EP2696155B1 - Method and device for UV curing - Google Patents

Method and device for UV curing Download PDF

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Publication number
EP2696155B1
EP2696155B1 EP20120005745 EP12005745A EP2696155B1 EP 2696155 B1 EP2696155 B1 EP 2696155B1 EP 20120005745 EP20120005745 EP 20120005745 EP 12005745 A EP12005745 A EP 12005745A EP 2696155 B1 EP2696155 B1 EP 2696155B1
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EP
European Patent Office
Prior art keywords
workpiece
passage
channel
inert gas
cavity
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Not-in-force
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EP20120005745
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German (de)
French (fr)
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EP2696155A1 (en
Inventor
Josef Wallner
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.)
Sturm Maschinen und Anlagenbau GmbH
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Sturm Maschinen und Anlagenbau GmbH
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Application filed by Sturm Maschinen und Anlagenbau GmbH filed Critical Sturm Maschinen und Anlagenbau GmbH
Priority to EP20120005745 priority Critical patent/EP2696155B1/en
Priority to ES12005745.0T priority patent/ES2542639T3/en
Priority to PCT/EP2013/064230 priority patent/WO2014023493A1/en
Publication of EP2696155A1 publication Critical patent/EP2696155A1/en
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Publication of EP2696155B1 publication Critical patent/EP2696155B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases

Definitions

  • the invention relates to a method and apparatus for UV curing a painted workpiece.
  • UV-curable coatings and coatings for the surface treatment of workpieces have long been known. Compared to solvent-based paints such UV-curable coatings provide manufacturing technology, economic and environmental benefits. For curing such a paint, it is necessary that the applied paint is irradiated by means of UV light in an oxygen-free or at least oxygen-poor environment, so that it hardens after a predetermined time.
  • a method and a device are known in which a workpiece is moved into an inert gas chamber which is filled with an inert gas more easily than air.
  • a proposed oblique retraction of the workpiece in the protective gas atmosphere is to be achieved that as little oxygen is added to the filled with inert gas irradiation chamber.
  • For an excessive proportion of oxygen in the protective gas atmosphere during irradiation can lead to impairment of the UV curing of the paint. In the worst case, with insufficient curing, the workpiece can be rejected.
  • the EP 1 413 416 A2 describes a device for UV curing painted workpieces.
  • An industrial robot thereby performs a UV radiation device within a blasting chamber, in which the workpiece is received.
  • a purging device supplies inert gas via the UV radiation device.
  • the invention has for its object to provide a method and an apparatus with which workpieces with a cavity and at least one channel-like passage are reliably undergoing UV curing of a paint.
  • a basic idea of the invention can be seen not simply to arrange a workpiece for UV irradiation in an inert gas irradiation chamber. Rather, a workpiece having an internal cavity with at least one inlet opening and at least one channel-like passage is arranged and covered so that targeted inert gas is introduced via the access opening into the cavity under pressure, so that the inert gas through the left open channel-like passage or the passages of flows inside out.
  • the workpiece with Its critical workpiece areas are flushed with inert gas, so to speak. This actively removes oxygen within the cavity, and particularly in undercut, thin channel-like passages.
  • the workpiece may be surrounded on its outside by an oxygen atmosphere or preferably by a protective gas atmosphere with the inert gas.
  • UV irradiation of the wall regions of the cavity and of the channel-like passage provided with a UV varnish can take place.
  • a preferred embodiment of the invention is that the UV radiation is generated with a UV radiation device which has at least one UV emitter in the cavity and / or outside of the workpiece.
  • UV emitters are arranged both within the workpiece and outside of the workpiece.
  • at least one UV radiator is aligned in alignment with the at least one channel-like passage.
  • a further advantageous variant of the method lies in the fact that not only lacquer is irradiated and hardened by the UV radiation device in the channel-like passage, but also lacquer at further regions of the workpiece.
  • the workpiece can be completely painted on the inside and outside.
  • the UV radiation device is designed so that all painted areas are sufficiently irradiated with UV light.
  • a particularly reliable curing of the UV varnish is advantageously achieved in that the inner cavity and the at least one channel-like passage are first purged with inert gas for a given period of time before the irradiation is started.
  • a rinsing process can initially be carried out for a few seconds, in particular between 1 to 20 seconds.
  • the existing oxygen is purged from the fissured workpiece, with a desired inert gas concentration is set on the workpiece.
  • the inert gas may be CO 2 , nitrogen or another suitable shielding gas which is heavier or lighter than air.
  • a further improvement can be achieved according to the invention in that the workpiece moves at least during the irradiation relative to the UV radiation device, in particular is turned.
  • the movement or the rotation may already be provided during the flushing of the workpiece with inert gas. This supports the discharge of oxygen. By a relative movement between the workpiece and the UV radiation device, this can be formed more efficiently, in particular with less UV emitters.
  • any suitable radiator which emits a light in the UV range can be used to generate the UV radiation.
  • the UV radiation device has at least one UV emitter which comprises at least one UV lamp and / or at least one UV diode.
