EP2441549B1 - Method for mechanical processing a waste gas conveying surface area of a combustion engine or crankcase component as well as combustion engine crankcase and cylinder liner - Google Patents

Method for mechanical processing a waste gas conveying surface area of a combustion engine or crankcase component as well as combustion engine crankcase and cylinder liner Download PDF

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Publication number
EP2441549B1
EP2441549B1 EP11005427.7A EP11005427A EP2441549B1 EP 2441549 B1 EP2441549 B1 EP 2441549B1 EP 11005427 A EP11005427 A EP 11005427A EP 2441549 B1 EP2441549 B1 EP 2441549B1
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EP
European Patent Office
Prior art keywords
machining
combustion engine
crankcase
corrosion
internal combustion
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EP11005427.7A
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German (de)
French (fr)
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EP2441549A2 (en
EP2441549A3 (en
Inventor
Peter Scharf
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MAN Truck and Bus SE
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MAN Truck and Bus SE
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Publication of EP2441549A3 publication Critical patent/EP2441549A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
    • B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • 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
    • F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
    • 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 headsĀ 
    • 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
    • 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
    • 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
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating

Definitions

  • the invention relates to a method for processing, in particular for mechanical processing, at least one exhaust-carrying surface area of an internal combustion engine or crankcase component, in particular for processing at least one cylinder liner of an internal combustion engine crankcase or for processing at least one cylinder liner of a cylinder liner.
  • the invention also relates to an internal combustion engine crankcase and a cylinder liner.
  • Internal combustion engine crankcases are well known. These serve to support the crankshaft and have cylinders with cylinder liners in which the pistons of the internal combustion engine are guided.
  • the operation of internal combustion engines with a fuel with a high content of sulfur can lead to the formation of aggressive media, for example sulfur oxides and nitrogen oxides, which form aggressive acids such as sulfuric acid with condensed water.
  • This aggressive media or acids cause a corrosive attack in the exhaust-gas-carrying components of an internal combustion engine crankcase made from a material susceptible to corrosion, for example in the area of the cylinder liners of an internal combustion engine crankcase.
  • the conventional cast iron materials or steels can be coated with less corrosive materials, for example with iron-chromium alloys, which, however, increases the cost of the internal combustion engine crankcase or Overall leads cylinder liners.
  • the RU 2 199 609 C1 discloses a method in which a mixture of silicate-containing powder and base oil is introduced into a cylinder to be repaired via a spark plug hole of a cylinder, then the repair is carried out by rotating the drive wheel and brief starter ignitions, and then by operating the vehicle at low speeds.
  • Another object of the present invention is to provide an internal combustion engine crankcase and / or a cylinder liner, whose at least one exhaust-carrying surface area, in particular whose at least one cylinder liner, is reliably protected against corrosion by aggressive media .
  • the at least one exhaust-gas-carrying surface area of the crankcase of the internal combustion engine or crankcase component in particular at least one cylinder liner of a crankcase or a cylinder liner, made from a material susceptible to corrosion, should be used as part of the machining by means of a machining tool that changes the surface quality with a machining tool formed by at least one metal silicate , tribochemically activatable substance is brought into contact, which is activated in the course of the processing depending on a defined contact pressure of the processing tool and / or a defined processing temperature set during processing and forms a corrosion-resistant surface as a tribo-reaction layer with the respective surface area through tribochemical reaction.
  • a corrosion-resistant surface can be formed by a simple tribochemical reaction within the framework of the processing of the exhaust-gas-carrying surface areas that changes the surface properties.
  • this corrosion-resistant surface against aggressive acids, gases and condensates, as they can arise when operating internal combustion engines with exhaust gas recirculation and sulfur-containing fuel, is thus not created afterwards or during operation of the internal combustion engine, but rather integrally with the surface quality beforehand changing processing of the respective component in the course of its manufacture.
