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EP2279281B1 - Inner burner for electric arc wire spraying - Google Patents

Inner burner for electric arc wire spraying Download PDF

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Publication number
EP2279281B1
EP2279281B1 EP09708709A EP09708709A EP2279281B1 EP 2279281 B1 EP2279281 B1 EP 2279281B1 EP 09708709 A EP09708709 A EP 09708709A EP 09708709 A EP09708709 A EP 09708709A EP 2279281 B1 EP2279281 B1 EP 2279281B1
Authority
EP
European Patent Office
Prior art keywords
sliding contacts
electrodes
guide element
outlet nozzle
sliding
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.)
Active
Application number
EP09708709A
Other languages
German (de)
French (fr)
Other versions
EP2279281A1 (en
Inventor
Albert KÄPPELER
Eyuep Akin ÖZDENIZ
Patrick Izquierdo
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.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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Filing date
Publication date
Application filed by Daimler AG filed Critical Daimler AG
Publication of EP2279281A1 publication Critical patent/EP2279281A1/en
Application granted granted Critical
Publication of EP2279281B1 publication Critical patent/EP2279281B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/22—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc
    • B05B7/222—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc using an arc
    • B05B7/224—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc using an arc the material having originally the shape of a wire, rod or the like
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/131—Wire arc spraying
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3425—Melting or consuming electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3489—Means for contact starting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies

