WO2004000486A1 - Procede de moulage de pieces de fonderie, notamment de blocs-moteurs, en alliage leger - Google Patents
Procede de moulage de pieces de fonderie, notamment de blocs-moteurs, en alliage leger Download PDFInfo
- Publication number
- WO2004000486A1 WO2004000486A1 PCT/FR2003/001899 FR0301899W WO2004000486A1 WO 2004000486 A1 WO2004000486 A1 WO 2004000486A1 FR 0301899 W FR0301899 W FR 0301899W WO 2004000486 A1 WO2004000486 A1 WO 2004000486A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- core
- mold
- cooler
- sections
- cavity
- Prior art date
Links
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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0009—Cylinders, pistons
Definitions
- the present invention relates generally to the casting of light alloy casting parts, mainly based on aluminum.
- Various foundry techniques are known, essentially from the top of the mold in gravity mode and from the bottom of the mold in low pressure mode.
- Various types of mold are also known, mainly sand molds and metal molds.
- the use of gravity metal mold casting has advantages for the production of foundry parts such as aluminum alloy engine blocks for combustion engines of motor vehicles or others. In particular, such a process is suitable for a request for small and medium series, because it is very modular and makes it possible to minimize the consumption of chemically bound sand thanks to the use of metal mold walls.
- the technique of gravity casting in metal mold has the advantage of a progressive investment cost, adapted and adjustable to the real needs of production.
- the method of casting engine blocks by gravity into a metal mold does not make it possible to obtain simultaneously and in a robust manner a high metallurgical quality in regions of the part such as the bearings of crankshaft (regions which are the most sensitive from the point of view of fatigue resistance) and a adequate dimensional control of interior shapes in relation to each other.
- the base of the mold makes it possible to place all the devices for guiding the metal pins which will form the drums directly in contact with the solidified alloy, or even the metal pins which will serve as support for the CH liners placed on these barrel pins and themselves overmolded by the liquid alloy.
- this base of the mold can serve as a very practical support for the positioning of interior cores such as those intended to form the water circulations.
- crankshaft bearings are tempered by the fact that the crankshaft bearings being under the MA weights, they having metallurgical quality (in particular in terms of microporosity), significantly reduced mechanical properties and fatigue resistance compared to what could be obtained with faster cooling of the alloy.
- the engine block is cast with the mold positioned in the other direction (i.e. with the bearings crankshaft down) in order to promote the obtaining of microstructures and improved properties in these critical areas in terms of fatigue, other difficulties are encountered if conventional gravity casting is used.
- the object of the present invention is to overcome these limitations of the known state of the art, and to propose an improved casting process which makes it possible on the one hand to achieve the objectives of optimizing the mechanical characteristics, in particular in fatigue, in regions such as crankshaft bearings of an engine block, and on the other hand also to achieve the objectives of dimensional control of the corresponding barrels, in particular when these bearings include liners inserted in the casting.
- a method of casting a piece of metal alloy such as an aluminum alloy and very particularly of casting an engine block of an internal combustion engine with cylinders, characterized in that it comprises the following stages: forming a core having at least one barrel intended to form in the part a cylinder and at least one cavity intended to form in the part a support and / or retaining zone for a working member such as a crankshaft, and at least one cooler in the close vicinity of the cavity, position the core in a metal mold cavity, and
- the core is formed by rigid assembly of a set of core sections.
- the core is positioned by positioning the individual sections in the mold in respective reference positions relative to the mold, then by joining the sections together. the sections are joined together by fixing one or more benches on the sections.
- the securing of the sections comprises a bearing of the sections together at the level of bearing surfaces.
- the bearing surfaces are provided at the level of coolers belonging to the respective sections.
- the or each cooler is integrated into the core during the formation of said core.
- the or each cooler is added to the core after the formation of said core.
- the or each cavity is defined at the ends partially by a cooler.
- the or each cooler provided in the core is located in a region of the core opposite to a region of counterweights of the mold.
- the cooler or at least one cooler is supported on a mold base.
- the present invention provides a mold for casting a piece of metal alloy such as an aluminum alloy, and more particularly the casting of an engine block of an internal combustion engine with cylinders, characterized in that it includes:
- - a metal envelope defining a mold cavity, - a core having at least one barrel intended to form in the part a cylinder and at least one cavity intended to form in the part a support and / or retaining zone for an organ working such as a crankshaft, and at least one cooler in the close vicinity of the cavity, - means for positioning the core in the mold cavity, and
- the core comprises a rigid assembly of a set of core sections.
