EP1472035A1 - Procede et dispositif pour obtenir une resistance a l'ecoulement determinee d'un canal d'ecoulement - Google Patents

Procede et dispositif pour obtenir une resistance a l'ecoulement determinee d'un canal d'ecoulement

Info

Publication number
EP1472035A1
EP1472035A1 EP03737266A EP03737266A EP1472035A1 EP 1472035 A1 EP1472035 A1 EP 1472035A1 EP 03737266 A EP03737266 A EP 03737266A EP 03737266 A EP03737266 A EP 03737266A EP 1472035 A1 EP1472035 A1 EP 1472035A1
Authority
EP
European Patent Office
Prior art keywords
flow
flow channel
determined
fluid
pressure
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.)
Withdrawn
Application number
EP03737266A
Other languages
German (de)
English (en)
Inventor
Peter Gosger
Armin Walther
Patrick Matt
Alfred Ernst
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.)
Extrude Hone GmbH
Original Assignee
Extrude Hone GmbH
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 Extrude Hone GmbH filed Critical Extrude Hone GmbH
Publication of EP1472035A1 publication Critical patent/EP1472035A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/001—Measuring fuel delivery of a fuel injector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/14—Making holes
    • B23H9/16—Making holes using an electrolytic jet
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow 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
    • 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
    • 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
    • F02M2200/9038—Coatings
    • 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
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y10T29/49771—Quantitative measuring or gauging
    • 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
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y10T29/49771—Quantitative measuring or gauging
    • Y10T29/49776—Pressure, force, or weight determining
    • 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
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53022—Means to assemble or disassemble with means to test work or product