Definitions

  • the present invention relates to an internal burner for the arc wire spraying of cavities, in particular cylinder running surfaces according to the preamble of claim 1.
  • arc wire spraying When so-called arc wire spraying usually two metallic wires are moved by means of controlled wire feed speed over copper sliding contacts through which the power is transmitted in the spray gun. After switching on the wire feed, the two spray wires run towards each other through the wire guide until it comes into contact. At the point of contact, it comes due to the high short-circuit current to heat, causing the coating material melts. A gas stream emerging from a nozzle, usually compressed air, atomises the resulting melt, accelerates the particles and hurls them onto the surface to be coated.
  • Another arc wire burner for arc wire spraying which has two combustion tubes for supplying wire formed as electrodes.
  • the electrodes are guided in the direction of the surface to be coated through the combustion tubes, wherein the wire is guided over a rotatably mounted guide and / or sliding elements having deflecting means, by means of which the wire is deformed in the elastic region.
  • a sliding contact for the transmission of electrical energy to the electrodes is also known, which is biased by a spring against the surface of the electrode.
  • a welding apparatus in which electrical energy is transferred via sliding contacts to an electrode, wherein the sliding contacts are guided by a guide element.
  • the present invention is concerned with the problem of providing for a generic internal burner an improved embodiment, which in particular builds more compact.
  • the invention is based on the general idea of slidably supporting the sliding contacts for transmitting the electrical energy to the electrodes in the axial direction and indirectly biasing in the axial direction via guide elements connected to the sliding contacts, wherein the guide elements are frontally connected to a respective end face of the associated sliding contact and wherein the sliding contacts, the guide elements and at least two supply channels for the supply of electrodes to an outlet nozzle of the internal burner according to the invention are arranged parallel to each other.
  • the two electrodes are designed as burnable wires in an arc.
  • the parallel arrangement of the feed channels, the sliding contacts and the guide elements and the axial bias of the guide elements and connected to the sliding contacts allows in comparison to the prior art, a very compact design, since the spring for biasing the respective sliding contact can be installed similar space advantage, as the Pen in a pen.
  • the sliding contacts were always biased by separately arranged spring means against the electrode, resulting in a significantly increased space requirement.
  • a reduction in the size of the spray head allows use of the internal burner according to the invention in compared to the prior art significantly smaller bore diameters and thus the coating of significantly smaller cavities, especially significantly smaller cylinder treads.
  • the proposed solution is structurally very simple and with a much lower compared to the prior art To realize part number, whereby the inner burner is more cost-effective to produce.
  • the at least two supply channels are angled in the region of the outlet nozzle, wherein the sliding contacts are designed and arranged such that they bias the electrons in the region of the outlet nozzle against a feed channel inner wall.
  • the outlet nozzle, the guide elements, the feed channels and the sliding contacts are part of a replaceable spray head of the internal burner.
  • the summary of above-mentioned components in the interchangeable trained spray head offers the particular advantage to simplify the maintenance of the internal burner significantly, for example, only the spray head must be routinely or replaced if necessary. It is conceivable here that the spray head designed in this way can be connected to the internal burner via simple plug-in or screw connections, so that a mounting or dismounting of the spray head on or from the internal burner can be effected simply and thereby cost-effectively.
  • FIG. 1 an inventive internal burner 1 a spray head 2, wherein the internal burner 1 is connected to a Lichtbogendrahtspritzstrom 3.
  • the inner burner 1 is used for the arc wire spraying of cavities, in particular of cylinder running surfaces 9.
  • a cylinder surface 9 is for example in Fig. 1 represented, wherein at least the spray head 2 of the inner burner 1 is rotatably supported for the coating and preferably the inner burner 1 itself is vertically adjustable, so that a uniform Coating the cylinder surface 9 is possible.
  • a coating of the cavities takes place by melting of burnable in an arc and formed as wires electrodes, which for the transmission of electrical energy with two sliding contacts 4 (see FIG. Fig. 3 ) stay in contact.
  • the sliding contacts 4 were previously biased by orthogonal to the electrodes arranged spring means, for example by means of coil springs against the electrodes, so that a reliable and continuous contact between electrodes on the one hand and sliding contacts 4 on the other hand could be guaranteed.
  • Such arranged spring devices require a not inconsiderable space requirement, which greatly limits the applications of an internal burner, especially at low inner diameters, that is, small cylinders.
  • the internal burner 1 has at least two supply channels 5 for supplying the electrodes to an outlet nozzle 6 on the spray head 2.
  • the sliding contacts 4 are arranged or formed so that they bias the electrodes in the region of the outlet nozzle 6 against a feed channel inner wall.
  • the electrodes are held in position in the region of the outlet nozzle 6 on the one hand by a part of the feed channels 5 and on the other hand by the associated sliding contacts 4, whereby it can be ensured that the two electrodes can be fed to one another in an always predefined and thus exactly aligned position.
  • the sliding contacts 4 are biased in the region of the outlet nozzle 6 substantially orthogonal to the electrodes, wherein the feed channels 5 are formed angled in the region of the outlet nozzle 6. In the feed direction in front of the outlet nozzle 6, the feed channels 5 extend essentially parallel to the sliding contacts 4 or to guide elements 7 arranged on the end of the sliding contacts 4.
  • a spray head 2 of an internal burner 1 according to the invention is shown, wherein the slim shape is clearly visible.
  • This slim shape makes it possible to use the internal burner 1 according to the invention for coating cavities with a diameter of> 60 mm.
  • the sliding contacts 4 are now mounted so as to be displaceable in the axial direction 10 and are connected to a guide element 7 which is also displaceably mounted in the axial direction 10 (cf. Fig. 3 ).
  • the respective guide element 7 similar to the expression in a ballpoint pen, axially biased via in each case at least one associated spring 11 and thereby presses the associated sliding contact 4 against the electrode.
  • Fig. 3 can be seen, while the feed channels 5, the sliding contacts 4 and the guide elements 7 are arranged parallel to each other in the spray head 2, whereby a very compact design of the spray head 2 can be achieved. This makes it possible to use the internal burner 1 according to the invention even with significantly smaller inside diameters, so that even smaller cylinders can be coated with the arc wire spraying method.
  • the two springs 11 Similar to a ballpoint pen, the two springs 11 according to the Fig. 3
  • the respective spring 11 is supported, on the one hand, on a guide-element-side collar 12 and, on the other hand, on a housing 13 of the spray head 2, for example on an unspecified console.
  • springs 11 further springs, not shown, are provided in the region of the inner burner 1, which also bias the two guide elements 7 in the direction of the outlet nozzle 6 and thereby support the two springs 11 in their biasing action.
  • the two sliding contacts 4 are formed as strip-like metal plate, which are connected via corresponding connecting means 8, for example, rivets, with the guide elements 7.
  • the sliding contacts 4 are formed of copper or a copper alloy. Copper has a high electrical conductivity, whereby the electrical resistance can be kept low.
  • the outlet nozzle 6, the guide elements 7, the feed channels 5 and the sliding contacts 4 are part of a total interchangeable spray head 2, whereby a particularly simple and cost-effective maintenance of the internal burner 1 can be ensured.
  • the internal combustion engine 1 provides the following advantages: A cost saving through a reduction in internal burner components, since the previously required spring devices are eliminated, lower operating costs, lower maintenance costs, reduced non-productive time due to lower assembly costs and a widened range of applications due to the compact design.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electromagnetism (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

The invention relates to an inner burner (1) for electric arc wire spraying of hollow spaces, particularly cylinder bearing surfaces (9), comprising two meltable electrodes which are supplied in two feed channels (5) to a discharge nozzle (6) of the inner burner (1). The two electrodes are connected to two sliding contacts (4) for electrical energy transmission. According to the invention, the two sliding contacts (4) are displaceably mounted in the axial direction (10) and are each connected to a guide element (7) which is also displaceably mounted in the axial direction (10). The respective guide element (7) is axially pretensioned via at least one associated spring (11) and thereby presses the sliding contact (4) against the electrode, wherein the feed channels (5), the sliding contacts (4) and the guide elements (7) are arranged parallel to one another in the spraying head (2).

