EP1572420A2 - Procedes d'usinage d'une arete d'un composant resistant aux pressions elevees, notamment procedes d'arrondissage hydro-erosif d'une arete, et dispositif correspondant - Google Patents

Procedes d'usinage d'une arete d'un composant resistant aux pressions elevees, notamment procedes d'arrondissage hydro-erosif d'une arete, et dispositif correspondant

Info

Publication number
EP1572420A2
EP1572420A2 EP03788869A EP03788869A EP1572420A2 EP 1572420 A2 EP1572420 A2 EP 1572420A2 EP 03788869 A EP03788869 A EP 03788869A EP 03788869 A EP03788869 A EP 03788869A EP 1572420 A2 EP1572420 A2 EP 1572420A2
Authority
EP
European Patent Office
Prior art keywords
edge
bore
pressure
liquid
hydro
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.)
Granted
Application number
EP03788869A
Other languages
German (de)
English (en)
Other versions
EP1572420B1 (fr
EP1572420B8 (fr
Inventor
Harald Schmidt
Stephan Aurich
Christoph Hamann
Maximilian Kronberger
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.)
Continental Automotive GmbH
Original Assignee
Volkswagen Mechatronic GmbH and Co KG
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 Volkswagen Mechatronic GmbH and Co KG filed Critical Volkswagen Mechatronic GmbH and Co KG
Publication of EP1572420A2 publication Critical patent/EP1572420A2/fr
Publication of EP1572420B1 publication Critical patent/EP1572420B1/fr
Application granted granted Critical
Publication of EP1572420B8 publication Critical patent/EP1572420B8/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
    • B24B39/02—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor designed for working internal surfaces of revolution
    • 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
    • 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
    • Y10T29/49405—Valve or choke making
    • 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
    • Y10T29/49405—Valve or choke making
    • Y10T29/49409—Valve seat forming
    • 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
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
    • Y10T29/49419—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including machining or drilling