  • any machining tool can be used by means of which the formation of a triboreaction layer according to the invention can be achieved, for example also thermally acting machining processes such as laser honing, provided that these do not result in evaporation of the tribochemically activatable substance.
  • the machining tool changing the surface quality is a mechanical machining tool, preferably a cutting and / or cutting machining tool, by means of which the at least one exhaust-gas-carrying surface area, in particular the at least one cylinder liner, is mechanically machined and changed with regard to the surface quality.
  • the terminology of machining and machining should be understood in a broad sense and encompass any mechanical machining in which the machined surface is changed and thus brought into a certain shape, be it through a geometrically determined or a geometrically indeterminate cutting edge .
  • a honing tool by means of which the at least one exhaust-gas-carrying surface area, in particular the cylinder liners, is honed is particularly preferred as a mechanical machining tool, with all honing methods being usable individually or in combination. Honing regularly represents the last processing stage in the manufacture of the internal combustion engine crankcase, in particular for the dimensionally accurate formation of the cylinder bore and thus the cylinder liners of the crankcase. The honing ensures that, for example, the cylinder liners of the crankcase have the desired oil retention capacity, since the honed surfaces have crossed machining grooves.
  • the contact of the tool with the surface to be processed ensures that high reaction energies arise, in particular with regard to a contact pressure and / or a processing temperature, which lead to the activation of the tribochemically activatable substance and thus the corrosion-resistant Can form the surface as a triboreaction layer.
  • the high contact pressures and temperatures that arise in the course of mechanical processing can be used to advantage in order to activate the tribochemically activatable substance in such a way that it forms a corrosion-resistant surface with the respective surface area.
  • the tribochemically activatable substance can be applied directly to the surface to be machined by means of the respective machining tool before and / or during machining, for example applied as a solid layer or sprayed on as a spray layer, the tribochemically activatable substance then being as homogeneous and fine as possible is distributed in the respective mean; alternatively or additionally, however, the tribochemically activatable substance can also be admixed as an additive to a lubricant which is to be supplied in any case during machining, in particular during mechanical machining.
  • lubricant is to be understood here in a comprehensive sense and is expressly intended to include all liquid media that are supplied in the usual way in connection with, in particular, mechanical processing as an emulsion or the like.
  • the addition of the tribochemically activatable substance as an additive to such a lubricant is particularly easy to accomplish and ensures in a simple manner that the tribochemically activatable substance arrives exactly where the tribochemical reaction to form the corrosion-resistant surface is to take place.
  • the additive is preferably dissolved or emulsified in a concentrate in a defined amount, which concentrate is then added to the lubricant in a concentration of 7 to 15%, preferably about 10%, based on the amount of lubricant, in particular is emulsified there.
  • the components of an internal combustion engine that form the exhaust-gas-carrying surface areas can be made from an inexpensive iron material, for example from a corrosion-prone cast iron and / or a corrosion-prone steel.
  • a cylinder 1 of a crankcase (not shown here) of an internal combustion engine is shown schematically and by way of example, in the cylinder bore of which a honing tool 2, also shown here extremely schematically, is inserted in order to carry out fine machining of the cylinder liner 3 in a manner known per se.
  • the honing tool 2 has a plurality of honing stones 5 carrying honing stones 4 distributed over the circumference, which honing stones 5 are spaced apart from one another in the circumferential direction.
  • the honing tool 2 is of conventional design.
  • the honing tool 2 executes a rotary movement according to the arrow 6 with feed in the direction of the arrow 7 in order to produce a cylinder liner 3 with the desired honing grooves (not shown).
  • a lubricant 9 is applied into the cylinder bore and thus onto the cylinder liner 3 by means of a lubricant nozzle 8, shown here only extremely schematically, which is shown in FIG Figure 1 is only shown extremely schematically and by way of example.
  • the lubricant 9 supplied here is drawn off from a lubricant reservoir 10, which is also shown only extremely schematically in the single figure.
  • the lubricant 9 is composed of a base lubricant emulsion 12 in which a metal silicate is emulsified or finely distributed as a tribochemically activatable additive 11, so that the cylinder liner 3 is wetted with the tribochemically activatable additive as part of the mechanical fine machining by means of the honing tool 2 .
  • crankcase itself and thus the cylinder liners 3 are preferably made from a cast iron material, for example, before they are machined.

