EP2696155B1 - Procédé et dispositif de durcissement par rayonnement UV - Google Patents

Procédé et dispositif de durcissement par rayonnement UV 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
Authority
EP
European Patent Office
Prior art keywords
workpiece
passage
channel
inert gas
cavity
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.)
Not-in-force
Application number
EP20120005745
Other languages
German (de)
English (en)
Other versions
EP2696155A1 (fr
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
Original Assignee
Sturm Maschinen und Anlagenbau GmbH
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 Sturm Maschinen und Anlagenbau GmbH filed Critical Sturm Maschinen und Anlagenbau GmbH
Priority to EP20120005745 priority Critical patent/EP2696155B1/fr
Priority to ES12005745.0T priority patent/ES2542639T3/es
Priority to PCT/EP2013/064230 priority patent/WO2014023493A1/fr
Publication of EP2696155A1 publication Critical patent/EP2696155A1/fr
Application granted granted Critical
Publication of EP2696155B1 publication Critical patent/EP2696155B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Claims (12)

  1. Procédé de durcissement par rayonnement UV d'une pièce vernie (1) qui comporte une cavité intérieure (6), cette dernière étant en partie entourée par une paroi périphérique (7) qui comprend au moins une ouverture d'accès (8) à la cavité (6) et au moins un passage de type canal (5), ce dernier s'étendant de la cavité intérieure (6) vers l'extérieur à travers la paroi périphérique (7), avec les étapes de procédé suivantes :
    - maintien de la pièce (1), la au moins une ouverture d'accès (8) étant recouverte d'au moins un élément de recouvrement (14, 20) qui laisse ouvert le au moins un passage de type canal (5),
    - introduction d'un gaz inerte dans la cavité (6) par au moins un élément de recouvrement (20) et rinçage du passage de type canal (5) par le gaz inerte, et
    - irradiation d'un vernis dans le passage de type canal (5) au moyen d'un rayonnement UV pendant et/ou après le rinçage du passage de type canal (5) par le gaz inerte.
  2. Procédé selon la revendication 1,
    caractérisé :
    en ce que le rayonnement UV est généré à l'aide d'un dispositif de rayonnement UV (30), qui comprend au moins une source de rayonnement UV (32, 34) dans la cavité (6) et/ou à l'extérieur de la pièce (1).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé :
    en ce que, au moyen du dispositif de rayonnement UV (30), du vernis est irradié et durci non seulement dans le passage de type canal (5), mais aussi dans d'autres zones de la pièce (1).
  4. Procédé selon une des revendications 1 à 3,
    caractérisé :
    en ce que la cavité intérieure (6) et le au moins un passage de type canal (5) sont tout d'abord rincés avec un gaz inerte pendant une durée prédéterminée, avant que l'irradiation ne commence.
  5. Procédé selon une des revendications 1 à 4,
    caractérisé :
    en ce que, au moins pendant l'irradiation, la pièce (1) est déplacée, et plus particulièrement déplacée en rotation, par rapport au dispositif de rayonnement UV (30).
  6. Dispositif de durcissement par rayonnement UV d'une pièce vernie (1) qui comporte une cavité intérieure (6), cette dernière étant en partie entourée par une paroi périphérique (7) qui comprend au moins une ouverture d'accès (8) à la cavité (6) et au moins un passage de type canal (5), ce dernier s'étendant de la cavité intérieure (6) vers l'extérieur à travers la paroi périphérique (7), avec :
    - un dispositif de maintien (12), avec lequel la pièce (1) peut être maintenue,
    - au moins un élément de recouvrement (14, 20), par lequel la au moins une ouverture d'accès (8) peut être recouverte en laissant ouvert le passage (5),
    - un dispositif de rinçage, avec lequel un gaz inerte peut être introduit dans la cavité intérieure (6) par le au moins un élément de recouvrement (20) et le passage de type canal (5) peut être rincé avec le gaz inerte, et
    - un dispositif de rayonnement UV (30), avec lequel, pour le durcissement par rayonnement UV d'un vernis dans le passage de type canal (5), ce dernier peut être irradié avec un rayonnement UV pendant le rinçage avec le gaz inerte.
  7. Dispositif selon la revendication 6,
    caractérisé :
    en ce que le dispositif de rayonnement UV (30) comprend au moins une source de rayonnement UV (32, 34), qui comporte au moins une lampe UV et/ou au moins une diode UV.
  8. Dispositif selon la revendication 6 ou 7,
    caractérisé :
    en ce que le dispositif de maintien (12) comprend un plateau de fixation (15), qui est entraînée de façon à pouvoir être mobile, en particulier mobile en rotation.
  9. Dispositif selon une des revendications 6 à 8,
    caractérisé :
    en ce qu'au moins un élément de recouvrement (20) est constitué en formant un capot accessible (21), dans lequel au moins une source de rayonnement UV (32) est disposée.
  10. Dispositif selon une des revendications 6 à 9,
    caractérisé :
    en ce que l'élément de recouvrement (20) comprend un élément d'étanchéité (24) qui entoure l'ouverture d'accès (8).
  11. Dispositif selon la revendication 10,
    caractérisé :
    en ce que l'élément d'étanchéité (24) est réglable par rapport à l'élément de recouvrement (20).
  12. Dispositif selon une des revendications 6 à 11,
    caractérisé :
    en ce qu'au moins une source de rayonnement UV (34) du dispositif de rayonnement UV (30) est disposée à l'extérieur de la pièce (1) et est mobile par rapport à la pièce (1).
EP20120005745 2012-08-07 2012-08-07 Procédé et dispositif de durcissement par rayonnement UV Not-in-force EP2696155B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20120005745 EP2696155B1 (fr) 2012-08-07 2012-08-07 Procédé et dispositif de durcissement par rayonnement UV
ES12005745.0T ES2542639T3 (es) 2012-08-07 2012-08-07 Procedimiento y dispositivo para el endurecimiento UV
PCT/EP2013/064230 WO2014023493A1 (fr) 2012-08-07 2013-07-05 Procédé et dispositif pour un durcissement par uv

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120005745 EP2696155B1 (fr) 2012-08-07 2012-08-07 Procédé et dispositif de durcissement par rayonnement UV

Publications (2)

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

Family

ID=46967892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120005745 Not-in-force EP2696155B1 (fr) 2012-08-07 2012-08-07 Procédé et dispositif de durcissement par rayonnement UV

Country Status (3)

Country Link
EP (1) EP2696155B1 (fr)
ES (1) ES2542639T3 (fr)
WO (1) WO2014023493A1 (fr)

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 (de) * 2002-02-22 2003-09-04 Hoenle Ag Dr Verfahren zum Bestrahlen eines beschichteten bzw. auszuhärtenden Objektes zur Reparatur bzw. Teillackierung sowie Halteeinrichtung zum Durchführen des Verfahrens
EP1413416B1 (fr) * 2002-10-25 2012-05-23 Air Liquide Deutschland GmbH Dispositif de durcissage par rayonnement
DE102005050371B4 (de) 2005-10-20 2012-08-16 Sturm Maschinenbau Gmbh Anlage und Verfahren zum Strahlungshärten einer Beschichtung eines Werkstückes unter Schutzgas
DE102007053543B4 (de) 2007-11-09 2012-11-22 Sturm Maschinenbau Gmbh Vorrichtung zur Bestrahlung von Elementen mit UV-Licht sowie Verfahren zu deren Betrieb

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

Also Published As

Publication number Publication date
EP2696155A1 (fr) 2014-02-12
ES2542639T3 (es) 2015-08-07
WO2014023493A1 (fr) 2014-02-13

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