Description

Die vorliegende Erfindung betrifft einen Innenbrenner zum Lichtbogendrahtspritzen von Hohlräumen, insbesondere von Zylinderlaufflächen gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to an internal burner for the arc wire spraying of cavities, in particular cylinder running surfaces according to the preamble of claim 1.

Beim sogenannten Lichtbogendrahtspritzen werden üblicherweise zwei metallische Drähte mittels geregelter Drahtvorschubgeschwindigkeit über kupferne Schleifkontakte, durch welche die Stromübertragung erfolgt, in der Spritzpistole bewegt. Nach dem Einschalten des Drahtvorschubs laufen die beiden Spritzdrähte durch die Drahtführung aufeinander zu, bis es zur Berührung kommt. Im Berührungspunkt kommt es aufgrund des hohen Kurzschlussstromes zur Erwärmung, wodurch der Beschichtungswerkstoff aufschmilzt. Ein aus einer Düse austretender Gasstrom, in der Regel Druckluft, zerstäubt das entstandene Schmelzgut, beschleunigt die Partikel und schleudert sie auf die zu beschichtende Oberfläche.When so-called arc wire spraying usually two metallic wires are moved by means of controlled wire feed speed over copper sliding contacts through which the power is transmitted in the spray gun. After switching on the wire feed, the two spray wires run towards each other through the wire guide until it comes into contact. At the point of contact, it comes due to the high short-circuit current to heat, causing the coating material melts. A gas stream emerging from a nozzle, usually compressed air, atomises the resulting melt, accelerates the particles and hurls them onto the surface to be coated.

Aus der DE 102 43 739 B3 ist ein gattungsgemäßer Innenbrenner zum Lichtbogendrahtspritzen von Hohlräumen mit zumindest zwei zur Aufschmelzung vorgesehenen Elektroden bekannt. Zur Übertragung der elektrischen Energie auf die Elektroden sind zwei Schleifkontakte vorgesehen, welche mittels einer Feder gegen die Oberfläche der zugehörigen Elektrode gedrückt werden.From the DE 102 43 739 B3 a generic internal burner for arc wire spraying of cavities with at least two envisaged for melting electrodes is known. To transmit the electrical energy to the electrodes two sliding contacts are provided, which by means of a spring pressed against the surface of the associated electrode.

Aus der DE 10 2005 012 360 A1 ist ein weiterer Lichtbogendrahtbrenner zum Lichtbogendrahtspritzen bekannt, welcher zwei Brennrohre zur Zuführung von als Draht ausgebildeten Elektroden aufweist. Die Elektroden werden dabei in Richtung der zu beschichtenden Oberfläche durch die Brennrohre geführt, wobei der Draht über eine drehbar gelagerte Führungs- und/oder Gleitelemente aufweisende Umlenkeinrichtung geführt wird, mittels der der Draht im elastischen Bereich verformt wird. Hierbei ist ebenfalls ein Schleifkontakt zur Übertragung von elektrischer Energie auf die Elektroden bekannt, welcher mittels einer Feder gegen die Oberfläche der Elektrode vorgespannt wird.From the DE 10 2005 012 360 A1 Another arc wire burner for arc wire spraying is known, which has two combustion tubes for supplying wire formed as electrodes. The electrodes are guided in the direction of the surface to be coated through the combustion tubes, wherein the wire is guided over a rotatably mounted guide and / or sliding elements having deflecting means, by means of which the wire is deformed in the elastic region. Here, a sliding contact for the transmission of electrical energy to the electrodes is also known, which is biased by a spring against the surface of the electrode.

Aus der GB 455 775 A ist ein Schweißgerät bekannt, bei dem elektrische Energie über Schleifkontakte auf eine Elektrode übertragen wird, wobei die Schleifkontakte von einem Leitelement geführt werden.From the GB 455 775 A a welding apparatus is known in which electrical energy is transferred via sliding contacts to an electrode, wherein the sliding contacts are guided by a guide element.