Description

Verfahren zur Bearbeitung eines abgasfĆ¼hrenden OberflƤchenbereichs eines Brennkraftmaschinen- oder KurbelgehƤusebestandteilsMethod for machining an exhaust-gas-carrying surface area of an internal combustion engine or crankcase component

Die Erfindung betrifft ein Verfahren zur Bearbeitung, insbesondere zur mechanischen Bearbeitung, wenigstens eines abgasfĆ¼hrenden OberflƤchenbereichs eines Brennkraftmaschinen- oder KurbelgehƤusebestandteils, insbesondere zur Bearbeitung wenigstens einer Zylinderlaufbahn eines Brennkraftmaschinen-KurbelgehƤuses oder zur Bearbeitung wenigstens einer Zylinderlaufbahn einer Zylinderlaufbuchse. Ferner betrifft die Erfindung ein Brennkraftmaschinen-KurbelgehƤuse sowie eine Zylinderlaufbuchse.The invention relates to a method for processing, in particular for mechanical processing, at least one exhaust-carrying surface area of an internal combustion engine or crankcase component, in particular for processing at least one cylinder liner of an internal combustion engine crankcase or for processing at least one cylinder liner of a cylinder liner. The invention also relates to an internal combustion engine crankcase and a cylinder liner.

KurbelgehƤuse von Brennkraftmaschinen sind allgemein bekannt. Diese dienen zur Lagerung der Kurbelwelle und weisen Zylinder mit Zylinderlaufbahnen auf, in denen die Kolben der Verbrennungsmaschinen gefĆ¼hrt werden. In Verbindung mit einer AbgasrĆ¼ckfĆ¼hrung kann es beim Betrieb von Brennkraftmaschinen mit einem stark schwefelhaltigen Kraftstoff zur Bildung von aggressiven Medien kommen, zum Beispiel zur Bildung von Schwefeloxiden und Stickoxiden, die mit kondensiertem Wasser aggressive SƤuren, wie zum Beispiel SchwefelsƤure bilden. Diese aggressiven Medien bzw. SƤuren verursachen in den abgasfĆ¼hrenden Bauteilen eines aus einem korrosionsanfƤlligen Werkstoff hergestellten Brennkraftmaschinen-KurbelgehƤuses, zum Beispiel im Bereich von Zylinderlaufbahnen eines Brennkraftmaschinen-KurbelgehƤuses, einen korrosiven Angriff. Damit kommt es zu einer Zerstƶrung der OberflƤchenbereiche der Zylinderlaufbahnen und schlieƟlich zu einer BeschƤdigung bzw. Zerstƶrung derselben, was sich bekanntlich nachteilig auf den Brennkraftmaschinenbetrieb insgesamt auswirkt. Das Gleiche gilt vom Prinzip her fĆ¼r solche Zylinderlaufbahnen, die durch in das KurbelgehƤuse eingesetzte bzw. eingegossene Zylinderlaufbuchsen, auch Zylinderliner genannt, gebildet werden.Internal combustion engine crankcases are well known. These serve to support the crankshaft and have cylinders with cylinder liners in which the pistons of the internal combustion engine are guided. In connection with exhaust gas recirculation, the operation of internal combustion engines with a fuel with a high content of sulfur can lead to the formation of aggressive media, for example sulfur oxides and nitrogen oxides, which form aggressive acids such as sulfuric acid with condensed water. This aggressive media or acids cause a corrosive attack in the exhaust-gas-carrying components of an internal combustion engine crankcase made from a material susceptible to corrosion, for example in the area of the cylinder liners of an internal combustion engine crankcase. This leads to destruction of the surface areas of the cylinder liners and ultimately to damage or destruction of the same, which is known to have a disadvantageous effect on the operation of the internal combustion engine as a whole. In principle, the same applies to those cylinder liners that are formed by cylinder liners, also called cylinder liners, which are inserted or cast into the crankcase.

Des Weiteren ist es allgemein bekannt, zum Beispiel aus der DE 10 2007 017 977 A1 , die Zylinderlaufbahnen eines Brennkraftmaschinen-KurbelgehƤuses durch Honen mechanisch fein zu bearbeiten, um zwischen dem Kolben und der Zylinderlaufbahn gute Gleiteigenschaften einzustellen. Derartige aufwendig fein bearbeitete OberflƤchen werden jedoch durch den zuvor beschriebenen SƤureangriff beim Betrieb der Brennkraftmaschine mit schwefelhaltigen Kraftstoff zerstƶrt und fĆ¼hren schnell zu einer Nacharbeitnotwendigkeit der Zylinderlaufbahnen, was ersichtlich teuer und aufwendig ist.It is also generally known, for example from the DE 10 2007 017 977 A1 to mechanically fine-machine the cylinder liners of an internal combustion engine crankcase by honing in order to set good sliding properties between the piston and the cylinder liner. Such elaborately finely machined surfaces are destroyed by the acid attack described above when the internal combustion engine is operated with sulfur-containing fuel and quickly lead to the need for reworking of the cylinder liners, which is obviously expensive and time-consuming.

Um einen derartigen Korrosionsangriff durch aggressive SƤuren, Gase und Kondensate zu begegnen, kƶnnen zum Beispiel die herkƶmmlichen Eisengusswerkstoffe bzw. StƤhle mit weniger korrosivanfƤlligen Werkstoffen beschichtet werden, zum Beispiel mit Eisen-Chrom-Legierungen, was jedoch zu einer deutlichen Verteuerung der Brennkraftmaschinen-KurbelgehƤuse oder Zylinderlaufbuchsen insgesamt fĆ¼hrt.In order to counteract such a corrosive attack by aggressive acids, gases and condensates, for example the conventional cast iron materials or steels can be coated with less corrosive materials, for example with iron-chromium alloys, which, however, increases the cost of the internal combustion engine crankcase or Overall leads cylinder liners.

Aus der DE 10 2006 017 990 A1 , auf welcher die Erfindung basiert, ist ebenso wie aus der WO 2009/071674 A2 ein Verfahren zur Bearbeitung von ZylinderlaufflƤchen bekannt, bei dem eine Tribomutationsschicht zur Reduzierung der Reibwerte und Verbesserung der VerschleiƟbestƤndigkeit ausgebildet wird.From the DE 10 2006 017 990 A1 on which the invention is based is as well as from WO 2009/071674 A2 a method for machining cylinder sliding surfaces is known in which a Tribomutation layer is formed to reduce the coefficient of friction and improve wear resistance.