  • the UV radiation device has at least one UV emitter which comprises at least one UV lamp and / or at least one UV diode.
  • compact UV diodes can be used, in particular for use in narrower internal spaces.
  • high-intensity UV lamps can a light distribution can be additionally achieved by deflecting elements, in particular by a mirror device or by means of a lens focusing.
  • the receiving device has a retaining plate, which is movable, in particular rotatably driven. This is particularly advantageous for rotationally symmetrical workpieces, such as coated brake discs.
  • the holding plate can be configured as a first covering element, which covers a first access opening in the case of a sleeve-shaped workpiece, for example. In certain cases, the supply of the inert gas can be carried out by such a holding plate.
  • At least one cover is designed as a deliverable hood, in which at least one UV lamp is arranged.
  • the access opening can be covered, so that a flushing of the cavity and the passage can take place.
  • one or more UV lamps can be arranged, which are mounted in certain cases even with respect to the hood for better delivery in the cavity movable.
  • the cover element has a sealing element which encloses the access opening.
  • the access opening can thus be closed in a fluid-tight manner.
  • the sealing element is in particular made of a plastic or rubber material, so that at the same time a gentle placement of the cover is made possible on the workpiece.
  • a particularly flexible design is achieved in that the sealing element is adjustable relative to the cover. In this way, a simple adjustment of the cover can be done with changed workpiece dimensions.
  • the sealing element may be sleeve-shaped, which is mounted displaceably and lockably on the cover.
  • At least one UV radiator of the UV radiation device is arranged outside the workpiece and is movable relative to the workpiece.
  • the relative movement may be provided by moving the workpiece and / or by moving the radiator. In this way The number of UV lamps can be achieved, while ensuring complete irradiation of the workpiece.
  • a device 10 for UV curing according to Fig. 1 comprises a receiving device 12 with a rotatable shaft 16 to which an upper holding plate 15 is attached.
  • the holding plate 15 serves to receive a rotationally symmetrical workpiece 1, wherein a lower opening of the workpiece 1 is tightly covered by the disk-shaped holding plate 15.
  • the workpiece 1 is in the illustrated embodiment, a brake disc, the cup-shaped peripheral wall 7 includes an inner cavity 6. Opposite to the holding plate 15, an access opening 8 is provided to the cavity 6. Laterally on the peripheral wall 7 channel-like passages 5 are provided in the workpiece 1, wherein the passages 5 extend approximately radially to the center or rotational axis of the workpiece 1.
  • the workpiece 1 is arranged on the holding plate 15 as a lower cover member 14, that the workpiece 1 rotates together with the holding plate 15 according to the arrow P1 by a motor, not shown.
  • an upper cover element 20 is delivered axially on the upper side of the workpiece 1 according to the arrow P2.
  • the upper cover member 20 has a hood 21 which holds on its underside an annular retaining lip 26 a sleeve-shaped sealing element 24 axially displaceable.
  • the sealing element 24 is preferably made of plastic, in particular a rubber, and has at the top a radially outwardly projecting conical collar 25. This collar 25 serves as an axial stop to prevent slipping out of the sleeve-shaped sealing element 24 from the hood 21.
  • the annular retaining lip 26 is frictionally against the outside of the sealing element 24, so that this element is fixed and at the same time adjustable.
  • hood 21 opens an inlet nozzle 28 for introducing inert gas into the hood 21.
  • the inert gas serves as a protective gas, which is necessary for the reaction of the coating during UV curing as protection against oxygen.
  • inert gas is introduced into the hood 21 via the inlet nozzle 28 under pressure.
  • inert gas is displaced within the hood 21 located air.
  • the air flows from the hood 21 into the cavity 6 of the workpiece 1 and from this radially out through the channel-like passages 5 in the peripheral wall 7. So there is a flushing of the cavity 6 and the narrow channel-like passages 5, which in alignment of the workpiece 1 represent an undercut.
  • the coated wall parts of the workpiece 1 are irradiated by means of a radiation device 30.
  • the radiation device 30 comprises a first UV radiator 32, which is arranged inside the hood 21 or close to the hood 21, so that through the inner UV radiation. Spotlight 32 an inside of the cavity 6 can be irradiated.
  • irradiation takes place radially from the outside via a second outer UV emitter 34, the rays of which are focused and aligned in such a way that they can pass radially into the channel-like passages 5.
  • the hood 21 is again moved axially upward according to the arrow P2 and the workpiece 1 can be removed from the holding plate 15.
  • the receiving device 12 is equal to the device 10 after Fig. 1 educated.
  • a radiation device 30 UV diodes as UV lamps 32a, 34a.
  • a compact, inner UV emitter 32a can be arranged directly inside the cavity 6 and radially opposite to the passages 5.
  • the inner UV emitter 32a is attached via a holding device, not shown, on the inside of the hood 21 as the upper cover member 20.
  • the inner UV emitter 32a can be reset axially to and from the workpiece 1 according to the arrow P2 with the hood 21.
  • the outer radially directed UV emitter 34a is aligned with the UV diodes so that it can also radiate radially into the radially extending passages 5 without focusing.
  • UV light emitting diodes as UV lamps 32a, 34a allows a compact design of the entire apparatus 10, in particular the hood 21. Basically, UV diodes and conventional UV lamps can be combined.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum UV-Härten eines lackierten Werkstückes.The invention relates to a method and apparatus for UV curing a painted workpiece.

