EP1124665B1 - Method for calibrating throttle bores, especially in injection valves for internal combustion engines, and device for carrying out said method - Google Patents

Method for calibrating throttle bores, especially in injection valves for internal combustion engines, and device for carrying out said method Download PDF

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Publication number
EP1124665B1
EP1124665B1 EP00971229A EP00971229A EP1124665B1 EP 1124665 B1 EP1124665 B1 EP 1124665B1 EP 00971229 A EP00971229 A EP 00971229A EP 00971229 A EP00971229 A EP 00971229A EP 1124665 B1 EP1124665 B1 EP 1124665B1
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EP
European Patent Office
Prior art keywords
liquid
throttle bore
line
machining
flow
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.)
Revoked
Application number
EP00971229A
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German (de)
French (fr)
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EP1124665A1 (en
Inventor
Juergen Schubert
Friedrich Weis
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1124665A1 publication Critical patent/EP1124665A1/en
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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 according to the preamble of the claim 1 and on an apparatus for performing the method according to the preamble of Claim 5, such as known from US-A-5 807 163, which represents the closest state of the art.
  • the object of the invention is to calibrate throttle bores improve that a reduction in the spread of the cavitation-free flow is achieved becomes.
  • the object is achieved in a method as described in the introduction Genus or in a device for performing this method by characterizing measures of claim 1 and claim 5 solved.
  • the invention enables cavitation-free calibration of the throttle bore, since the back pressure on the downstream side reduces the pressure drop accordingly and this prevents the formation of gas bubbles in the processing liquid. Otherwise, the erosive grinding of the throttle bore can be carried out in a conventional manner Way (e.g. using the HE method).
  • the method according to the invention can thus be used to scatter the cavitation-free Flow compared to other preprocessing processes (e.g. drilling or eroding) from approximately +/- 3% to approximately +/- 0.6%.
  • preprocessing processes e.g. drilling or eroding
  • a workpiece e.g. a component from an injector of an injection system for internal combustion engines, with a through erosive machining using liquid calibrating throttle bore 11.
  • the upstream side of the workpiece 10 or Throttle bore 11 is located at 12, the outflow side at 13, which is a Flow direction of the liquid processing the throttle bore 11 in the direction of arrow 14 results.
  • the processing initially contained in a tank 15 Liquid, preferably a mineral oil with a viscosity of about 2 cSt and one Temperature of about 40 ° C, pumped by a pump 16 into a line system 17 and brought to a suitable processing pressure (e.g. about 100 bar).
  • a suitable processing pressure e.g. about 100 bar.
  • a bubble or Membrane accumulator 18 compensates for any fluctuations in the delivery pressure Pump 16.
  • the liquid flows through a flow measuring system 19, which continuously feeds its measurement results into a computer 20. Also in the Computer 20 entered the pressure and temperature of the liquid at 21 and 22nd be tapped. The computer controls - via a pump drive motor 23 - on the one hand the pump 16, on the other hand, a shut-off valve 24. In the flow measuring system 19th the actual flow rate is measured and a constant comparison is made in the computer with a given target flow. When the flow difference approaches zero goes off, the shut-off valve closes 24. This results in the inlet of the throttle bore 11 (at 12) an exactly regulated flow.
  • an aperture 28 is arranged, one Counter pressure builds up.
  • the back pressure can be checked on a pressure sensor 26.
  • Throttle bore 11 Due to the back pressure caused by the orifice 28 on the outflow side of the Throttle bore 11 is prevented that the during processing (calibration) Throttle bore 11 occurs in the liquid cavitation.
  • FIG. 2 differs from the embodiment according to FIG. 1 in that that instead of the aperture 28 (Fig. 1), a bubble or membrane accumulator 30 for generation back pressure is provided.
  • the bladder or membrane storage 30 is via a Branch line 31 connected to the discharge line 27.
  • a shut-off valve 32 in the outflow line 27.
  • the shut-off valve 32 is closed for the duration of the grinding process. To Completion of the grinding process is the amount that is caused by the during the grinding process Throttle bore 11 of the workpiece 10 was conveyed through the shut-off valve 32 drained.