Die RU 2 199 609 C1 offenbart ein Verfahren, bei dem eine Mischung aus silikathaltigem Pulver und Grundƶl Ć¼ber ein ZĆ¼ndkerzenloch eines Zylinders in einen zu reparierenden Zylinder eingebracht wird, anschlieƟend durch DrehbetƤtigung des Antriebsrades und kurze StarterzĆ¼ndungen sowie weiter anschlieƟend einem Fahrzeugbetrieb bei geringen Umdrehungszahlen die Reparatur durchgefĆ¼hrt wird.the RU 2 199 609 C1 discloses a method in which a mixture of silicate-containing powder and base oil is introduced into a cylinder to be repaired via a spark plug hole of a cylinder, then the repair is carried out by rotating the drive wheel and brief starter ignitions, and then by operating the vehicle at low speeds.

Es ist daher Aufgabe der vorliegenden Erfindung, ein Verfahren zur Bearbeitung, insbesondere zur mechanischen Bearbeitung, wenigstens eines abgasfĆ¼hrenden OberflƤchenbereichs eines Brennkraftmaschinen- oder KurbelgehƤusebestandteils, insbesondere zur Bearbeitung wenigstens einer Zylinderlaufbahn eines Brennkraftmaschinen-KurbelgehƤuses oder zur Bearbeitung wenigstens einer Zylinderlaufbahn einer Zylinderlaufbuchse, zu schaffen, mittels dem der wenigstens eine abgasfĆ¼hrende OberflƤchenbereich auf einfache und funktionssichere Weise zuverlƤssig gegen Korrosion, insbesondere zuverlƤssig gegen innermotorische Korrosion, geschĆ¼tzt werden kann. Eine weitere Aufgabe der vorliegenden Erfindung wird darin gesehen, ein Brennkraftmaschinen-KurbelgehƤuse und/oder eine Zylinderlaufbuchse zur VerfĆ¼gung zu stellen, dessen bzw. deren wenigstens einer abgasfĆ¼hrender OberflƤchenbereich, insbesondere dessen bzw. deren wenigstens eine Zylinderlaufbahn, zuverlƤssig gegen Korrosion durch aggressive Medien geschĆ¼tzt ist.It is therefore the object of the present invention to provide a method for machining, in particular for mechanical machining, at least one exhaust-gas-carrying surface area of an internal combustion engine or crankcase component, in particular for machining at least one cylinder liner of an internal combustion engine crankcase or for machining at least one cylinder liner of a cylinder liner, by means of which the at least one exhaust-gas-carrying surface area can be reliably protected against corrosion, in particular reliably against internal engine corrosion, in a simple and functionally reliable manner. Another object of the present invention is to provide an internal combustion engine crankcase and / or a cylinder liner, whose at least one exhaust-carrying surface area, in particular whose at least one cylinder liner, is reliably protected against corrosion by aggressive media .

Diese Aufgabe wird bezĆ¼glich des Verfahrens gelƶst mit den Merkmalen des Anspruchs 1. BezĆ¼glich des Brennkraftmaschinen-KurbelgehƤuses wird diese Aufgabe gelƶst mit den Merkmalen des Anspruchs 7. BezĆ¼glich der Zylinderlaufbuchse wird diese Aufgabe gelƶst mit den Merkmalen des Anspruchs 8. Vorteilhafte Ausgestaltungen sind in den UnteransprĆ¼chen angegeben.This object is achieved with regard to the method with the features of claim 1. With regard to the internal combustion engine crankcase, this object is achieved with the features of claim 7. With regard to the cylinder liner, this object is achieved with the features of Claim 8. Advantageous embodiments are given in the subclaims.

ErfindungsgemƤƟ wird vorgeschlagen, dass der wenigstens eine aus einem korrosionsanfƤlligen Werkstoff hergestellte abgasfĆ¼hrende OberflƤchenbereich des KurbelgehƤuses des Brennkraftmaschinen- oder KurbelgehƤusebestandteils, insbesondere wenigstens eine Zylinderlaufbahn eines KurbelgehƤuses oder einer Zylinderlaufbuchse, im Rahmen der Bearbeitung mittels eines die OberflƤchenbeschaffenheit verƤndernden Bearbeitungswerkzeuges mit einem durch wenigstens ein Metallsilikat gebildeten, tribochemisch aktivierbaren Stoff in Kontakt gebracht wird, der im Verlauf der Bearbeitung in AbhƤngigkeit von einem definierten Anpressdruck des Bearbeitungswerkzeuges und/oder einer sich wƤhrend der Bearbeitung einstellenden definierten Bearbeitungstemperatur aktiviert wird und mit dem jeweiligen OberflƤchenbereich durch tribochemische Reaktion eine korrosionsbestƤndige OberflƤche als Triboreaktionsschicht ausbildet.According to the invention it is proposed that the at least one exhaust-gas-carrying surface area of the crankcase of the internal combustion engine or crankcase component, in particular at least one cylinder liner of a crankcase or a cylinder liner, made from a material susceptible to corrosion, should be used as part of the machining by means of a machining tool that changes the surface quality with a machining tool formed by at least one metal silicate , tribochemically activatable substance is brought into contact, which is activated in the course of the processing depending on a defined contact pressure of the processing tool and / or a defined processing temperature set during processing and forms a corrosion-resistant surface as a tribo-reaction layer with the respective surface area through tribochemical reaction.

