EP2320064B1 - Procédé de traitement d'une buse d'injection - Google Patents

Procédé de traitement d'une buse d'injection Download PDF

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Publication number
EP2320064B1
EP2320064B1 EP10174323A EP10174323A EP2320064B1 EP 2320064 B1 EP2320064 B1 EP 2320064B1 EP 10174323 A EP10174323 A EP 10174323A EP 10174323 A EP10174323 A EP 10174323A EP 2320064 B1 EP2320064 B1 EP 2320064B1
Authority
EP
European Patent Office
Prior art keywords
injection nozzle
fluid
pressure
injection
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.)
Not-in-force
Application number
EP10174323A
Other languages
German (de)
English (en)
Other versions
EP2320064A1 (fr
Inventor
Stefan Kern
Heiner Dr. Haberland
Wolfgang Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAN Energy Solutions SE
Original Assignee
MAN Diesel and Turbo SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAN Diesel and Turbo SE filed Critical MAN Diesel and Turbo SE
Publication of EP2320064A1 publication Critical patent/EP2320064A1/fr
Application granted granted Critical
Publication of EP2320064B1 publication Critical patent/EP2320064B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • F02M2200/9061—Special treatments for modifying the properties of metals used for fuel injection apparatus, e.g. modifying mechanical or electromagnetic properties

Definitions

  • the invention relates to a method for processing an injection nozzle according to the preamble of claim 1.
  • Injectors of internal combustion engines are highly stressed components. Thus injectors are exposed to high injection pressures depending on the injection cycle.
  • the Dauersehwellfesttechnik injectors limited thereby the feasible injection pressures.
  • the present invention is based on the problem to provide a method for processing an injection nozzle, by means of which the Treasureschwellfestmaschine same can be increased.
  • This problem is solved by a method according to claim 1.
  • the fuel-serving recesses of the injection nozzle are filled with a rheopexic or dilatant fluid, wherein the fluid is acted upon by an autofrettaged pressure, so that in the recesses of the injection such an internal pressure builds up that the Treasureschweilfestmaschine the injector is increased.
  • Autofrettage is a process for increasing the strength of, for example, pipelines for use with high and pulsating internal pressures.
  • the tube is exposed to a pressure higher than the subsequent operating pressure and above the yield strength, so that the areas on the inner wall plasticize. After relaxing, compressive residual stresses develop in this area, which prevent cracking during later use.
  • the problem here is that, for example, the injection holes of the injectors can not be compressed with it.
  • the present invention proposes for the first time, to increase the Treasureschwellfesttechnik of injectors recesses of the injectors with a fluid having rheopexic or dilatant properties, wherein the fluid is subjected to the rheopexic or dilatant properties with an autofrettaged pressure, so that in the recesses the injector builds up an internal pressure with which the Treasureschwellfestmaschine the injector can be increased.
  • Rheopexy is the property of a non-Newtonian fluid to exhibit higher viscosity after shear.
  • Rheopexy is highly time-dependent and means that the viscosity increases with time with constant shear. This behavior is closely related to the dilatancy, where the viscosity is higher only during shear. Dilatancy, in contrast to rheopexy, is characterized by the fact that it is not time-dependent, but depends only on shear. The larger the applied shear, the more viscous or tougher the fluid behaves.
  • the fluid to be used here for example, consists of two components, namely an oily base fluid (Autofrettageöl) mixed with a medium having a granular structure such as quartz sand or the like.
  • an oily base fluid Autofrettageöl
  • a medium having a granular structure such as quartz sand or the like.
  • Fig. 1 shows a cross section through an injection nozzle 1, wherein the injection nozzle 1 is provided by an injection nozzle body 2, in which recesses are introduced, namely a Kraftlosoffaufauf 3, a blind hole area 4 and injection holes 5, wherein in the transition region between the fuel inlet 3 and the blind hole area 4, a so-called needle seat 6 is formed.
  • the autofrettage pressure is dimensioned in such a way that in the material of the injection nozzle, namely in the material of the injection nozzle body 2, stresses above the yield strength of the material and below the tensile strength of the same form.
  • the Autofrettagetik is further dimensioned such that the injection nozzle in the region of the recesses 3 to 6, which serve the fuel guide, at least partially plastically deformed and thus partially plasticized, so remain after the degradation of Autofrettagetiks in the plastically deformed or plasticized sections compressive stresses, These compressive residual stresses cause swelling operating load due to pressure, a reduction of the mean voltage and thus an increase in the Treasureschwellfestmaschine the injector. 1
  • the invention is therefore based on the finding that by utilizing a fluid having rheopatic or dilatant properties, the fatigue strength of an injection nozzle 1 can be increased.
  • Fluids with rheopatic or dilatant properties have an increased viscosity with increasing shear of the fluid particles, whereby in rheopexic fluids, this increase in viscosity is dependent on the duration of the shear.
  • narrowest flow cross-sections are located in the area of the injection holes 5, so that the greatest increase in viscosity of the rheopatic or dilatant fluid upon application the Autofrettag horrs in the spray holes 5 is to be expected.
  • dilatant or rheo-optic fluids contain granular constituents which, when a sufficient shear is applied, block each other and thus cause the viscosity to increase. With the appropriate hardness of the grains, these granular constituents can have an abrasive effect in the flow around steel components.
  • a fluid can additionally be used for the method of hydroerosive rounding (HE rounding) of spray holes of the injection nozzles. Both methods (HE rounding and Autofrettage the injection nozzles) can thus be combined in one operation. The methods are to be designed so that the fluid first flows through the injection nozzle at low pressure and the spray hole inlets are processed erosively.
  • the dilatant or rheopex properties do not occur at the correspondingly low shear in the spray holes. Afterwards, the pressure at which the fluid is pumped through the nozzle is increased, so that the dilatant or rheopexic behavior of the fluid occurs and the flow through the injection holes comes to a standstill. The pressure is then to increase further to the autofrettage pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Procédé de traitement d'un injecteur,
    caractérisé en ce qu'
    on remplit les cavités de l'injecteur servant à guider le carburant avec un fluide rhéopexique ou un fluide dilatant, et
    on sollicite le fluide avec une pression d'auto-frettage de façon à établir une pression intérieure dans les cavités de l'injecteur pour augmenter la résistance permanente aux efforts pulsatoires de l'injecteur.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on dimensionne la pression d'auto-frettage pour développer dans le matériau de l'injecteur des tensions supérieures à la limite d'allongement du matériau et inférieures à la résistance à la traction du matériau.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce qu'
    on dimensionne la pression d'auto-frettage pour déformer plastiquement au moins par segments l'injecteur dans la zone des cavités servant au passage du carburant, et
    après suppression de la pression d'auto-frettage, des contraintes de tension propres subsistent dans les segments déformés plastiquement.
  4. Application du procédé selon l'une des revendications 1 à 3 pour traiter un injecteur pour un moteur à combustion diesel marin fonctionnant avec de l'huile lourde.
  5. Application du procédé selon la revendication 4,
    caractérisé en ce que
    le fluide rhéopexique ou dilatant pour augmenter la résistance permanente aux efforts pulsatoires de l'injecteur est utilisé en plus, également utilisé pour arrondir par hydro-érosion les orifices d'injection de l'injecteur en ce que le fluide est tout d'abord pompé avec une faible pression à travers l'injecteur et après l'usinage par érosion des orifices d'injection, on augmente la pression pour le passage du fluide jusqu'à atteindre la pression d'auto-frettage.
EP10174323A 2009-11-05 2010-08-27 Procédé de traitement d'une buse d'injection Not-in-force EP2320064B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009046437.9A DE102009046437B4 (de) 2009-11-05 2009-11-05 Verfahren zum Bearbeiten einer Einspritzdüse

