EP1423237A2 - Method for the production of a high-pressure fuel accumulator - Google Patents

Method for the production of a high-pressure fuel accumulator

Info

Publication number
EP1423237A2
EP1423237A2 EP02769909A EP02769909A EP1423237A2 EP 1423237 A2 EP1423237 A2 EP 1423237A2 EP 02769909 A EP02769909 A EP 02769909A EP 02769909 A EP02769909 A EP 02769909A EP 1423237 A2 EP1423237 A2 EP 1423237A2
Authority
EP
European Patent Office
Prior art keywords
pressure
lance
pressure accumulator
accumulator
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02769909A
Other languages
German (de)
French (fr)
Inventor
Christian Taudt
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1423237A2 publication Critical patent/EP1423237A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/083—Deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • Y10T29/47—Burnishing
    • Y10T29/479—Burnishing by shot peening or blasting

Definitions

  • the invention relates to a method for producing a high-pressure fuel accumulator according to the independent claim.
  • High-pressure fuel accumulators are used in particular in diesel engines with so-called common rail systems.
  • the fuel is compressed to a pressure of more than 1000 to more than 2000 bar using a high-pressure pump and fed to the high-pressure fuel reservoir. From this pressure lines lead to the injectors of the individual combustion chambers of the internal combustion engine.
  • the high-pressure fuel reservoir is subject to a considerable mechanical load at the prevailing pressures, which also fluctuates greatly during operation.
  • the object of the invention is to provide a method for increasing the pressure resistance of a high-pressure fuel accumulator, which avoids the disadvantages in the prior art and which enables an optimized blasting effect of the inner cutting edges.
  • This object is achieved with a method according to independent claim 1.
  • a method according to the invention for producing a high-pressure fuel accumulator of an internal combustion engine with a storage injection system, in particular a diesel internal combustion engine with a common rail injection system, in which branchings for connecting pressure lines are introduced into the latter after the production of a hollow pressure accumulator from metal in which branchings for connecting pressure lines are introduced into the latter after the production of a hollow pressure accumulator from metal, the Inner bore and in particular the vulnerable branches on their inner edges leading to a cavity of the pressure accumulator are treated by means of a shot peening process. As a result, residual compressive stresses are introduced into the material. The formation of radii is the result of such a treatment.
  • each inner edge of each branch is blasted one after the other in both directions of the course of the cavity of the pressure accumulator, the lance being directed against and / or in the jet direction.
  • This method according to the invention has the advantage that the rounding of the inner edges of the branches in the high-pressure accumulator can be produced much more uniformly and with a constant radius.
  • the radiation in both longitudinal directions of the cavity of the pressure accumulator leads to a constant treatment along the entire inner edge of each branch.
  • the lance which runs longitudinally against the jet direction of the balls, serves to deflect the balls in the direction of the walls of the inner bore of the pressure accumulator. Irradiation in two directions accordingly leads to a constant rounding depending on the duration of the irradiation.
  • the radiance of the sides ensures that the inside edges are treated evenly on all sides.
  • rounded jet grain is used, i.e. a blasting material of defined ball size and defined ball hardness. Shot peening with such blasting material ensures precisely reproducible dimensions and properties of the high-pressure accumulator, even when processing large batches.
  • the high-pressure accumulator can be made from a structural steel, a case-hardening steel, a tempering steel or also from a stainless steel.
  • a preferred embodiment of the invention provides that the high-pressure accumulator is made of forged steel, which has a particularly high strength and toughness under the changing pressure loads that occur.
  • the steels mentioned can all be strengthened by shot peening to such an extent that the inner surface is compacted and thus a notch effect is significantly reduced.
  • a preferred embodiment of the invention provides that the lance is guided centrally in the pressure accumulator.
  • the central guidance of the essentially cylindrical lance in the likewise cylindrical inner cavity of the pressure accumulator leads to a largely uniform solidification of the inner surface of the pressure accumulator due to the cone tip of the lance.
  • the central guidance can preferably be ensured in that the lance has at least three support elements which are evenly distributed on the cylindrical circumference and which can slide along the longitudinal direction in the cavity of the pressure accumulator.
