EP3578297B1 - Device and method for producing a matt surface - Google Patents

Description

The invention relates to a device for matting a surface according to the preamble of patent claim 1. Furthermore, the invention relates to a method for matting a surface with such a device.

Devices for matting glossy surfaces of a vehicle and / or a vehicle component are known in numerous variations. These known devices for matting painted surfaces have roughly cuboid jet nozzles or jet chambers. Here, a jet of blasting media is directed approximately perpendicularly or at an angle well over 60 ° onto the surface to be irradiated. A flat matting of the surface is achieved by a relative movement between the workpiece and the nozzle.

From the DE 10 2015 013 167 A1 a method is known for processing a glossy surface of a vehicle and / or a vehicle component which is coated with a clearcoat layer of a given first layer thickness. In the process, a blasting agent is metered into a carrier air flow generated by negative pressure, conveyed in a hose line system to a jet lance and directed onto a processing surface placed under negative pressure by a blasting chamber, from there returned to the air flow, cleaned and, if necessary, circulated. The acceleration of the blasting medium is generated by the negative pressure and the blasting chamber is shifted on the processing surface, with at least one additional energy pulse being fed to the blasting medium by at least one further gas flow sucked in by the negative pressure and at least under atmospheric pressure Achieving a final speed well above the flow speed of the carrier air flow upstream of a metering point is issued. With the final speed, an energy input into the processing surface is set depending on the parameters type and shape of the processing surface and the blasting agent, degree of loading of the carrier air flow with blasting agent, negative pressure in the carrier air flow, blasting time and blasting temperature, so that about 1 to 50 percent of the given first layer thickness of the clearcoat layer is removed is, whereby the surface of the vehicle and / or the vehicle component is matted and a reduced second layer thickness of the clearcoat layer is formed. To carry out the method, a generic device for matting surfaces is described.

The long duration of the matting process for larger surfaces to be matted can be viewed as disadvantageous in the known device and method for matting a surface, since the area performance of matting results from the relative speed between workpiece and nozzle or blasting chamber.

From the DE 10 2010 009 933 B3 a method for surface treatment of a molding surface of a vulcanization or injection mold is known.

From the WO 98/07549 A1 a device for blasting flat surfaces is known in which the blasting agent exits uniformly from an outlet opening extending over the entire width of the system, whereby a uniform blasting effect is achieved.

From the JP 2017 039195 A a blasting method and a blasting device for forming a three-dimensionally recognizable pattern on a glossy surface are known.

From the GB 681 524 A a device for blasting calendar roller surfaces is known which has a hood, one side of which is open and contoured is to come into engagement with the roller and the other side of which is longitudinally slotted, a jet nozzle extending through the slot and directed towards the roller, an abrasive supply line connected to the nozzle, a vacuum line connected to the hood and comprises means for reciprocating the nozzle in the slot.

From the EP 0 350 965 A2 a generic device suitable for matting a surface is known, as well as a method for blasting the surface. The device comprises a centrifugal blasting head for blasting larger surfaces with abrasive particles conveyed in an air stream. The centrifugal blast head comprises a manually guided blasting chamber to be placed on the surface to be blasted, with a blasting chamber opening which is enclosed by an edge part which can be placed on the surface to be blasted, and with a transparent chamber wall area, a blasting nozzle opening into the blasting chamber and directed towards the blasting chamber opening, and a The outlet nozzle arranged in the blasting chamber for discharging conveying air and used blasting media particles. The jet nozzle is arranged at an acute angle to the plane of the jet chamber opening and essentially to the side of the same on the jet chamber. The outlet connection is arranged essentially opposite the blasting nozzle on the blasting chamber, and the transparent chamber wall area is designed as a viewing window opposite the blasting chamber opening.

The invention is based on the object of providing a device and a method for matting a surface which enable a higher area performance of matting.

This object is achieved by a device for matting a surface with the features of claim 1 and by a method for matting a surface with the features of claim 8. Advantageous configurations with expedient developments of the invention are specified in the dependent claims.

