EP3578297A1 - Device and method for producing a matt surface - Google Patents

Abstract

The invention relates to a device (1, 1A) for matting a surface (12), with a nozzle (3, 3A) which has a blasting chamber (4, 4A) for irradiating a workpiece (10, 10A) with an abrasive radiation material, wherein the blasting chamber (4, 4A) 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) is thereby closed. According to the invention, the workpiece (10, 10A) and the nozzle (3, 3A) remain rigid to one another during the irradiation process, with a direction of a blasting medium jet (9) made of abrasive material within the blasting chamber (4, 4A) approximately parallel or at an angle smaller 30 ° to the interaction opening (5.2) and the surface to be matted (12) can be aligned.

Description

The invention relates to a device for matting a surface according to the preamble of 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 approximately cuboid jet nozzles or jet chambers. Here, a blasting agent beam is directed approximately perpendicular or at an angle significantly above 60 ° to 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 For example, a method for processing a glossy surface of a vehicle and / or a vehicle component is known, which is painted with a clearcoat layer of a given first layer thickness. In the method, a blasting medium is metered into a carrier air flow generated by negative pressure, conveyed in a hose line system to a jet lance and directed to a set by a blasting chamber under vacuum processing surface, then transported back into the air flow, cleaned and optionally circulated. In this case, the acceleration of the blasting agent is generated by the negative pressure and the blasting chamber on the processing surface, wherein the blasting agent at least one additional energy pulse through at least one further sucked by the vacuum, at least at atmospheric pressure gas flow to Achieving a lying well above the flow velocity of the carrier air flow end velocity upstream of a dosing is granted. The final velocity is used to set an energy input into the processing surface as a function of the type and shape of the processing surface and of the blasting medium, degree of carrier air stream loading, blasting medium carrier pressure, blasting time and blasting temperature, so that approximately 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 frosted and forms a reduced second layer thickness of the clearcoat film. To carry out the method, a generic device for matting surfaces is described.

A disadvantage can be considered in the known apparatus and methods for matting a surface, the long duration of the matting process for larger surfaces to be matted, since the area performance of matting results from the relative speed between the workpiece and nozzle or blasting chamber.

The invention is based on the object to provide a device and a method for matting a surface, which allow a higher area performance of matting.

This object is achieved by a device for matting a surface having the features of patent claim 1 and by a method for matting a surface having the features of patent claim 9. Advantageous embodiments with expedient developments of the invention are specified in the dependent claims.

In order to provide a device for matting a surface, which allows a higher surface performance of the matting, the workpiece and nozzle remain rigidly to each other during the irradiation process, wherein a direction of a abrasive jet of abrasive material within a Beam chamber in approximately parallel or at an angle less than 30 ° to the interaction opening and the surface to be matted is aligned.

A device for matting a surface is understood below to mean an assembly having a nozzle which has the blasting chamber for irradiating a workpiece with an abrasive radiation material. The blasting chamber has at least one planar interaction opening on at least one of its sides, which is intended to be placed in a form-fitting manner 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 planar interaction opening on the area of the surface to be matted, and irradiating the surface with a blasting medium beam of abrasive material in a first beam direction. Here, the abrasive jet of abrasive material is aligned approximately parallel or at an angle less than 30 ° to the interaction opening and the surface to be matted.

Embodiments of the invention enable a significantly higher area performance with otherwise identical beam parameters due to a "surface-shaped blasting". This means that at the same time the entire surface to be frosted is irradiated, whereby the blasting material can hit the workpiece several times. Since the workpiece and the nozzle during the irradiation process remain rigid to each other, and the surface 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 blasting chamber or nozzle, resulting in a much higher Area performance than in the known from the prior art methods and devices. For example, glass breakage or particles of glass with a size of, for example, 150 μm can be used as the radiation means become. By specifying irradiation time, particle size, particle velocity, material, etc., different matting effects can be achieved.

In addition, the surfaces to be matted in embodiments of the invention are roughened grooved, so that no craters arise as in a beam angle with a steeper angle than 60 ° aligned. The groove-like roughening of the surface results in a more homogeneous matting on the micro level than in the beam medium beam aligned at a steeper angle than 60 °. At the macro level, the matt surfaces produced are homogeneous. In addition, aggressive media can run better through the groove-shaped structure or drain. Overall, a higher chemical resistance of the matting produced results in an advantageous manner.

By adapting the nozzle or blasting chamber to the workpiece to be matted, the component handling can be made very ergonomic. Since no moving parts of the system are present, 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 agent jet and the surface to be matted can determine a surface power of the irradiation process.

In a further advantageous embodiment of the device, a negative pressure generated in the blasting chamber can connect the at least one interaction opening in a fluid-tight manner to the at least one surface to be matted. Due to the generated negative pressure, a good connection between the at least one surface to be matted and the blasting chamber can be produced in a simple manner. In addition, the safety of the method can be increased, in that starting the blasting process is prevented when the workpiece is not properly 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 an underside, which can each be covered by a surface to be matted. As a result, the irradiation can be carried out with high efficiency and without wear of a wall of the blasting chamber or blasting nozzle. If there are small surfaces to be matted, a plurality of interaction openings can be formed on the at least one side of the blasting chamber, which can each be covered by a surface to be matted. As a result, several small surfaces or workpieces can be matted at the same time.

