EP2905455B1 - Procédé de revêtement d'un alésage et bloc cylindre d'un moteur à combustion interne - Google Patents

Procédé de revêtement d'un alésage et bloc cylindre d'un moteur à combustion interne Download PDF

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Publication number
EP2905455B1
EP2905455B1 EP15153047.4A EP15153047A EP2905455B1 EP 2905455 B1 EP2905455 B1 EP 2905455B1 EP 15153047 A EP15153047 A EP 15153047A EP 2905455 B1 EP2905455 B1 EP 2905455B1
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EP
European Patent Office
Prior art keywords
bore
enamel coating
coating
enamel
cylinder block
Prior art date
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Active
Application number
EP15153047.4A
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German (de)
English (en)
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EP2905455A3 (fr
EP2905455A2 (fr
Inventor
Carsten Weber
Jan Mehring
Kai Kuhlbach
Urban Morawitz
Maik Broda
Clemens Maria Verpoort
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Publication of EP2905455A3 publication Critical patent/EP2905455A3/fr
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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 
    • F02F1/18—Other cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C23D5/005—Coating with enamels or vitreous layers by a method specially adapted for coating special objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C23D5/02—Coating with enamels or vitreous layers by wet methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making

Definitions

  • the present invention relates to a method for producing a coated surface, in particular a cylinder bore of an internal combustion engine, and a cylinder block of an internal combustion engine.
  • the FR 2 179 305 A5 discloses a method for applying a layer of liquid anti-rust compound on the inner surfaces of pipes and an apparatus for performing the method.
  • Cylinder bores in internal combustion engines should have an even and slight play between their inner circumference and pistons or piston rings that move back and forth therein, ideally achieving ideal tribological conditions.
  • the DE 10 2007 023 297 A1 discloses that a two-stage method is to be provided, with a finishing being to follow a pre-processing.
  • a two-stage method is to be provided, with a finishing being to follow a pre-processing.
  • the second step towards the production of a non-circular starting form is started, i.e. before the fine machining is started, she sees DE 10 2007 023 297 A1 before applying a sliding layer on the pre-processed initial shape.
  • This can be done according to the DE 10 2007 023 297 A1 only with a thermal spraying process, whereby one considers arc wire spraying, atmospheric plasma spraying or high-speed flame spraying.
  • Plasma powder spraying can also be a suitable spraying method.
  • the DE 10 2007 023 297 A1 in particular that the layer thickness of the applied layer should not be less than at least 50 ⁇ m.
  • the surface should be pretreated thermally, mechanically, chemically or with a water jet before coating.
  • Thermal spray processes can be used to produce tribologically suitable wear protective layers.
  • such coatings are not used in practice for engine blocks made of gray cast iron material (GG material) because the honed GG surface itself is already well suited tribologically due to the graphite lamellae with their self-lubricating effect. Therefore, in GG engine blocks, worn raceways in particular are restored to their original condition by spraying on steel layers. The original diameter can then be set again by honing.
  • Such thermally spray-repaired engines are known to have a lower oil consumption or higher output than engines that have been repaired by spinning out the bore and using oversized pistons. This results in a further reduced friction between the piston ring and the porous thermal spray layer, the pores acting as an oil reservoir and providing additional oil for the piston ring, particularly in the area of the piston reversal points and thus in the area of the mixed friction.
  • thermal spray coatings show a weak point, for example with regard to the problem of sub-corrosion, e.g. if aggressive, contaminated fuels are used.
  • highly Cr-alloyed powders or wires as a filler material for thermal spray coating, which further increases the manufacturing costs.
  • condensates or acids can still attack the base material through the layer.
  • under-corrosion problems can only be prevented by additional impregnation of the layers.
  • thermal powder coatings for Zr-O2 with yttrium oxide stabilization can be used to produce thermal insulation layers for internal combustion engines or gas turbines.
  • Such plasma powder spray coatings are characterized by low heat conduction even at very high temperatures up to over 1100 ° C.
  • plasma powder spray layers cannot be mechanically loaded, such thermal insulation layers would not be suitable as a tribologically stressed coating in the cylinder race.
