WO2017060150A1 - Procédé d'usinage d'une pièce pour un injecteur de fluide et procédé de fabrication d'un corps de buse pour un injecteur de fluide. - Google Patents

Procédé d'usinage d'une pièce pour un injecteur de fluide et procédé de fabrication d'un corps de buse pour un injecteur de fluide. Download PDF

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Publication number
WO2017060150A1
WO2017060150A1 PCT/EP2016/073277 EP2016073277W WO2017060150A1 WO 2017060150 A1 WO2017060150 A1 WO 2017060150A1 EP 2016073277 W EP2016073277 W EP 2016073277W WO 2017060150 A1 WO2017060150 A1 WO 2017060150A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
electrodes
injection hole
nozzle body
workpiece
Prior art date
Application number
PCT/EP2016/073277
Other languages
German (de)
English (en)
Inventor
Ferdinand Löbbering
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2017060150A1 publication Critical patent/WO2017060150A1/fr

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Classifications

    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/04—Electrodes specially adapted therefor or their manufacture
    • 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

Definitions

  • the invention relates to an apparatus for processing a workpiece and a method for producing a nozzle body for a fluid injector, in which a Rohdüsen redesign is processed by means of an electrochemical machining operation.
  • an apparatus for machining a workpiece for a fluid injector comprises a first electrode and a second electrode, each for machining the workpiece by means of an electrochemical machining process comprising electrochemical ablation.
  • the device further comprises a holding element, which is coupled to the first and second electrodes and which is formed from ⁇ to apply to the first and second electrodes each have a predetermined voltage waveform.
  • the first and / or second electrode are further coupled with respect to a central axis in each case axially movable with the holding element.
  • a controllable tool is realized, which by means of electrochemical removal, in particular erosion, in a simple and reliable manner allows adjusting a contour of the workpiece and forming recesses and penetrating openings in or on the workpiece.
  • Such a tool can be used in particular to ector in a manufacturing of a nozzle body for a Fluidinj one or more injection holes having a predetermined geometry in a wall of the nozzle body a ⁇ accommodate.
  • the first and second electrodes realize a double electrode which can perform translational, rotational and / or oscillatory movements.
  • the two electrodes can be controlled depending on or independently of each other. Independent control comprises various mechanical movements as well as different voltage profiles at the respective electrode.
  • workpieces with large wall thicknesses such as nozzle tips of high-pressure injectors, can be processed reliably in order, in particular, to introduce injection holes with predetermined geometry.
  • the large wall thicknesses of such Fluidinj ectors are due to component loads due to high injection pressures of a fluid to be fed, which are sought to meet emissions legislation requirements. High injection pressures act on the one hand to an advantageous consumption of fuel and emission of harmful substances, but on the other hand adversely affect a Strahlaufbe ⁇ reitung be fed the fluid, in particular fuel.
  • a length-to-diameter ratio of a respective injection hole in the region of an associated exit orifice is locally corrected or adjusted so as not to globally weaken the nozzle tip in a material-specific manner.
  • the injection hole is formed, for example, with a stepped geometry, which can be produced in a simple manner precisely and reliably by means of the device described.
  • the double electrode makes it possible, by means of electrochemical removal, to form an injection hole with a locally reduced spray hole length.
  • first and second electrode By using a first and a second electrode, a desired gradation or a predetermined offset of the respective injection hole can be selectively generated by means of the device during electrochemical removal.
  • the first and second electrodes are in terms of their geometries designed or provided according to form the injection hole ⁇ a predetermined step geometry.
  • the raw nozzle body is an anode while the first and second electrodes each realize a cathode.
  • Rohdüsen redesign between the double and the electrode of the device a predetermined voltage curve or a predetermined Potenti ⁇ aldifferenz is applied to initiate an electrochemical machining, in particular eroding.
  • an electrolyte is introduced between the raw nozzle body and the electrodes in order, inter alia, to moisten the part of the wall of the raw nozzle body to be machined and the electrodes, to surround it, and to take up removed material.
  • the cathode is hardly worn as a tool and it is possible to produce a large number of nozzle bodies with substantially constant geometry of the injection holes.
  • the fact that such a removal of material of the workpiece takes place substantially without mechanical contact, is not a chip method, so that properties such as hardness and toughness of the material to be removed are not significantly limiting parameters for the electrochemical machining process.
  • the wall of the Rohdüsen stresses can be specifically processed.
  • the respective predefined voltage profile can vary over time and is adapted, for example, to a distance between the raw nozzle body and the respective electrode. This allows a precise and controlled removal of material of the workpiece according to the predetermined geometry of the first and / or second electrode and forming a stepped injection hole.
  • the second electrode has a recess in which the first electrode is partially arranged.
  • the second electrode for electrochemical ablation and is formed in addition to the receptacle and holder for the first electrode.
  • the first electrode is partially clamped in the recess of the second electrode, so that a stable double electrode is realized, which allows a reliable electrochemical erosion removal.
