcome should be.
- At least one additional gas inlet channel and at least one gas outlet channel is formed between the lid core and the pressure mask is and below the gas inlet channel and the gas outlet channel in an interior the hood is provided with a hood, which covers the lid core divides an interior of the print mask into an upper and a lower area, which in gas-conducting connection.
- the print mask For establishing a gas-conducting connection between the upper and the lower area the print mask forms the edge of the hood to the side walls of the print mask a gas-conducting gap.
- An additional improved heat shield between that in the upper area of the Blown compressed air and the pressure mass is achieved in that the Hood has a shielding plate on the pressure mask side, which has a predetermined gap between hood and shield plate.
- the hood is expediently made of aluminum or another heat-insulating material Made of material.
- gas inlet channels and Gas outlet channels of the pressure mask are designed as perforated or slotted tubes.
- the cast metal is a light metal, in particular aluminum, or a metal alloy, especially an aluminum alloy.
- the seal between the core and the pressure mask is expediently designed in such a way that that a pressure build-up of approximately up to 0.1 bar is guaranteed.
- hood also has a heat source, for example a Heating wire.
- a preferred further development of the invention is for drawing in all the casting gases that are formed a suction hood with suction opening encapsulating the entire mold with a pressure mask intended. In this way, any environmentally harmful casting gases removed in a controlled manner so that a reduced environmental impact is achieved.
- the suction opening is advantageously equipped with a first butterfly valve, which the Suction opening either opens or closes.
- the print mask For additional suction of casting gases generated within the pressure mask is in the print mask is provided with an opening adjacent to the suction opening, which opening is preferred can be opened or closed by means of a second butterfly valve.
- the casting mold 10 shown in Fig. 1 comprises a molded part 12 with not shown Mold outer parts and cores.
- a lid core 14 forms a seal and a support for a pressure mask 16, with a circumferential sealing cord 18 at the points of contact between Cover core 14 and pressure mask 16 brings about a gas-tight seal.
- an adhesive 20 is provided in the lid core 14.
- a gas pressure line leads into an interior of the pressure mask 16 inside and serves to build up a pressure in this interior, which on a casting compound or a pressure mass acts in a feeder, not shown, and thereby solid metal structure and a void-free hardening of the casting material.
- the Pressure build-up within the pressure mask 16 takes place after the casting mold 10 has been filled Casting material and preferably with a time delay of, for example, 30 seconds, since it can be achieved a smooth outer surface of the cast part is initially formed should, i.e. a solidification of the casting material at the interfaces to the outer mold parts and Cores.
- a hood 22 is arranged in the interior of the pressure mask 16, which divides the interior into an upper area 24 and a lower area 26. These two Areas 24, 26 are through a gap 28 between the hood 22 and a side wall the pressure mask 16 gas-connected.
- the hood 22 is located in this way above the lid core 14 that the hood 22 within the pressure mask 16th covered.
- a shielding plate 30 is also arranged on the hood 22, between the hood 22 and the shielding plate 30, a gap 32 is formed.
- gas inlet channel 34 and a Gas outlet channel 36 which are formed as perforated tubes and which parts of the Print mask 16 can be.
- Gas for example air
- the gas is expediently introduced via the gas inlet channel 34 and the gas outlet via the gas outlet channel 36 such that from the outside on Gas inlet and outlet channels 34 and 36 each have at least the gas pressure which is present should prevail within the print mask 16.
- the line path of the gas outlet channel 36 there is preferably at least one not shown Filters arranged, which pollutant-like loads of the interior 24, 26 of the pressure mask 16 filters out flowing gas, so that it is not harmful to the environment Way into the environment and, if necessary, a recycling process instead can be supplied. This prevents outgassing from accumulating Fabrics in the interior 24, 26 of the print mask 16 and a knockdown of these substances the print mask 16 itself, resulting in short cleaning intervals or short downtimes lead the arrangement and would mean an increased cost.
- the inflow and outflow of gas through the gas inlet and outlet channels 34 and 36 is for one associated with turbulence in the atmosphere in the interior 24, 26 of the pressure mask 16 and at the same time this gas stream cools all parts with which it comes into contact.
- the covering hood is to prevent cooling, especially of the pressure mass 22 provided, which is a direct thermal contact of the parts in the lower area 26 prevented with the gas flow in the upper region 24. Also an indirect thermal Contact by heat radiation is through the additional shielding plate 30 and the gap 32 prevented.
- the print mask 16 ensures that in the entire interior 24, 26 of the print mask the same predetermined pressure prevails and additionally from the molded part 12 or from the Gaseous substances flowing out of the casting compound from the lower region 26 into the upper region Area 24 rise and can be discharged through the gas outlet channel 36.
- the hood 22 is arranged in the pressure mask 16 such that it has no parts in the lower Area 26, such as the casting compound or the melt or the lid core, touched.
- the hood 22 is in the interior, for example by means of a pin or a sleeve 42 24, 26 of the pressure mask 16, the pin or the sleeve 42 being attached to one Roof part or upper part of the pressure mask 16 is attached.