  • the invention is based on the object of advantageously developing a method of the type mentioned at the outset.
  • the enamel coating applied to the inner surface of the bore has particularly good thermal insulation properties and particularly good tribological properties. Undercorrosion is also reliably avoided, and costly additives such as zirconium oxide / yttrium oxide can be dispensed with.
  • a method is purposefully provided in which a suitable coating fulfills all requirements for a reliable function of the component with minimal manufacturing costs, the method according to the invention simultaneously but can also be integrated into the existing production chain for the manufacture of the engine blocks without great difficulty.
  • the enamel coating according to the invention is preferably a melt mixture.
  • the glass-forming oxides melt together to form a glass melt.
  • Glass-forming oxides can be SiO 2 , B 2 O 3 , Na 2 O, K 2 O and Al 2 O 3 .
  • Basic emails contain approx. 23 - 34% by weight (weight percent) borax, 28 - 52% by weight feldspar, 5 - 20% by weight quartz, approx. 5% by weight fluoride, as well as the rest of soda and sodium nitrate.
  • the oxides of Ti, Zr and Mo can serve as opacifiers.
  • components of cobalt, manganese or nickel oxides are provided, for example. It is still possible to use ceramic pigments, e.g. Use iron oxides, chromium oxides and spinels.
  • the substances mentioned are finely ground and melted.
  • the melt is quenched, that is to say preferably placed in water, the granular glassy frit thus formed being finely ground again in the subsequent step.
  • 30% to 40% water is added together with clay and quartz powder.
  • the opacifiers and color oxides mentioned are added.
  • an enamel slip is formed, which should rest for a better time, preferably a few days, for better mixing before the enamel slip would be used again.
  • suitable adjusting means ensures that a uniform layer thickness, e.g. after a dip coating, whereby a possible dip coating with a flood device is discussed in more detail.
  • the aqueous enamel slip can be applied by means of a rotating device, which can be moved back and forth in the vertical direction of the bore for rotation about its vertical axis.
  • the device can be designed as a lance, the material being able to be applied in several transitions, that is to say layers.
  • the lance points at least one outlet opening from which the enamel slip can emerge at its end of the order.
  • the enamel slip is thrown onto the surface to be coated.
  • several outlet openings can also be provided, which can be arranged on the lance as seen in the circumferential direction as well as in the vertical direction thereof.
  • a certain thickness of material is first applied, which is then dried before the next layer, that is to say further material, is applied.
  • This layer can be dried with an induction coil, for example.
  • the enamel coating is applied in a single step.
  • the enamel coating can also be applied in one dipping process.
  • the exterior of the cylinder block is inevitably coated, which is disadvantageous in terms of material savings.
  • the bore is flooded with the enamel slip, which is also referred to in the sense of the invention as a diving process with a flooding device.
  • the entire cylinder block is first placed on a flood device with its head side.
  • the flooding device advantageously has at least one chamber which has at least one outlet opening, a feed opening also being provided.
  • a line is connected to the feed opening, which leads the enamel slurry to the flooding device, so that a pressure is created in it, that is to say in the chamber, that the enamel slip enters the bore to be coated from the outlet opening from below.
  • sealing elements are also provided, for example in the configuration as a sealing lip on the flooding device, on which the wall of the bore to be coated can rest in the circumferential direction, so that the bore is sealed off from its wall to the flooding device.
  • the entire bore i.e. the inner surface of the same, is coated with the enamel slip.
  • a multi-stage layer structure with the optional intermediate drying of individual partial layers as well as the application of the enamel coating in one step can be provided.
  • the borehole is flooded from bottom to top. Of course it is possible to flood the hole from top to bottom with the enamel slip. To do this, the email slip is opened in the top Drilled hole, which is also considered a diving process in the sense of the invention.
  • the base body that is to say the cylinder block
  • the sand casting process being suitable as the production method. This is generally known, so it will not be discussed further.
  • the bore that is to say the cylinder bore, is then drilled out and pre-machined, the bore being drilled out to an oversize of 1 to 2 mm in diameter. It is expedient in the sense of the invention if the surface in the area of the bore, ie the inner surface of the bore, is spindled to a roughness of Ra 6 to 7 ⁇ m.