  • FIG. 1 shows a partial side view of a high-pressure fuel accumulator
  • FIG. 2 shows a detail section of a branching of the pressure accumulator according to FIG. 1 and
  • Figure 3 shows a lance to influence the rounding in the inventive method for manufacturing the pressure accumulator.
  • Figure 1 shows a pressure accumulator 2, which consists of an essentially cylindrical tube 4 made of steel. On the outer circumference of the tube 4, several pressure line connections 6 can be seen, to each of which pressure lines can be connected, which lead to injectors of the internal combustion engine.
  • the tube 4 is preferably made of steel, which can be forged for strength reasons. Suitable materials for the pressure accumulator 2 are, for example, structural steel, case hardening steel, tempering steel or stainless steel, which is preferably forged.
  • FIG. 2 shows a detailed section of a branch 8 of the pressure accumulator 2 according to FIG. 1.
  • an inner bore 11 can be seen, which runs essentially cylindrically in the interior of the hollow pressure accumulator 2.
  • a plurality of branches 8 are provided perpendicular to the longitudinal direction of extension of the inner bore 11 of the tube 4, only one of which can be seen in FIG. 2.
  • the round branching can, for example, be designed as a bore which opens centrally into the inner bore 11 of the tube 4.
  • an inner edge 9 of the branch 8 is provided with a radius 10 which is produced by shot peening. Shot peening also serves to solidify the inner surface of the tube 4, thereby significantly reducing its notching effect.
  • an essentially cylindrical lance 12 which has a conical tip 14 at its end facing the beam direction 16, is guided in the shot peening along a longitudinal extension direction of the inner bore 11 in the opposite or in the same direction to the beam direction 16.
  • the cone tip 14 of the lance 12 causes a deflection of the blasting material in the direction of the walls of the inner bore 11 and in the direction of the inner edge 9 of each branch 8, whereby the inner edges 9 each have a radius 10.
  • the irradiation is carried out in both directions of the longitudinal direction of the tube 4, the lance 12 with its Cone tip 14 points in the opposite direction.
  • the beam direction 16 would be from right to left in this case, the cone tip 14 would point to the right in this case.
  • a lance is illustrated in FIG. 3, which is used to influence the rounding in the method according to the invention for producing the pressure accumulator.
  • the left image in FIG. 3 shows a top view of the cone tip 14 of the lance 12.
  • On the outer cylindrical circumference of the lance 12 a total of three support elements 18 can be seen, which are distributed in a star shape uniformly on the circumference of the lance 12 and which are dimensioned in terms of their length. that a largely play-free sliding movement of the lance 12 in the inner bore 11 of the tube 4 is made possible.
  • the right image in FIG. 3 shows a side view of a lance 12, two of the three support elements 18 being recognizable.
  • So-called shot peening which consists of metal balls of a certain hardness, is particularly suitable for shot peening. The balls each have a diameter between 0.2 and 0.6 mm, the different diameters in the blasting material following a statistical distribution.
  • Rounded grit is also particularly suitable as blasting material, ie a blasting material with a defined size and defined hardness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a method for the production of a high-pressure fuel accumulator of an internal engine fitted with an accumulator injection system, especially a diesel internal combustion engine with a common rail injection system, wherein a metal hollow pressure accumulator (2) is produced, branches (8) are subsequently made therein for the connection of pressure lines, said branches being respectively provided with a radius (10) on the inner edges (9) thereof leading to a cavity of the pressure accumulator by means of a shot blasting method and a cylindrical lance (12) having a conical tip (14) with a smaller diameter than that of the cavity of the pressure accumulator is guided counter to the direction of the blasting (16) of the balls used for blasting according to said shot blasting method. According to the invention, each inner edge (9) is blasted successively in both directions in which the cavity of the pressure accumulator (2) extends and the lance (12) is respectively guided in an opposite direction.

Description

Beschreibungdescription
Verfahren zur1 Herstellung eines KraftstoffhochdruckspeichersProcess for 1 Preparation of a fuel high-pressure accumulator
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kraftstoffhochdruckspeicher gemäß dem unabhängigen Patentanspruch.The invention relates to a method for producing a high-pressure fuel accumulator according to the independent claim.
