EP1398112B1 - Apparatus and process for jet treatment of the interior surfaces of conduits - Google Patents

Apparatus and process for jet treatment of the interior surfaces of conduits Download PDF

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Publication number
EP1398112B1
EP1398112B1 EP02020267A EP02020267A EP1398112B1 EP 1398112 B1 EP1398112 B1 EP 1398112B1 EP 02020267 A EP02020267 A EP 02020267A EP 02020267 A EP02020267 A EP 02020267A EP 1398112 B1 EP1398112 B1 EP 1398112B1
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EP
European Patent Office
Prior art keywords
tube
channel
wire
wall
stream
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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EP02020267A
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German (de)
French (fr)
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EP1398112A1 (en
Inventor
Erwin Baiker
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Baiker AG
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Baiker AG
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Publication date
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Priority to EP02020267A priority Critical patent/EP1398112B1/en
Priority to DE50204877T priority patent/DE50204877D1/en
Priority to US10/656,831 priority patent/US7178212B2/en
Publication of EP1398112A1 publication Critical patent/EP1398112A1/en
Application granted granted Critical
Publication of EP1398112B1 publication Critical patent/EP1398112B1/en
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    • 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
    • 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
    • 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 device and a method for carrying out a blast treatment of the inner wall of a channel with a granular jet Material according to the preamble of claim 1 and the preamble of Claim 11.
  • the so-called shot peening is a known method of improvement the strength of metallic surfaces; For example, at the Maintenance of aircraft the wing leading edges with a jet of Impacted metal balls. It is already known from US-A-3 485 073 the walls of cavities in metallic objects of a blast treatment undergo the shot peening by means of a longitudinal channel having introduced stiff lance into the cavity; at the front Lanzenende is a so-called inner jet nozzle, in which the Lance longitudinal channel opens and the one inclined relative to the lance axis Has inclined surface, which serves for the deflection of the shot peening, so that this exits the jet nozzle transversely to the longitudinal axis of the lance.
  • This known Although device can be to carry out a blast treatment of Inner wall of straight channels use, but not if such Channel has one or more curves, as in metal pipes
  • the case is, for example, for stabilizers on motor vehicles as well used for the production of camshafts.
  • US-A-4 706 356 discloses only the blast treatment of the interior walls of straight metal pipes by means of an inner jet nozzle of the type described above Art, which is attached to the end of a flexible hose, the the supply of a jet of small metal balls is used. It has been shown that such a device for a blast treatment of the inner walls curved channels is unsuitable.
  • the invention was therefore based on the object, a device with the Features of the preamble of claim 1 to create, with which the Inner walls of channels, which have one or more curves, undergo a blast treatment, in particular the inner walls of at least one bend having metal pipes.
  • the invention proposes, in such a device to use the features of the characterizing part of claim 1, and for preferred embodiments of the device according to the invention recommended a flexible hose, which in particular is a Rubber or plastic hose is, preferably a polyurethane hose.
  • a flexible hose which in particular is a Rubber or plastic hose is, preferably a polyurethane hose.
  • the hose such plastics, the sufficient against the guided through the tube particle beam Resistant, on the other hand, but also sufficiently flexible, as this polyurethane is the case.