Seit langem sind UV-aushärtbare Lacke und Beschichtungen zur Oberflächenbehandlung von Werkstücken bekannt. Gegenüber lösungsmittelhaltigen Lacken bieten derartige UV-aushärtbare Lacke fertigungstechnische, wirtschaftliche und ökologische Vorteile. Zur Aushärtung eines derartigen Lackes ist es erforderlich, dass der aufgebrachte Lack mittels UV-Licht in einer sauerstofffreien oder zumindest sauerstoffarmen Umgebung bestrahlt wird, so dass dieser nach einer vorgegebenen Zeit aushärtet.UV-curable coatings and coatings for the surface treatment of workpieces have long been known. Compared to solvent-based paints such UV-curable coatings provide manufacturing technology, economic and environmental benefits. For curing such a paint, it is necessary that the applied paint is irradiated by means of UV light in an oxygen-free or at least oxygen-poor environment, so that it hardens after a predetermined time.

Ein Verfahren und eine Vorrichtung, bei welcher ein Werkstück in einer Inertgaskammer mit UV-Licht bestrahlt wird, gehen etwa aus der EP 2 058 614 A2 hervor.A method and a device in which a workpiece is irradiated in an inert gas chamber with UV light, go out of about EP 2 058 614 A2 out.

Aus der WO 2007/045442 A1 sind ein Verfahren und eine Vorrichtung bekannt, bei welchen ein Werkstück in eine Inertgaskammer eingefahren wird, welche mit einem Inertgas leichter als Luft gefüllt ist. Durch ein vorgeschlagenes schräges Einfahren des Werkstückes in die Schutzgasatmosphäre soll erreicht werden, dass möglichst wenig Sauerstoff in die mit Schutzgas gefüllte Bestrahlungskammer eingetragen wird. Denn ein übermäßiger Anteil von Sauerstoff in der Schutzgasatmosphäre während der Bestrahlung kann zur Beeinträchtigung der UV-Aushärtung des Lackes führen. Im schlimmsten Fall kann bei ungenügender Aushärtung das Werkstück zum Ausschuss werden.From the WO 2007/045442 A1 For example, a method and a device are known in which a workpiece is moved into an inert gas chamber which is filled with an inert gas more easily than air. By a proposed oblique retraction of the workpiece in the protective gas atmosphere is to be achieved that as little oxygen is added to the filled with inert gas irradiation chamber. For an excessive proportion of oxygen in the protective gas atmosphere during irradiation can lead to impairment of the UV curing of the paint. In the worst case, with insufficient curing, the workpiece can be rejected.

Die EP 1 413 416 A2 beschreibt eine Vorrichtung zum UV-Härten lackierter Werkstücke. Ein Industrieroboter führt dabei eine UV-Strahlungseinrichtung innerhalb einer Strahlkammer, in der das Werkstück aufgenommen wird. Eine Spüleinrichtung führt über die UV-Strahlungseinrichtung Inertgas zu.The EP 1 413 416 A2 describes a device for UV curing painted workpieces. An industrial robot thereby performs a UV radiation device within a blasting chamber, in which the workpiece is received. A purging device supplies inert gas via the UV radiation device.

Die Gefahr der Einbringung von Sauerstoff in die Schutzgasatmosphäre und damit eines übermäßigen Anteiles von Sauerstoff während der Bestrahlung wird durch die Formgebung des Werkstückes erhöht. Denn bei Werkstücken mit zerklüfteter Formgebung und insbesondere kanalartigen Durchgängen besteht zumindest die Gefahr lokal zu geringer Schutzgaskonzentrationen.The risk of introducing oxygen into the inert gas atmosphere and thus an excessive proportion of oxygen during irradiation is due to the Shaping of the workpiece increased. For workpieces with fissured shape and in particular channel-like passages there is at least the danger locally low concentrations of inert gas.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung anzugeben, mit welchen Werkstücke mit einem Hohlraum und mindestens einem kanalartigen Durchgang zuverlässig einer UV-Aushärtung eines Lackes unterziehbar sind.The invention has for its object to provide a method and an apparatus with which workpieces with a cavity and at least one channel-like passage are reliably undergoing UV curing of a paint.

Die Aufgabe wird zum einen durch ein Verfahren mit den Merkmalen des Anspruchs 1 und zum anderen durch eine Vorrichtung mit den Merkmalen des Anspruchs 6 gelöst. Bevorzugte Ausgestaltungen der Erfindung sind in den jeweils abhängigen Ansprüchen angegeben.The object is achieved, on the one hand, by a method having the features of claim 1 and, on the other hand, by a device having the features of claim 6. Preferred embodiments of the invention are specified in the respective dependent claims.

Gemäß der Erfindung ist ein Verfahren zum UV-Härten eines lackierten Werkstückes vorgesehen, welches einen inneren Hohlraum umfasst, welcher teilweise von einer Umfangswand umschlossen ist, welche mindestens eine Zutrittsöffnung zu dem Hohlraum und mindestens einen kanalartigen Durchgang aufweist, welcher sich von dem inneren Hohlraum durch die Umfangswand nach außen erstreckt, mit den Verfahrensschritten:

  • Halten des Werkstückes, wobei die mindestens eine Zutrittsöffnung mit mindestens einem Abdeckelement unter Offenlassen des mindestens einen kanalartigen Durchganges abgedeckt wird,
  • Einleiten eines Inertgases über mindestens ein Abdeckelement in den Hohlraum und Spülen des kanalartigen Durchganges mit dem Inertgas, und
  • Bestrahlen eines Lackes in dem kanalartigen Durchgang mit einer UV-Strahlung während und/oder nach dem Spülen des kanalartigen Durchganges mit Inertgas.
According to the invention there is provided a method of UV curing a painted workpiece comprising an internal cavity partially enclosed by a peripheral wall having at least one access opening to the cavity and at least one channel-like passage extending from the internal cavity the peripheral wall extends outwards, with the method steps:
  • Holding the workpiece, wherein the at least one access opening is covered with at least one cover while leaving open the at least one channel-like passage,
  • Introducing an inert gas via at least one cover element into the cavity and purging the channel-like passage with the inert gas, and
  • Irradiating a paint in the channel-like passage with UV radiation during and / or after purging the channel-like passage with inert gas.

