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EP1180068B1 - Method and device for rounding edges - Google Patents

Method and device for rounding edges Download PDF

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Publication number
EP1180068B1
EP1180068B1 EP00987051A EP00987051A EP1180068B1 EP 1180068 B1 EP1180068 B1 EP 1180068B1 EP 00987051 A EP00987051 A EP 00987051A EP 00987051 A EP00987051 A EP 00987051A EP 1180068 B1 EP1180068 B1 EP 1180068B1
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EP
European Patent Office
Prior art keywords
edge
rounded
fluid
erosive
edges
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.)
Expired - Lifetime
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EP00987051A
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German (de)
French (fr)
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EP1180068A2 (en
Inventor
Matthias Thiem
Johannes Amon
Gerhard Schlereth
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08Methods 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
    • B24C1/083Deburring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00Abrasive blasting machines or devices; Plants
    • B24C3/32Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325Abrasive 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00Abrasive blasting machines or devices; Plants
    • B24C3/32Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325Abrasive 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
    • B24C3/327Abrasive 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 by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface

Definitions

  • the invention relates to a method and a device for rounding edges according to the preamble of the independent claim 4.
  • microbores are required with defined hydraulic properties, for example, to keep the dispersion of the performance of mass-produced injectors as small as possible.
  • the invention has for its object to provide a method by which macroscopic edges can be rounded even in inaccessible places with great repeatability, high material removal rate and at low cost.
  • This method has the advantage that it is possible to round off any edges that may be present at any point of components, even with complicated geometry.
  • the expenditure on equipment is manageable, the processing time is low and the quality of the rounding high. Furthermore arise only small costs.
  • a continuous quantity measurement of the erosive liquid By a continuous quantity measurement of the erosive liquid, a high process reliability is achieved.
  • the material removal at edges due to the usually increased flow velocity, greatest, so that at the other sites acted upon by the erosive fluid, no or only a very small material removal takes place.
  • the flow behavior of the erosive liquid corresponds to flow through components such.
  • the flow velocity of the liquid in the region of the edge to be rounded relative to the average flow velocity of the liquid is increased, so that a particularly large material removal is achieved in the region of the edge to be rounded.
  • a body is introduced into the liquid whose surface forms a gap with the edge to be rounded, so that the flow velocity of the liquid in the region of the edge to be healed is further increased compared to the average flow velocity of the liquid and thus the material removal.
  • the flow direction of the liquid and the longitudinal axis of the edge to be rounded at an angle, in particular of 90 °, include, so that the material removal is further intensified.
  • a device with a delivery pump for the erosive fluid and with a hydraulic connection between the delivery pump and the component, the edge of which is to be rounded, by forming a gap with the edge to be rounded is present, so that the flow velocity of the erosive liquid in the region of the edge to be rounded relative to the average flow velocity of the erosive liquid increases and thus the rounding of the edge is accelerated.
  • a body forming a gap with the edge to be rounded is present, so that the flow velocity of the erosive liquid in the region of the edge to be rounded is increased compared to the average flow velocity of the erosive liquid and thus the edge rounding is accelerated.
  • a collecting device for collecting the liquid is present, so that the erosive liquid does not escape into the environment.
  • the erosive fluid is circulated, so that their consumption is reduced.
  • a high-pressure fuel storage 1 according to the prior art is shown in partial longitudinal section.
  • the high-pressure fuel storage 1 has one or more connecting pieces 2, of which in Fig. 1, only one is shown.
  • a fastening tab 3 is visible.
  • the connecting piece 2 has a bore 4, which connects the connecting piece 2 with the storage space 5 hydraulically.
  • An edge 6, which results from the intersection between bore 4 and storage space 5 high mechanical stresses occur during operation, which can result in breaks.
  • a tried and tested means to reduce these stresses is to round off the edge 6. Due to the geometric conditions, this is the case with countersinks or the like. not or only conditionally possible. In any case, high costs arise.
  • the rounding can be simple, effective, inexpensive and fast with cycle times of 20 s to 200 s.
  • a hydraulic connection is made with a delivery pump (also not shown).
  • the feed pump delivers an erosive liquid into the high-pressure fuel storage 1, which is discharged through the bore 4.
  • the flow velocity of the liquid increases due to the cross-sectional constriction. Due to the high flow rate of the liquid, the edge 6 is rounded by the erosive liquid.
  • the material removal at sharp edges is greater than at blunt edges or surfaces.
  • the flow rate and thus also the material removal can be influenced.
  • delivery pressures between 50 bar and 140 bar have been found suitable.
  • FIG. 2 shows a cross section of a further embodiment of a high-pressure fuel accumulator 1.
  • the connecting piece 2 has an internal thread 8 with which a high-pressure line, not shown, can be screwed.
  • the edge 5 Since the bore 4 does not open vertically into the storage space 5, the edge 5, viewed over the circumference of the bore 4, does not always have the same sharpness. At point 9, it is the sharpest, while at point 10 it is much duller. After rounding the high-pressure fuel storage 1 was cut in the plane A - A and examined. It has been shown that the edge 6 was rounded most at the point 9, while the material removal at the point 10 was lower.
  • FIG. 3 shows the result of a measurement of the rounding in the plane A - A at the sharp-edged point 9. Shown in this diagram, the rounding contour of the sharp-edged point 9 in Fig. 2 (Y-axis) on the direction of movement of the probe (X- Axis).
  • the radius of curvature R is 0.782 mm.
  • FIG. 4 shows an injection nozzle 11 for a fuel injection system with a conical blind hole 12. Via an injection hole 13, the fuel, not shown, passes from the blind hole 12 in the combustion chamber, also not shown.
  • the conical blind hole 12 is followed by a frusto-conical Nozzle needle seat 14 on.
  • edge 16 On the left side of FIG. 4, a transition between blind hole 12 and nozzle needle seat 14 according to the prior art is shown as edge 16. This edge 16 is formed when grinding the nozzle needle seat 14. Depending on the type of processing, the edge 16 may be a sharp burr or a smooth edge.
  • a transition 17 according to the invention rounded between blind hole 12 and nozzle needle seat 14 is shown.
  • an erosive liquid from the nozzle needle seat 14 is conveyed through the injection hole 13.
  • a body 15, which consists for example of ceramic and whose geometry substantially corresponds to a nozzle needle, is introduced into the injection nozzle 11 during rounding.
  • the flow velocity of the unillustrated erosive fluid is highest in the region of the edge 16 and the rounded transition 17, respectively.
  • most of the material is eroded there and therefore especially a rounding brought about there.
  • edges of any kind can be used on outer contours or inner contours are rounded by means of a body 15 when the flow velocity in the region of the edges 5 or 16 is sufficiently high. Since the flow rate of the liquid is only in the range of. Edge 5 or 16 must be high, the removal of erosive fluid at the other points of the workpiece and the pump and other facilities is very low. This prolongs their life.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Complex Calculations (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Prostheses (AREA)