Insbesondere die zuverlässige Kontaktierung zwischen Elektrode einerseits und den Schleifkontakten andererseits wird im Stand der Technik dadurch erreicht, dass spezielle Federeinrichtungen vorgesehen sind, welche die Schleifkontakte gegen die Elektroden vorspannen. Derartige Federeinrichtungen sind jedoch aufwendig und teuer und benötigen einen nicht zu unterschätzenden Bauraumbedarf.In particular, the reliable contacting between the electrode on the one hand and the sliding contacts on the other hand is achieved in the prior art in that special spring devices are provided which bias the sliding contacts against the electrodes. However, such spring devices are complicated and expensive and require not to be underestimated space requirements.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen gattungsgemäßen Innenbrenner eine verbesserte Ausführungsform anzugeben, welche insbesondere kompakter baut.The present invention is concerned with the problem of providing for a generic internal burner an improved embodiment, which in particular builds more compact.

Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, die Schleifkontakte zur Übertragung der elektrischen Energie auf die Elektroden in Axialrichtung verschiebbar zu lagern und indirekt über mit den Schleifkontakten verbundene Leitelemente in Axialrichtung vorzuspannen, wobei die Leitelemente stirnseitig mit einer jeweiligen Stirnseite des zugehörigen Schleifkontaktes verbunden sind und wobei die Schleifkontakte, die Leitelemente sowie zumindest zwei Zuführungskanäle zur Zuführung von Elektroden zu einer Austrittsdüse des erfindungsgemäßen Innenbrenners parallel zueinander angeordnet sind. Die beiden Elektroden sind dabei als in einem Lichtbogen abbrennbare Drähte ausgebildet. Die parallele Anordnung der Zuführungskanäle, der Schleifkontakte und der Leitelemente sowie die axiale Vorspannung der Leitelemente und verbunden damit der Schleifkontakte ermöglicht im Vergleich zum Stand der Technik eine sehr kompakte Bauform, da sich die Feder zum Vorspannen des jeweiligen Schleifkontaktes ähnlich bauraumgünstig einbauen lässt, wie die Feder in einem Kugelschreiber. Bei vergleichbaren Ausführungsformen im Stand der Technik wurden die Schleifkontakte immer über separat angeordnete Federeinrichtungen gegen die Elektrode vorgespannt, was zu einem deutlich erhöhten Bauraumbedarf führte. Eine Reduktion der Größe des Sprühkopfes erlaubt einen Einsatz des erfindungsgemäßen Innenbrenners in im Vergleich zum Stand der Technik deutlich geringern Bohrungsdurchmessern und damit die Beschichtung von deutlich kleineren Hohlräumen, insbesondere deutlich kleineren Zylinderlaufflächen. Darüber hinaus ist die vorgeschlagene Lösung konstruktiv sehr einfach und mit im Vergleich zum Stand der Technik einer deutlich geringeren Teileanzahl zu realisieren, wodurch der Innenbrenner insgesamt kostengünstiger herstellbar ist.The invention is based on the general idea of slidably supporting the sliding contacts for transmitting the electrical energy to the electrodes in the axial direction and indirectly biasing in the axial direction via guide elements connected to the sliding contacts, wherein the guide elements are frontally connected to a respective end face of the associated sliding contact and wherein the sliding contacts, the guide elements and at least two supply channels for the supply of electrodes to an outlet nozzle of the internal burner according to the invention are arranged parallel to each other. The two electrodes are designed as burnable wires in an arc. The parallel arrangement of the feed channels, the sliding contacts and the guide elements and the axial bias of the guide elements and connected to the sliding contacts allows in comparison to the prior art, a very compact design, since the spring for biasing the respective sliding contact can be installed similar space advantage, as the Pen in a pen. In comparable embodiments in the prior art, the sliding contacts were always biased by separately arranged spring means against the electrode, resulting in a significantly increased space requirement. A reduction in the size of the spray head allows use of the internal burner according to the invention in compared to the prior art significantly smaller bore diameters and thus the coating of significantly smaller cavities, especially significantly smaller cylinder treads. In addition, the proposed solution is structurally very simple and with a much lower compared to the prior art To realize part number, whereby the inner burner is more cost-effective to produce.

Erfindungsgemäß sind die zumindest zwei Zuführungskanäle im Bereich der Austrittsdüse abgewinkelt, wobei die Schleifkontakte so ausgebildet und angeordnet sind, dass sie die Elektronen im Bereich der Austrittsdüse gegen eine Zuführungskanalinnenwand vorspannen. Dies bietet den großen Vorteil, dass die beiden Elektroden im Bereich der Austrittsdüse von den Schleifkontakten einerseits und den Zuführungskanälen andererseits geführt sind und dadurch eine exakt vordefinierbare Position zueinander einnehmen, welche insbesondere für die Qualität des Lichtbogendrahtspritzens von großer Bedeutung ist.According to the invention, the at least two supply channels are angled in the region of the outlet nozzle, wherein the sliding contacts are designed and arranged such that they bias the electrons in the region of the outlet nozzle against a feed channel inner wall. This offers the great advantage that the two electrodes are guided in the region of the outlet nozzle of the sliding contacts on the one hand and the feed channels on the other hand and thereby assume an exactly predefinable position to each other, which is particularly important for the quality of the arc wire spraying of great importance.