- FIG. 2 shows a preferred development of the casting mold according to the invention from FIG. 1, the same parts are provided with the same reference numbers. For a more detailed description these parts are therefore referred to the analog valid version of FIG. 1.
- the entire arrangement is an encapsulating suction hood 44 with a suction opening 46 arranged. 2, the suction hood 44 is not complete for the sake of illustration shown, but this is intended to cover the entire mold including the pressure hood 16 enclose or encapsulate.
- Flow within the exhaust hood 44 in the direction of arrow 54 Air and any escaping casting gases which can escape through the suction opening 46. This flow is, for example, by means of a pump behind the suction opening 46 or generated by different temperature levels by means of convection.
- a control of the Suction takes place, for example, through a butterfly valve provided in the suction opening 46 48. If this is open, a suctioning fluid flow takes place, as with the Arrows 54 indicated. If the butterfly valve 48 is closed, no gases are emitted derived from a space 56 between the suction hood 44 and the mold.
- This arrangement is also for the assisted discharge of casting gases from the areas 24 and 26 above and below the hood 22 suitable.
- a pressurization of that Tube 38 takes place here only for a limited time. Without inflow via the pipe 38, however, is absent a pressure that would cause pouring gas to flow out through tube 40.
- the flow in the suction hood 44 can according to the Arrows 54 in the manner of an injector action also for extracting gases from the pressure mask 16 can be used.
- the pressure mask 16 is adjacent to the suction opening 46 an opening 50 is provided which is provided by a second butterfly valve 52 can either be opened or closed. With the second butterfly valve 52 open tear the flow according to the arrows 54 in the space 56 through the opening 50 emerging gases with and leads them in a controlled manner via the suction opening 46.
- a pressure p within the pressure mask 16 is expediently greater than a pressure p 1 between the suction hood 44 and the casting mold, ie as the pressure p 1 in the volume 56 encapsulated by the suction hood.
- the first shut-off flap 46 and / or the second shut-off flap is also preferred 52 controlled by the casting process.
- a time control may be mentioned as an example of such a control.
- an event of the casting process such as the placement of a pan or the filling of a mold of the casting mold, forms a zero point in time from which the first butterfly valve 46 and / or the second butterfly valve 52 is opened or opened in a predetermined manner or according to a predetermined schedule is closed.
- the design of the tubes 38 and 40 is corresponding to adapt to the changed flow conditions, for example by opening or enlarge or reduce the corresponding passage cross sections of the tubes 38 and 40. This can also preferably be done variably during the casting process. Furthermore are adjust the pressures and media masses accordingly.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
- Fig. 1
- eine vorteilhafte Ausführungsform einer erfindungsgemäßen Gießform in Schnittansicht und
- Fig. 2
- eine bevorzugte Weiterbildung der erfindungsgemäßen Gießform von Fig. 1 in Schnittansicht.
Claims (14)
- Gießform zum Herstellen von Gußstücken aus einem Gußmetall, insbesondere Zylinderköpfe, Zylinderblöcke, Getriebegehäuse und/oder Kurbelgehäuse für Brennkraftmaschinen, mit Formaußenteilen, mindestens einem Kern (14) mit mindestens einem Speiser zum Bilden einer Druckmassel, wobei auf den Kem (14) eine den Speiserbereich abdichtende Druckmaske (16) aufsetzbar ist und ferner der Kem (14) zumindest im Anlagebereich der Druckmaske (16) gasundurchlässig ausgebildet ist, dadurch gekennzeichnet, daß zwischen dem Kem (14) und der Druckmaske (16) wenigstens ein zusätzlicher Gaseinlaßkanal (34) und wenigstens ein Gasauslaßkanal (36) ausgebildet ist und unterhalb des Gaseinlaßkanals (34) und des Gasauslaßkanals (36) in einem Innenraum (24,26) der Druckmaske (16) eine Haube (22) vorgesehen ist, welche den Deckelkern (14) überdeckend einen Innenraum der Druckmaske (16) in einen oberen und einen unteren Bereich (24,26) teilt, welche in gasleitender Verbindung miteinander stehen.
