DE2746714A1 - Electric arc spraying machine nozzle plate - has air passages grouped at intervals around contact nozzles - Google Patents

Electric arc spraying machine nozzle plate - has air passages grouped at intervals around contact nozzles

Info

Publication number
DE2746714A1
DE2746714A1 DE19772746714 DE2746714A DE2746714A1 DE 2746714 A1 DE2746714 A1 DE 2746714A1 DE 19772746714 DE19772746714 DE 19772746714 DE 2746714 A DE2746714 A DE 2746714A DE 2746714 A1 DE2746714 A1 DE 2746714A1
Authority
DE
Germany
Prior art keywords
nozzle plate
air passages
spraying machine
contact nozzles
arc spraying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19772746714
Other languages
German (de)
Inventor
Walter H R Ott
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.)
OTT WALTER HR
Original Assignee
OTT WALTER HR
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OTT WALTER HR filed Critical OTT WALTER HR
Priority to DE19772746714 priority Critical patent/DE2746714A1/en
Publication of DE2746714A1 publication Critical patent/DE2746714A1/en
Withdrawn legal-status Critical Current

Links

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

Abstract

The nozzle plate is for an electric-arc metal spraying machine, and is so shaped that the atomisation air current is in tangental contact on all sides with the spray wires. A number of air passages are formed in the plate at intervals round the contact nozzles. The drillings in the plate can be punched holes, and the plate can be of insulating material, or coated with such material. The air passages can be grouped round one or both contact nozzles.

Description

Düsenplatte für Lichtbogenspritzgeräte Nozzle plate for arc sprayers

Bekannt ist, daß im Lichtbogenspritzverfahren, im Bifilarsystem zwei elektrisch-leitende Spritzdrähte (D), auch als Elektroden bezeichnet, nach dem Abschmelzvorgang im Lichtbogen (L) mittels komprimierter Gase (Zerstäuberdruckluft) verdüst werden. Ferner ist das offene (Abb.3) und das geschlossene (Abbs.2) Dusensystem bekannt.It is known that in the arc spray process, two in the bifilar system Electrically conductive spray wires (D), also known as electrodes, after the melting process atomized in the arc (L) by means of compressed gases (atomizing compressed air). Furthermore, the open (Fig.3) and the closed (Fig.2) nozzle system are known.

Vorzugsweise wird für die Verdüsung eine Einzeldüse eingesetzt (offenes Düsensystem Abb. 3), welche jedoch nicht die Spritzdrähte allseitig erfaßt, da der Zerstäuberluftstrom durch die Spritzdrähte abgelenkt wird. Durch diesen Umstand werden unterschiedlich große Spritzpartikel vom schmelzflüssigen Spritzdraht abgerissen, wodurch die Porosität der Schichten oder Haufwerke zunimmt.A single nozzle is preferably used for atomization (open Nozzle system Fig. 3), which, however, does not cover the spray wires on all sides, as the Atomizing air flow is diverted by the spray wires. By this circumstance spray particles of different sizes are torn off from the molten spray wire, whereby the porosity of the layers or heaps increases.

Große einzelne Spritzpartikel, insbesondere bei Korrosionsschutzschichten aus Aluminium werden bei nachfolgenden Anstrichen freigelegt und führen so zur parziellen Ionenmigration. Besonders für Molybdän- und Aluminium werden Schichten verlangt, die eine feine Struktur aufweisen.Large individual spray particles, especially in the case of corrosion protection layers made of aluminum are exposed in subsequent coatings and thus lead to partial Ion migration. Layers are particularly required for molybdenum and aluminum, which have a fine structure.

Diese feine Struktur läßt sich dann erreichen, wenn der Verdüsungsvorgang in ähnlicher Weise wie beim Flammspritzen durchgeführt wird.This fine structure can then be achieved when the atomization process is carried out in a manner similar to flame spraying.

Die beim Flammspritzen üblichen Zerstäuberluftdüsen können sinngemäß für das Lichtbogenspritzen keine Verwendung finden, es sei denn, daß die Verdüsung erfindungsgemäß über eine Düsenplatte (P) erfolgt. In dieser Düsenplatte können dann, wie beim Flammspritzen, die Zerstäuberluft-Kanäle oder Bohrungen um die Kontaktdüse (K) angeordnet werden.The atomizer air nozzles commonly used in flame spraying can be used accordingly find no use for arc spraying unless atomization takes place according to the invention via a nozzle plate (P). In this nozzle plate you can then, as with flame spraying, the atomizing air channels or holes around the contact nozzle (K) can be arranged.

Erfindungsgemäß werden die beiden Spritzdrähte (D) in gleicher Weise wie beim Flammspritzen durch den Zerstäuberluftstrom durch die Bohrungen (B) allseitig und tangential mit großer Geschwindigkeit berührt und dann das schmelzflüssige Gut mitgerissen, so daß eine gleichmäßige Feinstverdüsung erfolgt.According to the invention, the two spray wires (D) are made in the same way as with flame spraying by the atomizing air flow through the bores (B) on all sides and tangentially touched at great speed and then the molten material entrained, so that an even fine atomization takes place.

Durch die Düsenplatte (P) werden zusammenfassend folgende Vorteile erreicht: 1. Feinstverdüsung des Schmelzgutes durch tangential zum Spritzdraht einwirkende Zerstäuberluft 2. Allseitige Erfassung des Schmelzgutes durch Anordnung der Düsenbohrungen in der Düsenplatte.In summary, the nozzle plate (P) has the following advantages Achieved: 1. Very fine atomization of the material to be melted by acting tangentially to the spray wire Atomizing air 2. Detection of the melt material on all sides by arranging the nozzle bores in the nozzle plate.

