EP3017164A1 - Piece metallique realisee par moulage comprenant des evidements internes, procede de fabrication et moteur a combustion interne comprenant une telle piece - Google Patents
Piece metallique realisee par moulage comprenant des evidements internes, procede de fabrication et moteur a combustion interne comprenant une telle pieceInfo
- Publication number
- EP3017164A1 EP3017164A1 EP14738548.8A EP14738548A EP3017164A1 EP 3017164 A1 EP3017164 A1 EP 3017164A1 EP 14738548 A EP14738548 A EP 14738548A EP 3017164 A1 EP3017164 A1 EP 3017164A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal
- orifice
- wall
- metal part
- recesses
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
Definitions
- the invention relates to molded metal parts comprising at least two internal recesses. DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION The invention relates to molded metal parts comprising at least two internal recesses.
- Metal parts of this type comprising internal recesses comprise, for example, cylinder heads of an internal combustion engine, in particular for a motor vehicle.
- An internal combustion engine conventionally comprises a cylinder head mounted on a crankcase, these two parts being cooled and lubricated by coolant and oil circulations, respectively.
- the coolant circulates in the cylinder block, feeds the cylinder head and leaves the engine.
- the cylinder head and the cylinder block each comprise an internal chamber (or recess), usually called a water core, for the circulation of the cooling liquid, these water nuclei communicating with each other.
- the coolant circulates separately in the cylinder head and the crankcase: the water cores of the cylinder head and the crankcase must not communicate with each other.
- a sand mold is made comprising a lower part, an upper part and one or more cores, each core being a positive of an internal recess.
- This sand mold can be made by cold box molding, by hot box molding or by the so-called "croning" process.
- the cores obtained by the Croning process are more rigid and therefore more difficult to destroy, which increases the cost of producing a part.
- cold or hot box molding processes are generally preferred to reduce costs.
- these latter processes produce nuclei with limited stiffness.
- one solution is to close the existing openings between the recesses by positioning a shutter in each inner orifice, this shutter being for example fixed by screwing or shrunk.
- This solution requires the passage of a tool, which can be difficult or impossible, depending on the configuration of the room.
- the shutters used exert constraints on the wall separating the internal recesses, constraints that can lead to the formation of cracks and a rupture of this wall.
- the subject of the invention relates to a metal part comprising an outer wall delimiting at least two internal recesses separated by an inner wall, said metal part further comprising:
- an adjustment portion coaxial with the attachment portion and inserted within the inner port associated with said outer port, the adjusting portion being configured to close most of the passage section of said inner port without coming into contact with a wall of said internal orifice.
- the metal part thus obtained has the advantage of having a reduced or zero fluid communication between its recesses without provided that a constraint is exerted at the inner wall separating these recesses through the particular configuration of the shutter, which is set up via an external orifice, each inner orifice being accessible via the associated external orifice.
- the shutter attachment portion is sealingly secured within the outer port.
- the fixing portion is configured to fit tightly within the external orifice, without play between the fixing portion and the external orifice. This lack of clearance ensures the seal between the recess and the outside of the metal part and can be obtained by a hoop between the fixing portion and the external orifice or by a screw connection or by a sealant .
- the sealed fastening can be obtained by any other means, such as the presence of a seal.
- the shutter adjustment portion is itself coaxial with the attachment portion and inserted within the internal port associated with said outer port. It is further configured to close most of the passage section of said internal port without coming into contact with said internal port. In other words, its dimensions and shape are chosen so as to close the maximum of the passage section of the internal orifice without coming into contact with this internal orifice.
- the clearance, perpendicular to the axis of the internal orifice, between the shutter adjustment portion and the internal orifice is thus always positive, the minimum dimension of the internal orifice being greater than the maximum dimension of the shutter adjustment part. This type of assembly is sometimes called sliding fit.
- the shutter adjustment portion is shaped so that a clearance, measured perpendicularly to the axis of the internal orifice, exists between the adjustment portion and the internal orifice, this clearance may be between a minimum clearance and a maximum clearance, the minimum clearance being defined so that the adjustment portion does not come into contact with the internal orifice, the maximum clearance resulting from manufacturing dispersions.
- the maximum clearance is the result of the dispersions of positioning and concentricity of the tools used to make the openings of the metal part and the shutter manufacturing dispersion.
- the maximum clearance thus defines a section of free passage between the shutter adjustment portion and the internal orifice, namely a pressure drop when a fluid flows in the recesses and, ultimately, a leakage flow.
- this leakage rate is too great compared to a maximum permissible leakage rate for the intended application, it is possible to reduce this leakage rate by reducing the number of internal orifices as much as possible according to the manufacturing constraints. recesses, either by reducing the manufacturing dispersions, in other words the dispersions of positioning and concentricity of the tools used to make the orifices of the metal part and to make the shutter. These dispersions can be calculated by the usual techniques known to those skilled in the art.