Description

Die Erfindung bezieht sich auf ein Verfahren nach dem Oberbegriff des Patentanspruchs 1 und auf eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Patentanspruchs 5, wie z.B. bekannt aus der Druckschrift US-A- 5 807 163, welche den nächstkommenden Stand des Technik darstellt.The invention relates to a method according to the preamble of the claim 1 and on an apparatus for performing the method according to the preamble of Claim 5, such as known from US-A-5 807 163, which represents the closest state of the art.

Es ist bekannt, Drosselbohrungen der in Rede stehenden Art durch Suspensionen, z.B. bestehend aus einem mineralischen Öl geeigneter Viskosität und einem Schleifkornanteil hydroerosiv zu bearbeiten und hierbei im Hinblick auf den im (späteren) Betrieb des betreffenden Werkstücks gewünschten Durchfluß zu kalibrieren (sog. HE-Verfahren). Da der Bearbeitungsdruck der Flüssigkeit am Ausgang der Drosselbohrung abfällt, entsteht in der Flüssigkeit Kavitation, die zu einer unerwünschten Streuung des kavitationsfreien Durchflusses der Drosselbohrung führt.It is known to cut throttle bores of the type in question by suspensions, e.g. consisting of a mineral oil of suitable viscosity and an abrasive grain content hydroerosive to process and with regard to the (later) operation of the calibrate the desired flow rate of the workpiece concerned (so-called HE method). Since the processing pressure of the liquid drops at the outlet of the throttle bore, Cavitation occurs in the liquid, which leads to an undesirable scattering of the cavitation-free flow of the throttle bore leads.

Der Erfindung liegt die Aufgabe zugrunde, die Kalibrierung von Drosselbohrungen so zu verbessern, daß eine Verringerung der Streuung des kavitationsfreien Durchflusses erzielt wird.The object of the invention is to calibrate throttle bores improve that a reduction in the spread of the cavitation-free flow is achieved becomes.

Vorteile der ErfindungAdvantages of the invention

Erfindungsgemäß wird die Aufgabe bei einem Verfahren der eingangs bezeichneten Gattung bzw. bei einer Vorrichtung zur Durchführung dieses Verfahrens durch die kennzeichnenden Maßnahmen des Patentanspruchs 1 bzw. des Patentanspruchs 5 gelöst. According to the invention, the object is achieved in a method as described in the introduction Genus or in a device for performing this method by characterizing measures of claim 1 and claim 5 solved.

Die Erfindung ermöglicht eine kavitationsfreie Kalibrierung der Drosselbohrung, da der Gegendruck auf der Abströmseite den Druckabfall entsprechend verringert und dadurch die Bildung von Gasblasen in der Bearbeitungsflüssigkeit unterbindet. Im übrigen kann die erosive Schleifbearbeitung der Drosselbohrung in herkömmlicher Weise (z.B. nach dem HE-Verfahren) erfolgen.The invention enables cavitation-free calibration of the throttle bore, since the back pressure on the downstream side reduces the pressure drop accordingly and this prevents the formation of gas bubbles in the processing liquid. Otherwise, the erosive grinding of the throttle bore can be carried out in a conventional manner Way (e.g. using the HE method).

Durch das erfindungsgemäße Verfahren läßt sich somit die Streuung des kavitationsfreien Durchflusses gegenüber anderen Vorbearbeitungsverfahren (z.B. Bohren oder Erodieren) von bisher etwa +/- 3% auf ca. +/- 0,6% reduzieren.The method according to the invention can thus be used to scatter the cavitation-free Flow compared to other preprocessing processes (e.g. drilling or eroding) from approximately +/- 3% to approximately +/- 0.6%.

Vorteilhafte Weiterbildungen des verfahrensmäßigen Teils der Erfindung können den Patentansprüchen 2 - 4 entnommen werden. Ausgestaltungen des gegenständlichen Teils der Erfindung enthalten die Patentansprüche 6 und 7.Advantageous developments of the procedural part of the invention can Claims 2-4 can be found. Refinements of the part in question the invention contain claims 6 and 7.