Ein Grundgedanke der Erfindung kann darin gesehen werden, ein Werkstück zur UV-Bestrahlung nicht einfach in einer Bestrahlungskammer mit Inertgas anzuordnen. Vielmehr wird ein Werkstück mit einem inneren Hohlraum mit mindestens einer Zutrittsöffnung und mindestens einem kanalartigen Durchgang so angeordnet und abgedeckt, dass gezielt Inertgas über die Zutrittsöffnung in den Hohlraum unter Druck eingeleitet wird, so dass das Inertgas durch den offen gelassenen kanalartigen Durchgang oder die Durchgänge von innen nach außen strömt. Das Werkstück mit seinen kritischen Werkstückbereichen wird sozusagen mit Inertgas gespült. Hierdurch wird Sauerstoff innerhalb des Hohlraumes und insbesondere in hinterschnittenen dünnen kanalartigen Durchgängen aktiv beseitigt. Das Werkstück kann dabei an seiner Außenseite von Sauerstoffatmosphäre oder vorzugsweise von einer Schutzgasatmosphäre mit dem Inertgas umgeben sein. Während oder anschließend an den Spülvorgang kann eine UV-Bestrahlung der mit einem UV-Lack versehenen Wandbereiche des Hohlraumes und des kanalartigen Durchganges erfolgen.A basic idea of the invention can be seen not simply to arrange a workpiece for UV irradiation in an inert gas irradiation chamber. Rather, a workpiece having an internal cavity with at least one inlet opening and at least one channel-like passage is arranged and covered so that targeted inert gas is introduced via the access opening into the cavity under pressure, so that the inert gas through the left open channel-like passage or the passages of flows inside out. The workpiece with Its critical workpiece areas are flushed with inert gas, so to speak. This actively removes oxygen within the cavity, and particularly in undercut, thin channel-like passages. The workpiece may be surrounded on its outside by an oxygen atmosphere or preferably by a protective gas atmosphere with the inert gas. During or subsequent to the rinsing process, UV irradiation of the wall regions of the cavity and of the channel-like passage provided with a UV varnish can take place.

Eine bevorzugte Ausführungsform der Erfindung besteht darin, dass die UV-Strahlung mit einer UV-Strahlungseinrichtung erzeugt wird, welche mindestens einen UV-Strahler in dem Hohlraum und/oder außerhalb des Werkstückes aufweist. Vorzugsweise sind UV-Strahler sowohl innerhalb des Werkstückes als auch außerhalb des Werkstückes angeordnet. Insbesondere ist zumindest ein UV-Strahler fluchtend zu dem mindestens einen kanalartigen Durchgang ausgerichtet. So kann eine zuverlässige Aushärtung des Lackes auch innerhalb des kanalartigen Durchganges erreicht werden.A preferred embodiment of the invention is that the UV radiation is generated with a UV radiation device which has at least one UV emitter in the cavity and / or outside of the workpiece. Preferably, UV emitters are arranged both within the workpiece and outside of the workpiece. In particular, at least one UV radiator is aligned in alignment with the at least one channel-like passage. Thus, a reliable curing of the paint can also be achieved within the channel-like passage.

Eine weitere vorteilhafte Verfahrensvariante liegt darin, dass durch die UV-Strahlungseinrichtung nicht nur Lack in den kanalartigen Durchgang, sondern auch Lack an weiteren Bereichen des Werkstückes bestrahlt und gehärtet wird. Insbesondere kann das Werkstück vollständig an der Innen- und Außenseite lackiert sein. Die UV-Strahlungseinrichtung ist dabei so ausgestaltet, dass alle lackierten Bereiche hinreichend mit UV-Licht bestrahlt werden.A further advantageous variant of the method lies in the fact that not only lacquer is irradiated and hardened by the UV radiation device in the channel-like passage, but also lacquer at further regions of the workpiece. In particular, the workpiece can be completely painted on the inside and outside. The UV radiation device is designed so that all painted areas are sufficiently irradiated with UV light.

Eine besonders zuverlässige Aushärtung des UV-Lackes wird in vorteilhafter Weise dadurch erreicht, dass der innere Hohlraum und der mindestens eine kanalartige Durchgang zunächst für eine vorgesehene Zeitspanne mit Inertgas gespült werden, bevor mit der Bestrahlung begonnen wird. Insbesondere kann ein Spülvorgang zunächst für einige Sekunden, insbesondere zwischen 1 bis 20 Sekunden, durchgeführt werden. Auf diese Weise wird aus dem zerklüfteten Werkstück der vorhandene Sauerstoff ausgespült, wobei eine gewünschte Inertgaskonzentration am Werkstück eingestellt wird. Das Inertgas kann CO2, Stickstoff oder ein anderes geeignetes Schutzgas sein, welches schwerer oder leichter als Luft ist.A particularly reliable curing of the UV varnish is advantageously achieved in that the inner cavity and the at least one channel-like passage are first purged with inert gas for a given period of time before the irradiation is started. In particular, a rinsing process can initially be carried out for a few seconds, in particular between 1 to 20 seconds. In this way, the existing oxygen is purged from the fissured workpiece, with a desired inert gas concentration is set on the workpiece. The inert gas may be CO 2 , nitrogen or another suitable shielding gas which is heavier or lighter than air.

Eine weitere Verbesserung kann nach der Erfindung dadurch erzielt werden, dass das Werkstück zumindest beim Bestrahlen relativ zur UV-Strahlungseinrichtung bewegt, insbesondere gedreht wird. Das Bewegen beziehungsweise das Drehen kann bereits während der Spülung des Werkstückes mit Inertgas vorgesehen sein. Dies unterstützt den Austrag von Sauerstoff. Durch eine Relativbewegung zwischen Werkstück und der UV-Strahlungseinrichtung kann diese effizienter, insbesondere mit weniger UV-Strahlern ausgebildet werden.A further improvement can be achieved according to the invention in that the workpiece moves at least during the irradiation relative to the UV radiation device, in particular is turned. The movement or the rotation may already be provided during the flushing of the workpiece with inert gas. This supports the discharge of oxygen. By a relative movement between the workpiece and the UV radiation device, this can be formed more efficiently, in particular with less UV emitters.