Publications (2)

Publication Number Publication Date
EP2320064A1 EP2320064A1 (fr) 2011-05-11
EP2320064B1 true EP2320064B1 (fr) 2012-06-20

Family

ID=43048867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10174323A Not-in-force EP2320064B1 (fr) 2009-11-05 2010-08-27 Procédé de traitement d'une buse d'injection

Country Status (5)

Country Link
EP (1) EP2320064B1 (fr)
JP (1) JP5722588B2 (fr)
KR (1) KR101314932B1 (fr)
CN (1) CN102051459B (fr)
DE (1) DE102009046437B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016097467A1 (fr) 2014-12-17 2016-06-23 Wärtsilä Finland Oy Appareil d'autofrettage pour un élément de préchambre et procédé d'accroissement d'une résistance à la fatigue de celui-ci

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118484A1 (de) 2011-11-12 2013-05-16 Volkswagen Aktiengesellschaft Verfahren zur Steigerung der Festigkeit eines Bauteils
US9133802B2 (en) 2013-05-09 2015-09-15 Caterpillar Inc. Device for sealing orifices on nozzle of fuel injector for autofrettage process
KR101372150B1 (ko) * 2013-07-31 2014-03-10 김준모 인젝터의 노즐 홀 가공방법
JP6425689B2 (ja) 2016-07-15 2018-11-21 株式会社日本製鋼所 水素用圧力容器およびその製造方法

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JPS59134651A (ja) * 1982-09-08 1984-08-02 エクスツル−ド・ホ−ン，リミテツド 加工物表面を研磨する方法及び装置
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016097467A1 (fr) 2014-12-17 2016-06-23 Wärtsilä Finland Oy Appareil d'autofrettage pour un élément de préchambre et procédé d'accroissement d'une résistance à la fatigue de celui-ci
CN107107151A (zh) * 2014-12-17 2017-08-29 瓦锡兰芬兰有限公司 一种用于增加预燃室元件的疲劳强度的自增强装置和方法

Also Published As

Publication number Publication date
KR20110049662A (ko) 2011-05-12
KR101314932B1 (ko) 2013-10-04
DE102009046437B4 (de) 2018-04-19
JP2011099435A (ja) 2011-05-19
EP2320064A1 (fr) 2011-05-11
JP5722588B2 (ja) 2015-05-20
CN102051459B (zh) 2013-06-19
DE102009046437A1 (de) 2011-05-12
CN102051459A (zh) 2011-05-11

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