Abstract

The invention relates to a method and a device for rounding edges (6). An erosive liquid enables to round edges (6) even at points that are difficult to access or have a complicated geometry.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zu Verrunden von Kanten nach dem Oberbegriff des nebengeordneten Anspruchs 4.The invention relates to a method and a device for rounding edges according to the preamble of the independent claim 4.

In vielen mechanisch, thermisch oder in sonstiger Weise hoch belasteten Bauteilen treten im Bereich von Kanten aller Art Spannungsspitzen auf, die das Risiko eines Bauteilversagens in sich bergen. Es ist seit langem bekannt, diese Spannungsspitzen durch das Anbringen von Freistichen und/oder Radien mindestens teilweise abzubauen und somit die Belastungsgrenze des Bauteils nach oben zu verschieben. Bei vielen Bauteilen stößt diese Vorgehensweise an Grenzen; da die erforderlichen Schneidwerkzeuge, wie Drehmeißel, Radienfräser, Schleifkörper odgl., einen gewissen Platzbedarf haben, der nicht immer befriedigt werden kann. Beispielsweise sind bei Kraftstoffeinspritzsystemen verschiedene hoch belastete Bauteile vorhanden, die für die o. g. Werkzeuge nicht oder nur mit erheblichem Aufwand zugänglich sind.In many mechanically, thermally or otherwise highly stressed components, voltage peaks occur in the area of edges of all kinds, which involve the risk of a component failure. It has long been known to at least partially reduce these voltage spikes by the application of undercuts and / or radii and thus to move the load limit of the component upwards. For many components, this approach comes up against limits; because the required cutting tools, such as lathe tools, radius cutters, grinding wheels or the like, have a certain amount of space that can not always be satisfied. For example, in fuel injection systems various highly loaded components are present, which for the o. G. Tools are not accessible or only with considerable effort.

Bei anderen Bauteilen, wie z. B. Einspritzdüsen, werden Mikrobohrungen mit definierten hydraulischen Eigenschaften benötigt, um beispielsweise die Streuung des Betriebsverhaltens von in Serie gefertigten Einspritzdüsen möglichst klein zu halten.For other components, such. As injectors, microbores are required with defined hydraulic properties, for example, to keep the dispersion of the performance of mass-produced injectors as small as possible.