- the maximum flow rate of fluid that can be allowed between the two recesses is, for example, less than 5% of the total fluid flow, preferably less than 1%. the total flow of fluid.
- the shutter adjustment portion and the internal orifice may each have a cylindrical shape.
- the shutter attachment portion and the outer port may each have a cylindrical shape.
- the fastener portion of the shutter may have a cylindrical shape of diameter greater than a cylindrical shape of the adjustment portion.
- the shutter can then be formed in a simple manner of two cylindrical parts of different diameters, for example of two full cylinders.
- the external orifice may have a shoulder at its end adjacent to a recess, shoulder against which is supported the fixing portion of the shutter parallel to the axis of the external orifice.
- the outer orifice has a reduced section on the end side adjacent to a recess. This prevents the shutter from falling inside the recess.
- the metal part may comprise at least two or at least three internal orifices passing through an inner wall separating two recesses.
- the minimum number of orifices can be chosen so as to ensure a smooth cold or hot box molding of the metal part, namely to avoid a relative displacement of the mold cores during molding.
- the maximum number of orifices may be chosen so as not to exceed a maximum fluid flow rate allowed between the recesses of the finished metal part, maximum flow determined according to the intended application.
- the metal part according to the invention may more particularly be a cylinder head of an internal combustion engine, for example made of aluminum.
- the invention also relates to a method of manufacturing a metal part comprising an outer wall delimiting at least two internal recesses separated by an inner wall, comprising the following steps:
- step (iv) making at least one external orifice in the outer wall of axis coinciding with the axis of an internal orifice left by the stud, this external orifice being obtained by correspondingly producing the mold of step (i) and / or being obtained by machining,
- step (i) of producing the mold a cold box or hot box molding process may be used, which will facilitate the extraction of the mold in step (iii).
- This method is particularly intended for the manufacture of the metal part according to the invention and in particular adapted to the manufacture of an internal combustion engine cylinder head.
- the invention thus also relates to an internal combustion engine comprising a metal part, in particular a cylinder head, according to the invention or obtained by the method according to the invention.
- FIG. 1 is a sectional view of a metal part according to one embodiment of the invention.
- FIG. 3 is a partial perspective representation of the cores of a mold used to produce a metal part according to one embodiment of the invention.
- FIG. 1 schematically represents a metal part 10 comprising an outer wall 12 delimiting at least two internal recesses 14, 16 separated by an internal wall 18.
- the metal part 10 further comprising:
- Each internal orifice 20 is thus accessible via the associated external orifice 22.
- the metal part 10 also comprises a shutter 24, shown only in FIG. 2, associated with each pair of internal and external orifices 20 and 22 and comprising:
- This adjustment portion 24b is configured to close most of the passage section of said inner port 20 without coming into contact with a wall 20b of said inner port 20.
- a clearance J between the adjustment portion 24b and the internal orifice 20, perpendicular to the axis 20a of the internal orifice 20 ( Figure 2).
- the clearance J can be of the order of 40 to 100 ⁇ .
- Said clearance thus allows a fluid communication between the two recesses via the zero or virtually zero internal orifice, that is to say that the flow rate of fluid passing through the internal orifice connecting the two recesses is much smaller than the flow rate.
- fluid flowing in said recesses for example equal to at most 5% of the flow rate of fluid flowing in said recesses.
- the internal recesses 14 and 16 are intended for the circulation of cooling fluid and are connected to a degassing circuit (not shown) intended to direct gas bubbles that can accumulate in the upper parts of said recesses, towards the outside. of the metal part 10.
- the internal recesses 14, 16 comprise a lower recess 16 disposed below an upper recess 14 in a position of use of said metal part 10.
- This particular arrangement makes it possible to facilitate the degassing of the fluids circulating in the metal part 10, a part of the gases contained in the fluids flowing in the recesses, in particular the lower recess, being able to rise from the lower recess 16 to the upper recess 14. passing through the gap between the adjusting portion 24b and the inner orifice 20 and then venting through the degassing circuit (not shown) connected with the upper recess 14. The inner orifice 20 and said portion of adjustment 24b are then part of the degassing circuit of the fluids circulating in the internal recesses.
- the passage section is defined as the surface perpendicular to the axis 20a of the internal orifice 20.
- the adjustment portion 24b is thus configured so as to close off this passage section as far as possible without coming into contact with the wall 20b of the orifice.
- the adjustment portion 24b is long enough to close the internal orifice 20 over its entire length (measured parallel to its axis 20a).