Bei einer vorteilhaften Ausführungsform der erfindungsgemäßen Lösung sind die Austrittsdüse, die Leitelemente, die Zuführungskanäle und die Schleifkontakte Bestandteil eines auswechselbaren Sprühkopfes des Innenbrenners. Die Zusammenfassung obengenannter Komponenten in dem als auswechselbar ausgebildeten Sprühkopf bietet den besonderen Vorteil, die Wartung des Innenbrenners deutlich zu vereinfachen, da beispielsweise lediglich der Sprühkopf routinemäßig oder bei Bedarf ausgetauscht werden muss. Denkbar ist hierbei, dass der derart ausgestaltete Sprühkopf über einfache Steck- beziehungsweise Schraubverbindungen mit dem Innenbrenner verbindbar ist, so dass eine Montage beziehungsweise Demontage des Sprühkopfes am beziehungsweise vom Innenbrenner einfach und dadurch kostengünstig zu bewerkstelligen ist.In an advantageous embodiment of the solution according to the invention, the outlet nozzle, the guide elements, the feed channels and the sliding contacts are part of a replaceable spray head of the internal burner. The summary of above-mentioned components in the interchangeable trained spray head offers the particular advantage to simplify the maintenance of the internal burner significantly, for example, only the spray head must be routinely or replaced if necessary. It is conceivable here that the spray head designed in this way can be connected to the internal burner via simple plug-in or screw connections, so that a mounting or dismounting of the spray head on or from the internal burner can be effected simply and thereby cost-effectively.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen. Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings. Preferred embodiments of the invention are illustrated in the drawings and will be explained in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Dabei zeigen, jeweils schematisch,

Fig. 1
eine Ansicht auf einen erfindungsgemäßen Innenbrenner,
Fig. 2
eine Detaildarstellung eines Sprühkopfes des Innenbrenners,
Fig. 3
eine Darstellung wie in Fig. 2, jedoch bei geöffnetem Sprühkopf.
Show, in each case schematically,
Fig. 1
a view of an internal burner according to the invention,
Fig. 2
a detailed representation of a spray head of the internal burner,
Fig. 3
a representation like in Fig. 2 , but with the spray head open.

Entsprechend Fig. 1 weist ein erfindungsgemäßer Innenbrenner 1 einen Sprühkopf 2 auf, wobei der Innenbrenner 1 an eine Lichtbogendrahtspritzanlage 3 angeschlossen ist. Der Innenbrenner 1 wird dabei zum Lichtbogendrahtspritzen von Hohlräumen, insbesondere von Zylinderlaufflächen 9, eingesetzt. Eine derartige Zylinderlauffläche 9 ist beispielsweise in Fig. 1 dargestellt, wobei zu deren Beschichtung zumindest der Sprühkopf 2 des Innenbrenners 1 drehbar gelagert und vorzugsweise der Innenbrenner 1 selbst vertikal verstellbar ist, so dass eine gleichmäßige Beschichtung der Zylinderlauffläche 9 möglich ist. Ein Beschichten der Hohlräume erfolgt dabei durch Aufschmelzen von in einem Lichtbogen abbrennbaren und als Drähten ausgebildeten Elektroden, welche zur Übertragung von elektrischer Energie mit zwei Schleifkontakten 4 (vgl. Fig. 3) in Kontakt stehen. Üblicherweise wurden dabei die Schleifkontakte 4 bisher mittels orthogonal zu den Elektroden angeordneten Federeinrichtungen, beispielsweise mittels Spiralfedern, gegen die Elektroden vorgespannt, so dass ein zuverlässiger und stetiger Kontakt zwischen Elektroden einerseits und Schleifkontakten 4 andererseits gewährleistet werden konnte. Derartig angeordnete Federeinrichtungen benötigen jedoch einen nicht zu unterschätzenden Bauraumbedarf, welcher die Einsatzmöglichkeiten eines Innenbrenners, insbesondere bei geringen Innendurchmessern, das heißt kleinen Zylindern, stark einschränkt.Corresponding Fig. 1 an inventive internal burner 1 a spray head 2, wherein the internal burner 1 is connected to a Lichtbogendrahtspritzanlage 3. The inner burner 1 is used for the arc wire spraying of cavities, in particular of cylinder running surfaces 9. Such a cylinder surface 9 is for example in Fig. 1 represented, wherein at least the spray head 2 of the inner burner 1 is rotatably supported for the coating and preferably the inner burner 1 itself is vertically adjustable, so that a uniform Coating the cylinder surface 9 is possible. A coating of the cavities takes place by melting of burnable in an arc and formed as wires electrodes, which for the transmission of electrical energy with two sliding contacts 4 (see FIG. Fig. 3 ) stay in contact. Usually, the sliding contacts 4 were previously biased by orthogonal to the electrodes arranged spring means, for example by means of coil springs against the electrodes, so that a reliable and continuous contact between electrodes on the one hand and sliding contacts 4 on the other hand could be guaranteed. Such arranged spring devices, however, require a not inconsiderable space requirement, which greatly limits the applications of an internal burner, especially at low inner diameters, that is, small cylinders.

