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WO2008104243A1 - Procédé et dispositif pour usiner une ouverture de passage, en particulier dans un injecteur de carburant - Google Patents

Procédé et dispositif pour usiner une ouverture de passage, en particulier dans un injecteur de carburant Download PDF

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Publication number
WO2008104243A1
WO2008104243A1 PCT/EP2008/000075 EP2008000075W WO2008104243A1 WO 2008104243 A1 WO2008104243 A1 WO 2008104243A1 EP 2008000075 W EP2008000075 W EP 2008000075W WO 2008104243 A1 WO2008104243 A1 WO 2008104243A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow test
calibration step
fluid
flow
grinding
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.)
Ceased
Application number
PCT/EP2008/000075
Other languages
German (de)
English (en)
Inventor
Herbert Frankl
Florian Klimmer
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.)
Sonplas GmbH
Original Assignee
Sonplas 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 Sonplas GmbH filed Critical Sonplas GmbH
Publication of WO2008104243A1 publication Critical patent/WO2008104243A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a method for processing a passage opening, in particular in a fuel injector, according to the preamble of claim 1.
  • a method for processing a passage opening in particular in a fuel injector, according to the preamble of claim 1.
  • an ablation fluid is passed through the passage opening with material removal.
  • the invention further relates to a device for processing a passage opening, in particular in a fuel injector, with the features of the preamble of claim 10.
  • a generic device has, inter alia, means for passing a Abtragungsfluids through the passage opening.
  • a generic method for hydro-erosive rounding of an edge in a channel is known from WO 2004/004973 A1.
  • a two-stage grinding process can be provided in which a high-viscosity liquid is ground to a definable distance from a target value in a first stage. Subsequently, in a second stage, a target fluid may be ground to the target value, the target fluid corresponding to a test oil that has been spiked with abrasive particles.
  • WO 99/58296 A1 discloses a system for processing a microhole with a plurality of processing stations, wherein a grinding station is traversed by a component twice in succession.
  • DE 101 51 461 A1 describes a grinding method using a magnetic field-sensitive grinding medium, wherein a desired material removal is set during the grinding process by varying the field strength of a magnetic field.
  • Another method for processing a through opening is known, for example, from DE 100 15 875 A1.
  • This document teaches to provide a nozzle channel in a nozzle element whose diameter is smaller than a nominal diameter, and to enlarge the nozzle channel by passing an abrasive medium, wherein the abrasive medium has at least approximately the same rheological properties as the fuel provided for the injection valve.
  • EP 1 611 995 A1 discloses a method for abrasive machining of a passage opening of a component, in which work is initially carried out with constant abrasive pressure and then with a constant volume of abrasive material.
  • hydroabrasive grinding methods are known, for example, from DE 197 00 304 C1 and EP 1 611 995 A1.
  • a basic idea of the invention can be seen in carrying out the hydroerosive grinding process at least in two stages, wherein ablation fluids which differ in at least one material property are used in the two different stages.
  • the combination of two different ablation fluids makes it possible to exploit the desired processing properties of the individual ablation fluids without disturbing any undesirable properties that may be present.
  • a High-precision flow calibration can be achieved with low processing times.
  • the ablation fluids are conveniently liquids.
  • the invention can be used in particular for processing through-openings of nozzles and throttles, wherein the through-opening can be, for example, a nozzle channel.
  • the processing may on the one hand comprise a diameter extension of the passage opening.
  • the machining may also include a rounding of inlet edges of the through-opening and / or a conification of the through-opening.
  • the invention has recognized that with high erosion fluids based on highly viscous media such as, for example, sludges and / or pastes and known from the so-called "abrasive flow machining", high degrees of rounding with low bore deformation can be achieved a number of applications will be inadequate.
  • the invention makes it possible to combine the advantages of the two mentioned media, wherein undesired effects can be largely suppressed.
  • a high-precision flow calibration of nozzles and throttles with high degrees of rounding of typically 15 Up to 50% increase in flow can be achieved by rounding the nozzle inlet edges and simultaneous conification of the nozzle channels without significant negative impact on the nozzle geometry.
  • the removal fluids used in the various steps could have the same chemical composition and, for example, be passed through the passage opening at different temperatures, so that different viscosities are given.
  • the two ablation fluids have a different chemical composition, so that a particularly simple and reliable process control is given.
  • at least the ablation fluid used in the finished calibration step has properties similar to those of an operating fluid for which the finished through-opening is provided.
  • this ablation fluid may have fuel-like properties, in particular flow properties.
  • the removal fluid used in the final calibration step has a lower abrasive action than the ablation fluid previously used in the grinding step.
  • an aggressive abrasive medium is first used, which allows a fast grinding process with high levels of rounding with short processing times. Subsequently, a little aggressive abrasive medium, especially with fuel-like properties, is used, in which the grinding process is slower, so that a particularly accurate process control and precise flow calibration is given.
  • the ablation fluid used in the final calibration step has a lower viscosity than the erosion fluid previously used in the grinding step. Since the abrasive effect usually correlates positively with the viscosity, such a procedure can easily achieve an accurate flow calibration with short processing times.
  • Via procedure can easily achieve an accurate flow calibration with short processing times.
  • Via procedure can easily achieve an accurate flow calibration with short processing times.
  • Via procedure can easily achieve an accurate flow calibration with short processing times.
  • the viscosities can be understood according to the invention, in particular the conditions prevailing at grinding conditions viscosities, ie the viscosities in the conditions prevailing in the abrasive passage through the passage opening conditions.
  • the effort required to carry out the invention can be further reduced by the fact that the ablation fluid used in the final calibration step has a lower abrasive component than the ablation fluid previously used in the abrading step. Since the aggressiveness of an abrasive medium usually correlates positively with the abrasive grain content, by varying the abrasive grain content in the individual steps, the advantageous short processing times with precise flow calibration can be realized in a particularly simple manner.
  • the machining precision is further improved according to the invention by determining the abrasive progress during the grinding step and terminating the grinding step when the abrasive advance has reached a target value that differs from a desired final value by a predetermined value.
  • a target value that differs from a desired final value by a predetermined value.
  • the abrasion progress may, in particular, be understood as meaning the degree of rounding of the passage opening.
  • a particularly simple procedure is given according to the invention in that for determining the Abrasivfort Kunststoff.es a flow of Abrasivfluides is measured through the passage opening.
  • the flow rate or the flow rate can be determined, these parameters are at a predetermined pressure in connection with the dimensions of the passage opening.
  • Such an embodiment is particularly advantageous when working with a constant Abrasivfluid Anlagen.
  • a flow test is carried out in which preferably a test fluid is passed through the passage opening.