  • the hose outer side helically surrounding wire-shaped Element of the device according to the invention is when inserting this device into the canal and during a blast treatment Sliding the hose in the channel the sliding friction between the Channel wall and the hose is reduced, so that this sliding friction clearly is less than when the hose lie flat against the channel wall would; this is especially true when the wire-shaped element is one of the tube wall facing away from rounded tip and / or out a lower sliding friction causing material, in particular from a suitable metal or a suitable low-friction Plastic.
  • US-A-1 504 945 discloses a hose protector in the form of a a tube of helically surrounding wire whose ends are metallic Threaded sockets are attached, which in turn on the hose ends pushed on and attached to the hose.
  • the tube at least almost over its entire, to be introduced into the channel Length provided with the wire-shaped element.
  • the ends of the wire-shaped element are in Hose longitudinal direction held relative to the hose immovable to the Moving the tube in the channel to be treated a shift to avoid the helix on the hose.
  • the diameter of the wire-shaped element at most equal to and preferably smaller than the wall thickness of Hose is.
  • the drawing shows a longitudinal section through the inventive Device and by adjoining parts of a jet treatment device and by a metal pipe to be treated, in which the inventive Institution was introduced.
  • an S-shaped curved metal pipe 10 is shown, whose Inner wall surface should be shot peened to ensure the durability of the Tube to increase load changes.
  • a shot peening into a in the drawing partially represented tube 12 is fed, in which a Support sleeve 14 is screwed.
  • a clamping sleeve 16 screwed so that between an inner cone of this clamping sleeve and an outer cone of Support sleeve 14 clamp a tube 20 of the device according to the invention leaves, with the hose end elastically expanded by the support sleeve 14 becomes.
  • a nozzle body 22 of a jet nozzle 24 attached, wherein the hose end cross-nozzle body with the Hose z. B. can be glued.
  • a deflection piece 26 is used and for example by means of a suitable Adhesive fixed in the nozzle body; this deflector has an opposite the hose axis 20a inclined by 45 ° baffle 26a through which the Balls of the shot peer are deflected by 90 °, so that they the jet nozzle 24 through an outlet opening 22a of the nozzle body 22 in the direction of the arrow A leave and impinge on the inner wall surface of the metal tube 10, when the device according to the invention is inserted into the tube 10.
  • the outer diameter must the nozzle body 22 in the region of its free end clearly be smaller than the inner diameter of the metal tube 10th
  • the particular polyurethane existing hose 20 of the invention Device is covered with a metallic coil spring 30, which do not move as a whole relative to the tube 20 therefore can, because according to the invention, the coil spring ends relative to the tube 20th
  • the commercially available coil spring 30 of a Metal spring wire formed with a circular cross-section wherein the spring wire diameter is smaller than the wall thickness of the tube 20 and - if the Tube 20, unlike shown, is stretched and has no bends -
  • the adjacent each other in the tube longitudinal direction coil spring sections at least almost against each other.
  • the device according to the invention d. H. all parts shown in the drawing (except the tube 10) to the tube axis 20a is rotated and during the blasting process is pulled through the tube 10 or become (but in principle it would be also conceivable, the inventive device during the blasting process insert into the tube 10 and advance in this).
  • spring steel wire 30a could also occur a suitable plastic wire, if the selected one Plastic against the workpiece to be treated to the desired reduction of the sliding friction leads.
  • Device is therefore the flexible hose with a relatively tightly wound Coil spring sheathed, of course, a sufficient flexibility must have, so that the inventive device in the for can insert a jet treatment provided channels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Description