Definitions

  • the invention relates to a method and a device for achieving a certain flow resistance of a flow channel, in particular an opening in a component.
  • the invention relates generally to the machining and dimensioning of flow channels, in particular openings or orifices, preferably small openings, in which it is important to achieve a critical flow resistance, as well as the exact matching of flow resistances in a number of such flow channels ,
  • parts are often cast or manufactured from a material that is selected for special properties such as conductivity or insulating effect for heat or electricity, light weight, expansion coefficient when heating or cooling, costs, etc., but with a different framework of requirements with regard to the inner surface of the Opening exists.
  • This particular their requirements for the internal passage can be met by plating or coating with a metal that has the desired properties.
  • Plating can be done by electroplating or electroless (autocatalytic) plating, while plating can be done by vapor deposition using a carrier gas or other such technique.
  • Electroless plating or vapor deposition is generally preferred for plating or coating the inner surface of castings, bores and the like where secondary cathodes are very difficult to place for uniform electroplating.
  • Parts with through-openings for a fluid are produced by a variety of casting and machining operations. For example, high-quality precision molding processes are used to manufacture such parts. Nevertheless, there are certain differences in the dimensions of such parts, in particular with regard to the wall thicknesses, which can be attributed to slight misalignment of the core or to a misalignment of the core, and also fluctuations in the surface texture, including the roughness of the surface, of dimples, Notches, grooves, bubbles or positive metal. In extreme cases, a very small crack in the core can lead to a thin wall that protrudes into an internal opening. All of these factors can significantly change the flow of the fluid.
  • Machining methods currently used such as electrical erosion machining and laser drilling, or less common techniques such as electron beam drilling, electrical current and so-called STEM drilling (an ECM technique that uses an acidic fluid) are not sufficiently accurate as that they could avoid the emergence of significant changes in flow resistance. Even the most accurate of these processes, electro-erosion machining, will not give a perfectly uniform flow resistance because the length of an internal passage is due to the machining used. processing may vary, which causes fluctuations in the overall hole length and flow resistance, regardless of the uniformity of the hole diameter. In addition, uneven conditions are inevitable in EDM machining and can lead to changes in size, shape, surface finish and the condition at the edge of the hole.
  • Orifices to be plated or plated must be oversized enough to allow a suitable thickness of plating or coating, and the final accuracy depends on the exact calculations for plating or coating rates and the accuracy of the drilling and plating operations .
  • the product achievable with current technology is not sufficiently uniform for most high-precision industrial applications. This results in a restriction of the manufacturer's options for manufacturing the entire part from materials with the properties desired for opening or for embedding drilled parts with prescribed properties in castings designed to accommodate them.
  • These techniques have the accuracy problems associated with drilling, as discussed above.
  • the plating of openings drilled into a material with metal of different properties or even with the same metal in such a way that an accuracy current results opens up new options in the manufacture of many parts.
  • Turbine blades manufactured in precision casting are typically cast or drilled in this way (by means of laser drilling, so-called STEM drilling or EDM machining) that results in a number of holes, which typically have a nominal diameter of approximately 0.3 mm to 0.8 mm and which extend from the inner passage to the vicinity of the profile front edge, the professional edge and run anywhere along the blade profile. Cooling air is drawn from the inside through the numerous holes are forced out into the high temperature combustion gas stream to cool the blade. Holes in the inner walls of the blade sometimes measure the distribution of the cooling air.
  • the method according to the invention for achieving a specific flow resistance of a flow channel, in particular an opening in a component comprises the following steps: a fluid flows through the flow channel; a parameter is determined which depends on the flow resistance of the flow channel in the component; the flow channel is processed using a working process until the parameter reaches a predetermined setpoint; and is characterized in that the characteristic variable is determined from a first measured variable and from a second measured variable, the first measured variable and the second measured variable being permitted to change over time.
  • the flow resistance of the flow channel is to be understood analogously to the electrical resistance of an electrical conductor.
  • the flow resistance of the flow channel counteracts the flow of a fluid flowing through the flow channel. This means that when a pressure difference is applied to the ends of the flow channel, a fluid flow through the flow channel flows with a certain flow rate, the flow rate being determined by the flow resistance.
  • the flow resistance can be defined, for example, by the quotient of the pressure difference falling across the flow channel and the flow rate.
  • the flow rate can have different units, for example that of a volume flow, a mass flow, or a particle flow.
  • a parameter is determined that represents a measure of the flow resistance.
  • the parameter does not necessarily have to be proportional to the flow resistance. It is sufficient if the parameter only depends on the flow resistance. There is preferably a clear, particularly preferably unambiguous, association between flow resistance and parameter.
  • the parameter can depend non-linearly on the flow resistance.
  • the pressure difference across the flow channel and the flow rate through the flow channel can be measured.