Aus der US 75,807,163 ist ein Verfahren zum Kalibrieren und Verrunden kleinster Bohrungen, wie z. B. Spritzlöchern von Einspritzdüsen, bekannt. Bei dem in der US 75,807,163 beschriebenen Verfahren wird ein Fluid mit thixotropen Eigenschaften durch eine Zuleitung einer Mikrobohrung, die kalibriert werden soll, zugeführt. Dabei hat das Fluid während es durch die Zuleitung strömt eine erste höhere Viskosität und ein erstes kleineres Geschwindigkeitsgefälle. Wenn das Fluid durch die Mikrobohrung strömt, ändern sich dessen rheologische Eigenschaften dahingehend, dass das Fluid eine zweite niedrigere Viskosität und ein zweites größeres Geschwindigkeitsgefälle hat. Dieses Verfahren zielt auf das Kalibrieren und Verrunden von Mikrobohrungen mit Durchmessern kleiner 1 mm oder nicht kreisförmigen Öffnungen mit einem Querschnitt kleiner 3 mm2 ab.From US 75,807,163 a method for calibrating and rounding smallest holes, such. B. spray holes of Injectors, known. In the method described in US Pat. No. 75,807,163, a fluid having thixotropic properties is supplied through a feed of a microbore to be calibrated. In this case, the fluid, while flowing through the supply line, has a first higher viscosity and a first, smaller velocity gradient. As the fluid flows through the microbore, its rheological properties change so that the fluid has a second lower viscosity and a second, larger velocity gradient. This method is aimed at calibrating and rounding microbores with diameters less than 1 mm or non-circular openings with a cross-section smaller than 3 mm 2 .

Außerdem ist das sog. Strömungsschleifen mit einer polymeren Kunststoffmasse bekannt. Beide Verfahren sind nicht geeignet, um beispielsweise die bei der Herstellung von Common-Rails für Kraftstoffeinspritzsysteme entstehenden makroskopischen Grate wirtschaftlich zu entfernen und die vorhandenen Kanten zu verrunden.In addition, the so-called. Flow Grinding with a polymer plastic material is known. Both methods are not suitable, for example, to economically remove the resulting macroscopic burrs in the production of common rails for fuel injection systems and to round off the existing edges.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren bereitzustellen, mit dessen Hilfe makroskopische Kanten auch an unzugänglichen Stellen mit großer Wiederholgenauigkeit, hoher Materialabtragrate und zu günstigen Kosten verrundet werden können.The invention has for its object to provide a method by which macroscopic edges can be rounded even in inaccessible places with great repeatability, high material removal rate and at low cost.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren und eine Vorrichtung zum Kantenverrunden gemäβ Anspruch 1 und Anspruch 4 gelöst.This object is achieved by a method and a device for Kantenverrunden gemäβ claim 1 and claim 4.

Vorteile der ErfindungAdvantages of the invention

Dieses Verfahren hat den Vorteil, dass nahezu an beliebigen Stellen von Bauteilen evtl. vorhandene Kanten auch mit komplizierter Geometrie verrundet werden können. Dabei ist der apparative Aufwand überschaubar, die Bearbeitungsdauer gering und die Qualität der Verrundung hoch. Außerdem entstehen nur geringe Kosten. Durch eine kontinuierliche Mengenmessung der erosiven Flüssigkeit, wird eine hohe Prozeßsicherheit erreicht. Der Materialabtrag ist an Kanten, aufgrund der idR erhöhten Strömungsgeschwindigkeit, am größten, so dass an den anderen mit der erosiven Flüssigkeit beaufschlagten Stellen, keiner oder nur ein sehr geringer Materialabtrag erfolgt. Das Strömungsverhalten der erosiven Flüssigkeit enspricht bei durchströmten Bauteilen, wie z. B. Hochdruckkraftstoffspeichern von Kraftstoffeinspritzsystemen, dem des Kraftstoffs im Betrieb, so dass das erfindungsgemäße Verrunden gleichzeitig ein gewünschtes künstliches Altern des Bauteils bewirkt.This method has the advantage that it is possible to round off any edges that may be present at any point of components, even with complicated geometry. The expenditure on equipment is manageable, the processing time is low and the quality of the rounding high. Furthermore arise only small costs. By a continuous quantity measurement of the erosive liquid, a high process reliability is achieved. The material removal at edges, due to the usually increased flow velocity, greatest, so that at the other sites acted upon by the erosive fluid, no or only a very small material removal takes place. The flow behavior of the erosive liquid corresponds to flow through components such. B. high-pressure fuel storage of fuel injection systems, that of the fuel during operation, so that the rounding invention simultaneously causes a desired artificial aging of the component.