Des weiteren weist der erfindungsgemäße Innenbrenner 1 zumindest zwei Zuführungskanäle 5 zur Zuführung der Elektroden zu einer Austrittsdüse 6 am Sprühkopf 2 auf. Die Schleifkontakte 4 sind dabei so angeordnet beziehungsweise ausgebildet, dass sie die Elektroden im Bereich der Austrittsdüse 6 gegen eine Zuführungskanalinnenwand vorspannen. Dadurch sind die Elektroden im Bereich der Austrittsdüse 6 einerseits von einem Teil der Zuführungskanäle 5 und andererseits von den zugehörigen Schleifkontakten 4 in Lage gehalten, wodurch gewährleistet werden kann, dass die beiden Elektroden in stets vordefinierter und dadurch exakt ausgerichteter Position aufeinander zugeführt werden können. Die Schleifkontakte 4 sind dabei im Bereich der Austrittsdüse 6 im wesentlichen orthogonal gegen die Elektroden vorgespannt, wobei die Zuführungskanäle 5 im Bereich der Austrittsdüse 6 abgewinkelt ausgebildet sind. In Zuführungsrichtung vor der Austrittsdüse 6 verlaufen die Zuführungskanäle 5 im Wesentlichen parallel zu den Schleifkontakten 4 beziehungsweise zu stirnseitig an den Schleifkontakten 4 angeordneten Leitelementen 7.Furthermore, the internal burner 1 according to the invention has at least two supply channels 5 for supplying the electrodes to an outlet nozzle 6 on the spray head 2. The sliding contacts 4 are arranged or formed so that they bias the electrodes in the region of the outlet nozzle 6 against a feed channel inner wall. As a result, the electrodes are held in position in the region of the outlet nozzle 6 on the one hand by a part of the feed channels 5 and on the other hand by the associated sliding contacts 4, whereby it can be ensured that the two electrodes can be fed to one another in an always predefined and thus exactly aligned position. The sliding contacts 4 are biased in the region of the outlet nozzle 6 substantially orthogonal to the electrodes, wherein the feed channels 5 are formed angled in the region of the outlet nozzle 6. In the feed direction in front of the outlet nozzle 6, the feed channels 5 extend essentially parallel to the sliding contacts 4 or to guide elements 7 arranged on the end of the sliding contacts 4.

Gemäß Fig. 2 ist ein Sprühkopf 2 eines erfindungsgemäßen Innenbrenners 1 dargestellt, wobei dessen schlanke Form deutlich zu erkennen ist. Diese schlanke Form ermöglicht es, den erfindungsgemäßen Innenbrenner 1 zum Beschichten von Hohlräumen mit einem Durchmesser von > 60 mm einzusetzen.According to Fig. 2 a spray head 2 of an internal burner 1 according to the invention is shown, wherein the slim shape is clearly visible. This slim shape makes it possible to use the internal burner 1 according to the invention for coating cavities with a diameter of> 60 mm.