  • the flow rate can be measured using a calibrated resistance and a pressure measurement. It is also possible for at least one of the two measured variables to be determined by a combination of a pressure measurement and a flow rate measurement. This is the case, for example, when a performance is measured.
  • a service as defined in electrical engineering is analogously the product of pressure and flow rate.
  • the term measured variable is therefore to be understood generally. It is important that two measurement variables are measured in order to be able to calculate the fluctuation over time, so that a measure, as it represents the parameter, can be found for the flow resistance through the flow channel.
  • the temporal variations are eliminated by using a quotient of the time-resolved measured flow rate and the time to determine the parameter. resolved measured pressure is formed. In return, this enables a much higher fluctuation tolerance when determining the parameter and temporal fluctuations or variations can be accepted without the setting of the flow channel being influenced in a negative manner. As a result, pressure or flow rate stabilizing agents are superfluous, which considerably simplifies the process and thus makes it safer and cheaper.
  • the flow channel is processed using a working process until the parameter reaches a predetermined setpoint.
  • the working method for machining the flow channel is advantageously selected from the group of chemical machining, hydroabrasive machining, mechanical machining, electrochemical machining (ECM), electroerosion machining, electroplating, electroless plating, coating, and vapor deposition.
  • the measured variable is determined by measuring a pressure or by measuring a flow rate or by measuring a combination of pressure and flow rate.
  • a combination of pressure and flow rate represents a performance that is the product of pressure and flow rate.
  • the quotient for determining the parameter can also be determined with a pressure measurement and a power measurement.
  • the pressure of the fluid can be measured in relation to the ambient pressure of the atmosphere. Usual average pressures for machining the component on devices usually made of stainless steel are preferably above 20 bar, in particular above 50 bar, particularly preferably above 70 bar.
  • the setpoint is determined for a predeterminable mean flow rate and / or for a predeterminable mean pressure. This ensures that the parameter is a useful measure of the flow resistance and errors in determining the parameter due to non-linear flow properties of the fluid, for. B. due to turbulence at high flow rates can be avoided.
  • the fluctuation range of the temporal fluctuations is smaller than the mean fluctuation value, in particular less than 30%, preferably less than 20% of the mean fluctuation value.
  • the setpoint is determined with the aid of a master object.
  • the flow channel is exchanged with the master object and the parameter is then determined.
  • a desired flow resistance and thus the setpoint for the parameter are specified.
  • the flow channel is processed until the parameter and thus the flow resistance of the flow channel corresponds exactly to that of the master object.
  • At least one of the two measured variables is determined with the aid of at least one predetermined resistance.
  • a pressure measurement is e.g. Can be carried out inexpensively and precisely with commercially available means, such as with the aid of a piezometer.
  • the temporal variation of the amplitudes of the two measured variables can preferably be greater than 1%, in particular greater than 5%, preferably greater than 15%.
  • Detectors whose response time is less than the typical time constant of the fluctuation in the flow rate and / or the pressure are therefore suitably used for determining the measured variables. This ensures that the detectors completely record the fluctuations in time and thus there are no errors in the measured variables and thus in the determination of the characteristic variable on the basis of a temporal averaging.
  • the response time of the detectors is preferably less than the clock frequency of the device required for moving the fluid, such as a pump.
  • the response time of the detectors is advantageously in the millisecond range.
  • the fluid suitably includes electrolytic solutions, corrosive fluids, acids, alkalis, dielectric fluids and / or carrier gases.
  • flow channels such as. B. openings or other difficult to access hollow spaces can be processed from the inside in an advantageous manner.
  • the measured variables are advantageously determined using a lock-in method.
  • the pressure of the fluid flowing through the flow channel and / or the flow rate flowing through the flow channel is modulated with a modulation frequency, and the parameter in the corresponding modulation fire frequency is analyzed and amplified in a frequency-selective manner.
  • the pump that is used to convey the fluid is advantageously used to generate the modulation.
  • a piston pump specifies a modulation frequency based on its rotational frequency.
  • the noise of the detectors and / or the electronics e.g. thermal noise
  • the signal-to-noise ratio and thus the tolerances that can be achieved with the method when setting flow channels are improved by a factor of 100 to 1000.
  • the device according to the invention for achieving a specific flow resistance of a flow channel, in particular an opening in a component, preferably for carrying out the method according to the invention comprises a device for generating a fluid flow, a pressure sensor, a flow rate sensor and a fluid reservoir, a first line the fluid reservoir with the device for generating a fluid flow and a second line the device for generating a Connects fluid flow with the flow channel, and is characterized by a determination means for the dynamic determination of a parameter which characterizes the flow resistance of the flow channel.
  • the device according to the invention thus does not require components stabilizing pressure or flow rates, as proposed in the prior art.
  • the determination means determines a parameter which is a measure of the flow resistance of the flow channel.
  • the characteristic is cleared of the temporal fluctuations by forming the quotient from pressure and flow rate.
  • the determination means preferably comprises a computing unit for forming the quotient. It represents a part e.g. represents a control unit, which determines a parameter on the basis of the data from at least two detectors, with which the working method for processing the flow channel can be controlled.