Kraftstofrfhochdruckspeicher kommen insbesondere bei Dieselmo- toren mit sogenannten Common-Rail-Systemen zum Einsatz. Der Kraftstoff wird dabei mittels einer Hochdruckpumpe auf einen Druck von mehr als 1000 bis über 2000 bar verdichtet und dem Kraftstoffhochdruckspeicher zugeführt. Von diesem führen Druckleitungen zu den Injektoren der einzelnen Brennräume der Brennkraftmaschine. Der Kraftstoffhochdruckspeicher unterliegt bei den herrschenden Drücken einer erheblichen mechanischen Belastung, die zudem im Betrieb stark schwankt.High-pressure fuel accumulators are used in particular in diesel engines with so-called common rail systems. The fuel is compressed to a pressure of more than 1000 to more than 2000 bar using a high-pressure pump and fed to the high-pressure fuel reservoir. From this pressure lines lead to the injectors of the individual combustion chambers of the internal combustion engine. The high-pressure fuel reservoir is subject to a considerable mechanical load at the prevailing pressures, which also fluctuates greatly during operation.
Um eine ausreichende Dauerdruckfestigkeit und Dauerpulsfes- tigkeit zu erreichen, insbesondere bei den zukünftigen höheren Einspritzdrücken, ist es sinnvoll, in die Oberfläche der inneren Bohrung des. Kraftstoffhochdruckspeichers Druckeigenspannungen einzubringen. Dies kann bspw. mittels Innenkugel- strahlen erfolgen. Nachteilig hierbei ist jedoch die dabei auftretende unterschiedliche Strahlwirkung an den der inneren Verschneidungskanten zu den Leitungsabzweigungen, die in ungleichförmiger Verrundung sichtbar werden. Andererseits ist auch eine zu starke Verrundung der inneren Verschneidungskanten nachteilig.In order to achieve sufficient permanent compressive strength and constant pulse strength, especially with the future higher injection pressures, it makes sense to introduce residual compressive stresses into the surface of the inner bore of the high-pressure fuel accumulator. This can be done, for example, by means of inner shot blasting. A disadvantage here, however, is the different beam effect that occurs on the inner intersection edges to the line branches, which become visible in a non-uniform rounding. On the other hand, excessive rounding of the inner intersection edges is also disadvantageous.
Aufgabe der Erfindung ist es, ein Verfahren zur Erhöhung der Druckfestigkeit eines Kraftstoffhochdruckspeichers zur Verfügung zu stellen, das die Nachteile im Stand der Technik vermeidet und das eine optimierte Strahlwirkung der inneren Ver- schneidungskanten ermöglicht. Diese Aufgabe wird mit einem Verfahren gemäß dem unabhängigen Patentanspruch 1 gelöst. Merkmale vorteilhafter Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.The object of the invention is to provide a method for increasing the pressure resistance of a high-pressure fuel accumulator, which avoids the disadvantages in the prior art and which enables an optimized blasting effect of the inner cutting edges. This object is achieved with a method according to independent claim 1. Features of advantageous developments of the invention result from the dependent claims.
Bei einem erfindungsgemäßen Verfahren zur Herstellung eines Kraftstoffhochdruckspeichers einer Brennkraftmaschine mit Speichereinspritzsystem, insbesondere einer Dieselbrennkraftmaschine mit Common-Rail-Einspritzsystem, bei dem nach der Herstellung eines hohlen Druckspeichers aus Metall Verzwei- gungen zum Anschluss von Druckleitungen in diesen eingebracht werden, ist vorgesehen, dass die Innenbohrung und insbesondere die gefährdeten Verzweigungen an ihren zu einem Hohlraum des Druckspeichers führenden Innenkanten mittels eines Kugelstrahlverfahrens behandelt werden. Hierdurch werden Druckei- genspannungen in das Material eingebracht. Die Ausprägung von Radien ist Folge einer solchen Behandlung.In a method according to the invention for producing a high-pressure fuel accumulator of an internal combustion engine with a storage injection system, in particular a diesel internal combustion engine with a common rail injection system, in which branchings for connecting pressure lines are introduced into the latter after the production of a hollow pressure accumulator from metal, the Inner bore and in particular the vulnerable branches on their inner edges leading to a cavity of the pressure accumulator are treated by means of a shot peening process. As a result, residual compressive stresses are introduced into the material. The formation of radii is the result of such a treatment.