  • a flow rate test is performed at a time when no material removal takes place, which allows a particularly high accuracy.
  • the finish-calibrating step is performed depending on the result of the flow-through test, which may be advantageous in particular for high component throughput with high machining precision.
  • provision may be made to omit the finished calibration step in a particular case if the component properties existing after the grinding step are already within the range of wished to have final tolerance range.
  • the operating parameters of the finished calibration step for example the processing time, depending on the result of the flow test.
  • the abrasive progress may still be determined, for example, by determining the flow or pressure of the abrasive slurry, and making the duration of the finish calibration step dependent on the abrasive advance determined thereby.
  • the control mode of the finish calibration step is made dependent on the result of the flow test.
  • the control in the final calibration step depending on the result of the flow test time-controlled or progressively controlled.
  • Time control can be understood to mean that the finished calibration step is ended after a predetermined time has elapsed.
  • progress control it can be understood that the abrasive progress in finish calibration is measured and the duration of the finish calibration step is made dependent on the abrasive progress determined thereby.
  • the progress control may be a flow control in which the flow of the abrasive fluid is determined during the finish calibration step and the finish calibration is terminated upon reaching a target value for the flow.
  • the through-hole between the grinding step and the finished calibration step is cleaned by passing a cleaning fluid.
  • a cleaning fluid may have the same properties as the test fluid.
  • a backpressure is generated downstream of the passage opening.
  • a back pressure unwanted cavitation effects in the region of the passage opening can be counteracted and thus a particularly high precision can be achieved.
  • this back pressure makes it possible to simulate the pressure conditions prevailing during the operation of a fuel injector, so that, in particular, a particularly meaningful flow measurement is provided.
  • a further cleaning step and / or a further flow test are carried out, for which purpose a corresponding cleaning fluid or test fluid can be passed through the passage opening. If one or more flow test steps are provided, these can be reversibly formed and it can be worked with or without back pressure.
  • a feature resides in the fact that means for passing a further removal fluid of different nature through the passage opening are provided for the subsequent finish calibration.
  • the device according to the invention can be set up in particular for carrying out the method according to the invention, whereby the advantages explained in this connection can be achieved.
  • the invention allows for high levels of rounding a particularly precise flow calibration. Even with complex geometries of the through holes unwanted bore deformations can be largely avoided.
  • the integrated component cleaning makes it possible to largely prevent unwanted component contamination.
  • the inventive method and the device according to the invention allow an integrated process control and regulation, wherein the two successive grinding processes can be controlled on the basis of flow measurements and / or pressure measurements. Experiments have shown that, with an average processing time, ie cycle time, of about 40 s, rounding degrees of up to 40% and more at flow tolerances ⁇ 1% with a capability index C pk > 1.66 can be achieved with the invention.
  • Fig. 1 is a schematic view of a device according to the invention for
  • FIG. 2 shows a process flow diagram for explaining the method according to the invention.
  • FIG. 1 A device according to the invention for carrying out the method according to the invention is shown schematically in FIG.
  • the apparatus comprises a grinding station 1 for the grinding step, a first cleaning station 2, a first flow testing station 3, a second grinding station 4 for the finishing calibration step, a second cleaning station 5 and a second flow testing station 6.
  • a conveyor not shown in detail is provided, which may be formed, for example, as a rotary table conveyor or as a linear conveyor.
  • the first grinding station 1 has a pressure generating device 11, by means of which the abrading means used in the first grinding step is subjected to a pressure.
  • a line 12 for supplying the Abtragungsfluides to the through hole 7 is provided.
  • a discharge device 13 is arranged for the Abtragungsfluid, which may optionally serve for the preparation of Abtragungsfluides and / or for generating counter pressure.
  • a measuring device 16 is provided in the line 12, which may have, for example, a pressure detection device and / or a flow measuring device for determining the removal progress.
  • the second grinding station 4 for finishing calibration is constructed analogously to the first grinding station 1 and has, just like the latter, a pressure generating device 41, a line 42, a discharge device 43 and a measuring device 46 for removal fluid on, with the nature of the grinding media used in the two grinding stations 1 and 4 respectively.
  • the cleaning station 2 has a pressure generating device 21 for applying a cleaning fluid with pressure and a line 22 for supplying the cleaning fluid to the passage opening 7. Furthermore, an evacuation device 23 is provided below the through-opening 7, which can also serve for the treatment of the cleaning fluid. Accordingly, the second cleaning station 5 has a pressure generating device 51, a line 52 and a discharge device 53.
  • the flow-through test station 3 has a pressure-generating device 31 for applying test fluid at a pressure and a line 32 for supplying the test fluid from the pressure-generating device 31 to the through-opening 7. Downstream of the passage opening 7, in turn, a discharge device 33 is provided. In the course of the line 32, a measuring device 36 for detecting the pressure and / or the flow at the passage opening 7 is provided.
  • the second flow testing station 6 has, in an analogous manner, a pressure generating device 61, a line 62, a measuring device 66 and a discharge device 63.
  • the device according to the invention thus has two separate, self-contained grinding circuits, which are provided in the grinding stations 1 and 4. Furthermore, two separate cleaning circuits are given in the cleaning stations 2 and 5.
  • FIG. 1 A process flow diagram for explaining the method according to the invention is shown in FIG.
  • the component is subjected to a grinding step 70 in which a first ablation fluid is passed through the passage opening of the component.
  • a grinding step 70 the progress of the removal, in particular the flow rate at constant removal fluid pressure, is measured. If the removal progress, in particular the flow rate, reaches a predetermined value, for example 3% below a target value, the grinding step 70 is ended.
  • a cleaning step 71 is carried out, in which remaining removal fluid is removed from the passage opening. For this purpose, a cleaning fluid is passed through the passage opening.
  • the through-opening is then subjected to a flow-through test 72 in which a test fluid is passed through the through-opening, in which case, for example, the pressure and / or the flow of the test fluid at the through-opening is determined.
  • the passage opening of the component is already in the final value tolerance range, which can be, for example, ⁇ 0.5%. If this is the case, then the further-provided finished calibration step 75 is skipped and the passage opening is immediately cleaned in a further cleaning step 77. Finally, the passage opening is checked in a further flow test 78.
  • the size of the deviation from the final value tolerance is checked in step 74.
  • the subsequent finish calibration step 75 is timed, i. it will be canceled after a predetermined time. If the deviation is greater, then the subsequent finish calibration step 75 is "flow controlled, i.e., during the finish calibration step 75", the abrasive advance is determined based on flow measurements and processing is discontinued upon reaching a target flow value.
  • the components go through the cleaning step 77 and the final flow test 78.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