Die Erfindung betrifft eine Einrichtung sowie ein Verfahren zur Durchführung einer Strahlbehandlung der Innenwand eines Kanals mit einem Strahl körnigen Materials nach dem Oberbegriff des Anspruchs 1 bzw. dem Oberbegriff des Anspruchs 11.The invention relates to a device and a method for carrying out a blast treatment of the inner wall of a channel with a granular jet Material according to the preamble of claim 1 and the preamble of Claim 11.

Eine Einrichtung mit dem Merkmalen des Oberbegriffs des Anspruchs 1 geht aus der US-A-4 706 356 hervor welche als nächster Stand der Technik betrachtet wird.An apparatus with the features of the preamble of claim 1 goes from US-A-4,706,356, which is considered to represent the closest prior art.

Das sogenannte Kugelstrahlen ist ein bekanntes Verfahren zur Verbesserung der Festigkeit metallischer Oberflächen; so werden beispielsweise bei der Wartung von Flugzeugen die Tragflügelvorderkanten mit einem Strahl von Metallkugeln beaufschlagt. Aus der US-A-3 485 073 ist es auch schon bekannt, die Wände von Hohlräumen in metallischen Gegenständen einer Strahlbehandlung zu unterziehen, wobei der Kugelstrahl mittels einer einen Längskanal aufweisenden steifen Lanze in den Hohlraum eingeleitet wird; am vorderen Lanzenende befindet sich eine sogenannte Innenstrahldüse, in die der Lanzenlängskanal mündet und die eine gegenüber der Lanzenachse geneigte Schrägfläche aufweist, welche der Umlenkung des Kugelstrahls dient, so daß dieser quer zur Lanzenlängsachse aus der Strahldüse austritt. Diese bekannte Einrichtung läßt sich zwar zur Durchführung einer Strahlbehandlung der Innenwand gerader Kanäle verwenden, nicht jedoch dann, wenn ein solcher Kanal eine oder mehrere Krümmungen aufweist, so wie dies bei Metallrohren der Fall ist, welche beispielsweise für Stabilisatoren an Kraftfahrzeugen sowie für die Herstellung von Nockenwellen verwendet werden.The so-called shot peening is a known method of improvement the strength of metallic surfaces; For example, at the Maintenance of aircraft the wing leading edges with a jet of Impacted metal balls. It is already known from US-A-3 485 073 the walls of cavities in metallic objects of a blast treatment undergo the shot peening by means of a longitudinal channel having introduced stiff lance into the cavity; at the front Lanzenende is a so-called inner jet nozzle, in which the Lance longitudinal channel opens and the one inclined relative to the lance axis Has inclined surface, which serves for the deflection of the shot peening, so that this exits the jet nozzle transversely to the longitudinal axis of the lance. This known Although device can be to carry out a blast treatment of Inner wall of straight channels use, but not if such Channel has one or more curves, as in metal pipes The case is, for example, for stabilizers on motor vehicles as well used for the production of camshafts.

Auch die US-A-4 706 356 offenbart nur die Strahlbehandlung der Innenwände von geraden Metallrohren mit Hilfe einer Innenstrahldüse der vorstehend beschriebenen Art, welche am Ende eines flexiblen Schlauchs angebracht ist, der der Zuführung eines Strahls kleiner Metallkugeln dient. Es hat sich aber gezeigt, daß auch eine solche Einrichtung für eine Strahlbehandlung der Innenwände gekrümmter Kanäle ungeeignet ist.Also US-A-4 706 356 discloses only the blast treatment of the interior walls of straight metal pipes by means of an inner jet nozzle of the type described above Art, which is attached to the end of a flexible hose, the the supply of a jet of small metal balls is used. It has been shown that such a device for a blast treatment of the inner walls curved channels is unsuitable.

Der Erfindung lag deshalb die Aufgabe zugrunde, eine Einrichtung mit den Merkmalen des Oberbegriffs des Anspruchs 1 zu schaffen, mit der sich die Innenwände von Kanälen, welche eine oder mehrere Krümmungen aufweisen, einer Strahlbehandlung unterziehen lassen, insbesondere die Innenwände von wenigstens eine Krümmung aufweisenden Metallrohren.The invention was therefore based on the object, a device with the Features of the preamble of claim 1 to create, with which the Inner walls of channels, which have one or more curves, undergo a blast treatment, in particular the inner walls of at least one bend having metal pipes.

Für diesen Zweck wird erfindungsgemäß vorgeschlagen, bei einer solchen Einrichtung die Merkmale des Kennzeichens des Anspruchs 1 zu verwenden, und für bevorzugte Ausführungsformen der erfindungsgemäßen Einrichtung wird ein flexibler Schlauch empfohlen, bei dem es sich insbesondere um einen Gummi- oder Kunststoffschlauch handelt, bevorzugt um einen Polyurethanschlauch. Generell empfehlen sich für den Schlauch solche Kunststoffe, die gegenüber dem durch den Schlauch geleiteten Partikelstrahl hinreichend widerstandsfähig, andererseits aber auch hinreichend flexibel sind, so wie dies bei Polyurethan der Fall ist.For this purpose, the invention proposes, in such a device to use the features of the characterizing part of claim 1, and for preferred embodiments of the device according to the invention recommended a flexible hose, which in particular is a Rubber or plastic hose is, preferably a polyurethane hose. Generally recommend for the hose such plastics, the sufficient against the guided through the tube particle beam Resistant, on the other hand, but also sufficiently flexible, as this polyurethane is the case.