Bei dem Verfahren wird eine zylindrische Lanze mit kegelförmiger Spitze mit kleinerem Durchmesser als der Hohlraum des Druckspeichers gegen oder in eine Strahlrichtung der beim Kugelstrahlverfahren verwendeten Kugeln geführt. Erfindungsgemäß wird jede Innenkante jeder Verzweigung nacheinander in beiden Richtungen des Verlaufs des Hohlraums des Druckspeichers gestrahlt, wobei jeweils die Lanze gegen und/oder in Strahlrichtung geführt wird.In the process, a cylindrical lance with a conical tip with a smaller diameter than the cavity of the pressure accumulator is guided against or in a jet direction of the balls used in the shot-peening process. According to the invention, each inner edge of each branch is blasted one after the other in both directions of the course of the cavity of the pressure accumulator, the lance being directed against and / or in the jet direction.
Dieses erfindungsgemäße Verfahren hat den Vorteil, dass die Verrundungen der Innenkanten der Verzweigungen im Hochdruckspeicher wesentlich gleichmäßiger und mit konstantem Radius gefertigt werden können. Die Bestrahlung in beiden Längsrichtungen des Hohlraums des Druckspeichers führt zu einer konstanten Behandlung entlang der gesamten Innenkante jeder Verzweigung. Die entgegen der Strahlrichtung der Kugeln längs geführte Lanze dient zur Umlenkung der Kugeln in Richtung der Wände der Innenbohrung des Druckspeichers. Eine Bestrahlung in zwei Richtungen führt de gemäss zu einer konstanten Verrundung je nach Dauer der Bestrahlung. Das Strahlen von bei- den Seiten gewährleistet, dass die Innenkanten an allen Seiten gleichmäßig behandelt werden.This method according to the invention has the advantage that the rounding of the inner edges of the branches in the high-pressure accumulator can be produced much more uniformly and with a constant radius. The radiation in both longitudinal directions of the cavity of the pressure accumulator leads to a constant treatment along the entire inner edge of each branch. The lance, which runs longitudinally against the jet direction of the balls, serves to deflect the balls in the direction of the walls of the inner bore of the pressure accumulator. Irradiation in two directions accordingly leads to a constant rounding depending on the duration of the irradiation. The radiance of the sides ensures that the inside edges are treated evenly on all sides.
Bei einer Weiterbildung des erfindungsgemäßen Verfahrens wird arrondiertes Strahlkorn verwendet, d.h. ein Strahlgut definierter Kugelgröße und definierter Kugelhärte. Das Kugelstrahlen mit einem solchen Strahlgut sorgt für exakt reproduzierbare Abmessungen und Eigenschaften des Hochdruckspeichers auch bei der Bearbeitung von umfangreichen Chargen.In a further development of the method according to the invention, rounded jet grain is used, i.e. a blasting material of defined ball size and defined ball hardness. Shot peening with such blasting material ensures precisely reproducible dimensions and properties of the high-pressure accumulator, even when processing large batches.
Je nach gewünschten Bauteilfestigkeiten und nach gewünschtem Einsatzzweck kann der Hochdruckspeicher aus einem Baustahl, einem Einsatzstahl, einem Vergütungsstahl oder auch aus einem rostfreiem Stahl hergestellt werden. Eine bevorzugte Ausfüh- rungsform der Erfindung sieht vor, dass der Hochdruckspeicher aus geschmiedeten Stahl hergestellt wird, der eine besonders hohe Festigkeit und Zähigkeit bei den auftretenden wechselnden Druckbelastungen aufweist. Die genannten Stähle lassen sich alle durch Kugelstrahlen soweit verfestigen, dass die innere Oberfläche verdichtet wird und somit eine Kerbwirkung deutlich reduziert ist.Depending on the desired component strength and the desired application, the high-pressure accumulator can be made from a structural steel, a case-hardening steel, a tempering steel or also from a stainless steel. A preferred embodiment of the invention provides that the high-pressure accumulator is made of forged steel, which has a particularly high strength and toughness under the changing pressure loads that occur. The steels mentioned can all be strengthened by shot peening to such an extent that the inner surface is compacted and thus a notch effect is significantly reduced.