Definitions

  • the invention relates to a method for machining an edge of a high-pressure-resistant component, in particular an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, in which the edge is hydro-erosively rounded in one processing step.
  • the invention also relates to a method for hydroerosively rounding an edge of a high-pressure-resistant component, in particular an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, in which a liquid mixed with abrasive bodies transversely over the edge to be rounded in the area of one of a first continuing bore is led to a branching second bore.
  • the invention also relates to a device for the hydro-erosive rounding of an edge of a high-pressure-resistant component, in particular an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, in which a liquid mixed with abrasive bodies crosses over the edge to be rounded in the region of a branch that branches off from a first further bore second hole is feasible.
  • a polymeric paste mixed with abrasive particles is pressed through the bores. Burrs are broken and the cut edges are rounded. Disadvantages are high running costs due to the purchase and disposal of the polymeric grinding paste as well as a very costly cleaning process to remove the grinding paste from the component.
  • edge is also rounded here in the area of the intersected holes.
  • a particular disadvantage here is the pore-like rough surface that occurs and the corrosive damage to the grain boundaries of the material, which lead to voltage peaks in the microscopic range. The pressure increase that can be achieved with this process is therefore lower than with the extrudehone process.
  • German patent application DE 199 53 131 AI discloses a method and a device for rounding edges in mechanically, thermally or otherwise highly stressed components.
  • the rounding of edges at intersections of channels in high-pressure accumulators of fuel injection systems is mentioned as a particular area of application.
  • stress peaks occur in the area of edges of all kinds, which can lead to component failure, in particular to a breakage of the component.
  • its edges are rounded.
  • the rounding takes place by flowing an erosive liquid over the edge to be rounded, which is conveyed through the component by a feed pump.
  • To increase the erosive effect of the liquid its flow velocity is increased over a cross-sectional taper in the area of the edge.
  • the flow rate of the liquid and thus also the material removal in the area of the edge can be influenced by adjusting the delivery pressure.
  • the delivery pressures are in the range of 50 bar to 140 bar.
  • the main direction of flow of the liquid and the longitudinal axis of the edge to be rounded preferably enclose an angle of 90 °.
  • Another device for hydro-erosively rounding an inlet edge of a spray hole in an injection nozzle for fuel is also known from German patent DE 199 14 719 C2.
  • a flow body is provided here which is modeled on the shape of a nozzle needle.
  • guide grooves extending in the longitudinal direction thereof can be incorporated in the outer wall of the tip of the nozzle-needle-shaped flow body, via which the abrasive abrasive bodies of the erosive liquid target the upper region of the inlet edge of the
  • Spray hole can be directed. This is intended to achieve an increased rounding in this area, which should then lead to a higher fuel flow rate.
  • the present invention is based on the object of a method for machining an edge of a high-pressure-resistant component, in particular an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, and a method and a device for hydro-erosively rounding an edge of a high-pressure-resistant component, in particular one To create an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, with each of which an optimization of the rounding result and thus an optimization of the high-pressure strength of the component is achieved.
  • This task is accomplished through a procedure for editing a
  • Edge of a high-pressure-resistant component with the features of claim 1 solved and by a method for hydro-erosive rounding an edge of a high-pressure-resistant component with the features of claim 4.
  • this task becomes solved by a device with the features of claim 7.
  • Advantageous refinements of the method and the device are specified in subclaims 2, 3, 5, 6 and 8.
  • a further improvement in the high-pressure strength of the component is achieved in that before Processing step of hydroerosive rounding of the edge and the surfaces of the high-pressure-resistant component adjoining the edge are each placed under compressive stresses in the area of their surface by means of a grinding and / or honing process.
  • a more or less pronounced burr arises on the edge.
  • the essence of the present invention lies in the combination of the processing step of grinding and / or honing to generate compressive stresses in the edge and the adjacent surface of the high-pressure-resistant component with the subsequent processing step of hydroerosive rounding.
  • the desired degree of rounding corresponds to the optimum strength.
  • the compressive stresses generated in the edge and in the adjacent surface of the high-pressure-resistant component are advantageously the tensile stresses caused by the under high pressure standing fuel are generated, directed in the opposite direction.
  • the edge is deburred and smoothed by the hydro-erosive rounding of the edge, thus defusing the triaxial stress state typical of burrs and sharp edges.
  • the edge and the surfaces adjacent to the edge, preferably cylindrical surfaces of bores, of the high-pressure-resistant component are each in the area of their surface by means of the grinding and / or honing process under compressive stresses in a range of 500 N / mm2 to 1500 N / mm2 set.
  • the edge is only rounded to such an extent that a maximum of 10 ⁇ m to 50 ⁇ m is removed, so that compressive stresses of at least 200 N / mm 2 are retained. This roughly corresponds to rounding radii from 30 ⁇ m to 170 ⁇ m.
  • a method and the corresponding device for hydro-erosively rounding an edge of a high-pressure-resistant component in particular an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, in which a liquid mixed with abrasive bodies crosses over the edge to be rounded in the area of one of one the first continuing bore is guided to a branching second bore, an optimal rounding result in the area of the edge is achieved, that the deflection of the liquid mixed with grinding wheels from the first further bore into the second branching hole seen in the main flow direction of the liquid mixed with grinding wheels, the first hole behind the branching second hole is closed with a closure element.
  • This backflow in connection with the dynamic pressure zone has the effect that the flow in the region of the part of the edge facing away from the inlet of the liquid containing the grinding wheels into the bore, which is also referred to as the opposite edge, does not break off and can therefore be rounded hydro-erosively ,
  • the closure element is inserted into the continuing first bore in the main flow direction of the liquid mixed with grinding wheels behind the branching second bore at a distance of approximately 0.5 mm to 10 mm. In this way an optimal rounding of the inflow and the opposite edge is achieved.
  • a further improvement in the rounding result is achieved in that the main flow direction of the liquid mixed with grinding bodies is changed in the first bore at least once, preferably several times.
  • the main flow direction is reversed and thus the inflow edge to the opposite edge and the opposite edge to the inflow edge. Differences in the degree of rounding on the opposite edge and on the inflow edge can thus be compensated for.
  • the present invention is explained in more detail below on the basis of an exemplary embodiment shown in a drawing.
  • the single FIGURE shows a schematic sectional view of a detail of a high-pressure-resistant component 1 of a fuel injection system, such as an injection nozzle, an injector body, a forging nails, a welding rail, a displacement unit of a high pressure common rail pump or the high pressure area of a common rail high pressure pump ,
  • the component 1 has a main channel and a branch channel, which are designed in the form of a first cylindrical bore 2 and a second cylindrical bore 3.
  • the second bore 3 branches off from the first bore 2 in the region of the inner wall 4 of the first bore 2.
  • a peripheral edge 5 is formed in the component 1, which is sharp-edged after the bores 2 and 3 have been produced.
  • the longitudinal axes L, 1 of the two bores 2 and 3 run at a right angle to one another and the branch region thereby created is T-shaped.
  • the edge 5 is hydro-erosively rounded to increase the high-pressure strength of the component 1.
  • a liquid 8 mixed with abrasive bodies 7, preferably a highly viscous lubricating oil is introduced into the first bore 2 by means of a feed pump, not shown, and is guided across the edge 5 to be rounded.
  • Cross here means any flow at an angle to the circumferential edge.
  • the liquid 8 with the grinding bodies 7 is seen in the bore 2 in the main flow direction S, which coincides with the longitudinal axis L of the first bore 2 -
  • the bore 2 which continues as a through bore or at least in relation to the branching bore 3, is sealed pressure-tight by a closure element 9, shown schematically in the single figure, in the form of an inserted plug.
  • the distance a between the closure surface of the closure element 9 and the rear counter edge 11 of the bore 3 - viewed in the main flow direction S or in the direction of the longitudinal axis L of the bore 2 - is approximately 0.5 to 10 mm.
  • the flow of the liquid 8 with the abrasive particles 7 is changed such that a back pressure zone is formed in the region of the distance a from the bore 2 and thus in front of the closure element 9, which zone in a deflection area U in front of the closure element 9 to deflect the Liquid 8 with the grinding wheels 7 leads.
  • a backflow occurs in the direction R, so that the edge 5 and the adjoining bore 3 from both directions - the main flow direction S and the backflow direction R - is flowed through.
  • the backflow direction R is opposite to the main flow direction S in the region adjacent to the closure element 9 and is deflected in the branch region of the second bore 3 in the direction of the longitudinal axis 1 of the second bore 3.
  • the counter edge 11 - has a more advantageous flow around it than without the closure element 9. Good rounding results are achieved accordingly.
  • the section of the edge 5 which is referred to as the inflow edge 10 and which faces the inflow of the liquid 8 with the abrasive particles 7 or faces away from the closure element 9 is also rounded sufficiently.
  • the invention also applies at high initial pressures - for example, due to the transition from a 4 mm bore 2 to a 2 mm bore 3 - from about 50 bar a very low separation of the flow in the
  • the edges 5 with a radius r between 30 ⁇ m and 170 ⁇ m, preferably 50 ⁇ m and 100 ⁇ m, are rounded off by the hydro-erosive rounding, so that the compressive stress in the inner wall 4, 6 of the bores 2, 3 in the area of the edge 5 is still above 200 N / mm 2 , preferably above 700 N / mm 2 .
  • the maximum material removal due to the hydro-erosive rounding is in the range from 10 ⁇ m to 50 ⁇ m, preferably 20 ⁇ m to 40 ⁇ m.
  • an increase in the flow rate is associated with an increase in the erosive effect of the liquid 8 mixed with the grinding bodies 7.
  • the hydro-erosive ver rounding is carried out at pressures in the range of approximately 10 bar to 500 bar.
  • the liquid 8 with the grinding bodies 7 leaves the component 1 via the second bore 3, the end of which is connected to a return line (not shown).
  • the bore 2 has a diameter D that is slightly larger than the diameter d of the branching bore 3.
  • the diameters D, d of the bores are in the usual way in a range of 0.5 mm to 10 mm, preferably in the range of about 2 mm to 4 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