L'invention concerne un procédé pour usiner une ouverture de passage, en particulier dans un injecteur de carburant, selon lequel : au cours d'une étape de meulage, on dirige à travers l'ouverture de passage un fluide abrasif qui enlève de la matière; au cours d'une étape suivante de calibrage final, on dirige à travers l'ouverture de passage un autre fluide abrasif de nature différente, qui enlève de la matière. Selon l'invention, on effectue entre l'étape de meulage et l'étape de calibrage final un contrôle de débit, et on effectue l'étape de calibrage final en fonction du résultat du contrôle de débit, sachant qu'un mode de commande de l'étape de calibrage final est rendu dépendant du résultat du contrôle de débit et que la commande lors de l'étape de calibrage final s'effectue, selon le résultat du contrôle de débit, de manière commandée dans le temps ou progressive. L'invention concerne en outre un dispositif convenant pour la mise en oeuvre du procédé selon l'invention.
PCT/EP2008/000075 2007-03-01 2008-01-08 Procédé et dispositif pour usiner une ouverture de passage, en particulier dans un injecteur de carburant Ceased WO2008104243A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07004283.3 2007-03-01
EP20070004283 EP1964645B1 (fr) 2007-03-01 2007-03-01 Procédé et dispositif destinés au traitement d'une ouverture de passage, en particulier dans un injecteur de carburant