- the internal and external orifices 20 and 22 are cylindrical and the shutter 24 consists of a part upper portion forming the hollow cylinder-shaped attachment portion 24a and a lower portion forming the cylinder-shaped fitting portion 24b of smaller diameter than the fixing portion 24a.
- the external orifice 22 further comprises a shoulder 23 at its end adjacent to the recess 14, shoulder 23 against which is supported the fixing portion 24a of the shutter 24 parallel to the axis 20a.
- the shutter 24 is made of metal, for example steel, preferably stainless steel, or any other metal or alloy suitable for the intended application.
- the fastening portion 24a of the illustrated example is configured to be shrunk into the outer hole 22.
- its adjustment portion 24b is inserted inside the internal orifice 20, preferably over the entire length of the latter along its axis 20a, as in the example shown in FIG. 2.
- the fixing portion 24a could be formed of a solid cylinder.
- the attachment can be obtained by any other means usually used (screwing or otherwise).
- the metal part 10 described above can be obtained by a manufacturing method comprising the steps described hereinafter.
- a sand mold 30 is formed comprising at least two cores 32, 34, two adjacent cores being connected by at least one bonding pad 36 which will form an internal orifice between the recesses of the finished metal part.
- Figure 3 shows only the cores 32 and 34 of the sand mold 30, cores connected by two pads 36. The cores 32 and 34 will form after molding the recesses 14 and 16 of the metal part 10 respectively.
- the molten metal is then injected into the sand mold 30 in a second step (ii).
- step (iii) after cooling the metal, the sand mold 30 is removed and the sand cores 32, 34 are extracted from the recesses formed.
- step (iv) at least one external orifice 22 is produced in the outer wall 12, of axis 22a coinciding with the axis 20a of an internal orifice 20 left by a stud 36, this external orifice 22 being obtained by suitably producing the mold of step (i) and / or being obtained by machining (the positioning of the external orifice being for example determined by a string of dimensions).
- a shutter 24 comprising a fastening portion 24a and an adjustment portion 24b that is coaxial with the fixing portion, the adjustment portion being configured to close most of the passage section of said inner port without contacting the wall 20b of said inner port 20.
- step (vi) the fixing portion 20a is fixed in a sealed manner inside the external orifice 22, the adjustment portion 24b being inserted inside the internal orifice Associated with said external orifice, without coming into contact with the wall 20b of said internal orifice 20.
- a metal part having recesses whose internal orifices are virtually closed can thus be achieved by an inexpensive method, such as cold-box or hot-box molding, the closure not applying any mechanical stress detrimental to the holding of the inner wall separating the recesses.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1356426A FR3008138B1 (fr) | 2013-07-02 | 2013-07-02 | Piece metallique realisee par moulage comprenant des evidements internes, procede de fabrication et moteur a combustion interne comprenant une telle piece |
| PCT/FR2014/051391 WO2015001216A1 (fr) | 2013-07-02 | 2014-06-10 | Piece metallique realisee par moulage comprenant des evidements internes, procede de fabrication et moteur a combustion interne comprenant une telle piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3017164A1 true EP3017164A1 (fr) | 2016-05-11 |
| EP3017164B1 EP3017164B1 (fr) | 2019-08-07 |
Family
ID=49713143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14738548.8A Active EP3017164B1 (fr) | 2013-07-02 | 2014-06-10 | Pièce metallique réalisée par moulage comprenant des évidements internes, procédé de fabrication et moteur à combustion interne comprenant une telle pièce |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3017164B1 (fr) |
| FR (1) | FR3008138B1 (fr) |
| WO (1) | WO2015001216A1 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1169930A (fr) * | 1957-03-21 | 1959-01-07 | Hispano Suiza Sa | Perfectionnements apportés aux circuits de refroidissement des moteurs à combustion interne |
| GB1100511A (en) * | 1964-03-03 | 1968-01-24 | Blackstone & Co Ltd | Improvements in or relating to a liquid-cooled cylinder head for an internal combustion piston engine |
| DE3836941C1 (fr) * | 1988-10-29 | 1989-06-15 | Bayerische Motoren Werke Ag, 8000 Muenchen, De | |
| DE10312086A1 (de) * | 2003-03-19 | 2004-09-30 | Daimlerchrysler Ag | Maschinengehäuse |
-
2013
- 2013-07-02 FR FR1356426A patent/FR3008138B1/fr not_active Expired - Fee Related
-
2014
- 2014-06-10 EP EP14738548.8A patent/EP3017164B1/fr active Active
- 2014-06-10 WO PCT/FR2014/051391 patent/WO2015001216A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2015001216A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3017164B1 (fr) | 2019-08-07 |
| FR3008138A1 (fr) | 2015-01-09 |
| FR3008138B1 (fr) | 2017-12-22 |
| WO2015001216A1 (fr) | 2015-01-08 |
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