Durch das die Schlauchaußenseite wendelförmig umgebende drahtförmige Element der erfindungsgemäßen Einrichtung wird beim Einschieben dieser Einrichtung in den Kanal und bei einem im Zuge der Strahlbehandlung stattfindenden Verschieben des Schlauchs im Kanal die Gleitreibung zwischen der Kanalwand und dem Schlauch vermindert, so daß diese Gleitreibung deutlich geringer ist als wenn der Schlauch flächig gegen die Kanalwand anliegen würde; dies gilt insbesondere dann, wenn das drahtförmige Element eine von der Schlauchwand abgewandte abgerundete Kuppe aufweist und/oder aus einem eine geringere Gleitreibung verursachenden Werkstoff besteht, insbesondere aus einem hierfür geeigneten Metall oder einem geeigneten reibungsarmen Kunststoff.By the hose outer side helically surrounding wire-shaped Element of the device according to the invention is when inserting this device into the canal and during a blast treatment Sliding the hose in the channel the sliding friction between the Channel wall and the hose is reduced, so that this sliding friction clearly is less than when the hose lie flat against the channel wall would; this is especially true when the wire-shaped element is one of the tube wall facing away from rounded tip and / or out a lower sliding friction causing material, in particular from a suitable metal or a suitable low-friction Plastic.

Aus der EP-A-0 882 923 ergeben sich Mittel, mit deren Hilfe sich die Reibung zwischen einem Schlauch und einer Fläche, über die der Schlauch gezogen werden soll, vermindern läßt, wobei diese Mittel die Gestalt von mit reibungsmindernden Vorsprüngen versehenen Manschetten haben, welche in erheblichen Abständen voneinander auf dem Schlauch angebracht sind. Als Anwendungsgebiet werden zur Betankung von Flugzeugen verwendete Kraftstoffschläuche genannt, welche über ein Rollfeld gezogen werden müssen.From EP-A-0 882 923 there are means by means of which the friction between a hose and a surface over which the hose is pulled is to diminish, whereby these agents take the form of having friction-reducing Projections have provided cuffs, which in considerable Are spaced from each other on the hose. As application area are fuel hoses used to refuel aircraft called, which must be pulled over a tarmac.

Schließlich offenbart die US-A-1 504 945 einen Schlauchschutz in Form eines einen Schlauch wendelförmig umgebenden Drahts, dessen Enden an metallischen Gewindemuffen befestigt sind, welche ihrerseits auf die Schlauchenden aufgeschoben und am Schlauch befestigt sind.Finally, US-A-1 504 945 discloses a hose protector in the form of a a tube of helically surrounding wire whose ends are metallic Threaded sockets are attached, which in turn on the hose ends pushed on and attached to the hose.

Bei bevorzugten Ausführungsformen der erfindungsgemäßen Einrichtung ist der Schlauch zumindest nahezu über seine gesamte, in den Kanal einzuführende Länge mit dem drahtförmigen Element versehen.In preferred embodiments of the device according to the invention the tube at least almost over its entire, to be introduced into the channel Length provided with the wire-shaped element.

Handelt es sich bei dem drahtförmigen Element um ein separates Bauteil, wie dies zu bevorzugen ist, sind die Enden des drahtförmigen Elements in Schlauchlängsrichtung relativ zum Schlauch unverschiebbar gehalten, um beim Verschieben des Schlauchs in dem zu behandelnden Kanal eine Verschiebung der Wendel auf dem Schlauch zu vermeiden.Is it the wire-shaped element is a separate component, such as this is preferable, the ends of the wire-shaped element are in Hose longitudinal direction held relative to the hose immovable to the Moving the tube in the channel to be treated a shift to avoid the helix on the hose.

Besonders bevorzugt werden Ausführungsformen, bei denen das drahtförmige Element von einer den Schlauch umfassenden und auf diesen aufgeschobenen Metall- oder Kunststoff-Schraubenfeder gebildet wird. Particularly preferred are embodiments in which the wire-shaped Element of a hose comprehensive and deferred to this Metal or plastic coil spring is formed.

Um die Flexibilität des Schlauchs zumindest nicht nennenswert zu beeinträchtigen, ist es vorteilhaft, wenn der Durchmesser des drahtförmigen Elements höchstens gleich der und vorzugsweise kleiner als die Wandstärke des Schlauchs ist.At least not to significantly affect the flexibility of the hose, It is advantageous if the diameter of the wire-shaped element at most equal to and preferably smaller than the wall thickness of Hose is.