3. Prionierung der beiden Kontaktdüsen in der Düsenplatte. 3. Prioning of the two contact nozzles in the nozzle plate.

4. Reduzierung der Zerstäuberluftmenge durch kleine DUnbohrungs-Querschnitte. 4. Reduction of the atomizing air volume through small D-bore cross-sections.

5. Erreichung einer hohen Austrittsgeschwindigkeit aus den Düsenbohrungen. 5. Achieving a high exit speed from the nozzle bores.

Erfindungsgemäß zeigt Abbildung 1 eine beispielsweise Ausführung der beschriebenen Düsenplatte (P) im beispielsweisen Düsensystem.According to the invention, Figure 1 shows an example of the embodiment described nozzle plate (P) in the example of the nozzle system.

Die Abbildung 2 zeigt ein modifiziertes Düsensystem, welches jedoch die optimale Feinstverdüsung nicht erreichen läßt, da der Zerstäuberluftstrom die beiden Spritzdrähte nicht tangential allseitig erfaßt.Figure 2 shows a modified nozzle system, which, however the optimal fine atomization can not be achieved, since the atomizer air flow both spray wires not tangentially captured on all sides.

Die Abbildung 3 zeigt ein offenes Düsensystem mit einer Zerstäuberluftdüse. Der Zerstäuberluftstrom wird auch hier durch die beiden Spritzdrähte abgelenkt, da dieser nicht allseitig tangential die Spritzdrähte berührt. Nach Abbildung 1 wird der Zerstäuberluftstrom tangential und allseitig durch die einzelnen Bohrungen (B) erfaßt, das ist unbedingt notwendig, da Aluminium im Schmelzzustand eine sehr hohe Viscosität aufweist.Figure 3 shows an open nozzle system with an atomizing air nozzle. The atomizing air flow is also deflected here by the two spray wires, since this does not touch the spray wires tangentially on all sides. According to Figure 1 the atomizing air flow is tangential and on all sides through the individual holes (B) detected, this is absolutely necessary, since aluminum in the molten state is a very has high viscosity.

Claims (1)

Patentansprüche Anspruch 19 dadurch gekennzeichnet, daß beim Lichtbogenspritzverfahren zur Erreichung einer Feinstverdüsung eine Düsenplatte Verwendung findet, die es ermöglicht, daß der Zerstäuberluftstrom die beiden Spritzdrähte allseitig tangential erfaßt. In der Düsenplatte sind um die Kontaktdüsen verteilt mehrere Zerstäuberluftdurchgänge.Patent claims claim 19, characterized in that in the arc spraying process to achieve a very fine atomization a nozzle plate is used that it enables the atomizer air flow to tangential the two spray wires on all sides recorded. Several atomizing air passages are distributed around the contact nozzles in the nozzle plate. Anspruch 2, nach Anspruch 1, dadurch gekennzeichnet, daß die Bohrungen in der Düsenplatte auch als Durchstiche in anderer Form und Art ausgebildet sind.Claim 2, according to Claim 1, characterized in that the bores are also formed as punctures in a different shape and type in the nozzle plate. Anspruch 3, nach Anspruch 1, dadurch gekennzeichnet, daß die Düsenplatte aus einem Isolierstoff hergestellt ist.Claim 3, according to Claim 1, characterized in that the nozzle plate is made of an insulating material. Anspruch 4, nach Anspruch 1, dadurch gekennzeichnet, daß die Düsenplatte ganz oder teilweise mit einem Isolierstoff beschichtet ist.Claim 4, according to Claim 1, characterized in that the nozzle plate is completely or partially coated with an insulating material. Anspruch 5, nach Anspruch 1, dadurch gekennzeichnet, daß die Durchgänge für die Zerstäuberluft in der Düsenplatte sowohl um eine als auch um beide Kontaktdüsen gruppiert angeordnet sein können.Claim 5, according to Claim 1, characterized in that the passages for the atomizing air in the nozzle plate around one as well as around both contact nozzles can be arranged in groups.
DE19772746714 1977-10-18 1977-10-18 Electric arc spraying machine nozzle plate - has air passages grouped at intervals around contact nozzles Withdrawn DE2746714A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772746714 DE2746714A1 (en) 1977-10-18 1977-10-18 Electric arc spraying machine nozzle plate - has air passages grouped at intervals around contact nozzles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772746714 DE2746714A1 (en) 1977-10-18 1977-10-18 Electric arc spraying machine nozzle plate - has air passages grouped at intervals around contact nozzles

Publications (1)

Publication Number Publication Date
DE2746714A1 true DE2746714A1 (en) 1979-04-19

Family

ID=6021667

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772746714 Withdrawn DE2746714A1 (en) 1977-10-18 1977-10-18 Electric arc spraying machine nozzle plate - has air passages grouped at intervals around contact nozzles

Country Status (1)

Country Link
DE (1) DE2746714A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998000574A1 (en) * 1996-06-28 1998-01-08 Metalplus (Proprietary) Limited Thermal spraying method and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998000574A1 (en) * 1996-06-28 1998-01-08 Metalplus (Proprietary) Limited Thermal spraying method and apparatus
US6258416B1 (en) 1996-06-28 2001-07-10 Metalspray U.S.A., Inc. Method for forming a coating on a substrate by thermal spraying
US6431464B2 (en) 1996-06-28 2002-08-13 Metalspray U.S.A., Inc. Thermal spraying method and apparatus

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