Zeichnungendrawings

Die Erfindung läßt sich durch diverse Ausführungsbeispiele realisieren. Zwei davon sind zeichnerisch dargestellt und im folgenden detailliert erläutert. Es zeigt (jeweils in schematischer Blockschaltbilddarstellung) :

Fig. 1
Eine Ausführungsform einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens, mit der zu kalibrierenden Drosselbohrung vorgeschaltetem Durchflußmeßsystem, und
Fig. 2
eine Abwandlung der aus Fig. 1 ersichtlichen Vorrichtung.
The invention can be implemented by means of various exemplary embodiments. Two of them are shown in the drawing and explained in detail below. It shows (each in a schematic block diagram representation):
Fig. 1
An embodiment of an apparatus for performing the method according to the invention, with the flow measuring system connected upstream of the throttle bore, and
Fig. 2
a modification of the device shown in FIG. 1.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Es bezeichnet 10 ein Werkstück, z.B. ein Bauteil aus einem Injektor einer Einspritzanlage für Brennkraftmaschinen, mit einer durch erosive Bearbeitung mittels Flüssigkeit zu kalibrierenden Drosselbohrung 11. Die Anströmseite des Werkstücks 10 bzw. der Drosselbohrung 11 befindet sich bei 12, die Abströmseite bei 13, woraus sich eine Strömungsrichtung der die Drosselbohrung 11 bearbeitenden Flüssigkeit in Pfeilrichtung 14 ergibt. It denotes 10 a workpiece, e.g. a component from an injector of an injection system for internal combustion engines, with a through erosive machining using liquid calibrating throttle bore 11. The upstream side of the workpiece 10 or Throttle bore 11 is located at 12, the outflow side at 13, which is a Flow direction of the liquid processing the throttle bore 11 in the direction of arrow 14 results.

Wie aus Fig. 1 ersichtlich ist, wird die bearbeitende, zunächst in einem Tank 15 enthaltende Flüssigkeit, vorzugsweise ein mineralisches Öl mit einer Viskosität von etwa 2 cSt und einer Temperatur von ca. 40° C, durch eine Pumpe 16 in ein Leitungssystem 17 gepumpt und auf einen geeigneten Bearbeitungsdruck (z.B. etwa 100 bar) gebracht. Ein Blasen- oder Membranspeicher 18 sorgt für einen Ausgleich etwaiger Förderdruckschwankungen der Pumpe 16.As can be seen from Fig. 1, the processing, initially contained in a tank 15 Liquid, preferably a mineral oil with a viscosity of about 2 cSt and one Temperature of about 40 ° C, pumped by a pump 16 into a line system 17 and brought to a suitable processing pressure (e.g. about 100 bar). A bubble or Membrane accumulator 18 compensates for any fluctuations in the delivery pressure Pump 16.

Auf seinem Weg zum Werkstück 10 durchströmt die Flüssigkeit ein Durchflußmeßsystem 19, das seine Meßergebnisse ständig in einen Rechner 20 einspeist. Ebenfalls in den Rechner 20 eingegeben werden Druck und Temperatur der Flüssigkeit, die bei 21, bzw. 22 abgegriffen werden. Der Rechner steuert - über einen Pumpen-Antriebsmotor 23 - einerseits die Pumpe 16, andererseits einen Absperrhahn 24 an. In dem Durchflußmeßsystem 19 wird also der jeweilige Ist-Durchfluß gemessen, und im Rechner erfolgt ein ständiger Vergleich mit einem vorgegebenen Soll-Durchfluß. Wenn die Durchflußdifferenz gegen Null geht, schließt der Absperrhahn 24. Auf diese Weise ergibt sich am Eingang der Drosselbohrung 11 (bei 12) ein exakt geregelter Durchfluss.On its way to the workpiece 10, the liquid flows through a flow measuring system 19, which continuously feeds its measurement results into a computer 20. Also in the Computer 20 entered the pressure and temperature of the liquid at 21 and 22nd be tapped. The computer controls - via a pump drive motor 23 - on the one hand the pump 16, on the other hand, a shut-off valve 24. In the flow measuring system 19th the actual flow rate is measured and a constant comparison is made in the computer with a given target flow. When the flow difference approaches zero goes off, the shut-off valve closes 24. This results in the inlet of the throttle bore 11 (at 12) an exactly regulated flow.