La présente invention concerne des procédés d'usinage d'un composant résistant aux pressions élevées, selon lesquels l'arête est arrondie de façon hydro-érosive en une étape, ainsi qu'un procédé et un dispositif d'arrondissage hydro-érosif d'une arête d'un composant résistant aux pressions élevées, notamment de l'arête d'une intersection d'alésages d'un composant résistant aux pressions élevées d'un moteur à combustion interne. Selon l'invention, un liquide pourvu de corps abrasifs est guidé transversalement sur l'arête à arrondir, dans la zone de ramification d'un premier alésage vers un deuxième alésage. L'invention vise à optimiser l'arrondissage et donc la résistance aux pressions élevées du composant. A cet effet, l'arête (5) et les surfaces adjacentes (4, 6) du composant (1) sont mises sous pression par l'intermédiaire d'un procédé d'abrasion et/ou de pierrage avant arrondissage hydro-érosif. Par ailleurs, pour dévier le liquide (8) pourvu de corps abrasifs, du premier alésage (2) vers le deuxième (3), un élément de fermeture (9) est introduit dans le premier alésage (2), dans le sens d'écoulement principal (S) du liquide, en aval de la ramification vers le deuxième alésage (3).
EP03788869A 2002-12-20 2003-12-10 Procedes d'usinage d'une arete d'un composant resistant aux pressions elevees, notamment procedes d'arrondissage hydro-erosif d'une arete, et dispositif correspondant Expired - Lifetime EP1572420B8 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10260302A DE10260302A1 (de) 2002-12-20 2002-12-20 Verfahren zum Bearbeiten einer Kante eines hochdruckfesten Bauteils , insbesondere zum hydro-erosiven Verrunden einer Kante sowie und Vorrichtung hierzu
DE10260302 2002-12-20
PCT/DE2003/004063 WO2004056530A2 (fr) 2002-12-20 2003-12-10 Procedes d'usinage d'une arete d'un composant resistant aux pressions elevees, notamment procedes d'arrondissage hydro-erosif d'une arete, et dispositif correspondant