  • the enamel coating is applied.
  • the enamel coatings according to the invention are distinguished from the electroplating or thermal spray coatings by the fact that they cannot be infiltrated.
  • the enamel coating according to the invention cannot be further damaged if the layer is removed down to the base material due to local damage. Rust damage will only occur in the area of the missing enamel layer, but this will not increase further.
  • the enamel coating according to the invention is characterized by good wear resistance due to the high layer hardness of typically 600-800HV0.1. This means that the hardness is three times higher than that of the GG base material.
  • the cylinder block with the dried enamel coating is heated to 800 - 900 ° C in a protective gas oven and held for approx. 10 - 20 minutes. This is followed by rapid cooling, preferably in a molten salt, so that the cylinder block has a significantly higher strength than with conventional GG material.
  • the enamel baking treatment and this heat treatment run in the same temperature-time window, which is used with the invention. In this respect, the enamel baking treatment and this heat treatment are combined, so that this baking and quenching operation results in a cylinder block with increased mechanical strength and a cylinder bore with good thermal insulation and good wear and corrosion resistance.
  • the engine blocks are finished and honed to their final dimensions in the race track.
  • Layer thicknesses of 500-1000 ⁇ m are preferably applied.
  • This thermal insulation results from the use of oxides such as Si, Ti, Ca oxides but also from the typical air bubble inclusions in the solidified glass matrix.
  • This hard and brittle layer is very easy to work with diamond honing stones, whereby these air bubbles are cut and exposed.
  • these are not interconnected pores or pore nests as in the case of a thermally applied spray coating, so that a high hydrodynamic pressure can build up in the pores of the enamel coating according to the invention and the oil film through the piston ring does not connected pores can be pushed away.
  • the method according to the invention is suitable for coating cylinder liners of internal combustion engines.
  • the baking cycle of the enamel coating can be combined with the AGI heat treatment, so that the cylinder block subsequently has a higher strength.
  • the composition of the enamel coating can be adjusted by adding hard carbides so that the wear resistance e.g. can be raised for use in highly charged engines. Compared to Zr oxide powder (currently € 60 / kg and using the expensive powder plasma spray process), wet slurrying of enamels (currently € 2-4 / kg) is very cost-effective.
  • the invention thus provides a method for producing a wear and corrosion coating within the bore of a cylinder block of an internal combustion engine made of gray cast iron material.
  • this coating at least meets the following requirements: due to the low thermal conductivity, it reduces the heat loss in the combustion process and thus allows the heat in the combustion process to be better used thermodynamically in order to achieve a higher degree of efficiency.
  • this coating also has good tribological properties in order to cope with the friction-wear conditions of the piston group. According to the invention, these requirements are met by burning in the hard enamel coating, if necessary.
  • the necessary baking treatment of the enamel coating is combined with the AGI heat treatment, so that only very low costs are incurred for this enamelling and at the same time the cylinder block is given a higher strength than a cylinder block made of conventional GG material. It is also conceivable to provide an aluminum cylinder block, that is to say its cylinder barrel, with the enamel coating.
  • the enamel coating surface can be subjected to a final treatment, i.e. a finish, after the baking step. Provision is preferably made to machine the friction surfaces in a rotating manner and to remove the scale layer which has arisen as a result of the annealing process. It is also possible to rework the hole by regrinding, using diamond or Hard material cup wheels can be used. Post-processing by turning or spinning is conceivable, which is feasible despite the high hardness due to the brittleness, with PCD (polycrystalline diamond) indexable inserts being preferred.
  • a final treatment i.e. a finish
  • Figure 1 shows a method for coating a bore 1 with an enamel coating 2.
  • the bore 1 is made in a cylinder block 3, which is shown in FIG Figure 2 is recognizable. Of the cylinder block 3 is in Figure 1 only the inner surface 4 of the bore 1 can be seen.
  • the cylinder block 3 was produced as a base body 3 in a sand casting process from a gray cast iron.
