METHOD FOR CAPTURING A COATING OF A COMPONENT, IN PARTICULAR OF A MACHINE, THE COATING BEING FORMED FROM A FIRST MATERIAL

Abstract

A method for capturing a coating of a component, which component has at least one first subregion and at least one second subregion, which adjoins the first subregion and in which the main body is free of the coating, wherein: first electromagnetic radiation reflected by the first subregion of the component and second electromagnetic radiation reflected by the second subregion of the component are sensed by a detection device; first data, which characterize the first electromagnetic radiation, and second data, which characterize the second electromagnetic radiation, are produced; a virtual, three-dimensional model of the component is produced in dependence on the data.

Claims

1. A method for capturing a coating, formed from a first material, of a component which comprises at least one first subregion in which a base body, formed from a second material different to the first material, of the component is provided with the coating, and at least one second subregion, adjacent to the first subregion, in which the base body is free of the coating, the method comprising: capturing a first electromagnetic radiation reflected by the first subregion of the component and a second electromagnetic radiation reflected by the second subregion of the component by a detection device; generating first data, which characterize the first electromagnetic radiation and the first subregion, and second data, which characterize the second electromagnetic radiation and the second subregion; generating a virtual three-dimensional model of the component as a function of the data, in such a way that the virtual model comprises a virtual first region corresponding to the first subregion and a virtual second region corresponding to the second subregion.

2. The method as claimed in claim 1, further comprising: displaying the virtual model at least partially by an electronic display device in such a way that the virtual first region of the model, corresponding to the first subregion, and the virtual second region of the virtual model, corresponding to the second subregion, are displayed in different types of way to one another, which are visually perceptible with the human eye.

3. The method as claimed in claim 2, wherein the virtual model is displayed on an electronic screen.

4. The method as claimed in claim 2, wherein the display device is configured to be worn on a head of a person so that at least one of the regions of the virtual model is represented in a way which can be seen by at least one eye of the person by a display element of the display device.

5. The method as claimed in claim 1, further comprising: projecting at least one of the regions of the virtual model by at least one projector device directly onto the subregion, corresponding to the region, of the component.

6. The method as claimed in claim 1, wherein the data are determined by machine vision.

7. The method as claimed in claim 1, wherein a blade for a fluid energy machine is used as the component and/or the second material comprises cobalt.

8. The method as claimed in claim 1, wherein the first material comprises a ceramic and/or an adhesion promoter and/or MCrAlY.

9. The method as claimed in claim 1, wherein the electromagnetic radiations are captured by at least one hyperspectral recording.

10. The method as claimed in claim 1, wherein at least one tool path for a tool for processing the component is compiled with the aid of the virtual model.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In this case, the single FIGURE shows a schematic flowchart of a method for capturing a coating, formed from a first material, of a component.

DETAILED DESCRIPTION OF INVENTION

[0040] In the single FIGURE, there is a schematic flowchart of a method for capturing a coating 12, formed from a first material, of a component 10, in particular of a machine, for example of a fluid energy machine, which comprises at least one first subregion 14, in which a base body, formed from a second material different to the first material, of the component 10 is provided with the coating 12, and at least one second subregion 16, adjacent to the first subregion 14, in which the base body of the component 10 is free of the coating 12.

[0041] In order now to be able to perform the method particularly advantageously, so that the coating 12, for example in a refurbishment process or in reconditioning of a component 10 configured as blade for the fluid energy machine, may be removed particularly advantageously, the method comprises a plurality of steps:

[0042] In a first step S1, a first electromagnetic radiation 20 reflected by the first subregion 14 of the component 10 and a second electromagnetic radiation 20 reflected by the second subregion 16 of the component 10 are captured by means of a detection device 18. In this case, the first electromagnetic radiation 20 has for example at least one first wavelength. Furthermore, the second electromagnetic radiation 20 has at least one second wavelength different to the first wavelength. In a second step S2 of the method, first data 22, which characterize the first electromagnetic radiation 20 and the first subregion 14, and second data 24, which characterize the second electromagnetic radiation 20 and the second subregion 16, are generated. In this case, the data 22, 24 may in particular be determined advantageously by machine vision, in particular by a computer vision routine. In this case, for example, as an intermediate stage a false color, for example of the electromagnetic radiation 20 captured in particular in a hyperspectral recording, is processed, to which end the detection device 18 is advantageously configured as a hyperspectral recording device.

[0043] Thus, in the second step S2, for example, a false-color image is produced with maximum contrast between the second material, i.e. the base material of the component 10, and the first material, i.e. the coating 12 of the component 10. From this, for example, in particular by tonal separation, an in particular binary mask may be compiled which is projected later in a step S3 of the method for example onto a CAD (computer-aided design) model 26.

[0044] In the third step S3, a virtual three-dimensional model 28 of the component 10 is generated as a function of the data 22, 24, in such a way that the virtual model 28 comprises a virtual region 30 corresponding to the first subregion 14 and a virtual second subregion 32 corresponding to the second subregion 16.