Bei dem erfindungsgemäßen Verfahren ist die Strömungsgeschwindigkeit der Flüssigkeit im Bereich der zu verrundenden Kante gegenüber der durchschnittlichen Strömungsgeschwindigkeit der Flüssigkeit erhöht, so dass im Bereich der zu verrundenden Kante ein besonders großer Materialabtrag erzielt wird.In the method according to the invention, the flow velocity of the liquid in the region of the edge to be rounded relative to the average flow velocity of the liquid is increased, so that a particularly large material removal is achieved in the region of the edge to be rounded.

In dem Verfahren wird in die Flüssigkeit ein Körper eingebracht, dessen Oberfläche mit der zu verrundenden Kante einen Spalt bildet, so dass die Strömungsgeschwindigkeit der Flüssigkeit im Bereich der zu verundenden Kante gegenüber der durchschnittlichen Strömungsgeschwindigkeit der Flüssigkeit und damit der Materialabtrag weiter erhöht wird.In the method, a body is introduced into the liquid whose surface forms a gap with the edge to be rounded, so that the flow velocity of the liquid in the region of the edge to be healed is further increased compared to the average flow velocity of the liquid and thus the material removal.

In Ergänzung des Verfahrens ist vorgesehen, dass die Strömungsrichtung der Flüssigkeit und die Längsachse der zu verrundenden Kante einen Winkel, insbesondere von 90°, einschließen, so dass der Materialabtrag weiter intensiviert wird.In addition to the method is provided that the flow direction of the liquid and the longitudinal axis of the edge to be rounded at an angle, in particular of 90 °, include, so that the material removal is further intensified.

Als besonders vorteilhaft hat es sich erwiesen, als erosive Flüssigkeit eine Suspension eines Schleifmittels in Ö1 zu verwenden. Diese Suspension ermöglicht einen gegenüber der Verwendung einer polymeren Kunststoffmasse höheren Materialabtrag. Außerdem wird das Reinigen der Werkstücke nach der Durchführung des Verfahrens erheblich vereinfacht. Schließlich kann durch die Verwendung einer Suspension anstelle einer Kunststoffmasse der Flüssigkeitsstrom während der Bearbeitung einfach gemessen und überwacht werden. Da der Flüssigkeitsstrom mit dem Materialabtrag an den zu verrundeten Kanten korreliert ist, kann daraus der Fortschritt bei der Werkstückbearbeitung kontinuierlich überwacht werden. Dies ist vor allem bei der Großschienenfertigung von Werkstücken mit höchster Präzision wichtig. Das erfindungsgemäße Verfahren ist somit wirtschaftlicher und hat einen größeren Einsatzbereich.It has proved to be particularly advantageous to use a suspension of an abrasive in oil as the erosive liquid. This suspension allows a higher material removal compared to the use of a polymer plastic compound. In addition, the cleaning of the workpieces after the implementation of the method is considerably simplified. Finally, by using a suspension instead of a plastic mass, the liquid flow during processing can be easily measured and monitored. Since the fluid flow is correlated with the removal of material at the rounded edges, the progress in workpiece machining can be continuously monitored therefrom. This is especially important in the production of large-scale production of workpieces with the highest precision. The inventive method is thus more economical and has a wider range of applications.

Die eingangs genannte Aufgabe wird auch durch eine Vorrichtung nach Anspruch 4 mit einer Förderpumpe für die erosive Flüssigkeit und mit einer hydraulischen Verbindung zwischen Förderpumpe und dem Bauteil, dessen Kante zu verrunden ist, dadurch gelöst, dass ein mit der zu verrundenden Kante einen Spalt bildender Körper vorhanden ist, so dass die Strömungsgeschwindigkeit der erosiven Flüssigkeit im Bereich der zu verrundenden Kante gegenüber der durchschnittlichen Strömungsgeschwindigkeit der erosiven Flüssigkeit erhöht und somit das Verrunden der Kante beschleunigt wird.The object mentioned at the outset is also achieved by a device according to claim 4 with a delivery pump for the erosive fluid and with a hydraulic connection between the delivery pump and the component, the edge of which is to be rounded, by forming a gap with the edge to be rounded is present, so that the flow velocity of the erosive liquid in the region of the edge to be rounded relative to the average flow velocity of the erosive liquid increases and thus the rounding of the edge is accelerated.