Die eingangs genannte Aufgabe wird des Weiteren durch eine Vorrichtung zum UV-Härten eines lackierten Werkstückes gelöst, welches einen inneren Hohlraum umfasst, welcher teilweise von einer Umfangswand umschlossen ist, welche zumindest eine Zutrittsöffnung zu dem Hohlraum und mindestens einen kanalartigen Durchgang aufweist, welcher sich von dem inneren Hohlraum durch die Umfangswand nach außen erstreckt, mit

  • einer Aufnahmeeinrichtung, mit welcher das Werkstück gehalten ist, wobei die mindestens eine Zutrittsöffnung über mindestens ein Abdeckelement unter Offenlassen des Durchganges abgedeckt ist,
  • einer Spüleinrichtung, mit welcher über mindestens ein Abdeckelement Inertgas in den inneren Hohlraum einleitbar und der kanalartige Durchgang mit dem Inertgas spülbar ist, und
  • einer UV-Strahlungseinrichtung, mit welcher beim Spülen mit Inertgas zum UV-Härten eines Lackes in dem kanalartigen Durchgang dieser mit UV-Strahlung bestrahlbar ist.
The above-mentioned object is further achieved by a device for UV curing a painted workpiece, which comprises an inner cavity, which is partially enclosed by a peripheral wall having at least one access opening to the cavity and at least one channel-like passage, which differs from the inner cavity extends through the peripheral wall to the outside, with
  • a receiving device, with which the workpiece is held, wherein the at least one access opening is covered by at least one cover element leaving the passage open,
  • a purging device with which inert gas can be introduced into the inner cavity via at least one cover element and the channel-like passage with the inert gas can be purged, and
  • a UV radiation device, with which when flushing with inert gas for UV curing of a paint in the channel-like passage of these can be irradiated with UV radiation.

Mit dieser erfindungsgemäßen Vorrichtung können insbesondere die zuvor beschriebenen Vorteile erreicht und das zuvor beschriebene Verfahren, insbesondere nach einem der Ansprüche 1 bis 5, durchgeführt werden.With this device according to the invention, in particular, the advantages described above can be achieved and the method described above, in particular according to one of claims 1 to 5, performed.

Grundsätzlich kann zum Erzeugen der UV-Strahlung jeder geeignete Strahler eingesetzt werden, welcher ein Licht im UV-Bereich abstrahlt. Besonders bevorzugt ist es nach einer Ausführungsform der Erfindung, dass die UV-Strahlungseinrichtung mindestens einen UV-Strahler aufweist, welcher mindestens eine UV-Lampe und/oder mindestens eine UV-Diode umfasst. Neben herkömmlichen UV-Lampen können insbesondere kompakte UV-Dioden eingesetzt werden, insbesondere für die Verwendung in engeren Innenräumen. Bei der Verwendung lichtstarker UV-Lampen kann eine Lichtverteilung zusätzlich durch Ablenkelemente, insbesondere durch eine Spiegeleinrichtung oder mittels einer Fokussierung durch Linsen erreicht werden.In principle, any suitable radiator which emits a light in the UV range can be used to generate the UV radiation. According to one embodiment of the invention, it is particularly preferred that the UV radiation device has at least one UV emitter which comprises at least one UV lamp and / or at least one UV diode. In addition to conventional UV lamps, in particular compact UV diodes can be used, in particular for use in narrower internal spaces. When using high-intensity UV lamps can a light distribution can be additionally achieved by deflecting elements, in particular by a mirror device or by means of a lens focusing.

Eine gute Halterung des beschichteten Werkstückes wird nach einer weiteren Ausführungsform der Erfindung dadurch erreicht, dass die Aufnahmeeinrichtung einen Halteteller aufweist, welcher bewegbar, insbesondere drehbar angetrieben ist. Dies ist insbesondere für rotationssymmetrische Werkstücke, etwa beschichtete Bremsscheiben, vorteilhaft. Der Halteteller kann dabei gleichzeitig als ein erstes Abdeckelement ausgestaltet sein, welcher etwa bei einem hülsenförmigen Werkstück eine erste Zutrittsöffnung abdeckt. In bestimmten Fällen kann die Zuführung des Inertgases durch einen derartigen Halteteller erfolgen.A good support of the coated workpiece is achieved according to a further embodiment of the invention in that the receiving device has a retaining plate, which is movable, in particular rotatably driven. This is particularly advantageous for rotationally symmetrical workpieces, such as coated brake discs. At the same time, the holding plate can be configured as a first covering element, which covers a first access opening in the case of a sleeve-shaped workpiece, for example. In certain cases, the supply of the inert gas can be carried out by such a holding plate.

Weiterhin ist es nach der Erfindung bevorzugt, dass mindestens ein Abdeckelement als eine zustellbare Haube ausgebildet ist, in welcher mindestens ein UV-Strahler angeordnet ist. Durch Zustellung der Haube kann die Zutrittsöffnung abgedeckt werden, so dass eine Spülung des Hohlraumes und des Durchganges erfolgen kann. Innerhalb der Haube können ein oder mehrere UV-Strahler angeordnet sein, welche in bestimmten Fällen selbst gegenüber der Haube für eine bessere Zustellung in den Hohlraum verfahrbar gelagert sind.Furthermore, it is preferred according to the invention that at least one cover is designed as a deliverable hood, in which at least one UV lamp is arranged. By delivery of the hood, the access opening can be covered, so that a flushing of the cavity and the passage can take place. Within the hood, one or more UV lamps can be arranged, which are mounted in certain cases even with respect to the hood for better delivery in the cavity movable.

Weiterhin ist es nach einer Ausführungsvariante der Erfindung zweckmäßig, dass das Abdeckelement ein Dichtelement aufweist, welches die Zutrittsöffnung umschließt. Vorzugsweise kann so die Zutrittsöffnung fluiddicht abgeschlossen werden. Dies ist aber nicht in jedem Fall zwingend erforderlich. Das Dichtelement ist insbesondere aus einem Kunststoff- oder Gummimaterial, so dass gleichzeitig ein schonendes Aufsetzen des Abdeckelementes auf dem Werkstück ermöglicht wird. Dabei wird nach der Erfindung eine besonders flexible Ausführung dadurch erreicht, dass das Dichtelement gegenüber dem Abdeckelement verstellbar ist. Auf diese Weise kann eine einfache Anpassung des Abdeckelementes bei geänderten Werkstückdimensionen erfolgen. Insbesondere kann das Dichtelement hülsenförmig ausgebildet sein, welches verschiebbar und feststellbar am Abdeckelement gelagert ist.Furthermore, it is expedient according to an embodiment variant of the invention that the cover element has a sealing element which encloses the access opening. Preferably, the access opening can thus be closed in a fluid-tight manner. However, this is not absolutely necessary in every case. The sealing element is in particular made of a plastic or rubber material, so that at the same time a gentle placement of the cover is made possible on the workpiece. In this case, according to the invention, a particularly flexible design is achieved in that the sealing element is adjustable relative to the cover. In this way, a simple adjustment of the cover can be done with changed workpiece dimensions. In particular, the sealing element may be sleeve-shaped, which is mounted displaceably and lockably on the cover.