Publications (3)

Publication Number Publication Date
EP1572420A2 true EP1572420A2 (fr) 2005-09-14
EP1572420B1 EP1572420B1 (fr) 2008-02-27
EP1572420B8 EP1572420B8 (fr) 2008-05-07

Family

ID=32519258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03788869A Expired - Lifetime EP1572420B8 (fr) 2002-12-20 2003-12-10 Procedes d'usinage d'une arete d'un composant resistant aux pressions elevees, notamment procedes d'arrondissage hydro-erosif d'une arete, et dispositif correspondant

Country Status (5)

Country Link
US (1) US7637800B2 (fr)
EP (1) EP1572420B8 (fr)
JP (1) JP2006509644A (fr)
DE (2) DE10260302A1 (fr)
WO (1) WO2004056530A2 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE102005026511A1 (de) * 2005-06-09 2006-12-14 Robert Bosch Gmbh Ventil, insbesondere zur Verwendung als Saugventil auf der Saugseite von Kraftstoffeinspritzsystemen
JP4484227B2 (ja) * 2006-10-02 2010-06-16 ボッシュ株式会社 コモンレール
US8187056B2 (en) * 2006-12-14 2012-05-29 Flow International Corporation Process and apparatus for surface-finishing
DE102010007704A1 (de) 2010-02-11 2011-08-11 Daimler AG, 70327 Vorrichtung zum Bearbeiten eines rotationssymmetrischen Hohlraumes eines druckfesten Bauteiles
US9676045B2 (en) 2011-02-28 2017-06-13 Corning Optical Communications Rf Llc Electrodes, components, apparatuses, and methods for burr-free or substantially burr-free electrochemical machining
DE102015009153A1 (de) * 2015-07-14 2017-01-19 Liebherr-Aerospace Lindenberg Gmbh Herstellungsverfahren eines Leitungsbauteils
US10646977B2 (en) * 2016-06-17 2020-05-12 United Technologies Corporation Abrasive flow machining method

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US5054247A (en) * 1986-03-21 1991-10-08 Extrude Hone Corporation Method of controlling flow resistance in fluid orifice manufacture
US5076027A (en) * 1987-12-17 1991-12-31 Extrude Hone Corporation Process for abrasive flow machining using multiple cylinders
US5195276A (en) * 1991-02-15 1993-03-23 Outboard Marine Corporation Apparatus and method for flushing a casting
DE19757117A1 (de) * 1997-12-20 1999-06-24 Bosch Gmbh Robert Verfahren zur Herstellung eines Ventilsitzkörpers für ein Brennstoffeinspritzventil und Brennstoffeinspritzventil
DE19902423A1 (de) * 1999-01-22 2000-08-03 Bosch Gmbh Robert Vorrichtung und Verfahren zur Bearbeitung einer Innenoberfläche
DE19953131A1 (de) * 1999-11-04 2001-08-02 Bosch Gmbh Robert Verfahren und Vorrichtung zum Kantenverrunden
US6503126B1 (en) * 2000-09-12 2003-01-07 Extrude Hone Corporation Method and apparatus for abrading the region of intersection between a branch outlet and a passageway in a body
JP2002103200A (ja) * 2000-09-28 2002-04-09 Tooyoo:Kk ホーニング工具
US6739956B2 (en) * 2001-10-30 2004-05-25 Valiant Corporation Apparatus for cleaning engine block passages
JP3681714B2 (ja) * 2002-06-18 2005-08-10 株式会社不二精機製造所 部材内部の長孔交差部のブラスト加工方法

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See references of WO2004056530A2 *

Also Published As

Publication number Publication date
US7637800B2 (en) 2009-12-29
DE50309277D1 (de) 2008-04-10
EP1572420B1 (fr) 2008-02-27
WO2004056530A3 (fr) 2004-08-26
US20060010688A1 (en) 2006-01-19
WO2004056530A8 (fr) 2004-10-21
WO2004056530A2 (fr) 2004-07-08
DE10260302A1 (de) 2004-07-15
EP1572420B8 (fr) 2008-05-07
JP2006509644A (ja) 2006-03-23

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