  • the bore 1 was drilled out to an oversize of 1 to 2 mm in diameter.
  • the surface 4 in the area of the bore 1 was also spindled to a roughness of Ra 6 to 7 ⁇ m.
  • the bore 1 is provided with an enamel coating 2.
  • the enamel coating 2 is in the form of an aqueous enamel slip in the exemplary embodiment Figure 1 by means of a rotating device 6 which at the same time for rotation about its axis in the vertical direction of the bore 2 in the same back and forth is applied.
  • the movement arrows regarding rotation and back and forth are in Figure 1 drawn.
  • the device 6 can be referred to as a lance 6, the material, that is to say the aqueous enamel slip, being able to be applied in several transitions, that is to say layers.
  • a certain thickness of material is first applied, which is then dried before the next layer, that is to say further material, is applied.
  • This layer can be dried with an induction coil, for example.
  • the enamel coating is applied in a single step.
  • the enamel coating 2 can also be applied in a dipping process. Recognizable in Figure 2 is that the bore 1 is flooded with the enamel slurry from below, which is referred to as a dipping process in the sense of the invention. The entire cylinder block 3 is placed with its head side 7 standing on a flooding device 8.
  • the flooding device 8 advantageously has at least one chamber 9 which has an outlet opening 10, a feed opening 11 being provided.
  • a line 12 is connected to the feed opening 11, which leads the enamel slurry to the flooding device 8, so that pressure, such as this, arises in the chamber 9 that the enamel slip enters the bore 1 to be coated from the outlet opening 10 from below.
  • Sealing elements 13, e.g. provided in the embodiment as a sealing lip 13 on the flood device 8, on which the wall 14, that is to say on the end face of the bore 1 to be coated, can bear in the circumferential direction, so that the bore 1 is sealed via its wall 14 to the flood device 8.
  • the entire bore 1, that is to say the inner surface 4 thereof, is thus coated with the enamel slip.
  • a multi-stage layer structure with the optional intermediate drying of individual partial layers as well as the application of the enamel coating in one step can be provided.
  • the internal combustion engine that is to say the cylinder block 3 may have more than one cylinder bore 1, which is within the meaning of the invention.
  • the flood device 8 can also have more than the recognizable one chamber 9, which can be arranged one behind the other and / or next to one another. This depends on the type of internal combustion engine, for example as an in-line engine or as a V-engine.
  • a separate flooding device 8 with a single chamber 9 can also be provided for each bore 1. It is expedient if all the bores 1 are provided with the enamel coating 2 at the same time, which can of course also be done in succession. In terms of heat treatment, however, coating that is as simultaneous as possible is advantageous.
  • the enamel coating being metallurgically bonded to the base material of the bore by phase formation.
  • This post-treatment combines a heat treatment with subsequent quenching.
  • the two treatments i.e. the enamel baking process, as well as the said heat treatment take place in the same temperature-time window, so that this baking and quenching operation results in a cylinder block with increased mechanical strength and a cylinder bore with good thermal insulation and good wear - and corrosion resistance results.
  • the enamel coating 2 can then be subjected to a finish, for example using diamond honing stones.
  • the pores / air bubbles 15 present in the enamel coating 2 are cut and exposed, as in Figure 3 is recognizable.
  • the inner surface 4 of the bore 1, the enamel coating 2 and the transition zone 16 arranged between them can be seen.
  • the pores / air bubbles 15 are not interconnected pores or pore nests as in the case of a thermally applied spray coating, so that a high hydrodynamic pressure can build up in the cut and exposed pores / air bubbles of the enamel coating according to the invention and the oil film cannot be pushed into connected pores by the piston ring.