  • the first electrode is designed as a solid wire and the second electrode as a hollow wire.
  • the electrodes are made of a heat-resistant material, for example tungsten, in order to enable a device for electrochemically removing and eroding material of the workpiece to be machined with a long service life of the tool.
  • a heat-resistant material for example tungsten
  • the first and second electrodes of the device advantageously comprises a material having a high conductivity to enable an efficient electrochemical ⁇ premix removal by means of erosion by applying a respective predetermined voltage profile.
  • the first and second electrodes are cylindrical.
  • the first cylindrical electrode has a first diameter and the second cylindrical electrode has a second diameter which is greater than the first diameter.
  • the second electrode may also be referred to as an outer electrode and may be moved independently of the first electrode, which may be referred to as an inner electrode.
  • the gradation or the injection ⁇ lochokuza ein be formed independently of a narrower injection hole channel, which is formed by means of the inner electrode.
  • Geometry of the gradation and the injection hole ⁇ channel are specified by the respective geometry of the outer and inner electrode. According to a development of the device, the first and second electrodes can be controlled independently of one another.
  • the two electrodes synchronous and / or rectified translational
  • the device has an insulation, which is arranged between the first and the second electrode in order to isolate the first and the second electrode from each other.
  • Such insulation is particularly necessary when the first and second electrodes with different voltage ⁇ gradients are applied and the first and second electrodes to be controlled independently of each other.
  • the retaining element has at least one collet, which is coupled to the first and / or second electrode.
  • the retaining element has two collets, one of which is coupled to the first electrode and the other to the second electrode.
  • a method for producing a nozzle body for a fluid injector comprises providing a raw nozzle body having a Rohdüsen endeavorausnaturalung limited, based on a central axis from a first axial end of the Rohdüsen emotionss by a Rohwand between the Rohdüsen redesignausnaturalung and an outer region of the Rohdüsen emotionss.
  • the method further comprises providing a device according to the first aspect and removing a part of the raw wall by means of the device in a region of a second axial end with respect to the
  • Such a method for producing a nozzle body for a fluid injector comprises, in particular, machining the Rohdü ⁇ sen stressess using an embodiment of the device described above, so that all the features and characteristics of the device are also disclosed for the method for producing a nozzle body and vice versa.
  • the method further comprises introducing the electrolyte into a remaining free volume between the tube body and the first and second electrodes.
  • the method comprises applying a respective predetermined voltage profile between the raw nozzle body and the first and / or second electrode.
  • the method comprises a removal of a part of the raw wall by means of the device and thereby forming the injection hole with cone-shaped geometry.
  • an injection hole with a conical geometry for example by the first and second electrodes having a predetermined angle to a rotation axis of the device.
  • Such an angle relates, for example, to a rotationally symmetric central axis of the device and the holding element, so that the first and second electrodes are clamped in a controlled manner with a predetermined inclination to this central axis in the holding element.
  • an injection hole thus formed has an inner orifice facing the green body recess and having a larger diameter than an associated outer orifice at the upstream end of the injection hole or the injection hole channel.
  • a stepped geometry of the injection hole is also possible with a cone-shaped injection hole channel.
  • the method comprises a removal of a part of the raw wall by means of the device and thereby forming the injection hole with a cylindrical geometry.
  • the method comprises a removal of a part of the raw wall by means of the device and thereby forming the injection hole with a first and second cylindrical section with different dimensions. different diameters, which are formed depending on the geometry of the first and second electrodes.
  • the electrochemical machining operation comprises rotation and / or translation and / or oscillation of the first and / or second electrode in the axial direction with respect to a central axis of the first and / or second electrode.
  • Rotation, translation and / or oscillation of the first and / or second electrode useful opportunities in the context of an electrochemical machining operation to allow an efficient and accurate removal of material of the Rohdüsen stressess.
  • the electrodes which move with each other or with each other lead to an improved media exchange of the electrolyte and the removed material of the raw nozzle body, so that a better rinsing effect is produced, which contributes to a precise machining of the raw nozzle body and forming the injection hole.
  • asymmetries and / or existing roundness errors of the first and / or second electrode do not or only slightly affect the symmetry of the adapted regions.
  • FIG. 1 shows an exemplary embodiment of an apparatus for processing a workpiece for a fluid injector
  • FIG. 2 shows the device according to FIG. 1 in a further view
  • FIG. 3 shows the introduction of an injection hole into a raw-nozzle body by means of the device according to FIGS. 1 and 2
  • FIG. 4 shows a further embodiment of the device for
  • FIG. 1 shows a sectional view of an embodiment of a device 1 for processing a workpiece, which has a first electrode 3, a second electrode 5 and a holding element 7.