- the core positioning means are capable of positioning the individual sections in the mold in respective reference positions relative to the mold, and means are provided for securing the sections together.
- the core comprises one or more benches fixed on the sections and able to join the sections together.
- the core sections comprise mutual bearing surfaces of the sections. the bearing surfaces are provided at the level of coolers belonging to the respective sections.
- the or each cooler is integrated into the core during the formation of said core.
- the or each cooler is added to the core after the formation of said core.
- the or each cavity is defined at the ends partially by a cooler.
- the or each cooler provided in the core is located in a region of the core opposite to a region of counterweights of the mold.
- the cooler or at least one cooler is supported on a mold base.
- the mold casing has no cooling circuits.
- FIGS. 3a and 3b are schematic perspective views of two possible embodiments of a core package usable in a method according to the invention
- FIG. 4 is a schematic view in partial perspective of a sole and a cooler belonging to a mold according to the invention
- Figure 5 is a cross-sectional view of a mold according to the invention
- Figure 6 illustrates in cross-section a step of positioning a bundle of cores in the mold
- Figure 7 illustrates in cross-section a step of fixing a bench seat on the core package.
- FIG. 3a there is shown a central core package intended to participate in the casting of a V-block engine of a combustion engine, this engine block comprising CH liners and RE coolers integrated when firing the nucleus.
- this package includes at the end intended to form the crankshaft a cooling system consisting of volumes of steel, cast iron, or any other suitable metal or alloy, forming RE coolers.
- RE coolers are placed in the core boxes used to form the different core packages (in general one package per pair of cylinders).
- a RE cooler has been represented, as well as two cylinder liners CH, the core N being pulled around the cooler and inside the liners.
- the cooler is here provided with a central hole T which allows a threaded rod or the like to pass through the set of aligned coolers, facilitating the tightening and stiffening of the central core package as well as its extraction after casting.
- FIG. 3b illustrates an alternative embodiment of the coring system, in which a recess E is made in the core package intended to receive, after the formation of the cores, a system of cooler (s) metallic (s) provided at the level of the mold base (not shown in FIG. 3).
- a system of cooler (s) metallic (s) provided at the level of the mold base (not shown in FIG. 3).
- FIG. 4 a packet of cores produced in accordance with FIG. 3b has been partially represented, as well as the sole SE of the mold comprising a single cooler RE received in the aligned recesses of the core sections. It is also possible to provide several coolers an support against each other. In FIG. 4, the recesses P formed in the cooler RE constitute the spaces intended to form the crankshaft bearings.
- the cooling surfaces are designed to maximize the generally semi-circular vertical contact surface with the bearings, this so as to accelerate as much as possible the cooling of the liquid alloy in the regions P which go form the bearings, and thus obtain optimal mechanical characteristics at the level thereof.
- the distance L illustrated in FIG. 4 is preferably greater than 15 mm.
- the mold also comprises a weighting system located opposite the cooling system described above, the weights being typically formed by sand cores.
- the liquid alloy feeds the mold by tilting through the weights, so as to naturally obtain a thermal gradient favorable to solidification, with the highest temperature at the weights and the lowest temperature in the opposite region.
- Figure 5 illustrates in this regard the overall structure of the mold and the casting.
- the mold includes its sole SE, two yokes C movable in the directions indicated by the arrows Fc in FIG. 5, drawers vertically movable (not shown), a ladle relay LR connected to one of the yokes C, a packet of cores PNC central, M1, M2 and M3 weighting cores, if necessary additional SU cores.
- the assembly can tilt around a horizontal axis A so as to fill by tilting, calm, from the ladle relay LR.
- FIG. 5 also shows benches B, the liners CH in which the barrels of cylinders FC of the bundle of cores are formed, on which the benches B are glued or otherwise fixed, and cores E for circulation passages of water.
- the crankshaft bearing zones are designated by PV, while the reference AR designates the bearing surface between adjacent sections of the core, at the level of the cooler RE. This support between the sections is also carried out at the level of the benches B.
- the central core as a whole consists of the assembly of the different core sections, bearing against each other at the AR support surfaces, and by fixing, by gluing, screwing or other, benches B on which the cores E for water passages will have been previously fixed.