Bei der Erfindung ist vorgesehen, dass ein mit der zu verrundenden Kante einen Spalt bildender Körper vorhanden ist, so dass die Strömungsgeschwindigkeit der erosiven Flüssigkeit im Bereich der zu verrundenden Kante gegenüber der durchschnittlichen Strömungsgeschwindigkeit der erosiven Flüssigkeit erhöht und somit das Verrunden der Kante beschleunigt wird.In the invention it is provided that a body forming a gap with the edge to be rounded is present, so that the flow velocity of the erosive liquid in the region of the edge to be rounded is increased compared to the average flow velocity of the erosive liquid and thus the edge rounding is accelerated.

In Ergänzung der Erfindung ist eine Sammeleinrichtung zum Auffangen der Flüssigkeit vorhanden, so dass die erosive Flüssigkeit nicht in die Umwelt gelangt.In addition to the invention, a collecting device for collecting the liquid is present, so that the erosive liquid does not escape into the environment.

Bei einer anderen Ausgestaltung der Erfindung wird die erosive Flüssigkeit im Kreislauf geführt, so dass deren Verbrauch reduziert wird.In another embodiment of the invention, the erosive fluid is circulated, so that their consumption is reduced.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the invention are the following description, the drawings and claims removed.

Zeichnungdrawing

Ein Ausführungsbeispiel des Gegenstands der Erfindung ist in der Zeichnung dargestellt und im folgenden näher beschrieben.An embodiment of the object of the invention is illustrated in the drawing and described in more detail below.

Es zeigen:

Fig. 1:
einen zylindrischen Kraftstoffhochdruckspeicher nach dem Stand der Technik im Teillängsschnitt;
Fig. 2:
einen Querschnitt durch einen Kraftstoffhochdruckspeicher;
Fig. 3:
die Darstellung des Konturverlaufs einer verrundeten Kante in einem X-Y-Diagramm und
Figur 4:
einen Querschnitt durch eine erfindungsgemäß verrundete Sackloch-Einspritzdüse
Show it:
Fig. 1:
a cylindrical fuel high-pressure accumulator according to the prior art in partial longitudinal section;
Fig. 2:
a cross section through a high-pressure fuel storage;
3:
the representation of the contour of a rounded edge in an XY diagram and
FIG. 4:
a cross section through an inventively rounded blind hole injection nozzle

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Fig. 1 ist ein Kraftstoffhochdruckspeicher 1 nach dem Stand der Technik im Teillängsschnitt dargestellt. Der Kraftstoffhochdruckspeicher 1 hat einen oder mehrere Anschlussstutzen 2, von denen in Fig. 1 nur einer dargestellt ist. Außerdem ist eine Befestigungslasche 3 sichtbar. Der Anschlussstutzen 2 weist eine Bohrung 4 auf, die den Anschlussstutzen 2 mit dem Speicherraum 5 hydraulisch verbindet. An einer Kante 6, die sich aus der Verschneidung zwischen Bohrung 4 und Speicherraum 5 ergibt, treten im Betrieb hohe mechanische Spannungen auf, welche Brüche zur Folge haben können. Ein probates Mittel, um diese Spannungen abzubauen, besteht darin, die Kante 6 zu verrunden. Aufgrund der geometrischen Verhältnisse ist dies mit Zapfensenkern odgl. nicht oder nur bedingt möglich. Auf jeden Fall entstehen dabei hohe Kosten.In Fig. 1, a high-pressure fuel storage 1 according to the prior art is shown in partial longitudinal section. The high-pressure fuel storage 1 has one or more connecting pieces 2, of which in Fig. 1, only one is shown. In addition, a fastening tab 3 is visible. The connecting piece 2 has a bore 4, which connects the connecting piece 2 with the storage space 5 hydraulically. At an edge 6, which results from the intersection between bore 4 and storage space 5, high mechanical stresses occur during operation, which can result in breaks. A tried and tested means to reduce these stresses is to round off the edge 6. Due to the geometric conditions, this is the case with countersinks or the like. not or only conditionally possible. In any case, high costs arise.