In order to provide a device for matting a surface, which enables a higher area performance of matting, the workpiece and nozzle remain rigid to one another during the irradiation process, with a direction of a jet of abrasive material within a blasting chamber approximately parallel to or at an angle less than 30 ° to the interaction opening and the surface to be matted can be aligned. In addition, the direction of the jet of abrasive material is reversed. By alternately irradiating the surface to be matted in opposite beam directions, the result of the matting can be further improved.

A device for matting a surface is understood below to mean an assembly with a nozzle which has the blasting chamber for irradiating a workpiece with an abrasive radiation material. The blasting chamber has at least one flat interaction opening on at least one of its sides, which is intended to be positively placed on at least one surface to be matted, so that the blasting chamber is thereby closed.

In addition, a method for matting a surface with such a device is proposed. The method comprises the following steps: providing a workpiece with a surface to be matted, placing the device with its flat interaction opening on the area of the surface to be matted, and irradiating the surface with a jet of abrasive material in a first jet direction. The jet of abrasive material is aligned approximately parallel to or at an angle of less than 30 ° to the interaction opening and the surface to be matted. The surface is then irradiated with a jet of abrasive material in a second jet direction, which runs approximately in the opposite direction to the first jet direction. Furthermore, the alternating irradiation of the surface with the jet of abrasive material can be repeated until a desired degree of matting of the surface to be matted is reached.

Embodiments of the invention enable a significantly higher surface output with otherwise the same beam parameters by means of "planar blasting". This means that the entire surface to be matted is blasted at the same time, whereby the blasting material can hit the workpiece several times. Since the workpiece and the nozzle remain rigid to one another during the irradiation process, and the area performance of matting is determined by the relative speed between the workpiece and the particles of the abrasive material and not by the relative speed between the workpiece and the blasting chamber or nozzle, the result is a much higher one Area performance than with the methods and devices known from the prior art. For example, broken glass or particles of glass with a size of 150 μm, for example, can be used as radiation means. By specifying the irradiation time, particle size, particle speed, material, etc., various matting effects can be achieved.

In addition, in embodiments of the invention, the surface to be matted is roughened in the form of grooves, so that no craters result, as is the case with a jet of blasting medium oriented at an angle steeper than 60 °. The grooved roughening of the surface results in a more homogeneous matting at the micro level than with the blasting media jet that is oriented at a steeper angle than 60 °. At the macro level, the matted surfaces produced are equally homogeneous. In addition, aggressive media can run off or flow off better thanks to the groove-shaped structure. Overall, there is advantageously a higher chemical resistance of the matting produced.

By adapting the nozzle or blasting chamber to the workpiece to be matted, component handling can be designed very ergonomically. Since there are no moving parts of the system, the method according to the invention is very safe.

In an advantageous embodiment of the device, a relative speed between the particles of the abrasive material of the blasting medium jet can be used and determine an area performance of the irradiation process for the surface to be matted.

In a further advantageous embodiment of the device, a negative pressure generated in the blasting chamber can connect the at least one interaction opening to the at least one surface to be matted in a fluid-tight manner. A good connection between the at least one surface to be matted and the blasting chamber can be established in a simple manner by the negative pressure generated. In addition, the safety of the method can be increased by preventing the blasting process from starting if the workpiece is not correctly connected to the nozzle and no negative pressure can be generated in the blasting chamber.

In order to matt several workpieces or surfaces at the same time, the blasting chamber can have at least one interaction opening at least on an upper side and on a lower side, each of which can be covered by a surface to be matted. As a result, the irradiation can be carried out with a high degree of effectiveness and without wear to a wall of the blasting chamber or blasting nozzle. In the case of small surfaces to be matted, several interaction openings can be formed on the at least one side of the blasting chamber, each of which can be covered by a surface to be matted. This means that several small surfaces or workpieces can be matted at the same time.