Eine bevorzugte Ausführungsform der Erfindung sieht vor, dass die Lanze im Druckspeicher zentrisch geführt wird. Die zent- rische Führung der im wesentlichen zylindrischen Lanze im e- benfalls zylindrischen inneren Hohlraum des Druckspeichers führt aufgrund der Kegelspitze der Lanze zu einer weitgehend gleichmäßigen Verfestigung der inneren Oberfläche des Druckspeichers. Die zentrische Führung kann vorzugsweise dadurch gewährleistet werden, dass die Lanze über wenigstens drei gleichmäßig am zylindrischen Umfang verteilte Abstützelemente verfügt, die im Hohlraum des Druckspeichers längs seiner Längserstreckungsrichtung entlang gleiten können.A preferred embodiment of the invention provides that the lance is guided centrally in the pressure accumulator. The central guidance of the essentially cylindrical lance in the likewise cylindrical inner cavity of the pressure accumulator leads to a largely uniform solidification of the inner surface of the pressure accumulator due to the cone tip of the lance. The central guidance can preferably be ensured in that the lance has at least three support elements which are evenly distributed on the cylindrical circumference and which can slide along the longitudinal direction in the cavity of the pressure accumulator.
Die Erfindung wird nun anhand von Ausführungsformen mit Bezug auf die beiliegenden Figuren näher erläutert. Es zeigen: Figur 1 eine teilweise Seitenansicht eines Kraftstoffhochdruckspeichers,The invention will now be explained in more detail by means of embodiments with reference to the accompanying figures. Show it: FIG. 1 shows a partial side view of a high-pressure fuel accumulator,
Figur 2 einen Detailschnitt einer Verzweigung des Druck- Speichers gemäß Figur 1 und2 shows a detail section of a branching of the pressure accumulator according to FIG. 1 and
Figur 3 eine Lanze zur Beeinflussung der Verrundung beim erfindungsgemäßen Verfahren zur Herstellung des Druckspeichers .Figure 3 shows a lance to influence the rounding in the inventive method for manufacturing the pressure accumulator.
Figur 1 zeigt einen Druckspeicher 2, der aus einem im wesentlichen zylindrischen Rohr 4 aus Stahl besteht. Am äußeren Umfang des Rohres 4 sind mehrere Druckleitungsanschlüsse 6 erkennbar, an die jeweils Druckleitungen angeschlossen werden können, die zu Injektoren der Brennkraftmaschine führen. Das Rohr 4 besteht vorzugsweise aus einem Stahl, der aus Festigkeitsgründen geschmiedet sein kann. Als Material für den Druckspeicher 2 kommt beispielsweise Baustahl, Einsatzstahl, Vergütungsstahl oder rostfreier Stahl in Frage, der vorzugs- weise geschmiedet ist.Figure 1 shows a pressure accumulator 2, which consists of an essentially cylindrical tube 4 made of steel. On the outer circumference of the tube 4, several pressure line connections 6 can be seen, to each of which pressure lines can be connected, which lead to injectors of the internal combustion engine. The tube 4 is preferably made of steel, which can be forged for strength reasons. Suitable materials for the pressure accumulator 2 are, for example, structural steel, case hardening steel, tempering steel or stainless steel, which is preferably forged.
