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
  • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
  • B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
  • B24B31/116—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure
• • 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

Definitions

• the invention relates to a method for processing a Nozzle element for injection valves, which for injection of a fuel are provided in which a nozzle element is provided with at least one nozzle channel, the Diameter is smaller than a target diameter, and by an abrasive medium is passed through the nozzle channel, which Material is removed and the nozzle channel is enlarged.
• a generic method is based, for example, on the EP 0 277 957 B1.
• Abrasive medium used for machining nozzle openings becomes a visco-elastic in this known method
• This visco-elastic abrasive medium consists for example of a silicone mass, which is interspersed with finely divided abrasive particles.
• This visco-elastic abrasive medium one can Good machining of nozzle channel surfaces achieved on all sides become.
• the state values of this mass are during difficult to determine during processing. This has a relative cumbersome control of the machining process.
• For the necessary high-precision machining of the fine But nozzle openings is a quick and very exact measurement the actual value of the pressure or the volume flow of the Abrasive medium required.
• elaborate comparison tests are carried out, a correlation between the flow of the abrasive medium and that of fuel.
• a good control of the machining process is used in the further generic method the DE 197 00 304 C1 reached.
• this known method is the use of a liquid as an abrasive medium proposed which mixed with abrasive particles is.
• the use of solid particles in one Liquid always has the problem that sediment the particles in the liquid. This has a different distribution and concentration fluctuations of the abrasive particles in the liquid carrier medium result, which in turn leads to fluctuations in rheological Properties of the abrasive medium and thus the grinding result leads to the nozzle openings. These fluctuations also cause the flow characteristics of the spray orifices due to the liquid abrasive medium itself certain tolerances can be checked.
• a method is further described in DE 37 23 698 A1, where the static flow of nozzle bodies with prefabricated spray openings in a first Step is first measured, with the nozzle body with constant pressure from a test liquid becomes.
• the nozzle body with the abrasive abrasive so that this Abrasive flows through the nozzle openings and material removes.
• the nozzle body again with the test liquid and again the static flow is measured.
• the alternate Processing and checking steps are cyclical for as long repeated until a desired target value is reached is.
• the invention has for its object to provide a process for superfinishing a nozzle member for injection valves, in which both a particularly uniform treatment on the component as well as an easy controllability of the process are ensured.
• the method according to the invention is characterized in that that a mixture is used as the abrasive medium, which as components either a carrier fluid based on mineral oil and an organophilic clay mineral or a carrier liquid water-based and a hydrophilic clay mineral includes, and that defines the components of the mixture are selected, the mixture being largely the same rheological properties as that for the injector provided fuel provided.
• a mixture is used as the abrasive medium, which as components either a carrier fluid based on mineral oil and an organophilic clay mineral or a carrier liquid water-based and a hydrophilic clay mineral includes, and that defines the components of the mixture are selected, the mixture being largely the same rheological properties as that for the injector provided fuel provided.
• a basic idea of the invention is based on the knowledge that accordingly, certain clay minerals on the one hand for fine machining are suitable according to the invention and on the other hand due to their organophilic or hydrophilic properties with no significant tendency to sedimentation in one Carrier liquid based on mineral oil or water stay dispersed. Because of their molecular structure and ion distribution, the clay minerals can form strong Vander-Waalsche bonds with the appropriate carrier liquid come in. These special clay minerals are together selected with the carrier liquid so that the Mix largely the rheological properties of the fuel provided for the injector. According to the invention, this results in a uniform distribution which ensures particles in the carrier liquid, the flow behavior of the abrasive medium during processing of the nozzle element approximately the flow behavior of the intended Corresponds to fuel. It can be done without elaborate Execution of several processing and test cycles in the desired spray pattern of the fuel set on the nozzle with very high accuracy become. This is more economical for the production of modern Internal combustion engines of essential importance.