In a further advantageous embodiment of the device, a nozzle contour which encloses the at least one interaction opening can be designed as a fixed support frame with a seal on which the workpiece with the surface to be matted rests. Alternatively, the nozzle contour can be designed as a flexible edge with a seal, which adapts to a contour of the workpiece in the area of the surface to be matted.

In a further advantageous embodiment of the method, the surface to be matted can be masked from abrasive material before the blasting with the blasting medium jet in order to cover areas not to be matted.

In this way, for example, optical effects, lettering, ornaments, shapes, etc. can be implemented. Here, the surface to be matted can be masked by means of a printing process or a film application. For individual matting, the surface to be matted is preferably masked by applying a film. In the case of series components, the surfaces to be matted are preferably masked by means of a printing process. Environmentally friendly, water-soluble peelable lacquer is preferably printed onto the surface to be matted as a mask. This masking can advantageously be washed off the matted surface in an environmentally friendly manner with water without chemical additives or with water with light chemical additives.

The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown on their own in the figures can be used not only in the respectively specified combination, but also in other combinations or on their own, without the scope of the Invention to leave. Thus, embodiments are also to be regarded as encompassed and disclosed by the invention, which are not explicitly shown or explained in the figures, but which emerge and can be generated from the explained embodiments by means of separate combinations of features.

Fig. 1

eine schematische Darstellung eines ersten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zum Mattieren einer Oberfläche;

Fig. 2

eine schematische Längsschnittdarstellung der erfindungsgemäßen Vorrichtung aus Fig. 1;

Fig. 3

eine schematische Darstellung eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zum Mattieren einer Oberfläche; und

Fig. 4

eine schematische Längsschnittdarstellung der erfindungsgemäßen Vorrichtung aus Fig. 3.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the description below. In the drawing, the same reference symbols designate components or elements that perform the same or analogous functions. Here show:

Fig. 1

a schematic representation of a first embodiment of a device according to the invention for matting a surface;

Fig. 2

a schematic longitudinal sectional view of the device according to the invention Fig. 1 ;

Fig. 3

a schematic representation of a second embodiment of a device according to the invention for matting a surface; and

Fig. 4

a schematic longitudinal sectional view of the device according to the invention Fig. 3 .

How out Figs. 1 to 4 As can be seen, the illustrated embodiments of the device 1, 1A, 1B according to the invention for matting a surface 12 each include a nozzle 3, 3A, 3B, which has a blasting chamber 4, 4A, 4B for irradiating a workpiece 10, 10A, 10B with an abrasive blasting material having. The blasting chamber 4, 4A, 4B has at least one flat interaction opening 5.2 on at least one of its sides, which is intended to be positively placed on at least one surface 12 to be matted, so that the blasting chamber 4, 4A, 4B is thereby closed.

Here, the workpiece and the nozzle remain rigid to one another during the irradiation process, whereby a direction of a blasting medium jet 9 made of abrasive material within the blasting chamber 4, 4A, 4B can be aligned approximately parallel to or at an angle of less than 30 ° to the interaction opening 5.2 and the surface 12 to be matted is.

In embodiments of the invention, a relative speed between the particles 8 of the abrasive material of the blasting medium jet 9 and the surface 12 to be matted determines an area performance of the irradiation process.

How out Figs. 1 to 4 As can also be seen, the device 1, 1A, 1B for matting a surface each comprises two blasting media connections 7, 7A, 7B, of which, depending on the blasting direction, a first blasting media connection 7, 7A, 7B as a feed 7.1 and a second blasting media connection 7, 7A , 7B acts as discharge 7.2. A transition area 6, 6A, 6B arranged. Depending on the beam direction, a first transition area 6, 6A, 6B acts as a distributor 6.1 for the planar blasting medium jet 9 and a second transition area 6, 6A, 6B acts as a collector 6.2. Here, the blasting agent connections 7, 7A, 7B can be connected to a hose and / or pipe system (not shown).