Damit auch bei relativ stark gekrümmten Kanälen sichergestellt werden kann, daß der Schlauch nicht mit der Kanalwand in Kontakt kommt, zeichnet sich eine besonders vorteilhafte Ausführungsform der erfindungsgemäßen Einrichtung dadurch aus, daß bei geradlinig verlaufendem Schlauch der Abstand einander in Schlauchlängsrichtung benachbarter Schraubenfederabschnitte ungefähr gleich oder kleiner als der Durchmesser des Federdrahts ist, und besonders bevorzugt werden Ausführungsformen, bei denen bei geradem Schlauch einander in Schlauchlängsrichtung benachbarte Schraubenfederabschnitte gegeneinander anliegen.So that even with relatively strongly curved channels can be ensured that the hose does not come into contact with the duct wall is characterized a particularly advantageous embodiment of the device according to the invention characterized in that when straight running hose, the distance from each other in the tube longitudinal direction of adjacent coil spring sections approximately is equal to or smaller than the diameter of the spring wire, and especially embodiments are preferred in which when straight Hose each other in the tube longitudinal direction adjacent coil spring sections lie against each other.

Ferner wird gemäß der Erfindung ein Verfahren vorgeschlagen, wie es der Anspruch 11 definiert, wonach die erfindungsgemäße Einrichtung in den Kanal eingeführt und während der Strahlbehandlung um die Schlauchachse gedreht sowie entlang des Kanals verschoben wird.Furthermore, a method is proposed according to the invention, as is the claim 11 defined, according to which the device according to the invention in the channel introduced and rotated during the blast treatment around the tube axis and moved along the canal.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der beigefügten zeichnerischen Darstellung sowie der nachfolgenden Beschreibung einer besonders vorteilhaften Ausführungsform der erfindungsgemäßen Einrichtung. Die Zeichnung zeigt einen Längsschnitt durch die erfindungsgemäße Einrichtung und durch an diese angrenzende Teile eines Strahlbehandlungsgeräts sowie durch ein zu behandelndes Metallrohr, in das die erfindungsgemäße Einrichtung eingeführt wurde.Other features, advantages and details of the invention will become apparent the attached drawings and the following description a particularly advantageous embodiment of the invention Facility. The drawing shows a longitudinal section through the inventive Device and by adjoining parts of a jet treatment device and by a metal pipe to be treated, in which the inventive Institution was introduced.

In der Zeichnung ist ein S-förmig gekrümmtes Metallrohr 10 dargestellt, dessen Innenwandfläche kugelgestrahlt werden soll, um die Beständigkeit des Rohrs gegenüber Lastwechseln zu erhöhen.In the drawing, an S-shaped curved metal pipe 10 is shown, whose Inner wall surface should be shot peened to ensure the durability of the Tube to increase load changes.

Von einem nicht dargestellten Kugelstrahlgerät wird ein Kugelstrahl in ein in der Zeichnung teilweise dargestelltes Rohr 12 eingespeist, in welches eine Stützhülse 14 eingeschraubt ist. Auf den in der Zeichnung gezeigten Endbereich des Rohrs 12 läßt sich eine Klemmhülse 16 aufschrauben, so daß sich zwischen einem Innenkonus dieser Klemmhülse und einem Außenkonus der Stützhülse 14 ein Schlauch 20 der erfindungsgemäßen Einrichtung einspannen läßt, wobei das Schlauchende durch die Stützhülse 14 elastisch aufgeweitet wird. From a shot-blasting machine, not shown, a shot peening into a in the drawing partially represented tube 12 is fed, in which a Support sleeve 14 is screwed. On the end area shown in the drawing of the tube 12 can be a clamping sleeve 16 screwed so that between an inner cone of this clamping sleeve and an outer cone of Support sleeve 14 clamp a tube 20 of the device according to the invention leaves, with the hose end elastically expanded by the support sleeve 14 becomes.