Publications (1)

Publication Number Publication Date
WO2008104243A1 true WO2008104243A1 (fr) 2008-09-04

Family

ID=38267651

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/000075 Ceased WO2008104243A1 (fr) 2007-03-01 2008-01-08 Procédé et dispositif pour usiner une ouverture de passage, en particulier dans un injecteur de carburant

Country Status (3)

Country Link
EP (1) EP1964645B1 (fr)
DE (1) DE502007001397D1 (fr)
WO (1) WO2008104243A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058296A1 (fr) * 1998-05-11 1999-11-18 Dynetics Corporation Systeme et procede de reglage de la taille et de la geometrie de surface d'un orifice
WO2004004973A1 (fr) * 2002-07-03 2004-01-15 Siemens Aktiengesellschaft Procede permettant d'arrondir, par erosion hydraulique, un bord d'un composant et utilisation de ce procede
EP1611995A1 (fr) * 2004-07-01 2006-01-04 Sonplas GmbH Procédé et dispositif pour éroder un orifice au moyen d'un fluide abrasif

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886697A (en) * 1969-09-17 1975-06-03 Edward George Feldcamp Methods for finishing an aperture
DE19758660B4 (de) * 1997-01-08 2004-01-22 Sonplas Gmbh Verfahren zur Einstellung des Brennstoffdurchflusses von Bauteilöffnungen für Einspritzventile
DE10151461A1 (de) * 2001-10-18 2003-05-08 Sonplas Gmbh Verfahren, Abrasivmedium und Vorrichtung zur Bearbeitung der Oberflächen eines Werkstücks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058296A1 (fr) * 1998-05-11 1999-11-18 Dynetics Corporation Systeme et procede de reglage de la taille et de la geometrie de surface d'un orifice
WO2004004973A1 (fr) * 2002-07-03 2004-01-15 Siemens Aktiengesellschaft Procede permettant d'arrondir, par erosion hydraulique, un bord d'un composant et utilisation de ce procede
EP1611995A1 (fr) * 2004-07-01 2006-01-04 Sonplas GmbH Procédé et dispositif pour éroder un orifice au moyen d'un fluide abrasif

Also Published As

Publication number Publication date
EP1964645B1 (fr) 2009-08-26
DE502007001397D1 (de) 2009-10-08
EP1964645A1 (fr) 2008-09-03

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