In the illustrated embodiments, a negative pressure is generated in the blasting chamber 4, 4A, 4B, which connects the interaction opening 5.2 in a fluid-tight manner to the surface 12 to be matted. In addition, the direction of the blasting medium jet 9 made of abrasive material is reversed.

How out Figs. 1 and 2 As can also be seen, a nozzle contour 5, which encloses the interaction opening 5.2, is designed in the illustrated first exemplary embodiment as a fixed support frame 5A with a seal 5.1. The workpiece 10A rests on this support frame 5A and the seal 5.1, so that the surface 12 to be matted covers the interaction opening 5.2. In addition, the shape and dimensions of the support frame 5A and the seal can be adapted to the shape and dimensions of the workpiece 10A. In the first exemplary embodiment shown, the workpiece 10A corresponds to an interior trim part. In the exemplary embodiment shown, the single interaction opening 5.2 of the blasting chamber 4A is arranged on its upper side. An underside of the blasting chamber 4A is covered by a wall, not designated. In an embodiment not shown, a second interaction opening 5.2 can be formed on the underside of the blasting chamber 4A, which can be covered by a further surface 12 to be matted in order to close the blasting chamber 4A. In a further exemplary embodiment, not shown, a plurality of interaction openings 5.2 are formed on at least one side of the blasting chamber 4A, each of which can be covered by a surface 12 to be matted.

How out Figs. 3 and 4 As can also be seen, the nozzle contour 5, which surrounds the interaction opening 5.2, is designed in the illustrated second exemplary embodiment as a flexible edge 5B with a seal 5.1. Here, the flexible edge 5B and the seal 5.1 adapt to a contour of the workpiece 10B in the area of the surface 12 to be matted. In the illustrated second embodiment, the workpiece 10B corresponds to a rocker on which an area is to be matted.

The inventive method for matting a surface 12 with the device 1, 1A, 1B described above comprises the following steps: providing a workpiece 10, 10A, 10B with a surface 12 to be matted, placing the device 1, 1A, 1B with its flat interaction opening 5.2 onto the area of the surface 12 to be matted, and irradiating the surface 12 with a jet of abrasive material 9 made of abrasive material in a first jet direction. In this case, the blasting medium jet 9 made of abrasive material is oriented approximately parallel to or at an angle of less than 30 ° to the interaction opening 5.2 and to the matting surface 12.

As has already been explained above, the relative speed between the particles 8 of the abrasive material of the blasting medium jet 9 and the surface 12 to be matted determines a surface output of the irradiation process.

In the exemplary embodiment shown, the surface 12 to be matted is also irradiated with a blasting medium jet 9 made of abrasive material in a second jet direction, the second jet direction running approximately in the opposite direction to the first jet direction. The alternating irradiation of the surface 12 with the blasting medium jet 9 made of abrasive material is repeated in the illustrated embodiment until a desired degree of matting of the surface 12 to be matted is reached.

To achieve certain matting effects, the surface 12 to be matted can be masked before the irradiation in order to cover areas not to be matted. The surface 12 of the workpieces 10, 10A, 10B to be matted can be used automatically for series parts by means of a printing process masked. In the case of individual workpieces 10, 10A, 10B, the surface 12 to be matted can be masked individually by applying a film. Environmentally friendly, water-soluble peelable lacquer is preferably printed onto the surface 12 to be matted as a mask. This masking can advantageously be washed off or removed from the matted surface 12 in an environmentally friendly manner with water without chemical additives or with water with slight chemical additives.