Auf der Abströmseite 13 der Drosselbohrung 11 ist eine Blende 28 angeordnet, die einen Gegendruck aufbaut. An einem Druckaufnehmer 26 kann der Gegendruck überprüft werden.On the outflow side 13 of the throttle bore 11, an aperture 28 is arranged, one Counter pressure builds up. The back pressure can be checked on a pressure sensor 26.

Durch den mittels der Blende 28 bewirkten Gegendruck auf der Abströmseite der Drosselborung 11 wird verhindert, daß während der Bearbeitung (Kalibrierung) der Drosselbohrung 11 in der Flüssigkeit Kavitation auftritt.Due to the back pressure caused by the orifice 28 on the outflow side of the Throttle bore 11 is prevented that the during processing (calibration) Throttle bore 11 occurs in the liquid cavitation.

Nach Durchströmen der - zu bearbeitenden - Drosselbohrung 11 und der Blende 28 gelangt die Flüssigkeit schließlich in den Sammelbehälter 15. After flowing through the - to be machined - throttle bore 11 and the orifice 28 finally the liquid into the collecting container 15.

Die Variante nach Fig. 2 unterscheidet sich von der Ausführungsform nach Fig. 1 dadurch, daß anstelle der Blende 28 (Fig. 1) ein Blasen- oder Membranspeicher 30 zur Erzeugung eines Gegendruckes vorgesehen ist. Der Blasen- oder Membranspeicher 30 ist über eine Zweigleitung 31 mit der Abströmleitung 27 verbunden .Im Anschluß an den Blasenoder Membranspeicher 30 ist in der Abströmleitung 27 ein Absperrhahn 32 angeordnet.The variant according to FIG. 2 differs from the embodiment according to FIG. 1 in that that instead of the aperture 28 (Fig. 1), a bubble or membrane accumulator 30 for generation back pressure is provided. The bladder or membrane storage 30 is via a Branch line 31 connected to the discharge line 27. Following the bubbles or Membrane accumulator 30 has a shut-off valve 32 in the outflow line 27.

Während der Dauer des Schleifvorganges ist der Absperrhahn 32 geschlossen. Nach Abschluß des Schleifvorganges wird die Menge, die während des Schleifvorganges durch die Drosselbohrung 11 des Werkstücks 10 hindurchgefördert wurde, über den Absperrhahn 32 abgelassen.The shut-off valve 32 is closed for the duration of the grinding process. To Completion of the grinding process is the amount that is caused by the during the grinding process Throttle bore 11 of the workpiece 10 was conveyed through the shut-off valve 32 drained.

Claims (7)