Am anderen Ende des Schlauchs 20 ist ein Düsenkörper 22 einer Strahldüse 24 befestigt, wobei der das Schlauchende übergreifende Düsenkörper mit dem Schlauch z. B. verklebt sein kann. In den hülsenförmigen Düsenkörper 22 ist ein Umlenkstück 26 eingesetzt und beispielsweise mittels eines geeigneten Klebstoffs im Düsenkörper festgelegt; dieses Umlenkstück weist eine gegenüber der Schlauchachse 20a um 45° geneigte Prallfläche 26a auf, durch die die Kugeln des Kugelstrahls um 90° umgelenkt werden, so daß sie die Strahldüse 24 durch eine Austrittsöffnung 22a des Düsenkörpers 22 in Richtung des Pfeils A verlassen und auf die Innenwandfläche des Metallrohrs 10 auftreffen, wenn die erfindungsgemäße Einrichtung in das Rohr 10 eingeschoben ist. Um einen Stau der Kugeln im Rohrinneren zu verhindern, muß natürlich der Außendurchmesser des Düsenkörpers 22 im Bereich seines freien Endes deutlich kleiner sein als der Innendurchmesser des Metallrohrs 10.At the other end of the tube 20 is a nozzle body 22 of a jet nozzle 24 attached, wherein the hose end cross-nozzle body with the Hose z. B. can be glued. In the sleeve-shaped nozzle body 22 is a deflection piece 26 is used and for example by means of a suitable Adhesive fixed in the nozzle body; this deflector has an opposite the hose axis 20a inclined by 45 ° baffle 26a through which the Balls of the shot peer are deflected by 90 °, so that they the jet nozzle 24 through an outlet opening 22a of the nozzle body 22 in the direction of the arrow A leave and impinge on the inner wall surface of the metal tube 10, when the device according to the invention is inserted into the tube 10. To one To prevent congestion of the balls inside the tube, of course, the outer diameter must the nozzle body 22 in the region of its free end clearly be smaller than the inner diameter of the metal tube 10th

Der insbesondere aus Polyurethan bestehende Schlauch 20 der erfindungsgemäßen Einrichtung ist mit einer metallischen Schraubenfeder 30 ummantelt, die sich als Ganzes gegenüber dem Schlauch 20 deshalb nicht verschieben kann, weil erfindungsgemäß die Schraubenfederenden relativ zum Schlauch 20 festgelegt sind: Zu diesem Zweck werden die beiden Enden der Schraubenfeder 30 einerseits durch den Düsenkörper 22 und andererseits durch die Klemmhülse 16 elastisch aufgeweitet, außerdem bilden, wie die Zeichnung erkennen läßt, der Düsenkörper 22 und die Klemmhülse 16 auch axiale Anschläge für die Schraubenfeder.The particular polyurethane existing hose 20 of the invention Device is covered with a metallic coil spring 30, which do not move as a whole relative to the tube 20 therefore can, because according to the invention, the coil spring ends relative to the tube 20th For this purpose, the two ends of the coil spring 30 on the one hand by the nozzle body 22 and on the other hand by the Clamping sleeve 16 elastically expanded, also form, as the drawing recognize leaves, the nozzle body 22 and the clamping sleeve 16 and axial stops for the coil spring.

Erfindungsgemäß wird die handelsübliche Schraubenfeder 30 von einem Metallfederdraht mit kreisrundem Querschnitt gebildet, wobei der Federdrahtdurchmesser kleiner als die Wandstärke des Schlauchs 20 ist und - wenn der Schlauch 20, anders als dargestellt, gestreckt ist und keine Krümmungen aufweist - die einander in Schlauchlängsrichtung benachbarten Schraubenfederabschnitte zumindest nahezu gegeneinander anliegen. Auf diese Weise wird sichergestellt, daß die Schraubenfeder 30 die Flexibilität des Schlauchs 20 zumindest nicht nennenswert beeinträchtigt und, wie die Zeichnung deutlich erkennen läßt, auch bei einem verhältnismäßig stark gekrümmten Werkstück die Außenwandfläche des Schlauchs 20 nicht mit der Innenwandfläche des Werkstücks, d. h. des Rohrs 10, in Kontakt kommen kann.According to the invention, the commercially available coil spring 30 of a Metal spring wire formed with a circular cross-section, wherein the spring wire diameter is smaller than the wall thickness of the tube 20 and - if the Tube 20, unlike shown, is stretched and has no bends - The adjacent each other in the tube longitudinal direction coil spring sections at least almost against each other. This way will ensures that the coil spring 30, the flexibility of the tube 20 at least not appreciably affected and, as the drawing clearly recognizes lets, even with a relatively strong curved workpiece Outer wall surface of the tube 20 not with the inner wall surface of the workpiece, d. H. of the tube 10, may come into contact.