Weiter ist es nach der Erfindung vorteilhaft, dass mindestens ein UV-Strahler der UV-Strahlungseinrichtung außerhalb des Werkstückes angeordnet und relativ zu dem Werkstück bewegbar ist. Die Relativbewegung kann durch ein Bewegen des Werkstückes und/oder durch ein Bewegen des Strahlers vorgesehen sein. Auf diese Weise kann die Anzahl der UV-Strahler erreicht werden, wobei gleichzeitig eine vollständige Bestrahlung des Werkstückes sichergestellt ist.Furthermore, it is advantageous according to the invention that at least one UV radiator of the UV radiation device is arranged outside the workpiece and is movable relative to the workpiece. The relative movement may be provided by moving the workpiece and / or by moving the radiator. In this way The number of UV lamps can be achieved, while ensuring complete irradiation of the workpiece.

Die Erfindung wird nachfolgend anhand von bevorzugten Ausführungsbeispielen weiter erläutert, welche schematisch in den Zeichnungen dargestellt sind. In den Zeichnungen zeigen:

Fig. 1
eine schematische Querschnittsansicht durch eine erste erfindungsgemäße Vorrichtung mit UV-Lampen; und
Fig. 2
eine schematische Querschnittsansicht durch eine zweite erfindungsgemäße Vorrichtung mit UV-Dioden.
The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated schematically in the drawings. In the drawings show:
Fig. 1
a schematic cross-sectional view through a first device according to the invention with UV lamps; and
Fig. 2
a schematic cross-sectional view through a second device according to the invention with UV diodes.

Eine Vorrichtung 10 zum UV-Härten gemäß Fig. 1 umfasst eine Aufnahmeeinrichtung 12 mit einer drehbaren Welle 16, an welcher ein oberer Halteteller 15 angebracht ist. Der Halteteller 15 dient zum Aufnehmen eines rotationssymmetrischen Werkstückes 1, wobei durch den scheibenförmigen Halteteller 15 eine untere Öffnung des Werkstückes 1 dicht abgedeckt wird.A device 10 for UV curing according to Fig. 1 comprises a receiving device 12 with a rotatable shaft 16 to which an upper holding plate 15 is attached. The holding plate 15 serves to receive a rotationally symmetrical workpiece 1, wherein a lower opening of the workpiece 1 is tightly covered by the disk-shaped holding plate 15.

Das Werkstück 1 ist im dargestellten Ausführungsbeispiel eine Bremsscheibe, dessen topfförmige Umfangswand 7 einen inneren Hohlraum 6 umfasst. Gegenüberliegend zum Halteteller 15 ist eine Zutrittsöffnung 8 zum Hohlraum 6 vorgesehen. Seitlich an der Umfangswand 7 sind kanalartige Durchgänge 5 im Werkstück 1 vorgesehen, wobei die Durchgänge 5 etwa radial zur Mitten- oder Drehachse des Werkstückes 1 verlaufen. Das Werkstück 1 ist so auf dem Halteteller 15 als unteres Abdeckelement 14 angeordnet, dass sich das Werkstück 1 gemeinsam mit dem Halteteller 15 entsprechend dem Pfeil P1 durch einen nicht dargestellten Motor dreht.The workpiece 1 is in the illustrated embodiment, a brake disc, the cup-shaped peripheral wall 7 includes an inner cavity 6. Opposite to the holding plate 15, an access opening 8 is provided to the cavity 6. Laterally on the peripheral wall 7 channel-like passages 5 are provided in the workpiece 1, wherein the passages 5 extend approximately radially to the center or rotational axis of the workpiece 1. The workpiece 1 is arranged on the holding plate 15 as a lower cover member 14, that the workpiece 1 rotates together with the holding plate 15 according to the arrow P1 by a motor, not shown.

Vor dem Beginn des UV-Härtens wird auf die Oberseite des Werkstückes 1 ein oberes Abdeckelement 20 gemäß dem Pfeil P2 axial zugestellt.Before the beginning of the UV curing, an upper cover element 20 is delivered axially on the upper side of the workpiece 1 according to the arrow P2.

Das obere Abdeckelement 20 weist eine Haube 21 auf, welche an ihrer Unterseite über eine ringförmige Haltelippe 26 ein hülsenförmiges Dichtelement 24 axial verschiebbar hält. Das Dichtelement 24 ist vorzugsweise aus Kunststoff, insbesondere einem Gummi, ausgebildet und weist an der Oberseite einen radial nach außen vorstehenden konischen Bund 25 auf. Dieser Bund 25 dient als ein Axialanschlag, um ein Herausgleiten des hülsenförmigen Dichtelementes 24 aus der Haube 21 zu verhindern. Die ringförmige Haltelippe 26 liegt kraftschlüssig an der Außenseite des Dichtelementes 24 an, so dass dieses Element fixiert und gleichzeitig verstellbar ist.The upper cover member 20 has a hood 21 which holds on its underside an annular retaining lip 26 a sleeve-shaped sealing element 24 axially displaceable. The sealing element 24 is preferably made of plastic, in particular a rubber, and has at the top a radially outwardly projecting conical collar 25. This collar 25 serves as an axial stop to prevent slipping out of the sleeve-shaped sealing element 24 from the hood 21. The annular retaining lip 26 is frictionally against the outside of the sealing element 24, so that this element is fixed and at the same time adjustable.