Figur 2 zeigt einen Detailausschnitt einer Verzweigung 8 des Druckspeichers 2 gemäß Fig. 1. In dieser Darstellung ist eine Innenbohrung 11 erkennbar, die im wesentlichen zylindrisch im Inneren des hohlen Druckspeichers 2 verläuft. Senkrecht zur Längserstreckungsrichtung der Innenbohrung 11 des Rohres 4 sind mehrere Verzweigungen 8 vorgesehen, von denen in Fig. 2 nur eine erkennbar ist. Die runde Verzweigung kann beispielsweise als Bohrung ausgeführt sein, die mittig in die Innen- bohrung 11 des Rohres 4 mündet. Eine Innenkante 9 der Verzweigung 8 ist zur Erhöhung der Betriebsfestigkeit des Druckspeichers 2 mit einem Radius 10 versehen, der durch Kugel- strahlen entsteht. Das Kugelstrahlen dient gleichzeitig zur Verfestigung der inneren Oberfläche der Rohres 4, wodurch dessen Kerbwirkung signifikant herabgesetzt wird. Der Druckspeicher 2 kann auf diese Weise erheblichen Schwellbelastungen im Betrieb widerstehen. Erfindungsgemäß wird beim Kugelstrahlen entlang einer Längserstreckungsrichtung der Innenbohrung 11 in entgegengesetzter oder in gleicher Richtung zur Strahlrichtung 16 eine im we- sentlichen zylindrische Lanze 12 geführt, die eine Kegelspitze 14 an ihrem der Strahlrichtung 16 zugewandten Ende aufweist. Die Kegelspitze 14 der Lanze 12 bewirkt eine Ablenkung des Strahlgutes in Richtung der Wände der Innenbohrung 11 sowie in Richtung der Innenkante 9 jeder Verzweigung 8, wodurch die Innenkanten 9 jeweils einen Radius 10 erhalten. Bei einer Bestrahlung in nur einer Längserstreckungsrichtung der Innenbohrung 11 besteht jedoch die Gefahr eines ungleichmäßigen Radius 10 über den Umfang einer jeden Innenkante 9. Erfindungsgemäß ist deshalb vorgesehen, die Bestrahlung in beiden Richtungen der Längserstreckungsrichtung des Rohres 4 vorzunehmen, wobei jeweils die Lanze 12 mit ihrer Kegelspitze 14 in entgegengesetzte Richtung weist. Nach einer Bestrahlung von gewisser Dauer, wie sie in Figur 2 gezeigt ist, erfolgt demzufolge eine ebenso lange Bestrahlung in entgegengesetzter Richtung. Die Strahlrichtung 16 wäre in diesem Fall von rechts nach links, die Kegelspitze 14 würde in diesem Fall nach rechts weisen.FIG. 2 shows a detailed section of a branch 8 of the pressure accumulator 2 according to FIG. 1. In this illustration, an inner bore 11 can be seen, which runs essentially cylindrically in the interior of the hollow pressure accumulator 2. A plurality of branches 8 are provided perpendicular to the longitudinal direction of extension of the inner bore 11 of the tube 4, only one of which can be seen in FIG. 2. The round branching can, for example, be designed as a bore which opens centrally into the inner bore 11 of the tube 4. To increase the operational strength of the pressure accumulator 2, an inner edge 9 of the branch 8 is provided with a radius 10 which is produced by shot peening. Shot peening also serves to solidify the inner surface of the tube 4, thereby significantly reducing its notching effect. In this way, the pressure accumulator 2 can withstand considerable threshold loads during operation. According to the invention, an essentially cylindrical lance 12, which has a conical tip 14 at its end facing the beam direction 16, is guided in the shot peening along a longitudinal extension direction of the inner bore 11 in the opposite or in the same direction to the beam direction 16. The cone tip 14 of the lance 12 causes a deflection of the blasting material in the direction of the walls of the inner bore 11 and in the direction of the inner edge 9 of each branch 8, whereby the inner edges 9 each have a radius 10. When irradiation in only one longitudinal direction of the inner bore 11, however, there is a risk of an uneven radius 10 over the circumference of each inner edge 9. According to the invention, it is therefore provided that the irradiation is carried out in both directions of the longitudinal direction of the tube 4, the lance 12 with its Cone tip 14 points in the opposite direction. After irradiation of a certain duration, as shown in FIG. 2, there is consequently an equally long irradiation in the opposite direction. The beam direction 16 would be from right to left in this case, the cone tip 14 would point to the right in this case.