Beim Innenstrahlen des Rohrs 10 wird so vorgegangen, daß der Schlauch 20 samt der Schraubenfeder 30 und der Strahldüse 24 in das Rohr 10 eingeschoben wird und während des Kugelstrahlens die erfindungsgemäße Einrichtung, d. h. alle in der Zeichnung dargestellten Teile (außer dem Rohr 10) um die Schlauchachse 20a in Rotation versetzt und während des Strahlvorgangs durch das Rohr 10 gezogen wird bzw. werden (grundsätzlich wäre es aber auch denkbar, die erfindungsgemäße Einrichtung während des Strahlvorgangs in das Rohr 10 einzuschieben und in diesem vorzuschieben).When internal radiation of the tube 10 is performed so that the tube 20th together with the coil spring 30 and the jet nozzle 24 is inserted into the tube 10 and during shot peening, the device according to the invention, d. H. all parts shown in the drawing (except the tube 10) to the tube axis 20a is rotated and during the blasting process is pulled through the tube 10 or become (but in principle it would be also conceivable, the inventive device during the blasting process insert into the tube 10 and advance in this).

An die Stelle des die Schraubenfeder 30 bildenden Federstahldrahts 30a könnte auch ein geeigneter Kunststoffdraht treten, wenn der hierfür ausgewählte Kunststoff gegenüber dem zu behandelnden Werkstück zu der gewünschten Verminderung der Gleitreibung führt.In place of the helical spring 30 forming spring steel wire 30a could also occur a suitable plastic wire, if the selected one Plastic against the workpiece to be treated to the desired reduction of the sliding friction leads.

Bei der dargestellten bevorzugten Ausführungsform der erfindungsgemäßen Einrichtung ist also der flexible Schlauch mit einer verhältnismäßig eng gewickelten Schraubenfeder ummantelt, die natürlich eine hinreichende Flexibilität aufweisen muß, damit sich die erfindungsgemäße Einrichtung in die für eine Strahlbehandlung vorgesehenen Kanäle einschieben läßt.In the illustrated preferred embodiment of the invention Device is therefore the flexible hose with a relatively tightly wound Coil spring sheathed, of course, a sufficient flexibility must have, so that the inventive device in the for can insert a jet treatment provided channels.

Claims (11)