Damit kƶnnen aufwendige Beschichtungsverfahren im Nachgang zur Herstellung des jeweiligen Bauteils vorteilhaft vermieden werden, ebenso wie der Einsatz von teuren, korrosionsbestƤndigen Werkstoffen vermieden werden kann. Vielmehr kann mit der vorliegenden Erfindung im Rahmen der ohnehin stattfindenden, die OberflƤchenbeschaffenheit verƤndernden Bearbeitung der abgasfĆ¼hrenden OberflƤchenbereiche durch eine einfache tribochemische Reaktion eine korrosionsbestƤndige OberflƤche ausgebildet werden.In this way, complex coating processes after the production of the respective component can advantageously be avoided, just as the use of expensive, corrosion-resistant materials can be avoided. Rather, with the present invention, a corrosion-resistant surface can be formed by a simple tribochemical reaction within the framework of the processing of the exhaust-gas-carrying surface areas that changes the surface properties.

ErfindungsgemƤƟ wird diese korrosionsbestƤndige OberflƤche gegen aggressive SƤuren, Gase und Kondensate, wie sie beim Betrieb von Brennkraftmaschinen mit AbgasrĆ¼ckfĆ¼hrung und schwefelhaltigem Kraftstoff entstehen kƶnnen, somit nicht erst nachtrƤglich bzw. im Betrieb der Brennkraftmaschine erzeugt, sondern bereits vorher integral mit der die OberflƤchenbeschaffenheit Ƥndernden Bearbeitung des jeweiligen Bauteils im Rahmen dessen Herstellung.According to the invention, this corrosion-resistant surface against aggressive acids, gases and condensates, as they can arise when operating internal combustion engines with exhaust gas recirculation and sulfur-containing fuel, is thus not created afterwards or during operation of the internal combustion engine, but rather integrally with the surface quality beforehand changing processing of the respective component in the course of its manufacture.

GrundsƤtzlich kann jedes Bearbeitungswerkzeug verwendet werden, mittels dem die erfindungsgemƤƟe Ausbildung einer Triboreaktionsschicht erzielt werden kann, zum Beispiel auch thermisch wirkende Bearbeitungsverfahren wie zum Beispiel das Laserhonen, sofern diese keine Verdampfung des tribochemisch aktivierbaren Stoffes zur Folge haben. Vorzugsweise ist das die OberflƤchenbeschaffenheit verƤndernde Bearbeitungswerkzeug jedoch ein mechanisches Bearbeitungswerkzeug, bevorzugt ein spanabhebendes und/oder spanendes Bearbeitungswerkzeug, mittels dem der wenigstens eine abgasfĆ¼hrende OberflƤchenbereich, insbesondere die wenigstens eine Zylinderlaufbahn, mechanisch bearbeitet und hinsichtlich der OberflƤchenbeschaffenheit verƤndert wird. Die Begrifflichkeit einer spanabhebenden und einer spanenden Bearbeitung soll dabei ausdrĆ¼cklich in einem weiten Sinne verstanden werden und jedwede mechanische Bearbeitung umfassen, bei der die bearbeitete OberflƤche verƤndert und damit in eine bestimmte Form gebracht wird, sei es durch eine geometrisch bestimmte oder durch eine geometrisch unbestimmte Schneide.In principle, any machining tool can be used by means of which the formation of a triboreaction layer according to the invention can be achieved, for example also thermally acting machining processes such as laser honing, provided that these do not result in evaporation of the tribochemically activatable substance. Preferably, however, the machining tool changing the surface quality is a mechanical machining tool, preferably a cutting and / or cutting machining tool, by means of which the at least one exhaust-gas-carrying surface area, in particular the at least one cylinder liner, is mechanically machined and changed with regard to the surface quality. The terminology of machining and machining should be understood in a broad sense and encompass any mechanical machining in which the machined surface is changed and thus brought into a certain shape, be it through a geometrically determined or a geometrically indeterminate cutting edge .

Besonders bevorzugt ist als mechanisches Bearbeitungswerkzeug ein Honwerkzeug, mittels dem der wenigstens eine abgasfĆ¼hrende OberflƤchenbereich, insbesondere die Zylinderlaufbahnen, gehont wird, wobei sƤmtliche Honverfahren einzeln oder in Kombination einsetzbar sind. Das Honen stellt regelmƤƟig die letzte Bearbeitungsstufe bei der Herstellung des Brennkraftmaschinen-KurbelgehƤuses dar, insbesondere zur maƟgenauen Ausbildung der Zylinderbohrung und damit der Zylinderlaufbahnen des KurbelgehƤuses. Durch das Honen wird sichergestellt, dass zum Beispiel die Zylinderlaufbahnen des KurbelgehƤuses das gewĆ¼nschte Ɩlhaltevermƶgen aufweisen, da die gehonten FlƤchen gekreuzte Bearbeitungsriefen aufweisen.A honing tool by means of which the at least one exhaust-gas-carrying surface area, in particular the cylinder liners, is honed is particularly preferred as a mechanical machining tool, with all honing methods being usable individually or in combination. Honing regularly represents the last processing stage in the manufacture of the internal combustion engine crankcase, in particular for the dimensionally accurate formation of the cylinder bore and thus the cylinder liners of the crankcase. The honing ensures that, for example, the cylinder liners of the crankcase have the desired oil retention capacity, since the honed surfaces have crossed machining grooves.