  1. Method for calibrating throttle bores, in particular in injection valves for internal combustion engines, by hydroerosive machining of the throttle bore by means of a liquid, the actual throughput being compared with a predetermined desired throughput and the hydroerosive machining being terminated when the actual throughput and desired throughput coincide, characterized in that a counterpressure preventing the cavitation of the liquid is built up on the outflow side (13) of the throttle bore (11).
  2. Method according to Claim 1, characterized in that the counterpressure is 60 bar or essentially 60 bar.
  3. Method according to Claim 1 or 2, characterized in that viscosity and temperature of the machining liquid are selected in such a manner that they correspond to the conditions of the subsequent test.
  4. Method according to Claim 3, characterized in that the viscosity of the machining liquid is 2.5 cSt and the temperature is 40ºC.
  5. Device for carrying out the method according to one or more of the preceding claims, a flow-measuring device (19) being arranged on the inflow side (12) of the throttle bore (11) to be calibrated, the flow-measuring device being connected to a computer (20) for the purpose of regulating the flow quantity, characterized in that a liquid line (27) is connected on the outflow side (13) of the throttle bore (11) and an aperture (28) producing the counterpressure is arranged in it.
  6. Device according to Claim 5, characterized in that the aperture (28) is arranged in the liquid line (27) after the junction of a branch line (25) leading to a pressure sensor (26).
  7. Device according to Claim 5, characterized in that, following the junction of the branch line (25), a further branch line (31), which is connected to a bubble or membrane store (30), leads into the liquid line (27), and in that, following the junction point of the further branch line (31), a liquid valve (32) is arranged in the liquid line (27).
EP00971229A 1999-09-01 2000-08-18 Method for calibrating throttle bores, especially in injection valves for internal combustion engines, and device for carrying out said method Revoked EP1124665B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19941472 1999-09-01
DE19941472A DE19941472A1 (en) 1999-09-01 1999-09-01 Method for the calibration of throttle bores, in particular in injection valves for internal combustion engines, and device for carrying out the method
PCT/DE2000/002822 WO2001015859A1 (en) 1999-09-01 2000-08-18 Method for calibrating throttle bores, especially in injection valves for internal combustion engines, and device for carrying out said method

Publications (2)

Publication Number Publication Date
EP1124665A1 EP1124665A1 (en) 2001-08-22
EP1124665B1 true EP1124665B1 (en) 2004-05-06

Family

ID=7920301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00971229A Revoked EP1124665B1 (en) 1999-09-01 2000-08-18 Method for calibrating throttle bores, especially in injection valves for internal combustion engines, and device for carrying out said method

Country Status (5)

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US (1) US6575815B1 (en)
EP (1) EP1124665B1 (en)
JP (1) JP2003508236A (en)
DE (2) DE19941472A1 (en)
WO (1) WO2001015859A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004004973A1 (en) * 2002-07-03 2004-01-15 Siemens Aktiengesellschaft Method for the hydro-erosive rounding of an edge of a part and use thereof
US20050127205A1 (en) * 2002-07-04 2005-06-16 Siemens Aktiengesellschaft Method and device for the hydro-erosive rounding of an edge of a component
DE10255514A1 (en) * 2002-11-27 2004-06-09 Endress + Hauser Gmbh + Co. Kg Pressure control process to avoid cavitation in a process plant
DE102004019356B3 (en) * 2004-04-21 2005-09-29 Sonplas Gmbh Machining process for through aperture involves first setting counter pressure same as grinding pressure and then setting pressure difference
DE102004027145B3 (en) * 2004-06-03 2006-08-03 Siemens Ag Method for adjusting the flow through at least one bore of a workpiece
US7427227B2 (en) 2005-08-30 2008-09-23 Denso Corporation Method and apparatus for fluid polishing
DE102005055422A1 (en) * 2005-11-21 2007-05-24 Sonplas Gmbh Arrangement and method for processing passage openings using a fluid
JP4569462B2 (en) * 2005-12-19 2010-10-27 株式会社デンソー Fluid polishing method and apparatus
CA2805461C (en) * 2012-02-13 2015-05-26 Marco Group International, Inc. Blast machine system controller

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60119363A (en) * 1983-11-30 1985-06-26 Keihin Seiki Mfg Co Ltd Fuel injection valve
US5054247A (en) * 1986-03-21 1991-10-08 Extrude Hone Corporation Method of controlling flow resistance in fluid orifice manufacture
DE69627507T2 (en) * 1995-08-04 2003-11-06 Dynetics Llc Woburn METHOD AND DEVICE FOR PROCESSING AN OPENING BY MEANS OF AN ABRASIVE LIQUID
US6306011B1 (en) * 1998-05-11 2001-10-23 Dynetics Corporation System for controlling the size and surface geometry of an orifice

Also Published As

Publication number Publication date
DE50006321D1 (en) 2004-06-09
WO2001015859A1 (en) 2001-03-08
JP2003508236A (en) 2003-03-04
US6575815B1 (en) 2003-06-10
DE19941472A1 (en) 2001-03-15
EP1124665A1 (en) 2001-08-22

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