[0045] In other words, the method is based on a combination of a digitized imaging method, for example the generation of a hyperspectral recording by the detection device 18, with an in particular mathematically based computer vision routine, which can be carried out by machine vision in step S2 of the method. In this case, the virtual three-dimensional model 28 of the component 10 may be represented by means of the method in a visual type of way, for example on a display apparatus. To this end, the virtual model 28 is advantageously displayed at least partially by means of the electronic display device, in such a way that the virtual first region 30, corresponding to the first subregion 14, of the model 28 is displayed in a first type of way, and the virtual second region 32, corresponding to the second subregion 16, of the virtual model is displayed in a second type of way different from the first type of way, and therefore in different types of way to one another, which are visually perceptible with the human eye.

[0046] Thus, in summary, a digital recording, in particular a hyperspectral recording, of the component 10 is generated by means of the detection device 18 in step S1 of the method by an imaging method, for example hyperspectral imaging, so as to allow clear discrimination between the base material, i.e. the second material, and the coating 12, i.e. the first material. Preferably, the method, or the compilation of the recording, is carried out from different viewing directions in order to capture a component surface of the component 10 as a whole. In step S2 of the method, the compilation of the data 22 and 24 is then carried out, so that the coating and the base body of the component 10 can be captured separately from one another in the model 28. This is done, for example, by means of the aforementioned mask.

[0047] In the third step S3 of the method, an inverse projection of the mask onto the CAD model 26 may then be carried out, in which case a projection may be carried out from the in particular two-dimensional hyperspectral recording, or the two-dimensional data 22, 24, onto the CAD model 26, in particular onto the three-dimensional surface thereof. In this way, for each image point of the data 22 and 24, a corresponding value thereof, i.e. the type of representation, for example in the form of a color or a texture, may be stored for the data of the CAD model 26, so that it is now possible to relocate from the previous 2D data 22 and 24 in the visible three-dimensional surface of the CAD model 26, so that the model 28 can be generated.

[0048] The inverse projection leads so to speak to a data fusion of geometrical configuration description, i.e. of the CAD model 26 and pictorially captured surface properties, which have been captured in step S1 by the detection device 18. Thus, for example, false-color representation leads to a region association which shows whether or not a point of the CAD model is coated with the coating, advantageously by means of texturing for the CAD model 26 in the model 28.

[0049] If, for example, a plurality of hyperspectral recordings of the component 10, or images of the component 10, or of the workpiece, are captured, each image or each hyperspectral recording provides a texture fragment for the surface of the component. Preferably, the fragments are recorded by the detection device 18 in such a way that they overlap for example at their edges so as to obtain a complete texture layer, in particular for the part of the workpiece, or of the workpiece surface, and therefore of the component 10, that is of interest to a technician for finishing of the component 10.

[0050] The display apparatus may, as mentioned, for example be an electronic screen. Advantageously, the display device and/or a further display device is in addition or as an alternative configured to be worn on a person's head so that at least one of the regions of the virtual model 28 can be represented in a way which is visible to at least one of the person's eyes by means of a display element of the display device. In this case, the display apparatus to be worn on the head may for example be smart glasses or a head-mounted display, which depending on the type of representation is suitable for presenting the technician with the full virtual model 28 in a virtual space, or for displaying the first region 30 and/or the second region 32 directly on the component 10 in a superimposed image with the actual component 10 by using augmented reality.

[0051] In addition or as an alternative, a projector device which optically projects precisely the regions 30, 32 of the virtual model 28 directly on the subregion 14 or 16, corresponding to the region, of the component 10 may be used for displaying the model 28 or at least partially displaying the model 28, i.e. for example displaying the region 30 or 32. This is advantageously possible in particular when the component 10 is a blade, in particular a rotor blade, guide vane and/or inlet blade, for a fluid energy machine, for example a gas turbine or an engine.

[0052] Preferably, the second material comprises cobalt, so that for example the second material may be captured particularly advantageously because of its reflection behavior in an alloy carried out as per steps S1 to S3.

[0053] Advantageously, the first material comprises a ceramic and/or an adhesion promoter and/or a metallic compound with chromium-aluminum-yttrium (MCrAlY). If the material comprises one of the aforementioned constituents, it may be used particularly advantageously as a coating for a component 10 configured as a blade as a fluid energy machine, so that the method is found to be particularly advantageous precisely for the refurbishing of turbines, or fluid energy machines, in particular for the heat resistance of the component 10 thereof, so that time and/or costs may particularly advantageously be saved.

[0054] By the proposed method, which may be used as an imaging measurement method for the chemical composition of the workpiece surface of the component 10, it is particularly advantageously possible to replace for example the so-called heat-tint, which colors the actual surface of the component 10 by strong heating with particularly high energy and time consumption. This also leads to the advantage that the surface of the component 10 is not modified by the proposed method, that is to say there is no color change, which may for example be desirable.

[0055] Thus, a technician may particularly advantageously finish the component 10 by the method. Furthermore, a tool path, for example for a grinding or blasting tool, could for example also advantageously be determined from the compiled model 28, so that in the future, for example, the finishing of the component 10, in particular the removal of the coating 12, may be carried out fully automatically. By the proposed method, the model 28, which may as a digital twin lead an interface to a multiplicity of types of digital use of the data 22, 24, is created.

LIST OF REFERENCES

[0056] 10 component [0057] 12 coating [0058] 14 first subregion [0059] 16 second subregion [0060] 18 detection device [0061] 20 electromagnetic radiation [0062] 22 first data [0063] 24 second data [0064] 26 CAD model [0065] 28 virtual model [0066] 30 first region [0067] 32 second region [0068] S1 first step [0069] S2 second step [0070] S3 third step