In Figur 3 ist eine Lanze verdeutlicht, die zur Beeinflussung der Verrundung beim erfindungsgemäßen Verfahren zur Herstellung des Druckspeichers dient. Das linke Bild der Figur 3 zeigt eine Aufsicht auf die Kegelspitze 14 der Lanze 12. Am äußeren zylindrischen Umfang der Lanze 12 sind insgesamt drei Abstützelemente 18 erkennbar, die sternförmig gleichmäßig am Umfang der Lanze 12 verteilt sind und die von ihrer Länge so bemessen sind, dass eine weitgehend spielfreie Gleitbewegung der Lanze 12 in der Innenbohrung 11 des Rohres 4 ermöglicht ist. Das rechte Bild der Figur 3 zeigt eine Seitenansicht auf eine Lanze 12, wobei zwei der drei Abstützelemente 18 erkenn- bar sind. Zum Kugelstrahlen eignet sich insbesondere sogenanntes Kugelstrahlkorn, welches aus Metallkugeln bestimmter Härte besteht. Die Kugeln weisen jeweils einen Durchmesser zwischen 0 , 2 und 0, 6 mm auf, wobei die verschiedenen Durchmesser im Strahlgut einer statistischen Verteilung folgen.A lance is illustrated in FIG. 3, which is used to influence the rounding in the method according to the invention for producing the pressure accumulator. The left image in FIG. 3 shows a top view of the cone tip 14 of the lance 12. On the outer cylindrical circumference of the lance 12, a total of three support elements 18 can be seen, which are distributed in a star shape uniformly on the circumference of the lance 12 and which are dimensioned in terms of their length. that a largely play-free sliding movement of the lance 12 in the inner bore 11 of the tube 4 is made possible. The right image in FIG. 3 shows a side view of a lance 12, two of the three support elements 18 being recognizable. So-called shot peening, which consists of metal balls of a certain hardness, is particularly suitable for shot peening. The balls each have a diameter between 0.2 and 0.6 mm, the different diameters in the blasting material following a statistical distribution.
Als Strahlgut eignet sich insbesondere auch arrondiertes Strahlkorn, d.h. ein Strahlgut mit definierter Größe und definierter Härte. Rounded grit is also particularly suitable as blasting material, ie a blasting material with a defined size and defined hardness.
Bezugs zeichenlisteReference character list
2 Druckspeicher2 pressure accumulators
4 Rohr4 pipe
6 Druckleitungsanschluss6 pressure line connection
8 Verzweigung8 branching
9 Innenkante9 inner edge
10 Radius10 radius
11 Innenbohrung11 inner bore
12 Lanze12 lance
14 Kegelspitze14 cone tip
16 Strahlrichtung16 beam direction
18 Abstützelement 18 support element

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Kraftstoffhochdruckspei- chers einer Brennkraftmaschine mit Speichereinspritzsys- tem, insbesondere einer Dieselbrennkraftmaschine mit1. Method for producing a high-pressure fuel reservoir of an internal combustion engine with a storage injection system, in particular a diesel internal combustion engine
Common-Rail-Einspritzsystem, bei dem nach der Herstellung eines hohlen Druckspeichers (2) aus Metall Verzweigungen (8) zum Anschluss von Druckleitungen in diesen eingebracht werden, wobei die Verzweigungen (8) an ihren zu einem Hohlraum des Druckspeichers (2) führenden Innenkanten (9) mittels eines Kugelstrahlverfahrens jeweils mit einem Radius (10) versehen werden und wobei eine zylindrische Lanze (12) mit kegelförmiger Spitze (14) mit kleinerem Durchmesser als der Hohlraum des Druckspeichers (2) gegen eine Strahlrichtung (16) der beim Kugelstrahlverfahren verwendeten Kugeln geführt wird, dadurch gekennzeichnet, dass jede Innenkante (9) nacheinander in beiden Richtungen des Verlaufs des Hohlraumes des Druckspeichers (2) gestrahlt wird, wobei jeweils die Lanze (12) in entgegengesetzter Richtung geführt wird.Common rail injection system, in which branches (8) for connecting pressure lines are introduced into these after the production of a hollow pressure accumulator (2) from metal, the branches (8) on their inner edges leading to a cavity of the pressure accumulator (2) (9) are each provided with a radius (10) by means of a shot-peening process and a cylindrical lance (12) with a conical tip (14) with a smaller diameter than the cavity of the pressure accumulator (2) against a jet direction (16) of that used in the shot-peening process Balls is guided, characterized in that each inner edge (9) is successively blasted in both directions of the course of the cavity of the pressure accumulator (2), the lance (12) being guided in the opposite direction.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mit dem Verfahren ein im Wesentlichen zylindrischer Druckspeicher (2) hergestellt wird.2. The method according to claim 1, characterized in that an essentially cylindrical pressure accumulator (2) is produced with the method.