Des Weiteren wird im Rahmen einer mechanischen Bearbeitung durch den Kontakt des Werkzeugs mit der zu bearbeitenden OberflƤche sichergestellt, dass hohe Reaktionsenergien, insbesondere im Hinblick auf einen Anpressdruck und/oder eine Bearbeitungstemperatur, entstehen, die zur Aktivierung des tribochemisch aktivierbaren Stoffes fĆ¼hren und somit die korrosionsbestƤndige OberflƤche als Triboreaktionsschicht ausbilden kƶnnen. Damit kƶnnen somit die im Rahmen der mechanischen Bearbeitung ohnehin entstehenden hohen AnpressdrĆ¼cke und Temperaturen vorteilhaft ausgenutzt werden, um den tribochemisch aktivierbaren Stoff so zu aktivieren, dass dieser mit dem jeweiligen OberflƤchenbereich eine korrosionsbestƤndige OberflƤche ausbildet.Furthermore, in the course of mechanical processing, the contact of the tool with the surface to be processed ensures that high reaction energies arise, in particular with regard to a contact pressure and / or a processing temperature, which lead to the activation of the tribochemically activatable substance and thus the corrosion-resistant Can form the surface as a triboreaction layer. In this way, the high contact pressures and temperatures that arise in the course of mechanical processing can be used to advantage in order to activate the tribochemically activatable substance in such a way that it forms a corrosion-resistant surface with the respective surface area.

Der tribochemisch aktivierbare Stoff kann dabei zum einen vor und/oder wƤhrend der Bearbeitung mittels des jeweiligen Bearbeitungswerkzeuges direkt auf die zu bearbeitende OberflƤche aufgebracht werden, zum Beispiel als feste Schicht aufgebracht oder als SprĆ¼hschicht aufgesprĆ¼ht werden, wobei der tribochemisch aktivierbare Stoff dann mƶglichst homogen und fein im jeweiligen Mittel verteilt ist; alternativ oder zusƤtzlich kann der tribochemisch aktivierbare Stoff aber auch als Additiv einem bei der Bearbeitung, insbesondere bei der mechanischen Bearbeitung ohnehin zuzufĆ¼hrenden Schmiermittel beigemischt sein. Die Begrifflichkeit Schmiermittel ist hier in einem umfassenden Sinne zu verstehen und soll ausdrĆ¼cklich sƤmtliche flĆ¼ssigen Medien umfassen, die in Verbindung mit der insbesondere mechanischen Bearbeitung als Emulsion oder dergleichen in Ć¼blicher Weise zugefĆ¼hrt werden. Insbesondere die Zugabe des tribochemisch aktivierbaren Stoffes als Additiv zu einem derartigen Schmiermittel ist besonders einfach zu bewerkstelligen und stellt auf einfache Weise sicher, dass der tribochemisch aktivierbare Stoff genau dort hinkommt, wo die tribochemische Reaktion zur Ausbildung der korrosionsbestƤndigen OberflƤche stattfinden soll.The tribochemically activatable substance can be applied directly to the surface to be machined by means of the respective machining tool before and / or during machining, for example applied as a solid layer or sprayed on as a spray layer, the tribochemically activatable substance then being as homogeneous and fine as possible is distributed in the respective mean; alternatively or additionally, however, the tribochemically activatable substance can also be admixed as an additive to a lubricant which is to be supplied in any case during machining, in particular during mechanical machining. The term lubricant is to be understood here in a comprehensive sense and is expressly intended to include all liquid media that are supplied in the usual way in connection with, in particular, mechanical processing as an emulsion or the like. In particular, the addition of the tribochemically activatable substance as an additive to such a lubricant is particularly easy to accomplish and ensures in a simple manner that the tribochemically activatable substance arrives exactly where the tribochemical reaction to form the corrosion-resistant surface is to take place.

Das Additiv wird bevorzugt in einem Konzentrat in definierter Menge gelƶst bzw. emulgiert, welches Konzentrat dann dem Schmiermittel in einer Konzentration von 7 bis 15%, bevorzugt in etwa 10%, bezogen auf die Schmiermittelmenge zugegeben wird, insbesondere dort emulgiert wird.The additive is preferably dissolved or emulsified in a concentrate in a defined amount, which concentrate is then added to the lubricant in a concentration of 7 to 15%, preferably about 10%, based on the amount of lubricant, in particular is emulsified there.