- An engine block of the V8 type with a displacement of 5.7 liters is cast with an aluminum alloy of composition: Fe (0.35%) Si (7.3%) Cu (3.3%) Zn (0 , 20%) Mg (0.30%) Mn (0.14%), the rest being aluminum, at a temperature of 735 ° C, according to the conventional gravity casting process per se.
- the mold was previously positioned with the crankshaft bearings upwards, under the weights, as described with reference to FIG. 2 (prior art).
- the core has cast iron liners machined on their interior and exterior surfaces.
- the entire mold is metallic, and the shirts are carried by retractable drums through the sole.
- the block after casting is cooled by pulsed air and mechanically stripped, then subjected to a heat treatment known per se, for 5 hours at a temperature of 210 ° C. (treatment known to a person skilled in the art under the designation "T5".
- An engine block of the same geometry is produced with the same alloy and at the same temperature, with the process according to the invention, with a configuration for cooling the alloy at the bearings as described with reference to Figure 3b.
- the shirts are identical to those of the example according to the prior art. After cooling with pulsed air, the same heat treatment (5 h at 210 ° C.) is carried out.
- Table II below gives the mechanical properties obtained in this case on a representative population.
- the method according to the invention provides a standard deviation in terms of positioning of the liners relative to the reference frame of the block equal to 0.22 mm (average standard deviation for all of the drums), substantially less than the 0.25 mm standard deviation obtained with the process of the prior art.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60307467T DE60307467T2 (de) | 2002-06-21 | 2003-06-20 | Verfahren und form zur herstellung von guss-stuecken, insbesondere von leichtmetall-motorbloecken |
US10/519,421 US7270168B2 (en) | 2002-06-21 | 2003-06-20 | Method for moulding light alloy cast parts, in particular cylinder blocks |
MXPA05000201A MXPA05000201A (es) | 2002-06-21 | 2003-06-20 | Metodo para el moldeado de partes fundidas de aleacion ligera, en particular bloques cilindricos. |
AU2003263248A AU2003263248A1 (en) | 2002-06-21 | 2003-06-20 | Method for moulding light alloy cast parts, in particular cylinder blocks |
EP03760759A EP1515812B1 (fr) | 2002-06-21 | 2003-06-20 | Moule et procede de moulage de pieces de fonderie, notamment de blocs-moteurs, en alliage leger |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0207782A FR2841163B1 (fr) | 2002-06-21 | 2002-06-21 | Procede de moulage de pieces de fonderie, notamment de blocs-moteurs, en alliage leger |
FR02/07782 | 2002-06-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004000486A1 true WO2004000486A1 (fr) | 2003-12-31 |
Family
ID=29719986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/001899 WO2004000486A1 (fr) | 2002-06-21 | 2003-06-20 | Procede de moulage de pieces de fonderie, notamment de blocs-moteurs, en alliage leger |
Country Status (8)
Country | Link |
---|---|
US (1) | US7270168B2 (fr) |
EP (1) | EP1515812B1 (fr) |
AU (1) | AU2003263248A1 (fr) |
DE (1) | DE60307467T2 (fr) |
ES (1) | ES2270102T3 (fr) |
FR (1) | FR2841163B1 (fr) |
MX (1) | MXPA05000201A (fr) |
WO (1) | WO2004000486A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102470434A (zh) * | 2009-07-03 | 2012-05-23 | Ksm铸造有限公司 | 倾斜铸造由轻金属构成的部件的装置、铸槽和方法,以及由此铸造而成的部件 |
TWI447299B (zh) * | 2012-06-08 | 2014-08-01 | Colis Ind Co Ltd | 水冷式機車汽缸製法 |
US9925384B2 (en) | 2011-01-28 | 2018-03-27 | Micron Devices Llc | Neural stimulator system |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2880563B1 (fr) * | 2005-01-11 | 2007-03-02 | Peugeot Citroen Automobiles Sa | Procede de fabrication de bloc moteur comportant des chemises rapportees |