Bei dem erfindungsgemäßen Innenbrenner 1 sind nun die Schleifkontakte 4 in Axialrichtung 10 verschiebbar gelagert und mit einem ebenfalls in Axialrichtung 10 verschiebbar gelagerten Leitelement 7 verbunden (vgl. Fig. 3). Dabei ist das jeweilige Leitelement 7, ähnlich der Miene in einem Kugelschreiber, über jeweils zumindest eine zugehörige Feder 11 axial vorgespannt und drückt dadurch den zugehörigen Schleifkontakt 4 gegen die Elektrode. Wie der Fig. 3 zu entnehmen ist, sind dabei die Zuführungskanäle 5, die Schleifkontakte 4 sowie die Leitelemente 7 parallel zueinander im Sprühkopf 2 angeordnet, wodurch eine sehr kompakte Bauweise des Sprühkopfes 2 erreicht werden kann. Dies ermöglicht einen Einsatz des erfindungsgemäßen Innenbrenners 1 auch bei deutlich geringeren Innendurchmessern, so dass auch kleinere Zylinder mit dem Lichtbogendrahtspritzverfahren beschichtet werden können.In the inner burner 1 according to the invention, the sliding contacts 4 are now mounted so as to be displaceable in the axial direction 10 and are connected to a guide element 7 which is also displaceably mounted in the axial direction 10 (cf. Fig. 3 ). In this case, the respective guide element 7, similar to the expression in a ballpoint pen, axially biased via in each case at least one associated spring 11 and thereby presses the associated sliding contact 4 against the electrode. Again Fig. 3 can be seen, while the feed channels 5, the sliding contacts 4 and the guide elements 7 are arranged parallel to each other in the spray head 2, whereby a very compact design of the spray head 2 can be achieved. This makes it possible to use the internal burner 1 according to the invention even with significantly smaller inside diameters, so that even smaller cylinders can be coated with the arc wire spraying method.

Ähnlich wie bei einem Kugelschreiber, sind die beiden Federn 11 gemäß der Fig. 3 als Spiralfedern ausgebildet und winden sich in Umfangsrichtung um das jeweils zugehörige Leitelement 7. Abgestützt ist die jeweilige Feder 11 einerseits an einem leitelementseitigen Kragen 12 und andererseits an einem Gehäuse 13 des Sprühkopfes 2, beispielsweise an einer nicht näher bezeichneten Konsole. Denkbar ist hierbei auch, dass zusätzlich zu den in Fig. 3 gezeigten Federn 11 weitere, nicht gezeigte Federn im Bereich des Innenbrenners 1 vorgesehen sind, welche die beiden Leitelemente 7 ebenfalls in Richtung der Austrittsdüse 6 vorspannen und dadurch die beiden Federn 11 in ihrer Vorspannwirkung unterstützen.Similar to a ballpoint pen, the two springs 11 according to the Fig. 3 The respective spring 11 is supported, on the one hand, on a guide-element-side collar 12 and, on the other hand, on a housing 13 of the spray head 2, for example on an unspecified console. It is also conceivable that in addition to the in Fig. 3 shown springs 11 further springs, not shown, are provided in the region of the inner burner 1, which also bias the two guide elements 7 in the direction of the outlet nozzle 6 and thereby support the two springs 11 in their biasing action.

Gemäß Fig. 3 ist weiter ersichtlich, dass die beiden Schleifkontakte 4 als streifenartige Metallplättchen ausgebildet sind, welche über entsprechende Verbindungsmittel 8, beispielsweise Nieten, mit den Leitelementen 7 verbunden sind.According to Fig. 3 is also apparent that the two sliding contacts 4 are formed as strip-like metal plate, which are connected via corresponding connecting means 8, for example, rivets, with the guide elements 7.

Vorzugsweise sind die Schleifkontakte 4 aus Kupfer oder aus einer Kupferlegierung ausgebildet. Kupfer weist eine hohe elektrische Leitfähigkeit auf, wodurch der elektrische Widerstand gering gehalten werden kann.Preferably, the sliding contacts 4 are formed of copper or a copper alloy. Copper has a high electrical conductivity, whereby the electrical resistance can be kept low.

Zweckmäßig sind die Austrittsdüse 6, die Leitelemente 7, die Zuführungskanäle 5 sowie die Schleifkontakte 4 Bestandteil eines insgesamt auswechselbaren Sprühkopfes 2, wodurch eine besonders einfache und dadurch kostengünstige Wartung des Innenbrenners 1 gewährleistet werden kann.Suitably, the outlet nozzle 6, the guide elements 7, the feed channels 5 and the sliding contacts 4 are part of a total interchangeable spray head 2, whereby a particularly simple and cost-effective maintenance of the internal burner 1 can be ensured.

Generell lassen sich durch den erfindungsgemäßen Innenbrenner 1 folgende Vorteile realisieren: Eine Kosteneinsparung durch eine Reduktion der Innenbrenner-Einzelkomponenten, da die bisher erforderlichen Federeinrichtungen wegfallen, geringere Betriebskosten, geringere Instandhaltungskosten, reduzierte Nebenzeiten durch geringeren Montageaufwand sowie ein verbreitertes Einsatzspektrum aufgrund der kompakten Bauweise.In general, the internal combustion engine 1 according to the invention provides the following advantages: A cost saving through a reduction in internal burner components, since the previously required spring devices are eliminated, lower operating costs, lower maintenance costs, reduced non-productive time due to lower assembly costs and a widened range of applications due to the compact design.