Wie bereits zuvor dargestellt, kƶnnen aufgrund der erfindungsgemƤƟen VerfahrensfĆ¼hrung die die abgasfĆ¼hrenden OberflƤchenbereiche ausbildenden Bauteile einer Brennkraftmaschine, wie zum Beispiel ein KurbelgehƤuse und/oder eine Zylinderlaufbuchse, aus einem kostengĆ¼nstigen Eisenwerkstoff hergestellt sein, zum Beispiel aus einem korrosionsanfƤlligen Gusseisen und/oder einem korrosionsanfƤlligen Stahl.As already shown above, due to the method management according to the invention, the components of an internal combustion engine that form the exhaust-gas-carrying surface areas, such as a crankcase and / or a cylinder liner, can be made from an inexpensive iron material, for example from a corrosion-prone cast iron and / or a corrosion-prone steel.

Die sich in Verbindung mit einem Brennkraftmaschinen-KurbelgehƤuse mit abgasfĆ¼hrenden OberflƤchenbereichen, insbesondere mit Zylinderlaufbahnen, bzw. mit einer Zylinderlaufbuchse ergebenden Vorteile sind die Gleichen, wie sie zuvor mit der erfindungsgemƤƟen VerfahrensfĆ¼hrung beschrieben worden sind. Insofern wird hier auf die zuvor gemachten AusfĆ¼hrungen verwiesen.The advantages that result in connection with an internal combustion engine crankcase with exhaust-gas-carrying surface areas, in particular with cylinder liners or with a cylinder liner, are the same as those previously described with the method according to the invention. In this respect, reference is made here to the statements made above.

In der einzigen Figur ist schematisch und beispielhaft ein Zylinder 1 eines hier nicht weiter dargestellten KurbelgehƤuses einer Brennkraftmaschine gezeigt, in dessen Zylinderbohrung eine hier ebenfalls ƤuƟerst schematisch dargestellte Honahle 2 eingefĆ¼hrt ist, um eine Feinbearbeitung der Zylinderlaufbahn 3 in an sich bekannter Weise durchzufĆ¼hren. Die Honahle 2 weist hierzu Ć¼ber den Umfang verteilt mehrere Honsteine 4 tragende Honleisten 5 auf, die in Umfangsrichtung voneinander beabstandet sind. Insofern ist die Honahle 2 herkƶmmlicher Bauart. Die Honahle 2 fĆ¼hrt zur mechanischen Feinbearbeitung der Zylinderlaufbahn 3 eine Drehbewegung entsprechend dem Pfeil 6 mit Vorschub in Richtung des Pfeils 7 aus, um eine Zylinderlaufbahn 3 mit den gewĆ¼nschten Honriefen (nicht dargestellt) herzustellen.In the single figure, a cylinder 1 of a crankcase (not shown here) of an internal combustion engine is shown schematically and by way of example, in the cylinder bore of which a honing tool 2, also shown here extremely schematically, is inserted in order to carry out fine machining of the cylinder liner 3 in a manner known per se. For this purpose, the honing tool 2 has a plurality of honing stones 5 carrying honing stones 4 distributed over the circumference, which honing stones 5 are spaced apart from one another in the circumferential direction. In this respect, the honing tool 2 is of conventional design. For mechanical fine machining of the cylinder liner 3, the honing tool 2 executes a rotary movement according to the arrow 6 with feed in the direction of the arrow 7 in order to produce a cylinder liner 3 with the desired honing grooves (not shown).

Im Rahmen dieser mechanischen Hon-Feinbearbeitung mittels der Honahle 2 wird mittels einer hier lediglich ƤuƟerst schematisch dargestellten SchmiermitteldĆ¼se 8 ein Schmiermittel 9 in die Zylinderbohrung und damit auf die Zylinderlaufbahn 3 aufgebracht, was in der Figur 1 lediglich ƤuƟerst schematisch und beispielhaft dargestellt ist. Das hier zugefĆ¼hrte Schmiermittel 9 wird von einem Schmiermittelreservoir 10 abgezogen, das in der einzigen Figur ebenfalls lediglich ƤuƟerst schematisch dargestellt ist. Das Schmiermittel 9 setzt sich dabei zusammen aus einer Basis-Schmiermittelemulsion 12, in dem ein Metallsilikat als tribochemisch aktivierbares Additiv 11 emulgiert bzw. feinstverteilt ist, so dass die Zylinderlaufbahn 3 im Rahmen der mechanischen Feinbearbeitung mittels der Honahle 2 mit dem tribochemisch aktivierbaren Additiv benetzt ist. Diese wird im weiteren Verlauf der mechanischen Honbearbeitung aufgrund des im jeweiligen Honbereich vorherrschenden hohen Anpressdrucks der Honahle 2 und der im Honbereich vorherrschenden relativ hohen Bearbeitungstemperatur aktiviert und bildet so mit dem mechanisch fein bearbeiteten OberflƤchenbereich der Zylinderlaufbahn 3 eine hier lediglich ƤuƟerst beispielhaft und schematisch eingezeichnete korrosionsbestƤndige OberflƤche 13 als Triboreaktionsschicht aus. Diese bildet einen hervorragenden innermotorischen Korrosionsschutz gegen aggressive SƤuren, Gase, Kondensate und dergleichen, wie sie insbesondere beim Betrieb von Brennkraftmaschinen mit AbgasrĆ¼ckfĆ¼hrung und schwefelhaltigem Kraftstoff entstehen kƶnnen.In the context of this mechanical honing by means of the honing tool 2, a lubricant 9 is applied into the cylinder bore and thus onto the cylinder liner 3 by means of a lubricant nozzle 8, shown here only extremely schematically, which is shown in FIG Figure 1 is only shown extremely schematically and by way of example. The lubricant 9 supplied here is drawn off from a lubricant reservoir 10, which is also shown only extremely schematically in the single figure. The lubricant 9 is composed of a base lubricant emulsion 12 in which a metal silicate is emulsified or finely distributed as a tribochemically activatable additive 11, so that the cylinder liner 3 is wetted with the tribochemically activatable additive as part of the mechanical fine machining by means of the honing tool 2 . This is activated in the further course of the mechanical honing process due to the high contact pressure of the honing tool 2 prevailing in the respective honing area and the relatively high processing temperature prevailing in the honing area and thus forms a corrosion-resistant surface with the mechanically finely machined surface area of the cylinder liner 3, which is shown here only as an extremely exemplary and schematically illustrated surface 13 as a triboreaction layer. This forms an excellent internal engine corrosion protection against aggressive acids, gases, condensates and the like, as they can arise in particular when operating internal combustion engines with exhaust gas recirculation and sulfur-containing fuel.