DE102011079356A1 (de) * | 2011-07-18 | 2013-01-24 | Mahle International Gmbh | Gießkern einer Gussform zur Herstellung eines Zylinders |
DE102015108755A1 (de) * | 2014-06-26 | 2015-12-31 | Ksm Castings Group Gmbh | Verfahren zur Bildung eines Kerns, der zur Ausbildung eines Hohlraums in einem durch Gießen hergestellten Gehäuse einer Hochdruckpumpe bestimmt ist |
US11654476B2 (en) | 2020-09-28 | 2023-05-23 | GM Global Technology Operations LLC | Hybrid core for manufacturing of castings |
US11554413B2 (en) | 2021-02-01 | 2023-01-17 | GM Global Technology Operations LLC | Hybrid cam bore sand core with metal chills for cast aluminum block |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3302250A (en) * | 1963-12-18 | 1967-02-07 | Gen Motors Corp | Core box and molding assembly for internal combustion engine blocks |
EP0486463A2 (fr) * | 1990-11-16 | 1992-05-20 | AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List | Moule de fonderie pour bloc cylindre d'un moteur à combustion à cylindres en V |
DE19941316A1 (de) * | 1999-08-31 | 2001-03-01 | Vaw Alucast Gmbh | Gießform und Gießverfahren für die Herstellung eines Motorblocks |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2783510A (en) * | 1953-02-26 | 1957-03-05 | Gen Motors Corp | Cylinder block coring for v-engines |
JPS6415267U (fr) * | 1987-07-16 | 1989-01-25 | ||
BR9107065A (pt) * | 1990-11-05 | 1993-09-28 | Comalco Alu | Fundicao de objetos de metal |
US5365997A (en) * | 1992-11-06 | 1994-11-22 | Ford Motor Company | Method for preparing an engine block casting having cylinder bore liners |
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 |
US6840062B1 (en) * | 2000-07-05 | 2005-01-11 | Kelly Foundry & Machine Co., Inc. | Glass bottle molds and method for making the same |
JP2004516141A (ja) * | 2000-12-18 | 2004-06-03 | ロラメンディ・ソシエダッド・アノニマ | 冷却システムおよび鋳型上への組立手段 |
US6527039B2 (en) * | 2001-06-11 | 2003-03-04 | General Motors Corporation | Casting of engine blocks |
-
2002
- 2002-06-21 FR FR0207782A patent/FR2841163B1/fr not_active Expired - Fee Related
-
2003
- 2003-06-20 MX MXPA05000201A patent/MXPA05000201A/es active IP Right Grant
- 2003-06-20 US US10/519,421 patent/US7270168B2/en not_active Expired - Fee Related
- 2003-06-20 EP EP03760759A patent/EP1515812B1/fr not_active Expired - Fee Related
- 2003-06-20 WO PCT/FR2003/001899 patent/WO2004000486A1/fr active IP Right Grant
- 2003-06-20 AU AU2003263248A patent/AU2003263248A1/en not_active Abandoned
- 2003-06-20 DE DE60307467T patent/DE60307467T2/de not_active Expired - Lifetime
- 2003-06-20 ES ES03760759T patent/ES2270102T3/es not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3302250A (en) * | 1963-12-18 | 1967-02-07 | Gen Motors Corp | Core box and molding assembly for internal combustion engine blocks |
EP0486463A2 (fr) * | 1990-11-16 | 1992-05-20 | AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List | Moule de fonderie pour bloc cylindre d'un moteur à combustion à cylindres en V |
DE19941316A1 (de) * | 1999-08-31 | 2001-03-01 | Vaw Alucast Gmbh | Gießform und Gießverfahren für die Herstellung eines Motorblocks |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102470434A (zh) * | 2009-07-03 | 2012-05-23 | Ksm铸造有限公司 | 倾斜铸造由轻金属构成的部件的装置、铸槽和方法,以及由此铸造而成的部件 |
US9925384B2 (en) | 2011-01-28 | 2018-03-27 | Micron Devices Llc | Neural stimulator system |
TWI447299B (zh) * | 2012-06-08 | 2014-08-01 | Colis Ind Co Ltd | 水冷式機車汽缸製法 |
Also Published As
Publication number | Publication date |
---|---|
EP1515812A1 (fr) | 2005-03-23 |
FR2841163A1 (fr) | 2003-12-26 |
DE60307467D1 (de) | 2006-09-21 |
MXPA05000201A (es) | 2005-06-06 |
AU2003263248A1 (en) | 2004-01-06 |
ES2270102T3 (es) | 2007-04-01 |
DE60307467T2 (de) | 2007-01-11 |
US20060175033A1 (en) | 2006-08-10 |
FR2841163B1 (fr) | 2005-01-28 |
US7270168B2 (en) | 2007-09-18 |
EP1515812B1 (fr) | 2006-08-09 |
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