In a further advantageous embodiment of the device, the jet direction of the abrasive jet of abrasive material can be reversed. By alternately irradiating the surface to be matted in opposite beam directions, the result of the matting can be further improved.

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

In an advantageous embodiment of the method, the irradiation of the surface can be carried out with a jet stream of abrasive material in a second beam direction, which runs approximately opposite to the first beam direction. Furthermore, the alternate irradiation of the surface with the abrasive jet of abrasive material may be repeated until a desired degree of matting of the surface to be matted is achieved.

In a further advantageous embodiment of the method, the surface to be matted can be masked before the irradiation with the blasting agent beam of abrasive material in order to cover areas not to be matted. As a result, for example, optical effects, logos, ornaments, shapes, etc. can be implemented. In this case, 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 means of foil application. For serial components, the surfaces to be matted are preferably masked by means of a printing process. Preferably, environmentally friendly water-soluble stripping is printed as a masking on the surface to be matted. This masking can be washed off in an environmentally friendly way with water without chemical additives or with water with light chemical additives again from the frosted surface.

The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention. Thus, embodiments are also included and disclosed by the invention, which are not explicitly shown or explained in the figures, however, emerge and can be produced by separated combinations of features from the embodiments explained.

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.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. In the drawing, like reference numerals designate components that perform the same or analog functions. Hereby 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 Fig. 1 to 4 1, 1A, 1B for matting a surface 12 each comprise a nozzle 3, 3A, 3B, which comprises a blasting chamber 4, 4A, 4B for irradiating a workpiece 10, 10A, 10B with an abrasive radiation material having. The blasting chamber 4, 4A, 4B has on at least one of its sides at least one planar interaction opening 5.2, which is intended to be positively placed on at least one surface 12 to be frosted, so that the blasting chamber 4, 4A, 4B is thereby closed.

According to the invention, the workpiece and the nozzle during the irradiation process remain rigidly to each other, wherein a direction of a Strahlmittelstrahls 9 of abrasive material within the blasting chamber 4, 4A, 4B approximately parallel or at an angle less than 30 ° to the interaction opening 5.2 and the surface to be matted 12 aligned is.

In embodiments of the invention, a relative velocity between the particles 8 of the abrasive material of the abrasive jet 9 and the surface 12 to be matted determines a surface power of the irradiation process.

How out Fig. 1 to 4 2, the apparatus 1, 1A, 1B for matting a surface comprises in each case two blasting agent connections 7, 7A, 7B, of which a first one depends on the beam direction Blasting agent connection 7, 7A, 7B as a supply 7.1 and a second blasting agent connection 7, 7A, 7B acts as discharge 7.2. Between the blasting agent connections 7, 7A, 7B and the blasting chamber 4, 4A, 4B, a transitional area 6, 6A, 6B is arranged in each case. Depending on the beam direction, a first transition region 6, 6A, 6B acts as a distributor 6.1 of the flat abrasive jet 9 and a second transition region 6, 6A, 6B 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 fluid-tightly connects the interaction opening 5.2 with the surface 12 to be matted. In addition, the jet direction of the abrasive jet 9 can be reversed from abrasive material.

How out Fig. 1 and 2 is further apparent, a nozzle contour 5, which encloses the interaction opening 5.2, formed in the illustrated first embodiment as a fixed support frame 5A with a seal 5.1. The workpiece 10A rests on this support name 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 gasket can be adapted to the shape and dimensions of the workpiece 10A. In the illustrated first embodiment, the workpiece 10A corresponds to an interior trim part. In the illustrated embodiment, the single interaction opening 5.2 of the blasting chamber 4A is arranged at the top thereof. An underside of the blasting chamber 4A is covered by an unmarked wall. 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 another surface 12 to be matted to close the blasting chamber 4A. In a further embodiment, not shown, a plurality of interaction openings 5.2 are formed on at least one side of the blasting chamber 4A, which are each covered by a surface 12 to be frosted.

How out 3 and 4 is further apparent, the nozzle contour 5, which encloses the interaction opening 5.2, formed in the illustrated second embodiment as a flexible edge 5B with a seal 5.1. In this case, the flexible edge 5B and the seal 5.1 adapts to a contour of the workpiece 10B in the region of the surface 12 to be matted. In the illustrated second embodiment, the workpiece 10B corresponds to a sill, on which an area is to be matted.

The method according to the invention 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 planar interaction opening 5.2 on the area to be matted of the surface 12, and irradiation of the surface 12 with a blasting material jet 9 of abrasive material in a first beam direction. In this case, the blasting agent jet 9 of abrasive material is aligned approximately parallel or at an angle of less than 30 ° to the interaction opening 5.2 and to the matting surface 12.

As already 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 power of the irradiation process.