  • the first and second electrodes 3, 5 and the holding element 7 are axially ⁇ symmetrically arranged with respect to a central axis 4 and allow processing of a workpiece by means of an electrochemical machining operation, which comprises electrochemical ablation.
  • a respective predetermined voltage curve is applied to the first and / or second electrode 3, 5 and thus enables an electrochemical removal or erosion of material of the workpiece.
  • the device 1 thus comprises a double electrode by means of which it is possible for the workpiece to easily and reliably adapt a contour of the workpiece or to form recesses and penetrating openings in or on the workpiece.
  • a tool can be used, in particular, to introduce one or more injection holes 17 with a predetermined geometry into a wall 15 of a raw nozzle body 10 when producing a nozzle body for a fluid injector.
  • the two electrodes 3, 5 can be driven together or independently of one another.
  • This comprises different voltage profiles which are applied to the respective electrodes 3 and 5 and also different mechanical movements.
  • Such mechanical movements are indicated in Figure 1 by arrows and illustrate that in each case rotational, translational and / or oscillatory movements of the first and / or second electrode 3 and 5 are possible.
  • the first and second electrodes 3 and 5 are rotationally symmetrical in this exemplary embodiment and have a cylindrical geometry.
  • the second electrode 5 has a larger diameter than the first
  • Electrode 3 introduced by means of the device 1 a stepped injection hole 17 provided in a Rohdü- senanalysis 10 and a desired length by knife ⁇ ratio of the injection hole can be realized 17th
  • the predetermined geometry of the two electrodes 3 and 5 has a corresponding effect on the geometry of the injection hole 17 to be formed during erosion.
  • the second electrode 5 may also be referred to as an outer electrode and independently the first electrode 3 may be referred to as an inner electrode.
  • a stepping or a Einspritzlochuza ein be formed, while by means of the inner electrode 3, a narrower injection hole channel is formed.
  • Such a stepped injection hole 17 is advantageous with regard to emission parameters of an associated internal combustion engine to be complied with and with regard to a useful jet preparation of a fluid emerging through the injection hole 17.
  • a length of the injection hole channel and a geometry of the injection hole Frei ein on an outer side of the nozzle body are inter alia dependent on a wall thickness of the nozzle body and a pressure of the exiting through the injection hole 17 fluid which fancles after exiting the nozzle body. Accordingly, the first and second electrodes 3 and 5 are adapted or provided with respect to their geometry.
  • the double electrode is guided for example by means of a collet and acted upon by a predetermined voltage curve.
  • the holding element 7 has two collets, one for each of the first and second electrodes 3 and 5.
  • Figure 2 shows the device 1 of Figure 1 in a perspective view, in which it can be seen that the first electrode 3 is partially arranged in this embodiment in the second electrode 5 and clamped, for example.
  • the second electrode 5 has a recess and a slot 6, which allow easy recording and clamping of the first electrode 3.
  • the first electrode 3 is formed for example as a solid wire, while the second electrode 5 is realized as a hollow wire.
  • the double electrode of the device 1 has a wire-in-wire geometry, which allows a beneficial processing of a work ⁇ piece by means of electrochemical ablation.
  • FIG. 3 illustrates insertion of the injection hole 17 into the wall 15 of the raw nozzle body 10 by means of the device 1.
  • the injection hole 17 is formed by leading the two electrodes 3 and 5 to the raw nozzle body from an outer area through the wall 15 to a Rohdüsen redesignaus principleung 13 which is delimited along a central axis 14 from a first axial end 11 to a second axial end 12 through the wall 15 of the raw nozzle body 10.
  • n n
  • the first electrode 3 forms the narrower injection channel and the second electrode 5 the gradation of the stepped injection hole 17.
  • the first and / or second electrodes 3 and 5 have predetermined lengths with respect to the central axis 4 of the device 1. This also includes a slight removal of the two electrodes 3 and 5 themselves, so that the geometry of the double electrode is designed accordingly.
  • an electrolyte is introduced between the raw nozzle body 10 and the electrodes 3 and 5, in order, inter alia, to wet the part of the wall 15 of the raw nozzle body 10 to be processed and the electrodes 3 and 5, to flush it around and to pick up removed material.
  • a portion of the material of the raw nozzle body 10 is in solution with the electrolyte and is removed by chemical bonding with ions of the electrolyte, so that without contact with the electrodes 3 and 5, the wall 15 of the Rohdüsen stressess 10 is electrochemically processed and the injection hole 17 is formed can be.
  • Rohdüsen endeavor 10 realized as an anode and the two electrodes 3 and 5, a respective cathode, so that due to a potential difference between anode and cathode is a substantially non-contact material removal of Rohdüsen stressess 10 is possible.
  • the electrodes 3 and 5 are hardly worn as a tool and it is possible to produce a large number of nozzle bodies with substantially constant geometry of the injection holes 17.
  • the injection hole 17 can be precisely and reliably introduced into the raw nozzle body 10, without requiring further time-consuming and costly process steps.
  • forming by means of electrochemical removal offers advantages over methods such as drilling or polygonal cutting.
  • FIG. 4 illustrates a further possible embodiment of the device 1 which, in contrast to the previously described embodiments, has a conical or frusto-conical second electrode 5.
  • the first electrode 3 is also arranged in the second electrode 5 and formed in comparison to this much narrower to form a correspondingly narrow geometry of the injection hole channel of the injection hole 17 from ⁇ .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