Das Verrunden kann einfach, wirkungsvoll, kostengünstig und schnell mit Taktzeiten von 20 s bis 200 s erfolgen. Dazu wird an Stelle einer Verschlußschraube 7 eine nicht dargestellte hydraulische Verbindung mit einer ebenfalls nicht dargestellten Förderpumpe hergestellt. Die Förderpumpe fördert eine erosive Flüssigkeit in den Kraftstoffhochdruckspeicher 1, die durch die Bohrung 4 abgeführt wird. Im Bereich der Kante 6 erhöht sich aufgrund der Querschnittsverengung die Strömungsgeschwindigkeit der Flüssigkeit. Durch die hohe Strömungsgeschwindigkeit der Flüssigkeit wird die Kante 6 von der erosiven Flüssigkeit verrundet. Bei dem erfindungsgemäßen Verfahren ist der Materialabtrag an scharfen Kanten größer als an stumpfen Kanten oder Flächen. Die Innenwandung des Kraftstoffhochdruckspeichers 1 wird, weil die Strömungsgeschwindigkeit wegen der Newton'schen Haftbedingung gleich null ist, überhaupt nicht abgetragen.The rounding can be simple, effective, inexpensive and fast with cycle times of 20 s to 200 s. For this purpose, instead of a screw plug 7, a hydraulic connection, not shown, is made with a delivery pump (also not shown). The feed pump delivers an erosive liquid into the high-pressure fuel storage 1, which is discharged through the bore 4. In the region of the edge 6, the flow velocity of the liquid increases due to the cross-sectional constriction. Due to the high flow rate of the liquid, the edge 6 is rounded by the erosive liquid. In the method according to the invention, the material removal at sharp edges is greater than at blunt edges or surfaces. The inner wall of the high-pressure fuel storage 1, because the flow velocity due to the Newtonian adhesive condition is equal to zero, is not removed at all.

Durch das Einstellen des Förderdrucks der Förderpumpe kann die Strömungsgeschwindigkeit und damit auch der Materialabtrag beeinflußt werden. In der Praxis haben sich Förderdrücke zwische 50 bar und 140 bar als geeignet herausgestellt.By adjusting the delivery pressure of the feed pump, the flow rate and thus also the material removal can be influenced. In practice, delivery pressures between 50 bar and 140 bar have been found suitable.

In Fig. 2 ist ein Querschnitt einer weiteren Ausführungsform eines Kraftstoffhochdruckspeichers 1 dargestellt. Der Anschlussstutzen 2 weist ein Innengewinde 8 auf mit dem eine nicht dargestellte Hochdruckleitung verschraubt werden kann .FIG. 2 shows a cross section of a further embodiment of a high-pressure fuel accumulator 1. The connecting piece 2 has an internal thread 8 with which a high-pressure line, not shown, can be screwed.

Da die Bohrung 4 nicht senkrecht in den Speicherraum 5 einmündet ist die Kante 5, über den Umfang der Bohrung 4 betrachtet, nicht überall gleich scharf. An der Stelle 9 ist sie am scharfkantigsten, während sie an der Stelle 10 deutlich stumpfer ist. Nach dem Verrunden wurde der Kraftstoffhochdruckspeicher 1 in der Ebene A - A aufgeschnitten und untersucht. Dabei hat sich gezeigt, dass die Kante 6 an der Stelle 9 am stärksten verrundet wurde, während der Materialabtrag an der Stelle 10 geringer war.Since the bore 4 does not open vertically into the storage space 5, the edge 5, viewed over the circumference of the bore 4, does not always have the same sharpness. At point 9, it is the sharpest, while at point 10 it is much duller. After rounding the high-pressure fuel storage 1 was cut in the plane A - A and examined. It has been shown that the edge 6 was rounded most at the point 9, while the material removal at the point 10 was lower.

Fig. 3 zeigt das Ergebnis einer Messung der Verrundung in der Ebene A - A an der scharfkantigen Stelle 9. Dargestellt ist in diesem Diagramm die Rundungskontur der scharfkantigen Stelle 9 in Fig. 2 (Y-Achse) über der Bewegungsrichtung des Meßtasters (X-Achse). Der Krümmungsradius R beträgt 0,782 mm.3 shows the result of a measurement of the rounding in the plane A - A at the sharp-edged point 9. Shown in this diagram, the rounding contour of the sharp-edged point 9 in Fig. 2 (Y-axis) on the direction of movement of the probe (X- Axis). The radius of curvature R is 0.782 mm.

In Figur 4 ist eine Einspritzdüse 11 für ein Kraftstoffeinspritzsystem mit einem konischen Sackloch 12 dargestellt. Über ein Spritzloch 13 gelangt der nicht dargestellte Kraftstoff aus dem Sackloch 12 in den ebenfalls nicht dargestellten Brennraum. An das konische Sackloch 12 schließt sich ein kegelstumpfförmiger Düsennadelsitz 14 an.FIG. 4 shows an injection nozzle 11 for a fuel injection system with a conical blind hole 12. Via an injection hole 13, the fuel, not shown, passes from the blind hole 12 in the combustion chamber, also not shown. The conical blind hole 12 is followed by a frusto-conical Nozzle needle seat 14 on.