In the illustrated embodiment, the irradiation of the surface 12 to be matted is additionally carried out with a blasting medium jet 9 of abrasive material in a second beam direction, wherein the second beam direction is approximately opposite to the first beam direction. The alternate irradiation of the surface 12 with the abrasive jet 9 of abrasive material is repeated in the illustrated embodiment until a desired degree of matting of the surface 12 to be matted is reached. Alternatively, the irradiation of the surface 12 to be matted can take place only in one beam direction and be carried out until the desired matting effect is achieved.

In order to achieve certain matting effects, the surface 12 to be matted may be masked before irradiation in order to cover areas which are not to be matted. The surface 12 to be matted of the workpieces 10, 10A, 10B can be automatically masked for series parts by means of a printing process. For individual workpieces 10, 10A, 10B, the surface 12 to be matted can be masked individually by applying a film. Preferably environmentally friendly water-soluble strippable is printed as a masking on the surface 12 to be matted. This masking can be washed off or removed from the matted surface 12 in an environmentally friendly way with water without chemical additives or with water with light chemical additives.

LIST OF REFERENCE NUMBERS

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

6

Transition area

6.1

distributor

6.2

collector

7, 7A, 7B

Blasting agent connection

7.1

feed

7.2

removal

8th

particle

9

Blasting abrasive jet

10, 10A, 10B

workpiece

12

surface to be matted

Claims (14)

Apparatus (1, 1A, 1B) for matting a surface (12), comprising a nozzle (3, 3A, 3B), which has a blasting chamber (4, 4A, 4B) for irradiating a workpiece (10, 10A, 10B) with a has abrasive radiation material, wherein the blasting chamber (4, 4A, 4B) on at least one of its sides at least one planar interaction opening (5.2), which is intended to be positively placed on at least one surface to be frosted (12), so that the blasting chamber (4, 4A, 4B) is thereby closed,
characterized in that
the workpiece (10, 10A, 10B) and the nozzle (3, 3A, 3B) remain rigid with each other during the irradiation process, with a direction of abrasive media (9) of abrasive material within the blasting chamber (4, 4A, 4B) being approximately parallel or at an angle smaller than 30 ° to the interaction opening (5.2) and the surface to be matted (12) is alignable. Device (1, 1A, 1B) according to claim 1, characterized in that a relative speed between the particles (8) of the abrasive material of the blasting agent jet (9) and the surface to be matted (12) determines a surface power of the irradiation process. Device (1, 1A, 1B) according to claim 1 or 2, characterized in that in the blasting chamber (4, 4A, 4B) generated negative pressure fluidly connects the at least one interaction opening (5.2) with the at least one surface to be frosted (12) , Device (1, 1A, 1B) according to one of claims 1 to 3, characterized in that the jet direction of the blasting medium jet (9) is reversible of abrasive material. Device (1, 1A, 1B) according to one of claims 1 to 4, characterized in that the blasting chamber (4, 4A, 4B) at least at one Has at least one upper side and at least one interaction opening (5.2), which in each case can be covered by a surface to be matted (12). Device (1, 1A, 1B) according to one of claims 1 to 5, characterized in that the blasting chamber (4, 4A, 4B) has on the at least one side a plurality of interaction openings (5.2), each of which is to be matted surface (12 ) are covered. Device (1, 1A, 1B) according to one of claims 1 to 6, characterized in that a nozzle contour (5) which encloses the at least one interaction opening (5.2), as a fixed support frame (5A) with a seal (5.1) is formed on which the workpiece (10, 10A) rests with the surface (12) to be matted. Device (1, 1A, 1B) according to one of claims 1 to 6, characterized in that a nozzle contour (5), which encloses the at least one interaction opening (5.2), as a flexible edge (5B) with a seal (5.1) is formed which adapts to a contour of the workpiece (10, 10B) in the region of the surface (12) to be matted. A method of matting a surface (12) with a device (1, 1A, 1B) formed according to any one of claims 1 to 8, comprising the steps of: Providing a workpiece (10, 10A, 10B) having a surface (12) to be matted, Placing the device (1, 1A, 1B) with its planar interaction opening (5.2) on the area of the surface (12) to be frosted, Irradiation of the surface (12) with a blasting material jet (9) of abrasive material in a first beam direction, wherein the blasting abrasive jet (9) of abrasive material approximately parallel or at an angle less than 30 ° to the interaction opening (5.2) and the surface to be frosted ( 12) is aligned. A method according to claim 9, characterized in that the irradiation of the surface (12) with the abrasive jet (9) is carried out of abrasive material in a second beam direction, wherein the second beam direction is approximately opposite to the first beam direction. A method according to claim 10, characterized in that the alternating irradiation of the surface (12) with the abrasive jet (9) of abrasive material is repeated until a desired degree of matting of the surface to be matted (12) is reached. Method according to one of Claims 9 to 11, characterized in that the surface (12) to be matted is masked from abrasive material prior to irradiation with the blasting agent jet (9) in order to cover areas which are not to be matted. A method according to claim 12, characterized in that the surface to be matted (12) is masked by means of a printing process or a foil application. A method according to claim 14, characterized in that water-soluble Abziehlack is printed as a masking on the surface to be matted (12).

Images