Das KurbelgehƤuse selbst und damit die Zylinderlaufbahnen 3 sind vor deren Bearbeitung bevorzugt aus einem zum Beispiel Eisengusswerkstoff hergestellt.The crankcase itself and thus the cylinder liners 3 are preferably made from a cast iron material, for example, before they are machined.

BezugszeichenlisteList of reference symbols

11
Zylindercylinder
22
HonahleHonahle
33
ZylinderlaufbahnCylinder liner
44th
HonsteineHoning stones
55
HonleistenHoning stones
66th
Pfeilarrow
77th
Pfeilarrow
88th
SchmiermitteldĆ¼seLubricant nozzle
99
Schmiermittellubricant
1010
SchmiermittelreservoirLubricant reservoir
1111
tribochemisch aktivierbares Additivtribochemically activatable additive
1212th
Basis-SchmiermittelemulsionBasic lubricant emulsion
1313th
korrosionsbestƤndige OberflƤchecorrosion-resistant surface

Claims (8)

  1. Method for the machining of at least one exhaust-gas-conducting surface region of an internal combustion engine or crankcase part in order to provide a corrosion-resistant surface layer, by means of a surface-condition-changing machining tool, wherein the at least one exhaust-gas-conducting surface region, which is produced from a corrodible material is brought into contact, during the course of the machining by means of the surface-condition-changing machining tool, with a tribochemically activatable substance formed by at least one metal silicate, which substance is activated during the course of the machining as a function of a defined contact pressure of the machining tool and/or as a function of a defined machining temperature generated during the machining, and which forms with the respective surface region, by tribochemical reaction, the corrosion-resistant surface as a triboreaction layer.
  2. Method according to Claim 1, characterized in that the surface-condition-changing machining tool is a mechanical machining tool, preferably a chip-removing and/or chip-forming machining tool, most preferably a honing tool, by means of which the at least one exhaust-gas-conducting surface region is mechanically machined and changed with regard to the surface condition.
  3. Method according to Claim 1 or Claim 2, characterized in that the tribochemically activatable substance is applied directly to the surface to be mechanically machined before and/or during the machining by means of the machining tool, and/or is added as an additive to a lubricant supplied by the mechanical machining.
  4. Method according to one of the preceding claims, characterized in that the crankcase is produced from an iron material, in particular from a corrodible cast iron and/or from the corrodible steel.
  5. Method according to one of the preceding claims, characterized in that the triboreaction layer is produced in the final machining step before the finishing of the part.
  6. Method according to one of the preceding claims, characterized in that a least one cylinder barrel of an internal combustion engine crankcase or at least one cylinder barrel of a cylinder sleeve is machined.
  7. Internal combustion engine crankcase having at least one exhaust-gas-conducting surface region, which surface region has a corrosion-resistant surface formed by means of a method according to one of Claims 1 to 6.
  8. Cylinder sleeve having at least one cylinder barrel which has a corrosion-resistant surface formed by means of a method according to one of method Claims 1 to 6.
EP11005427.7A 2010-10-14 2011-07-02 Method for mechanical processing a waste gas conveying surface area of a combustion engine or crankcase component as well as combustion engine crankcase and cylinder liner Active EP2441549B1 (en)

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US8839514B2 (en) 2014-09-23
RU2483855C1 (en) 2013-06-10
BRPI1107069A2 (en) 2015-11-10
EP2441549A2 (en) 2012-04-18
CN102554755B (en) 2016-07-06
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CN102554755A (en) 2012-07-11
RU2011141569A (en) 2013-04-20

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