REFERENCE LIST

1, 1A, 1B

Device for matting surfaces

3, 3A, 3B

jet

4, 4A, 4B

Blasting chamber

5

Nozzle contour

5A

fixed support frame

5B

flexible edge

5.1

poetry

5.2

Interaction opening

6th

Transition area

6.1

Distributor

6.2

Collector

7, 7A, 7B

Abrasive connection

7.1

Feed

7.2

Discharge

8th

Particles

9

Blasting media jet

10, 10A, 10B

workpiece

12th

surface to be matted

Claims (12)

1. Device (1, 1A, 1B) for producing a matt surface (12), comprising a nozzle (3, 3A, 3B) which has a blasting chamber (4, 4A, 4B) for irradiating a workpiece (10, 10A, 10B) with an abrasive blasting material, the blasting chamber (4, 4A, 4B) having on at least one of its sides an at least one flat interaction opening (5.2) which is intended to be placed in a form-fitting manner on at least one surface (12) that is to be made matt, so that the blasting chamber (4, 4A, 4B) is thereby closed,

   wherein the workpiece (10, 10A, 10B) and the nozzle (3, 3A, 3B) remain rigid with respect to each other during the irradiation process, wherein a direction of an abrasive jet (9) of abrasive material within the blasting chamber (4, 4A, 4B) can be aligned approximately parallel to or at an angle of less than 30° with respect to the interaction opening (5.2) and the surface (12) that is to be made matt,

   characterised in that

   the jet direction of the abrasive jet (9) of abrasive material is reversible.
2. Device (1, 1A, 1B) according to claim 1, characterised in that a relative velocity between the particles (8) of the abrasive material of the abrasive jet (9) and the surface (12) that is to be made matt determines a surface power of the irradiation process.
3. Device (1, 1A, 1B) according to claim 1 or 2, characterised in that a reduced pressure generated in the blasting chamber (4, 4A, 4B) connects the at least one interaction opening (5.2) in a fluid-tight manner to the at least one surface (12) that is to be made matt.
4. Device (1, 1A, 1B) according to any one of claims 1 to 3, characterised in that the blasting chamber (4, 4A, 4B) has at least one interaction opening (5.2) at least on an upper side and on an underside, which interaction openings can each be covered by a surface (12) that is to be made matt.
5. Device (1, 1A, 1B) according to any one of claims 1 to 4, characterised in that the blasting chamber (4, 4A, 4B) has a plurality of interaction openings (5.2) on the at least one side, each of which are covered by a surface (12) that is to be made matt.
6. Device (1, 1A, 1B) according to any one of claims 1 to 5, characterised in that a nozzle shape (5), which surrounds the at least one interaction opening (5.2), is configured as a fixed support frame (5A) with a seal (5.1), on which the workpiece (10, 10A) with the surface (12) that is to be made matt rests.
7. Device (1, 1A, 1B) according to any one of claims 1 to 5, characterised in that a nozzle shape (5), which surrounds the at least one interaction opening (5.2), is configured as a flexible edge (5B) with a seal (5.1), which conforms to a shape of the workpiece (10, 10B) in the area of the surface (12) that is to be made matt.
8. Method for producing a matt surface (12) with a device (1, 1A, 1B), which is configured according to any one of claims 1 to 7, comprising the following steps:

   providing a workpiece (10, 10A, 10B) with a surface (12) that is to be made matt,

   placing the device (1, 1A, 1B) with its flat interaction opening (5.2) on the area of the surface (12) that is to be made matt,

   irradiating the surface (12) with an abrasive jet (9) of abrasive material in a first jet direction, the abrasive jet (9) of abrasive material being aligned approximately parallel to or at an angle of less than 30° to the interaction opening (5.2) and the surface (12) that is to be made matt,

   the irradiation of the surface (12) with the abrasive jet (9) of abrasive material being subsequently carried out in a second jet direction, the second jet direction extending in an approximately opposite direction to the first jet direction.
9. Method according to claim 8, characterised in that the alternating irradiation of the surface (12) with the abrasive jet (9) of abrasive material is repeated until the surface (12) has been made matt to a desired degree.
10. Method according to claim 8 or 9, characterised in that the surface (12) that is to be made matt is masked before irradiation with the abrasive jet (9) of abrasive material, in order to cover areas that are not to be made matt.
11. Method according to claim 10, characterised in that the surface (12) that is to be made matt is masked by means of a printing method or application of a film.
12. Method according to claim 10, characterised in that water-soluble peelable lacquer is printed as masking on the surface (12) that is to be made matt.

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