Auf der linken Seite von Figur 4 ist ein Übergang zwischen Sackloch 12 und Düsennadelsitz 14 nach dem Stand der Technik als Kante 16 dargestellt. Diese Kante 16 entsteht beim Schleifen des Düsennadelsitzes 14. Je nach Art der Bearbeitung kann die Kante 16 ein scharfer Grat oder eine glatte Kante sein.On the left side of FIG. 4, a transition between blind hole 12 and nozzle needle seat 14 according to the prior art is shown as edge 16. This edge 16 is formed when grinding the nozzle needle seat 14. Depending on the type of processing, the edge 16 may be a sharp burr or a smooth edge.

Auf der rechten Seite von Figur 4 ist ein erfindungsgemäß verrundeter Übergang 17 zwischen Sackloch 12 und Düsennadelsitz 14 dargestellt. Dazu wird eine erosive Flüssigkeit vom Düsennadelsitz 14 durch das Spritzloch 13 gefördert. Um eine möglichst hohe Strömungsgeschwindigkeit im Bereich der Kante 16, bzw. des verrundeten Übergangs 17 zu erzielen, wird beim Verrunden ein Körper 15, der beispielsweise aus Keramik besteht und dessen Geometrie im wesentlichen einer Düsennadel entspricht, in die Einspritzdüse 11 eingeführt. Wenn der Körper 15 ein wenig vom Düsennadelsitz 14 abgehoben wird, ist wegen der Kontinuitätsgleichung die Strömungsgeschwindigkeit der nicht dargestellten erosiven Flüssigkeit im Bereich der Kante 16, bzw. des verrundeten Übergangs 17 am höchsten. In Folge dessen wird dort auch am meisten Material erodiert und somit vor allem dort eine Verrundung herbeigeführt.On the right side of FIG. 4, a transition 17 according to the invention rounded between blind hole 12 and nozzle needle seat 14 is shown. For this purpose, an erosive liquid from the nozzle needle seat 14 is conveyed through the injection hole 13. In order to achieve the highest possible flow velocity in the region of the edge 16, or of the rounded transition 17, a body 15, which consists for example of ceramic and whose geometry substantially corresponds to a nozzle needle, is introduced into the injection nozzle 11 during rounding. When the body 15 is lifted slightly away from the nozzle needle seat 14, because of the equation of continuity, the flow velocity of the unillustrated erosive fluid is highest in the region of the edge 16 and the rounded transition 17, respectively. As a result, most of the material is eroded there and therefore especially a rounding brought about there.

Als besonders vorteilhaft hat es sich erwiesen, als erosive Flüssigkeit eine Suspension eines Schleifmittels in ÖL zu verwenden. Vor allem in Verbindung mit einer Druckdifferenz von 50 bar bis 140 bar ergibt sich damit ein Materialabtrag, der gegenüber dem mit dem aus dem Stand der Technik bekannten Verfahren sehr viel größer ist. Das erfindungsgemäße Verfahren ist somit wirtschaftlicher und hat einen größeren Einsatzbereich.It has proved to be particularly advantageous to use a suspension of an abrasive in oil as the erosive liquid. Above all, in conjunction with a pressure difference of 50 bar to 140 bar, this results in a material removal, which is much greater than the method known from the prior art. The inventive method is thus more economical and has a wider range of applications.

Grundsätzlich können Kanten jeglicher Art an Außenkonturen oder Innenkonturen mit Hilfe eines Körpers 15 verrundet werden, wenn die Strömungsgeschwindigkeit im Bereich der Kanten 5 oder 16 ausreichend hoch ist. Da die Strömungsgeschwindigkeit der Flüssigkeit nur im Bereich der. Kanten 5 oder 16 hoch sein muss, ist der Materialabtrag der erosiven Flüssigkeit an den anderen Stellen des Werkstück sowie der Pumpe und der sonstigen Einrichtungen sehr gering. Dadurch verlängert sich deren Lebensdauer.Basically, edges of any kind can be used on outer contours or inner contours are rounded by means of a body 15 when the flow velocity in the region of the edges 5 or 16 is sufficiently high. Since the flow rate of the liquid is only in the range of. Edge 5 or 16 must be high, the removal of erosive fluid at the other points of the workpiece and the pump and other facilities is very low. This prolongs their life.