- Gießform nach Anspruch 1,
dadurch gekennzeichnet, daß
die Haube (22) randseitig zu Seitenwandungen der Druckmaske (16) einen gasleitenden Spalt (28) ausbildet. - Gießform nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß
die Haube (22) druckmaskenseitig ein Abschirmblech (30) aufweist, welches einen vorbestimmten Spalt (32) zwischen Haube (22) und Abschirmblech (30) ausbildet. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Haube (22) aus Aluminium oder einem anderen wärmelisolierenden Material gefertigt ist. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Gaseinlaßkanäle (34) und Gasauslaßkanäle (36) der Druckmaske (16) als perforierte oder geschlitzte Rohre ausgebildet sind. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
im Leitungsweg des Gasauslaßkanals (36) wenigsten ein Filter vorgesehen ist, welcher umweltschädliche Bestandteile des aus dem Inneren der Druckmaske (16) geförderten Gasgemisches abfiltert. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß Gaseiniaßkanal (34) und Gasauslaßkanal (36) als Teil der Druckmaske (16) ausgebildet sind. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
das Gußmetall ein Leichtmetall, insbesondere Aluminium, oder eine Metallegierung, insbesondere eine Aluminiumlegierung, ist. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Abdichtung zwischen Kern (14) und Druckmaske (16) derart ausgebildet ist, daß ein Druckaufbau von etwa bis zu 0,1 bar gewährleistet ist. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Haube (22) zusätzlich eine Wärmequelle, beispielsweise einen Heizdraht, aufweist. - Gießform nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
eine die gesamte Gießform mit Druckmaske (16) einkapselnde Absaughaube (44) mit Absaugöffnung (46) vorgesehen ist. - Gießform nach Anspruch 11,
dadurch gekennzeichnet, daß
die Absaugöffnung (46) mit einer ersten Absperrklappe (48) ausgestattet ist, welche die Absaugöffnung (46) wahlweise öffnet oder verschließt. - Gießform nach Anspruch 11 oder 12,
dadurch gekennzeichnet, daß
in der Druckmaske (16) benachbart zur Absaugöffnung (46) ein Öffnung (50) vorgesehen ist. - Gießform nach Anspruch 13,
dadurch gekennzeichnet, daß
die Öffnung (50) der Druckmaske (16) mit einer zweiten Absperrklappe (52) ausgestattet ist, welche die Öffnung (50) der Druckmaske (16) wahlweise öffnet oder verschließt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803397A DE19803397A1 (de) | 1998-01-29 | 1998-01-29 | Gießform zum Herstellen von Gußstücken |
DE19803397 | 1998-01-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0933153A1 EP0933153A1 (de) | 1999-08-04 |
EP0933153B1 true EP0933153B1 (de) | 2003-01-22 |
Family
ID=7856005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98120099A Expired - Lifetime EP0933153B1 (de) | 1998-01-29 | 1998-10-24 | Giessform zum Herstellen von Gussstücken |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0933153B1 (de) |
AT (1) | ATE231426T1 (de) |
DE (2) | DE19803397A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020104639A1 (en) * | 2001-01-09 | 2002-08-08 | Kroes Calvin L. | Investment casting with improved melt feeding |
CN103081418B (zh) | 2010-09-09 | 2015-07-08 | 日本电气株式会社 | 计算机系统和计算机系统中的通信方法 |
DE102013214534B4 (de) * | 2013-07-25 | 2021-07-01 | Bayerische Motoren Werke Aktiengesellschaft | Gießvorrichtung und Gießverfahren |
CN114192756B (zh) * | 2021-12-15 | 2023-07-25 | 湖南江滨机器(集团)有限责任公司 | 活塞浇铸模具冷却系统及活塞浇铸设备 |
CN115673297B (zh) * | 2022-12-29 | 2023-04-14 | 泊头市青峰机械有限公司 | 一种铸件制备用加压凝固装置及方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE249598C (de) * | 1911-03-25 | |||
FR1119044A (fr) * | 1955-02-11 | 1956-06-14 | Procédé et dispositif de coulée de toutes sortes de pièces en métaux ferreux ou non ferreux | |
BE551371A (de) * | 1956-05-30 | |||
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 |
FR2228562B1 (de) * | 1973-05-09 | 1977-04-29 | Pechiney Aluminium | |
JPS59209456A (ja) * | 1983-05-13 | 1984-11-28 | Hitachi Ltd | 鋼塊の製造法 |
DE3530924A1 (de) * | 1985-08-29 | 1987-03-12 | Alcan Aluminiumwerke | Hitzebestaendiges bauteil und verfahren zu dessen herstellung |
JP2857415B2 (ja) * | 1989-05-16 | 1999-02-17 | マツダ株式会社 | 加圧鋳造方法 |
DE4324609C2 (de) * | 1993-07-22 | 1997-10-16 | Avl Verbrennungskraft Messtech | Kurbelgehäuse für Brennkraftmaschinen |
DE19531551A1 (de) * | 1995-08-28 | 1997-03-06 | Bruehl Eisenwerk | Verfahren zum Herstellen von Gußstücken aus Leichtmetall und verlorene Form auf Basis von Sand hierfür |
JP3212245B2 (ja) * | 1995-08-30 | 2001-09-25 | マツダ株式会社 | 鋳造方法及び鋳造装置並びに鋳造品 |
-
1998
- 1998-01-29 DE DE19803397A patent/DE19803397A1/de not_active Withdrawn
- 1998-10-24 DE DE59807003T patent/DE59807003D1/de not_active Expired - Lifetime
- 1998-10-24 EP EP98120099A patent/EP0933153B1/de not_active Expired - Lifetime
- 1998-10-24 AT AT98120099T patent/ATE231426T1/de active
Also Published As
Publication number | Publication date |
---|---|
ATE231426T1 (de) | 2003-02-15 |
EP0933153A1 (de) | 1999-08-04 |
DE59807003D1 (de) | 2003-02-27 |
DE19803397A1 (de) | 1999-08-05 |
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