Claims (3)

  1. Internal burner (1) for electric arc wire spraying of cavities, in particular cylinder sliding surfaces (9), comprising
    - at least two electrodes provided for melting, which are designed as wires which can be burned off in an electric arc,
    - at least two feed passages (5) for feeding the electrodes to an outlet nozzle (6) of the internal burner (1),
    - at least two sliding contacts (4) for transmitting electric energy to the electrodes,
    - wherein the feed passages (5) and the sliding contacts (4) are arranged parallel to one another,
    characterised in that
    - the two sliding contacts (4) are mounted to be displaceable in the axial direction (10), each being connected to a guide element (7) which is likewise displaceable in the axial direction (10),
    - in that each guide element (7) is axially preloaded by means of at least one associated spring (11) and therefore preloads the associated sliding contact (4) against the electrode,
    - in that the feed passages (5), the sliding contacts (4) and the guide elements (7) are arranged parallel to one another,
    - in that the feed passages (5) are angled on the region of the outlet nozzle (6),
    - in that the sliding contacts (4) are designed and arranged such that they preload the electrodes against an inner wall of the feed passage in the region of the outlet nozzle (6).
  2. Internal burner according to claim 1,
    characterised in that
    the outlet nozzle (6), the guide elements (7), the feed passages (9) and the sliding contacts (4) are part of an exchangeable spraying head (2).
  3. Internal burner according to claim 2,
    characterised in that
    the spring (11) at each guide element (7) is designed as a spiral spring which is wound around the associated guide element (7) in the circumferential direction, one end being supported on a collar (12) provided on the guide element and the other end being supported on a housing (13) of the spraying head (2).
EP09708709A 2008-02-08 2009-01-08 Inner burner for electric arc wire spraying Active EP2279281B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008008169A DE102008008169A1 (en) 2008-02-08 2008-02-08 Internal burner for electric wire spraying
PCT/EP2009/000058 WO2009097943A1 (en) 2008-02-08 2009-01-08 Inner burner for electric arc wire spraying

Publications (2)

Publication Number Publication Date
EP2279281A1 EP2279281A1 (en) 2011-02-02
EP2279281B1 true EP2279281B1 (en) 2011-07-13

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ID=40436266

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Application Number Title Priority Date Filing Date
EP09708709A Active EP2279281B1 (en) 2008-02-08 2009-01-08 Inner burner for electric arc wire spraying

Country Status (6)

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US (1) US8431856B2 (en)
EP (1) EP2279281B1 (en)
JP (1) JP5370693B2 (en)
AT (1) ATE516382T1 (en)
DE (1) DE102008008169A1 (en)
WO (1) WO2009097943A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201006389D0 (en) * 2010-04-16 2010-06-02 Linde Ag Device for providing a flow of plasma
DE102011114395A1 (en) 2011-09-24 2013-03-28 Daimler Ag Device for thermal coating of internal walls of hollow objects e.g. cylinder bore of internal combustion engine, guides coating material with wires through lateral outlet opening with respect to burner head such that arc is ignited
DE102011120539B4 (en) * 2011-12-08 2020-10-29 Daimler Ag Method for testing a thermal coating system
DE102014008908A1 (en) 2014-06-14 2014-12-04 Daimler Ag Cold gas spraying apparatus and method for coating a component
MX369198B (en) 2016-03-23 2019-10-31 Nissan Motor Thermal spraying torch.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE403295A (en) *
GB455775A (en) * 1935-05-29 1936-10-27 British Thomson Houston Co Ltd Improvements in and relating to apparatus for supplying current to electric welding machines
DE19841619C2 (en) * 1998-09-11 2002-11-28 Daimler Chrysler Ag Material wire for producing wear-resistant coatings from hypereutectic Al / Si alloys by thermal spraying and its use
US6559416B1 (en) * 2000-08-25 2003-05-06 Illinois Tool Works Alternate current path for mig gun
DE10111565C5 (en) * 2001-03-10 2005-07-21 Daimlerchrysler Ag internal burner
DE10243739B3 (en) 2002-09-20 2004-05-19 Daimlerchrysler Ag Arc wire burner
DE102005012360B4 (en) 2005-03-17 2009-09-03 Daimler Ag Arc wire burner

Also Published As

Publication number Publication date
EP2279281A1 (en) 2011-02-02
JP2011511163A (en) 2011-04-07
DE102008008169A1 (en) 2009-08-13
ATE516382T1 (en) 2011-07-15
US8431856B2 (en) 2013-04-30
WO2009097943A1 (en) 2009-08-13
JP5370693B2 (en) 2013-12-18
US20100320175A1 (en) 2010-12-23

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