  1. Device for carrying out a particle blasting treatment of the inner wall of a channel with a stream of granular material, in particular, the inner wall of a metal pipe (10) having at least one curvature with a stream of metal balls, wherein the device has a tube (20) for introducing the stream of particles into the channel and a stream deflection and outlet device (24) at the end of the tube on the outlet side for directing the stream of particles against the channel wall, characterized in that the outer side of the tube (20) is surrounded in a spiral shape by a wire-like element (30) reducing the friction between tube and channel wall.
  2. Device as defined in claim 1, characterized in that the tube (20) is flexible.
  3. Device as defined in claim 1 or 2, characterized in that the tube (20) is a polyurethane tube.
  4. Device as defined in any one of claims 1 to 3, characterized in that the wire-like element (50) has a rounded crest facing away from the tube wall.
  5. Device as defined in any one of claims 1 to 4, characterized in that the tube (20) is provided with the wire-like element (30) at least approximately over its entire length to be introduced into the channel.
  6. Device as defined in any one of claims 1 to 5, characterized in that the ends of the wire-like element (30) are held so as to be non-displaceable relative to the tube (20) in a longitudinal direction of the tube.
  7. Device as defined in any one of claims 1 to 6, characterized in that the diameter of the wire-like element (30) is at the most equal to and preferably smaller than the thickness of the wall of the tube (20).
  8. Device as defined in any one of claims 1 to 7, characterized in that the wire-like element is formed by a helical spring (30) enclosing the tube (20).
  9. Device as defined in claim 8, characterized in that the distance between sections of the helical spring adjacent to one another in a longitudinal direction of the tube is approximately the same as or smaller than the diameter of the spring wire (30a) when a tube (20) extends in a straight line.
  10. Device as defined in claim 9, characterized in that sections of the helical spring adjacent to one another in a longitudinal direction of the tube abut on one another when a tube (20) extends in a straight line.
  11. Process for carrying out a particle blasting treatment of the inner wall of a channel with a stream of granular material, in particular, the inner wall of a metal pipe having at least one curvature with a stream of metal balls, characterized in that a device as defined in any one of claims 1 to 10 is introduced into the channel and is turned about the tube axis (20a) as well as moved along the channel during the particle blasting treatment.
EP02020267A 2002-09-11 2002-09-11 Apparatus and process for jet treatment of the interior surfaces of conduits Expired - Lifetime EP1398112B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP02020267A EP1398112B1 (en) 2002-09-11 2002-09-11 Apparatus and process for jet treatment of the interior surfaces of conduits
DE50204877T DE50204877D1 (en) 2002-09-11 2002-09-11 Device and method for blasting of internal channel walls
US10/656,831 US7178212B2 (en) 2002-09-11 2003-09-05 Device and method for the blasting treatment of channel inner walls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02020267A EP1398112B1 (en) 2002-09-11 2002-09-11 Apparatus and process for jet treatment of the interior surfaces of conduits

Publications (2)

Publication Number Publication Date
EP1398112A1 EP1398112A1 (en) 2004-03-17
EP1398112B1 true EP1398112B1 (en) 2005-11-09

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EP02020267A Expired - Lifetime EP1398112B1 (en) 2002-09-11 2002-09-11 Apparatus and process for jet treatment of the interior surfaces of conduits

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US (1) US7178212B2 (en)
EP (1) EP1398112B1 (en)
DE (1) DE50204877D1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7671783B2 (en) * 2006-11-20 2010-03-02 Raytheon Company Radar reflector
JP5066430B2 (en) * 2007-11-20 2012-11-07 日本発條株式会社 Reflective member for shot peening and shot peening method using the same
US11364587B2 (en) * 2018-04-19 2022-06-21 Raytheon Technologies Corporation Flow directors and shields for abrasive flow machining of internal passages
CN110639410A (en) * 2019-09-26 2020-01-03 杨国丽 Batching loading attachment of lithium cell production usefulness
KR102225265B1 (en) * 2019-10-31 2021-03-09 대원강업주식회사 Shot peening device for inside pipe

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1504945A (en) * 1924-03-24 1924-08-12 William H Dempsey Hose protector
US2770924A (en) * 1954-04-01 1956-11-20 William H Mead Instant stop and start blasting device
US3485073A (en) * 1966-05-10 1969-12-23 Metal Improvement Co Internal peening apparatus
US3624967A (en) * 1969-09-02 1971-12-07 Charles E Kamper Peening machine
US4230426A (en) * 1979-03-20 1980-10-28 Allied Industries, Inc. Method for treating conduit to improve flow characteristic and resulting conduit product
US4420852A (en) * 1981-05-08 1983-12-20 David Bowlsby Drain cleaning machines
IN166218B (en) * 1984-11-09 1990-03-31 Framatome & Cie
US4773113A (en) * 1985-10-02 1988-09-27 Russell V Lee Multiple use cleaning apparatus
AUPO711097A0 (en) * 1997-06-02 1997-06-26 National Valve & Engineering Company Pty. Limited Hose protector system
US5933903A (en) * 1997-07-16 1999-08-10 Irwin; Lawrence F. Waste line clean out device with water jet head

Also Published As

Publication number Publication date
DE50204877D1 (en) 2005-12-15
US7178212B2 (en) 2007-02-20
EP1398112A1 (en) 2004-03-17
US20040111852A1 (en) 2004-06-17

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