In der Haube 21 mündet eine Eintrittsdüse 28 zum Einleiten von Inertgas in die Haube 21. Das Inertgas dient als Schutzgas, welches für die Reaktion der Beschichtung beim UV-Härten als Schutz vor Sauerstoff notwendig ist. Nach dem Aufsetzen der Haube 21 mit dem Dichtelement 24 auf dem Werkstück 1 wird unter Druck Inertgas über die Eintrittsdüse 28 in die Haube 21 eingeleitet. Durch dieses Einleiten von Inertgas wird innerhalb der Haube 21 befindliche Luft verdrängt. Die Luft strömt dabei aus der Haube 21 in den Hohlraum 6 des Werkstückes 1 und aus diesem radial heraus durch die kanalartigen Durchgänge 5 in der Umfangswand 7. Es erfolgt also eine Spülung des Hohlraumes 6 und der engen kanalartigen Durchgänge 5, welche in Ausrichtung des Werkstückes 1 eine Hinterschneidung darstellen. Dieses Spülen erfolgt für eine vorgegebene Zeit, bis vorhandene Luft mit dem unerwünschten Sauerstoffanteil in dem erforderlichen Maße verdrängt ist. Anschließend erfolgt eine Bestrahlung der beschichteten Wandteile des Werkstückes 1 mittels einer Strahlungseinrichtung 30. Die Strahlungseinrichtung 30 umfasst im vorliegenden Fall einen ersten UV-Strahler 32, welcher innerhalb der Haube 21 beziehungsweise dicht an der Haube 21 angeordnet ist, so dass durch den inneren UV-Strahler 32 eine Innenseite des Hohlraumes 6 bestrahlt werden kann. Gleichzeitig erfolgt radial von außen eine Bestrahlung über einen zweiten äußeren UV-Strahler 34, dessen Strahlen so fokussiert und ausgerichtet sind, dass diese radial in die kanalartigen Durchgänge 5 gelangen können. Bei drehendem Werkstück 1 und stillstehenden UV-Strahlern 32, 34 können so alle gewünschten Wandbereiche im Hohlraum 6 und innerhalb der Durchgänge 5 mit UV-Licht bestrahlt werden, so dass ein entsprechend an diesen Wandbereichen aufgebrachter UV-empfindlicher Lack aushärtet.In the hood 21 opens an inlet nozzle 28 for introducing inert gas into the hood 21. The inert gas serves as a protective gas, which is necessary for the reaction of the coating during UV curing as protection against oxygen. After placing the hood 21 with the sealing element 24 on the workpiece 1, inert gas is introduced into the hood 21 via the inlet nozzle 28 under pressure. By this introduction of inert gas is displaced within the hood 21 located air. The air flows from the hood 21 into the cavity 6 of the workpiece 1 and from this radially out through the channel-like passages 5 in the peripheral wall 7. So there is a flushing of the cavity 6 and the narrow channel-like passages 5, which in alignment of the workpiece 1 represent an undercut. This purging takes place for a predetermined time until air present with the unwanted oxygen content has been displaced to the required extent. Subsequently, the coated wall parts of the workpiece 1 are irradiated by means of a radiation device 30. In the present case, the radiation device 30 comprises a first UV radiator 32, which is arranged inside the hood 21 or close to the hood 21, so that through the inner UV radiation. Spotlight 32 an inside of the cavity 6 can be irradiated. At the same time, irradiation takes place radially from the outside via a second outer UV emitter 34, the rays of which are focused and aligned in such a way that they can pass radially into the channel-like passages 5. When rotating the workpiece 1 and stationary UV lamps 32, 34 so all the desired wall areas in the cavity 6 and within the passages 5 can be irradiated with UV light, so that a correspondingly applied to these wall areas UV-sensitive lacquer cures.

Nach Abschluss der Bestrahlung und Aushärtung der Beschichtung wird die Haube 21 entsprechend dem Pfeil P2 wieder axial nach oben gefahren und das Werkstück 1 kann von dem Halteteller 15 entnommen werden.After completion of the irradiation and curing of the coating, the hood 21 is again moved axially upward according to the arrow P2 and the workpiece 1 can be removed from the holding plate 15.

Bei der weiteren Ausführungsform einer erfindungsgemäßen Vorrichtung 10 zum UV-Härten gemäß Fig. 2 ist die Aufnahmeeinrichtung 12 gleich zu der Vorrichtung 10 nach Fig. 1 ausgebildet. In Abwandlung zur Vorrichtung 10 gemäß Fig. 1 werden als Strahlungseinrichtung 30 UV-Dioden als UV-Strahler 32a, 34a eingesetzt. Insbesondere zur Bestrahlung des Innenraumes 6 des Werkstückes 1 kann ein kompakt ausgebildeter, innerer UV-Strahler 32a unmittelbar innerhalb des Hohlraumes 6 und radial gegenüberliegend zu den Durchgängen 5 angeordnet werden. Der innere UV-Strahler 32a ist dabei über eine nicht dargestellte Halteeinrichtung an der Innenseite der Haube 21 als oberes Abdeckelement 20 befestigt. Der innere UV-Strahler 32a kann dabei entsprechend dem Pfeil P2 mit der Haube 21 axial zu und aus dem Werkstück 1 wieder rückgestellt werden. Der äußere radial gerichtete UV-Strahler 34a ist mit den UV-Dioden so ausgerichtet, dass dieser ebenso ohne eine Fokussierung radial in die radial verlaufenden Durchgänge 5 einstrahlen kann.In the further embodiment of a device 10 according to the invention for UV curing according to Fig. 2 the receiving device 12 is equal to the device 10 after Fig. 1 educated. In a modification of the device 10 according to Fig. 1 are used as a radiation device 30 UV diodes as UV lamps 32a, 34a. Especially For irradiating the inner space 6 of the workpiece 1, a compact, inner UV emitter 32a can be arranged directly inside the cavity 6 and radially opposite to the passages 5. The inner UV emitter 32a is attached via a holding device, not shown, on the inside of the hood 21 as the upper cover member 20. The inner UV emitter 32a can be reset axially to and from the workpiece 1 according to the arrow P2 with the hood 21. The outer radially directed UV emitter 34a is aligned with the UV diodes so that it can also radiate radially into the radially extending passages 5 without focusing.