Claims (12)

  1. Procédé de fabrication d'une surface intérieure revêtue (4) d'un alésage revêtu (1) d'un moteur à combustion, comprenant au moins les étapes suivantes :
    - la fabrication d'un corps de base (3) qui se présente sous la forme d'une ébauche ;
    - le perçage de l'alésage (1) et le pré-usinage de celui-ci ;
    - l'application d'un revêtement d'émail (2) sur la surface intérieure (4) de l'alésage (1),
    - le post-traitement thermique de l'alésage revêtu (1), le revêtement d'émail (2) étant recuit conjointement avec le corps de base (3) en un matériau de substrat GG dans le four continu à une température comprise entre 750 °C et 900 °C, de préférence à T = 840 °C, pendant 5 à 30 minutes, ou le revêtement d'émail (2) étant recuit conjointement avec un corps de base (3) en un alliage d'aluminium à une température comprise entre 480 °C et 560 °C, de préférence à T = 540 °C, dans le four continu pendant 5 à 30 minutes,
    de telle sorte que le revêtement d'émail puisse être relié métallurgiquement avec le matériau de base de l'alésage (1) par formation de phase ; et
    - l'usinage de finition du revêtement d'émail (2) de telle sorte que des pores (15) présents dans le revêtement d'émail (2) soient tronqués ou exposés.
  2. Procédé selon la revendication 1, dans lequel l'alésage (1) est percé par brochage en un excès de 1 à 2 mm dans le diamètre.
  3. Procédé selon la revendication 1 ou 2, dans lequel l'alésage (1) présente sur sa surface intérieure (4) par brochage une rugosité de Ra 6 à 7 µm.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel le revêtement d'émail (2) est appliqué sous la forme d'une barbotine d'émail aqueuse sur la surface intérieure (4), puis séché dans un four continu à T = 80 à 100 °C, de préférence à T = 90 °C, pendant 8 à 12, de préférence 10 minutes.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel le revêtement d'émail (2) est appliqué au moyen d'un dispositif d'application rotatif et réalisant un mouvement avant arrière.
  6. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel le revêtement d'émail (2) est appliqué par un processus d'immersion avec un dispositif de noyage (8), le dispositif de noyage (8) comprenant au moins une chambre (9) qui comprend au moins une ouverture de sortie (10), une ouverture d'alimentation (11) étant prévue, à laquelle une conduite (12) est raccordée, de telle sorte qu'une barbotine d'émail aqueuse puisse être acheminée dans la chambre (9), qui entre dans l'alésage (1) en sortant de la chambre (9) par l'ouverture de sortie (10).
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'ensemble de l'alésage (1) est muni du revêtement d'émail (2).
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel le corps de base (3) est introduit conjointement avec le revêtement d'émail séché (2) dans un dispositif de chauffage, dans lequel le corps de base (3) est porté à une température de 800 à 900 °C et maintenu pendant 10 à 20 minutes, un refroidissement rapide ayant ensuite lieu.
  9. Bloc-cylindres d'un moteur à combustion comprenant un alésage (1), qui présente une surface intérieure revêtue (4), fabriquée au moyen d'un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le revêtement sur la surface intérieure (4) de l'alésage (1) est un revêtement d'émail (2).
  10. Bloc-cylindres selon la revendication 9, caractérisé en ce que le revêtement d'émail comprend au moins un des oxydes formant du verre du groupe constitué par SiO2, B2O3, Na2O, K2O et Al2O3.
  11. Bloc-cylindres selon la revendication 9 ou 10, caractérisé en ce que le bloc-cylindres comprend un matériau de base du groupe de matériaux constitué par un alliage de magnésium, un alliage d'aluminium, la fonte grise et l'acier moulé.
  12. Surface de glissement de cylindre d'un bloc-cylindres selon l'une quelconque des revendications 9 à 11, caractérisée par un revêtement d'émail (2) qui comprend des pores (15), des pores (15) présents dans le revêtement d'émail (2) étant tronqués ou exposés après un usinage de finition.
EP15153047.4A 2014-02-06 2015-01-29 Procédé de revêtement d'un alésage et bloc cylindre d'un moteur à combustion interne Active EP2905455B1 (fr)

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CN104831278B (zh) 2019-09-17
US9759154B2 (en) 2017-09-12
US20150219039A1 (en) 2015-08-06
DE102014202134A1 (de) 2015-08-06
EP2905455A3 (fr) 2015-11-18
CN104831278A (zh) 2015-08-12
EP2905455A2 (fr) 2015-08-12

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