Dispositif (1) d'usinage d'une pièce, comprenant une première électrode (3) et une seconde électrode (5) qui sont respectivement conçues pour usiner la pièce par un processus d'usinage électrochimique impliquant un enlèvement de matière par voie électrochimique. Le dispositif (1) comprend en outre un élément de support (7) qui est relié en déplacement axial à la première et à la seconde électrode (3, 5), et qui est conçu pour appliquer une courbe de tension prédéterminée respective à la première et à la seconde électrode (3, 5).
PCT/EP2016/073277 2015-10-06 2016-09-29 Procédé d'usinage d'une pièce pour un injecteur de fluide et procédé de fabrication d'un corps de buse pour un injecteur de fluide. WO2017060150A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015219233.4A DE102015219233A1 (de) 2015-10-06 2015-10-06 Vorrichtung zum Bearbeiten eines Werkstücks für einen Fluidinjektor und Verfahren zum Herstellen eines Düsenkörpers für einen Fluidinjektor
DE102015219233.4 2015-10-06

Publications (1)

Publication Number Publication Date
WO2017060150A1 true WO2017060150A1 (fr) 2017-04-13

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PCT/EP2016/073277 WO2017060150A1 (fr) 2015-10-06 2016-09-29 Procédé d'usinage d'une pièce pour un injecteur de fluide et procédé de fabrication d'un corps de buse pour un injecteur de fluide.

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DE (1) DE102015219233A1 (fr)
WO (1) WO2017060150A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1498207A1 (fr) * 2003-06-17 2005-01-19 Elenix Inc. Machine pour usiner des petits trous par usinage par étincelage et machine pour l'usiner par étincelage à plusieures reprises de matrices et de petits trous, anisi qu'une méthode d'usinage par étincelage de multiples trous et matrices.
US20150122636A1 (en) * 2013-11-06 2015-05-07 Hon Hai Precision Industry Co., Ltd. Electrochemical machining device
US20150129417A1 (en) * 2013-11-11 2015-05-14 Hon Hai Precision Industry Co., Ltd. Electrochemical machining apparatus
WO2015122103A1 (fr) * 2014-02-17 2015-08-20 国立大学法人東京農工大学 Appareil d'usinage électrochimique, procédé d'usinage électrochimique, et électrode-outil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE795869A (fr) * 1972-04-19 1973-06-18 Gen Electric Electrode pour l'usinage par voie electrolytique
GB8817774D0 (en) * 1988-07-26 1988-09-01 Lucas Ind Plc Fuel injectors for i c engines
FR2820066B1 (fr) * 2001-02-01 2003-03-07 Snecma Moteurs Dispositif de centrage et de percage de formes et de trous cylindriques
JP2006110712A (ja) * 2004-09-17 2006-04-27 Minebea Co Ltd 電解加工冶具、それを用いた電解加工方法及びその用途
DE102004056158B3 (de) * 2004-11-17 2006-03-30 Siemens Ag Verfahren zum Überwachen eines elektrochemischen Behandlungsprozesses und für dieses Verfahren geeignete Elektrodenanordnung
DE102009032563A1 (de) * 2009-07-10 2011-01-13 Mtu Aero Engines Gmbh Vorrichtung und Verfahren zum elektrochemischen Abtragen einer Oberfläche eines Bauteils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1498207A1 (fr) * 2003-06-17 2005-01-19 Elenix Inc. Machine pour usiner des petits trous par usinage par étincelage et machine pour l'usiner par étincelage à plusieures reprises de matrices et de petits trous, anisi qu'une méthode d'usinage par étincelage de multiples trous et matrices.
US20150122636A1 (en) * 2013-11-06 2015-05-07 Hon Hai Precision Industry Co., Ltd. Electrochemical machining device
US20150129417A1 (en) * 2013-11-11 2015-05-14 Hon Hai Precision Industry Co., Ltd. Electrochemical machining apparatus
WO2015122103A1 (fr) * 2014-02-17 2015-08-20 国立大学法人東京農工大学 Appareil d'usinage électrochimique, procédé d'usinage électrochimique, et électrode-outil

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