  • the flow rate sensor comprises a resistor and a pressure meter, which are connected in parallel.
  • the flow rate can be determined with the aid of a pressure measurement, as a result of which the flow rate required for determining the characteristic variable is determined in a simple manner.
  • Both the pressure sensor and the flow rate sensor are arranged in the second line in the flow direction of the fluid in front of the flow channel.
  • the device according to the invention advantageously comprises a lock-in amplifier for improving the signal-to-noise ratio of the measured variables and thus the characteristic variable.
  • the measured variables or the parameter are frequency-selectively analyzed and amplified at a modulation frequency.
  • the device advantageously comprises a modulation frequency generator with which a modulation frequency is generated. The flow rate through the flow channel or the pressure of the fluid upstream of the flow channel is thus modulated with a modulation frequency.
  • a sensor detects the modulation frequency for the Lockin amplifier.
  • the modulation frequency generator is advantageously the pump that is used to convey the fluid.
  • FIG. 1 shows a first device according to the invention for achieving a specific flow resistance
  • Fig. 2 shows another device according to the invention.
  • FIG. 1 shows a first device according to the invention for achieving a specific flow resistance of a flow channel 1, in particular an opening in a component 2, with a fluid reservoir 9, a device 4 for generating a fluid flow, for example a generator, a pump, a Pressure accumulator or the like, a pressure gauge 10 with a resistor 8 and a pressure sensor -11.
  • the fluid 3 is pumped out of the fluid reservoir 9 with the aid of, for example, a piston pump 4 with the aid of a first line 5 and a second line 6 through the flow channel 1 of the component 2.
  • the pressure meter 10 with the resistor 8 represents a flow rate sensor 12.
  • the determining means 7 determines a parameter from the data provided by the flow rate sensor 12 and the pressure sensor 11.
  • the pressure drop across the flow channel 1 is preferably divided by the flow rate of the fluid flowing through the flow channel 1. As a result, the temporal fluctuations are eliminated and the parameter forms a measure of the flow resistance of the flow channel 1.
  • the fluid 3 emerging from the flow channel 1 flows out via an outlet 13 or emerges directly into the open.
  • the sequence of the pressure sensor 11 and the flow rate sensor 12 can be freely selected depending on the type or choice of sensors 11, 12 and the type of measurement. However, it is advantageous if both sensors 11, 12 are arranged in front of the component 2 in the flow direction of the fluid 3.
  • a parameter can be determined which represents a precise measure of the flow resistance of the flow channel 1. In particular, fluctuations such as e.g. can be caused by the pump 4, tolerated.
  • the determination means 7 calculates the fluctuations from the data which the pressure sensor 11 or the flow rate sensor 12 detects.
  • FIG. 2 shows an alternative device according to the invention for achieving a specific flow resistance of a flow channel 1 as in FIG. 1, with the difference that the flow rate is measured directly by the flow rate sensor 12.
  • the present invention relates to a method for achieving a specific flow resistance of a flow channel 1, in particular an opening in a component 2, and comprises the following method steps: a fluid 3 flows through the flow channel 1; a parameter is determined which depends on the flow resistance of the flow channel 1 in the component 2; the flow channel 1 is processed using a working method until the parameter reaches a predetermined target value; and is characterized in that the parameter is determined from a first measured variable and a second measured variable, the first measured variable and the second measured variable being allowed to change over time.
  • the method according to the invention and the device suitable for carrying out the method according to the invention are distinguished in particular by the fact that a certain flow resistance of a flow channel in components such as carburetor nozzles or gas turbine blades can be achieved with high precision, without there being neither particularly structural requirements for the quality of the device used Generation of a fluid flow or that pressure or flow rate stabilizing means are required, as has been proposed in the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un procédé pour obtenir une résistance à l'écoulement déterminée d'un canal d'écoulement (1), notamment d'une ouverture située dans un composant (2), ledit procédé comprenant les étapes suivantes : faire couler un fluide (3) à travers le canal d'écoulement (1); déterminer une grandeur caractéristique qui est fonction de la résistance à l'écoulement du canal d'écoulement (1) dans le composant (2) ; usiner le canal d'écoulement (1) selon un procédé d'usinage jusqu'à ce que la grandeur caractéristique atteigne une valeur de consigne prédéterminée. Ce procédé est caractérisée en ce que la grandeur caractéristique est déterminée à partir d'une première grandeur de mesure et d'une deuxième grandeur de mesure qui peuvent varier dans le temps. Ce procédé et le dispositif approprié pour la mise en oeuvre de ce dernier sont caractérisés notamment en ce qu'une résistance à l'écoulement déterminée d'un canal d'écoulement peut être obtenue avec une grande précision dans des composants tels que des gicleurs d'alimentation ou des ailettes de turbines à gaz, sans qu'il soit nécessaire de répondre à des exigences de construction particulières concernant la structure de l'installation utilisée pour produire l'écoulement de fluide, ni d'avoir recours à des moyens de stabilisation de la pression ou du débit, comme cela était le cas dans la technique antérieure.
EP03737266A 2002-02-04 2003-01-23 Procede et dispositif pour obtenir une resistance a l'ecoulement determinee d'un canal d'ecoulement Withdrawn EP1472035A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10204952A DE10204952A1 (de) 2002-02-04 2002-02-04 Verfahren und Vorrichtung zum Erzielen eines bestimmten Durchflusswiderstandes eines Strömungskanals
DE10204952 2002-02-04
PCT/EP2003/000634 WO2003066263A1 (fr) 2002-02-04 2003-01-23 Procede et dispositif pour obtenir une resistance a l'ecoulement determinee d'un canal d'ecoulement