3. Verfahren nach Anspruch 1 oder 2, ge ennzeichnet durch die Verwendung von arrondiertem Strahlkorn als Strahlgut.3. The method according to claim 1 or 2, characterized by the use of rounded blasting grain as blasting material.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Kraftstoffhochdruckspeicher aus einem Baustahl, ei- nem Einsatzstahl, einem Vergütungsstahl oder aus einem rostfreien Stahl hergestellt wird.4. The method according to any one of claims 1 to 3, characterized in that the high-pressure fuel accumulator made of a structural steel, egg a case-hardening steel, a tempering steel or a stainless steel.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kraftstoffhochdruckspeicher aus geschmiedetem Stahl hergestellt wird.5. The method according to any one of claims 1 to 4, characterized in that the high-pressure fuel accumulator is made of forged steel.
6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Lanze (12) im Druckspeicher (2) zentrisch geführt wird.6. The method according to any one of the preceding claims, characterized in that the lance (12) in the pressure accumulator (2) is guided centrally.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die zentrische Führung der Lanze (12) mittels wenigstens dreier gleichmäßig am zylindrischen Umfang der Lanze (12) verteilter Abstützelemente (18) erfolgt. 7. The method according to claim 6, characterized in that the central guidance of the lance (12) takes place by means of at least three support elements (18) distributed uniformly on the cylindrical circumference of the lance (12).
EP02769909A 2001-09-06 2002-09-05 Method for the production of a high-pressure fuel accumulator Withdrawn EP1423237A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10143736 2001-09-06
DE10143736A DE10143736C1 (en) 2001-09-06 2001-09-06 Method for producing a high-pressure fuel accumulator
PCT/DE2002/003291 WO2003022526A2 (en) 2001-09-06 2002-09-05 Method for the production of a high-pressure fuel accumulator

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EP1423237A2 true EP1423237A2 (en) 2004-06-02

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US (1) US6931900B2 (en)
EP (1) EP1423237A2 (en)
JP (1) JP2005500916A (en)
DE (1) DE10143736C1 (en)
HU (1) HUP0401734A2 (en)
WO (1) WO2003022526A2 (en)

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DE102004051004B3 (en) 2004-10-20 2006-06-01 Bayerische Motoren Werke Ag Longitudinal dynamics control system in motor vehicles
JP4484227B2 (en) * 2006-10-02 2010-06-16 ボッシュ株式会社 Common rail
FR2908678B1 (en) * 2007-11-27 2010-03-12 Sonats Soc Des Nouvelles Appli METHOD FOR GRILLING A DRILL
US8322004B2 (en) * 2009-04-29 2012-12-04 Caterpilar Inc. Indirect laser induced residual stress in a fuel system component and fuel system using same
JP5500416B2 (en) * 2009-09-09 2014-05-21 株式会社リコー Interlock switch and image forming apparatus using the same
US8561593B2 (en) * 2010-03-05 2013-10-22 Caterpillar Inc. Range of engines using common rail fuel system with pump and rail assemblies having common components
CN104209437B (en) * 2014-09-02 2016-06-01 许崇霞 High-pressure common rail Preform Die

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US3485073A (en) * 1966-05-10 1969-12-23 Metal Improvement Co Internal peening apparatus
IN166218B (en) * 1984-11-09 1990-03-31 Framatome & Cie
FR2612291B1 (en) * 1987-03-13 1992-05-07 Framatome Sa DEVICE AND METHOD FOR CONTROLLING THE EFFICIENCY OF PARTICLE HAMMING OF THE INTERIOR SURFACE OF A STEAM GENERATOR TUBE
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US6931900B2 (en) 2005-08-23
HUP0401734A2 (en) 2004-11-29
DE10143736C1 (en) 2002-08-22
JP2005500916A (en) 2005-01-13
US20040168494A1 (en) 2004-09-02
WO2003022526A3 (en) 2003-10-02
WO2003022526A2 (en) 2003-03-20

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