Claims (6)

  1. Method of rounding edges and of deburring edges, characterized by the following method step:
    - causing an erosive fluid to flow around the edge (6, 16) to be rounded, there being a pressure difference of 50 bar to 140 bar between the pressures of the erosive fluid before and after flowing around the edge to be rounded, and the flow velocity of the fluid in the region of the edge (6, 16) to be rounded being increased relative to the average flow velocity of the fluid, characterized in that a body (15) is introduced into the fluid, the surface of this body (15) forming a gap with the edge (16) to be rounded.
  2. Method according to Claim 1, characterized in that the flow direction of the fluid and the longitudinal axis of the edge to be rounded enclose an angle, in particular of 90°.
  3. Method according to either of the preceding claims, characterized in that the erosive fluid used is a suspension of an abrasive in oil.
  4. Arrangement for carrying out the method according to one of Claims 1 to 3, comprising a delivery pump for the erosive fluid, the delivery pump having a delivery pressure of between 50 bar and 140 bar, and comprising a hydraulic connection between delivery pump and a component (1, 11) whose edge (6, 16) is to be rounded, characterized in that a body (15) is present which forms a gap with the edge (6, 16) to be rounded.
  5. Arrangement according to Claim 4, characterized in that a collecting device is present for collecting the fluid.
  6. Arrangement according to either of Claims 4 or 5, characterized in that the fluid is circulated.
EP00987051A 1999-11-04 2000-11-01 Method and device for rounding edges Expired - Lifetime EP1180068B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19953131A DE19953131A1 (en) 1999-11-04 1999-11-04 Method and device for rounding edges
DE19953131 1999-11-04
PCT/DE2000/003832 WO2001032358A2 (en) 1999-11-04 2000-11-01 Method and device for rounding edges

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EP1180068A2 EP1180068A2 (en) 2002-02-20
EP1180068B1 true EP1180068B1 (en) 2006-06-21

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EP (1) EP1180068B1 (en)
JP (1) JP2003512939A (en)
BR (1) BR0007298B1 (en)
CZ (1) CZ302534B6 (en)
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WO (1) WO2001032358A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450042B1 (en) * 2000-03-02 2002-09-17 Micro Motion, Inc. Apparatus for and a method of fabricating a coriolis flowmeter formed primarily of plastic
DE10226799A1 (en) * 2002-06-15 2004-01-08 Robert Bosch Gmbh Fuel injection system involves injector with body having crossways entry hole and longitudinal bore
JP3681714B2 (en) * 2002-06-18 2005-08-10 株式会社不二精機製造所 Blasting method for crossing long hole inside member
DE10230170B3 (en) * 2002-07-04 2004-03-04 Siemens Ag Method and device for hydro-erosively rounding an edge of a component
DE10260302A1 (en) 2002-12-20 2004-07-15 Siemens Ag Method for processing an edge of a high-pressure-resistant component, in particular for hydro-erosively rounding an edge, and device therefor
DE10353168A1 (en) * 2003-11-14 2005-06-23 Robert Bosch Gmbh Method and device for hydroerosive rounding of bore transitions
DE102012001926A1 (en) * 2012-02-02 2013-08-08 Benteler Automobiltechnik Gmbh Fuel rail
DE102013113030A1 (en) 2013-03-28 2014-10-02 Freiberger Compound Materials Gmbh Method for edge rounding of semiconductor wafers

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005549A (en) * 1975-07-28 1977-02-01 Dynetics Corporation Abrasive flow machining method and tooling
JPS6031628B2 (en) * 1981-08-28 1985-07-23 株式会社神戸製鋼所 Pipe internal cleaning device
US5125191A (en) * 1982-09-08 1992-06-30 Extrude Hone Corporation Abrasive flow machining with an in situ viscous plastic medium
DD294891A5 (en) * 1990-06-05 1991-10-17 Maschinenfabrik Sangershausen Gmbh,De DEVICE FOR DISCHARGING SMALL HOLES
ATE237430T1 (en) * 1995-08-04 2003-05-15 Dynetics Corp METHOD AND DEVICE FOR PROCESSING AN OPENING USING AN ABRASIVE LIQUID
US5964644A (en) * 1996-03-01 1999-10-12 Extrude Hone Corporation Abrasive jet stream polishing
JPH10337649A (en) * 1997-06-05 1998-12-22 Nissan Motor Co Ltd Processing method and device of injector nozzle using abrasive grain fluid
US6273787B1 (en) * 1998-08-26 2001-08-14 Extrude Hone Corp Abrasive polishing method, apparatus and composition
US6086459A (en) * 1999-04-07 2000-07-11 Fraisa Sa Device for deburring edges on an object
US6227942B1 (en) * 1999-04-21 2001-05-08 H-Semitran Llc Ferrofluidic finishing

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BR0007298B1 (en) 2013-02-05
BR0007298A (en) 2001-10-16
CZ302534B6 (en) 2011-07-07
JP2003512939A (en) 2003-04-08
DE50013056D1 (en) 2006-08-03
US6540589B1 (en) 2003-04-01
WO2001032358A2 (en) 2001-05-10
EP1180068A2 (en) 2002-02-20
WO2001032358A3 (en) 2001-11-22
CZ20012442A3 (en) 2002-05-15

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