Publications (1)

Publication Number Publication Date
EP1472035A1 true EP1472035A1 (fr) 2004-11-03

Family

ID=27618373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03737266A Withdrawn EP1472035A1 (fr) 2002-02-04 2003-01-23 Procede et dispositif pour obtenir une resistance a l'ecoulement determinee d'un canal d'ecoulement

Country Status (5)

Country Link
US (1) US20050076488A1 (fr)
EP (1) EP1472035A1 (fr)
AU (1) AU2003210177A1 (fr)
DE (1) DE10204952A1 (fr)
WO (1) WO2003066263A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1655093A1 (fr) * 2004-11-09 2006-05-10 Siemens Aktiengesellschaft Méthode d'usinage pour calibrer un trou passant.
DE102008043619A1 (de) 2008-11-10 2010-05-12 Robert Bosch Gmbh Verfahren und Vorrichtung zum Herstellen eines Werkstücks
DE102021110657A1 (de) * 2021-04-27 2022-10-27 MTU Aero Engines AG Verfahren zum überprüfen eines werkzeugs

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3365381A (en) * 1965-02-23 1968-01-23 Westinghouse Electric Corp Electrochemical machining including in-process guaging of the workpiece
US3753879A (en) * 1971-02-03 1973-08-21 Ass Eng Ltd Method and means for producing holes
JPS54117992U (fr) * 1978-02-08 1979-08-18
US4542346A (en) * 1982-12-07 1985-09-17 The United States Of America As Represented By The United States Department Of Energy Wide-range lock-in amplifier
US4995949A (en) * 1986-03-21 1991-02-26 Extrude Hone Corporation Orifice sizing using chemical, electrochemical, electrical discharge machining, plating, coating techniques
DE4437624A1 (de) * 1994-10-21 1996-04-25 Frembgen Fritz Herbert Verfahren zum elektrochemischen Bearbeiten von Strömungskanälen metallischer Werkstücke
DE59600963D1 (de) * 1996-04-20 1999-01-21 Frembgen Fritz Herbert Verfahren zum elektrochemischen Bearbeiten von Strömungskanälen metallischer Werkstücke
US5820744A (en) * 1996-09-30 1998-10-13 Doncasters, Turbo Products Division Electrochemical machining method and apparatus
DE19917043A1 (de) * 1999-04-15 2000-10-19 Frembgen Fritz Herbert Verfahren zum elektrochemischen Bearbeiten von Werkstücken

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03066263A1 *

Also Published As

Publication number Publication date
DE10204952A1 (de) 2003-08-21
US20050076488A1 (en) 2005-04-14
WO2003066263A1 (fr) 2003-08-14
AU2003210177A1 (en) 2003-09-02

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