Die Verwendung von UV-Licht abstrahlenden Dioden als UV-Strahler 32a, 34a erlaubt eine kompakte Ausgestaltung der gesamten Vorrichtung 10, insbesondere der Haube 21. Grundsätzlich können UV-Dioden und auch herkömmliche UV-Lampen kombiniert sein.The use of UV light emitting diodes as UV lamps 32a, 34a allows a compact design of the entire apparatus 10, in particular the hood 21. Basically, UV diodes and conventional UV lamps can be combined.

Claims (12)

  1. Method for UV curing a painted workpiece (1) which comprises an internal cavity (6) that is partially enclosed by a circumferential wall (7) having at least one access opening (8) to the cavity (6) and at least one channel-like passage (5) which extends from the internal cavity (6) through the circumferential wall (7) towards the outside, with the method steps:
    - holding the workpiece (1), wherein the at least one access opening (8) is covered by at least one cover element (14, 20) whilst leaving the at least one channel-like passage (5) open,
    - introducing an inert gas via at least one cover element (20) into the cavity (6) and flushing the channel-like passage (5) with the inert gas and
    - irradiating a paint in the channel-like passage (5) with UV radiation during and/or after flushing the channel-like passage (5) with the inert gas.
  2. Method according to claim 1,
    characterized in that
    the UV radiation is generated by a UV radiation means (30) which has at least one UV radiator (32, 34) in the cavity (6) and/or outside the workpiece (1).
  3. Method according to claim 1 or 2,
    characterized in that
    by means of the UV radiation means (30) not only paint in the channel-like passage (5) but also paint on further areas of the workpiece (1) is irradiated and cured.
  4. Method according to any one of claims 1 to 3,
    characterized in that
    the internal cavity (6) and the at least one channel-like passage (5) are initially flushed with inert gas for an intended period of time before commencement of the irradiation.
  5. Method according to any one of claims 1 to 4,
    characterized in that
    the workpiece (1) is moved, in particular rotated, relative to the UV radiation means (30) at least during irradiation.
  6. Device for UV curing a painted workpiece (1) which comprises an internal cavity (6) that is partially enclosed by a circumferential wall (7) having at least one access opening (8) to the cavity (6) and at least one channel-like passage (5) which extends from the internal cavity (6) through the circumferential wall (7) towards the outside, with
    - a receiving means (12), with which the workpiece (1) can be held,
    - at least one cover element (14, 20), by way of which the at least one access opening (8) can be covered whilst leaving the passage (5) open,
    - a flushing means, with which inert gas can be introduced via the at least one cover element (20) into the internal cavity (6) and with which the channel-like passage (5) can be flushed with the inert gas, and
    - a UV radiation means (30), with which, for the purpose of UV curing a paint in the channel-like passage (5), the said paint can be irradiated with UV radiation during flushing with inert gas.
  7. Device according to claim 6,
    characterized in that
    the UV radiation means (30) has at least one UV radiator (32, 34) which comprises at least one UV lamp and/or at least one UV diode.
  8. Device according to claim 6 or 7,
    characterized in that
    the receiving means (12) has a holding plate (15) which is movable, in particular being driven in a rotatable manner.
  9. Device according to any one of claims 6 to 8,
    characterized in that
    at least one cover element (20) is designed as a hood (21) which can be fed and in which at least one UV radiator (32) is arranged.
  10. Device according to any one of claims 6 to 9,
    characterized in that
    the cover element (20) has a sealing element (24) which encloses the access opening (8).
  11. Device according to claim 10,
    characterized in that
    the sealing element (24) is adjustable with respect to the cover element (20).
  12. Device according to any one of claims 6 to 11,
    characterized in that
    at least one UV radiator (34) of the UV radiation means (30) is arranged outside the workpiece (1) and movable relative to the workpiece (1).
EP20120005745 2012-08-07 2012-08-07 Method and device for UV curing Not-in-force EP2696155B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20120005745 EP2696155B1 (en) 2012-08-07 2012-08-07 Method and device for UV curing
ES12005745.0T ES2542639T3 (en) 2012-08-07 2012-08-07 Procedure and device for UV hardening
PCT/EP2013/064230 WO2014023493A1 (en) 2012-08-07 2013-07-05 Method and device for uv curing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120005745 EP2696155B1 (en) 2012-08-07 2012-08-07 Method and device for UV curing

Publications (2)

Publication Number Publication Date
EP2696155A1 EP2696155A1 (en) 2014-02-12
EP2696155B1 true EP2696155B1 (en) 2015-04-29

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ID=46967892

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Country Status (3)

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EP (1) EP2696155B1 (en)
ES (1) ES2542639T3 (en)
WO (1) WO2014023493A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207541A1 (en) * 2002-02-22 2003-09-04 Hoenle Ag Dr Radiation of a target object with ultra violet or visible light, it is shrouded by a sealed holder to give a heavy inert gas atmosphere around the target
EP1413416B1 (en) * 2002-10-25 2012-05-23 Air Liquide Deutschland GmbH Radiation hardening installation
DE102005050371B4 (en) 2005-10-20 2012-08-16 Sturm Maschinenbau Gmbh Plant and method for radiation hardening of a coating of a workpiece under inert gas
DE102007053543B4 (en) 2007-11-09 2012-11-22 Sturm Maschinenbau Gmbh Device for irradiating elements with UV light and method for their operation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities

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EP2696155A1 (en) 2014-02-12
ES2542639T3 (en) 2015-08-07

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