• a powdered, crystalline clay mineral whose particles have a layered structure.
• This layered structure ensures that that the particles of the clay mineral are particularly large Have surface and thus a particularly good connection build up to the molecules of the carrier liquid can.
• bentonite is used as the clay mineral is used, which for setting the desired Properties is treated chemically.
• Bentonite can for example treated with an acid or a base be, with appropriate ion exchange reactions
• a desired organophilic or hydrophilic Property can be set.
• the chemical treatment can by a so-called activator substance on acid or Base base made of the clay mineral during manufacture is added to the mixture with the carrier liquid. In this way, the properties of the abrasive medium, for example the viscosity, and even one Thixotropy can be set.
• Carrier liquid is particularly cost-effective Carrier liquid. According to the invention it is for a very precise machining of fine channels with a diameter of up to at most 1 mm advantageous as a carrier liquid the fuel or a substitute with appropriate rheological properties is used.
• a carrier liquid can be diesel or gasoline or this commercially available non-combustible substitutes for production of the abrasive medium can be used.
• the powdered, crystalline clay mineral which has a particle size of Can have 0.1 ⁇ m to 100 ⁇ m, the fine machining to execute the nozzle element immediately.
• the abrasive medium additional abrasive particles can be added.
• This additional conventional abrasive materials for example Silicon carbide, boron carbide or diamond dust his.
• the abrasive particles can be between 0.5 to 5% of the weight of the abrasive medium.
• the Flow of the abrasive medium during the abrasive Processing like the flow of fuel in a target operation is set. So the invention abrasive liquid itself for the precise processing of a Swirl nozzle can be used, both radially after inside leading channels as well as the axial pointed hole to be edited.
• a jet of the abrasive according to the invention Liquid turns with a strong rotation provided by which a reliable smoothing of the Point hole is reached.
• the pressure of the abrasive medium is measured and that at Abrasive processing is ended when a target pressure is reached becomes.
• the abrasive liquid is defined with a Volume flow passed through the nozzle element, the a measurable pressure drop which is a measure of the Processing progress on the nozzle element is.
• the volume flow corresponds to a target volume flow of the nozzle element selected during operation or one selected this state very close value so that an immediately comparable or at least very close Correlation to the actual operating conditions of the nozzle element is given. Editing the Nozzle element thus takes place at a relatively high pressure of about 100 bar and more.
• an injection valve 10 is an approximately rectangular nozzle element in an annular housing 20 12 used. Between the ring housing 20 and the Nozzle element 12 is configured with four feed channels 22, through which fuel flow vertically to the plane of the drawing can. In the nozzle element 12 are to form a so-called swirl nozzle several, approximately radially directed Nozzle channels 14 with a very small diameter below 1 mm trained. These radially directed nozzle channels 14 open tangentially into an axially running, central one Spray hole 16 in the nozzle element 12. In the assembled Injector 10 is coaxial in the spray hole 16 a smaller diameter needle 18, with which the spray pattern of the injection valve 10 can be influenced.
• This swirl nozzle which is used in modern low-consumption and pollutant Internal combustion engines can be used special spray pattern of the fuel essentially through this reaches the fuel from the feed channels 22 via the radially directed nozzle channels 14 with their Nozzle openings 15 approximately tangentially into the spray hole 16 are injected, in which the tangential Fuel jets with an axially directed fuel jet overlay.
• This overlap results in a very good swirl or swirl which occurs when entering into the combustion chamber of a combustion cylinder for a desired combustion-promoting spray pattern worries.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Nozzles (AREA)

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• 2000
  • 2000-03-30 DE DE10015875A patent/DE10015875C2/de not_active Expired - Fee Related
• 2001
  • 2001-03-26 EP EP01107396A patent/EP1145801B1/fr not_active Expired - Lifetime
  • 2001-03-26 DE DE50100302T patent/DE50100302D1/de not_active Expired - Fee Related
  • 2001-03-26 AT AT01107396T patent/ATE242682T1/de not_active IP Right Cessation

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